技术领域technical field
本发明属于电气工程领域，具体涉及一种链式SVG相间对冲测试系统的控制方法。The invention belongs to the field of electrical engineering, and in particular relates to a control method for a chain-type SVG interphase hedge test system.
背景技术Background technique
随着经济技术的发展，电能已经成为了人们生产和生活中必不可少的二次能源，给人们的生产和生活带来了无尽的便利。而随着新能源发电及特高压输电技术的快速发展，电网对动态无功补偿设备的需求日趋迫切。在具有动态无功补偿能力的无功设备中，静态同步发生器(Static Var Generator，SVG)因具有响应速度快、并网谐波小而受到关注。With the development of economy and technology, electric energy has become an indispensable secondary energy source in people's production and life, bringing endless convenience to people's production and life. With the rapid development of new energy power generation and UHV transmission technology, the demand for dynamic reactive power compensation equipment in power grids is becoming increasingly urgent. Among the reactive power equipment with dynamic reactive power compensation capability, the static synchronous generator (Static Var Generator, SVG) has attracted attention because of its fast response speed and small grid-connected harmonics.
为了保证SVG设备到达客户现场时能一次投运成功与稳定运行，通常要求在SVG出厂试验中尽量多地完成相关测试项目。目前，SVG出厂测试一般是对SVG各部件进行分项测试，比如测试功率模块单体的换流链对冲试验、测试装置电压控制能力的整机空载试验、测试控制保护系统的半实物仿真测试等，受条件所限常常不进行同时达到额定电压和额定电流的整机满载试验。仅有少量SVG会在出厂前用对拖试验平台进行带载对冲试验，利用电容器或电抗器组或其他SVG作为陪测无功设备，避免厂区供电网络容量超限。但这种方法需在厂区配置与被测SVG容量相当的陪测无功设备，若当SVG容量达百兆乏时，由于此类SVG项目数目本身就较少，可能数年才会生产一套装置，难以再找到一台陪测SVG来进行功率对冲，若单独为此装置建设前述对冲试验平台，则试验平台造价太高。In order to ensure that the SVG equipment can be put into operation successfully and run stably when it arrives at the customer site, it is usually required to complete as many relevant test items as possible in the SVG factory test. At present, the SVG factory test is generally a sub-item test for each component of the SVG, such as the hedging test of the commutation chain for testing the single power module, the no-load test of the whole machine for testing the voltage control capability of the device, and the semi-physical simulation test for testing the control and protection system. etc. Due to the limited conditions, the full load test of the whole machine that reaches the rated voltage and rated current at the same time is often not carried out. Only a small number of SVGs will use the towing test platform to carry out on-load hedging tests before leaving the factory, and use capacitors or reactor banks or other SVGs as reactive power equipment for accompanying testing to avoid exceeding the capacity of the power supply network in the factory. However, this method needs to configure reactive power equipment with the same capacity as the tested SVG in the factory area. If the SVG capacity reaches 100 megavar, because the number of such SVG projects is relatively small, it may take several years to produce one set device, it is difficult to find another SVG for power hedging. If the aforementioned hedging test platform is built solely for this device, the cost of the test platform will be too high.
发明专利CN201810654389.X公开了一种大容量SVG的出厂满载测试方法，其特征是将三相SVG重构为两并一串的接线方式，再对并联两相进行无功对冲功率考核。可在SVG对外输出容量远小于其额定容量的条件下进行SVG在额定电压和额定电流下的分相考核测试，且不需要额外增加陪测设备，便于在有限厂区供电容量下实现对大容量SVG的出厂满载测试，该方法对应测试平台的结构简单、造价低，解决了SVG在厂内高效、经济的满载测试问题。相对于常规SVG，该测试方法的结构特征是SVG运行在两并一串的测试模式，但这种接线方式与现有SVG三相分别连接到电网三相的接线方式存在显著差异，导致已有的SVG闭环控制方法不再适用。Invention patent CN201810654389.X discloses a factory full-load test method for large-capacity SVG, which is characterized in that the three-phase SVG is reconstructed into a two-parallel and one-series connection mode, and then the reactive power hedging power assessment is performed on the parallel two-phase. Under the condition that the external output capacity of SVG is much smaller than its rated capacity, the phase-separated assessment test of SVG at rated voltage and rated current can be carried out, and no additional accompanying test equipment is needed, which is convenient for large-capacity SVG under limited power supply capacity of the factory area. The factory full-load test, this method corresponds to the simple structure and low cost of the test platform, which solves the problem of efficient and economical full-load test of SVG in the factory. Compared with the conventional SVG, the structural feature of this test method is that the SVG runs in a two-parallel test mode, but this wiring method is significantly different from the existing SVG three-phase connection to the grid three-phase connection method, resulting in the existing The SVG closed-loop control method is no longer applicable.
