CN111181168A - Novel low-pressure hybrid compensation method and system - Google Patents

Novel low-pressure hybrid compensation method and system Download PDF

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CN111181168A
CN111181168A CN202010029754.5A CN202010029754A CN111181168A CN 111181168 A CN111181168 A CN 111181168A CN 202010029754 A CN202010029754 A CN 202010029754A CN 111181168 A CN111181168 A CN 111181168A
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current
compensation
control unit
host
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CN111181168B (en
Inventor
金仁云
胡苏剑
许金彤
韩荣杰
王鹏程
黄吾康
潘圆君
潘珲
潘国荣
张永军
李肖军
孙栋梁
古永富
姚芳芳
傅浩峰
周艳
张驰
马妍
李俊斐
孙浩然
金日宏
吴顺利
金磊
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Hangzhou Electric Power Equipment Manufacturing Co Ltd Xiaoshan Xin Mei Complete Set Of Electrical Manufacturing Branch
Zhejiang Shengtai Electric Co ltd
Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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Hangzhou Electric Power Equipment Manufacturing Co Ltd Xiaoshan Xin Mei Complete Set Of Electrical Manufacturing Branch
Zhejiang Shengtai Electric Co ltd
Hangzhou Power Supply Co of State Grid Zhejiang Electric Power Co Ltd
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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
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
    • 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
    • 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
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1842—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein at least one reactive element is actively controlled by a bridge converter, e.g. active filters
    • 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
    • Y02E40/10—Flexible AC transmission systems [FACTS]
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Electrical Variables (AREA)

Abstract

The invention provides a novel low-voltage hybrid compensation method, wherein one SVG is used as a host, the other SVGs and APFs are used as slaves, a smart capacitor sends own state information to the host SVG, the host SVG learns the compensation condition of each smart capacitor according to the sent state information, the host SVG samples a power grid, and the host SVG implements control, and the method comprises the following processes: 1) if the capacity of the first APF can not meet the harmonic current compensation capacity, the second APF will execute the residual harmonic current compensation, and so on. 2) The first control unit of the host SVG calculates the effective value of the current by using the DFT algorithm according to the collected current waveform, and then deduces the magnitude of the reactive current; in the input process, the reactive current needing to be compensated is recorded as Q input total, and the host SVG distributes the compensation capacity of the intelligent capacitor and the master-slave SVG; in the cutting process, the reactive current needing to be cut is recorded as Q cut total, and the host SVG distributes the compensation capacity of the intelligent capacitor and the master and slave SVG; has the advantages of achieving the purposes of reasonability, economy and effectiveness.

Description

Novel low-pressure hybrid compensation method and system
Technical Field
The invention relates to the technical field of power quality management, in particular to a novel low-voltage hybrid compensation method and system.
Background
In the electrification process of the 21 st century, various load devices are in a large range, the requirement on the power environment of the whole power distribution network is higher and higher, the problems of low power factor, large harmonic current and three-phase imbalance become the largest killer of the quality of electric energy in the current low-voltage power distribution network, and comprehensive treatment of reactive power and harmonic wave is undoubtedly the primary task for solving the problem of the quality of the electric energy.
For reactive compensation, at present, the stepped compensation is mainly based on an intelligent capacitor, and the stepped compensation has the advantages of convenient installation, simple operation, advanced compensation technology, mainly based on a co-compensation intelligent capacitor, and refined reactive compensation is mainly based on a Static Var Generator (SVG), and has the advantages of inductive and capacitive reactive bidirectional compensation, continuity of compensation capacity and high compensation precision.
Aiming at harmonic filtering, an Active Power Filter (APF) is mainly adopted in the market, the design principle is that reverse current harmonic is sent out to compensate harmonic generated in a Power grid, and therefore the harmonic content is guaranteed to meet the national standard on the grid side.
