CN110739703A - current lead intervention algorithm, resonance treatment method and system - Google Patents
current lead intervention algorithm, resonance treatment method and system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The invention provides current leading intervention algorithms, which are characterized in that waveform sampling of system voltage and current is performed through a computing unit, and fundamental current THDI is calculated by utilizing DFT algorithm13 th harmonic current THDI35 th harmonic current THDI57 th harmonic current THDI711 th harmonic current THDI1113 th harmonic current THDI1315 th harmonic current THDI15Comparing the data with calculated by the first times of sampling, judging that harmonic current components corresponding to sudden increase of data have a tendency of causing resonance when the data suddenly increases, repeating the above process, which is beneficial to resonance treatment, resonance treatment methods which are beneficial to improving the quality of a power grid, and systems which operate the resonance treatment methodThe method is carried out.
Description
Technical Field
The invention relates to the technical field of resonance treatment methods of power distribution systems, in particular to an current lead intervention algorithm, a resonance treatment method and a resonance treatment system.
Background
Resonance is an important harmful factor in a power distribution system, and for the treatment of resonance, the resonance is an important influence factor for whether a power grid works well, so that important consideration needs to be given.
In view of the above problems, the applicant aims to make further research on a compensation hybrid system of the SVG/APF + smart capacitor, aiming to improve the quality of the power grid by improving the resonance processing.
Disclosure of Invention
The technical problems to be solved by the invention are that current advanced intervention algorithms are provided to overcome the defects of the prior art, which is beneficial to resonance treatment, resonance treatment methods are provided to be beneficial to improving the quality of a power grid, and systems are provided to operate the resonance treatment methods.
In order to solve the technical problem, the invention provides current lead intervention algorithms, which are used for sampling the waveform of the system voltage and current through a computing unit and calculating the fundamental current THDI by utilizing a DFT algorithm 13 th harmonic current THDI 35 th harmonic current THDI57 th harmonic current THDI711 th harmonic current THDI1113 th harmonic current THDI1315 th harmonic current THDI15Comparing the data with data calculated by the first times of sampling, judging that harmonic current components corresponding to sudden increase of times of sampling have the tendency of causing resonance when the data suddenly increases, and repeating the process.
After adopting the structure, compared with the prior art, the invention has the following advantages: the DFT algorithm is Discrete Fourier Transform (DFT). After the improvement, the resonance point can be found in time, so that the opportunity of advanced intervention is obtained, the harmonic current is prevented from being amplified continuously, the resonance is prevented from being generated continuously, and the resonance treatment is facilitated.
In order to solve the technical problems, resonance treatment methods are also provided, the waveform of the system voltage and current is sampled by a control unit, and the fundamental current THDI is calculated by using DFT algorithm 13 th harmonic current THDI 35 th harmonic current THDI57 th harmonic current THDI711 th harmonic current THDI1113 th harmonic current THDI1315 th harmonic current THDI15Comparing the data with data calculated by the first times of sampling, comparing the data with data calculated by the first times of sampling when data suddenly increases, and cutting off at least intelligent capacitors according to the harmonic current corresponding to the suddenly increased data during the sampling when data suddenly increases, namely when the harmonic current has an amplification trend, the control unit controls to cut off intelligent capacitors with the minimum capacity, if the harmonic current has the amplification trend, the control unit continues to cut off intelligent capacitors with the minimum capacity, and so on until the condition of generating resonance is destroyed, and the resonance is prevented from generating.
After the structure is adopted, compared with the prior art, the method has the advantages that the DFT algorithm is Discrete Fourier Transform (DFT), after the improvement, the resonance point when the resonance occurs is found in time, and the original resonance point is damaged by cutting off at least intelligent capacitors, so that the opportunity of advanced intervention is simply and efficiently utilized, the continuous amplification of harmonic current is avoided, the continuous occurrence of the resonance is prevented, the resonance can be effectively managed, and the quality of a power grid is improved.
In order to solve the technical problems, the low-voltage reactive power compensation series-parallel system comprises a static reactive power generator, a th current detection unit for detecting a power grid and a plurality of intelligent capacitors, wherein the static reactive power generator is provided with a control unit, and the plurality of intelligent capacitors form an intelligent capacitor bank, and the system is characterized in that a compensation end of the static reactive power generator and compensation ends of the intelligent capacitors are respectively and electrically connected with the power grid, a control unit of the static reactive power generator is marked as a th control unit, a control unit of each intelligent capacitor is marked as a second control unit, communication ends of the second control units are respectively and electrically connected with a communication end of a th control unit, and a th sampling end of a th control unit is electrically connected with a th current detection unit.
