Simulation calculation method for frequency emergency control strategy of multi-DC feed-in electrical network

Abstract

The invention discloses a simulation calculation method for a frequency emergency control strategy of a multi-DC feed-in electrical network, and belongs to the fields of automation technology of the power system and operation control technology of electrical network scheduling. According to the invention, frequency emergency control after a fault is divided into two levels; based on once time-domain simulation, a frequency characteristic is analyzed, and a load frequency factor of the whole network is estimated; a load frequency adjusting characteristic is calculated, and priorities of three types of controllable measures including pumped storage pump switching load of emergency control, emergency improved DC power control and emergency load switching control are taken into consideration, and algebra calculation is used to obtain the total control amount of two levels and three types of emergency control measures of the whole network; when the second level of emergency control measure is calculated, an effect after implementation of the first level of emergency control measure and a primary frequency modulation effect of a generating set are calculated. According to the invention, technical support is provided for different types of controllable recourses and emergency control frequency of the multi-DC feed-in reception end electrical network, a frequency safety control target is achieved comprehensively, and emergency control benefit of frequency safety and reliability is improved.

Description

technical field [0001] The invention belongs to the technical field of power system operation control. Specifically, the invention relates to a method for simulating and calculating the frequency emergency control strategy of multiple direct current feed-in power grids. Background technique [0002] The frequency characteristics of the power system directly have an important impact on the safety, stability and power quality of the system. After a large power loss fault occurs, reducing the frequency fluctuation range and ensuring the frequency is within the allowable range is one of the important tasks for the safe and stable operation of the power grid. For this reason, on the one hand, relevant technical management standards have clear requirements for the minimum frequency in the dynamic process after a fault and the steady-state frequency after recovery; on the other hand, a lot of theoretical research has been carried out, and in the practice of long-term power grid ope...

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Problems solved by technology

[0005] Calculation of frequency security and stability control strategies is a very complicated task. Taking into account the frequency regulation characteristics of generator sets and loads, comparing the cost performance of different control strategies, and selecting suitable control measures from a large number of candidate measures, it is usually necessary Failure, repeated simulation calculations, time-consuming and labor-intensive

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