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This paper proposes a model predictive control-space vector modulation (MPC-SVM) method to achieve current ripple reduction and neutral-point voltage balance in three level inverter. The proposed MPC-SVM method is based on subdivision strategy for improving the performance of the conventional model predictive control (MPC) method. The proposed subdivision strategy consists of two parts: current controller...
This paper presents an ac ripple repression method for neutral-point voltage of three-level inverter system with electrolytic capacitor less. To reduce the volume of three-level inverter system, electrolytic capacitor with huge capacitance is must eliminated from dc-link. In the inverter system applying film capacitors, however, the ac ripple component in neutral-point voltage of dc-link is increased...
This paper proposes modulation and control strategy for a single-phase to three-phase (1p-3p) indirect matrix converter (IMC) drives. The 1p-3p IMC is composed of a singlephase current source rectifier (1p-CSR) and a three-phase voltage source inverter (3p-VSI). The 3p-VSI is operated with modulation strategy similar to that of a common inverter. The 1p-CSR must be operated with a restriction where...
This paper presents discontinuous pulse width modulation (DPWM) scheme for a modular multilevel converter (MMC) to achieve an advanced switching losses reduction. The MMC is considered to be one of the most attractive multilevel topology for high-power applications because of the features of its high power quality, modularity, and availability. However, the MMC has large switching losses because of...
This paper proposes optimal switching period phase-shifted method for slave inverter to reduce grid current ripples in synchronized two parallel three-phase grid-connected voltage-source inverters (VSI). In parallel operation, a 180 degree phase shifted method generally takes of advantage of reducing grid current ripples in same DC-link voltage for each grid-connected VSI. However, in case of unequal...
This paper proposes an improved phase-shifted pulse-width modulation (PS-PWM) method for a three-phase cascaded H-bridge (CBH) multi-level inverter. In the proposed PS-PWM method, the switches at one leg of H-bridge cell (HBC) only operate and the switches at other leg are clamped. Therefore, the number of the multi-carrier signals depending on the voltage level can be reduced in half compared to...
DC-link current ripple is a key point of the dc-link capacitor design for conventional inverters. The allowable current ripple is specified according to the capacity of capacitor. If the dc-link current over-ripple is produced by an electrolytic capacitor, it causes high heat-value, shortening of lifetime, and low-reliability. Thus, large passive components are commonly used for reducing the dc-link...
This paper proposes the model predictive control with the space vector modulation (MPC-SVM) method for the current control of the voltage source inverter (VSI). Unlike the conventional MPC method using the limited number of voltage vectors by switching states, the various voltage vectors can be taken into account to find the optimized voltage vector in the proposed method. The various voltage vectors...
This paper proposes zero voltage switching (ZVS) bi-directional DC-DC converter with auxiliary circuit. The conventional DC-DC converter has the problem which is switching loss by the hard switching. The proposed ZVS bi-directional DC-DC converter uses the soft switching with an additional circuit to decrease the switching loss. The additional circuit is made up the resonant inductor and back-to-back...
This paper proposes a control strategy for the mono converter dual parallel (MCDP) surface-mounted permanent magnet synchronous generator (SPMSG) in the wind power generation (WPG) system. Since the MCDP SPMSG in the WPG system means that two generators are connected to the mono converter in parallel, it can reduce the cost and simplify the configuration of the WPG system compared to fundamental power...
This paper proposes a carrier-based pulse width modulation (CB-PWM) method with synchronous switching technique for a Vienna rectifier. In this paper, a Vienna rectifier is one of the 3-level converter topologies. It is similar to a 3-level T-type topology the used back-to-back switches. When CB-PWM switching method is used, a Vienna rectifier is operated with six PWM signals. On the other hand, when...
This paper presents a scheme to improve the input current ripple of capacitor-less inverter system using a predictive control algorithm. The capacitor-less inverter, which is using small capacitor in the dc-link, has several advantages such as competitive cost, compact size, enhanced reliability, and elimination of initial charging circuit. However, the dc-link voltage shows instability because the...
This paper presents the switch-fault detection method in a cascaded H-bridge multilevel inverter (CHBMI). When the open-fault occurred on the H-bridge inverter switch of single-phase CHBMI, the body diode of fault switch can provide a freewheeling current path. However, the output current distortion of short-fault is different from that of the open-fault because disconnection of fuse cannot provide...
This paper proposes a design scheme of the LCL-filter for space vector PWM (SVM) at the three-level inverter system. Although there are several studies in progress, the conventional methods are erroneous because they do not focus on the other switching methods. This paper shows the design methodology for an LCL-filter optimized in SVM switching. The design sequence for the LCL-filter is presented...
This paper proposes a modulation method to reduce power losses and achieve high efficiency for a single-phase NPC three-level inverter. In conventional switching methods, the bipolar and unipolar pulse width modulation methods are commonly used in a single phase inverter. However, these switching methods have the disadvantages in aspects of the power loss. The several clamp switching methods aggravating...
This paper proposes a low voltage ride through (LVRT) control strategy for energy storage systems (ESSs). The LVRT control strategies for wind turbine systems and photovoltaic systems have been researched until now. Regardless of the energy source, the main aim of the LVRT control strategies for a grid side converter is to inject the reactive power according to the gird code regulations. The main...
This paper proposes a control scheme for the wide operation range of an induction generator (IG) with a Vienna rectifier. A Vienna rectifier has the limited operation range because the sign of the current should be the same as that of the voltage in the normal operation. For this reason, the power factor of a Vienna rectifier is also limited. In the IG, the d-axis stator current is necessary for the...
This paper proposes a simple sensorless control method based on an extended electromotive force (EEMF) models for an interior permanent magnet synchronous motor. The EEMF contains the position information of a motor. The EEMF can be estimated by using a lease-order observer. The proposed method estimates the position and speed of a motor using a phase locked-loop based on an EEMF. Because the calculation...
This paper proposes reduction of dc-link current ripple in unbalanced input voltage of three-parallel interleaved boost converter. The non-overlapped interval of diode currents of each boost converter can be occurred in case of the unbalanced input voltage. Therefore, the ripple of the dc-link current is increased. The non-overlapped interval is removed by adding the calculated phase to the carriers...
This paper proposes an improved direct torque control (DTC) method for five-phase induction motor drive. The proposed DTC technique is accomplished by selecting the optimal voltage vector. Five-phase inverter has many case of voltage vector which compared to three-phase inverter. The voltage vectors are composed with two zero voltage vectors and thirty effective voltage vectors in five-phase inverter...
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