Harmonic, reactive and negative sequence comprehensive control method for complicated power system

Abstract

The present invention discloses one harmonic, reactive and negative sequence comprehensive control method and device for complicated power system. The current distortion is considered in compensation, and the method is suitable for all network. The device combines passive and active compensation, and has thyristor split-phase throw-in and throw-off capacitor combination to compensate fundamental wave reactive power and partial fundamental wave negative sequence current and small-capacity active filter to compensate fundamental wave current and partial fundamental wave negative sequence current. The comprehensive compensating device can inhibit harmonics and negative sequence power effectively and raise the power factor of load, raise electric energy quality.

Description

technical field [0001] The invention belongs to the technical field of power system power quality control, in particular to a method for comprehensively controlling harmonics, reactive power and negative sequence in complex power systems. Background technique [0002] With the development of the power industry, on the one hand, many users have put forward more and more requirements for power quality, and on the other hand, there are more and more loads affecting power quality in the distribution network, so the problem of power quality has become increasingly prominent. For example, with the rapid development of power electronics technology, nonlinear loads, asymmetric loads, and impact loads such as electric arc furnaces, electric locomotives, rolling mills, and large-capacity power electronic converters in the power grid continue to increase. The current rises sharply. Some new power electronic equipment, such as switching power supply, precision flat welding machine, etc...

AI Technical Summary

Problems solved by technology

At present, the reactive power compensation in the power system mostly adopts capacitor switching controlled by mechanical switches, and the harmonic compensation mostly uses passive filter devices, and the work of negative sequence control has not yet been carried out on a large scale

In addition, currently reactive power compensation, negative sequence current compensation, and harmonic suppression are carried out separately and independently

Because the treatment is not carried out comprehensively according to a unified physical model, it often occurs that one loses the other, and the response speed is slow, the economy is poor, and the installation and maintenance workload is heavy, which hinders the smooth progress of the power grid pollution control work.

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