Area voltage stability monitoring method based on synchronous phasor measurement

Abstract

The invention relates to a regional voltage stability monitoring method based on synchronous phasor measurement, including the following steps: a heavy loading receiving end district in a system is selected as a monitoring object and synchronous sampling of regional total load and voltage and current phasors of the minor key load nodes within the region is completed by use of a synchronous phasor measuring apparatus; according to the continuous sampling data of voltage and current phasors, the voltage stability index of key nodes is calculated; the validity of the index of each node can be judged through examining whether the change between node load and the total load of the region where the node locates accords with approximate synchronous change; the maximum value of the effective stability index of all sampling load nodes at the same time and the same region is output as the stability index of the region. In the stage of frequent long-term voltage destabilization such as increasing regional load, the method can realize accurate and effective real-time assessment of system voltage stability and provides effective voltage stability information to operation personnel in time.

Description

technical field [0001] The invention belongs to the field of on-line monitoring of power system voltage stability. Background technique [0002] In order to ensure the stable operation of the power system and provide users with stable and economical electric energy, the power grid dispatching center must monitor the operation of the power system at any time, and evaluate the safety level of the system through security analysis. The monitoring of system voltage stability is one of them. an important aspect. [0003] The current monitoring and preventive control methods for voltage stability include the following three categories: [0004] 1. Low voltage load shedding. This type of method relies on local measurement equipment to implement control measures such as load shedding only based on the reduction value, delay value, and change rate of the node voltage amplitude. It does not rely on communication channels, and the control cost is low, simple, fast, and has many practi...

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Problems solved by technology

The most representative one is Khoi Vu et al. (Vu K, BegovicM M, Novosel D, et al. Use of Local Measurements to Estimate Voltage Stability Margin. IEEE Trans on Power Systems, 1999, 14(3): 1029-1035) The proposed index for predicting voltage instability by using the curve fitting method to track the "system-side Thevenin equivalent" parameters, but this method has the equivalent parameter drift (parameters drift) in practical applications

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