CN111426910A - Testing system and testing method for flexible direct current transmission converter station - Google Patents
Testing system and testing method for flexible direct current transmission converter station Download PDFInfo
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Abstract
The application provides a test system and a test method for a flexible direct current transmission converter station. The test system comprises: a station transformer; a test power supply on a test site is connected to a low-voltage winding of the station transformer through a low-voltage alternating-current switch; a first winding of the connecting transformer is connected with a high-voltage winding of the station transformer; the converter valve and the direct current field equipment are connected to the second winding of the connecting transformer; and the resistor component is connected between a low-voltage winding of the station transformer and the test power supply, or between a high-voltage winding of the station transformer and a first winding of the connecting transformer, or between a second winding of the connecting transformer and the converter valve and the direct-current field equipment. The test system fully utilizes the existing main equipment of the offshore converter station, and the high-voltage test of the offshore converter station can be completed by utilizing the low-voltage incoming line of the onshore installation test site without additionally building a test platform.
Description
Technical Field
The application relates to the technical field of flexible direct current transmission of a power system, in particular to a test system and a test method of a flexible direct current transmission converter station.
Background
In order to solve the problem of global warming caused by the increase of carbon emission, new energy power generation is increasingly paid attention and favored by governments of various countries as a green energy source. Wind power generation is an important new energy source. Compared with onshore wind power, offshore wind power has the advantages of no land resource occupation, more stable wind resource, higher utilization hour and the like. Offshore wind power development is being carried out on a large scale in major countries of the world.
In offshore wind power resources, offshore wind power resources are wider and more stable. In order to obtain more offshore wind energy resources, offshore wind farms are gradually developing in the direction of deep open sea. When the distance between the wind power plant and the shore exceeds 60km and the wind power plant enters a generalized open sea area, the cost performance of the wind power alternating current output mode gradually loses along with the improvement of electric energy loss, reactive compensation difficulty and overall manufacturing cost, and the direct current transmission mode becomes an optimal option.
The flexible direct current transmission has the characteristic of rapid and controllable active and reactive power, and is particularly suitable for offshore wind power new energy transmission. The flexible direct current transmission converter station is a main device in flexible direct current transmission. When the flexible direct current transmission converter station is applied to an offshore wind farm, the flexible direct current transmission converter station is usually built on an offshore platform. The entire offshore platform typically includes a main equipment space and a crew space. The offshore platform is narrow and narrow in space and smaller than a football field, so that the debugging work of the flexible direct current transmission converter station is very difficult on the sea, and the problems of long test period, inconvenient supply of living goods and materials and the like exist. Therefore, the main equipment of the offshore converter station needs to be shipped to offshore installation after completing the full test on land to reduce the working time on the sea.
Disclosure of Invention
The application aims at providing a test system of flexible direct current transmission current conversion station, each existing main equipment of offshore current conversion station is fully utilized, the high-voltage test of the offshore current conversion station can be completed by utilizing the low-voltage incoming line of the onshore installation test site, and a test platform is not required to be additionally built.
According to an aspect of the application, a testing system for a flexible direct current transmission converter station is provided, which includes:
a station transformer;
a test power supply on a test site is connected to a low-voltage winding of the station transformer through a low-voltage alternating-current switch;
a first winding of the connecting transformer is connected with a high-voltage winding of the station transformer;
the converter valve and the direct current field equipment are connected to the second winding of the connecting transformer;
and the resistor component is connected between a low-voltage winding of the station transformer and the test power supply, or between a high-voltage winding of the station transformer and a first winding of the connecting transformer, or between a second winding of the connecting transformer and the converter valve and the direct-current field equipment.
According to some embodiments of the application, the flexible direct current transmission converter station is used as an offshore flexible direct current transmission converter station.
According to some embodiments of the present application, a voltage level of the test power supply matches a voltage level of a low voltage winding of the station transformer.
According to some embodiments of the present application, the test power supply comprises:
the testing system is located at the current or boosted one of a 10kV power supply, a 20kV power supply, a 35kV power supply and a 110kV power supply.
According to some embodiments of the application, the resistor assembly comprises: a resistor; a resistor parallel switch in parallel with the resistor.
According to some embodiments of the application, the resistor assembly is connected between the high voltage winding of the station transformer and the first winding of the coupling transformer, the resistor assembly being arranged before or after the ac busbar, the resistor having a resistance value in the range of 50-20000 ohms.
According to some embodiments of the application, the resistor assembly is connected between a low voltage winding of the station transformer and the test power supply, and the resistor assembly is disposed before or after the low voltage ac switch and has a resistance value in a range of 5-2000 ohms.