After the structure is adopted, compared with the prior art, the intelligent capacitor system has the advantages that the intelligent capacitor system is composed of static var generators and a plurality of intelligent capacitors, the static var generators sample on the system side through a th current detection unit to find resonance points in time, and the static var generators are directly communicated with the intelligent capacitor bank to perform data interaction, so that the intelligent capacitor bank is quickly controlled to destroy the resonance points, resonance can be efficiently managed, reactive compensation is more reasonable, ordered and accurate, and therefore the quality of a power grid is favorably improved.
As an improvement, the intelligent capacitor bank compensation device further comprises a second current detection unit used for monitoring the compensation capacity of the intelligent capacitor bank, and a second sampling end of the th control unit is electrically connected with the second current detection unit, so that the second current detection unit samples on the compensation side of the intelligent capacitor to monitor the compensation capacity of the intelligent capacitor bank, and the second current detection unit collects current signals compensated by the intelligent capacitor bank, so that compensation is more refined.
As an improvement, the static var generator comprises a control unit, an th current sampling unit, a second current sampling unit, a capacitor, a reactor, an IGBT module, a display module, a 485 communication switching unit and a telephone line socket switching unit, wherein the th current sampling unit is provided with a th sampling end, and the second current sampling unit is provided with a second sampling end, so that optimal schemes are provided, the requirement for quick communication is met, and the conventional static var generator is conveniently transformed to obtain the structure.
As an improvement, the 485 communication switching unit includes a 485 communication module, the 485 communication module is provided with a data transmission channel and a data selection channel, and outputs two 485 communication ports, the data transmission channel and the data selection channel are respectively and directly electrically connected to the signal end of the control unit, the two 485 communication ports are respectively and electrically connected to a telephone line socket switching unit, the telephone line socket switching unit is provided with an telephone line socket and a second telephone line socket, the /second telephone line socket of the telephone line socket switching unit is used for electrically connecting an intelligent capacitor, the telephone line socket switching unit is used for converting the signals of the two 485 communication ports into compatible signals of the telephone line socket, thus, preferred schemes are provided, which is beneficial to simplifying the setting, realizing the compatibility, and simultaneously is more beneficial to the rapid transmission of the signals.
As an improvement, the 485 communication switching unit and the control unit are arranged on the same circuit boards, and the telephone line socket switching unit is arranged on the other circuit boards, so that preferred schemes are provided, the arrangement is simplified, and the signal is transmitted quickly.
As a modification, the other circuit boards are arranged in the shell of the control box of the static var generator and expose the telephone line socket, so that the integration level is improved, and the connection of the intelligent capacitor is facilitated.
As an improvement, the control unit comprises a main chip and an auxiliary chip, the main chip and the auxiliary chip are electrically connected to realize mutual communication, the main chip adopts a chip with a model of TMS320F2812, the auxiliary chip adopts a chip with a model of EP1C6Q240C8, and the 485 communication module adopts a communication module with a model of TD301D 485H; the data transmission channel and the data selection channel are respectively and directly electrically connected with the signal end of the control unit, namely the data transmission channel is electrically connected with the RO signal end of the EP1C6Q240C8 chip, and the data selection channel is electrically connected with the CS signal end of the EP1C6Q240C8 chip, so that the operation speed is high, the matching degree is better, and the response is fast.
As an improvement, two 485 communication ports are respectively marked as a 485A communication port and a 485B communication port, an end of the 485A communication port is electrically connected with an A end of a communication module TD301D485H, a end of the 485B communication port is electrically connected with a B end of the communication module TD301D485H, the 485A communication port is connected with a th resistor in series, the 485B communication port is connected with a second resistor in series, a th bidirectional voltage stabilizing tube and a third resistor are also connected between the 485A communication port and the 485B communication port in parallel, and a common end of the th bidirectional voltage stabilizing tube and the third resistor which are connected in parallel is positioned behind the th resistor and the second resistor, so that optimal schemes are provided, signal transmission is stable and reliable, and response is facilitated to be fast.
Drawings
Fig. 1 is a schematic diagram of low-voltage reactive compensation series-parallel connection systems according to the invention.
Fig. 2 is a schematic structural diagram of a control box of the static var generator used in fig. 1.
Fig. 3 is a schematic circuit diagram of the 485 communication switching unit.
Shown in the figure are a 1 st th telephone line socket, a 2 nd telephone line socket.
