CN102522808A - Auxiliary power supply system and auxiliary power supply method of power electronic equipment - Google Patents
Auxiliary power supply system and auxiliary power supply method of power electronic equipment Download PDFInfo
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- CN102522808A CN102522808A CN2011104141679A CN201110414167A CN102522808A CN 102522808 A CN102522808 A CN 102522808A CN 2011104141679 A CN2011104141679 A CN 2011104141679A CN 201110414167 A CN201110414167 A CN 201110414167A CN 102522808 A CN102522808 A CN 102522808A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The invention discloses an auxiliary power supply system and an auxiliary power supply method of power electronic equipment. The auxiliary power supply system comprises a power grid, a network-side converter which is accessed to the power grid, and a direct current bus capacitor; both ends of the direct current bus capacitor are connected with a direct current bus which is output from the network-side converter; the auxiliary power supply system further comprises a Direct Current (DC)/Alternating Current (AC) inverter; and an input end of the DC/AC inverter is connected with two poles of the direct current bus. The invention further provides an auxiliary power supply method of the power electronic equipment, which comprises the steps that: three-phase alternating current output by the power grid is converted into direct current and then the direct current is output from the direct current bus; when the power grid works normally, the direct current bus capacitor is charged by the direct current bus, the DC/AC inverter takes power from the direct current bus, inverts and stabilizes voltage of the power, and then outputs the power; when the power grid is disconnected, the direct current bus capacitor discharges to the DC/AC inverter; and the DC/AC inverter inverts and stabilizes voltage of received power, and then outputs the power. As no transformer and Uninterrupted Power Supply (UPS) is used, cost is reduced, and reliability as well as utilization rate of the overall power electronic equipment are improved.
Description
Technical field
The present invention relates to electric power system and method, relate in particular to a kind of auxiliary power supply system and method for power electronic equipment.
Background technology
UPS (uninterrupted power supply) is a kind of energy storage device that contains, and is the AC power of the voltage stabilization and frequency stabilization of chief component with rectifier, inverter.It mainly utilizes energy storage device such as battery continual supply of electric power to be provided when having a power failure, for computer, server, memory device, communications network system or industrial control system etc.When civil power input just often, UPS is supplied to load to use after with the civil power voltage stabilization and frequency stabilization; When civil power interrupted (like accident interruption), UPS was immediately with the electric energy of energy storage device (like battery pack), and the method through inversion continues the supply alternating current to load, made load keep operate as normal and did corresponding protection.
At present in wind power generation and the solar power system, mostly utilize UPS as the back-up source of protecting usefulness for the visual plant of core controller part (like electricity generation system master controller or current transformer core controller), monitoring communication system or other Alternating Current Power Supplies.Fig. 1 is an example with existing wind power generation inverter, shows the circuit diagram of its auxiliary power supply system.In this auxiliary power supply system, the input of transformer 20 inserts electrical network 10, and output is connected with UPS 70; And bus D.C. resistance 40 also need be parallelly connected with bus discharge resistance 80, to solve the bus discharge problem.During electrical network 10 operate as normal; Transformer 20 converts the high-tension electricity (being generally 690vac line voltage) of electrical network 10 inputs into low pressure (being generally 380Vac line voltage); The output phase voltage (230Vac) of transformer 20 is taken from the input of UPS 70 then, exports to the power supply of one-board power supply plate.When electrical network 10 power down took place, the battery discharge in the UPS 70 was kept the power supply of system single board power supply, thereby kept the normal of monitoring and communication.But the residing environment of wind generator system and solar power system is mostly relatively more abominable, than higher, therefore, need satisfy the technical grade product of commercial Application on the selection principle of UPS 70 for the requirement of backup protection power supply; Meanwhile, the core controller of wind generator system and solar power system is all smaller with the required capacity of monitoring communication apparatus, is generally hundreds of to last kilowtt, and is therefore, less to the capacity requirement of back-up source.And receive the influence in cost, market, and mostly the UPS of low capacity is the business level product at present, it is difficult to satisfy the demand of abominable operational environment in performance and design.In addition, be that a failure rate is high as the battery of UPS energy storage, and the parts that very easily damage in adverse circumstances such as high temperature, low temperature, high height above sea level, this causes UPS when normal the use, will change once in almost per 3 years, makes cost improve.
