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An ac voltage regulating system of doubly Salient Electro-magnetic Generator has been performed in this paper. In order to maintain the high voltage 360VDC stable, the dual boost converter with fixed frequency PWM controlled is adopted. Three-phase dual buck inverter was adopted to output 115VAC/400Hz. the generating system configuration, control strategy of dual boost converter and three-phase dual...
This paper proposes a new extended boost quasi Z-source inverter (ZSI) and a simple modulation and control method based on one-cycle control for controlling a grid connected PEM fuel cell energy system. ZSIs are gaining popularity. Similarly one-cycle controllers are becoming popular due to their simplicity, ease of implementation and fast response. However, this control method has not been developed...
By introducing the structure and principle of a novel arc suppression coil based on transformer with load controllable, the design of its control system is presented in this paper. The fundamental principle of the proposed arc suppression coil is that the equivalent reactance of transformerpsilas primary winding can be regulated by controlling the variable load of transformerpsilas secondary winding,...
With the primary and a secondary winding ports leading out, a multi-winding transformer with air-gapped core can be regarded as a linear two-port network. Adjust the current relationships between the ports, the input impedance of the primary winding can be a variable reactance; change the short-circuit conditions of other secondary windings, the reactance of primary winding will move in deferent intervals...
A novel semi-physical simulation platform for inverter is proposed. The driving circuit and SPWM bridge are replaced by a low power level circuits of operational amplifier and logic ICs, and DSP controller exactly the same with that for the real system. The semi-physical simulation platform can be used for system-level research, especially for control algorithm design, with equivalent inverter systempsilas...
In this paper, the different influences of three-limb and multi-limb transformer with Star-Star or Delta-Star connection, three-limb filter inductor, multi-limb filter inductor and position of the LC filter in a three-phase PWM inverter have been analyzed in detail in stationary dq0 frame. The analysis show that three-phase transformer with different limb numbers and connection types have different...
The multiple overlap mode of the overlap carrier wave phase shift PWM (SVPWM) inverter is one of the development directions of the super-high capacity inverter, this paper reasons the relation between carrier wave phase shift SVPWM circuit output voltage and phase shift angle, put forward the best phase shift angle formula, proposed two kinds of control schemes and compares them. Through the experiment...
Five-level inverter has been applied to industry and railway traction to solve the difficulty in applying low-voltage or medium-voltage switch devices to high-voltage system. The basic principle of diode-clamped five-level inverter is analysed in this paper. Based on the analysis of diode-clamped three-level inverter, single pulse control method, pulse width modulation(PWM) control methods and a novel...
For the mathematical model of PWM inverter under the d-q rotary coordinate system, there exists coupling between the active current and reactive current, which makes it difficult manipulating the power injected into AC grid from distributed generation system. So as to handle the problem, a novel current decoupling strategy based on the input-output linearization is employed in the paper and the PI...
Because of the unbalanced construction, the conventional three-phase three-leg inverters produce huge amount of common-mode (CM) voltage. This paper proposes a novel sinusoidal pulse width modulation (SPWM) control strategy based on three-phase four-leg structure. This strategy is an improved method on the basis of the SPWM carrier phase-shifting control technology. In the new method, the state of...
The paper analyzed the generating process of second-harmonic DC-link voltage and the influence of beat phenomenon on traction motor in the single-phase three-level converter-inverter traction system of high-speed EMUs. Based on the research of operation modes of traction inverter, the beat-less control technology was given, and different control strategies under multi-pulse modulation and single-pulse...
In synchronous rotating frame (SRF), the mathematical mode of a three-phase PWM VSI with LC filter is complex, and the dq components have cross coupling terms. In order to obtain good dynamic and static performance, the controller structure should be inherently based on the systempsilas mathematical model, which means that the decoupling control strategy with feed-forward should be adopted. But this...
According to the basic characteristics of air plasma cutting inverter, the cutting inverter with sliding mode control (SMC) is researched and designed. Unlike the traditional PI control with the contradictory between the small voltage overshoot and the fast response time, SMC has not only effectively solved the voltage overshoot during the cutting process, but also realized a faster voltage response...
Through analyzing the shortcomings of the control system on the traditional cutting inverter, this paper presents the double close loop control system based on pole assignment for cutting inverter, which based on phase shift full bridge zero voltage switched (PS-FB-ZVS). This paper builds the small signal mode of PS-FB-ZVS PWM converter, and assigns the double close loop PI parameters by pole assignment...
Based on the space vector pulse width modulation (SVPWM) principle, the detailed SVPWM algorithm is derived in this paper and some improvements have been made taking over modulation and sector transition into consideration. Then the improved algorithm is simulated under MATLAB/SIMULINK. Multiple modulating methods-continuous and discontinuous are achieved in the simulation by changing some particular...
This paper analyzed the neutral-point balancing problem of the neutral-point-clamped (NPC) three-level space voltage vector pulse-width modulation (SVPWM) inverter and the influence of each vector to the neutral-point voltage. Based on the normal control strategies to solve the neutral-point balancing problem, including the open-circuit passive control strategy, the hysteresis-band control strategy,...
In the paper, a novel principle of variable reactor with a transformer and inverter control is proposed. A transformer with air gap is chosen and its primary winding is connected in series or parallel in power utility, the primary winding current of the transformer is detected and functioned as the reference signal. A voltage source PWM inverter is applied to produce a voltage, which is a controlled...
This paper presents a design of a voltage controller of single-phase voltage source PWM inverter with LC filters. To compensate voltage distortion from non-linear loads, the resonant controller has been proposed. However, the design of the control system with the resonant controller is not clear. So we propose the design with the Coefficient Diagram Method (CDM).
A three-phase PWM bidirectional converter system based on line voltage oriented vector control is researched. A novel on line voltage oriented vector control without line voltage sensing is proposed. The system is operated with unit power factor in the side of AC line no matter in rectifier mode or active inverter mode. The alpha and beta components of line voltage were estimated by the line current,...
On the basis of analyzing three-level inverter direct torque control principle (DTC) , a new synthesizing vectors PWM method of three-level DTC is presented, which can not only effectively control neutral- point voltage, but also restrain higher dv / dt of output voltage and improve three-level DTC output performance ,reduce torque ripple. Through theory analysis and experiment research, the author...
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