发明内容Contents of the invention
本发明的目的在于提供一种链式SVG相间对冲测试系统的控制方法,用于实现对链式SVG两并一串这种特殊接线方式下的各相换流链的电压电流实时调控，从而维持SVG在分相对冲测试模式下的持续稳定运行。The purpose of the present invention is to provide a control method for a chained SVG phase-to-phase hedging test system, which is used to realize the real-time regulation of the voltage and current of each phase commutation chain under the special wiring mode of chained SVG two-parallel-one-string, so as to maintain The continuous and stable operation of SVG in split phase and offset test mode.
本发明提供的这种链式SVG相间对冲测试系统的控制方法，具体包括如下步骤：The control method of this chained SVG interphase hedge test system provided by the present invention specifically includes the following steps:
S1.获取并网点端口电压的相位信息，并计算得到各相换流链的相位基准值；S1. Obtain the phase information of the port voltage of the grid-connected point, and calculate the phase reference value of the commutation chain of each phase;
S2.根据预设的对冲电流大小以及步骤S1得到的各相换流链的相位基准值，计算需对冲两相的无功电流指令；S2. According to the preset offsetting current magnitude and the phase reference values of the commutation chains of each phase obtained in step S1, calculate the reactive current commands that need to offset the two phases;
S3.对三相换流链的直流电压进行实时闭环控制，从而得到有功电流分量指令；S3. Perform real-time closed-loop control on the DC voltage of the three-phase commutation chain, thereby obtaining active current component commands;
S4对步骤S2得到的无功电流指令和步骤S3得到的有功电流分量指令进行合成，从而得到短接两相的电流指令；S4 synthesizes the reactive current command obtained in step S2 and the active current component command obtained in step S3, so as to obtain a current command for shorting two phases;
S5.对短接两相进行电流闭环控制，再对非短接相进行电压开环控制，从而得到三相换流链的每相输出电压需求值；S5. Perform current closed-loop control on the shorted two phases, and then perform voltage open-loop control on the non-shorted phases, so as to obtain the output voltage demand value of each phase of the three-phase commutation chain;
S6.利用移相载波调制，得到各相中每个换流链的驱动控制信号。S6. Using phase-shifted carrier modulation to obtain a drive control signal for each commutation chain in each phase.
步骤S1中所述的获取并网点端口电压的相位信息，具体为首先检测并网点端口的电压Uac，然后利用锁相锁相环(Phase Lock Loop,PLL)提取并网点端口电压的相位θAC，然后用并网点端口电压的相位θAC减去30°后作为短接相换流链的电压相位θA，最后再用短接相换流链的电压相位θA减去120°后作为与电网连接相换流链的电压相位θC。Obtaining the phase information of the grid-connected point port voltage described in step S1 is specifically to first detect the voltage Uac of the grid-connected point port, and then use a phase-locked loop (Phase Lock Loop, PLL) to extract the phase θAC of the grid-connected point port voltage , and then subtract 30° from the phase θAC of the grid-connected port voltage as the voltage phase θA of the short-circuit commutation chain, and finally subtract 120° from the voltage phase θA of the short-circuit commutation chain as the Voltage phase θC of the grid-connected phase commutation chain.
步骤S2所述的计算需对冲两相的无功电流指令，具体为采用如下算式计算需对冲两相的无功电流指令：The calculation described in step S2 needs to offset the reactive current commands of the two phases. Specifically, the following formula is used to calculate the reactive current commands that need to be offset by the two phases:
iaQ*＝IQ×cos(θA)iaQ* ＝IQ ×cos(θA )
ibQ*＝-iaQ*＝-IQcos(θA)ibQ* ＝-iaQ* ＝-IQ cos(θA )
式中iaQ*和ibQ*为需对冲两相的无功电流指令，IQ为预设的对冲电流值，θA为短接相换流链的电压相位。In the formula, iaQ* and ibQ* are the reactive current commands that need to offset the two phases, IQ is the preset offset current value, and θA is the voltage phase of the short-circuit commutation chain.
