Reactive power compensation and harmonic governance system and control method for realizing power compensation and harmonic governance by using the same

A technology of harmonic control and control method, applied in reactive power adjustment/elimination/compensation, AC network to reduce harmonics/ripple, harmonic reduction devices, etc., can solve the problems of waste of compensation capacity and high system cost, Achieve the effect of suppressing resonance, saving system cost and good social and economic benefits
CN101741093AInactive Publication Date: 2010-06-16哈尔滨同为电气股份有限公司 +1
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
哈尔滨同为电气股份有限公司
Publication Date
2010-06-16
Estimated Expiration
Not applicable · inactive patent

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Abstract

A reactive power compensation and harmonic governance system and a control method for realizing power compensation and harmonic governance by using the same belong to the field of an electric system and solve the problems that the prior reactive power compensation technique cannot synchronously realize the full compensation for the electric network while meeting the reactive power compensation of continuous change, compensating capacity has waste and system cost is high. The system of the invention uses the structure that M groups of TSCs are connected to the electric network in parallel, the three-phase output ends of SVG are respectively connected to one end of an inductor, the other end of each of three inductors is respectively connected the three phases of the electric network. The control method of the reactive power compensation and the harmonic governance comprises: processing the collected electric current values and voltage values by a controller, obtaining the control parameters of the TSC according to a switching rule for realizing stage reactive power compensation, obtaining the control parameters of the SVG by combining with an instantaneous reactive power theory for realizing the compensation of the residual reactive power between each two stages. The invention realizes the quick and continuous reactive power compensation and the harmonic governance under the condition that load contains harmonic current, and is used for the reactive power compensation of the electric system.
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Description

technical field

[0001] The invention relates to a reactive power compensation and harmonic control system and a control method using the system to realize reactive power compensation and harmonic control, belonging to the field of electric power systems. Background technique

[0002] In the existing power distribution system, there are many equipment with frequent and drastic changes in reactive power, such as rolling mills, injection molding machines, asynchronous motors (soft start) and port cranes, etc., which often cause problems of voltage drop and low power factor, which not only makes The line loss of the distribution network increases, and at the same time, it will cause great harm to some precision equipment with high quality requirements for power supply voltage. Therefore, the requirements for reactive power compensation devices are higher. Existing reactive power compensation devices for distribution networks mainly include passive fixed capacitors, thyristor swi...

Claims

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