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The advance in energy storage technologies allows to improve significantly the performances of electrified light transportation systems. This is aligned with the massive requirement of competitiveness compared to other transportation technologies in terms of sustainable energy and high reduction of environmental impact. The installation of stationary storage devices, as widely recognized, allows the...
In the double closed loops control strategy of three-phase voltage source PWM rectifier in the synchronous reference frame, the linear PI control is usually adopted in the voltage control loop, which cannot reflect the nonlinear nature of the PWM rectifier, and restricts the systempsilas control performance. According to the analyses on the voltage equation of the PWM rectifier, a voltage control...
A novel hybrid control based on digital variable-band hysteresis discrete pulse modulation (DPM) control and repetitive control is proposed for a 400 Hz inverter. The good dynamic response of the DPM inverter is obtained by the digital hysteresis control, and the steady state control performance is improved significantly by the repetitive control. By utilizing the variable hysteresis band, the stability...
In order to improve the performance of three phase voltage source PWM rectifiers, this paper presents a passivity-based control (PBC) strategy based on port-controlled Hamiltonian with dissipation (PCHD) model established from the rectifierspsila power circuit. With the model, a passivity-based controller for PWM rectifiers is designed by using Inter-connection and Damping Assignment passivity-based...
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...
In this paper a predictive control scheme is proposed for the VSC-HVDC system to achieve decoupled control of active and reactive power. The proposed control scheme, which is of simple structure, offers high tracking accuracy, fast dynamic response and good robustness. A case of two-terminal three-level VSC-HVDC system is developed in MATLAB/SIMULINK to verify the validity of the proposed control...
An electrical balance of plant(E-BOP) of a 600 kW molten carbonate fuel cell (MCFC) has to transit from grid-connected(GC) mode to grid-independent(GI) mode when a grid is in a fault conditions. A minimum transition time is limited by four cycle for a 600 kW MCFC to ride through a grid fault. In this paper, we propose a control algorithm of a 600 kW E-BOP for a MCFC system. The E-BOP has three operation...
Using the state-space average modeling method, a nonlinear affine model of Boost converter working on current conduction mode (CCM) is set up. Based on the input-output linearization method of differential geometry theory, the internal dynamics of the systems, with output represented by the input inductor current and the capacitor voltage respectively, are been studied. It is pointed out that the...
Voltage source converter (VSC) is sensitive to the AC unbalanced input voltages under traditional control strategy, and leads to 2nd order DC voltage fluctuation which will be spread from one station to the other through the DC cables. As a result, it appears to be 2nd order power fluctuation and power quality problems, or even leads to system instability. So it is necessary to carry out the research...
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...
This paper models the three-phase boost-type rectifier as switched linear systems (SLS) in the d-q reference frame which includes six available subsystems, so the problems of PFC and DC-bus voltage regulation are transformed to stabilizing the SLS. And then a novel control rule based on min-projection strategy is proposed, which controls the switching sequence around the six subsystems such that the...
This paper presents a nonlinear control strategy for unified power quality conditioner(UPQC) with better stability and dynamic performance in comparison with PI control and classical decoupled strategy. The analysis is based on the rotating reference frame, and the nonlinear property of UPQC mode is partly dealt through the exact linearization via feedback. The operation of control circuit has been...
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 first established a mathematical model for the split-capacitor three-phase active power filter. Based on the precise mathematical model, it then proposed a control strategy under dq0 coordinate for the DC voltage control of APF, to control the d axis current for DC total voltage stability, to control the q axis current for DC voltage balance. Finally, simulation and experiment result proved...
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).
Based on the coordinate transformation theory and principle of electromechanical energy conversion, it is demonstrated that the rotor field-oriented control decouples not only flux and torque but also transformer electromotive force (TEMF) and motion electromotive force (MEMF). The field-oriented control of induction motor can be achieved by control of rotor motion electromotive force. A universal...
Single phase neutral point clamped (NPC) converters are increasingly applied in high speed railway traction drive systems as they allow the use of lower voltage devices in higher voltage applications, provide reduced output voltage THD and can develop low common mode voltage. To solve the imbalance problem of neutral point voltage, dead-time effect for neutral point voltage is described in this paper...
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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