A low-voltage distribution network power quality comprehensive control device

Abstract

The invention discloses a comprehensive electricity quality control apparatus for a low-voltage distribution network. The comprehensive electricity quality control apparatus comprises a control module, a voltage adjusting module and a reactive compensation module, wherein the control module respectively controls the voltage adjusting module and the reactive compensation module, the input lines of the low-voltage distribution network are connected with the output lines of the low-voltage distribution network through an overvoltage adjusting module and the reactive compensation module, and the voltage adjusting module is a voltage bidirectional adjusting module. Unstable voltage due to voltage fluctuation is effectively prevented by employing voltage compensation graded and bidirectional adjustment and the intelligent time-delay function of a composite switch, and current impact of a conventional contactor switching is reduced by a composite switch in a reactive compensation module. The system loss is minimized, and the safety of the apparatus is guaranteed. A man-machine interface is employed to facilitate operation and maintenance, and a remote transmission means is employed to further improve the monitoring capability on a power grid. The comprehensive electricity quality control apparatus for a low-voltage distribution network can be widely applied to the low-voltage distribution field.

Description

technical field [0001] The invention relates to the field of low-voltage power distribution, in particular to a comprehensive control device for power quality of low-voltage distribution network. Background technique [0002] my country's rural and urban-rural suburban low-voltage distribution network has a large scale and long lines, and the 400V / 220V low-voltage network lines are in zero-distance contact with the majority of users. With the development of the rural economy and the deepening of the policy of sending home appliances to the countryside, various high-power household appliances appear in farmers' homes. A series of problems such as high reactive power, increased reactive power, decreased power factor, and decreased power quality. The operation status of the rural power distribution station area is as follows: 1) Due to the seasonality of agricultural production and the mobility of rural workers, the load of the rural power grid fluctuates greatly; 2) It is far...

AI Technical Summary

Problems solved by technology

Capacitive reactive power compensation is to indirectly increase the terminal voltage by reducing the reactive current and reducing the voltage drop, which is suitable for lines with low power factor and inductive current; traditional on-load voltage regulators increase the line by adjusting the transformation ratio of the transformer. The head-end voltage of the low-voltage side is suitable for occasions where the output voltage of the low-voltage side of the transformer is low due to the length of the 10KV line; For indoor occasions with low power requirements such as homes or laboratories

On the whole, the technical methods adopted by the above-mentioned existing devices all have a single function, narrow application range, and inconvenient installation and maintenance, and the switching of the compensation capacitor adopts the contactor method, which not only takes a long time, but also takes a long time during the switching process. The impact current is large, resulting in large losses, and affecting the stability and service life of the system

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