Detailed Description
The invention is described in further detail at step :
the low-voltage reactive power compensation series-parallel system comprises a static reactive power generator, a current detection unit for detecting a power grid, a plurality of intelligent capacitors and a second current detection unit for monitoring the compensation capacity of the intelligent capacitor bank, wherein a compensation end of the static reactive power generator and a compensation end of each intelligent capacitor are respectively and electrically connected with the power grid, a control unit of the static reactive power generator is marked as a control unit, a control unit of each intelligent capacitor is marked as a second control unit, a communication end of each second control unit is respectively and electrically connected with a communication end of a control unit, a sampling end of a control unit is electrically connected with a current detection unit, a second sampling end of a control unit is electrically connected with a second current detection unit, the intelligent capacitor bank is formed by connecting the intelligent capacitors in parallel, and when the related structures such as the second current detection unit and the like do not exist, low-voltage reactive power compensation series-parallel system can also run the resonance abatement method disclosed by the invention, and when the related structures such as the second current detection unit and the related structures of the low-voltage reactive power compensation series-parallel system are adopted, the reactive power compensation system has better performance.
The intelligent capacitor mainly comprises a control unit, a circuit breaker, a capacitor, a reactor and a magnetic latching relay, wherein the control unit is a second control unit. The intelligent capacitor can adopt a resonance suppression type low-voltage reactive power compensation device sold in the market, such as a product produced and sold by Zhejiang sanditai electric limited company.
The plurality of intelligent capacitors may include an intelligent co-compensation capacitor and an intelligent sub-compensation capacitor.
The static reactive generator comprises a control unit, a th current sampling unit, a second current sampling unit, a capacitor, an electric reactor, an IGBT module, a display module, a 485 communication switching unit and a telephone line socket switching unit, wherein the th current sampling unit is provided with a th sampling end, the second current sampling unit is provided with a second sampling end, the 485 communication switching unit comprises a 485 communication chip, the 485 communication module is provided with a data transmission channel and a data selection channel and outputs two 485 communication ports, the data transmission channel and the data selection channel are respectively and directly and electrically connected with a signal end of the control unit, the two 485 communication ports are respectively and electrically connected with the telephone line socket switching unit, the telephone line socket switching unit is provided with a th telephone line socket and a second telephone line socket, the th/second telephone line socket of the socket switching unit is used for electrically connecting the intelligent capacitor, and the telephone line socket switching unit is used for converting signals of the two 485 communication ports into compatible signals of the telephone line.
The th current detection unit can adopt a current transformer for detection, called CT for short, the current transformer is arranged on the side of the power grid and can be called grid side CT, signals acquired by the grid side CT are transmitted to the th current sampling unit for processing and then transmitted to the th control unit, the second current detection unit can adopt the current transformer for detection, namely the current transformer is arranged on a compensation circuit connected with the power grid of the intelligent capacitor bank, the signals acquired by the current transformer are transmitted to the th control unit for processing and then transmitted to the th current sampling unit and the second current sampling unit can adopt the existing signal conditioning circuit, and details are not repeated.
The current signal compensated by the intelligent capacitor bank is acquired through the second current detection unit, the reactive current effective value output by the intelligent capacitor bank is calculated by adopting DFT, then the reactive current effective value output by the SVG is added, the summation value is subtracted from the total reactive power of compensation, and the reactive current required by compensation is obtained, so that the reactive current required by the SVG for compensating the residual reactive power is controlled, and the compensation target is reached.
The static var generator can be obtained by improvement on the basis of the existing SVG, the existing SVG can adopt a commercial static var generator, such as a product produced and sold by Zhejiang Chengtai electric limited company, the existing SVG consists of a control unit, a current sampling unit, a capacitor, a reactor, an IGBT module and a display module, and after improvement, the control box of the existing SVG is reformed into a control box shown in figure 2, so that two paths of telephone line jacks, namely an telephone line jack 1 and a second telephone line jack 2, are obviously added.
The telephone line socket switching unit can adopt the prior art, and is not described in detail, namely the 485 communication is switched to the telephone line and can adopt the prior art, and a 6-core 485 communication line is used, the th telephone line socket 1 and the second telephone line socket 2 are connected in parallel, when the telephone line socket switching unit is used, the th telephone line socket 1 can be plugged, the second telephone line socket 2 can also be plugged, and transmitted signals are the same.
The 485 communication switching unit and the control unit are arranged on the same circuit boards, and the telephone line socket switching unit is arranged on the other circuit boards.
The other circuit boards are arranged in the shell of the control box of the static var generator and expose two telephone line sockets.
