Compensation method for control delay of static synchronous compensator
A technology of static synchronous compensation and control delay, applied in the direction of reactive power adjustment/elimination/compensation, flexible AC transmission system, etc. To the compensation effect and other issues, to achieve the effect of reducing adverse effects, rapid and reliable results, and improving accuracy
Inactive Publication Date: 2016-01-06
SHANXI JINMEI GRP TECH RESEACH INST
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The existence of control delay greatly affects the compensation performance of the static synchronous compensator
[0004] The existence of control delay makes the system command current signal lag behind the actual command current signal, which will greatly affect the compensation accuracy of the static synchronous compensator, and the impact will be greater with the increase of the delay time. In severe cases, it will not only fail to compensate , and even introduce additional reactive current to the grid, making the quality of the grid even worse
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[0017] The present invention will be further described below in conjunction with the accompanying drawings.
[0018] figure 1 is based on i p -i q The schematic diagram of the principle of obtaining the fundamental active current component of the system by the method.
[0019] Symmetrical three-phase supply voltage, i La i Lb i Lc They are three-phase load currents, usually including fundamental active current, fundamental reactive current and harmonic current. According to the theory of instantaneous reactive power: the three-phase load current i La i Lb i Lc After 3 / 2 conversion, the two-phase current i is obtained α i β , put i α i β The active current and reactive current components i are obtained by two-phase rotation transformation p i q , where the source of the synchronous signal in the transformation matrix C has a significant effect on the phase voltage e of the system a a phase-locked, the i p The DC component of the active current can be obtained th...
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The invention discloses a compensation method for control delay of a static synchronous compensator. The compensation method includes the following steps: detecting the active components of load current; determining the current running status of a power grid; performing delay compensation on the active components of the load current based on a determined result; obtaining an instruction current signal of a static synchronous compensator, and serving the instruction current signal as a preset signal; calculating a difference value between the preset signal and a power grid current signal; adjusting the difference value based on proportional-resonant control, and then obtaining actuating signals of switching tubes by modulation. After the control delay of the static synchronous compensator is compensated, the influence of delay on a system is effectively reduced, and the compensation precision and the fast tracking performance of the system are ensured.
Description
technical field [0001] The invention belongs to the technical field of static synchronous compensators, in particular to a compensation method for control delay of static synchronous compensators. Background technique [0002] There are a large number of inductive loads such as transformers and motors and impact loads such as electric arc furnaces and electric welding machines in the distribution network of coal mine enterprises. Unsatisfactory reactive power requirements and frequent actions of impact loads will cause grid voltage fluctuations and flicker. It affects the normal production of the enterprise and the normal life of the people, and at the same time leads to an increase in line loss and a decrease in power factor. Reactive power compensation can make reasonable use of system capacity, improve power factor, reduce line loss, and stabilize the system voltage at the access point. Compared with traditional reactive power compensation methods such as fixed capacitor...
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IPC IPC(8): H02J3/18
CPCY02E40/10
Inventor 孙晋璐王晋生王落胜陈永峰李在住陈浩然
Owner SHANXI JINMEI GRP TECH RESEACH INST