In view of the problems and higher requirements of quality control of the low-voltage power grid, the applicant aims to further research a power hybrid compensation method for reactive compensation and harmonic filtering in the low-voltage power grid, namely a novel low-voltage hybrid compensation method, so as to be capable of: the compensation thinking of unified electric energy quality control of design can carry out real-time reactive compensation and harmonic according to on-the-spot concrete electric parameters and administer, the reactive compensation capacity of rational distribution intelligent capacitor and SVG and APF's harmonic filtering size, make quick filtering response to harmonic current to in time adjust three-phase current size according to three-phase unbalance, through the problem of solving reactive compensation and harmonic and administering in a centralized manner, reach reasonable, economy, effectual purpose.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provide a novel low-voltage hybrid compensation method, design a unified compensation idea for power quality management, perform real-time reactive compensation and harmonic management according to specific on-site power parameters, reasonably distribute the reactive compensation capacity of an intelligent capacitor and SVG, make quick filtering response aiming at harmonic current, timely adjust the three-phase current according to the three-phase unbalance degree, and achieve the purposes of reasonableness, economy and effectiveness by intensively solving the problems of reactive compensation and harmonic management.
Also provides a novel low-voltage hybrid compensation system, which can balance the cost reduction and the high-quality electric energy treatment capacity.
In order to solve the technical problem, the invention provides a novel low-pressure hybrid compensation method which comprises the following steps:
to each SVG and active filter people for setting for communication address, SVG and active filter are SVG and APF for short respectively, the smart capacitor is for network deployment from network deployment mode, regard as the host computer with one of them SVG, remaining SVG and APF are as follows the machine, the smart capacitor sends the state information of oneself for host computer SVG, the compensation condition of each smart capacitor is known according to the state information of sending to host computer SVG, host computer SVG samples the electric wire netting, control is implemented to host computer SVG, the process that contains as follows:
1) the first control unit of the host SVG calculates the current magnitude of each odd harmonic by using DFT algorithm according to the collected current waveform, and records 3 times of harmonic current THDI35 th harmonic current THDI57 th harmonic current THDI711 th harmonic current THDI1113 th harmonic current THDI1315 th harmonic current THDI15And so on; and then the host SVG transmits the harmonic current to be compensated to the APF through 485 communication, the APF controls and outputs the current of corresponding times after receiving the command, if the capacity of the first APF can not meet the compensation capacity of the harmonic current, the second APF executes the compensation of the residual harmonic current, and the like.
2) The first control unit of the host SVG calculates the effective value of the current by using the DFT algorithm according to the collected current waveform, and then deduces the magnitude of the reactive current;
in the input process, the reactive current needed to be compensated is recorded as Q input total, the host SVG distributes the compensation capacity of an intelligent capacitor and a master-slave SVG, the intelligent capacitor is input according to the strategy of ' graded input ', ' high capacity input is prioritized ', then low capacity input ' is carried out, the capacity which the intelligent capacitor needs to compensate is recorded as Qc total, the reactive current which the master SVG and the slave SVG need to compensate is Qs-Q input total-Qc total, then the compensation current of each part is calculated, and the switching command of each part is sent to the intelligent capacitor within 0-1 s; after receiving the command, the intelligent capacitor conducts traversal query or traversal query and repeated verification to find the command belonging to the address of the intelligent capacitor, and then corresponding action is conducted according to the command;
in the cutting process, the reactive current needing to be cut is recorded as Q-cut total, the host SVG distributes the compensation capacity of the intelligent capacitor and the SVG of the master and slave machines, the cutting strategy of the intelligent capacitor follows a strategy opposite to that of putting in, the capacity which the intelligent capacitor needs to be cut is recorded as Qc, the reactive current which the SVG of the master and slave machines needs to compensate is Qs-Q-cut total-Qc, then after the compensation current of each part is calculated, the switching command of each part is sent to the intelligent capacitor within 0-1 s, after the intelligent capacitor receives the command, traversal query or traversal query can be carried out, repeated verification is combined, the command which belongs to the address of the intelligent capacitor is found, and then corresponding action is carried out according to the command.
