Short-term-voltage stability control method for electric power system

Abstract

The invention discloses a short-term-voltage stability control method for an electric power system. In the method, firstly, through an on-site measurement mutual inductor, the operation state of the electric power system is measured and through state estimation calculation, steady-state operation data of system operation is obtained and a reactive optimization non-linear programming model based on an optimal power flow is constructed and then system dynamic data is extracted from a stability database of the electric power system; and a differential-algebraic equation set which describes system dynamic characteristics and an initial value equation thereof are constructed and according to the steady-state data and the dynamic data, modeling is carried out on a dynamic reactive compensation device and then a dynamic optimization model is constructed and finally the dynamic reactive optimization model based on the stability-constraining optimal power flow is solved. A reactive standby optimization result is coded into a control instruction and transmitted to an on-site generator and the reactive compensation device through a remote control system of the electric power system. The short-term-voltage stability control method for the electric power system is capable of accurately calculating an optimal dynamic reactive standby scheduling scheme during system operation and improving the short-term-voltage stability of system operation.

Description

technical field [0001] The invention belongs to the technical field of operation scheduling and stability control of a power system, and in particular relates to a short-term voltage stability control method of a power system. Background technique [0002] In order to pursue the economy of operation, modern power systems are usually scheduled to run under heavy load conditions, so as to realize the wide-area optimal configuration, transmission and consumption of power and energy. Factors such as complex power market constraints, expensive transmission line construction, and multiple relay protection modes further aggravate the load conditions of the power system, making it very likely that the power system will operate outside its stable domain, resulting in a loss of system reliability. When the system is disturbed, especially under large disturbances, the short-term voltage instability of the system will be formed, which will lead to major blackouts and cause great economi...

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Problems solved by technology

In fact, when the system is subjected to a large disturbance, the system is very likely to experience transient instability. The transient performance of the system after the disturbance cannot meet the short-term voltage stability criteria, including the low voltage ride through (Low Voltage Ride Through, LVRT) on the power generation side. Problems and load side fault delay voltage recovery (Fault-induced Delayed Voltage Recovery, FIDVR) problem

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