Research On The Inverter In The System Of The Renewable Energy To Be Fed Into The Utility Line

With the rapid development of society and industry nowadays, and the continuously increase of population; the requirement for energy becomes more and more large. But it is continuous exploitation of the traditional unrenewable resource such as coal, petroleum and so on that makes serious effect on the human's ecological environment. So it begins to think much of the problems about resource and environment protection all over the world, and the concept of "Green and Environmental Protection" was proposed. All of above make it has important realistic significance that rational using of the renewable resource. If the energy, that produced in the discharge experiment before the large load electrical products leaving factory, in the experiment for the testing of the power of the diesel engine, in the charge and discharge processes of the storage battery or by all kinds of new energy generation equipments, can be fed into the utility line efficiently, it can not only economizes energy, but also improves the environment and the economic benefit.How to deliver power to the utility line reliably and in high quality is an important problem. The inverter that can transform the electrical energy in the system of the renewable resource to be fed into the utility line is becoming one of the hot points in international research. Full-Bridge inverter operated in SPWM state is mostly used. It often need a controller which including SPWM pulse generator, synchronization, phase locking, low pass filter and so on. So it is somewhat sophisticated, and has lowreliability and high cost of hardware.A novel inverter in the system of the renewable resource to be fed into the utility line is presented in this paper. The voltage of the utility line is directly sampled as the reference of the tracking current. The reference and the tracking current are compared through the current tracking control circuit and it outputs PWM switching signals to drive the four high-power switches of the invert bridge respectively. The sinusoidal output current, that is also the current input to the utility line, is obtained from the inverter, and it has the same frequency and phase with the voltage of the utility line. Consequently, the inverter accomplishes the feedback of the renewable energy to the utility line in high power factor. The inverter has characteristics of simple configuration, fast responding speed, high power factor, easy control and so on, and many systems can be associated in parallel at the same time.Its operation principle and critical parameters are analyzed and discussed. At last, the computer simulation and experiment of the proposed project give the excellent proof to feasibility and validity.