Research Of Parallel Operation Control Techniques Of The Communication Modular Inverter System

Based on an overall and detailed analysis of developing tendency, systematical discussion to the feature of inverter and requirement for the modular communication inverter power system, this dissertation focuses on the research of synchronization control and load-sharing control of the communication modular inverter system in parallel operation. The realization of the techniques for the power system, which includes the parallel system model, control techniques, the parallel redundant techniques, synchronization techniques, load-sharing techniques, is also proposed.A set of effective mathematical models and analyzing methods on inverters parallel system are developed on the base of deeply understanding about parallel principle of inverters, also the mathematical models, circulating current, characteristics of inverters out put power, characteristics of closed loop voltage, based on which we adopt the parallel control techniques and firstly mentioned the control techniques based on the combination method of priority and contest, which establishes the case of the real system, also discussed the redundant structure and skill implement N+l redundant structure on the BUS and unconflicted protocol.Based on the analyzing synchronization modulate and synchronism modulate, for the defects of synchronism modulate, uses prefabricating SPWM waves table, soft open loop synchronization model, exactitude modify and coarse modify, implements phase locking and synchronization accuracy.This dissertation researches and designs the model of load-sharing feedback control, feedback controller, detecting filter and character tics of closed loop control after discussing parallel drooped control. The method of combination of feedback control and drooped control is given for the first time, which implements the load-sharing better.For engineering practical project application and detailed requirements for power supply, this dissertation systematically analyzed the control technique and engineering design method for the modular communication inverter power system. Innegligible influence by factors such as nonlinear and instability of system are taken to careful consideration in theoretical analysis, combined with experimental research.Based on above work, we comprehend more deeply on the control of parallel inverter system. Independent, full digital and unbalanced load control techniques are the future orientation.