Three-phase current unbalance automatic control system and control method
An automatic control system, three-phase current technology, applied in the direction of reducing the asymmetry of multi-phase networks, eliminating/reducing asymmetry in multi-phase networks, etc. , to achieve the effect of improving equipment safety and power supply reliability
Inactive Publication Date: 2017-02-01
BEIJING HEROSAIL POWER SCI & TECH
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On the basis of traditional reactive power compensation, this method improves the control algorithm by adding phase-to-phase compensation, so that it has the functions of reactive power compensation and three-phase current unbalance adjustment. If the three-phase current unbalance is 10% or less, if the three-phase unbalance reaches more than 10%, this method cannot meet the three-phase current unbalance adjustment requirements.
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[0040] The present invention will be described in detail below with reference to the drawings and embodiments:
[0041] figure 1 The TA and TV respectively represent the current transformer and voltage transformer on the incoming line of the power user.
[0042] figure 1 The three poles of the insulated gate bipolar transistor described in the above are collector C, emitter E and gate G respectively. The gate G of the three-phase insulated gate bipolar transistor is respectively connected to the corresponding interface of the main control module through wires; the collector C is connected to the corresponding phase respectively; the emitter E is uniformly connected to the user's incoming line side line. figure 1 , It only shows the connection method of A-phase transistor. The connection method of B and C-phase is the same as that of A-phase.
[0043] The main control module of the commutation switch contains a DSP main control device to complete the collection and analysis of system ...
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The invention relates to a three-phase current unbalance automatic control system and control method. The three-phase current unbalance automatic control system comprises an intelligent phase-change switch assembly and a power distribution terminal control assembly, wherein the intelligent phase-change switch assembly is connected with the power distribution terminal control assembly, a three-phase current input end of the intelligent phase-change switch assembly is connected with a three-phase current, a three-phase current output end of the intelligent phase-change switch assembly is connected with a power user, the phase-change switch assembly is used for simultaneously receiving a control instruction of the power distribution terminal control assembly, and the intelligent phase-change switch assembly is used for enabling one of the three-phase current to communicate with the power user according to the control instruction of the power distribution terminal control assembly. According to the three-phase current unbalance automatic control system and control method, an insulated gate bipolar transistor is used as a main body switch module of an intelligent phase-change switch; the three-phase current unbalance of a power distribution area is timely and reasonably adjusted in a non-disturbance way by applying a mode that a power distribution terminal and the intelligent phase-change switch are matched; and the equipment safety and the power supply reliability of the power distribution area are improved.
Description
Technical field [0001] The invention relates to a three-phase current unbalance commutation method, and specifically, to a three-phase current unbalance automatic control system and control method. Background technique [0002] The low-voltage distribution network is an important part of the power system and an important facility for urban and rural construction. Due to the existence of a large number of single-phase loads in urban civil power grids and agricultural power grids, the current imbalance between three phases is particularly serious. The three-phase unbalanced current in the power grid will increase the copper loss of the line and the transformer, increase the iron loss of the transformer, reduce the output of the transformer, and even affect the safe operation of the transformer. It will also affect the accuracy of the electric energy meter and cause measurement loss, which seriously affects people. Production and life. [0003] In order to reduce the power loss in t...
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IPC IPC(8): H02J3/26
CPCY02E40/50H02J3/26
Inventor 杨敦高李振林刘玉刚王力陈平马庆玉
Owner BEIJING HEROSAIL POWER SCI & TECH