Research On Wind-Solar-Load Coordinated Dispatch Strategies Involving Concentrating Solar Power Plants

In contemporary society,fossil energy is worried to be exhausted and environmental pollution is seriously considered.As a result,the construction and operation of power system have to be developed in the direction of environmental protection,energy saving and low-carbon cleanliness.Based on this situation,an increasing amount of renewable energy has been integrated to the utility grid,showing the characteristics of high proportion and large-scale,as well as,making higher requirements for the adaptability of the power system.The output of Concentrating Solar Power Plants(CSPP)equipped with Thermal Energy Storage System(TESS)is flexible and controllable,which can provide crucial support for integration of renewable energy and effectively improves the reliability and stability of power supply system.Therefore,the dispatching strategy research of the power system with CSPP equipped with TESS has practical significance.Based on the multi-source coexisting pattern and the intelligent process of power system,dispatch strategies after the integration of CSPP equipped with TESS considering source and load uncertainties and demand response are proposed in this paper.The main contents of this paper are as follows:a).Summarize the energy conversion characteristics of CSPP equipped with TESS by explaining their basic structure and operating principle,comparing the advantages and disadvantages of four different types of CSPP,and establishing a universal operation model of CSPP.Later,analyze the multi-source joint dispatch mechanism and source-load coordinated dispatch mechanism including CSPP.b).Based on the energy conversion characteristics of CSPP and multi-source joint dispatch mechanism,a multi-source joint dispatching model involving CSPP is established.Furtherly,using information gap strategy for wind power,light intensity and load demand uncertainties modeling and optimization from two completely different value orientations of risk aversion and risk preference,which provides decision makers both robust dispatching model and opportunistic dispatching model.Dispatchers can make selections according to actual conditions.c).Combine the Model Protective Control(MPC)to establish the prediction model of joint power generation system involving CSPP,and on this basis,a multi-time scale dispatching strategy including intraday rolling optimization and real-time dynamic adjustment is proposed,achieving the tracking of optimization goals.The proposed strategy does not require high accuracy in wind power,light intensity and load demand prediction,and thus has strong anti-interference and robustness.It can not only reduce the influence of uncertain factors on the optimal scheduling scheme to a greater extent,but also satisfy the need of online adjustment in actual operation.d)The demand response mechanism is introduced into the power system dispatching model.In view of the different characteristics of residential loads and industrial loads,a residential load demand response model considering participation factors and an industrial load price-based demand response model are established respectively.And then,a source-load coordinated dispatch strategy for power system after the integration of CSPP considering demand response is proposed,reducing the dispatching cost and promoting the consumption of renewable energy.