According to some embodiments of the application, the first winding of the coupling transformer is connected to the high voltage winding of the station transformer by an ac bus.
According to some embodiments of the application, the ac bus comprises a bus with or without an ac switch.
According to some embodiments of the application, the manner in which the ac busbar accesses the first winding of the coupling transformer comprises:
3/2 wiring or double bus wiring.
According to some embodiments of the application, the converter valve and the dc field device are switched in the second winding of the coupling transformer through a valve side bus.
Further, the valve side bus bar includes a bus bar with a valve side switch or a bus bar without a valve side switch.
According to some embodiments of the application, the assay system further comprises:
and the grounding device is arranged between the second winding of the connecting transformer and the converter valve and the direct current field equipment.
Further, the grounding method adopted by the grounding device comprises the following steps: small capacitance grounding or star reactance plus resistance grounding.
According to some embodiments of the application, the station comprises a primary device of the testing system with a transformer, an ac bus, a coupling transformer, a valve side switch, a valve side bus, a converter valve, and a dc field device and a resistor assembly, the testing system further comprising:
and the secondary equipment is correspondingly connected with the primary equipment and is used for measuring or controlling the primary equipment.
According to another aspect of the present application, there is provided a testing method for a flexible direct current transmission converter station, which is applied to the testing system, and includes:
monitoring the readiness of primary and secondary equipment in the test system;
an AC switch that closes the AC bus and the valve side switch;
closing the low-voltage alternating-current switch to charge the primary equipment;
after a period of time delay after charging, closing the resistor parallel switch, and further charging the converter valve and the direct current field equipment;
performing the primary equipment and secondary equipment tests;
and disconnecting the valve side switch or the alternating current switch of the alternating current bus or the low-voltage alternating current switch to perform a passive inversion test.
According to some embodiments of the application, the period of delay is in the range of 5s-500 s.
According to some embodiments of the application, the method further comprises: and carrying out active charging test on the converter valve and the direct current field equipment.
The application provides a flexible direct current transmission converter station's test system directly utilizes each main equipment that marine converter station used when buildding on the offshore platform to test, does not need extra equipment or removes current position. After the test is finished, the test can be directly transported to the sea. Except the alternating current switch, the resistor and the parallel switch connected with the resistor, the test platform is not required to be built in an additional test field. On the other hand, the test system provided by the application completes the high-voltage test of the main equipment of the convertor station by utilizing the 10kV low-voltage incoming line of the onshore installation test site of the offshore convertor station. Through tests, not only are a system loop and main equipment verified, but also the wiring and control functions of a converter station control system and main equipment are verified, the problems are solved on the land, and the offshore debugging time, the engineering debugging period and the cost are reduced. In addition, placing the test power supply at the low voltage end of the incoming line reduces the requirement for test power supply capacity by connecting resistor components in series in the loop.
Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is apparent that the drawings in the following description are only some embodiments of the present application.
Fig. 1 shows a schematic composition diagram of an offshore wind power output direct current system according to an exemplary embodiment of the present application.
Fig. 2 shows a schematic diagram of a test system composition of a flexible direct current transmission converter station according to a first example embodiment of the present application.
Fig. 3 shows a schematic diagram of a test system composition of a flexible direct current transmission converter station according to a second example embodiment of the present application.
Fig. 4 shows a schematic diagram of a test system composition of a flexible direct current transmission converter station according to a third example embodiment of the present application.
Fig. 5 shows a schematic diagram of a test system composition of a flexible direct current transmission converter station according to a fourth example embodiment of the present application.
Fig. 6 shows a flow chart of a method of testing a flexible direct current transmission converter station according to an example embodiment of the present application.
Detailed Description
Example embodiments will now be described more fully hereinafter with reference to the accompanying drawings. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of example embodiments to those skilled in the art. The same reference numerals denote the same or similar parts in the drawings, and thus, a repetitive description thereof will be omitted.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
It will be understood that, although the terms first, second, etc. may be used herein to describe various components, these components should not be limited by these terms. These terms are used to distinguish one element from another. Thus, a first component discussed below may be termed a second component without departing from the teachings of the present concepts. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Those skilled in the art will appreciate that the drawings are merely schematic representations of exemplary embodiments, which may not be to scale. The blocks or flows in the drawings are not necessarily required to practice the present application and therefore should not be used to limit the scope of the present application.
