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This paper investigates the characteristics of parallel connected three phase inverters based on modular design and distributed control. Every inverter module has a local hardware manager and the whole system has a central application manager. The hardware managers and application manager are connected together by the optical fiber to build a fiber ring net structure. The fiber ring net can achieve...
This paper proposes a space vector modulation of a high frequency AC-inked matrix converter which is applied to an electric transformer system. The one of problem of a commercial frequency transformer is bulky and heavy. In order to resolve this problem, we propose to use a high frequency transformer driven by three-phase to single phase matrix converter. In this paper, the virtual indirect control...
In this paper, a multiple wireless power transfer system for multiple gate driver supplies of a medium voltage inverter is developed. The proposed isolation system achieves a galvanic isolation with an air-gap of 50 mm using a wireless power transfer with magnetic resonance coupling. It easily respects the standard of galvanic isolation, which is established by International electrotechnical commission...
This paper proposes a maximum torque per ampere control strategy for direct torque controlled interior permanent magnet synchronous motor drives. The feature of the proposed method is the ability to search the optimal current directly and successively. Therefore, variations of the parameters can be considered. The simulation and experimental results validate the proposed method.
This paper develops an integration slidingmode controller (ISMC) for a full-bridge single-ended-primary-inductance converter (SEPIC) supplied to an inverter-fed AC motor drive. Configuration of the developed SEPIC-based system is that a full diode bridge connected AC-to-DC SEPIC converter with power factor correction (PFC) is built for stably supplying DC voltage to the inverter. Under this configuration,...
This paper examines the control performance of a permanent magnet synchronous motor drive system based on direct torque control (DTC) using a SiC-MOSFET inverter (SiC inverter). The dead-time of the inverter affects the performance of the motor control. In high-speed drives, the dead-time effect increases because the control period becomes shorter. By using a SiC inverter for which the switching speed...
The PRM which uses reluctance torque positively and reduced the amount of magnets relatively, and the industrial low-voltage inverter to which the PRM control function is applied has been developed. Though exact motor parameters may not be known, the inverter has a control method which on-site PMM control commissioning can be performed easily for such the case. The combination test of the PRM and...
The design of optimized modulation schemes at low pulse ratios, e.g. Selective Harmonic Elimination (SHE), has been widely studied. However, most previous work has focused on half-wave symmetry pulse patterns. For variable speed and variable torque applications, non-half-wave symmetry SHE modulators depending on the power factor angle still achieve highly efficient inverters in many power factors...
This paper presents high performance maximum power point tracking (MPPT) of a grid-tied PV power system via terminal sliding mode control (TSMC). Based on the proposed TSMC method, the output current of the grid-connected inverter is regulated to the maximum power point in finite time. Moreover, the inverter current is synchronized to the grid voltage, such that the current harmonic is reduced. In...
This paper proposes a new impedance-source inverter named as magnetically coupled T-source inverters (MTSI). The proposed circuit employs a three-winding coupled transformer and a capacitor formed in T-shape to produce a higher voltage gain in comparison with the traditional Z-source inverter (ZSI), Trans-Z-source inverter (trans-ZSI) and Г-source inverters (ГSI). While maintaining the main features...
A high efficiency 3-phase hybrid 7-level inverter is presented in this paper. Compared with traditional hybrid 7-level converters, the proposed topology and its T-type cell have lower power loss and simple configuration. It can be easily implemented and applied in renewable energy areas. In the paper, power loss of proposed T-type cell is analyzed, by which conduction loss of T-type cell is proved...
Aiming at the problems of poor dynamic control performance and difficult filter design for three-level grid-connected inverter with low switching frequency, a three-level discontinuous PWM strategy and its carrier-based implementation method are introduced. Considering the strategy's output harmonic characteristics, an LLCL filter is adopted. Then, aiming at the resonance problem of LLCL filter, two...
The limitation of DC current injection to grid is critical for transformerless grid-connected PV inverter. In this paper a novel control strategy for three phase PV inverter is proposed in order to suppress DC current injection to the grid. It is based on idea of accurately sensing the DC offset voltage of three-phase PV inverter output. Since each one of the DC components in the three-phase inverter...
In this paper, the energy conversion efficiency (ECE) and cost characteristics of three-phase photovoltaic (PV) inverters (3P-PVIs) are studied comprehensively based on the operating principles of topologies and with respect to various performance indicators such as semiconductor device count and utilization factors, semiconductor efficiency (SE), dc-bus capacitor and filter inductor voltage/current...
In this paper the small-signal model of a three-phase photovoltaic inverter is upgraded to include the grid-voltage feedforward. The feedforward is shown to increase d and q-components of the inverter output impedance which makes the inverter more insensitive to impedance-based interactions and explains the reported improvement in the output current harmonics. However, using a low-pass filter in the...
This paper proposes a current sensorless maximum power point tracking (MPPT) control strategy for a dual-mode photovoltaic (PV) module-type interleaved flyback inverter (ILFI). A flyback inverter, which is one of many transformer topologies, is generally used because of its simplicity and low cost. The topology used in this paper is the interleaved topology; therefore, the secondary ripple current...
For the problem that paralleled inverters cannot share reactive power proportional to their power capacity in islanding microgrid. Originally, the effect of inverter output impedance and line impedance to reactive power sharing with conventional droop control is analyzed. Following, a method adjusting the output reactive power by paralleling capacitor at the inverter output is proposed, and the relationship...
This paper presents the efficient limit setting for state of charge (SOC) to match with respect to the solar irradiance, load condition while special consideration based on analyzing the number of operational hours of diesel generator and lifetime of the battery. The hybrid PV/diesel standalone system is located in Ranau, Sabah, Malaysia.
In this paper the implementation of the galvanic isolation in the low voltage direct current (LVDC) network is discussed. The galvanic isolation can be implemented either with a 50 Hz transformer located at the customer AC output of the customer-end inverter (CEI) or with an isolated DC-DC converter at the input DC network side of the CEI. However, the former solution results in a significant increase...
In this report, energy saving characteristics of a main circuit system having the inverter which applied SiC elements and Motor whose v/f is reduced were reported. As a main circuit system, an effective way of energy saving was examined, and evaluated. It was also put on the experimental vehicle, E995, and the electricity reduction effect against the existing system was evaluated.
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