Online Evaluation Method and Application of Frequency Strength of Provincial Asynchronous Power Grid
The partition asynchronous interconnection of power systems and the replacement of traditional synchronous machines by large-scale new energy sources reduce the frequency strength of the power system and increase the risk of frequency instability.At this time,online evaluation of system frequency strength and monitoring system frequency stability margin are of great significance to the safe and stable operation of the system.Therefore,an online evaluation method of frequency strength suitable for the actual provincial asynchronous power grid is proposed,including three parts:data acquisition and preprocessing,simplification of system frequency modulation model and system frequency strength evaluation.Firstly,based on the operation control system,the operating condition information such as the startup and output of each device in the system is obtained,and the dynamic model library of the frequency regulation of devices in the system is established through the BPA data and data in the wide area measurement system.Secondly,the order of device model is reduced by the unified structural approximation method,then the frequency strength indexes such as frequency drop depth coefficient and slope coefficient are calculated to evaluate the system frequency strength.Finally,the developed frequency strength online evaluation system based on the proposed evaluation method and its application in the actual power grid are introduced.
frequency stabilityfrequency strengthunified structural modelonline evaluationasynchronous power grid
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