Topic
Power optimizer
About: Power optimizer is a research topic. Over the lifetime, 10525 publications have been published within this topic receiving 199245 citations.
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TL;DR: In this article, a robust optimization-based AC optimal power flow (RACOPF) model for power networks with uncertain wind power generation is presented, which outperforms the robust DC-OPF model in the literature.
Abstract: This letter presents a robust optimization-based AC optimal power flow (RACOPF) model for power networks with uncertain wind power generation. Numerical results on three test systems with uncertain wind power show that the RACOPF outperforms the robust DC-OPF model in the literature.
76 citations
06 Mar 2005
TL;DR: The analysis considers different loss mechanisms and gives out quantitative descriptions of the power losses and useful design criteria and can be extended to other switched-capacitor converters.
Abstract: This paper presents a detailed analysis about the power losses and efficiency of multilevel dc-dc converters. The analysis considers different loss mechanisms and gives out quantitative descriptions of the power losses and useful design criteria. The analysis is based on a three-level multilevel dc-dc converter and can be extended to other switched-capacitor converters. The comparison between the theoretical analysis and the experimental results are shown to substantiate the theory
76 citations
TL;DR: In this paper, the authors proposed a real power control strategy for a direct-drive WECS that employs the permanent magnet synchronous generator, which is based on rapid torque control as opposed to the traditional pitch-angle control.
Abstract: As the penetration of wind energy into the power system continues to grow, wind energy conversion systems (WECSs) are increasingly expected to be able to control their output real power, while retaining their maximum power-point tracking (MPPT) capability This paper proposes a simple real power control strategy, which augments the MPPT feature of modern WECSs, and is based on rapid torque control as opposed to the traditional pitch-angle control This paper presents the implementation of the proposed control strategy for a direct-drive WECS that employs the permanent-magnet synchronous generator, even though the proposed method can also be extended to other classes of electronically interfaced WECSs The paper also presents a parameter-tuning procedure for the proposed control strategy The effectiveness of the proposed control strategy is demonstrated through mathematical analysis and time-domain simulation studies
76 citations
TL;DR: In this article, a coordinated control scheme is presented in order that offshore wind power plants (WPPs) connected through multiterminal HVDC systems are able to contribute to the primary frequency control of the land AC grids.
Abstract: In the last years, wind power has continuously increased the participation in the power generation share. For transmitting the power generated from wind power plants (WPPs)to AC grids, multiterminal high-voltage direct current (HVDC)systems are envisaged as the future backbone of a European SuperGrid interconnecting wind power generation with various AC grids and countries. This paper presents a coordinated control scheme in order that offshore WPPs connected through multiterminal HVDC systems are able to contribute to the primary frequency control of the land AC grids. The proposed control scheme is capable of achieving a suitable frequency regulation even under low wind power conditions by allowing also the power share among AC areas. The control scheme is evaluated by dynamic simulations in an adapted version of the Cigr DC grid benchmark with a five-terminal HVDC grid including two wind farms and three AC networks.
76 citations
TL;DR: In this paper, the Vanadium Redox Flow Battery is shown to be capable of providing frequency response capability to the wind farm, and a novel controller is introduced, which manages the state of charge of the battery while providing some output smoothing.
Abstract: Providing frequency response capability from wind farms is technically feasible, but relies on spilling the wind. Wind intermittency and the planned expansion in offshore wind power in the U.K. are expected to lead to increased requirements for frequency response capability. This may necessitate times where wind farms operate in a frequency sensitive manner and output only a proportion of the available power. Compensating for spilt wind energy would likely lead to increased costs of balancing the power system. This paper highlights the alternative to spilling wind to provide frequency response capability: using wind farm level energy storage. The Vanadium Redox Flow Battery is shown to be capable of providing this and other benefits to the wind farm. The work further demonstrates that ιow batteries could often be incorporated with reactive power compensation equipment such as a wind farm level IGBT SVC. The control of the power electronic interface of the battery is introduced and a control method for supporting the dc link under grid faults is developed and simulated. This control is shown to give the added benefit of supporting the fault current contribution through an extended and severe fault. The capability of the Vanadium Redox Flow Battery to enhance power and energy applications is then explored by considering integrated control with a wind farm to energy time shift and provide frequency response. A novel controller is introduced, which manages the state of charge of the ιow battery while providing some output smoothing to the wind farm and a variable level of reserve for the power system. The simulations of this controller also demonstrate that the energy store can be used to time-shift some of the wind farm's energy to times of higher prices.
76 citations