After adopting the structure, compared with the prior art, the invention has the following advantages: the method is a unified compensation idea of power quality management, can perform real-time reactive compensation and harmonic management according to specific power parameters on site, reasonably distributes reactive compensation capacity of intelligent capacitors and SVG, makes quick filtering response aiming at harmonic current, timely adjusts the size of three-phase current according to three-phase unbalance, and achieves the purposes of reasonableness, economy and effectiveness by intensively solving the problems of reactive compensation and harmonic management.
As improvement, the intelligent capacitor has a self-detection compensation current function, current information compensated by the intelligent capacitor is transmitted to the host SVG through self-detection, and the host SVG distributes reactive compensation capacity of the slave SVG through recalculating compensation current of the intelligent capacitor, so that compensation precision is higher.
In order to solve the technical problems, the invention provides a novel low-voltage hybrid compensation system which comprises an active filter, a static var generator, a first current detection unit for detecting a power grid and intelligent capacitors, wherein each intelligent capacitor forms an intelligent capacitor bank; the static var generator comprises a master static var generator and at least one slave static var generator, wherein a control unit of the master static var generator is marked as a first control unit, a control unit of each intelligent capacitor is marked as a second control unit, and a control unit of the slave static var generator and a control unit of the active filter are marked as a third control unit; the first sampling end of the first control unit is electrically connected with the first current detection unit, the communication end of each second control unit is electrically connected with the communication end of the first control unit, and the communication end of the first control unit is electrically connected with the communication end of each third control unit; each intelligent capacitor adopts a complementary capacitor with a self-detection complementary current function.
After adopting the structure, compared with the prior art, the invention has the following advantages: the whole system only adopts a group of first current detection units for detecting the power grid, the compensation current is transmitted to the first control unit in a mode of adopting a co-compensation type capacitor with a self-detection current-supplementing function and respectively electrically connecting the communication end of each second control unit with the communication end of the first control unit, namely, the compensation current is transmitted to the host static var generator, and the cost of externally adding the current detection units is greatly saved; through master-slave arrangement, the system can control a plurality of static var generators and active filters, the compensation capacity of the static var generators is expanded on the basis of the original single static var generator, the hardware capability of expanding the original low-order and small-order harmonic filtering to the full-order harmonic filtering is realized, and the capacity and the frequency of harmonic filtering are increased; the whole system cancels the original sub-compensation intelligent capacitor, and has a plurality of static var generators due to the master-slave arrangement, so that the static var generators can serve as the sub-compensation capacitor, and the problem of three-phase imbalance is solved well. In a word, a certain balance is achieved between cost reduction and the ability to provide superior power management.
As improvement, each co-compensation capacitor adopts an ad hoc network communication structure for networking, so that the networking structure is simplified, and the cost is reduced.
As an improvement, each complementary capacitor adopts a capacitor with adjustable three-gear communication speed, and the three-gear communication speed is respectively the baud rate 19200, the baud rate 9600 and the baud rate 4800, so that three choices are provided, the adjustment according to the actual environment is facilitated, and the better adaptability is realized.
As an improvement, the communication end of each second control unit is electrically connected to the communication end of the first control unit, and the electrical connection between the communication end of the first control unit and the communication end of each third control unit means: the static var generator of the host comprises two paths of 485 communication, one path of communication is in communication connection with the communication end of the adjacent second control unit, the adjacent second control units are in communication connection through a series communication connection structure, the other path of communication is in communication connection with the communication end of the adjacent third control unit, and the adjacent third control units are in communication connection through a series communication connection structure.
As improvement, the first current detection unit adopts a CT serial sampling structure, and the CT refers to a current transformer, so that the structure is simple, stable and reliable.
Drawings
Fig. 1 is a schematic diagram of a novel low-pressure hybrid compensation system according to the present invention.
Fig. 2 is a schematic block diagram of a novel low-pressure hybrid compensation method according to the present invention.