The control unit comprises a main chip and an auxiliary chip, the main chip and the auxiliary chip are electrically connected to realize mutual communication, the main chip adopts a chip with a model of TMS320F2812, the auxiliary chip adopts a chip with a model of EP1C6Q240C8, the 485 communication module adopts a communication module with a model of TD301D485H, the data transmission channel and the data selection channel are respectively and directly electrically connected with the signal end of the control unit, namely the data transmission channel is electrically connected with the RO signal end of the EP1C6Q240C8 chip, and the data selection channel is electrically connected with the CS signal end of the EP1C6Q240C8 chip, as shown in fig. 3, the schematic side of the EP1C6Q240C8 chip is simply drawn in the figure.
As shown in fig. 3, two 485 communication ports are respectively marked as a 485A communication port and a 485B communication port, the end of the 485A communication port is electrically connected with the a end of the communication module TD301D485H, the end of the 485B communication port is electrically connected with the B end of the communication module TD301D485H, the 485A communication port is connected in series with a th resistor, the 485B communication port is connected in series with a second resistor, a th bidirectional voltage-stabilizing tube and a third resistor are further connected in parallel between the 485A communication port and the 485B communication port, and the common ends of the th bidirectional voltage-stabilizing tube and the third resistor which are connected in parallel are located behind the th resistor and the second resistor.
The communication end of each second control unit is electrically connected with the communication end of the th control unit respectively, that is, each intelligent capacitor is provided with accessed telephone line sockets and switched telephone line sockets, the telephone line socket of the static var generator is electrically connected with the accessed telephone line socket of intelligent capacitors, and the switched telephone line socket of the intelligent capacitor is electrically connected with the accessed telephone line socket of intelligent capacitors, so that the communication between the th control unit and each second control unit is realized through sequential plugging.
SVG, certainly, APF with reactive compensation ability also can use, APF is called active filter, SVG can use with APF equally, each intelligent capacitor communicates with SVG, intelligent capacitor sends the state information of oneself for SVG, SVG learns the switching condition of each intelligent capacitor according to the state information who sends and come, SVG passes through net side CT and gathers current signal in real time, then sends to the controller of SVG, and calculate and control.
The states of the intelligent capacitor comprise networking addresses, capacitor temperature, switching states of relays, fault states of the intelligent capacitor and out-of-limit states of the intelligent capacitor, wherein the out-of-limit states comprise four state conditions of overvoltage, undervoltage, undercurrent and overtemperature.
And each intelligent capacitor is communicated with the SVG by 485 communication with the baud rate of 19200.
Calculating by using DFT algorithm: fundamental current THDI 13 th harmonic current THDI 35 th harmonic current THDI57 th harmonic current THDI711 th harmonic current THDI1113 th harmonic current THDI1315 th harmonic current THDI15Comparing the data with data calculated by first times of sampling, when data suddenly increases, cutting off at least intelligent capacitors according to the harmonic current corresponding to the suddenly increasing data during the sampling, namely when the harmonic current has the tendency of amplification, the control unit controls to cut off intelligent capacitors with minimum capacity, if the harmonic current has the tendency of amplification, continuously cut off intelligent capacitors with minimum capacity, and so on until the condition of breaking the resonance occurrence is reached, and the resonance is prevented from occurring5And when the voltage is suddenly increased, the resonance can be judged to happen, and at the moment, intelligent capacitors are cut off, so that the capacitance value in a system loop is changed, the LC proportion in the loop is changed, the 5 th harmonic current is prevented from being continuously amplified, and the resonance is prevented from continuing to happen.
The above description is only a preferred embodiment of the present invention, and all equivalent changes or modifications of the structure, characteristics and principles described in the present invention are included in the scope of the present invention.
Claims (10)
1, current lead intervention algorithm, which is characterized in that waveform sampling of system voltage and current is performed by a computing unit, and fundamental current THDI is calculated by DFT algorithm13 rd harmonicWave current THDI35 th harmonic current THDI57 th harmonic current THDI711 th harmonic current THDI1113 th harmonic current THDI1315 th harmonic current THDI15Comparing the data with data calculated by the first times of sampling, judging that harmonic current components corresponding to sudden increase of times of sampling have the tendency of causing resonance when the data suddenly increases, and repeating the process.
