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This paper proposes a single-pulse operation control for Matrix converters where the single-pulse operation is controlled to synchronize with the output frequency. There are two known problems for the synchronize control; firstly, the beat-frequency components occurs in the output current, and secondly, the input power factor should be controlled as unity. To solve these problems, this paper proposes...
This paper presents a novel PWM strategy of single-phase to three-phase matrix converters with a small capacitor compensating for single-phase instantaneous electric power fluctuation. The output voltage and input current references of the small capacitor to obtain unity input power factor are derived. The PWM strategy with the only four commutations of all the three phases during a control period...
This paper explores different strategies to set the reference current of a STATCOM under unbalanced grid voltage conditions. The aim of the proposed control strategies is to provide a set of reactive current references to be injected by the STATCOM under unbalanced grid faults. Their performance, as well as their grid support capability will be evaluated by means of simulations. Finally, the experimental...
This paper proposes a new half-bridge inverter based active power quality compensator (APQC) for electrified railways with a three-leg inverter. The first-leg is connected to α-phase, and the second-leg is connected to β-phase. The midpoint of two capacitors on the dc side is connected to the ground line. These two half-bridge inverters exchange the active power on the each feeder each other through...
This paper presents an approach of sparse matrix converter (SMC) using Z-source network. The SMC is implemented by connecting a controllable rectifier and the traditional inverter through a Z-source network. The Z-source can produce any desired output voltage by controlling the shoot-through time. Compare to the traditional three-phase SMC, the three-phase Z-source SMC has the same number of switches,...
This paper describes the design of a digital control for PWM current source rectifiers (CSRs) in the range of 1 - 10MVA. A cascaded control structure is proposed: the inner loop controls the grid currents and the outer loop controls the dc-link current. The proposed grid-current control combines state feedback for active damping of the LC-filter with a servo compensator to increase robustness and...
New constant-voltage constant-current ac power supply is presented. Our original Variable Capacitance Device is utilized in the power stage as linear reactance device. This circuit theoretically makes no distortion of output voltage waveform and a high efficiency can be obtained. For output voltage/current control and input power-factor correction, two Variable Capacitance Devices were employed as...
The paper outlines the installation of a STATCOM for suppression of flicker generated by an electric arc furnace in a steel plant connected to a weak feeding grid. Salient design features of the STATCOM are given, and performance results from field measurements are presented and discussed.
Active front-end converters with bidirectional power flow capability have been extensively used for utility applications of power electronics, in which the hybrid type with coupling capacitor in series connection is receiving much attention due to its low operating voltage and low switching ripples. This paper proposes an improved control strategy for hybrid active front-end converters in grid-connected...
Single-phase quasi-Z-source AC-AC converter has a lower input current total harmonic distortion, higher input power factor and higher efficiency in comparison with the conventional single-phase Z-source AC-AC converter. This paper presents a safe-commutation strategy for the single-phase quasi-Z-source AC-AC converter. The converter only uses four switches without the use of a snubber circuit. The...
This paper proposes a novel single-phase to three-phase power converter, which based on current-fed topology. The proposed power converter doesn't require electrolytic capacitor and large inductance reactor. The proposed control method obtains high power factor operation and variable speed control for IPMSM. By using boost voltage characteristics of the proposed converter, the converter controls high...
In the Tokaido Shinkansen, the instantaneous feeding power of substations increases because of the high-density train schedule and the improved acceleration performance of the rolling stock. If the load power of feeding substations increases further, it will not be possible to maintain the feeder voltage if the power converter supplies only reactive power. Assuming such a situation in the frequency...
A novel digital phase-locked-loop (DPLL) method is proposed for single-phase grid-connected power generation systems in this paper. It consists of a grid voltage feed-forward network and a fictious instantaneous power feedback correction network. The fundamental signal of the grid voltage is extracted by a digital Butterworth filter to generate a unity sine reference signal for the feed-forward network,...
The proposed paper studies the transient operation of a grid connected power converter designed for microgrid applications. A control system consisting of an improved droop characteristic control using synchronous frame PI regulators including a feed-forward disturbance decoupling controller is developed and tested. The proposed control system can operate in two main operating modes: islanded and...
This paper discusses about characteristics of a matrix converter where a current feedback is applied to the input side. When the impedance of the power grid is high, such as a generator, the control stability of the matrix converter will be deteriorated. One of the solutions to this problem is to apply an input current stability control that is proposed. However, the efficiency of the generator will...
TMEIC has developed a large-capacity Power Conditioning System (PCS) for wind turbine generators. It has high energy density and reliability and is very compact. The PCS employs large-capacity IGBTs cooled by indirect water cooling and is snubber-less. In a run-back test, the PCS was inspected in real usage conditions, in terms of voltage, current (including harmonics), and power. The dynamic control...
In this paper, a delta-connected DSTATCOM with cascaded H-bridge multilevel inverter is proposed for real-time load power factor correction in power distribution systems. First, a feed forward compensation scheme is developed for the DSTATCOM for fast response requirement. Then, the DSTATCOM is built and simulated with Matlab/Simulink program. Accordingly, a hardware prototype is constructed by using...
In this paper, a novel current control technique is proposed to control both the active and reactive power of a single phase hybrid PV inverter connected to grid. The hybrid PV inverter not only maintains constant load voltage but also ensures active and reactive power flow from the grid with low THD even at the presence of non-linear load. A p-q theory based approach is used to find out the current...
The paper presents a single-stage high-power-factor electronic ballast for metal halide lamps. The proposed ballast integrates a buck-boost converter, a buck converter and a full-bridge inverter into a single power conversion circuit. The buck-boost converter served as a power-factor corrector (PFC) is designed to operate at discontinuous conduction mode (DCM) to achieve nearly a unity power factor...
In this paper, we validate the effect of Railway Static Power Conditioner (RPC) in TOHOKU SHINKANSEN on actual operation. The validation is made in the case of normal (parallel) and extended feeding condition. By simulation and measuring, it is shown that RPC can be stopped in normal and extended feeding condition.
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