Power optimizer

About: Power optimizer is a research topic. Over the lifetime, 10525 publications have been published within this topic receiving 199245 citations.

Efficient and Security Transmission of Wind,Photovoltaic and Thermal Power of Large-scale Energy Resource Bases Through UHVDC Projects

Abstract: Since the environment problem caused by fossil fuel consumption is intensified,wind power as the most technically mature clean energy in the world has been developed rapidly.In the last decade,wind power made significant progress in China.At present,accommodation capability of wind power in Northwest,Northeast and North China tends to be saturated.With the planned integration of large-scale photovoltaic power,it is urgent to transmit redundant renewable power to loads of other regions.The main problem of wind power operation was analyzed in this paper.The feasibility of transmitting large-scale renewable power located in Northeast and Northwest to North,East and Central China grid through ultra high voltage direct current(UHVDC) projects was systematically researched.The practical calculation method of matched power capacity and the scheduling production simulation method were presented,based on transmission capacity,typical wind output curves and PV curves.The security and stability calculation process is concluded.The proposed method was proved to be effective by simulating project cases.The study results show that curtailment capacity of wind and PV power will be minimized by optimizing the proportion of wind,PV and thermal power on the basis of power system security and stability.And renewable energy will be developed effectively,which is of obvious significance to optimizing structure of power source,improving air quality and achieving the goal of energy conservation and emission reduction.

Reactive power capability of the wind turbine with Doubly Fed Induction Generator

Abstract: With the increasing integration into power grids, wind power plants play an important role in the power system. Many requirements for the wind power plants have been proposed in the grid codes. According to these grid codes, wind power plants should have the ability to perform voltage control and reactive power compensation at the point of common coupling (PCC). Besides the shunt flexible alternating current transmission system (FACTS) devices such as the static var compensator (SVC) and the static synchronous compensator (STATCOM), the wind turbine itself can also provide a certain amount of reactive power compensation, depending on the wind speed and the active power control strategy. This paper analyzes the reactive power capability of Doubly Fed Induction Generator (DFIG) based wind turbine, considering the rated stator current limit, the rated rotor current limit, the rated rotor voltage limit, and the reactive power capability of the grid side convertor (GSC). The boundaries of reactive power capability of DFIG based wind turbine are derived. The result was obtained using the software MATLAB.

Modeling and Controller Design of a Semiisolated Multiinput Converter for a Hybrid PV/Wind Power Charger System

Abstract: The objective of this paper is to propose the development of a multiinput dc–dc converter (MIC) family, which is composed of isolated and/or nonisolated dc–dc converters. By analyzing five basic isolated dc–dc converters, four isolated pulsating voltage source cells and three isolated pulsating current source cells are generated. Moreover, a semiisolated multiinput converter (S-MIC) for hybrid PV/wind power charger system which can simplify the power system, reduce the cost, deliver continuous power, and overcome high-voltage-transfer-ratio problems is proposed. In this paper, the operational principle of the proposed S-MIC is explained, the small-signal ac model is derived, and the controller design is developed. Computer simulations and experimental results are presented to verify the accuracy of the proposed small-signal ac model and the performance of the proposed S-MIC.

A Power Decoupling Method Based on Four-Switch Three-Port DC/DC/AC Converter in DC Microgrid

Abstract: This paper presents a power decoupling method based on a four-switch three-port dc/dc/ac converter in dc microgrid. The proposed topology has three interfaces which can be connected with a dc source, a capacitor, and an ac port. With a corresponding power flow control method, this converter can decouple the low-frequency ripple power which is necessary for the ac port and undesirable for the dc source with small capacitor. The proposed topology is compact and cost-effective because, compared with the H-bridge inverter, no extra switches or devices are required. With the model of the proposed dc/dc/ac converter, a power control method with two inductors' current control is presented for power decoupling. In addition, the control parameters are designed as well. Experimental results on the laboratory prototype verified the feasibility of the proposed topology and the designed power control method.