A series-parallel comprehensive compensation device for low-voltage control of distribution network

Abstract

The invention relates to a series-parallel connection comprehensive compensation device for power distribution network low-voltage treatment. The series-parallel connection comprehensive compensation device comprises a series connection compensating module, a parallel connection compensating module, and a controller. The series connection compensating module is disposed in a main loop circuit and is connected with a rapid vacuum switch in the main loop circuit. The parallel connection compensating module is connected with the main loop circuit through a vacuum contactor. The controller is connected with the rapid vacuum switch and the vacuum contactor and is used for controlling the operation of the series connection compensating module and the parallel connection compensating module via the rapid vacuum switch and the vacuum contactor according to the voltage and the load at the tail end of a power distribution network system. Compared with a product in the prior art, the series-parallel connection comprehensive compensation device is simultaneously provided with the series connection compensating module and the parallel connection compensating module, comprehensively controls a series capacitor loop circuit and a parallel capacitor loop circuit according to a system requirement, may change circuit reactance and system reactive power flow, and may absorb harmonic waves so as to greatly enhance the voltage regulating capability and range of a device.

Description

technical field [0001] The invention relates to the field of low-voltage control of distribution networks, in particular to a series-parallel comprehensive compensation device for low-voltage control of distribution networks. Background technique [0002] Qualified voltage quality is not only the need for production and life of electricity customers, but also an important condition for power supply companies to ensure the safety, reliability and economic operation of the power grid. The distribution network is a power network that directly supplies electricity to customers. Voltage quality is particularly important, especially when the power supply radius exceeds a reasonable length, the line voltage loss is too large, and the terminal voltage is too low, showing the characteristics of heavy load, long line, and large charging power. If the line is transformed, the project cost will be relatively high. High, long construction period, and heavy workload; the traditional simpl...

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Problems solved by technology

Voltage quality is particularly important, especially when the power supply radius exceeds a reasonable length, the line voltage loss is too large, and the terminal voltage is too low, showing the characteristics of heavy load, long line, and large charging power. If the line is transformed, the project cost will be relatively high. High, long construction period, and heavy workload; the traditional simple parallel compensation is better for low power factor loads, and it is easy to overcompensate when the power factor is high, and the adjustment method is single and the adjustment range is limited, which is difficult to meet the safety requirements. Electricity requirements; the single installation of series capacitors can reduce the line impedance, which is equivalent to reducing the power supply radius, but due to the constraints of the system short circuit level, the compensation degree is limited, and it cannot absorb the harmonics generated by the load. When the load increases, the voltage exceeds the control range of the series capacitor, or the load fluctuates too much, simply using the series capacitor cannot achieve good results

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