Low-voltage three-phase load imbalance adjusting system and method
A load imbalance and adjustment method technology, applied in the direction of multi-phase network elimination/reduction of asymmetry, multi-phase network asymmetry reduction, etc., can solve the problem of low tolerance of three-phase load imbalance and user-side commutation risk control Insufficient and other issues
Active Publication Date: 2019-03-12
STATE GRID ZHEJIANG TONGXIANG POWER SUPPLY
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Problems solved by technology
[0005] The technical problem to be solved by the present invention is: the current low-voltage three-phase load unbalance adjustment method has insufficient control of user-side commutation risk and low tolerance to short-term three-phase load unbalance
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[0029] The specific embodiments of the present invention will be further specifically described below through specific embodiments in conjunction with the accompanying drawings.
[0030] Such as figure 1 As shown, it is a flow chart of the low-voltage three-phase load unbalance adjustment method, including the following steps: A1) set the time t of the day 0 To adjust the time point, set the three-phase load imbalance threshold β x ; A2) The control terminal collects and stores the three-phase current at intervals T, and the remote commutation switch records the load current connected to it at intervals T and sends it to the control terminal, and enters into step A3 after collecting for 24 hours; A3) respectively Calculate the three-phase load unbalance degree collected for the ith time Then calculate the average value of all collected three-phase load unbalance as the three-phase load unbalance A4) If The control terminal controls the action of the remote commutation s...
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The invention relates to the field of electric power systems, and specifically relates to a low-voltage three-phase load imbalance adjusting method and system. The low-voltage three-phase load imbalance adjusting method is characterized in that the method includes following steps: A1) setting an adjustment time point and setting a threshold betax; A2) acquiring a three-phase current with an interval time T by a control terminal, recording a connected load current with the interval time T and transmitting the load current to the control terminal by a remote phase-change switch, and entering step A3 after acquisition for 24 hours; A3) calculating a three-phase load imbalance degree betaphi; and A4) if betaphi is greater than betax, controlling the motion of the remote phase-change switch andadjusting three-phase load distribution by the control terminal. The substantial effects of the method and system are that high tolerance degree is achieved for short-time three-phase load imbalance,frequent phase change of a user side due to short-time three-phase load imbalance is avoided, the phase-change motion is performed when a historical average load is minimum, and the risk of phase change of the user side is reduced as much as possible.
Description
technical field [0001] The invention relates to the field of power systems, in particular to a low-voltage three-phase load unbalance adjustment system and method. Background technique [0002] At present, most distribution transformers in urban and rural distribution networks use three-phase transformers, and the three-phase load at the transformer outlet should be symmetrical in theory. Single-phase load, with the rapid development of rural economy, farmers' life is generally improved, high-power household appliances (air conditioners, electric heaters, induction cookers, microwave ovens, electric water heaters, single-phase water pumps, etc.) are increasing, and the load gap between users is widening. At the same time, rural residents build a large number of new houses, and the load migration causes changes in the load distribution of the entire station area. Irregularity and unpredictability of user load imbalance lead to long-term imbalance of three-phase load in low-v...
Claims
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IPC IPC(8): H02J3/26
CPCH02J3/26Y02E40/50
Inventor 朱晟宇金伟强顾培生姚星良陆伟杰徐天相
Owner STATE GRID ZHEJIANG TONGXIANG POWER SUPPLY