CN203491921U - Active and reactive dispatchable control device of distributed photovoltaic power station - Google Patents
Active and reactive dispatchable control device of distributed photovoltaic power station Download PDFInfo
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Abstract
本实用新型提供一种分布式光伏电站有功无功可调度控制装置，包括信号采样单元、采样信号处理单元和控制单元；信号采样单元采集并网逆变器和配电站的连接点处的电压、电流等数据并传输给采样信号处理单元；采样信号处理单元对接收的采样数据信号采用基于小波滤波的有功无功解耦控制策略进行处理后将信号传输给控制单元；控制单元对接收的数据进行分析处理，判断当前分布式光伏电站的运行状况，并根据相应情况对分布式发电单元进行有功无功调度。本实用新型结构简单，成本较低，安装使用方便；能够实现对有功、无功电流的精确测量并有效解除有功、无功电流间的相互影响，使系统获得良好的动态和稳态控制特性，满足电网对光伏电站的调度控制要求。
The utility model provides a dispatchable control device for active and reactive power of a distributed photovoltaic power station, which includes a signal sampling unit, a sampling signal processing unit and a control unit; the signal sampling unit collects the voltage at the connection point between the grid-connected inverter and the power distribution station , current and other data and transmit them to the sampling signal processing unit; the sampling signal processing unit uses wavelet filter-based active and reactive power decoupling control strategy to process the received sampling data signal and then transmits the signal to the control unit; the control unit processes the received data Carry out analysis and processing, judge the operating status of the current distributed photovoltaic power station, and dispatch active and reactive power to the distributed power generation unit according to the corresponding situation. The utility model has the advantages of simple structure, low cost and convenient installation and use; it can realize accurate measurement of active and reactive currents and effectively remove the mutual influence between active and reactive currents, so that the system can obtain good dynamic and steady-state control characteristics, Meet the dispatch control requirements of the grid for photovoltaic power plants.
Description
Technical field
The utility model relates to photovoltaic generation scheduling controlling technical field, be specifically related to a kind of can dispatching control device for the meritorious idle of distributed photovoltaic power station.
Background technology
Along with global energy crisis becomes increasingly conspicuous, problem of environmental pollution is on the rise; the focal point directed of future source of energy structural change all be take the New Energy Industry that photovoltaic, wind power generation etc. are representative in countries in the world; thereby distributed power source interconnection technology emerges rapidly in recent years.But grid-connected power system operation and the stability of also can giving of distributed power source is brought many negative effects: as exerting oneself of distributed photovoltaic power station has significant randomness and intermittent feature, can exert an influence to the voltage of electrical network and frequency operation characteristic.Photovoltaic generation reaches after certain permeability in electrical network, and the idle and active power impact of photovoltaic generation etc. usually can cause voltage ripple of power network, causes that the quality of power supply declines, and then has influence on the normal electric energy use of power distribution network.Thereby the grid-connected photovoltaic generating system Reactive Power Dispatch of need to gaining merit is controlled.The dispatching control device in tradition power station is normally according to the principle of generator, meritorious idle to generator scheduling, in power transformation side, mainly by adjusting transformer tapping, adjust voltage, increase reactive power compensator, electrical network is carried out to reactive power compensation to reach the object of adjusting voltage and power factor (PF).And meritorious idle adjusting to photovoltaic generation is generally the characteristic of utilizing photovoltaic combining inverter to have 4 quadrants operations, inverter is equivalent to the conventional electric generators idle adjusting of gaining merit.Current, about gaining merit of photovoltaic power generation grid-connecting, the common research of idle scheduling controlling Basic principles and devices and application, but current dispatching control device, especially for meritorious idle adjusting under high permeability and net, press adjusting and power quality controlling in the control device of the distributed photovoltaic power station of one inverter, because distributed photovoltaic power station operation under high permeability is fluctuateed larger, make voltage in the regional area of power station, meritorious, idle, power factor change is larger, in the larger situation of plural parallel stage installed capacity, because of the general switching frequency of inverter lower (between 3kHz-20kHz), exist larger switching noise to disturb, the impact of the factor such as ripple current and voltage jump, cause not high to the meritorious Reactive Power Dispatch precision of distributed photovoltaic power generation in actual applications, poor effect.
