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This paper discusses the active and reactive power control method for a modular multilevel converter (MMC) based grid-connected PV system. The voltage vector space analysis is performed by using average value models for the feasibility analysis of reactive power compensation (RPC). The proposed double-loop control strategy enables the PV system to handle unidirectional active power flow and bidirectional...
Induction heating (IH) appliances are widely used for industrial appliances and home electronics because IH has a lot of merits. Recently, wireless power transfer attracts attention as a promising industry. As for wireless power transfer, inductance is changed in accordance with power transmission distance or surrounding environment. Similarly as for IH, inductance and resistance as equivalent circuit...
An alternative implementation of asymmetric cascaded H-bridge (ACHB) inverter is presented in this work. The presented ACHB inverter is using a single DC source. The main bridge is directly connected to the DC source (such as, battery, fuel cell or photovoltaic array). And the auxiliary bridges are fed by isolated series resonant converter (SRC). Voltage of the auxiliary bridge is balanced by controlling...
This paper presents an isolated high-gain topology which employs resonant boost converter with coupled inductor or boost transformer for the Photovoltaic (PV) micro-converter system. The given configuration has the features of resonant soft switching, galvanic isolation, high gain and low switching losses. The proposed system uses LC series resonant tank circuit and had resonant operation both during...
This paper proposes control of 3-level inverter with small DC-link capacitance and grid filter inductance for high speed motor drive system where regeneration and hold-up time are unnecessary. The controller consists of three simultaneously operating sub-controllers; High speed motor controller for flux weakening and maximum torque per ampere (MTPA) control, neutral voltage controller for DC-link...
Three-phase Z-source inverter (ZSI) is a relatively new buck-boost-type inverter topology, which in photovoltaic (PV) applications offers more efficient power point tracking than traditional VSI-type inverter in a single power processing stage. This paper presents an accurate small-signal model for the impedance network present in three-phase grid-connected ZSI, which can be used to e.g. design its...
This paper investigates the single-switch short-circuit fault response of a permanent magnet (PM) machine drive using a current source inverter (CSI). The CSI offers some appealing advantages over conventional voltage-source inverters (VSIs) during short-circuit fault conditions originating inside the inverter. Two post-fault strategies are investigated in this paper, consisting of either: 1) turning...
Recently, reduction of toxic substances included in exhaust gas, and conversion to a low carbon society are demanded for the purpose of environment protection. To prevent global warming, it is important to progress energy-saving technologies and environment protection technologies. IH (Induction heating) technology is useful for energy-saving because it is an efficient heat source. In this study,...
A high-frequency-link (HFL) micro inverter with a front-end diode clamped multi-level inverter and a grid-connected half-wave cycloconverter is proposed. The diode clamped multi-level inverter with an auxiliary capacitor is used to generate high-frequency (HF) three level quasi square-wave output and it is fed into a series resonant tank to obtain high frequency continuous sinusoidal current. The...
This paper presents a novel single stage, single phase, common ground, transformer-less inverter for PV application. The ideal gain of the inverter is minus infinity to plus infinity. Converter is derived from intelligent circuit connections of Ćuk converter and Watkins-Johnson converter. The control to output transfer function contains right half plane (RHP) zeros, which leads to a limited closed...
Micro-inverters operating into the single-phase grid from solar photovoltaic (PV) panels or other low-voltage sources must buffer the twice-line-frequency variations between the energy sourced by the PV panel and that required for the grid. Moreover, in addition to operating over wide average power ranges, they inherently operate over a wide range of voltage conversion ratios as the line voltage traverses...
In this paper, the performance and experimental results of adjustable frequency and current high frequency quasi-resonant inverter is described. This inverter circuit includes the first resonant capacitor and that of the second resonant capacitor with one-way short-circuit switch and can output the variable frequency from 160kHz to 400kHz by using power Metal Oxide Semiconductor Field Effect Transistors...
In recent years, kinetic energy storage systems with electric double layered capacitor (EDLC) bank have been widely studied and developed for the fuel cell electric vehicles(FCEV). In this paper, a full-bridge/push-pull inverter based isolated bi-directional DC-DC soft switching converter for EDLC interface is proposed. The DC-DC converter mentioned here has the great advantage that the number of...
In this paper, characteristics of a high frequency quasi-resonant multi-frequency output inverter using power Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) as switching devices is described. This inverter circuit includes the first resonant capacitor and the second resonant capacitor with a one-way short-circuit switch. Synthetic series capacitance is varied by manipulating the switch...
A new concept to realize efficient capacitive-coupling contactless power transfer One-Pulse Switching Active Capacitor (OPSAC) was proposed. OPSAC is composed of single phase inverter with a dc capacitor. The inverter switches only one time per cycle of supply voltage. The biggest advantage of the proposed active capacitor is simple operation and inherent stability. In this paper, a new control method...
In this paper an interleaved Class D-E resonant converter is proposed. Analysis, design, and evaluation of the proposed converter are presented. The interleaving approach utilizes two half-bridges to dislocate two resonant tanks in the Class D inverters, which results in a single control unit and a 180 degree phase-shift switching angle designs in the proposed topology. While the analog control method...
This paper presents single stage series load resonant ZVS-PWM high frequency inverter which operates one diode conduction mode and critical ZCS PFC rectifier for induction heating (IH) applications. This single stage inverter is composed of a single phase PFC rectifier operating at one diode conduction mode and asymmetrical ZVS-PWM high frequency resonant inverter without the interlink bulky electrolytic...
This paper researches the electronic ballast based on self-coupled transformer for 70 W high pressure sodium lamp. The original power source comes from the grid, a boost pre-regulator between the input rectifier bridge and the filter capacitor serves unity power factor purpose. A buck topology with the LCpCs resonant circuit, which consists of self-coupled transformer and capacitors, satisfies the...
A single-stage electronic ballast topology with the properties of high efficiency and low stress is proposed in this paper. The ballast consists of a voltage fed half-bridge series-resonant series-parallel-load (SRSPL) inverter, playing the role of lamp driver, and a voltage boost converter, which shares low side switch device with half-bridge inverter and acts as power-factor-correction (PFC). The...
In order to adapt the miniaturization and low EMI of pulsed power supply, a novel quasi-resonant piezoelectric transformer converter for high voltage pulse capacitor charging was developed. The system has the advantages of simple structure, absorbing the switch capacitive parameters and zero voltage switching (ZVS). Therefore, this converter is suit to operate under high-frequency conditions. The...
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