Control method of series voltage compensation device

Abstract

The invention discloses a control method of a series voltage compensation device. The control method comprises the following steps: acquiring a reference rated voltage of a three-phase system, a load side three-phase voltage, and a filter inductive current at the AC side of an inverter unit through a data acquiring unit; calculating the difference between the three-phase voltage at the load side and the reference rated voltage of the three-phase system through a first error comparator, and treating the difference as the input of a proportion resonance regulator; calculating the difference between the output of the proportion resonance regulator set and the filter inductive current through a second error comparator, and treating the difference as the input of a proportion controller; accumulating the output of the proportion controller and the front feed of network voltage, and treating the product of the accumulated value and the DC voltage coefficient as IGBT (Insulated Gate Bipolar Translator) input of the inverter unit; accumulating the IGBT output of the inverter unit and the network voltage, and then controlling the load voltage. According to the control method of the series voltage compensation device, the design of combining the series compensation device and the DC voltage coefficient when a network suffers from a fault quickly and effectively ensures the stability of amplitude of the load port voltage.

Description

technical field [0001] The invention relates to the electric power field, and more specifically, relates to a control method of a series voltage compensation device. Background technique [0002] The series voltage compensation device is independent of the power grid and load, and can be applied to general energy consumption loads and energy feedback loads. When it is applied to the low voltage ride-through compensation of wind turbines, because it is independent of wind turbines and access systems, the compensation performance is not good. Relying on the fan's own characteristics, it has gradually attracted people's attention. The device is connected in series between the load and the grid. When the system voltage drops, the device outputs compensation voltage to ensure the voltage stability of the load side, so that the load is not affected by the system voltage drop. When the drop disappears, it can quickly resume sending active power to the system. and reactive energy. ...

AI Technical Summary

Problems solved by technology

At present, there are few studies on the low-voltage device of the series fan. Some literatures propose to feed back part of the energy to the grid. However, for short-term large current impacts, higher requirements are placed on the control, and the reliability of the device is reduced.

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