Utility model content
The purpose of this utility model is: overcome the deficiencies in the prior art, provide a kind of switching noise of the MW class inverter that can effectively overcome distributed photovoltaic power generation to disturb and ripple current impact, distributed photovoltaic power station that inverter is implemented to accurately control fast gain merit idle can dispatching control device.
The technical solution of the utility model is: distributed photovoltaic of the present utility model power station meritorious idle can dispatching control device, its design feature is: comprise signal sampling unit, sampled signal processing unit and control unit;
Above-mentioned signal sampling unit is provided with sampled signal input and signal output part; Sampled signal processing unit is provided with signal input part and signal output part; Control unit is provided with signal input part and signal output part;
The signal input part of sampled signal processing unit is electrically connected to the signal output part signal of signal sampling unit; The signal input part of control unit is electrically connected to the signal output part signal of sampled signal processing unit; During use, the sampled signal input of signal sampling unit is electrically connected to the transmission information source of combining inverter and power distribution station; The signal output part of control unit is electrically connected to the control end control signal of combining inverter.
Further scheme is: above-mentioned sampled signal processing unit comprises interface module, parameters of electric power computing module, CPU module, communication module and power module;
Above-mentioned interface module and parameters of electric power computing module are provided with signal input part and signal output part respectively; CPU module is provided with first signal input, secondary signal input and signal output part; Communication module is provided with signal input part and signal output part;
The signal input part of interface module is the signal input part of sampled signal processing unit; The first signal input of the signal output part of parameters of electric power computing module and CPU module is all electrically connected to the signal output part signal of interface module; The secondary signal input of CPU module is electrically connected to the signal output part signal of parameters of electric power computing module; The signal input part of communication module is electrically connected to the signal output part signal of CPU module; The signal output part of communication module is the signal output part of sampled signal processing unit; Power module provides working power for parameters of electric power computing module, CPU module and communication module.
Further scheme is: above-mentioned control unit comprises second communication module, CPU control module, touch display screen, control signal output module and second source module;
Above-mentioned second communication module is provided with signal input part and signal output part; CPU control module is provided with signal input part, interactive signal communication ends and signal output part; Touch display screen is provided with signal communication ends; Control signal output module is provided with signal input part and signal output part;
The signal input part of second communication module is the signal input part of control unit; The signal input part of CPU control module is electrically connected to the signal output part signal of second communication module; The signal communication ends of touch display screen is electrically connected to the interactive signal communication ends two-way signaling of CPU control module; The signal input part of control signal output module is electrically connected to the signal output part signal of CPU control module; The signal output part of control signal output module is the signal output part of control unit; Other each modules that second source module is control unit provide working power.
Further scheme is: the CPU module of above-mentioned sampled signal processing unit comprises the high-speed CPU of 64 floating type dominant frequency 150MHz, and its model preferably adopts TMS320F28335; The CPU control module of control unit comprises the high-speed CPU of 64 floating type dominant frequency 150MHz, and its model preferably adopts TMS320F28335; Touch display screen adopts 7 inches of technical grade touch-screens of ARM9.
Further scheme also has: the CPU module of above-mentioned sampled signal processing unit is the module that adopts the meritorious idle decoupling zero based on wavelet filtering to control to the voltage and current signal of sampling.
The utlity model has positive effect: (1) distributed photovoltaic of the present utility model power station meritorious idle can dispatching control device, simple in structure, cost is lower, easy to install.(2) distributed photovoltaic of the present utility model power station meritorious idle can dispatching control device, its sampled signal processing unit adopts the meritorious idle decoupling control method based on wavelet filtering, first by the electric current to sampling, voltage signal carries out wavelet transform DWT and carries out noise-removed filtering, again by discrete wavelet inverse transformation IDWT reconstructed sample signal, then to reconstruct voltage and current signal, gain merit idle decoupling zero is controlled, thereby realize meritorious, the accurate measurement of reactive current efficient solution are except meritorious, influencing each other between reactive current, make system obtain good dynamic and control characteristic of steady state, realization is generated electricity by way of merging two or more grid systems and the functions such as the multi-functional flexible combination such as idle adjusting and reactive power compensation, improve the quality of power supply of electrical network, meet the scheduling controlling requirement of electrical network to photovoltaic plant.
