Three-phase load unbalance compensator
A technology of balanced compensation and three-phase load, applied in reactive power compensation, multi-phase network asymmetry reduction, reactive power adjustment/elimination/compensation, etc., can solve problems such as few studies on three-phase load unbalanced compensators , to achieve stable and fast three-phase balance control effect, improve system power factor, and fast response effect
Inactive Publication Date: 2013-08-21
STATE GRID CORP OF CHINA +1
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[0005] At present, the research and application of static inverters by research institutions at home and abroad are mostly focused on static var generators, active filters and other devices, specifically for the use of static inverters in the research of three-phase load unbalance compensators in domestic low-voltage distribution networks. rare
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[0018] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the specific implementation manners thereof will be described in detail below with reference to the accompanying drawings:
[0019] See figure 1 , The three-phase load unbalance compensator of the present invention includes a current sampling device, a DSP controller 1, a PI controller 2, a photocoupler 3, and a rectifier inverter circuit 4 connected in sequence. The current and voltage sampling devices include Four current transformer CTs on phase, B phase, C phase and neutral line N 1 , CT 2 , CT 3 , CT 4 , Current transformer CT 1 , CT 2 , CT 3 And CT 4 All are connected with DSP controller 1. The current sampling device collects the current signal of the load circuit and feeds the collected current signal to the DSP controller 1. The DSP controller 1 analyzes and calculates the current signal collected by the current sampling device to obtain the current si...
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The invention discloses a three-phase load unbalance compensator which comprises a current sampling device, a DSP (digital signal processor) controller, a PI (proportional-integral) controller, a photoelectric coupler and a rectification inversion circuit which are connected sequentially, wherein the current and voltage sampling device comprises four current transformers arranged on an A phase line, a B phase line, a C phase line and a neutral line N respectively; each current transformer is connected with the DSP controller; and the rectification inversion circuit comprises a three-phase four-leg inversion circuit, four inductors and a capacitor. According to the three-phase load unbalance compensator, the three-phase four-leg inversion circuit is applied to the three-phase load unbalance compensator, so that the three-phase load unbalance compensator is high in response speed and precision, can obtain a stable and fast three-phase balance control effect, and realizes comprehensive compensation for reactive power and negative sequence components of a system.
Description
Technical field [0001] The invention relates to a three-phase load unbalance compensator, which belongs to the technical field of low-voltage power distribution networks. Background technique [0002] With the development of social economy and the use of various electrical appliances, the electricity load of residents has increased greatly, and civil electricity is used in single-phase systems, so the three-phase load imbalance of the power distribution system is very prominent and serious. Increasing line loss and distribution transformer loss will also cause the unbalance of the three-phase voltage of the line, which will have a serious impact on the quality of power and power supply. It will also accelerate the aging of the distribution transformer and reduce the output of the distribution transformer. Existing load balancing devices are all based on the traditional method of switching inductance and capacitance with a composite switch, which has poor use effect and is very in...
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IPC IPC(8): H02J3/26H02J3/18
CPCY02E40/30Y02E40/50
Inventor 刘静郑建平陈喆张臻元季旻赵艳敏李亮沈祎钟筱怡杨蕙郑刚金铭顾志浩
Owner STATE GRID CORP OF CHINA