Detailed Description
The invention is described in further detail below:
the invention discloses a novel low-pressure hybrid compensation method, and fig. 2 is a rough schematic diagram to help understanding the general control flow of the method:
for convenience of description, the Static Var Generator is abbreviated as SVG (Static Var Generator), and the Active Filter is abbreviated as APF (Active Power Filter).
To each SVG and APF artificial settlement communication address (manual coding address that carries out), intelligent capacitor (the capacitor is mended altogether) is for the ad hoc network mode (independently form local address), regard as the host computer with one of them SVG, remaining SVG and APF are as from the machine, each intelligent capacitor communicates through the mode of establishing ties 485 and host computer SVG, intelligent capacitor sends the state information of oneself for host computer SVG, host computer SVG learns the compensation condition of each intelligent capacitor according to the state information who sends and comes, host computer SVG passes through outside CT series connection sampling (first current detection unit), control is implemented to host computer SVG, the process that contains as follows:
1) the first control unit of the host SVG calculates the current magnitude of each odd harmonic by using DFT algorithm according to the collected current waveform, and records 3 times of harmonic current THDI35 th harmonic current THDI57 th harmonic current THDI711 th harmonic current THDI1113 th harmonic current THDI1315 th harmonic current THDI15And so on; and then the host SVG transmits the harmonic current to be compensated to the APF through 485 communication, the APF controls and outputs the current of corresponding times after receiving the command, if the capacity of the first APF can not meet the compensation capacity of the harmonic current, the second APF executes the compensation of the residual harmonic current, and the like.
2) The first control unit of the host SVG calculates the effective value of the current by using the DFT algorithm according to the collected current waveform, and then deduces the magnitude of the reactive current;
in the input process, the reactive current needed to be compensated is recorded as Q input total, the host SVG distributes the compensation capacity of an intelligent capacitor and a master-slave SVG, the intelligent capacitor is input according to the strategy of ' graded input ', ' high capacity input is prioritized ', then low capacity input ' is carried out, the capacity which the intelligent capacitor needs to compensate is recorded as Qc total, the reactive current which the master SVG and the slave SVG need to compensate is Qs-Q input total-Qc total, then the compensation current of each part is calculated, and the switching command of each part is sent to the intelligent capacitor within 0-1 s; after receiving the command, the intelligent capacitor conducts traversal query or traversal query and repeated verification to find the command belonging to the address of the intelligent capacitor, and then corresponding action is conducted according to the command; when the SVG is put into operation, the reactive compensation capacity between the master SVG and the slave SVG is distributed according to an average distribution mode, when N SVGs exist in total, the total capacity needing SVG compensation is Qs, and the compensation capacity of each SVG is Qs/N.
In the cutting process, the reactive current needing to be cut is recorded as Q-cut total, the host SVG distributes the compensation capacity of the intelligent capacitor and the SVG of the master and slave machines, the cutting strategy of the intelligent capacitor follows a strategy opposite to that of putting in, the capacity which the intelligent capacitor needs to be cut is recorded as Qc, the reactive current which the SVG of the master and slave machines needs to compensate is Qs-Q-cut total-Qc, then after the compensation current of each part is calculated, the switching command of each part is sent to the intelligent capacitor within 0-1 s, after the intelligent capacitor receives the command, traversal query or traversal query can be carried out, repeated verification is combined, the command which belongs to the address of the intelligent capacitor is found, and then corresponding action is carried out according to the command. When the SVGs are cut, the reactive compensation capacity between the master SVG and the slave SVG is distributed in an average distribution mode, when N SVGs exist in total, the total capacity needing to be cut by the SVGs is Qs, and the cutting capacity of each SVG is Qs/N.
The DFT algorithm, namely Discrete Fourier Transform (DFT), is not described in detail.
The intelligent capacitor bank adopts a common compensation capacitor instead of a separate compensation capacitor, the networking mode adopts an ad hoc network mode, the part of a user for setting an address is avoided, the original self-protection function is unchanged, and the intelligent capacitor bank mainly comprises four states of overvoltage, undervoltage, undercurrent and overtemperature.