Accompanying drawing explanation
Fig. 1 is composition structural representation of the present utility model, has also shown the utility model and the combining inverter of distributed photovoltaic power generation unit and the electrical connection of power distribution station that are subject to its control in figure;
Fig. 2 is the composition structural representation of sampled signal processing unit in Fig. 1;
Fig. 3 is the composition structural representation of control unit in Fig. 1;
Fig. 4 is the schematic diagram that the CPU module in Fig. 2 adopts the meritorious idle decoupling zero based on wavelet filtering to control.
Reference numeral in above-mentioned accompanying drawing is as follows:
Signal sampling unit 1,
Sampled signal processing unit 2, interface module 21, parameters of electric power computing module 22, CPU module 23, communication module 24, power module 25,
Control unit 3, second communication module 31, CPU control module 32, touch display screen 33, control signal output module 34, second source module 35,
Combining inverter 4,
Power distribution station 5.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
(embodiment 1)
See Fig. 1, the distributed photovoltaic power station of the present embodiment meritorious idle can dispatching control device, mainly by signal sampling unit 1, sampled signal processing unit 2 and control unit 3, formed.The distributed photovoltaic power station of the present embodiment meritorious idle can dispatching control device for combining inverter 4 and power distribution station 5 are gained merit idle can scheduling controlling.
Signal sampling unit 1 is provided with sampled signal input and signal output part; Sampled signal processing unit 2 is provided with signal input part and signal output part; Control unit 3 is provided with signal input part and signal output part.
The sampled signal input of signal sampling unit 1 is electrically connected to the transmission information source of combining inverter 4 and power distribution station 5 while using; The signal input part of sampled signal processing unit 2 is electrically connected to the signal output part signal of signal sampling unit 1; The signal input part of control unit 3 is electrically connected to the signal output part signal of sampled signal processing unit 2; During use, the signal output part of control unit 3 is electrically connected to the control end control signal of combining inverter 4.
The core devices of signal sampling unit 1 is current transformer and the 200Ma/200mA voltage transmitter of 5A/200mA.The major function of this type current transformer is the different current transformer of model in compatible different substation; Voltage transmitter major function is to be mated and can be carried out voltage sample to different electric pressure systems by built-in resistor, and voltage transmitter output signal is also combined into the phase-locked functional circuit to mains frequency phase place with digital PLL circuit simultaneously; The configuration of the core samples device of signal sampling unit 1 can make equipment adapt to the diversity of distributed photovoltaic system, system is used more flexible, and they isolate to sampling the security reliability that has improved equipment simultaneously, make higher grade of electric insulation.The current transformer of signal sampling unit 1 and voltage transmitter respectively arrange respectively 1 cover on A, the B of the transmission line of combining inverter 4 and power distribution station 5, C three-phase line.
See Fig. 2, sampled signal processing unit 2 is mainly comprised of interface module 21, parameters of electric power computing module 22, CPU module 23, communication module 24 and power module 25.
Interface module 21 and parameters of electric power computing module 22 are provided with signal input part and signal output part respectively; CPU module 23 is provided with first signal input, secondary signal input and signal output part; Communication module 24 is provided with signal input part and signal output part.
The signal input part of interface module 21 is the signal input part of sampled signal processing unit 2; The first signal input of the signal output part of parameters of electric power computing module 22 and CPU module 23 is all electrically connected to the signal output part signal of interface module 21; The secondary signal input of CPU module 23 is electrically connected to the signal output part signal of parameters of electric power computing module 22; The signal input part of communication module 24 is electrically connected to the signal output part signal of CPU module 23; The signal output part of communication module 24 is the signal output part of sampled signal processing unit 2; Power module 25 provides working power for parameters of electric power computing module 22, CPU module 23 and communication module 24.
The core devices of CPU module 23 is the high-speed CPU of 64 floating type dominant frequency 150MHz, preferably adopts TMS320F28335 in its model the present embodiment.
See Fig. 3, control unit 3 is mainly comprised of second communication module 31, CPU control module 32, touch display screen 33, control signal output module 34 and second source module 35.
Second communication module 31 is provided with signal input part and signal output part; CPU control module 32 is provided with signal input part, interactive signal communication ends and signal output part; Touch display screen 33 is provided with signal communication ends; Control signal output module 34 is provided with signal input part and signal output part.
