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《长沙理工大学》 2017年
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Study of the Control Strategies of Grid Connected Synchronverters

MUGISHA Ange  
【摘要】:The increase of energy consumption increases the demand of renewable energy such as wind power,solar power,wave and tidal power,and more grid-connected systems are used.The conversion of the DC power produced by renewable energy to AC power and its transport to the power grid has become a topic of great importance.In order to let the converter reflect synchronous generator characteristics to the power grid,and implement renewable energy connecting to the power grid friendly,this thesis does some researches on the control of converter based on the model of synchronous generator.Firstly,a mathematical model of synchronous generator is built,with its electrical and mechanical parts.The synchronverters modeling is studied which includes the mathematical model of a synchronous machine and behaves in the same way,mathematically,as a synchronous generator to provide a voltage supply.Renewable energy sources are uncontrollable and highly non-linear.That's why it is often cited as an obstacle for the grid integration.Different control systems,with an open-loop control system or with a closed-loop control system used to interface renewable energy sources with utility grid to improve the efficiency,reliability and power quality of the system are discussed.Secondly,the converter control method based on model of synchronous generator have been done.The controller design and its parameters are analyzed in detail.The control part of the synchronverters consists of two control channels:one for the real power and the other for the reactive power.Its controller is in principle a power controller with integrated capability of voltage and frequency regulation so it is able to achieve real power control,reactive power control,frequency regulation,and voltage regulation.Simulations of a grid connected inverter have been done in Matlab8.3.532/Simulink/SimpowerSystems.The simulations results show that the converter control method based on model of synchronous generator can control the frequency and the output voltage amplitude of the converter.The synchronverter tracked the grid frequency very well.Moreover,the real power and the reactive power tracked their references quickly and accurately under different operational conditions.In this same part of the thesis,a grid-connected inverters PID-Fuzzy logic hybrid controller has been studied and analyzed.The proposed intelligent PID-Fuzzy logic controller automatically varies the PID coefficients and whenever the load and reference power changes the corresponding value of these PID parameters also changes.After simulations done in Matlab8.3.532/Simulink/SimpowerSystems,it can be seen that the performance of this hybrid controller is better,since the fluctuations in the steady state are considerably minimal.However,the fuzzy logic-PID hybrid controller fails to respond to a system with rapid dynamic response.In addition,an intelligent controller normally requires a complex control algorithm and many parameters require tuning.Such requirements present major difficulties in designing the entire system.Finally,this thesis introduces the structure of synchronverters in parallel operation and further researches on their control.The principle of parallel operation is that the inverter output voltage and the grid voltage should have the same amplitude with a phase angle difference.Simulations of a system that consists of two three-phase inverters powered by two separate 400 V DC voltage suppliers have been done in Matlab8.3.532/Simulink/SimpowerSystems.It can been seen that the parallel operation of two inverters performed very well.The currents are nearly sinusoidal.The output voltage is very close to the rated voltage.The real power and reactive power are well shared.Matlab simulations of a master slave mode with a linear load have been done.The proposed control scheme was applied for Inverter 1 as the master mode.Inverter 2 is a synchronverter which means that Inverter 2 can track the master phase by a synchronization unit and can also set the real power and reactive power references.It can be seen that the real power and reactive power were accurately shared,and P2 tracked the reference power very well.The output voltage is stable and purely sinusoidal,even when the state of the inverters changed.The solver used in tue simulations was ode45 with a relative tolerance of 10-3 and the sampling time was 10 μs.
【学位授予单位】:长沙理工大学
【学位级别】:硕士
【学位授予年份】:2017
【分类号】:TM46

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