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This paper addresses the compensation performance of the previously proposed reactive power control algorithm with the constant dc-capacitor voltage control for active load balancer (ALB) on three-phase four-wire distribution feeders under distorted source voltage conditions. The instantaneous power flows into the ALB is discussed in detail. This instantaneous power flows into the ALB show that the...
The capability of black start (BS) is vital for microgrid, which can reduce the interruption time and the economic loss brought by outage. This paper presents a black start strategy for the microgrid with PV and hybrid energy storage systems, based on a serial restoration strategy. The primary reference source with black start capability runs V/f control mode to establish pre-specified voltage and...
The control strategy of DC-link voltage is one of the key techniques of shunt active power filter (SAPF). The DC-link voltage has an effect on reactive power compensation ability and power loss of SAPF. Based on the relationship between real-time load reactive power and DC-link voltage, an optimal DC-link voltage control strategy is proposed in the paper. The optimal DC-link voltage will maintain...
A new unity power factor control strategy for electrically excited synchronous motor(ESM) based inertia wheel energy storage system by high power back-to-back converter is proposed. In EMS control system, there are three objects from the control consideration, i.e. the stator flux, the power factor, and the DC-link voltage. In this paper, we compute only in rotor-oriented reference frame. Field operation...
This paper presents the sensorless control method that employs the adaptive back-EMF(Electromotive Force) and current model observer(CMO) of interior permanent magnet synchronous motor(IPMSM) with improved instantaneous reactive power compensator(IRP). The estimated back EMF considering a saliency is obtained by using the adaptive control method. The estimated EMF is inputted to the CMO for estimating...
A passivity-based power control method is proposed for the three-phase three-level NPC rectifier in this paper. The decoupled control of active and reactive power of the three-level NPC rectifier in the dq reference frame can be realized by the proposed method. The neutral point voltage is controlled by adjusting the dwelling time of the small vectors. The proposed modeling and control strategy are...
Multiple-motor drive system is usually adopted in electric vehicles, high speed rail and some industry applications, such as textile, steel and paper making. In order to save cost and simplify structure, a dual permanent magnet synchronous motors (D-PMSMs) drive system fed by a five-leg inverter is investigated in this paper. Based on the space vector pulse width modulation (SVPWM) method, unity power...
This paper address compensation performance for the previously proposed smart charger of Electric Vehicles (EVs) with constant dc-capacitor voltage control under multiple household customers. No calculation blocks of the reactive and unbalanced active components on the load side are used in the previously proposed control strategy. The smart charger with the constant dc-capacitor voltage control based...
This paper compares the performances of Voltage Oriented Control (VOC) and Direct Power Control (DPC) with hysteresis loop in three-phase voltage source rectifier (VSR), which can be applied to the front-end rectifier in state of art 380V DC distribution system for green data center. Both systems achieve high power factor, low input current distortion and high efficiency. And the simulation results...
This paper proposes a novel and simple reactive power control strategy and source-side current balancing for photovoltaic (PV) power conditioning system (PCS) to suppress the voltage rise at the point of common coupling (PCC) on single-phase three-wire distribution feeders. The proposed reactive power control and load current balancing use only a constant dc-capacitor voltage control, which is commonly...
A Surface Permanent Magnet-type Linear Vernier Motor (SPM-LVM) is developed, and its output characteristics are clarified by calculation in this paper. As a result, a high thrust, high power factor and high efficiency SPM-LVM with a maximum thrust of 1509N, power factor at 970N of 100.0%, and efficiency at 970N of 90.5% is obtained under the conditions that the operating voltage, frequency and synchronous...
This paper presents performance evaluation of three-phase induction generator operating as a grid connected single phase induction generator using electronic capacitor for variable speed wind energy applications. When the existing delta connected three-phase can operate as a single-phase induction generator by voltage control techniques using electronic capacitor. The proposed converter system for...
The droop control strategy of an AC microgrid in islanding mode is presented in this paper. The frequency reference of islanding mode is recalculated from proposed droop control technique due to the loss of grid reference frequency. The fast response of both voltage and frequency of the AC microgrid during an islanding operation is required in order to maintain the frequency and voltage stability...
This paper presents a single-phase grid-connected PV system supplying nonlinear load which controls active power and harmonic compensation. The control method employs calculated reference current derived from a combination between the active current and the compensated harmonic current. The active current for controlling transferred power from solar panels to the grid system is obtained from MPPT...
A novel topology of induction machine with a rotor integrated converter with a floating capacitor is investigated in this paper. The stator windings of the induction machine are directly connected to the grid. While the rotor windings are connected to a converter with a floating capacitor. The steady state mathematical model is presented and used to predict the operating range of the induction machine...
The low voltage ride through (LVRT) capability of DFIG has caused more concern. And for testing requirements of LVRT for DFIG WT, this paper propose control strategies for LVRT of DFIG WTs by injecting reactive power into grid. Reactive power allocation are decided by voltage sag levels. When grid voltage drop to 30%, grid-side converter (GSC) works as a STATCOM. Their maximum limited reactive current...
Permanent magnet synchronous generator (PMSG) is attractive as a power source for mobility due to its high power density and low maintenance needed. However, increase of the generator current results in the voltage drop due to the synchronous reactance. That means the generator capability including rated voltage cannot be sufficiently used in whole operating range without reactive power control. This...
A certain 5th and 7th harmonic voltage in the grid is allowed, which will result in 6 times output power ripple of the grid-connected inverter based on the traditional vector control. In order to enhance adaptive ability for grid-connected inverter, a direct power ripple rejection strategy based on resonant controller is proposed in this paper to achieve smooth output active power and reactive power...
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