On the other hand; In the low-voltage crossing process of existing wind generator system and solar energy system; Utilize UPS 70 electric energy to be provided for the visual plant of core controller, monitoring communication part and other Alternating Current Power Supply, the system that makes can pass through through low-voltage smoothly.Yet under the situation that does not have UPS 70, if need satisfy under the situation that electrical network 10 falls also can operate as normal and do not break off for contactor, system need select D.C. contactor for use.Specifically as shown in Figure 2; When electrical network 10 breaks down disconnection,, need to use D.C. contactor 12 for the power supply of keeping D.C. contactor and the output power down that prevents the system single board power supply; Increase the dc capacitor 11 of vast capacity simultaneously at the output of auxiliary electrical source plate 200.But D.C. contactor is not conventional material, and cost can be high, and D.C. contactor is bigger at the electric current of closure moment control line bag.
Summary of the invention
The technical problem that the present invention will solve be in the prior art in the auxiliary power supply system of power electronic equipment because of adopting UPS to cause the low defective of cost height and reliability and utilance, a kind of auxiliary power supply system and method for power electronic equipment is provided.
The technical solution adopted for the present invention to solve the technical problems is: a kind of auxiliary power supply system of power electronic equipment is provided, comprises
Electrical network;
Insert the grid side converter of said electrical network; And
Dc-link capacitance, the two ends of said dc-link capacitance are connected with the two poles of the earth of the dc bus of exporting from said grid side converter respectively;
Wherein, said auxiliary power supply system also comprises the DC/AC inverter, and the input of said DC/AC inverter is connected with the two poles of the earth of said dc bus respectively.
In the auxiliary power supply system according to the power electronic equipment of the embodiment of the invention, said auxiliary power supply system also comprises the auxiliary electrical source plate that is connected with the output of said DC/AC inverter.
In the auxiliary power supply system according to the power electronic equipment of the embodiment of the invention, said auxiliary power supply system also comprises the A.C. contactor that is connected with the output of said DC/AC inverter.
In the auxiliary power supply system according to the power electronic equipment of the embodiment of the invention, said power electronic equipment is wind-force generating converter or solar power generation inverter.
The present invention also provides a kind of auxiliary power supply method of power electronic equipment, comprises
After converting direct current into, exports the three-phase alternating current that grid side converter is exported electrical network from dc bus;
When said electrical network operate as normal, through said dc bus dc-link capacitance is charged, and the DC/AC inverter is from said dc bus power taking, after the inversion voltage stabilizing with the output power supply;
When said electrical network broke off, said dc-link capacitance discharged to said DC/AC inverter, and said DC/AC inverter will be supplied power with output after the electric energy inversion voltage stabilizing of said dc-link capacitance reception.
In auxiliary power supply method according to the power electronic equipment of the embodiment of the invention, said DC/AC inverter with the electric energy inversion voltage stabilizing that receives after to export the auxiliary electrical source plate to.
In auxiliary power supply method according to the power electronic equipment of the embodiment of the invention, said DC/AC inverter with the electric energy inversion voltage stabilizing that receives after to export A.C. contactor to.
In the auxiliary power supply method according to the power electronic equipment of the embodiment of the invention, said power electronic equipment is wind-force generating converter or solar power generation inverter.
The beneficial effect that the present invention produces is: in the auxiliary power supply system according to the power electronic equipment of the embodiment of the invention; The transformer and the UPS that need setting in the existing auxiliary power supply system have been saved; From direct current directly power taking at present, output is supplied power after the inversion voltage stabilizing in the time of can being implemented in the electrical network operate as normal through inserting the DC/AC inverter at the two poles of the earth of dc bus; When electrical network breaks off, through the dc-link capacitance discharge of parallel connection with it, with output power supply after the energy storage inversion voltage stabilizing on the dc-link capacitance.Because utilize the energy storage of bus capacitor, substituted reliability and the not high UPS of utilance in the conventional design, make the reliability of complete machine and utilance all promote, greater advantage is all arranged on space and cost for complete machine.In addition, the dc bus power taking owing to from current transformer makes the bus discharge problem of current transformer become simpler, no longer needs parallelly connected bus discharge resistance, and cost is lower simultaneously.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the electrical block diagram of auxiliary power supply system when selecting UPS for use of power electronic equipment in the prior art;
Fig. 2 is the electrical block diagram of auxiliary power supply system when not selecting UPS for use of power electronic equipment in the prior art;
Fig. 3 is the electrical block diagram according to the auxiliary power supply system of the power electronic equipment of the embodiment of the invention;
Fig. 4 is the electrical block diagram according to the auxiliary power supply system of the power electronic equipment of first embodiment of the invention;
Fig. 5 is the electrical block diagram according to the auxiliary power supply system of the power electronic equipment of second embodiment of the invention.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Fig. 3 shows the electrical block diagram according to the auxiliary power supply system of the power electronic equipment of the embodiment of the invention, and this power electronic equipment can be wind-force generating converter or solar power generation inverter.As shown in Figure 3, the auxiliary power supply system of this power electronic equipment comprises electrical network 10, grid side converter 30 and dc-link capacitance 40.Wherein, the input of grid side converter 30 inserts electrical network 10, thereby will convert direct current to from the three-phase alternating current of electrical network 10 inputs, and through the direct current output of dc bus 100 with conversion.The two ends of dc-link capacitance 40 are connected with the two poles of the earth of the dc bus of exporting from grid side converter 30 100 respectively, i.e. dc-link capacitance 40 parallel connections insert the two poles of the earth at dc bus 100.The auxiliary power supply system of this power electronic equipment also comprises DC/AC inverter 90, and the two poles of the earth of the input of this DC/AC inverter 90 are connected with the two poles of the earth of dc bus 100 respectively, promptly forms with dc-link capacitance 40 through dc bus 100 to be connected in parallel.In an embodiment of the present invention, the output of this DC/AC inverter 90 can be connected with auxiliary electrical source plate 200, safety device 400 (such as core controller and monitoring communications equipment etc.) and/or other important alternating current equipment 500.
