Abstract
During the switching operation of the non-load power transmission lines, the undisired switching overvoltage issue is inevitable, causing grid voltage oscillations, waveform distortion and other phenomena at the end of the non-load power transmission lines, and even lead to the insulation breakdown, all above phenomena probably make the power transmission failure. To avoid the above harmful cases, the formation mechanism of the undisired switching overvoltage issue caused by switching non-load power transmission lines is first analyzed in detail. Based on this mechanism analysis, the energy storage system (ESS) based overvoltage suppression method and corresponding ESS voltage command synthesis algorithm are developed. The method can quickly and effectively restrain the voltage change rate and reduce the voltage difference between the initial value and the steady state value of the power transmission lines, so that the line voltage during the switching operation can be kept within the safety limit range. Finally, a simulation model was built by using MATLAB/Simulink software, and the simulation results verified the effectiveness of the proposed overvoltage suppression strategy.
Highlights
As the proportion of renewable energy sources in the grid continues to increase, more and more renewable energy power plants are established in remote areas [1]
The main factors that effect the close overvoltage are analyzed, and the results demonstrated that the amplitudes of the switching overvoltage were mainly related to the close phase angles with its range from 1.17p.u to 2.14p.u., which is useful to look for the best close phase angles
Based on the energy storage system (ESS) application, the corresponding ESS voltage command synthesis algorithm is developed. This method can quickly and effectively restrain the voltage change rate and reduce the voltage difference between the initial value and the steady state value of the power transmission lines, so that the line voltage during the switching operation can be kept within the safety limit range
Summary
As the proportion of renewable energy sources in the grid continues to increase, more and more renewable energy power plants are established in remote areas [1]. Kou analyzed Henan power circuit breakers with closing resistors operation, and switching overvoltage and surge arrester energy absorption were simulated without the closing resistor for a typical substation. They have not put forward any effective methods or strategies to decrease and suppress the undesired switching overvoltage. Based on the ESS application, the corresponding ESS voltage command synthesis algorithm is developed This method can quickly and effectively restrain the voltage change rate and reduce the voltage difference between the initial value and the steady state value of the power transmission lines, so that the line voltage during the switching operation can be kept within the safety limit range.
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