Abstract
A PMU-based algorithm of synchronous generator stability prediction is proposed and tested in the paper. The algorithm is based on the application of the equal area criterion for the following spaces: active power – load angle, active power – time. The deceleration area is formed using the least squares curve fitting by the second order polynomial. The algorithm was tested on the single synchronous machine power system. A number of transients was simulated with the power angle curve polynomial accuracy of 50 ms. The results have shown high adaptability and efficiency of the proposed algorithm. It can be used in adaptive protection and control devices to form control actions aimed at ensuring the stability of a power system operation.
Highlights
There are significant changes both in the principles of power systems (PS) control and in the composition of theirs equipment, namely one that is generating and consuming electricity
The problem of analyzing transient stability (TS) of a complex PS is solved on the basis of equivalent circuits for the PS under protection, which are mathematical models, the parameters of which are most often set according to rated data or data tests and may greatly differ from the actual ones [2]
The algorithm allowing to predict TS according to phasor measurement unit (PMU) data is proposed and tested in the paper
Summary
There are significant changes both in the principles of power systems (PS) control and in the composition of theirs equipment, namely one that is generating and consuming electricity. The PS changes are based on digital transformation and the introduction of new mechanisms for the operation of the electricity and capacity markets. The introduction of a significant number of renewable energy sources (RES) and energy storage systems (ESS) [1], as well as technology of the demand response, lead to an increase in irregular components of active power flows. The introduction of low-carbon generation leads to a decrease in the total inertia of a PS and an increase in the requirements for the response speed of emergency control to ensure transient stability (TS). In the changing conditions of PS operation, increased requirements for speed and accuracy are imposed on the emergency control systems. The purpose of the paper is to develop and test an algorithm for predicting a TS based on the equal area criterion in the time domain and in the area of load angles of a synchronous generator (SG)
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