Voltage stabilization on-line monitoring method based on wide area measuring system

Abstract

A voltage stabilization on-line monitoring method based on a wide area measuring system is characterized by comprising the steps of defining voltage stabilization indexes, perfecting the voltage stabilization indexes, processing load and electric generator collinear nodes, building a basic framework and a processing flow for voltage stabilization on-line monitoring, and the like. Voltage weakness nodes in the system can be recognized accurately, and high robustness is achieved. The load and electric generator collinear nodes are processed by adopting an electric generator inside potential expanding method, influences on system voltage stabilization caused by electric generators and loads on the collinear nodes are taken into consideration effectively, the defect that power injection of load nodes in the collinear nodes is not taken into consideration in a traditional processing method is overcome, model precision is high, and calculation errors are small. Real-time performance and accuracy of wide area measuring information and reliability and stability of EMS network topology information are integrated, system voltage stabilization information can be obtained only by collecting phasor measuring information of the system once, the problem that repeated collection leads to identification parameter drift is solved, and voltage stabilization on-line monitoring accuracy is improved.

Description

technical field [0001] The invention belongs to the field of electric power system and its automation. More precisely, the invention relates to a voltage stability online monitoring method based on a wide-area measurement system. Background technique [0002] With the rapid development of the electric power industry and the continuous expansion of the scale of the receiving system, especially the rapid growth of power load and the gradual increase in the proportion of the highest power load, the power supply construction of the receiving system is insufficient, and a large amount of electric energy needs to be transmitted over long distances, forcing the receiving system The dependence on power outside the region continues to increase, and the main contradiction in the safe and stable operation of the power grid has transformed from the problem of power angle stability to the problem of voltage stability. Constrained by factors such as the environment and construction costs,...

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Problems solved by technology

1) On-line monitoring of system voltage stability based on branch circuit measurement information Assume that at a certain time section, the branch circuit of the system can be regarded as an infinite power supply supplying power to the load. When the system voltage is critically stable, the power of the branch circuit reaches the limit. This method only needs to search the key branches of the system, avoiding the identification and tracking of Thevenin parameters, but this method is only effective in special cases, and the theoretical basis is weak

2) The theoretical basis of on-line monitoring of system voltage stability based on node measurement information is that when the system voltage is critically stable, the power consumed by the load node is the largest, and the impedance modulus of the load node is equal to its Thevenin equivalent impedance modulus at this time. The theoretical foundation is solid, but there is a problem of equivalent parameter drift in the process of Thevenin equivalent, and the calculation error is large

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