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At microgrids, classical grid-regulating generators are replaced by converter-interfaced distributed generation (DG) or energy storage systems (ESSs). This causes a reduction of the total inertia of the system and hence the microgrid voltage and frequency become more susceptible under power variations. DC microgrids are specially affected by this phenomena as systems with rotating inertia can not...
The concept of microgrid can integrate large amounts of Distributed Generations (DG) into power system and provide higher reliability, energy security and surety to critical loads. A Virtual Droop Control (VDC) method is proposed for the power management and voltage and frequency regulation and has been applied to the Fort Sill microgrid. The state space models for the microgrid components and systems...
The application of two control strategies for shunt-connected FACTS devices to enhance the transient stability of a power system will be discussed in this paper. The main focus will be on the use of active power in the FACTS device and therefore a STATCOM with active power injection capability will be considered. The first approach represents the classical cascade controller that consists of an inner...
When wavelet variation operation is increased on the basis of standard particle swarm optimization algorithm (SPSO), an innovative hybrid particle swarm optimization algorithm (HPSO) is formed. Based on the HPSO, aiming to the UHV power system containing 1000 kV and 500 kV, we can carry out the coordination optimization of emergency control for transient stability problem, here, the transient stability...
This paper presents a comprehensive energy storage system (ESS) application design for regulating wind power variation and increasing wind energy integration and grid voltage stability. The design includes a method for calculating a reference output profile, a charge-discharge scheme for directing the ESS operation, and an optimization-based method for determining ESS optimal rating. The efficacy...
Penetration of distributed generation (DG) has significantly increased over the last few decades. Several states in USA have set their own target to meet significant percentage of DG penetration over the years. These requirements will have impacts on grid reliability and operational requirements given inherent intermittency for some of the DG. Energy storage integrated with DG has been proposed as...
The integration of large-scale distributed generation (DG) and energy storage significantly affect the dynamic behaviors of distribution systems. Distributed systems are facing new challenges in terms of their dynamic behaviors due to the addition of large-scale DG into low-voltage distribution systems. This paper analyses the important effects of the penetration of large-scale wind, solar and energy...
Using energy storage systems (ESS) for regulating wind farm power output variation is a promising application. It is known that wind farm output variation has negative impact on load following and grid voltage stability. ESS can be used to store certain amount of wind power and re-dispatch it appropriately. In this way ESS can reduce the wind farm output variation and the adverse stability-related...
A multi-index nonlinear coordinated control scheme for BESS and generator excitation is proposed. The proposed multi-index nonlinear coordinated controller can effectively coordinate the dynamic and steady-state performance of the controlled system. It can enhance the stability of the system, improve the dynamic characteristics of state variables, and can improve the control accuracy of output variables...
For studying the damping effect of power system controllers, such as PSS and FACTS stabilizers, Phillips-Heffron model has been used extensively and many analytical conclusions and design methods have been developed on the basis of Phillips-Heffron model. Hence, in order to carry out systematical investigation on the damping effect of ESS controllers on power system oscillations, this paper established...
Application of high efficiency energy storage techniques may stimulate in a near future a larger exploitation of renewable energy sources. Energy storage, in fact, not only can improve the quality of produced power, but also make possible the implementation of sophisticated energy management strategies, fully decoupling the power delivery from power generation. In such a scenario, Vanadium Redox Batteries...
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