Each mends intelligent capacitor altogether and increases self-checking compensating current, through condenser current self sampling, transmits the electric current of compensation itself for host computer SVG through 485, and host computer SVG distributes from the reactive compensation capacity of machine SVG through the compensating current of recalculation condenser for the compensation precision is higher.
The invention also discloses a system suitable for operating the novel low-voltage hybrid compensation method, which comprises an active filter, a static var generator, a first current detection unit for detecting the power grid and intelligent capacitors, wherein each intelligent capacitor forms an intelligent capacitor bank; the static var generator comprises a master static var generator and at least one slave static var generator, wherein a control unit of the master static var generator is marked as a first control unit, a control unit of each intelligent capacitor is marked as a second control unit, and a control unit of the slave static var generator and a control unit of the active filter are marked as a third control unit; the first sampling end of the first control unit is electrically connected with the first current detection unit, the communication end of each second control unit is electrically connected with the communication end of the first control unit, and the communication end of the first control unit is electrically connected with the communication end of each third control unit; each intelligent capacitor adopts a complementary capacitor with a self-detection complementary current function.
Each complementary capacitor is networked in an ad hoc network communication mode, namely, on the basis of a software program, each complementary capacitor automatically allocates a communication address according to the sequence of received commands, so that a communication network is formed.
Each complementary capacitor adopts a capacitor with adjustable three-gear communication speed, and the three-gear communication speed is respectively the baud rate 19200, the baud rate 9600 and the baud rate 4800. Such as a complementary capacitor of type ii, a commercially available smart capacitor from sandita electric limited, zhejiang.
The communication end of each second control unit is electrically connected with the communication end of the first control unit, and the electrical connection of the communication end of the first control unit and the communication end of each third control unit means that: the static var generator of the host comprises two paths of 485 communication, one path of communication is in communication connection with the communication end of the adjacent second control unit, the adjacent second control units are in communication connection through a series communication connection structure, the other path of communication is in communication connection with the communication end of the adjacent third control unit, and the adjacent third control units are in communication connection through a series communication connection structure.
The serial communication connection structure is characterized in that all parts are connected together in series, and all parts acquire signals and transmit the signals to the next part, so that wiring is simplified.
The first current detection unit may use a current transformer, referred to as CT for short, which is disposed on the grid side and may be referred to as grid-side CT, that is, CT1 in fig. 1.
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 (7)