In the existing offshore flexible direct current transmission converter station test scheme, it is generally adopted that the test of the related equipment of the offshore flexible direct current transmission converter station is carried out on an installation test site on land, such as a dock. The inventor finds that the test of the offshore flexible direct current transmission converter station in the existing onshore installation test site has the following problems:
on one hand, offshore wind power flexible direct current transmission projects are generally open-sea high-voltage large-capacity projects, and the voltage of a connected alternating current power grid is generally 220 kV. A test power supply for constructing and installing a test site on land is usually a 10kV or 35kV incoming line, and cannot match the high voltage required by the test of the offshore flexible direct current transmission converter station. In order to meet the high voltage requirement, the prior art adopts a method of additionally building a test circuit to provide a high voltage power supply. The space required for additional test circuits is limited by the test environment of the dock, etc. For example, patent CN103033701 proposes a testing device, which is a rectifying circuit and includes a transformer required by the rectifying circuit, and the testing device needs to occupy a certain space and needs a large testing power source capacity.
On the other hand, the onshore construction and installation test site does not generally have a large-capacity test power supply, and the test requirements of the offshore flexible direct-current transmission converter station are difficult to meet.
In addition, the existing test scheme of the onshore construction and installation test site can only test each device independently, but can not test the system integrally.
Aiming at the technical problems of the existing test scheme of building and installing a test site on land, the inventor provides a test system and a test method of a flexible direct current transmission converter station, and a test circuit does not need to be additionally built, so that the high-voltage requirement of the test can be met, and the requirement on the power supply capacity can be reduced.
Fig. 1 shows a schematic composition diagram of an offshore wind power output direct current system according to an exemplary embodiment of the present application.
As shown in fig. 1, an offshore wind power output dc system 1000 generally includes an ac booster station 100, an offshore flexible dc transmission converter station 200 (hereinafter referred to as an offshore converter station), and an onshore converter station 300. The electricity generated by the offshore wind farm is boosted by the ac booster station 100 and then connected to the offshore converter station 200. The direct current is output through the offshore converter station 200 and is connected to the onshore converter station 300 through the sea cable 400, so that the power of the wind farm is transmitted from the offshore to the onshore alternating current power grid 500.
Referring to fig. 1, an offshore converter station 200 generally comprises: ac busbar 210, station transformer 220, coupling transformer 230, valve-side busbar 240, valve-side switch 250 (not shown), converter valves and dc field devices 260 and corresponding measurement or control devices. The converter valves and dc field devices 260 typically include converter valves, bridge arm reactors, dc field devices, and the like.
In the power transmission process, wind power generated by an offshore wind farm is boosted and then connected to the alternating current bus 210 of the offshore converter station 200. Ac bus 210 is connected to valve side bus 240 by two sets of parallel coupling transformers 230. The valve side bus 240 is connected to the ac side of the converter valve and dc field device 260. The offshore converter station 200 supplies power to other equipment of the offshore converter station, such as an air conditioning system, through the high voltage station power transformer 220.
Fig. 2 shows a schematic diagram of a test system composition of a flexible direct current transmission converter station according to a first example embodiment of the present application.
As shown in fig. 2, according to an example embodiment, the testing system 2000 of the flexible dc transmission converter station provided by the present application comprises: a test power supply 2100, a low voltage ac switch 2200, a station transformer 220, a link transformer 230 and a converter valve and dc field device 260. To reduce testing power losses to the test site, a single link transformer is included in the test system 2000. The converter valves and dc field devices 260 generally comprise converter valves 261, bridge arm reactors 262, dc field devices 261 and corresponding measuring or control devices.
Referring to fig. 2, in the test system 2000, a test power supply 2100 at a test site is connected to the low-voltage winding of the station transformer 220 through a low-voltage ac switch 2200. The first winding of the coupling transformer 230 may be connected directly to the high voltage winding of the station transformer 220 or may be connected to the high voltage winding of the station transformer 220 via the ac bus 210. In an example embodiment of the present application, a first winding of the coupling transformer 230 taps into a high voltage winding of the station transformer 220 via the ac bus 210. According to an example embodiment of the present application, ac bus 210 is a bus with ac switch 211. In other embodiments, ac bus 210 may also be a bus without an ac switch.
The converter valves and dc field devices 260 may be directly connected to the second winding of the coupling transformer 230 or may be connected to the second winding of the coupling transformer 230 via a valve-side bus 240. As shown in fig. 2, in an example embodiment of the present application, the converter valve and dc field device 260 is connected to the second winding of the coupling transformer 230 through a valve-side bus 240. Valve side bus 240 may be a bus with valve side switch 250 or a bus without valve side switch 250. In the example embodiment of the present application, valve side bus 240 is a bus with valve side switch 250. Specifically, valve side switch 250 taps into the second winding of the coupling transformer 230. Valve side bus 240 connects valve side switch 250. The converter valve and dc field device 260 is connected to the valve side bus 240. According to the embodiment of the present application, the connection between the ac busbar 210 and the coupling transformer 230 may be either 3/2 wiring or double busbar wiring.