步骤S3所述对三相换流链的直流电压进行实时闭环控制，从而得到有功电流分量指令，具体为利用三个直流电流环，分别对三相换流链直流电压进行实时闭环调控，得到三个有功电流分量指令。In step S3, real-time closed-loop control is performed on the DC voltage of the three-phase commutation chain to obtain active current component commands. An active current component command.
所述的对三相换流链的直流电压进行实时闭环控制，从而得到有功电流分量指令，具体为采用如下方法计算得到有功电流分量指令：The real-time closed-loop control of the DC voltage of the three-phase commutation chain to obtain the active current component command is specifically calculated by the following method to obtain the active current component command:
iaP*＝PI(Udc_A*-Udc_A)×sin(θA)iaP* ＝PI(Udc_A* -Udc_A )×sin(θA )
ibP*＝PI(Udc_B*-Udc_B)×sin(θA)ibP* ＝PI(Udc_B* -Udc_B )×sin(θA )
icP*＝PI(Udc_C*-Udc_C)×cos(θA)icP* ＝PI(Udc_C* -Udc_C )×cos(θA )
式中iaP*和ibP*为短接两相的有功电流分量指令，icP*为非短接相的有功电流分量指令；PI表示利用PI控制器进行闭环控制；Udc_A*和Udc_B*为短接两相的直流电压指令，Udc_C*为非短接相的直流电压指令；Udc_A和Udc_B为短接两相的直流电压反馈值，Udc_C为非短接相的直流电压反馈值；θA为短接相换流链的电压相位。In the formula, iaP* and ibP* are the active current component commands of short-circuited two phases, and icP* is the active current component command of non-short-circuited phases; PI means closed-loop control by PI controller; Udc_A* and Udc_B* is the DC voltage command of the two-phase short-circuit, Udc_C* is the DC voltage command of the non-short-circuit phase; Udc_A and Udc_B are the DC voltage feedback values of the two-phase short-circuit, Udc_C is the DC voltage of the non-short-circuit phase Feedback value; θA is the voltage phase of the short-circuited commutation chain.
步骤S4所述的对步骤S2得到的无功电流指令和步骤S3得到的有功电流分量指令进行合成，从而得到短接两相电流指令，具体为采用如下算式进行合成：In step S4, the reactive current command obtained in step S2 and the active current component command obtained in step S3 are combined to obtain a short-circuit two-phase current command, which is specifically synthesized by using the following formula:
ia*＝iaQ*+iaP*ia* =iaQ* +iaP*
ib*＝ibQ*+ibP*+icP*ib* ＝ibQ* +ibP* +icP*
式中ia*和ib*为合成得到的短接两相的电流指令；iaQ*和ibQ*为需对冲两相的无功电流指令，iaP*和ibP*为短接两相的有功电流分量指令，icP*为非短接相的有功电流分量指令。In the formula, ia* and ib* are the synthesized short-circuit two-phase current commands; iaQ* and ibQ* are the reactive current commands to be hedged, and iaP* and ibP* are short-circuit two-phase current commands. The active current component command of the phase, icP* is the active current component command of the non-short-circuited phase.
步骤S5所述的对短接两相进行电流闭环控制，再对非短接相进行电压开环控制，从而得到三相换流链的每相输出电压需求值；具体为利用经典PI控制器对短接两相实施电流闭环控制，得到各自的相输出电压需求值；对非短接相，则根据其预设的电压设定值及相位直接计算其输出电压需求值。In step S5, the current closed-loop control is performed on the shorted two phases, and then the voltage open-loop control is performed on the non-shorted phases, so as to obtain the output voltage demand value of each phase of the three-phase commutation chain; specifically, the classic PI controller is used to control Short-circuit the two phases to implement current closed-loop control, and obtain the respective phase output voltage demand values; for non-short-circuit phases, directly calculate the output voltage demand value according to its preset voltage setting value and phase.
