Series compensation circuit, system and method for power distribution network

Abstract

The embodiment of the invention discloses a series compensation circuit, system and method for a power distribution network. The circuit comprises a main line, an electricity utilization circuit, a capacitor bank and a control circuit, wherein the electricity utilization circuit is connected with the main line, the capacitor bank is connected with the electricity utilization circuit in parallel, and the control circuit is connected with the main line and the capacitor bank. The capacitor bank comprises at least one capacitor and at least one breaker and further comprises at least two parallel branches including the first branch and the second branch, wherein the first breaker and the first capacitor are sequentially arranged on the first branch, and the second capacitor is arranged on the second branch. The on-off of the capacitors on the branches in the capacitor bank is controlled, so that the on-off of part of the capacitors is achieved; a capacitance gradient with different levels is added to the circuit, so that line voltage regulation is smoother, and series compensation for the power distribution network is facilitated.

Description

technical field [0001] The invention relates to the technical field of relay protection, in particular to a distribution network series compensation circuit, system and method thereof. Background technique [0002] In the distribution network, the most widely used series compensation is the interconnection of the power grid with a voltage level of 220kV and above, the long-distance transmission of water and thermal power, and the strengthening of the connection between the grids. The basic principle of series compensation is that a capacitive device, such as a capacitor, is connected in series on the line, so that the capacitive reactance of the device cancels the reactance part of the line, thereby shortening the electrical distance between the power receiving end and the power transmitting end to increase the line load. transmission capacity. [0003] But the above is only for 220kV high-voltage line compensation, and the main purpose of installing a series compensation d...

AI Technical Summary

Problems solved by technology

[0004] In traditional capacitor series compensation devices, such as figure 2 As shown, the capacitor bank in the low-voltage series compensation is controlled by the isolating switch, and can only be switched on or off at the same time, but lacks the corresponding adjustment ability. Therefore, it cannot meet the requirements of the distribution network. Generate a large ground charging current, which will cause the protection equipment to malfunction

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