According to an embodiment of the present application, the voltage level of the test power supply 2100 is matched to the voltage level of the low voltage winding of the station transformer 220 to provide a suitable test power supply for the test system. The test power supply 2100 comprises one of a 10kV power supply, a 20kV power supply, a 35kV power supply, and a 110kV power supply, which are either present or boosted at the site of the test system 2000. For example, other power sources on site are boosted by a diesel generator to a voltage as described above. The low-voltage test power supply is inverted to high-voltage electricity required by the test through the station transformer 220, and the purpose of realizing the high-voltage test of the equipment of the converter station by low-voltage access is achieved. For example, 10kV low-voltage incoming lines of an offshore converter station platform installation and test site can be utilized to generate high voltage on a valve side of a connecting transformer, the voltage of a direct current side can reach 0.7 time of rated direct current voltage, and the voltage between a positive electrode and a negative electrode of the direct current side can reach 448kV taking +/-320 kV commonly used in Europe as an example, so that onshore full monitoring on main equipment of the converter station can be realized.
As shown in fig. 2, the test system 2000 also includes a resistor assembly 2400. Resistor assembly 2400 includes a resistor 2410 and a resistor shunt switch 2420 in parallel therewith. The resistor assembly 2400 is connected between the high voltage winding of the station transformer 220 and the first winding of the coupling transformer 230. According to an exemplary embodiment as shown in fig. 2, the resistor assembly 2400 is disposed before the ac busbar 210. The resistor 2410 may have a resistance value in the range of 50 ohms to 20000 ohms. The high voltage winding of the on-site transformer 220 is indirectly connected to the first winding of the coupling transformer 230 via the resistor assembly 2400, which can effectively reduce the power requirements of the test system 2000 on the test power source.
In the above test system 2000, the station transformer 220, the ac bus 210, the coupling transformer 230, the valve-side switch 250, the valve-side bus 240, the converter valve 261, the bridge arm reactor 262, the dc field device 263 and the corresponding measurement or control are all devices of the offshore converter station 200 itself, and are also engineering practical devices. The test system provided by the application makes full use of existing equipment of the offshore converter station, and does not need to be configured with extra large-scale equipment to build a test platform.
As shown in fig. 2, in the test system 2000, the station transformer 220, the ac bus 210, the connection transformer 230, the valve-side switch 250, the valve-side bus 240, the converter valve 261, the bridge arm reactor 262, the dc field device 263, the resistor 2410, and the resistor parallel switch 2420 actually used in the engineering constitute the converter station internal device 2300, i.e., the primary device of the test system. The testing system further comprises a secondary device (not shown) correspondingly connected with the primary device and used for measuring or controlling the primary device. For example, a transformer and a resistor assembly are respectively connected with the station, so that the connection and control relationship between the secondary equipment and the primary equipment is verified in the test process.
As shown in fig. 2, the testing system 2000 further includes a grounding device 270 disposed between the second winding of the coupling transformer 230 and the converter valve and dc field device 260 as a clamping potential, so that the valve-side voltage potential is balanced. The grounding mode can be a small-capacitance grounding mode, and can also be a star-type reactance plus resistance grounding mode.
Fig. 3 shows a schematic diagram of a test system composition of a flexible direct current transmission converter station according to a second example embodiment of the present application.
As shown in fig. 3, the present application provides a testing system 3000 of a flexible dc transmission converter station according to another embodiment. The test system 3000 is identical in composition to the test system 2000 of fig. 2, except for the location of the resistor assembly 2400.
As shown in fig. 3, a resistor assembly 2400 is connected between the high voltage winding of the station transformer 220 and the first winding of the coupling transformer 230. In contrast to the exemplary embodiment in fig. 2, the resistor assembly 2400 is arranged downstream of the ac busbar 210. The high voltage winding of the station transformer 220 is connected to the ac bus 210. At this time, the resistance value of the resistor 2410 may also be in the range of 50 ohm to 20000 ohm.
Fig. 4 shows a schematic diagram of a test system composition of a flexible direct current transmission converter station according to a third example embodiment of the present application.
As shown in fig. 4, the present application provides a testing system 4000 for a flexible dc transmission converter station according to another embodiment. The test system 4000 has the same components as the test system 2000 of fig. 2, except for the location of the resistor assembly 2400.