To describe auxiliary power supply system and method for supplying power to the first embodiment of the present invention below, as shown in Figure 4, the output of this DC/AC inverter 90 is connected with auxiliary electrical source plate 200.In practical work process, when electrical network 10 operate as normal, the output of dc bus 100 the two poles of the earth is through the direct current of grid side converter 30 conversions.In the electric current output procedure, can charge on the one hand through the dc-link capacitance 40 that 100 pairs of dc buss are linked into 100 liang of interpolars of dc bus; On the other hand, the DC/AC inverter 90 that is linked into dc bus 100 the two poles of the earth is directly from dc bus 100 power takings, the electric energy of input carried out forming the stable AC electricity after the inversion voltage stabilizing supply power to export auxiliary electrical source plate 200 to.
When electrical network 10 quits work, failover and when breaking off, the input of the electric power of grid side converter 30 is broken off for example.Because dc-link capacitance 40 is connected in parallel on the two poles of the earth of dc bus 100 with DC/AC inverter 90, at this moment, charged dc-link capacitance 40 begins DC/AC inverter 90 is charged in electrical network 10 course of normal operation.DC/AC inverter 90 will be supplied power to export auxiliary electrical source plate 200 to from formation stable AC electricity after electric energy (direct current) the inversion voltage stabilizing of dc-link capacitance 40 receptions; Thereby can keep the operate as normal of auxiliary electrical source plate 200, the system that makes can successfully accomplish protection and the monitoring communication function after the power down.
In the second embodiment of the present invention, the output of DC/AC inverter 90 no longer connects auxiliary electrical source plate 200, but connects A.C. contactor 300, and is specifically as shown in Figure 5.In the concrete course of work; When electrical network 10 operate as normal; Be veneer electric power system when in running order, DC/AC inverter 90 is exported to A.C. contactor 300 to supply power from dc bus 100 power takings after the dc inverter voltage stabilizing with grid side converter 30 conversions.When electrical network 10 broke off, DC/AC inverter 90 utilized the energy storage of dc-link capacitance 40 to keep inverter output voltage, thereby guaranteed the operate as normal of A.C. contactor 300.In the auxiliary power supply system of this power electronic equipment, even without UPS, need not use D.C. contactor yet, use conventional A.C. contactor to get final product.
Should be appreciated that; The first above-mentioned embodiment and second embodiment are only as describing the present invention; It is not limitation of the present invention; In the auxiliary power supply system according to the power electronic equipment of the embodiment of the invention, the output of DC/AC inverter 90 also can be connected with A.C. contactor 300 with auxiliary electrical source plate 200 simultaneously, perhaps also is connected with other important alternating current equipment.
Can find out from above; In auxiliary power supply system and method according to the power electronic equipment of the embodiment of the invention; The transformer and the UPS that need setting in the existing auxiliary power supply system have been saved; From the direct power taking of dc bus, output is supplied power after the inversion voltage stabilizing in the time of can being implemented in the electrical network operate as normal through inserting the DC/AC inverter at the two poles of the earth of dc bus; When electrical network breaks off,,, thereby realized the generator protection behind the power electronic equipment grid power blackout and monitored communication in short-term output power supply after the energy storage inversion voltage stabilizing on the dc-link capacitance through the dc-link capacitance discharge of parallel connection with it.In sum,, substituted reliability and the not high UPS of utilance in the conventional design, made the reliability of complete machine and utilance all get a promotion, greater advantage has all been arranged on space and cost for complete machine because utilize the energy storage of bus capacitor.In addition, the dc bus power taking owing to from current transformer makes the bus discharge problem of current transformer become simpler, no longer needs parallelly connected bus discharge resistance, and cost is lower simultaneously.Meanwhile, utilize the energy storage of dc-link capacitance, make that the A.C. contactor powerup issue in the low pressure crossing process is able to solve,, also can not use expensive D.C. contactor, further reduced cost even do not use UPS.