本发明提供的这种链式SVG相间对冲测试系统的控制方法，专门针对链式SVG分相对冲测试模式而设计，适用于SVG两相并联后再与另一相串联的特殊接线方式，可在进行相间无功对冲考核的同时维持三相换流链直流电压稳定，从而保持系统持续稳定运行以长期考核。本发明方法对三相换流链直流电压都实现了闭环调控，因此即使因系统参数误差、定向误差、控制误差等因素导致部分环节实际效果易于理想工况，也能通过闭环调控校正过来，从而鲁棒性强、适应性强；最后，本发明方法与SVG常规分相控制系统结构中绝大部分模块类似，可在常规控制系统结构上进行局部改造而来，结构简单、易于实现。The control method of the chained SVG phase-to-phase hedge test system provided by the present invention is specially designed for the chained SVG phase-to-phase hedge test mode, and is suitable for the special wiring method in which two phases of SVG are connected in parallel and then connected in series with another phase. While performing phase-to-phase reactive power hedging assessment, maintain the DC voltage stability of the three-phase commutation chain, so as to maintain the continuous and stable operation of the system for long-term assessment. The method of the present invention realizes closed-loop regulation and control of the DC voltage of the three-phase commutation chain, so even if the actual effect of some links is easy to ideal working conditions due to factors such as system parameter errors, orientation errors, and control errors, it can be corrected through closed-loop regulation, thereby Strong robustness and strong adaptability; finally, the method of the present invention is similar to most of the modules in the structure of the SVG conventional phase-splitting control system, and can be partially modified on the structure of the conventional control system, with a simple structure and easy implementation.
附图说明Description of drawings
图1为本发明方法的方法流程示意图。Fig. 1 is a schematic flow chart of the method of the present invention.
图2为本发明方法对应的链式SVG相间对冲测试系统的主电路结构图。Fig. 2 is a main circuit structure diagram of a chained SVG phase-to-phase hedge test system corresponding to the method of the present invention.
具体实施方式Detailed ways
如图1所示为本发明方法的方法流程示意图，其对应的链式SVG相间对冲测试系统主电路结构图如图2所示。FIG. 1 is a schematic flow chart of the method of the present invention, and its corresponding chained SVG interphase hedge test system main circuit structure diagram is shown in FIG. 2 .
在具体实施时，SVG分相对冲测试测试时，可选任意两相端口短接，构成两相换流链内部并联后再与第三相换流链串联。以下以SVG的AB两相端口短接后接到电网A相接入点、C相直接与电网相连的接线方式为例，详细说明本发明所提控制方法的实施方式。In the specific implementation, during the SVG split-phase offset test, any two-phase ports can be short-circuited to form a parallel connection within the two-phase commutation chain and then connected in series with the third-phase commutation chain. The implementation of the control method proposed in the present invention will be described in detail below by taking the wiring mode in which the AB two-phase ports of the SVG are short-circuited and then connected to the access point of the grid A phase, and the C phase is directly connected to the grid.
本发明提供的这种链式SVG相间对冲测试系统的控制方法，包括The control method of this chained SVG phase-to-phase hedge testing system provided by the present invention includes
S1.获取并网点端口电压的相位信息，并计算得到各相换流链的相位基准值；具体为首先检测并网点端口的电压Uac，然后利用锁相锁相环(Phase Lock Loop,PLL)提取并网点端口电压的相位θAC，然后用并网点端口电压的相位θAC减去30°后作为A相换流链的电压相位θA，最后再用A相换流链的电压相位θA减去120°后作为C相换流链的电压相位θC；S1. Obtain the phase information of the voltage at the grid-connected point port, and calculate the phase reference value of each phase commutation chain; specifically, first detect the voltage Uac at the grid-connected point port, and then use a phase-locked loop (Phase Lock Loop, PLL) Extract the phase θAC of the port voltage at the grid-connected point, then subtract 30° from the phase θAC of the port voltage at the grid-connected point, and use it as the voltage phase θ A of the A-phase commutation chain, and finally use the voltage phase θA of theA -phase commutation chain Subtract 120° as the voltage phase θC of the C-phase commutation chain;
S2.根据预设的对冲电流大小以及步骤S1得到的各相换流链的相位基准值，计算需对冲两相的无功电流指令；具体为采用如下算式计算需对冲两相的无功电流指令：S2. According to the preset offset current size and the phase reference values of the commutation chains of each phase obtained in step S1, calculate the reactive current commands that need to offset the two phases; specifically, use the following formula to calculate the reactive current commands that need to offset the two phases :