As shown in fig. 4, a resistor assembly 2400 is disposed between the low voltage winding of the station transformer 220 and the test power supply 2100. Specifically, the resistor assembly 2400 is disposed after the low-voltage ac switch 2200. The test power supply 2100 is connected to the resistor assembly 2400 through a low voltage ac switch 2200. At this time, the resistance value of the resistor 2410 may range from 5 ohm to 2000 ohm. According to some embodiments of the present application, the resistor 2410 may also include an inductive element in series with the resistor 2410. The inductance of the inductive element may be in the range of 1 mH-1H.
Fig. 5 shows a schematic diagram of a test system composition of a flexible direct current transmission converter station according to a fourth example embodiment of the present application.
As shown in fig. 5, according to another embodiment, the present application provides a test system 5000. The test system 5000 is identical in composition to the test system 4000 of fig. 4, except for the location of the resistor assembly 2400.
As shown in fig. 5, a resistor assembly 2400 is disposed between the low voltage winding of the station transformer 220 and the test power supply 2100. Specifically, the resistor assembly 2400 is disposed before the low-voltage ac switch 2200. The test power supply 2100 is directly connected to the resistor assembly 2400. At this time, the resistance value of the resistor 2410 may also be in the range of 5 ohm to 2000 ohm. According to some embodiments of the present application, the resistor 2410 may also include an inductive element in series with the resistor 2410. The inductance value range of the inductance element may include: 1 mH-1H.
According to other embodiments of the present application, the resistor component in the test system may further be connected between the second winding of the coupling transformer and the converter valve and the dc field device, and the system composition is the same as that of the test system, and is not described herein again.
Fig. 6 shows a flow chart of a method of testing a flexible direct current transmission converter station according to an example embodiment of the present application.
As shown in fig. 6, according to an exemplary embodiment, the testing method of the flexible direct current transmission converter station provided in the present application is applied to the testing system shown in fig. 2 to fig. 5, and includes:
in step S610, the readiness of primary and secondary equipment in the assay system is monitored. When all the equipment in the test system is ready, the test can begin.
In step S620, the ac switch 211 and the valve side switch 250 of the ac bus are closed;
in step S630, the low-voltage ac switch 2200 is closed to charge the primary device. Specifically, after the low-voltage ac switch 2200 is closed, the commutation station main device may be high-voltage charged through the resistor 2410.
In step S640, after a delay, the resistor parallel switch 2420 is closed, and the converter valve and the dc field device 260 are further charged at high voltage. The delay may range from 5s to 500 s.
In step S650, the primary and secondary device tests are performed. The method specifically comprises the steps of testing a station transformer, an alternating current bus, a connecting transformer, a valve side switch, a valve side bus, a converter valve, a bridge arm reactor, direct current field equipment, corresponding measuring or control equipment and the like, and detecting the connection correctness. For example, the DC voltage is verified, and when the DC voltage is greater than 0.5 times of rated DC voltage or the valve side voltage is greater than 0.7 times of rated valve side voltage, the voltage and the insulation tolerance condition of relevant equipment are verified.
In step S660, the valve-side switch 250 or the ac switch 211 of the ac bus 210 or the low-voltage ac switch 2200 is turned off to perform the passive inversion test. The specific passive inversion test process is as follows: after the power supply is cut off, the voltage of the valve side bus 240 is inverted after the constant reference wave and the unlocking signal are given and are executed through the converter valve 261, the bridge arm reactor 262 and the direct current field device 263. In this process, the correctness of the execution of the coupling transformer 230, the valve-side switch 250, the valve-side busbar 240, the converter valve 261, the bridge arm reactor 262 and the dc field device 263 is verified under the control of the measuring or control device.
In addition, in the above test process, an active charging test may be performed on the converter valve and the dc field device 260 to monitor the functional integrity of the converter valve and the valve control system. After the active charging, the converter valve can be subjected to a short-time active unlocking test under the condition of power supply operation in a test site. The test method can be used for verifying the connection and control correctness of the control system and the main equipment, such as the station transformer, the alternating current bus, the coupling transformer, the valve side switch, the valve side bus, the converter valve, the bridge arm reactor, the direct current field equipment and the like, so that the correctness of the control system to the main equipment is ensured, the problem of offshore debugging is avoided, the repeated onshore back-and-forth transportation, installation and debugging are caused, the space is saved, and the time and the cost are also saved.
