Direct power control method of three-phase static reactive-power synchronous compensator

Abstract

The invention discloses a direct power control method of a three-phase static reactive-power synchronous compensator, which is characterized in that: the control of reactive-power current and direct-current-side voltage is completed collectively by a voltage control ring and a dead-beat current control ring, so not only is a phase-locked loop not required, but also the waveform quality of the outputted current and the stability of the direct-current-side capacitance and voltage of the static reactive-power synchronous compensator can be guaranteed, the controllers have simple design and are easy to realize on the engineering, and the direct power control method has the characteristics of fast response speed, high control precision and good self adaptability.

Description

technical field [0001] The invention relates to a control method of a static var synchronous compensator suitable for a three-phase power grid, in particular to a direct power control method of a three-phase static var synchronous compensator based on current stepless adjustment in an αβ coordinate system. Background technique [0002] Due to the reduction of non-renewable energy sources, power shortages, and increasingly serious environmental pollution, power-saving technology has attracted widespread attention from all over the world. Static var synchronous compensators have become one of the main equipment to reduce power grid line losses and improve power quality. Therefore, it is of great economic significance to control the static var synchronous compensator (STATCOM) for three-phase power grids that is easy to implement and has excellent control performance. [0003] The main circuit topology used for static var synchronous compensator mainly consists of voltage sourc...

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Problems solved by technology

Among them, although the proportional integral control should be widely used, it is difficult to adjust the AC volume without static difference; the hysteresis control has the advantage of fast dynamic response, but the switching frequency of the power device changes with the change of the instantaneous value of the current, so that Filter design is difficult; direct power control does not need to perform current rotation transformation, and the appropriate vector can be directly selected through the switch table to realize active power control, but there is no current inner loop control, so it is difficult to ensure the quality of current waveform; deadbeat control dynamic response It should be fast and stable, and can control the instantaneous error within a switching cycle variation, but the existing relevant literature requires a phase-locked loop and rotation conversion, which increases the delay factor and the amount of calculation; resonance control can Realize the static-free control of AC volume, but the design of its controller parameters is complicated, and it needs repeated tests and adjustments; the control effect and robustness of robust control and other existing nonlinear control methods are good, but their design The method is complicated, the amount of calculation is large, and it is not easy to implement in engineering

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