Distribution network electric energy quality composite control system and controlling method thereof

Abstract

The invention discloses an electric energy quality compound control system for an electric distribution network. The system comprises an industrial computer, a DSP control board, a transformer decision terminal and an SVC device which is hung on the electric distribution network, wherein, the DSP control board accessed to the SVC device is connected with the electric distribution network by a voltage transformator and a current transformator; the SVC device and the transformer decision terminal are both connected with the industrial computer by the DSP control board; the high-voltage static var compensator (SVC) consists of an MSC (mechanical switching capacitor bank) connected in star and a TCR (thyristor control reactor) connected triangularly. The invention also discloses a novel electric energy quality compound controlling method for the electric distribution network corresponding to the control system, so as to effectively compensate system reactive power, improve power factor and overall level of the electric energy quality of the electric distribution network, thereby having great importance and engineering application value for comprehensive management to the electric distribution network such as energy conservation and consumption reduction.

Description

technical field [0001] The invention relates to a composite control system and a control method for power quality of a distribution network. Background technique [0002] With the change of power system operation status and load, the voltage of distribution network changes all the time. In order to provide users with high-quality power, comprehensive control of power quality must be carried out. At present, the distribution network generally adopts the adjustment of transformer taps and switching capacitor banks to achieve the purpose of adjusting voltage and reducing losses. The application status of domestic reactive power compensation devices is that static var compensation devices (SVC) are widely used, mainly including two types: mechanical switched capacitor (MSC) + thyristor controlled reactor (TCR) and thyristor switched capacitor (TSC) . Since the TSC type SVC can only be adjusted in stages, in practice, the MSC+TCR type SVC is widely used. [0003] At present, t...

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Problems solved by technology

[0004] The economical operation of transformers is an important link in the field of complex control of power quality in distribution networks. If the economical operation parameters of transformers are included in the overall power quality control system, it is very necessary for optimal control, but the current unified adjustment technology does not consider To the economical operation parameters of the transformer, the fixed compensation capacitor bank used is difficult to achieve accurate reactive power compensation, and the adjustment accuracy is rough

Most substations run transformers at full load or even overload just to pursue high load rate. The comprehensive power loss of transformer alone accounts for more than 30% of the total loss of distribution network, which is a huge loss.

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