Electrical Load Simulator

As the development of the power electronic technology, the power electronic devices are applied in more and more areas. When design these devices, all kinds of condition should be considered before it is applied. So some kind of special load should be carried up to simulate the special condition. Especially in the lab, some very special loads, such as loads with harmonic waves and some non-linear loads, are needed. Recently, as the development of the electric circuit theory and the application of the integrate circuit, the source loads are required in more and more conditions, which are some kinds of load can also work as a source. The instance mentioned above requires some special loads to simulate the special conditions which no traditional loads can do. So in this thesis, we develop an electronic load to simulate every condition the devices may come up with in the application.The electronic load mentioned in the thesis is composed with two main modules. One is the signal module to calculate the current signal. The other one is the power modules to track the signal bring up by the first one. In this thesis, based on the analysis of these two modules, the writer finished the design of the power module. The power module consist of three parts: the current signal tracking part, the power returning part and the high frequency isolation part. The current signal tracking part connects with the experiment source. Thank to the hysteresis current control, it can track the current signal swiftly and exactly, which can simulate different kinds of the load. The power returning module connected with the power system, returning the power got by the device or supply to the device with power if it is needed. By using the technology of the PLL and hysteresis current control, it can make sure the device can work with its factor maintaining 1. The high frequency isolation part can isolate the experiment source from the power system, to keep its safety. Considering of the size and the waste, here the thesis adopts the high frequency way to design this part, which can considered as an isolated bi-directional DC converter, for the both side of it connect with the DC voltage.During the design of the device some technology has been adopted, such as the...