Research On Model And Parameter Identification Of The Turbine DEH System

Through establishing the model of the turbine DEH system and identifying its parameters, we can predict the performance of DEH system and monitor the operational state and the changes of Unit, thus providing accurate computing data for system stability analysis and daily production scheduling grid, ensuring the safe operation of the power grid and improving labor productivity. Therefore the establishment of the model of DEH system and the identification of its parameters has important significance.Firstly, the thesis studies the dynamic characteristics and its mathematical model of the turbine DEH system; analyzes the digital electro-hydraulic control system- DEH control system; models the turbine DEH system.Secondly, the thesis designs a reasonable program of field parameters test trials: thermal configuration test; static control system test, including parameters checking test of PID control link and the movement speed test of the tone; dynamic test, including the disturbance test of valve opening, the characteristics test of slope response test and the dynamic disturbances test.Then, the thesis establishes the DEH system in Matlab / Simulink simulation environment; obtains a model and parameters of the turbine DEH system through identifying with the test data. This chapter identifies the turbine DEH system parameters using Matlab function curve fitting with Least-squares method; obtains parameter test results of the turbine DEH system; provides an accurate calculation basis for power system stability analysis.Finally, the thesis verifies the accuracy of the Turbine DEH system model and parameters under PSASP power system simulation software environment. On the basis of the test results, this chapter obtains the model parameters of the Turbine DEH system for BPA and PSASP stable calculation; verifies the accuracy of the model parameters of the Turbine DEH system.The thesis applies the theoretical parameter identification to field trials such as the Guodian Kangping Power Company Limited Unit 1#. The thesis describes the parameters tests of the Unit 3 # Turbine DEH system; gives the turbine DEH system model and parameters for power system stability calculation of the Guodian Kangping Power Company Limited Unit 1#.In the end, the thesis summarizes the content of the subject; points the shortcomings of this paper; proposes an improved direction.