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Traditionally, ancillary market is supported by a lot of conventional generators to produce or use reactive power with the purpose enhance voltage stability. However, in recently years, with the penetration of new wind generations (Double Fed Induction Generator (DFIG) and Direct Drive Synchronous Generator (DDSG)) and through different set of control possibility, wind power plants are able to partly...
In a VSC-HVDC link, a DC fault can lead to destructive overvoltage or overcurrent in DC lines, thus DC protection system plays an essential role for isolating the fault section of the network. This paper presents a combined protection scheme of multi-terminal VSC-HVDC links under DC faults. This scheme uses DC breakers and inductors to limit overcurrent in DC links under DC faults. Simulation results...
Wind power plant installations continue to increase worldwide because it is a kind of renewable and harmful emissions-free energy source. The increased capacity of wind power needs the new strict requirements related to the grid connections of wind generators. The requirements defined in the grid codes can be states as reactive power control, fault ride-through (FRT) capability of the wind turbines,...
In view of the condition and demand of HulunBuir power grid, it could play an important role in enhancing its restoration speed to find or build new power source applied for black-start. Firstly, a black-start scheme is proposed for it, in which the East Hailar Thermal Power Plant in Hailar district can be started through using the Daliang wind farm configured with high-capacity battery energy storage...
Accurate prognosis of wind turbine generator failures is essential for reducing operation and maintenance costs in wind farms. Existing methods rely on expensive, purpose-built condition monitoring systems to conduct diagnosis and prognosis of wind turbine generator failures. In this paper, we present a prognosis method to predict the remaining useful life (RUL) of generators, which requires no additional...
Wind power plants installation in the electrical power networks has been growing through the last years and a larger penetration is expected in the near future. Because of this, wind farm technologies will influence the power system behavior modifying its dynamics by reducing power systems global inertia. Hence, there is an increased interest and need to study the wind turbine farms behavior and their...
Rising environmental concern and depletion of the fossil fuels has given significant importance to renewable energy sources. Wind energy brings new opportunities for the Power System Engineers, they can be termed as confirm alternatives for growing energy demand. The performance comparison of the SCIG and DFIG will yield a promising option for the future Wind Turbine Generators. This research was...
the abundance of freely available wind energy comes with downside of being stochastic and inconsistent in nature. These properties are not particularly suited for a critically balanced system like electrical transmission grid. This work is primarily focused on assessing the effect of uncertain and stochastic nature of wind power on the stresses it imposes on transmission grid. This impact is studied...
This paper studies the impact of utility-scale microgrids on day-ahead (DA) markets, proposes a procedure to manage microgrids in daily operations of a DA market, and provides a guidance in planning new microgrids. As new utility-scale microgrids are being planned and built, the cumulative capacity of microgrids in the U.S. is expected to double in five years. In a region with a significant power...
Integration of wind power generation is increasing rapidly worldwide, hence bringing more challenges to the safe operation of the power system. In this paper, the basic construction method of dynamic security region (DSR) boundary is introduced. A model is established based on DSR, whose object is the minimization of controlling cost in dispatching operations. The coordinated control strategy based...
Three types of offshore wind power collection topologies are studied for DC power systems in this paper. Permanent Magnet Synchronous Generator (PMSG) based Wind Energy Conversion System (WECS) is considered and the Optimal Power Control (OPC) is used for the Maximum Power Point Track (MPPT) control. The failure of a wind power unit is regarded as the fault condition in this paper. Voltage control...
This paper presents modeling and analysis of electrical oscillations in a wind farm system. The detailed modeling and modal analysis of a wind farm system are presented in this paper. The approach to modeling uses detailed representation of a wind turbine generator and collection system including high voltage direct-current (HVDC) power converter system control, facilitating a comprehensive analysis...
This paper presents an alternate iterative method to perform AC/DC optimal power flow (AC/DC OPF) calculation considering wind farm integration. Firstly, an original AC/DC OPF model considering wind farm integration is constructed. Then, according to the decoupling theory in the alternate iterative method, the decoupling optimization model of AC/DC OPF model is derived, where the high voltage direct...
Inertial response from remote offshore wind farms (WFs) connected through point-to-point DC links relies on emulation of the onshore AC system frequency variation at each offshore wind turbine generator (WTG). This is not straightforward for a DC grid interconnecting WFs to multiple onshore AC systems. To address this problem, this paper builds up on a communication-less approach previously reported...
Wind generation is traditionally treated as a non-dispatchable resource and is fully absorbed unless there are security issues. To tackle the operational reliability issues caused by the volatile and non-dispatchable wind generation, many dispatch frameworks have been proposed, including robust unit commitment (RUC) considering wind variation. One of the drawbacks that commonly exist in those dispatch...
This paper presents a multi-objective optimization model based on DC power flow to maximize the active power steady-state security region whilst minimizing the total generation cost. The stochastic and fluctuant nature of wind power is incorporated into the model as well. Regarding the cost of wind power, the concepts involving opportunity costs of wind power shortage and surplus are introduced in...
The delivery of control reserve by fluctuating renewable energy sources (RES) generators will be important in an energy system with high RES penetration. This paper extends a previously introduced methodology to quantify the possible additional income of different pools of fluctuating RES generators in the negative secondary and tertiary control reserve market in Germany. The updated methodology allows...
Wind power generation is increasingly gaining popularity around the world and in the Philippines, with its economic and environmental benefits. However, its intermittent nature poses a problem on power system adequacy, the effects of which must be quantified for reliable system operation and proper expansion planning. The Effective Load Carry Capability (ELCC) is one such metric that can quantify...
The use of renewable energy sources, such as wind power, is of major importance in future power grids for economic and environmental reasons, while the intermittent and stochastic nature of such energy brings challenges to system dispatch. Application of the virtual power plant (VPP) concept is one of the promising ways to improve utilization of renewable power. Among the many issues of practically...
This work considers the optimal long term pumped storage capacity problem for a microgrid equipped with a Wind Farm (WF), Interruptible Loads (IL), transmission line to a main grid and Pump Storage (PS). Typically, the WF is operated according to wind speed to charge PS and supply electrical power to satisfy the load demands. A linear model is established to describe the system dynamics of the central...
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