Research On Generator-side Control Algorithm Of Direct-driven Permanent Magnet Synchronous Wind Generator System

Renewable energy is more and more concerned by the whole world with drainof fossil fuels such as petroleum, coal, natural gas. In recent years, wind power hasbeen rapid development in the world as a safe, reliable and non-polluting renewableenergy, especially the direct drive permanent magnet wind power system is moreand more concerned. The main content of the paper is about the control algorithmand wind turbine simulation of the direct drive permanent magnet wind powergenerator side.First, this paper introduces the status of wind power at home and abroad and itsfuture development trend. And then it describes the current situation of wind powergeneration system about converter. This paper chooses the back-to-back PWMconverter topology combined with the analysis of the converter topologies andcontrol methods. Otherwise, the research status of the observer and wind turbinesimulation are analyzed.Second, passivity theories is analyzed from the energy shaping perspective.And the whole design of the passive and dissipative system, feedbackinterconnection and energy shaping are described. Introduce the concept of energydissipation to the Port-controlled Hamiltonian system giving birth to Euler-Lagrange equation. Port-controlled Dissipative Hamiltonian (PCHD) can beobtained. The permanent magnet wind power generation PCHD model system isestablished combined the PCHD system with permanent magnet wind powergeneration system. To complete the maximum power point tracking (MPPT) control,the PCHD theory combines with non-singular terminal sliding mode (NTSM). Anew double loop speed control of direct-driven permanent magnet synchronouswind generator is proposed and compares with conventional PI control. The resultindicates that the proposed control strategy makes the system faster response,robustness and better anti-interference ability. The maximum power point trackingcontrol is achieved.Third, in generator side control, the wrong speed and phase information iscollected because of optical encoder in the strong electrical interference ormalfunction. A non-singular order termina l sliding mode observer is proposed toinhibit the chattering problem produced by the traditional sliding mode observer.The control strategy has a strong robustness to the motor parameters perturbation.Adaptive law is used to estimate the motor speed, makes the speed steady-stateestimate smoother and improved the system robustness.Finally, a wind turbine simulation platform is build based on the DC motor. In the torque control program, a doubled closed loop speed experiment and windturbine simulation experiment are completed. The experiment result shows that thewind turbine simulation based on the DC motor is as good as expected.