Low-voltage power distribution network voltage control system and method

Abstract

The invention discloses a low-voltage power distribution network voltage control system and method. The low-voltage power distribution network voltage control system comprises a distribution transformation port control module, a line tail end control module and a main control module, wherein the distribution transformation port control module is used for performing reactive compensation and load balance adjustment for the power distribution network line according to the corresponding control signal of the main control module; the line tail end control module is used for performing reactive compensation and voltage adjustment for the tail end load of the power distribution network line according to the corresponding control signal of the main control module; and the main control module is used for obtaining the three-phase voltage current of the distribution transformation port and the position of a distribution transformation tap, calculating the reactive power and the degree of unbalance in the distribution transformation port, obtaining the three-phase voltage current at the tail end of the power distribution network, calculating the reactive power at the tail end of the power distribution network, and sending out corresponding control signals to the distribution transformation port control module and the line tail end control module respectively. According to the low-voltage power distribution network voltage control system and method, the low-voltage power distribution network can be optimized, the voltage quality can be improved; and in addition, the optimal reactive power, degree of unbalance and voltages in each position of the line are achieved.

Description

Technical field [0001] The present invention relates to the field of electric power technology, in particular to a low-voltage power distribution network voltage control system and method. Background technique [0002] In the low-voltage power distribution network, especially in the rural power network, due to the large power supply radius, the voltage at the end of the power supply line is much lower than the voltage at the power distribution port. The distribution port is a 400V distribution network, and the phase voltage at some loads in the actual measurement can even be as low as 150V, which seriously affects the quality of electricity. [0003] At present, the commonly used improvement methods include: (1) adding new transformers to improve the layout of the power supply network; (2) replacing wires with smaller cross-sections with wires with larger diameters; (3) installing reactive power compensation at power distribution ports Device to reduce reactive power loss; (4) Adj...

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Problems solved by technology

But all there are some problems in above-mentioned each method: method (1) and method (2) cost are too high, and implementation difficulty is bigger, and feasibility is relatively poor; Method (3) and method (5) improve the effect of voltage not Obviously, especially the voltage at the end of the load does not change much; when using method (4), if the voltage at the end of the load is adjusted to the standard, there will inevitably be a risk of overvoltage at the distribution transformer port, especially during low load periods. There is a power supply safety hazard

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