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The following topics are dealt with: energy sources; power system deregulation; FACTS and HVDC; power electronics; electrical drives; electromagnetic compatibility and interference; energy management systems; and environmental issues.
This paper gives the State Space modeling of Distribution Static Synchronous Compensator (D-STATCOM). It is important to keep the voltage constant in the distribution system, hence voltage regulation is required in the distribution network. Voltage Source Converter (VSC) based D-STATCOM achieves voltage regulation in the connected bus by absorbing/supplying the required reactive power. The capability...
The power system is a dynamic system that is constantly being subjected to disturbances. It is important that these disturbances do not drive the system to unstable conditions. The Unified Power Flow Controller (UPFC), which is a FACTS device, simultaneously controls the real and reactive power flows on a transmission line as well as regulates voltage at the bus where it is connected. This device...
The distribution network can undergo outages, during which the supply of power is either partially or completely isolated from distribution network to the load centres. To achieve minimum deficit of power supply, proper switching of power lines is required. The power flow path identification in the network is the complicated task of the distribution operators. Based on the survey the papers published...
This paper presents a novel method for capacitor placement in radial distribution feeders to reduce the real power loss and to improve the voltage profile. The location of the nodes where the capacitors should be placed is decided by a set of rules given by the fuzzy expert system. The sizing of the capacitors is modeled by the objective function to obtain maximum savings using Particle Swarm Optimization...
Traditional EDM power supplies convert the energy at low frequency, directly from the utility line and they are able to deal with a wide spectrum of output power. The EDM power supply must achieve high voltage to generate the spark and large current to maintain the ion column. To achieve this, large and heavy transformers and inductances are required. Resonant converters are desirable for power conversion...
The SPWM control in a single FPGA has been developed and implemented. The SPWM IP core is designed using VHDL and a single FPGA, SPARTAN XC3S400PQ208 from Xilinx Inc. The simulations are carried out using Model Sim 5.7 and the implementation is carried out using Xilinx foundation series 9.1i. The PWM patterns have been achieved for different switching and fundamental frequencies. The output fundamental...
This paper proposes a method which consists of a phase shift converter with a current doubler rectifier on the output side, the operating frequency of the phase shift converter being as high as 20-25 kHz (depending on the requirement of the application), ferrite core transformer is used instead of conventional one, which being bulky leads to very large amount of core loss. Unlike the conventional...
In this paper, a hybrid topology that combines clamp-mode coupled inductor and voltage multiplier cell is proposed to provide high voltage gain, reduced switching losses and higher power density. The duty ratio of the converter is also maintained at safe limits while obtaining the required voltage gain. The topology has been designed for a 220V, lkW application operating from 12V input. The reactive...
A 20kW bidirectional dual active bridge DC-DC converter prototype is designed and built for aerospace energy storage applications. The converter employs high power IGBT modules on the high voltage and low voltage sides. This paper presents the theoretical analysis and experimental results of turn-off performance of those high power IGBTs with capacitive snubbers. The turn-off performance of the 1200V,...
This paper investigates the effect of snubber capacitor on the zero voltage switching (ZVS) boundary of the dual active bridge (DAB) DC-DC converter. The analysis is performed to determine the minimum current required during transistor turn-off to achieve successful ZVS and the ZVS boundary operating conditions of the converter are obtained. The operation of the converter during transistor turn-off...
A new adjustable-speed drives (ASD) system based on the high-performance Z-source inverter. It can overcome limitations of conventional Z-source inverter system. The proposed system can operate at wide range load with small inductor. It eliminates the possibility of the DC-link voltage aberrances; simplify the Z-source network inductor and controller design. It increase the inverter modulation index...
The global desire to reduce the vehicle emissions and improve fuel economy accelerated the development of Hybrid Electric Vehicle (HEV). The technology advancements in the area of electric drive systems, battery technologies, fuel cells and the internal combustion engine (ICE) resulted in highly efficient HEV. In this paper the hardware details of three phase, 50 Hz, 6 KW, 180° conduction mode of...
Proton Exchange Membrane fuel cell (PEMFC) is one of the promising technologies for the distributed power generation. For designing high efficiency fuel cell power systems, a suitable DC-DC converter is required. Among the various topologies, interleaved boost converter (IBC) is considered as a better solution for fuel cell systems, due to improved electrical performance, reduced weight and size....
This paper presents an approach for modeling and optimization of the geometry of a flat plate heat sink using genetic algorithm (GA). The responses studied were electromagnetic emitted radiation and thermal resistance of the heat sink. The inputs to GA are the regression equations for predicting the electromagnetic emitted radiations and thermal resistance of the heat sink. The factors considered...
This paper presents a novel space vector pulse width modulation (SVPWM) technique for three phase Z-source inverter. The proposed modified SVPWM has an additional shoot-through state for boosting the dc link voltage of the inverter beside active and zero states. The shoot-through states are evenly assigned to each phase within zero state. So zero voltage period is diminished for generating a shoot-through...
This paper presents the SPMC topology which offers many advantages with unrestricted switch control or with minimal reactive device use, as an all silicon solution. It elucidates the implementation of SPMC as an inverter and as a Controlled Rectifier. Also, with proper switching control algorithm, a type of converter that can buck and boost with step-changed frequency called a Single-Phase Z-Source...
In Multilevel Inverters, Cascaded H bridge converters are considered to be the most preferred form of converters. But in these converters as the number of staircase levels in output voltage increases the dc source requirement also increases, thereby limiting its application. This paper tries to address the above mentioned problem by developing a Modified version of Cascaded Multilevel Converters which...
Compliance with harmonic limits at the point of common coupling (PCC) due to non linear loads is becoming a notable concern for all customers. IEEE 519-1992 Standard has specified certain limits for the harmonic currents and voltages. According to this, the users should limit harmonic current and the supplier should limit harmonic voltages. The harmonic currents and voltages injected at the Point...
This paper advances a novel method for power quality monitoring by using integer lifting wavelet transform (ILWT). ILWT based wavelet uses time domain for its integer calculation and could lessen calculation complexity due to its structure, compared with modified wavelet transform (MWT) and wavelet transform (WT) which depends on floating point coefficients. The whole method is tested over sample...
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