分轴燃气轮机甩负荷试验的分析与仿真研究

Analysis and Simulation Study of the Load-rejection Test of a Split-shaft Gas Turbine

以某分轴燃气轮机发电机组为原型,采用多回路反馈PI调节控制及压气机中间级放气技术,对机组甩负荷情况下燃机的动态特性进行分析。同时,根据容积惯性法,建立燃气轮机的模块化非线性数学模型,然后依据已建立的数学模型,利用MATLAB/SIMULINK平台构建燃机动态性能仿真模型。试验结果表明:该分轴燃机具有突甩80%额定负荷的能力,其中负荷幅度低于20%时,调节品质较理想。仿真模型能够正确反映大扰动条件下的燃机动态特性,满足动态仿真的精确性、实时性要求。

With a split-shaft gas turbine generator unit serving as the prototype,the dynamic characteristics of the gas turbine were analyzed by using the multi-loop feedback PI control and compressor inter-stage air bleeding technology under the condition of the unit being forced to shed its load. In the meantime,according to the volume and inertia method,a nonlinear mathematic model for gas turbines was established and then in accordance with the model thus established,a model for simulating the dynamic performance of a gas turbine was built by making use of a Matlab / simulink platform. The test and simulation results show that the above-mentioned split-shaft gas turbine has an ability to suddenly reject 80% of its rated load. Among them,when the load of the gas turbine is 20%,its control quality is relatively ideal. The simulation model can correctly reflect the dynamic characteristics of the gas turbine under the condition of the gas turbine subjected to a big disturbance,thus meeting the precision and real-time requirements fordynamic simulation