The application provides a flexible direct current transmission converter station's test system directly utilizes each main equipment that marine converter station used when buildding on the offshore platform to test, does not need extra equipment or removes current position. After the test is finished, the test can be directly transported to the sea. Besides the low-voltage alternating-current switch, the resistor and the parallel switch of the resistor, an additional test field is not needed to build a test platform. On the other hand, the test system provided by the application completes the high-voltage test of the main equipment of the convertor station by utilizing the 10kV low-voltage incoming line of the onshore installation test site of the offshore convertor station. Through tests, not only are a system loop and main equipment verified, but also the wiring and control functions of a converter station control system and main equipment are verified, the problems are solved on the land, and the offshore debugging time, the engineering debugging period and the cost are reduced. In addition, the test power supply is placed at the low-voltage end of the incoming line, so that the requirement on the capacity of the test power supply is reduced.
It should be understood that the above examples are only for clearly illustrating the present application and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of this invention may be made without departing from the spirit or scope of the invention.
Claims (18)
1. A test system of a flexible direct current transmission converter station is characterized by comprising:
a station transformer;
a test power supply on a test site is connected to a low-voltage winding of the station transformer through a low-voltage alternating-current switch;
a first winding of the connecting transformer is connected with a high-voltage winding of the station transformer;
the converter valve and the direct current field equipment are connected to the second winding of the connecting transformer;
and the resistor component is connected between a low-voltage winding of the station transformer and the test power supply, or between a high-voltage winding of the station transformer and a first winding of the connecting transformer, or between a second winding of the connecting transformer and the converter valve and the direct-current field equipment.
2. Testing system according to claim 1, characterized in that the flexible direct current transmission converter station is used as an offshore flexible direct current transmission converter station.
3. The testing system of claim 1, wherein a voltage level of the test power supply matches a voltage level of the station transformer low voltage winding.
4. The testing system of claim 3, wherein the test power supply comprises:
the testing system is located at the current or boosted one of a 10kV power supply, a 20kV power supply, a 35kV power supply and a 110kV power supply.
5. The testing system of claim 1, wherein the resistor assembly comprises:
a resistor;
a resistor parallel switch in parallel with the resistor.
6. The testing system of claim 5, said resistor assembly being connected between a high voltage winding of said station transformer and a first winding of said coupling transformer, wherein said resistor assembly is disposed before or after said ac bus, said resistor having a resistance value in the range of 50-20000 ohms.
7. The testing system of claim 5, said resistor assembly being connected between a low voltage winding of said station transformer and said test power supply, wherein said resistor assembly is disposed before or after said low voltage ac switch, said resistor having a resistance value in the range of 5 ohms to 2000 ohms.
8. The testing system of claim 1, wherein the first winding of the coupling transformer is connected to the high voltage winding of the station transformer by an ac bus.
9. The testing system of claim 8, wherein the ac bus comprises a bus with or without an ac switch.
10. The testing system of claim 9, wherein the means for accessing the ac bus into the first winding of the coupling transformer comprises:
3/2 wiring or double bus wiring.
11. The testing system of claim 1, wherein the converter valve and dc field device are switched into the second winding of the coupling transformer through a valve side bus.
12. The testing system of claim 11, wherein the valve side bus comprises a bus with a valve side switch or a bus without a valve side switch.
13. The testing system of claim 1, further comprising:
and the grounding device is arranged between the second winding of the connecting transformer and the converter valve and the direct current field equipment.
14. The testing system of claim 13, wherein the grounding means comprises:
small capacitance grounding or star reactance plus resistance grounding.
15. The testing system of claim 1, wherein the station forms a primary device of the testing system with a transformer, a coupling transformer, a converter valve, and a dc field device and a resistor assembly, the testing system further comprising:
and the secondary equipment is correspondingly connected with the primary equipment and is used for measuring or controlling the primary equipment.
16. A testing method for a flexible dc transmission converter station, applied to a testing system according to any of claims 1-15, characterized by comprising:
monitoring the readiness of primary and secondary equipment in the test system;
an AC switch that closes the AC bus and the valve side switch;
closing the low-voltage alternating-current switch to charge the primary equipment;
after a period of time delay after charging, closing the resistor parallel switch, and further charging the converter valve and the direct current field equipment;
performing the primary equipment and secondary equipment tests;
and disconnecting the valve side switch or the alternating current switch of the alternating current bus or the low-voltage alternating current switch to perform a passive inversion test.