1.一种新型低压混合补偿方法，其特征在于，1. a novel low-pressure hybrid compensation method, is characterized in that, 对各静止无功发生器和有源滤波器人为设定通讯地址，静止无功发生器和有源滤波器分别简称为SVG和APF，智能电容器为自组网方式组网，以其中一台SVG作为主机，其余的SVG和APF作为从机，智能电容器将自己的状态信息发送给主机SVG，主机SVG根据发送过来的状态信息得知各智能电容器的补偿情况，主机SVG对电网采样，主机SVG实施控制，包含的过程如下：The communication addresses are artificially set for each static var generator and active filter. The static var generator and active filter are abbreviated as SVG and APF respectively. As the master, the other SVGs and APFs are used as slaves. The smart capacitor sends its own status information to the host SVG. The host SVG knows the compensation status of each smart capacitor according to the sent status information. The host SVG samples the power grid, and the host SVG implements the control, including the following processes: 1)、主机SVG的第一控制单元将采集到的电流波形利用DFT算法计算出每一奇次谐波下的电流大小，记3次谐波电流THDI3，5次谐波电流THDI5，7次谐波电流THDI7、11次谐波电流THDI11，13次谐波电流THDI13，15次谐波电流THDI15，以此类推；然后主机SVG将需要补偿的谐波电流大小通过485通讯传输给APF，APF接收到命令后，控制输出对应次数的电流大小，若第一台APF容量无法满足谐波电流补偿容量时，第二台APF将会执行剩余谐波电流补偿，以此类推。1) The first control unit of the host SVG uses the DFT algorithm to calculate the current under each odd harmonic from the collected current waveform, recording the 3rd harmonic current THDI 3 , the 5th harmonic current THDI 5 , 7 Subharmonic current THDI 7 , 11th harmonic current THDI 11 , 13th harmonic current THDI 13 , 15th harmonic current THDI 15 , and so on; then the host SVG transmits the magnitude of harmonic current that needs to be compensated through 485 communication To the APF, after receiving the command, the APF controls the output current of the corresponding times. If the capacity of the first APF cannot meet the harmonic current compensation capacity, the second APF will perform the residual harmonic current compensation, and so on. 2)、主机SVG的第一控制单元将采集到的电流波形利用DFT算法计算出电流的有效值，进而推导出无功电流大小；2) The first control unit of the host SVG uses the DFT algorithm to calculate the effective value of the current from the collected current waveform, and then derives the magnitude of the reactive current; 投入过程，需要补偿的无功电流大小记为Q投总，主机SVG分配智能电容器和主从机SVG的补偿容量大小，智能电容器投入遵循“分级投入”“优先投入大容量，然后投入小容量”的策略，将智能电容器应该补偿的容量大小记为Qc共，此时主从机SVG应该补偿的无功电流大小为Qs＝Q投总-Qc共，然后计算好各部分补偿电流大小后，在0～1s的时间内，将各部分的投切命令发送给智能电容器；智能电容器接收到命令后，会进行遍历查询或者遍历查询并结合反复校验，找到属于自己地址的那条命令，然后根据命令进行相应的动作；During the input process, the amount of reactive current that needs to be compensated is recorded as the total Q input, the master SVG allocates the compensation capacity of the smart capacitor and the master-slave SVG, and the smart capacitor input follows the "graded input" "prioritize large capacity, and then invest in small capacity" strategy, the capacity that should be compensated by the smart capacitor is recorded as Qc total, and the reactive current that the master and slave SVG should compensate for is Qs = Q total - Qc total, and then after calculating the compensation current of each part, in Within 0-1s, the switching command of each part is sent to the smart capacitor; after the smart capacitor receives the command, it will perform traversal query or traversal query combined with repeated verification to find the command that belongs to its own address, and then according to command to perform the corresponding action; 切除过程，需要切除的无功电流大小记为Q切总，主机SVG分配智能电容器与主从机SVG的补偿容量大小，智能电容器切除策略遵循与投入时相反的策略，将智能电容器应该切除的容量大小记为Qc共，此时主从机SVG应该补偿的无功电流大小为Qs＝Q切总-Qc共，然后计算好各部分补偿电流大小后，在0～1s的时间内，将各部分的投切命令发送给智能电容器，智能电容器接收到命令后，会进行遍历查询或者遍历查询并结合反复校验，找到属于自己地址的那条命令，然后根据命令进行相应的动作。In the cut-off process, the amount of reactive current that needs to be cut off is recorded as Q cut total. The master SVG allocates the compensation capacity of the smart capacitor and the master-slave SVG. The smart capacitor cut strategy follows the opposite strategy to that of the input, and the capacity of the smart capacitor should be cut off. The size is recorded as Qc total. At this time, the reactive current that should be compensated by the master and slave SVG is Qs=Q cut total - Qc total, and then after calculating the compensation current of each part, within 0~1s The switching command is sent to the smart capacitor. After the smart capacitor receives the command, it will perform a traversal query or a traversal query combined with repeated verification to find the command that belongs to its own address, and then perform corresponding actions according to the command. 2.根据权利要求1所述的新型低压混合补偿方法，其特征在于，智能电容器自身具有自检测补偿电流功能，通过自检测将本身补偿的电流信息传输给主机SVG，主机SVG通过重新计算智能电容器的补偿电流，分配从机SVG的无功补偿容量。