The signal input part of second communication module 31 is the signal input part of control unit 3; The signal input part of CPU control module 32 is electrically connected to the signal output part signal of second communication module 31; The signal communication ends of touch display screen 33 is electrically connected to the interactive signal communication ends two-way signaling of CPU control module 32; The signal input part of control signal output module 34 is electrically connected to the signal output part signal of CPU control module 32; The signal output part of control signal output module 34 is the signal output part of control unit 3; Other each modules that second source module 35 is control unit 3 provide working power.
The core devices of CPU control module 32 is the high-speed CPU of 64 floating type dominant frequency 150MHz, preferably adopts TMS320F28335 in its model the present embodiment.Touch display screen 33 adopts 7 inches of technical grade touch-screens of ARM9.Touch display screen 33 is for showing corresponding information and manually inputting relevant information for operating personnel.
See Fig. 4, because the sampled signal of signal sampling unit 1 is disturbed by strong electromagnetic conduct radiation in transport process, abundant noise has superposeed, in the present embodiment, in order to eliminate the adverse effect of noise, the voltage and current sample signal of 23 pairs of receptions of CPU module of sampled signal processing unit 2 adopts the meritorious idle decoupling zero based on wavelet filtering to control: first by the voltage signal U of collection and current signal I signal are carried out to wavelet transform DWT, carry out denoising, adopt again quadrature mirror filter (QMF) filtering, then by discrete wavelet inverse transformation IDWT reconstructed sample signal, finally to reconstruct voltage and current signal, gain merit idle decoupling zero is controlled, meritorious to realize accurate measurement, reactive current, and effectively remove meritorious, influencing each other of reactive current component, make system obtain good dynamic and control characteristic of steady state, realization is generated electricity by way of merging two or more grid systems and the functions such as the multi-functional flexible combination such as idle adjusting and reactive power compensation, improve the quality of power supply of electrical network, meet the scheduling controlling requirement of electrical network to photovoltaic plant.
The meritorious idle operation principle that can dispatching control device in the distributed photovoltaic power station of the present embodiment is summarized as follows:
The distributed photovoltaic power station of the present embodiment meritorious idle can dispatching control device (hereinafter to be referred as control device), for the combining inverter 4 to as distributed photovoltaic power generation unit with as the power distribution station 5 of electrical network power supply unit, regulate control.Combining inverter 4 at least arranges more than 1.Control device is gathered and the signal of collection is transferred to sampled signal processing unit 2 voltage of power distribution station 5 and inverter 4 tie points, electric current, the meritorious data such as idle by its signal sampling unit, the data such as 22 pairs of voltages relevant to power station vice president's outlet side quality of power supply of parameters of electric power computing module of sampled signal processing unit 2, electric current, meritorious, idle, power factor, frequency data, fundamental active power, basic reactive power are calculated accordingly and result are transferred to CPU module 23, CPU module 23 adopts the decoupling control policy based on wavelet filtering to be further processed data, draw the voltage relevant to the quality of power supply, electric current, meritorious, idle, power factor, frequency data, fundamental active power, the data such as basic reactive power, and be transferred to control unit 3, the data analysis of 32 pairs of receptions of CPU control module of control unit 3 is processed, service data by the inverter 4 with obtaining contrasts, judge the operation conditions of current distributed photovoltaic power station (combining inverter 4), and according to corresponding situation to the distributed power generation unit Reactive Power Dispatch of gaining merit, to realize the optimization operation of distributed power station system.
To sum up, the distributed photovoltaic power station of the present embodiment meritorious idle can dispatching control device, simple in structure, cost is lower, easy to install; Its sampled signal processing unit adopts the meritorious idle decoupling control method based on wavelet filtering, realization to the accurate measurement of meritorious, reactive current efficient solution except influencing each other between meritorious, reactive current, make system obtain good dynamic and control characteristic of steady state, realization is generated electricity by way of merging two or more grid systems and the functions such as the multi-functional flexible combination such as idle adjusting and reactive power compensation, improve the quality of power supply such as voltage, power factor of electrical network, meet the scheduling controlling requirement of electrical network to photovoltaic plant, so that electric power netting safe running.
Above embodiment is the explanation to embodiment of the present utility model; but not to restriction of the present utility model; person skilled in the relevant technique is not in the situation that departing from spirit and scope of the present utility model; can also make various conversion and variation and obtain the corresponding technical scheme being equal to, therefore all technical schemes that are equal to all should be included into scope of patent protection of the present utility model.
