An optimal control method for transient voltage stability of high-proportion new energy grid

Abstract

The invention relates to a high-proportion new energy grid transient voltage stability optimization control method, comprising the following steps: obtaining the transient voltage instability state when a fault occurs; determining the process of the transient voltage instability; reserving the time for busbar regulation; Under the judgment of continuous instability, the corresponding transient voltage is used to determine the power loss of the unstable state; the compensation voltage and power are determined under the time range of the reserved bus adjustment and the power loss of the motor; the compensation bus is determined; the compensation bus to the power grid system The generator set with transient voltage instability compensates for the unstable voltage and unstable power; if it is determined that the corresponding voltage value in the bus as the main current load can gradually recover, it is determined that the transient stabilizes after the accident; it is determined that the system returns to the transient state When the voltage is stable, the power generation system enters a stable state; judging that the power grid is in a stable state, the present invention directly uses the reactive power of the motor to supplement power, so that the reactive power and the output power can correspond in real time, reducing waste of resources.

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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