17. Test method according to claim 16, characterized in that the period of time delay is in the range of 5s-500 s.
18. The assay method of claim 16, further comprising:
and carrying out active charging test on the converter valve and the direct current field equipment.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010259335.0A CN111426910B (en) | 2020-04-03 | 2020-04-03 | Test system and test method for flexible direct-current transmission converter station |
| EP21781686.7A EP4130764A4 (en) | 2020-04-03 | 2021-04-02 | Test system and test method for converter station in flexible direct current transmission |
| PCT/CN2021/085235 WO2021197465A1 (en) | 2020-04-03 | 2021-04-02 | Test system and test method for converter station in flexible direct current transmission |
Applications Claiming Priority (1)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112039107A (en) * | 2020-08-28 | 2020-12-04 | 西安西电电力系统有限公司 | Flexible direct current transmission debugging system and flexible direct current transmission debugging live method |
| WO2021197465A1 (en) * | 2020-04-03 | 2021-10-07 | 南京南瑞继保电气有限公司 | Test system and test method for converter station in flexible direct current transmission |
| CN113495200A (en) * | 2020-04-03 | 2021-10-12 | 南京南瑞继保电气有限公司 | Testing system and testing method for flexible direct current transmission converter station |
| CN114094616A (en) * | 2021-11-23 | 2022-02-25 | 南通振华重型装备制造有限公司 | High-voltage debugging power supply method for offshore flexible direct current converter station |
Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101304170A (en) * | 2008-06-26 | 2008-11-12 | 中国电力科学研究院 | System debug method for high voltage direct current transmission project |
| CN102279325A (en) * | 2011-04-19 | 2011-12-14 | 中国电力科学研究院 | Ultra high voltage direct current (UHVDC) transmission engineering station system debugging method |
| CN102983568A (en) * | 2012-11-12 | 2013-03-20 | 华北电力大学 | Modular multilevel converter high voltage direct current (MMC-HVDC) converter station starting method used for power network black start |
| CN103197271A (en) * | 2013-02-25 | 2013-07-10 | 国网智能电网研究院 | Testing method for maximum metal condition (MMC) topological flexible direct-current transmission testing platform |
| CN103268117A (en) * | 2013-04-25 | 2013-08-28 | 中国南方电网有限责任公司电网技术研究中心 | MMC flexible direct-current control device testing system and method based on RTDS |
| SE1300642A1 (en) * | 2013-10-11 | 2013-10-15 | Abb Research Ltd | Voltage converter topology topology |
| CN203276020U (en) * | 2013-04-25 | 2013-11-06 | 中国南方电网有限责任公司电网技术研究中心 | MMC flexible direct-current control device test system based on RTDS (real time digital simulator) |
| WO2014037583A2 (en) * | 2012-09-10 | 2014-03-13 | Abb Technology Ag | Power distribution system for autonomous facilities |
| CN106655235A (en) * | 2016-10-18 | 2017-05-10 | 南方电网科学研究院有限责任公司 | Energy balance regulation and control method and system of hybrid multi-terminal direct current system |
| CN107895963A (en) * | 2017-11-27 | 2018-04-10 | 中国西电电气股份有限公司 | A kind of soft straight current conversion station topological structure of marine wind electric field and its grid-connected system |
| CN108508871A (en) * | 2018-04-12 | 2018-09-07 | 广东电网有限责任公司 | A kind of flexible direct current protection test system of field application |
| EP3512062A1 (en) * | 2018-01-11 | 2019-07-17 | Ørsted Wind Power A/S | An offshore wind farm and substation |
| CN110130295A (en) * | 2016-12-08 | 2019-08-16 | 西安许继电力电子技术有限公司 | Offshore wind power flexible DC power transmission converter station bridge arm valve tower layout and offshore platform |
| CN111537842A (en) * | 2020-04-03 | 2020-08-14 | 南京南瑞继保电气有限公司 | Testing system and testing method for flexible direct current transmission converter station |
| CN111799661A (en) * | 2020-06-04 | 2020-10-20 | 许继集团有限公司 | Converter station of modular offshore flexible direct current transmission system |
| CN113495200A (en) * | 2020-04-03 | 2021-10-12 | 南京南瑞继保电气有限公司 | Testing system and testing method for flexible direct current transmission converter station |
-
2020
- 2020-04-03 CN CN202010259335.0A patent/CN111426910B/en active Active
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101304170A (en) * | 2008-06-26 | 2008-11-12 | 中国电力科学研究院 | System debug method for high voltage direct current transmission project |
