为提高电力系统稳定分析计算的准确性和电网调度对试验机组生产调度的科学性,对某300 MW混流式水电机组进行水轮机调节系统控制参数测试和建模分析。以试验机组水力机械特性和调速系统实际控制逻辑为依据,兼顾调节控制的死区、限幅、延时、非线性函数等因素导致的非线性特性和仿真计算的方便简约性,在MatLab/Simulink中对水轮机调节系统的电气控制、液压系统和原动机3个环节进行建模;针对原动机环节分别建立了电力系统分析综合程序通用模型和自定义模型;对模型参数进行了现场实测和仿真辨识,并对电力系统分析综合程序通用模型和自定义模型进行比较分析。结果表明自定义模型参数能更好地反映机组设备本身的动态响应特性。该模型的建立为水电机组电力稳定计算分析领域的完善和发展提供了参考。
Abstract
In an attempt to improve the accuracy of stability calculation for power system and the scientificity of test unit’s production operation by power grid dispatch, control parameters testing and modelling for the turbine governing system of a 300 MW mixed flow hydropower unit were performed as a case study. On the basis of the hydraulic machinery features of the test unit and the actual control logic of the governing system, the electrical control, hydraulic system and prime mover of the governing system were modeled using MatLab/Simulink. The nonlinearity of the governing system caused by dead time, limit, delay and nonlinear functions and the convenience of simulation were both considered in the modelling. In particular, for the prime mover, the model of power system analysis software package (PSASP) and the user-defined model were established respectively. The model parameters were measured and identified. The model of PSASP and the user-defined model were comparatively analyzed and the results showed that the user-defined model parameters could better reflect the dynamic response characteristics of the test unit. The research finding provides references for the improvement and development of power system stability calculation for hydropower units.
关键词
水轮机调节系统 /
执行机构 /
参数实测 /
建模 /
非线性 /
电力系统稳定计算
Key words
turbine governing system /
actuator /
parameter testing /
modeling /
nonlinear characteristic /
stability calculation for power system
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