2. The novel low-voltage hybrid compensation method according to claim 1, characterized in that, the smart capacitor itself has a self-detection compensation current function, and the self-compensated current information is transmitted to the host SVG through self-detection, and the host SVG recalculates the smart capacitor by recalculating the current information. The compensation current is allocated to the reactive power compensation capacity of the slave SVG. 3.采用权利要求1至2中任意一项权利要求所述的方法的一种新型低压混合补偿系统，其特征在于，包括有源滤波器、静止无功发生器、用于检测电网的第一电流检测单元以及智能电容器，各智能电容器构成智能电容器组，第一电流检测单元仅采用一组，有源滤波器的补偿端、静止无功发生器的补偿端和各智能电容器的补偿端分别与电网电连接；静止无功发生器包括一个主机静止无功发生器和至少一个从机静止无功发生器，主机静止无功发生器的控制单元记为第一控制单元，每个智能电容器的控制单元均记为第二控制单元，从机静止无功发生器的控制单元和有源滤波器的控制单元均记为第三控制单元；第一控制单元的第一采样端与第一电流检测单元电连接，各第二控制单元的通讯端分别与第一控制单元的通讯端电连接，第一控制单元的通讯端与各第三控制单元的通讯端电连接；各智能电容器均采用含有自检测补充电流功能的共补型电容器。3. A novel low-voltage hybrid compensation system using the method according to any one of claims 1 to 2, characterized in that it comprises an active filter, a static var generator, a first Current detection unit and smart capacitors, each smart capacitor constitutes a smart capacitor bank, the first current detection unit only uses one set, the compensation end of the active filter, the compensation end of the static var generator and the compensation end of each smart capacitor are respectively The grid is electrically connected; the static var generator includes a master static var generator and at least one slave static var generator, the control unit of the master static var generator is denoted as the first control unit, and the control unit of each smart capacitor The units are denoted as the second control unit, the control unit of the slave static var generator and the control unit of the active filter are denoted as the third control unit; the first sampling end of the first control unit and the first current detection unit The communication terminals of each second control unit are electrically connected to the communication terminals of the first control unit respectively, and the communication terminals of the first control unit are electrically connected to the communication terminals of each third control unit; Complementary capacitors that supplement the current function. 4.根据权利要求3所述的新型低压混合补偿系统，其特征在于，各共补型电容器采用自组网通信结构进行组网。4 . The novel low-voltage hybrid compensation system according to claim 3 , wherein each of the co-compensation capacitors is networked using an ad hoc network communication structure. 5 . 5.根据权利要求3所述的新型低压混合补偿系统，其特征在于，各共补型电容器采用三档通信速率可调的电容器，三档通信速率分别为波特率19200、波特率9600、波特率4800。5. The novel low-voltage hybrid compensation system according to claim 3, characterized in that, each common-compensating capacitor adopts three-speed adjustable capacitors, and the three-speed communication rates are baud rate 19200, baud rate 9600, Baud rate 4800. 6.根据权利要求3所述的新型低压混合补偿系统，其特征在于，各第二控制单元的通讯端分别与第一控制单元的通讯端电连接，第一控制单元的通讯端与各第三控制单元的通讯端电连接是指：主机静止无功发生器包括两路485通讯，一路与相邻的第二控制单元的通讯端通信连接，相邻第二控制单元之间采用串联通信连接结构通信连接，另一路与相邻的第三控制单元的通讯端通信连接，相邻第三控制单元之间采用串联通信连接结构通信连接。6 . The novel low-voltage hybrid compensation system according to claim 3 , wherein the communication end of each second control unit is electrically connected to the communication end of the first control unit, and the communication end of the first control unit is electrically connected to each third control unit. 7 . The electrical connection of the communication end of the control unit means: the host static var generator includes two channels of 485 communication, one of which is connected to the communication end of the adjacent second control unit, and the series communication connection structure is adopted between the adjacent second control units For communication connection, the other way is communicatively connected with the communication end of the adjacent third control unit, and the communication connection between the adjacent third control units adopts a serial communication connection structure. 7.根据权利要求3所述的新型低压混合补偿系统，其特征在于，第一电流检测单元采用CT串联采样结构。7 . The novel low-voltage hybrid compensation system according to claim 3 , wherein the first current detection unit adopts a CT series sampling structure. 8 .
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