Combined Heat And Power Optimal Dispatching With Wind Power Integrated

The energy structure of three north area in China is mainly composed by coal power,meanwhile there are multiple large wind power bases programmed by state in recent years.The serious deficiency of peaking power sources and the high proportion of CHP(combined heat and power)units operating at the ordering power by heat mode caused the insufficiency peak load regulation capacity of electrical power system.Therefore it has been more and more difficult for power grid to handle the randomness,volatility and intermittent caused by wind power.The stability and security of operation for power grid are seriously impacted,causing a mass of wind abandoning and potential security risks.For the sake of promoting the safe and efficient utilization of renewable energy in three north area,this paper constructs the research of combined heat and power optimal dispatching with wind power integrated from the consideration of joint coordination dispatching of power system and thermal system.Firstly,the characteristics of CHP units are introduced and the optimal dispatching model for heat-power load with wind power integrated,which minimizes the coal consumption of the system and considers comprehensive operating constraints of heat-power joint system,is constructed.Grid-plant coordination optimization scheduling scheme based on the operating characteristics of thermal plant is proposed,and the genetic algorithm is applied to solve this model.The simulation results indicate that the proposed scheme can effectively solve the multi-area power-heat dispatching problems as well as excavate the peak regulation capacity of CHP units,and provides solid foundation for the research of thermoelectric decoupling.Secondly,the wind power heating technology has been encouraged by state to be applied to implement the thermoelectric decoupling to promote the consumption of wind power in recent days.So this paper constructs heat-power load joint optimal dispatching model with wind power heating,which minimizes the coal consumption of the system and is solved by the grid-plant coordination optimization scheduling scheme.The comprehensive benefits of wind power heating and the separate benefits of each interest entity are calculated by the scheduling results,and the optimal allocation of wind power heating is fulfilled.The simulation results indicate that wind power heating can improve the consumption rate of wind power and reduce the operating costs and coal consumption of electrical power system.The effectiveness and rationality of the method of choosing optimal wind power heating allocation is also validated.While under the current centralized scheduling and independent accounting of power system,the wind power heating needs to be motivated by policies and subsidies and is hard to be applied in a large scale.Finally,in order to solve the problem that wind power heating,which can effectively improve the consumption rate of wind power,is hard to be applied in a large scale,this paper introduces the concept of VPP(virtual power plant).The large thermal power plants and renewable energy in a certain heating area are aggregated into a VPP and participate in the power system operating as a whole,the wind power heating is added into this VPP as deployable resources of load sides.The VPP heat-power optimal scheduling model with wind power heating is constructed,which maximizes the daily operating benefits of VPP and is solved by adaptive immune genetic algorithm.The simulation results indicate that using wind power heating to accomplish the thermoelectric decoupling in VPP can effectively reduce the VPP deviation and environmental costs and increase the VPP benefits.The advantages of VPP as an interest whole are also incarnated by the comparative study of independent accounting and are conducive to promote the consumption of renewable energy and the implementation of wind power heating.