Inverted pendulum system is a nonlinear, coupling, multi-variable and unstable system. Because the inverted pendulum system exists all kinds of disturbs inevitably, the states have errors and the accuracy of control drops. In this paper, quasi-sliding mode control is used to achieve optimal control. First, the state-space model of the system is created by force analysis. Then, in the design of the controller, we make use of the sliding mode control, which has the advantage of anti-interference. To reduce the chattering phenomenon, we utilize saturation function in the reaching low design. The simulation results show the effective of the method

Electro-mechanical hybrid power controller (EMHPC) is a kind of switch with a breaker as mechanical switch and an insulated gate bipolar transistor (IGBT) as solid-state switch. It is a key element of electrical load management center (ELMC) of the more electric aircraft (MEA). On the condition of high voltage (270VDC) and large current (200A), the proposed EMHPC in this paper features great simplicity and reliability. It has no contact chatter when the controller is turned on or off, main circuit will be shut down when contactor fault happens, it also has the feature of over-current protection for solid state switching device when large current occurs in the working circuit. The proposed controller is supported by experimental results.

This paper designs a novel single phase high power factor rectifier with IR1150 as its main control chip, which main circuit uses boost topology. The fundamental principle of the proposed rectifier is introduced. The IR1150 control IC based on one cycle control is intended for boost converters for power factor correction operating at a fixed frequency in continuous conduction mode (CCM). The use of the IC will make the PFC circuit design easily, the volume of the rectifier small and the efficiency enhancing. The modules of the proposed rectifier such as current loop and over-current protection, voltage loop and over-voltage protection, soft start, and so on, are analyzed and designed respectively in detail. Experimental results of the designed 600W prototype prove that the boost high power factor rectifier designed is rational and reliable, its power factor can reach 0.994.

According to the operating characteristics of the wind power flow optimization and control system, an improved supercapacitor euqivalent circuit model is proposed, which characterizes termimanl behavior of the supercapacitor in the time ranges from several seonds to several minutes as well as the influence of lekage current in hours range. By the method of circuit analysis, parameter identification of the model is deduced in detail. The smilation and expriment results indicate the model and its parameter idenfication method proposed in the paper are feasible and effective.

As the energy crisis and the pollution are serious, the exploitation of solar has received more and more attentions. It is well known that for a given solar radiation intensity and solar cell temperature there exists a maximum power point at which the power generated from the PV panel is at its maximum. In order to improve the efficiency of the system, the main method is to regulate the output of array to develop the maximum power point tracking (MPPT). In this paper the principle and control method of DC/DC conversion in grid-connected photovoltaic system are experimentally discussed. The conductance incremental method is analyzed in detail, and an improved variable step-size control method is implemented for MPPT with pulse width modulation. The experimental results prove the feasibility and correctness of the control method.