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Switch Mode Power Supply forms an integral component of the modern day power supply systems. Owing to multiple voltage conversion requirements, there is need for a SMPS system which not only mitigates the system harmonics but also provides an efficient and reliable power conversion. In this paper, an 18-pulse input fly-back converter based SMPS system has been proposed which intends to overcome the...
This paper proposes a high step-up, transformerless, dc/dc converter suitable for applications where high efficiency at low power throughput is required. The proposed converter achieves high step-up dc/dc conversion through a resonant LC tank and realizes high-efficiency operation via the softswitching enabled by this resonant network. Flat efficiency is obtained via discontinuous conduction mode...
This paper proposes bidirectional cascaded quasi-Z-source dc-dc converter (BC-qZSC). Compared to the traditional cascaded quasi-Z-source network (C-qZSN), the diodes in C-qZSN are replaced by active switches with a parallel diode. BC-qZSC has the higher boost ability and the lower input current ripple than those of the bidirectional quasi-Z-source dc-dc converter (B-qZSC). In this paper, the operational...
This paper deals with the development of an adaptive control system applied to voltage regulation of a standalone distributed power generation system, fed by self-excited induction generator. The generation system considers a four wire three-phase grid, composed by three phases plus neutral conductor, fed by three-phase three wires induction generator. The neutral conductor is created from the neutral...
In this paper a gain scheduling control scheme is presented for a three-level three-phase voltage source converter for high-voltage direct-current transmission system (VSC-HVDC), based on two neutral point clamped (NPC) converters in Back-to-Back configuration. The proposed model in dq0 is developed in detail and it has the advantage over other solutions of facilitating the mathematical analysis....
Recently, devices for manufacturing semiconductor products require plasma. Plasma is generated by two types of high frequency power, a High/Low and an ON/OFF output. A power supply, which can output the high frequency power is required to be more efficient and more compact. In order to achieve high frequency output with the High/Low pulse, the output capacitance in a power supply should be reduced...
The main advantages of multilevel inverters are the improved power quality and higher efficiency. Cascaded H-Bridge (CHB) multilevel inverters are widely used in photovoltaic grid-connected generators, electric vehicles and motor drive systems. However, the CHB multilevel inverters require a large number of isolated dc power supplies, which make these inverters complicated to implement in industrial...
Modular multilevel converter (MMC) is a promising multilevel topology for high-voltage applications that has been developed in recent years. The control of MMCs has been analyzed in detail in many papers, showing that the converter capacitors can be kept charged and balanced by controlling the circulating current of each leg. The set-point signal of the circulating current is probably the most difficult...
In this paper, the development of a novel controller for a bidirectional buck and boost converter is studied to implement an active capacitance. To this end, an averaging method is used to obtain a nonlinear state-space model of the converter in the Continuous Conduction Mode (CCM) for buck and boost configurations, separately. These models are then combined into a state-space representation for the...
This tutorial paper presents the concepts of sliding mode controller (SMC) and sliding mode observer(SMO) design for different DC/DC converters. Design and implementation aspects, using FPGA, of sliding mode controller and sliding mode observer for three basic topologies of DC/DC converters are discussed. Sliding Mode Control, an established technique for control and estimation, is implemented for...
Cascaded H-Bridge (CHB) multilevel converters provide a number of attractive features for photovoltaic (PV) power systems. They have high quality output waveforms, high efficiency and the ability to incorporate multiple Maximum Power Point Tracking (MPPT) schemes. This paper investigates the ability of the CHB PV system to export maximum power for different configurations of PV arrays among the H-Bridges...
STATic synchronous COMpensator (STATCOM) can be integrated into electric transmission systems to provide reactive power compensation and grid voltage support for achieving high-efficient and reliable Flexible AC Transmission Systems (FACTS). An emerging solution for STATCOM with modular structure and multilevel voltage output, named as modular multilevel STATCOM (mmSTATCOM) shows its great advantages...
In this paper, a novel approach for control of the DC-DC buck converter in high-power and low-voltage applications is proposed. Designed method is developed according to passivity based controller which is able to stabilize output voltage in a wide range of operation. It is clear that in high-power applications, parasitic elements of the converter may become comparable with load value and hence, in...
This paper presents suppression control of the module capacitor voltage fluctuation for the Cascade Static Synchronous Compensator (STATCOM). In the control of the reactive current of the cascade STATCOM, the instantaneous power of the each module fluctuates by twice the source frequency. Therefore, the module capacitor voltage of the cascade STATCOM fluctuates by twice the source frequency. If the...
The plant bandwidth plays a vital role in the design of any feedback controller. Its importance is more for repetitive controller (RC) based systems because it is required to provide higher gains at desired frequencies. This paper discusses design of the repetitive controller (RC) for a LCL filter based grid connected inverter with special emphasis on plant's bandwidth. The relation between plant...
Modular multilevel converters have several attractive features such as high voltage capability and scalability, the excellent quality of the output voltage waveforms, a modular structure and the utilisation of standard components. Despite of all these benefits, the main drawback of this converter is the control system complexity due to the multiple external and internal control objectives. One of...
Based on the so-called decoupling principle, the three-level NPC inverter can be decoupled into two three-level buck converters. With assuming balanced neutral-point voltage between the DC-link capacitors, a new discontinuous pulse width modulation (DPWM) strategy is developed in this paper. Operation principle and simulation results of the proposed modulator are presented. Experimental results from...
A new Hybrid Boosting Converter(HBC) is proposed in this paper. It combines the advantages of regulation capability of traditional inductor based DC-DC converters and gain boosting ability of switched capacitor converters. It is capable of boosting the input voltage to ten times with single active switch and one inductor while maintaining high efficiency. In addition, the switch stress is low and...
With the development of photovoltaic (PV), fuel cells and uninterruptible power supply (UPS), high step-up converter plays an important role in them. In this paper, a single switch high step-up DC-DC converter is proposed, which can achieve high voltage gain without extreme duty cycle and huge turn ratios of coupled inductor. The leakage energy of coupled inductor can be recycled and the voltage across...
This paper presents a dc capacitor voltage balancing convtrol method for the star-connected cascaded H-bridge PWM converter in the static synchronous compensator (STATCOM) applications. The proposed control utilizes the zero-sequence voltage injection to accomplish the dc capacitor voltage balancing, and the this operation of zero-sequence voltage does not affect the original reactive power control...
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