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Renewable energy potential in the form of wind or micro hydro are available in abundance at rural locations far away from city habitat. To harness this green energy the rugged induction generator has come up as a viable option. However, induction generator has change in reactive power requirement with change in load. This dynamic reactive power requirement is proposed to be met by a DSTATCOM and thereby...
Modern HVDC systems are having many advantages than HVAC systems. Two AC systems are connected using a new VSC-MMC based Hybrid HVDC system in this paper which gives many advantages than the conventional HVDC systems and LCC-VSC Hybrid systems. The proposed system gives the fast dynamic response by using different control strategies. The active and reactive power is controlled and the dc line voltage...
Offshore wind farms are becoming an attractive solution for wind power in many developed countries. The voltage source converter (VSC) based multi-terminal high voltage direct current (MTDC) transmission system is an attractive technical option to integrate these offshore wind farms with the onshore grid due to its unique performance characteristics and reduced power loss via extruded DC cables. In...
Active and reactive power flow control and power quality improvement of a two level Voltage Source Converter (VSC) based High Voltage Direct Current (HVDC) system operating at fundamental frequency switching is proposed in this paper. Two converter stations used in this HVDC system consists of two level VSC configuration to achieve active and reactive power control with fundamental frequency switching...
The problem of voltage sags and Swells and its severe impact on sensitive loads is well known. To solve this problem, custom power devices are used. One of those devices is the Dynamic Voltage Restorer (DVR), which is one of the most efficient and effective modern custom power devices used in power distribution networks. This paper described DVR principles and voltage correction methods for balanced...
This paper deals with an integrated electronic load controller (IELC) for an isolated asynchronous generator (IAG), used in constant power pico hydro power generation for feeding three-phase four-wire loads. The IELC is realised using a star/delta transformer and three-leg insulated gate bipolar transistors (IGBTs) -based current controlled voltage source converter (VSC) with a DC capacitor, a chopper...
In this paper, a DSTATCOM (Distribution Static Compensator) using three single-phase VSCs (voltage source converters) integrated with three single phase transformers is employed for the power quality improvement in three-phase fourwire distribution system. Three single phase transformers are used for isolation and connection of H-bridge VSCs. This DSTATCOM provides the voltage regulation or power...
The basic function of VSCs is to convert the DC voltage stored in a capacitor into AC voltages or AC voltages into DC voltage. One of the advantages of the VSC is that this kind of electronic converters allow to control the active and reactive power flow with an ac-grid independently. This paper presents a short analysis of the characteristics and dynamic of VSC-HVDC, identification techniques to...
This paper deals with an electronic load controller (ELC) for a stand alone pico hydro power generating system employing an isolated asynchronous generator (IAG). The proposed controller consists of an electronic load controller (ELC), using two leg IGBT (insulated gate bipolar junction transistor) based voltage source converter (VSC), a DC chopper and an auxiliary load at its DC bus. The neutral...
This paper presents a STATCOM (static compensator) based voltage controller for an isolated asynchronous generator (IAG) driven by bio-gas, diesel engine and gasoline and feeding 3-phase 4-wire consumer loads. The proposed controller consists of an IGBT (Insulated Gate Bipolar junction Transistor) based voltage source converter (VSC) and capacitor at its DC link. The neutral point for the consumer...
This paper presents a voltage and frequency controller with neutral current compensation in an isolated wind energy conversion system employing a capacitor excited asynchronous generator (CEAG). In isolated applications, because of unavailability of the neutral point at the generator terminals, it is difficult to access the neutral wire from the source. In view of this, a transformer integrated with...
This paper presents some new technologies of voltage source converter (VSC), i.e., modular multilevel VSC, for high voltage direct current transmission system based on VSC (VSC-HVDC). The origin of modular multilevel VSC and its essential working mechanism are clarified in detail. Then, the effective protection measures of submodule and the technology of controlled submodule capacitor voltages balancing...
This paper presents a new voltage control strategy for an electronically-interfaced distribution generation (DG) unit that utilizes a voltage-sourced converter (VSC) as the interface medium. The control strategy is based on the concept of voltage-controlled VSC (VC-VSC) rather than the conventional current-controlled VSC (CC-VSC). The proposed VC-VSC 1. enables operation of a DG unit in both grid-connected...
Summary form only given. This paper studies the use of a voltage source converter (VSC) with DC capacitors as energy storage medium for the compensation of pulsating active and reactive power of CERN's proton synchrotron (PS) particle accelerator. The PS accelerator load demands periodic, active and reactive power pulses of about 2 s duration and a magnitude of up to 45 MW and 65 MVAr. The proposed...
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