Transient voltage stability optimization control method for high-proportion new energy power grid

Abstract

The invention relates to a transient voltage stability optimization control method for a high-proportion new energy power grid. The method comprises steps of obtaining a transient voltage instabilitystate when a fault occurs; judging the transient voltage instability process; reserving the bus adjusting time; judging power loss of the instability state through the corresponding transient voltageunder the judgment of the continuous instability state; judging a compensation voltage and the power under the condition that the bus adjustment time range and the motor loss power are reserved; determining a compensation bus; the compensation bus compensating the unstable voltage and the unstable power for a motor set with the transient voltage instability of a power grid system. If that the corresponding voltage value in the bus serving as the main current load can be gradually restored is judged, that a transient state is stable after an accident is judged; that the system returns to the stable transient voltage and the power generation system enters a stable state is judged; the reactive power of the motor is directly used for power supplement, so the reactive power can correspond to the output power in real time, and resource waste is reduced.

Description

technical field [0001] The invention relates to the field of new energy grids, in particular to a transient voltage stability optimization control method for a high-proportion new energy grid. Background technique [0002] Based on the national conditions of the reverse distribution of energy resources and load demand, the State Grid Corporation of China put forward the strategic goal of "developing UHV AC transmission and building a strong national grid". The development of coal power, large hydropower, large nuclear power, and large renewable energy bases is of great significance to realize the optimal allocation of resources across the country. The voltage level of UHV AC transmission lines is high, and the capacitive charging power generated by the line capacitance per unit length increases significantly. When the end of the line is empty or light, the voltage at the end of the line will increase. When the line is faulty, an overvoltage will be generated, which will als...

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Problems solved by technology

[0006] At present, most of the research on dynamic reactive power optimization configuration for improving the transient voltage stability level is focused on the installation site optimization based on the post-fault limit cut-off time, transient voltage sag and acceptability index, and trajectory sensitivity, and the optimal selection of configuration capacity The research is only to meet the transient stability standard of the power grid as a measurement index, and there is little consideration from the economic input of the power grid. The lack of coordination between preventive control and emergency control may lead to the waste of resources. The present invention provides a high-proportion new energy grid temporary State voltage stability optimization control method

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