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In this paper, a three loop control strategy (TLCS) based on decoupled zero voltage switching angle (ZVSA) loop is proposed for a series-series (SS) compensated wireless power transmission (WPT) system. To realize constant current charging for EVs and ZVS operation of primary inverter, variable frequency and phase shift control strategy (VF-PSC) is adopted. However, the control variables that are...
The virtual synchronous generator (VSG) is a control scheme applied to the grid-tied inverter to increase system inertia by imitating the rotor inertia of synchronous generator (SG). However, due to the imitation on rotor inertia VSG control may lead to the power and frequency oscillation after a change or disturbance, which decreases the reliability of inverters. In this paper, the process of active...
Inverters in voltage control mode including droop control and virtual synchronous generator (VSG) are promising for interconnecting the renewable energy to the grid, which are both emulating the frequency and voltage regulating functions of synchronous generators through droop method. However, improper transient impact current and reactive power output are observed for inverters in voltage control...
Compared with traditional plug-in charging method, wireless power transmission (WPT) is recognized as a more convenient and safer means for electric power transfer. To enhance efficiency of the whole system and reduce EMI, zero-voltage switching (ZVS) of primary inverter should be achieved, while maintaining constant current charging for battery. Consequently, the phase of primary resonant current...
A novel practical virtual synchronous generator control strategy considering the differences between inverters and real synchronous generators is proposed in this paper. The proposed control strategy improves the emulation method of damping power in swing equation, which does not need a PLL and in the meanwhile eliminates the effect on the droop coefficient caused by the traditional constant damping...
In this paper, a control method named hybrid dynamic capacitor is proposed to provide dynamic VAR compensation and suppress resonance between power capacitor and system inductance in power distribution network. This paper explains the theory of hybrid dynamic capacitor and this method benefits by reducing the initial cost, switching loss and less harmonic current. Finally, simulation and experiment...
In order to increase the reliability and efficiency of Shunt Active Power Filter (SAPF), this paper proposes a novel fault-tolerant topology which can reconfigure the inverter circuit in fault condition. Redundancy operation is achieved by connecting the endpoint of fault phase to the midpoint of DC-bus. On this basis, working principle of fault-tolerant SAPF is analyzed and a control strategy which...
In high power PWM inverters, the stability of the auxiliary power supplies makes great contribution to the reliability of the inverters. This paper deals with the EMI (Electromagnetic Interference) problem of the auxiliary power supplies which is caused by the high-frequency switching power electronic devices. Firstly the high-frequency models of the three phase inverter and the auxiliary power supplies...
Distribution STATic synchronous COMpensator (DSTATCOM) has been proved an effective approach to compensate reactive and harmonic current in distribution network. However, DC-link voltages of H-bridge cascaded DSTATCOM contain 100Hz (double grid frequency) voltage harmonics due to reactive compensation current, these harmonics will also exist in the output of DC-link voltage balancing controller which...
Cascaded H-bridge (CHB) multilevel inverter has gained more and more focus due to its adaptability to high-power, high-voltage applications and capability of fault tolerant. In this paper, modeling of the CHB multilevel inverter under RMS feedback control is presented. This particular control scheme is suitable for the control system that has a strong demand for the output voltage amplitude accuracy...
The main goal of this paper is to perform a comparative study of different space vector pulse width modulation (SVPWM) techniques for dual three-phase permanent-magnet synchronous motor (DTP-PMSM) drives. Simulation results are provided to emphasize the advantages and disadvantages of each method. Experimental tests have been carried out to validate the most promising strategy which gives satisfactory...
For 4 wire VSI, Under unbalanced grid voltage conditions, neutral currents that flow through the fourth wire will distort the symmetrical output voltage. And DC link voltage ripple will be produced. We introduced a three reference frame scheme to eliminate the DC link voltage ripple and output voltage distortion. Unbalanced grid voltage and AC link current are decomposed into positive, negative and...
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