Claims (5)
- Distributed photovoltaic power station meritorious idle can a dispatching control device, it is characterized in that: comprise signal sampling unit (1), sampled signal processing unit (2) and control unit (3);Described signal sampling unit (1) is provided with sampled signal input and signal output part; Sampled signal processing unit (2) is provided with signal input part and signal output part; Control unit (3) is provided with signal input part and signal output part;The signal input part of sampled signal processing unit (2) is electrically connected to the signal output part signal of signal sampling unit (1); The signal input part of control unit (3) is electrically connected to the signal output part signal of sampled signal processing unit (2); During use, the sampled signal input of signal sampling unit (1) is electrically connected to the transmission information source of combining inverter (4) and power distribution station (5); The signal output part of control unit (3) is electrically connected to the control end control signal of combining inverter (4).
- Distributed photovoltaic according to claim 1 power station meritorious idle can dispatching control device, it is characterized in that: described sampled signal processing unit (2) comprises interface module (21), parameters of electric power computing module (22), CPU module (23), communication module (24) and power module (25);Described interface module (21) and parameters of electric power computing module (22) are provided with signal input part and signal output part respectively; CPU module (23) is provided with first signal input, secondary signal input and signal output part; Communication module (24) is provided with signal input part and signal output part;The signal input part of interface module (21) is the signal input part of sampled signal processing unit (2); The first signal input of the signal output part of parameters of electric power computing module (22) and CPU module (23) is all electrically connected to the signal output part signal of interface module (21); The secondary signal input of CPU module (23) is electrically connected to the signal output part signal of parameters of electric power computing module (22); The signal input part of communication module (24) is electrically connected to the signal output part signal of CPU module (23); The signal output part of communication module (24) is the signal output part of sampled signal processing unit (2); Power module (25) is that parameters of electric power computing module (22), CPU module (23) and communication module (24) provide working power.
- Distributed photovoltaic according to claim 2 power station meritorious idle can dispatching control device, it is characterized in that: described control unit (3) comprises second communication module (31), CPU control module (32), touch display screen (33), control signal output module (34) and second source module (35);Described second communication module (31) is provided with signal input part and signal output part; CPU control module (32) is provided with signal input part, interactive signal communication ends and signal output part; Touch display screen (33) is provided with signal communication ends; Control signal output module (34) is provided with signal input part and signal output part;The signal input part of second communication module (31) is the signal input part of control unit (3); The signal input part of CPU control module (32) is electrically connected to the signal output part signal of second communication module (31); The signal communication ends of touch display screen (33) is electrically connected to the interactive signal communication ends two-way signaling of CPU control module (32); The signal input part of control signal output module (34) is electrically connected to the signal output part signal of CPU control module (32); The signal output part of control signal output module (34) is the signal output part of control unit (3); Second source module (35) provides working power for other each modules of control unit (3).
- Distributed photovoltaic according to claim 3 power station meritorious idle can dispatching control device, it is characterized in that: the CPU module (23) of described sampled signal processing unit (2) comprises the high-speed CPU of 64 floating type dominant frequency 150MHz; The CPU control module (32) of control unit (3) comprises the high-speed CPU of 64 floating type dominant frequency 150MHz; Touch display screen (33) adopts 7 inches of technical grade touch-screens of ARM9.
- Distributed photovoltaic according to claim 4 power station meritorious idle can dispatching control device, it is characterized in that: the CPU module (23) of described sampled signal processing unit (2) is for adopting the module of the meritorious idle decoupling zero control based on wavelet filtering to the voltage and current signal of sampling.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475247A (en) * | 2013-09-18 | 2013-12-25 | 江苏省电力公司常州供电公司 | Active and reactive dispatchable control device of distributed photovoltaic power station |
| CN110690732A (en) * | 2019-09-26 | 2020-01-14 | 河海大学 | Photovoltaic reactive power partition pricing power distribution network reactive power optimization method |
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2013
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103475247A (en) * | 2013-09-18 | 2013-12-25 | 江苏省电力公司常州供电公司 | Active and reactive dispatchable control device of distributed photovoltaic power station |
| CN103475247B (en) * | 2013-09-18 | 2016-07-06 | 江苏省电力公司常州供电公司 | Distributed photovoltaic power station active reactive schedulable controls device |
| CN110690732A (en) * | 2019-09-26 | 2020-01-14 | 河海大学 | Photovoltaic reactive power partition pricing power distribution network reactive power optimization method |
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