Abstract
This paper proposes a hybrid control strategy of single-phase inverter, and it makes combination the fuzzy control technology and instantaneous feedback control technology of the current, and it solves the problem of load uncertainty and load model is difficult to established. Through ant colony optimization algorithm the problem that control parameters to solve the problem of the fuzzy control are depended on expert experience is solved. And on the basis of fuzzy voltage outer, the loop current inner loop is added, and through using current loop, it can effectively restrain the load disturbance, current limiting step in the current inner ring at the same time, thus it solve the inverter power supply for impact load adaptability. It not only can make the inverter power supply system output high quality steady-state voltage waveform, but also it can get fast dynamic response. Finally under the environment of Matlab simulation, the simulation results are demonstrated, the feasibility and effectiveness of the proposed compound control strategy are also verfied.
Highlights
The traditional control theory, such as digital PID control, non-beat control, state feedback control and repetitive control, sliding mode variable structure control, because they both depend on the precise mathematical model of the system for some certainty load has a good control effect, but as for the uncertain or strongly nonlinear load, impact load, the control effect is not ideal, and has relatively poor adaptability and flexibility, it is difficult to achieve the expected control effect
Ant colony optimization algorithm optimization quantification, the scaling factor based on ant colony algorithm which is introduced in front of the steps, in the Matlab platform we edit the ant colony optimization, do optimization automatically after setting the initial value
Fuzzy control does not need accurate mathematical model of the controlled object, but it is based on its rich experience of expert and can make well control of nonlinear system, which can solve the problem that the load is uncertainty and load model are difficult to be established
Summary
The presence of the nonlinear load and the uncertainties of load change lead to uncertainty the running parameters and variables in inverter power supply, it is difficult to establish accurate mathematical model of the control process of the system, and it has brought a lot of technical difficulties. Outer ring uses normal voltage controller, inner ring uses current hysteresis control mode for filter capacitance, it use the quickness of hysteresis control and strong anti-interference ability to improve the characteristics of output voltage of the system It can only limit capacitive current size, it can not control the load current and inductor current, such as the inverter output end of the overload current flows through the filter inductor caused by load or other reasons, and as for overcurrent protection of inverter power supply equipment, it is effective only by limiting the output filtering inductance current. In this paper it puts forward that it will combine the fuzzy control based on ant colony optimization with the inductance current instantaneous feedback technology, namely the compound control strategy, so that it can make the inverter power to get the ideal steady state, dynamic performance and good load adaptability
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