Rated parameter adjustable series compensation design method

Abstract

The invention provides a rated parameter adjustable series compensation design method. The method comprises the following steps: step 1, determining the development stage of a power system, wherein a series compensation apparatus is in the power system; step 2, determining rated current and rate capacitive reactance of the power system in different development stages requiring compensation from the series compensation apparatus; step 3, optimizing the series compensation rated parameters of the power system in different development stages; step 4, determining series compensation capacitor expanding schemes of the power system in different development stages; and step 5, determining the parameters and expanding schemes of a series compensation overvoltage protection apparatus. According to the rated parameter adjustable series compensation design method, the parameters of the series compensation apparatus and the series compensation overvoltage protection apparatus are expanded in different stages according to the development stages of the power system, and the economical efficiency and the reliability of the series compensation apparatus are improved.

Description

technical field [0001] The invention relates to the technical field of long-distance power transmission, in particular to a series compensation design method with adjustable rated parameters. Background technique [0002] Series compensation technology can increase the transmission capacity of long-distance power transmission system and improve system stability. Series compensation has broad application prospects in power systems. In series compensation, capacitors are used to compensate the line impedance, thus improving the stability of the system. But during a transient, the short circuit current will cause a high voltage across the capacitor bank. Capacitors have a limited ability to withstand overvoltage, which must be limited to a certain level specified. Therefore, it is also necessary to install a certain overvoltage protection device. "MOV-parallel gap combination" is currently a widely used and mature overvoltage protection technology. figure 1 The wiring diagra...

AI Technical Summary

Problems solved by technology

[0010] ①: In the process of series compensation design, long-term system conditions, such as power grid structure, transmission flow, etc., are difficult to accurately estimate. The current practice is to select the rated current according to the long-term plan and consider a large margin, and build it in one go at the initial stage. If the actual power flow level of the system in a certain period or even the entire equipment cycle is significantly lower than the design level, it will be a huge waste for the project, and it may also have an adverse effect on reliability due to the large number of components

[0011] ②; Although a large margin is considered in the design, the system conditions may change unexpectedly. At this time, the series compensation and its overvoltage protection device are often unable to adapt, and still need to be modified

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