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The deployment of modern DFIG or full converter turbine technologies on a large scale into distribution networks is raising issues for electric utilities with regard to voltage rise and flicker amongst other power quality issues. This paper proposes an real-time reactive power coordination scheme employed with the voltage control technique, the concurrent means for achieving both voltage regulation...
The goal of the U.S. Department of Energy (DOE) roadmap [1] is a 20% penetration of wind energy into the generation mix by 2030. Attaining this objective will help protect the environment and reduce fossil fuel dependency, thus improving energy security and independence. This paper discusses how the technology used in large scale offshore wind farms impacts voltage regulation in distribution feeders...
Namibia is currently at a stage of integrating Wind Power into the National grid. This paper investigates the technical impact of grid integration of wind power on subtransmission networks in Namibia. Distribution voltage is defined as any voltage below and including 44kV while transmission voltage is voltage levels above 44kV, transmission voltage forms a basis for this study. The authors analyse...
Wind generation has been the fastest growing power source over the past decade and this growth is forecasted to continue. The new trend is adding large wind plants to achieve economy of scale. As large wind plants are likely to contribute to significant shares of the energy, they also bring new challenge in system operation. These challenges include connection of large wind farms to weak grids, securing...
Large-scale integration of wind turbine generators (WTGs) may have significant impacts on power system operation with respect to bus voltages, system frequency, etc. Voltage control and reactive power compensation in a weak distribution network for integration of wind power represents the main concern of this paper. Without reactive power compensation, the integration of wind power in a network may...
This paper presents analysis of voltage regulation by using STATCOM to reduce voltage fluctuation in the grid connected wind farms. A STATCOM is installed at the main bus of power system network, point of common coupling, (PCC), which wind turbine generator systems (WTGS) or wind farm is connected to the power system. STATCOM technology is shown to mitigate voltage fluctuation and to improve power...
In this paper, a novel night-time application of a photovoltaic (PV) solar power farm bidirectional inverter as a battery charger, is presented. It is shown that a combination of PV solar farm and storage batteries can be advantageous in a distribution system having wind farm in close vicinity to the solar farm. Under such a condition, the PV solar farm inverter can regulate the grid voltage (if allowed...
This paper reports experimental validation of a static synchronous compensation (STATCOM) by controller hardware-in-the-loop (CHIL) testing with a real-time digital simulator (RTDS). The controller is designed and developed for a 10 MVA STATCOM for voltage regulation at the PCC of a 50 MW wind farm connected to a 69 kV utility grid. Emitter Turn-off (ETO) thyristors are switching devices in the multilevel...
In recent years, there has been a worldwide growth in the exploitation of wind farms. Because of increasing wind generation, growing non-liner loads and competitive electricity markets the operation mechanism of power systems are facing some problems such as transient stability, voltage regulation, damping of power oscillation, power flow control, etc. Among shunt FACTS devices STATCOM has been recognized...
As a promising renewable alternative, the wind power is highly expected to contribute a significant part of generation in power systems in the future, but this also bring new integration related power quality issues, which mainly consist of voltage regulation and reactive power compensation. Wind power, as a rule, does not contribute to voltage regulation in the system. Induction machines are mostly...
The technical challenges imposed by increasing connection of distributed generation (DG), Distribution Network Operators (DNOs) require new voltage control schemes to manage the networks in a more active manner. In a conventional centralised scheme, voltage regulation is primarily performed at the substation according to the existing and predicted load downstream. However, this operation may leave...
This paper introduces a methodology to enhance the quality of the voltage and power produced from fixed-speed direct-connected wind turbines. The method uses an electrolyzer/fuel cell combination to be connected to the point of common coupling via limited rating converters. The control scheme is designed to keep the power ramp rate and voltage fluctuation within their limits and to minimize the rating...
In 2005 the author published an article in North American Windpower magazine that discussed how in recent years power generation projects using wind turbines have been required to operate in a similar manner to conventional generating resources. The subject was later presented during Panel Session ldquoOptional Characteristics of Wind Farmsrdquo at the 2006 IEEE PES General Meeting held in Montreal,...
The growth in distributed energy resources has the potential to reduce system stresses caused by transmission grid congestion by supplying power and voltage regulation closer to load centers. However, the additional voltage regulation provided by these resources can mask the onset of voltage collapse. Local voltage support flattens the slope in the upper region of the power-voltage nose curve. Coordinating...
This paper presents a new technique for regulating grid-connected wind farms terminal voltage. The wind farm under investigation is assumed equipped with doubly-fed induction generators (DFIGs). The proposed technique is based on using the grid-side converter to regulate the farm's terminal voltage rather than using the rotor-side converter to achieve this task. Description for the studied system...
Operation of today's very large scale and interconnected electric power systems depends critically on the devices that facilitate management of power flow on the grid. These devices can be based on passive components such as capacitor and inductor, or rely on the solid state power electronics technology to achieve much faster control bandwidth. Widely known as FACTS (Flexible AC Transmission system)...
This paper addresses some of the most significant challenges for wind generation facilities, including voltage control, reactive power management, dynamic power-swing stability, and behavior following disturbances in the power grid. This advanced hierarchical control of both real and reactive power output can provide dynamic performance that is, superior to that achievable with modern conventional...
This paper addresses some of the most significant challenges for wind generation facilities, including voltage control, reactive power management, dynamic power-swing stability, and behavior following disturbances in the power grid. This advanced hierarchical control of both real and reactive power output can provide dynamic performance that is, superior to that achievable with modern conventional...
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