Distributed generation reactive compensation device

Abstract

The invention discloses a distributed generation reactive compensation device, relating to a grid compensation device and providing a distributed generation reactive compensation device which can operate stably and cannot generate resonance. The distributed generation reactive compensation device is provided with a thyristor controlled reactor, a fixed capacitor group, an active power filter and a control circuit, wherein the thyristor controlled reactor is directly connected with a power grid in parallel; the fixed capacitor group is connected with the active power filter in series and is then connected to the power gird; a driving pulse signal end of the control circuit is respectively connected with the thyristor controlled reactor and the active power filter. The control circuit can be provided with a grid voltage and current sampling circuit, a digital signal processing (DSP) controller, an IPM (Intelligent Power Module) driving circuit, a thyristor driving circuit, a liquid crystal display and a protection circuit.

Description

technical field [0001] The invention relates to a power grid compensation device, in particular to a reactive power compensation device for distributed generation. Background technique [0002] With the continuous growth of electricity demand, the centralized large power grid has developed rapidly in the past few decades and has become the main electricity supply channel. However, this power supply mode also has many disadvantages: high operating costs, difficult control, and difficult to meet the increasingly high safety and reliability requirements of users. Especially in recent years, after several large-scale blackouts occurred in the world, the vulnerability of large power grids was fully exposed, which made distributed generation more and more important. Distributed power generation generally refers to a small power generation system connected to the power distribution system that is miniaturized, modularized, decentralized, and arranged near the user to provide power...

AI Technical Summary

Problems solved by technology

Passive filters have the advantages of simple structure, less investment in equipment, and lower operating costs, but there are also some shortcomings that cannot be eradicated: the compensation effect is dependent on the load, the use is not flexible enough, and it is easy to cause series and parallel resonance. The shortcoming greatly affects the stability of the whole set of reactive power compensation device

But in this case, the voltage level of the switching device of the active power filter needs to be greater than the grid voltage, which increases the cost of the entire reactive power compensation device, so the cost performance is not high

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