Research And Design Of Integrated Compensation System For Single-phase Shunt Active Power Filter

Due to the diversified development of power supply system and power load,the power quality problems become more and more complex.As a result,the existing technology of shunt active power filter is widely used in power control equipment,which can not be applied to the changeable power environment.Therefore,the research and analysis of single-phase SAPF is carried out in this thesis.The harmonic suppression and reactive power compensation under the new power quality problem are described from four aspects: main circuit parameter selection,harmonic detection algorithm,current control method and experimental design process.The selection and optimization of SAPF main circuit parameters directly affect the stability,dynamic response performance and compensation accuracy of the whole system.However,there is a certain coupling relationship among the main circuit parameters,which has a great impact on the reasonable selection of each parameter value.From the perspective of coupling relationship,this thesis analyzes the calculation methods of the AC side main circuit and the DC side voltage and capacitance values of the single-phase SAPF main circuit,and obtains the analytical expression of the specific single-phase SAPF circuit parameters.The optimal design of the coupling relationship among the variables of the obtained expressions is obtained,and a new parameter design scheme that can be applied to the compensation requirements under all working conditions of the compensation system is obtained.The accurate detection of harmonic and reactive power components is the premise to ensure the good compensation effect of the whole system,and the extraction of fundamental voltage synchronization signal is the premise of harmonic and reactive power detection algorithm.In this thesis,the five most common power supply voltage distortion in the current power system are analyzed,four different detection methods are compared and studied,and then a new method is obtained,which is not affected by the power supply voltage distortion and has high detection accuracy.Aiming at the control method in SAPF compensation system,this thesis introduces the DC side voltage control method,instruction current generation method and converter output current tracking control method respectively,and deeply studies two different instruction current generation methods.On the basis of considering the stability of the system and the compensation effect,a new method to detect the current control mode of the power supply is presented.Finally,based on the above analysis and research,a system simulation model is established in MATLAB software using model-based design.The method directly builds the MATLAB model and automatically generates code for debugging,which avoids a series of complicated processes that need to write C code in the traditional experimental system,which greatly facilitates the development progress and experimental efficiency.The final experimental results prove the correctness and feasibility of the design adopted in the thesis.