iaQ*＝IQ×cos(θA)iaQ* ＝IQ ×cos(θA )
ibQ*＝-iaQ*＝-IQcos(θA)ibQ* ＝-iaQ* ＝-IQ cos(θA )
式中iaQ*和ibQ*为需对冲两相的无功电流指令，IQ为预设的对冲电流值，θA为短接相换流链的电压相位，即A相换流链的电压相位；In the formula, iaQ* and ibQ* are the reactive current commands that need to offset the two phases, IQ is the preset offset current value, θA is the voltage phase of the short-circuit commutation chain, that is, the phase A commutation chain voltage phase;
S3.对三相换流链的直流电压进行实时闭环控制，从而得到有功电流分量指令；具体为利用三个直流电流环，分别对三相换流链直流电压进行实时闭环调控，得到三个有功电流分量指令；S3. Perform real-time closed-loop control on the DC voltage of the three-phase commutation chain to obtain active current component commands; specifically, use three DC current loops to perform real-time closed-loop regulation on the DC voltage of the three-phase commutation chain to obtain three active components. Current component command;
在具体实施时，具体为采用如下算式计算得到有功电流分量指令：In specific implementation, the following formula is used to calculate the active current component command:
iaP*＝PI(Udc_A*-Udc_A)×sin(θA)iaP* ＝PI(Udc_A* -Udc_A )×sin(θA )
ibP*＝PI(Udc_B*-Udc_B)×sin(θA)ibP* ＝PI(Udc_B* -Udc_B )×sin(θA )
icP*＝PI(Udc_C*-Udc_C)×cos(θA)icP* ＝PI(Udc_C* -Udc_C )×cos(θA )
式中iaP*和ibP*为短接两相的有功电流分量指令(即A相有功电流分量指令和B相有功电流分量指令)，icP*为非短接相的有功电流分量指令(即C相有功电流分量指令)；PI表示利用PI控制器进行闭环控制；Udc_A*和Udc_B*为短接两相的直流电压指令(即A相直流电压指令和B相直流电压指令)，Udc_C*为非短接相的直流电压指令(即C相直流电压指令)；Udc_A和Udc_B为短接两相的直流电压反馈值(即A相直流电压反馈值和B相直流电压反馈值)，Udc_C为非短接相的直流电压反馈值(即C相直流电压反馈值)；θA为短接相换流链的电压相位(A相换流链的电压相位)即；In the formula, iaP* and ibP* are the active current component commands of the short-circuited two phases (that is, the active current component command of the A phase and the active current component command of the B phase), and icP* is the active current component command of the non-short-circuit phase ( That is, C-phase active current component command); PI means closed-loop control by PI controller; Udc_A* and Udc_B* are short-circuited two-phase DC voltage commands (that is, A-phase DC voltage command and B-phase DC voltage command), Udc_C* is the DC voltage command of the non-short-circuited phase (that is, the C-phase DC voltage command); Udc_A and Udc_B are the DC voltage feedback values of the two value),Udc_C is the DC voltage feedback value of the non-short-circuited phase (that is, the DC voltage feedback value of C-phase); θA is the voltage phase of the short-circuited commutation chain (the voltage phase of the A-phase commutation chain);
在具体实施时，与常规的单相换流链系统一样，每相换流链的直流电压指令值与其实际反馈值作差后经PI控制器调控后得到等效为电流幅值的数值，再分别乘以相应的基波正弦信号得到有功调控指令；其中AB两相中的基波正弦信号都是A相电压相位对应的正弦波，与其各自换流链电压矢量正好平行，故又可直接成为有功电流指令；而C相中的基波正弦信号为A相电压相位对应的余弦波，其与A相换流链的输出电压正好垂直正交，但与C相换流链的输出电压却非正交，故该电流即使流过A相或B相换流链也对其有功平衡不会产生影响，但却对C相换流链的有功平衡可产生影响；In the specific implementation, as with the conventional single-phase commutation chain system, the DC voltage command value of each phase commutation chain is different from its actual feedback value, and after being regulated by the PI controller, the value equivalent to the current amplitude is obtained, and then Multiplied by the corresponding fundamental sinusoidal signals respectively to obtain the active power control command; the fundamental sinusoidal signals in the two phases A and B are all sinusoidal waves corresponding to the voltage phase of A phase, which are exactly parallel to the voltage vectors of their respective commutation links, so they can be directly Active current command; while the fundamental sine signal in phase C is the cosine wave corresponding to the voltage phase of phase A, which is exactly vertical and orthogonal to the output voltage of the commutation chain of phase A, but is not the same as the output voltage of the commutation chain of phase C. Orthogonal, so even if the current flows through the A-phase or B-phase commutation chain, it will not affect its active power balance, but it can affect the active power balance of the C-phase commutation chain;
S4.对步骤S2得到的无功电流指令和步骤S3得到的有功电流分量指令进行合成，从而得到短接两相的电流指令；具体为采用如下算式进行合成：S4. Combining the reactive current command obtained in step S2 and the active current component command obtained in step S3, so as to obtain the current command for short-circuiting two phases; specifically, the following formula is used for synthesis:
