A unit speed regulation system control parameter setting method considering frequency modulation and stability constraints

Abstract

The invention provides a unit speed regulation system control parameter setting method considering frequency modulation and stability constraints. The method comprises the following steps: S1) carrying out analysis on stability of a possible isolated-network-operation hydropower unit speed regulation control system; S2) obtaining a range of control parameters with primary frequency modulation performance constraint of a unit being taken into consideration; S3) under the premise of meeting small disturbance stability, giving a range of control parameters of the unit speed regulation system; S4) obtaining unit prime motor and speed regulation system measured parameters through actual measurement modeling, and obtaining overlap based on the ranges of the control parameters and applying the data to simulation analysis verification instances of the setting method; and S5) for a primary frequency modulation parameter setting range and a small interference stability parameter stability range, carrying out overall consideration, and finally, obtaining a parameter value range capable of meeting both frequency modulation performance requirements and small interference stability requirements, and carrying out setting on the unit speed regulation system model parameters. The method can obtain parameter values meeting both requirements under the premise of meeting double-term index requirements.

Description

technical field [0001] The invention relates to the technical field of power system simulation modeling, in particular to a research on a coordinated optimization setting method for operation control parameters of a speed regulation system of a hydroelectric unit considering frequency regulation and stability constraints. Background technique [0002] With the construction of large-scale, long-distance direct current transmission lines, the connection between the major regional power grids is getting closer and closer, and the influence of power system disturbances is becoming wider and wider. In order to analyze the cause of the disturbance and propose improvement measures, at present, simulation analysis and other means are mainly used for accident inversion, which in turn depends on a reasonable and accurate simulation model. In particular, on January 23 and September 19, 2015, the power oscillation of central Tibet power grid caused the load shedding event, and the Jinsu...

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Problems solved by technology

[0004] At present, the research on the speed control system model of thermal power units has achieved remarkable results. The electromechanical transient, medium and long-term time scale models have been applied to actual production. Relatively speaking, the modeling of the speed control system of hydropower units involves the modeling of water diversion pipelines and the dynamic process of water turbines. , for different types of hydraulic turbines (vertical shaft mixed-flow units, axial-flow propeller units, pumped-storage units) there are great differences in prime movers. Research on the optimization and setting of control parameters of hydroelectric units is relatively rare, which makes the power industry insufficiently reserve or pay attention to it. The "1.23" incident of Zangmu Power Plant highlights the importance of correct and reasonable adjustment of the speed control system of hydroelectric units

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