In-phase static reactive power controller and control method thereof

Abstract

The invention relates to an in-phase static reactive power controller and a control method thereof. The in-phase static reactive power controller comprises a control protection module and three reactive compensation modules, wherein each reactive compensation module comprises an in-phase adjustable transformer with a secondary side consists of three windings, a power electronic bidirectional switching device, a reactor and a capacitor, the power electronic bidirectional switching device is connected with the control protection module, and the windings at the secondary side of the in-phase adjustable transformer are connected with the reactor and the capacitor through the power electronic bidirectional switching device sequentially. The method comprises the steps of: acquiring power grid voltage and current signals to obtain a reactive capacity, inquiring a switching state table, controlling forward direction switching, reverse direction switching or no switching of the windings at the secondary side of the in-phase adjustable transformer so as to change end voltages of the capacitor, and outputting the reactive capacity. The in-phase static reactive power controller has the characteristics of reactive continuous regulation, reliability in operation, small loss, high response speed, small occupation area, less investment and the like.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to an in-phase static reactive power controller and a control method thereof. Background technique [0002] At present, with the development of the economy, power users have higher and higher requirements for power quality. Voltage deviation is an important aspect of power quality. At present, the distribution network system with wide coverage and large quantity has the status quo of large power supply radius and unreasonable structure, which causes the problem of voltage deviation to be more prominent. The common means of voltage adjustment is to use on-load voltage regulating transformer and switch switching capacitor bank. However, both the on-load tap changer and the switching capacitor bank have the disadvantage that they cannot operate frequently with the fluctuation of the load. At the same time, the vacuum circuit breaker is used to switch the capaci...

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Problems solved by technology

[0004] The existing static var compensator can quickly and frequently solve the problem of voltage fluctuation, but it has the problems of large area and large investment, and cannot be widely used in existing substations, especially in urban substations. Another fast, Thyristor switching capacitor devices that frequently solve the problem of voltage fluctuations have the problems of poor reactive power adjustment smoothness and large investment

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