Research On The Control Strategy In The Inverter Of The Energy Feedback Electronic Load

All kinds of power source has been applied to every field of the life with the development of society and economy, they must have aging power source burn in test,output character test, electromagnetic compatibility test etc before leaving the factory.Traditional testing methods usually use the static load of resistance, inductance,capacitance and combined load, their shortcomings are: parameter modification is not convenient; affected by the environmental factors easily, and the low precision; power consumed, resulting in energy waste. Electronic load overcomes the defects which exist in the traditional load. Power electronic devices achieve the control of voltage and current, so as to realize the load characteristic simulation. And inverter let energy back to the grid ultimately which output by power source, achieve energy recycling.In order to solve the problem that bus voltage fluctuation leads to the grid current distortion existing in the single-phase energy feedback electronic load of double PWM topology structure. A Current loop design method was proposed,which is “BP regulator combined with disturbance observer feed-forward compensation based on LODFC”. It is an ideal for electronic load control strategies and network side. The main contents of the thesis are as follows:1) The electronic load research background and significance was introduced, on the other hand, an overview of research progress of electronic load related technologies was provided.2) The main circuit topology and working principle of the single-phase energy feedback electronic load are briefly introduced. The control strategy of electronic load inverter side and part hardware of the control system are given.3) A control strategy of “BP regulator combined with disturbance observer feed-forward compensation based on LODFC” was proposed after introducing the advantages and disadvantages of BP regulator and linear control method of nonlinear systems. The principlein and method of disturbance observer feedforward compensation are analysed in detail. Moreover, giving the design process of disturbance observer and voltage outer.4) The digital control system based on ARM is designed. Including the design of the disturbance observer,BP regulator and voltage regulator’s discretization. At the same time, the software structure and the design parameters of Control Systems are given5) Simulink and experimental results for the main conclusions were verified at the end. The simulation and experimental results are consistent with the theoretical analysis.