ia*＝iaQ*+iaP*ia* =iaQ* +iaP*
ib*＝ibQ*+ibP*+icP*ib* ＝ibQ* +ibP* +icP*
式中ia*和ib*为合成得到的短接两相的电流指令(即A相电流指令和B相电流指令)；iaQ*和ibQ*为需对冲两相的无功电流指令(即A相无功电流指令和B相无功电流指令)，iaP*和ibP*为短接两相的有功电流分量指令(即A相有功电流指令和B相有功电流指令)，icP*为非短接相的有功电流分量指令(即C相有功电流指令)；In the formula, ia* and ib* are the synthesized short-circuit two-phase current commands (that is, the A-phase current command and the B-phase current command); iaQ* and ibQ* are the reactive current commands that need to offset the two phases (i.e. A-phase reactive current command and B-phase reactive current command), iaP* and ibP* are short-circuited two-phase active current component commands (ie A-phase active current command and B-phase active current command), icP* is the active current component command of the non-short-circuited phase (that is, the C-phase active current command);
S5.对短接两相进行电流闭环控制，再对非短接相进行电压开环控制，从而得到三相换流链的每相输出电压需求值；具体为利用经典PI控制器对AB相实施电流闭环控制，得到各自的相输出电压需求值；对C相换流链，则根据C相电压设定值及其电压相位直接计算其输出电压需求值；S5. Conduct current closed-loop control on the shorted two phases, and then perform voltage open-loop control on the non-short-connected phases, so as to obtain the output voltage demand value of each phase of the three-phase commutation chain; specifically, use the classic PI controller to implement the AB phase Current closed-loop control to obtain the respective phase output voltage demand value; for C-phase commutation chain, the output voltage demand value is directly calculated according to the C-phase voltage setting value and its voltage phase;
S6.利用移相载波调制，得到各相中每个换流链的驱动控制信号。S6. Using phase-shifted carrier modulation to obtain a drive control signal for each commutation chain in each phase.
本发明的控制方法的原理为：A相电流指令中的第一部分和B相电流中的第一部分相互抵消即功率对冲，从而实现给定无功电流下负载考核；A相电流指令中的第二部分和B相电流中的第二部分用来调控各自换流链的有功吸收功率，以补偿阀组开关及回路电阻带来的有功损耗，从而维持A相和B相换流链的直流电压稳定，由于SVG的回路有功损耗远小于其无功输出值，故该电流会远小于SVG额定电流；B相电流指令中的第三部分因为与B相支路电压垂直，所以不会影响B相稳态直流电压，但是通过该分量的调节可使得并网C相电流方向与C相输出电压基本垂直，从而使得C相阀组中的电流主要为无功分量，同时调节该分量大小可使得C相电流中含有一定的与C相电压同相或反向的有功分量，从而稳定C相直流电压稳定。The principle of the control method of the present invention is: the first part of the A-phase current command and the first part of the B-phase current cancel each other, that is, power hedging, so as to realize the load assessment under a given reactive current; the second part of the A-phase current command Part and the second part of the phase B current are used to regulate the active absorbed power of the respective commutation chains to compensate the active power loss caused by the valve group switch and loop resistance, so as to maintain the DC voltage stability of the A phase and B phase commutation chains , since the active power loss of the SVG circuit is much smaller than its reactive output value, the current will be much smaller than the rated current of the SVG; the third part of the B-phase current command is perpendicular to the B-phase branch voltage, so it will not affect the B-phase stability state DC voltage, but through the adjustment of this component, the current direction of the grid-connected phase C is basically perpendicular to the output voltage of the C phase, so that the current in the C-phase valve group is mainly a reactive component. At the same time, adjusting the size of this component can make the C-phase The current contains a certain active component that is in phase or opposite to the C-phase voltage, thereby stabilizing the C-phase DC voltage.
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| CN201910814174.4ACN110488713B (en) | 2019-08-30 | 2019-08-30 | Control method of chain type SVG interphase hedging test system |
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| CN201910814174.4ACN110488713B (en) | 2019-08-30 | 2019-08-30 | Control method of chain type SVG interphase hedging test system |
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| CN110488713B CN110488713B (en) | 2021-08-10 |
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| CN201910814174.4AActiveCN110488713B (en) | 2019-08-30 | 2019-08-30 | Control method of chain type SVG interphase hedging test system |
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