Optimal Dispatch Of Virtual Power Plant Considering Distributed Generation And Controllable Load

With the intensification of energy shortages,environmental pollution and other issues as well as the increasing demand of electricity from users,the power industry is facing enormous challenges.Traditional power generation can no longer meet the future demand of electricity production and supply.Virtual power plant is helpful in integrating a large amount of distributed energy resources in the smart grid,providing an effective solution to the above problems from a new perspective.In this paper,the virtual power plant theory is applied as the research background and the load characteristics of several types of demand response resources are analyzed.Based on that,the control mode and strategy of demand response resources are mainly focused on and a virtual power plant based dispatching management system is designed and built:First,some related contents of virtual power plant theory and demand response technology is elaborated.The fact that advanced metering infrastructure(AMI),load forecasting and enabling technologies can be used as the technical support for virtual power plant is also explained.Secondly,by analyzing the load characteristics of air-conditioning and water supply system,the corresponding control modes and strategies are formulated.Due to the characteristics that single air-conditioning and water supply system have low potential on loads reduction and they distribute dispersedly,the load-aggregator-based control mode is used to integrate load resources and achieve unified dispatch and control.Meanwhile,owing to the characteristics of air-conditioning,its control strategies mainly include switch control,temperature control and cycle suspension control.Besides,the loads reduction of water supply system can be achieved by changing its setting pressure.Thirdly,the design of the software and hardware for a FPGA-based energy monitoring device was completed.As for the hardware level,the external circuit which contains instrument transformer and AD converter is built,using FPGA as its main control chip.When it comes to software level,the AD sampling control and power parameter calculation is achieved relied on FPGA.In addition,the GPRS-network-based wireless transmission is also realized.Finally,the interface of dispatching management system based on the virtual power plant was built by using LabVIEW.This host computer can realize remote monitoring and control of multiple air conditioners and water supply systems.