2, resonance treatment method using current lead intervention algorithm as claimed in claim 1, wherein the waveform of system voltage and current is sampled by the control unit, and the DFT algorithm is used to calculate the fundamental current THDI13 th harmonic current THDI35 th harmonic current THDI57 th harmonic current THDI711 th harmonic current THDI1113 th harmonic current THDI1315 th harmonic current THDI15Comparing the data with data calculated by first times of sampling, when data suddenly increases, cutting off at least intelligent capacitors according to the harmonic current corresponding to the suddenly increased data during the sampling, namely when the harmonic current has an amplification trend, the controller controls to cut off intelligent capacitors with the minimum capacity, if the harmonic current has the amplification trend, continuously cut off intelligent capacitors with the minimum capacity, and so on until the condition of breaking the resonance occurrence is reached, and the resonance is prevented from occurring.
3, low-voltage reactive power compensation series-parallel system capable of operating the resonance abatement method of claim 2, comprising a static reactive power generator, a th current detection unit for detecting the power grid, and a plurality of intelligent capacitors, wherein the static reactive power generator is provided with a control unit, the plurality of intelligent capacitors form an intelligent capacitor bank, and the compensation terminal of the static reactive power generator and the compensation terminal of each intelligent capacitor are electrically connected with the power grid respectively, the control unit of the static reactive power generator is marked as a th control unit, the control unit of each intelligent capacitor is marked as a second control unit, the communication terminal of each second control unit is electrically connected with the communication terminal of a th control unit respectively, and the th sampling terminal of the th control unit is electrically connected with an th current detection unit.
4. The low-voltage reactive power compensation series-parallel connection system according to claim 3, further comprising a second current detection unit for monitoring the compensation capacity of the intelligent capacitor bank, wherein the second sampling terminal of the th control unit is electrically connected with the second current detection unit.
5. The low-voltage reactive power compensation series-parallel connection system according to claim 4, wherein the static var generator comprises a control unit, an th current sampling unit, a second current sampling unit, a capacitor, a reactor, an IGBT module, a display module, a 485 communication switching unit and a telephone line socket switching unit, wherein the th current sampling unit is provided with a th sampling end, and the second current sampling unit is provided with a second sampling end.
6. The low-voltage reactive compensation series-parallel connection system according to claim 5, wherein the 485 communication switching unit comprises a 485 communication module, the 485 communication module is provided with a data transmission channel and a data selection channel, and outputs two 485 communication ports, the data transmission channel and the data selection channel are respectively and directly electrically connected with the signal end of the control unit, the two 485 communication ports are respectively and electrically connected with a telephone line socket switching unit, the telephone line socket switching unit is provided with an th telephone line socket and a second telephone line socket, the /second telephone line socket of the telephone line socket switching unit is used for electrically connecting the intelligent capacitor, and the telephone line socket switching unit is used for converting signals of the two 485 communication ports into compatible signals of the telephone line socket.
7. The low-voltage reactive power compensation series-parallel connection system according to claim 6, wherein the 485 communication switching unit and the control unit are arranged on the same circuit boards, and the telephone line socket switching unit is arranged on the other circuit boards.
8. The low-voltage reactive power compensation series-parallel connection system according to claim 7, wherein the other circuit boards are arranged in a housing of a control box of the static var generator and expose telephone line sockets.
9. The low-voltage reactive compensation series-parallel connection system according to claim 3, wherein the control unit comprises a main chip and an auxiliary chip, the main chip and the auxiliary chip are electrically connected to realize mutual communication, the main chip adopts a chip with a model of TMS320F2812, the auxiliary chip adopts a chip with a model of EP1C6Q240C8, and the 485 communication module adopts a communication module with a model of TD301D 485H; the data transmission channel and the data selection channel are respectively and directly electrically connected with the signal end of the control unit, that is, the data transmission channel is electrically connected with the RO signal end of the EP1C6Q240C8 chip, and the data selection channel is electrically connected with the CS signal end of the EP1C6Q240C8 chip.
10. The low-voltage reactive compensation series-parallel system of claim 9, wherein two 485 communication ports are respectively marked as a 485A communication port and a 485B communication port, an terminal of the 485A communication port is electrically connected with an a terminal of a communication module TD301D485H, a terminal of the 485B communication port is electrically connected with a B terminal of the communication module TD301D485H, the 485A communication port is connected with a th resistor in series, the 485B communication port is connected with a second resistor in series, a th bidirectional voltage-stabilizing tube and a third resistor are further connected in parallel between the 485A communication port and the 485B communication port, and common terminals of the th bidirectional voltage-stabilizing tube and the third resistor in parallel are located behind the th resistor and the second resistor.
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| CN116316620A (en) * | 2023-03-17 | 2023-06-23 | 大交新能源技术(上海)有限责任公司 | Intelligent ordering algorithm for avoiding resonance in electric power hybrid compensation system |
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