| CN102279325A (en) * | 2011-04-19 | 2011-12-14 | 中国电力科学研究院 | Ultra high voltage direct current (UHVDC) transmission engineering station system debugging method |
| WO2014037583A2 (en) * | 2012-09-10 | 2014-03-13 | Abb Technology Ag | Power distribution system for autonomous facilities |
| CN102983568A (en) * | 2012-11-12 | 2013-03-20 | 华北电力大学 | Modular multilevel converter high voltage direct current (MMC-HVDC) converter station starting method used for power network black start |
| CN103197271A (en) * | 2013-02-25 | 2013-07-10 | 国网智能电网研究院 | Testing method for maximum metal condition (MMC) topological flexible direct-current transmission testing platform |
| CN103268117A (en) * | 2013-04-25 | 2013-08-28 | 中国南方电网有限责任公司电网技术研究中心 | MMC flexible direct-current control device testing system and method based on RTDS |
| CN203276020U (en) * | 2013-04-25 | 2013-11-06 | 中国南方电网有限责任公司电网技术研究中心 | MMC flexible direct-current control device test system based on RTDS (real time digital simulator) |
| SE1300642A1 (en) * | 2013-10-11 | 2013-10-15 | Abb Research Ltd | Voltage converter topology topology |
| CN106655235A (en) * | 2016-10-18 | 2017-05-10 | 南方电网科学研究院有限责任公司 | Energy balance regulation and control method and system of hybrid multi-terminal direct current system |
| CN110130295A (en) * | 2016-12-08 | 2019-08-16 | 西安许继电力电子技术有限公司 | Offshore wind power flexible DC power transmission converter station bridge arm valve tower layout and offshore platform |
| CN107895963A (en) * | 2017-11-27 | 2018-04-10 | 中国西电电气股份有限公司 | A kind of soft straight current conversion station topological structure of marine wind electric field and its grid-connected system |
| EP3512062A1 (en) * | 2018-01-11 | 2019-07-17 | Ørsted Wind Power A/S | An offshore wind farm and substation |
| CN108508871A (en) * | 2018-04-12 | 2018-09-07 | 广东电网有限责任公司 | A kind of flexible direct current protection test system of field application |
| CN111537842A (en) * | 2020-04-03 | 2020-08-14 | 南京南瑞继保电气有限公司 | Testing system and testing method for flexible direct current transmission converter station |
| CN113495200A (en) * | 2020-04-03 | 2021-10-12 | 南京南瑞继保电气有限公司 | Testing system and testing method for flexible direct current transmission converter station |
| CN111799661A (en) * | 2020-06-04 | 2020-10-20 | 许继集团有限公司 | Converter station of modular offshore flexible direct current transmission system |
Non-Patent Citations (8)
| Title |
|---|
| OLUSEGUN OLOWOOKERE: "AC fault ride through of modular multilevel converter VSC-HVDC transmission systems", 《2015 50TH INTERNATIONAL UNIVERSITIES POWER ENGINEERING CONFERENCE (UPEC)》 * |
| OLUSEGUN OLOWOOKERE: "AC fault ride through of modular multilevel converter VSC-HVDC transmission systems", 《2015 50TH INTERNATIONAL UNIVERSITIES POWER ENGINEERING CONFERENCE (UPEC)》, 3 December 2015 (2015-12-03) * |
| 傅春翔: "用于海上风电并网的柔性直流系统接地方式研究", 《电力系统保护与控制》 * |
| 傅春翔: "用于海上风电并网的柔性直流系统接地方式研究", 《电力系统保护与控制》, 16 October 2019 (2019-10-16) * |
| 李泓志: "高压大容量柔性直流输电系统绝缘配合", 《电网技术》 * |
| 李泓志: "高压大容量柔性直流输电系统绝缘配合", 《电网技术》, 30 June 2016 (2016-06-30) * |
| 郝为瀚: "海上平台柔性直流换流站工程应用方案研究", 《南方能源建设》 * |
| 郝为瀚: "海上平台柔性直流换流站工程应用方案研究", 《南方能源建设》, 30 April 2017 (2017-04-30) * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021197465A1 (en) * | 2020-04-03 | 2021-10-07 | 南京南瑞继保电气有限公司 | Test system and test method for converter station in flexible direct current transmission |
| CN113495200A (en) * | 2020-04-03 | 2021-10-12 | 南京南瑞继保电气有限公司 | Testing system and testing method for flexible direct current transmission converter station |
| CN113495200B (en) * | 2020-04-03 | 2024-09-13 | 南京南瑞继保电气有限公司 | Test system and test method for flexible direct-current transmission converter station |
| CN112039107A (en) * | 2020-08-28 | 2020-12-04 | 西安西电电力系统有限公司 | Flexible direct current transmission debugging system and flexible direct current transmission debugging live method |
| CN114094616A (en) * | 2021-11-23 | 2022-02-25 | 南通振华重型装备制造有限公司 | High-voltage debugging power supply method for offshore flexible direct current converter station |
| CN114094616B (en) * | 2021-11-23 | 2023-07-07 | 南通振华重型装备制造有限公司 | High-voltage power supply debugging method for offshore flexible direct-current converter station |
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