Gong You-min

Realization of matrix electric power conversion with practicality

A realization of three phase to three phase matrix electric power converter (33MC) with practicality is depicted, which is characteristic of modular configuration, simple and safe semi-natural semi-forced two-step commutation strategy, general over-current protection circuit, flexible generalized switching functions, combined bilateral power switches, and so on. A new approach to manufacturing-oriented 33MC comes forth, which is composed of 3 modular three phase to single phase non-square matrix electric power converters (31MC).

High dynamic performance speed control strategy of high density IPMSM for HEV application

This paper presented a novel, practical high performance control scheme of interior permanent magnet synchronous motor (IPMSM) for Hybrid Electric Vehicle ( HEV) application. The control scheme improves the speed dynamic consistency in full range operation by adding torque loop in the speed control system. It adopts zero space vector time T0 feedback instead of full voltage feedback to generate an adequate flux-weakening (FW) current. It simplifies the nonlinear computation of the full voltage reference and can adapt the change of DC bus voltage fed by fuel cell automatically. It is convenient to select torque control mode or speed control mode. It can be easily implemented in software without additional hardware or sensor needed. The simulation and partial experimental results show the good feasibility and performance of the proposed control scheme.

Simulation and experiment of three-phase controlled rectifier employing matrix converter theory

Based on topology and switching function matrix of three-phase to three-phase matrix converter, topology and switching function of a three-phase controlled rectifier is established, including three cases of the maximum voltage transfer ratio 1/2, /spl radic/3/3 and /spl radic/3/2. Its basic conversion performances are implemented after analysis in theory and by simulation. It is shown by obtained results that it has good features such as variable output voltage amplitude, input current zero displacement and bi-directional power flow. One-step commutation strategy, namely modified four-step is also employed, which can reduce commutation time and commutation effects on converter performance.

Unified algorithm of single-phase active AC-DC converters and its applications

This paper discusses a novel boost single-phase active AC-DC converters, named low-end semi-controlled bridge AC-DC converter. By analysis, its topology and principle can be derived from the conventional single-phase power factor corrector (PFC). But it has also some differences, such as power device positions, inductor type, input voltage waveform detection and induction current detection, so its design is also different. The converter is implemented by employing two current detection approaches, i.e., current transformer detection and shunt resistor detection. Consequently, it can provide a steady DC output voltage with a low voltage ripple, approximately unitary input power factor and 2.5 kW output power. The experimental results show validity of the theoretical analysis.

Analyzing and Seeking Minimum Test Instruction Set of Digital Signal Processor for Motor Control

The relativity of instructions of motor control digital signal processor (MCDSP) in the design is analyzed. A method for obtaining a minimum instruction set in place of the complete instruction set during generation of testing procedures is given in terms of the processor presentation matrix between micro-operators and instructions of MCDSP.

A novel topology of hybrid multilevel inverter with minimum number of separated DC sources

Multilevel inverter has become increasingly popular in recent years due to advantages of high power quality waveforms, low switching losses, and high-voltage capability. A novel multilevel inverter with minimum number of separated DC sources is presented in this paper. Three-phase output voltages of this inverter can easily be balanced because they are synthesized by using the same DC sources. A harmonic reduction method eliminating both the 5th and 7th harmonics is proposed. Finally, comparison results and spectral analysis are presented.

Analysis of capacitive parasitism in PWM inverter-fed motor

The effects of parasitic capacitance in induction motor system are unnoticed when it is fed from the AC line, but they are obvious when supplied directly from a PWM inverter. Consequently, many parasitic problems occur, such as motor-to-earth leakage current, bearing current, incoming line current distortion and uneven distribution of electrical stresses along the winding. On the basis of the uniform transmission line principle, a complete equivalent circuit of the PWM inverter-fed motor system is presented, based on which all the capacitive parasitic problems mentioned above are analyzed and simulated by means of PSPICE. All the results are consistent with the existing ones.

Study on Rotor IGBT Chopper Control for Induction Motor Drive

Rotor chopper control is a simple and effective drive method for induction motor. This paper presents a novel IGBT chopper topology, which can both adjust rotor resistance and protect IGBT efficiently. Investigation on the quasi-transient state of the rotor rectifying circuit is made, and a nonlinear mapping between the equivalent resistance and the duty cycle is deduced. Furthermore, the method for determining the magnitude of the external resistor is introduced.

ANN-Based Identification of Steady-State Behavior Parameters of Composite Power Semiconductor Device Model

The paper describes the application of an ANN-based approach to the identification of the parameters relevant to the steady-state behavior of composite power electronic device models of circuit simulation software. The identification of model parameters of IGBT in PSPICE using BP neural network is illustrated.