Voltage automatic compensation device

Abstract

The invention discloses a voltage automatic compensation device and relates to the technical field of reactive compensation optimal configuration devices of power supply systems. The voltage automatic compensation device comprises a tank body. An input end of the voltage automatic compensation device is connected with an input end of an automatic compensation controller through a connection terminal, an output end of the automatic compensation controller is connected with a control end of a three-phase independent-compensation composite switch which is connected with a three-phase independent-compensation capacitor C1, the output end of the automatic compensation controller is connected with a control end of a contactor which is connected with a three-phase common-compensation capacitor C2, and an A phase line, a B phase line, a C phase line and a zero line N are respectively connected with the three-phase independent-compensation composite switch and the contactor through connection terminals. The voltage automatic compensation device can effectively compensate reactive load of a low-voltage line, improves the line voltage, solves the problem of unbalanced three-phase load simultaneously, accordingly, increases the power factor, and reduces electric energy loss.

Description

technical field [0001] The invention relates to the technical field of reactive power compensation optimization configuration devices for power supply systems, in particular to an automatic voltage compensation device. Background technique [0002] At present, with the rapid popularization of high-power household appliances such as air conditioners, refrigerators, and induction cookers, residents' electricity consumption is increasing at an average annual rate of 20% to 30%. The rapidly increasing situation of residential electricity consumption has made the problem of gradually low voltage at the end of low-voltage lines increasingly serious, which has brought great inconvenience to the majority of electricity customers and also brought great challenges to the high-quality services of power supply companies. Voltage has become the focus of general attention of current power customers. [0003] In order to solve the problem of low voltage at the end of low-voltage lines, tr...

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Problems solved by technology

However, the new assembly requires a large investment and a long cycle, and it is difficult to coordinate the line corridor and land occupation issues; increasing the diameter of the low-voltage wires is also blocked everywhere because the low-voltage lines are often erected along the wall, and the low-voltage problem is difficult to solve quickly

In addition, as the power load continues to increase, the reactive load increases rapidly, resulting in a high low-voltage line loss rate, which seriously affects the economic and even social benefits of power supply companies.

[0005] In the investigation and research of the electricity market, it is found that in the low-voltage power supply and distribution system with a large number of single-phase loads, the randomness of the load change will lead to a serious imbalance of the three-phase load, such as the low-voltage power supply of civil buildings such as buildings and residential quarters. In the power distribution system, due to the existence of a large number of single-phase loads (such as lighting fixtures, household appliances, office equipment, computers, etc.) The three-phase balance is completely meaningless in actual operation, which leads to the serious unbalance of the three-phase load of the low-voltage power supply and distribution system in stages

This imbalance is irregular, cannot be predicted in advance, and cannot be effectively improved.

In addition, the power factor of each phase load is also different, which often makes the reactive power to be compensated in each phase circuit very different. Effective compensation of reactive loads cannot solve the problem of unbalanced three-phase loads, and all single-phase compensations require a large investment

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