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Dual-active-bridge (DAB) DC-DC isolated converter is widely used in many applications e.g. power supplies, transportations and renewable power systems. In this paper, general modulation characterization and optimization of DAB converters have been analyzed and advanced modulation methods are proposed. Simulations and experiments are implemented to verify the effectiveness of the proposed modulation...
This paper discusses the dead-time effect of dual bridge series resonant DC/DC converter (DBSRC). The phase-shift modulation is usually adopted in DBSRC. However, the phase-shift angle is usually small, and voltage polarity reversal (VPR) may occur in dead-time, which may deteriorate EMI/EMC and increase loss. This paper analyzes the commutation of DBSRC when VPR occurs and proposes a method to eliminate...
The semi-controlled open-winding permanent magnet synchronous generation system with a common dc bus provides a flowing path for zero sequence current, which will decrease the efficiency of the whole control system. To solve zero-sequence current of the semi-controlled open winding PMSG system, a model predictive current control (MPCC) method is proposed based on the analysis of the working principle...
In order to improve steady and dynamic characteristics, a sliding mode control for a phase shifted full bridge DC/DC converter with fixed switching frequency is presented. Mode of the full bridge DC/DC converter is established by averaged current method. Linear combination of output voltage and its differential and integral is chosen to design sliding mode surface. The proposed algorithm is validated...
Multilevel inverters has acquire a great attention of modern power electronic systems. It offers less distortion and electro-magnetic interference and hence, it can be used in medium voltage and high power applications. The aim of this research article is to propose a new asymmetric type multilevel inverter with minimum number of power switches. The proposed inverter produces 7-level voltage waveform...
In This paper we are presenting a bidirectional DC-DC converter is also known as dual active bridge (DAB) dc-dc converter. We presented a Z-source with bidirectional dc-dc converter by reducing the switching count by adding the passive elements we are improving the output voltage level, Comparing with the traditional bidirectional dc-dc converter, the proposed converter has an wider regulation range...
In order to regulate the output voltage in converter system with four-quadrant characteristic a quasi-Z-Source Converter (qZSC) is preferred. The converter can provide bi-directional current and bipolar output voltage with minimal number of elements. In this converter two active switches with complimentary commands and a quasi-Z-source network is required and there is no need to coupled inductors...
Traction converters in automotive applications benefit from various emerging technologies like semiconductor-materials such as SiC or converter topologies like multilevel converters. As especially novel topologies often lack an analytic way to determine their power losses or efficiency, comparability is often hard to achieve until each converter is built up and measured. With the proposed procedure...
To efficiently implement the technology validation and test of power electronic devices, a new test method is presented, APF controller closed-loop simulation based on RTDS. Simulate those primary circuits by software in RTDS, such as three-phase grid, load and APF inverter bridge, DC side capacitor and circuit breaker. The APF control and protection part are done through the control panel in real...
The characteristic to shield harmonics of the novel converter transformers is presented in this paper. Then design the DC transmission system of the novel transformer to achieve harmonics shielding function, by adopting the novel transformer on the rectifier side. Based on the calculation method of harmonic content in the HVDC system, calculate and allocate the reactive power compensation on both...
Inhomogeneous current sharing between parallel IGBTs can compromise the capability of power modules to withstand short circuit events. Especially if the gate voltages are influenced by coupling effects, single IGBTs will carry excessive currents. This paper analyzes the effects of different parameters on the maximum short circuit current of a 1.7kV power module composed of three parallel half bridge...
Many devices need DC source with low ripple for normal operation. Three-phase bridge rectifiers are most commonly used as the base unit in the source. A simulation model built in MATLAB/SIMULINK is used to analyze the operating of DC source under unbalance mains. The simulation results characterize quality of output voltage versus unbalance of phase voltage.
The paper aims at various techniques to approximate fractional capacitor using passive elements. The fractional capacitors have been used to implement an astable multivibrator, sinusoidal oscillator, function generator and filters. PSPICE simulation results have been shown for the circuits both with and without using the fractional capacitors. By comparing the simulation results, it can be shown that...
Zero-Voltage and Zero-Current-Switching (ZVZCS) phase-shifted full-bridge (PS FB) pulse-width-modulated (PWM) converter, which can achieve Zero-Voltage-Switching (ZVS) of the leading leg and the Zero-Current-Switching (ZCS) of the lagging leg in a wide load range. It has the advantages of simple structure, less duty cycle loss and easy to implement soft switch and so on. In this paper, the working...
This paper presents an analysis of the operation of cascaded H-Bridge Converter with bypassed cells during fault conditions. Several new properties of the converter are derived for maximizing the output line voltages of the converter. It is achieved by adjusting the phase angles of the three reference signals given to individual legs of the converter. Analytical expressions for the phase angle is...
Static synchronous compensator (STATCOM) with delta configuration has been widely applied to compensate reactive current, unbalance current and harmonics in a three-phase three-wire system. When the phase reference currents are calculated, there are infinite number of solutions with a given set of line currents for a delta-connected STATCOM. This paper proposes a phase harmonic reference currents...
Fast isolation and detection of DC faults is currently a limiting factor in high power DC transmission grid development. Recent research has shown that the role of DC/DC converters is becoming increasingly important in solving various DC grid challenges such as voltage stepping, galvanic isolation and power regulation. This paper focuses on an additional important feature of bidirectional dual active...
Multilevel cascaded H-bridge converters are becoming popular for next generation large-scale photovoltaic power converters. However, the power generation levels in the three phases can be significantly unequal, especially in a large plant, owing to the non-uniform irradiance levels and/or ambient temperatures. This paper proposes the delta-connected cascaded H-bridge converter for large-scale photovoltaic...
This paper explores a new bidirectional dc-dc converters(BDCs) composed of two full bridge converters. The steady-state of the dual-bridge dc/dc resonant converter with a series-parallel resonant tank is analyzed with ac analysis approximation in this paper. A variety of characteristics as a constant voltage gain conditions can be identified from the analysis results. With the LC3L type dual-full...
In order to develop and validate smart grid technologies with complex control and communication, detailed modeling of distribution systems using the Real Time Digital Simulator (RTDS) is invaluable [1]. At the distribution system level, testing a 13 kV power electronic device without first validating its controls is cost prohibitive. RTDS provides a cost effective way to study smart grids at not only...
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