Should be understood that, concerning those of ordinary skills, can improve or conversion, and all these improvement and conversion all should belong to the protection range of accompanying claims of the present invention according to above-mentioned explanation.
Claims (8)
1. the auxiliary power supply system of a power electronic equipment comprises
Electrical network;
Insert the grid side converter of said electrical network; And
Dc-link capacitance, the two ends of said dc-link capacitance are connected with the two poles of the earth of the dc bus of exporting from said grid side converter respectively;
It is characterized in that said auxiliary power supply system also comprises the DC/AC inverter, the input of said DC/AC inverter is connected with the two poles of the earth of said dc bus respectively.
2. the auxiliary power supply system of power electronic equipment according to claim 1 is characterized in that, said auxiliary power supply system also comprises the auxiliary electrical source plate that is connected with the output of said DC/AC inverter.
3. the auxiliary power supply system of power electronic equipment according to claim 1 is characterized in that, said auxiliary power supply system also comprises the A.C. contactor that is connected with the output of said DC/AC inverter.
4. the auxiliary power supply system of power electronic equipment according to claim 1 is characterized in that, said power electronic equipment is wind-force generating converter or solar power generation inverter.
5. the auxiliary power supply method of a power electronic equipment is characterized in that, comprises
After converting direct current into, exports the three-phase alternating current that grid side converter is exported electrical network from dc bus;
When said electrical network operate as normal, through said dc bus dc-link capacitance is charged, and the DC/AC inverter is from said dc bus power taking, after the inversion voltage stabilizing with the output power supply;
When said electrical network broke off, said dc-link capacitance discharged to said DC/AC inverter, and said DC/AC inverter will be supplied power with output after the electric energy inversion voltage stabilizing of said dc-link capacitance reception.
6. the auxiliary power supply method of power electronic equipment according to claim 5 is characterized in that, said DC/AC inverter with the electric energy inversion voltage stabilizing that receives after to export the auxiliary electrical source plate to.
7. the auxiliary power supply method of power electronic equipment according to claim 5 is characterized in that, said DC/AC inverter with the electric energy inversion voltage stabilizing that receives after to export A.C. contactor to.
8. the auxiliary power supply method of power electronic equipment according to claim 5 is characterized in that, said power electronic equipment is wind-force generating converter or solar power generation inverter.
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| CN201110414167.9A CN102522808B (en) | 2011-12-13 | 2011-12-13 | Auxiliary power supply system and auxiliary power supply method of power electronic equipment |
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| CN201110414167.9A CN102522808B (en) | 2011-12-13 | 2011-12-13 | Auxiliary power supply system and auxiliary power supply method of power electronic equipment |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103048591A (en) * | 2013-01-11 | 2013-04-17 | 南京航空航天大学 | Power grid environment monitoring circuit |
| CN109936215A (en) * | 2019-03-27 | 2019-06-25 | 沈阳微控新能源技术有限公司 | A kind of uninterruptible power system of energy storage device of magnetic suspension flywheel |
| CN110212744A (en) * | 2019-05-08 | 2019-09-06 | 浙江芯能光伏科技股份有限公司 | Centralized inverter bus capacitor discharge resistance energy-saving control device |
| CN110932384A (en) * | 2019-12-16 | 2020-03-27 | 珠海格力电器股份有限公司 | Power supply management system and method and robot |
| CN114629370A (en) * | 2022-03-29 | 2022-06-14 | 阳光电源股份有限公司 | Power conversion system, control method for power conversion system, and power system |
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| CN2938695Y (en) * | 2006-08-15 | 2007-08-22 | 李英 | HID lamp uninterrupted lighting electronic ballast device |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103048591A (en) * | 2013-01-11 | 2013-04-17 | 南京航空航天大学 | Power grid environment monitoring circuit |
| CN109936215A (en) * | 2019-03-27 | 2019-06-25 | 沈阳微控新能源技术有限公司 | A kind of uninterruptible power system of energy storage device of magnetic suspension flywheel |
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| CN110212744A (en) * | 2019-05-08 | 2019-09-06 | 浙江芯能光伏科技股份有限公司 | Centralized inverter bus capacitor discharge resistance energy-saving control device |
| CN110932384A (en) * | 2019-12-16 | 2020-03-27 | 珠海格力电器股份有限公司 | Power supply management system and method and robot |
| CN114629370A (en) * | 2022-03-29 | 2022-06-14 | 阳光电源股份有限公司 | Power conversion system, control method for power conversion system, and power system |
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| CN102522808B (en) | 2014-12-24 |
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