Optimal Scheduling Of Combined Heat And Power System Based On Variable Load

In order to improve the energy utilization rate and consumptive space of the renewable energy and reduce the dependence on traditional energy,the integrated energy system combines independent energy together to take full advantage of the complementary characteristics of energy.The thermoelectric unit as the core component is a typical model of it to realize the supply of power demand and thermal demand for users.Thermal power makes up a large portion of "Three North" power source,and there is a lack of flexible power for peak regulation.In addition,in order to meet the large demand for heat load at winter night,the thermal power unit is mainly running under the condition of"heat fixed power",which bring about a mount of forced electric power.In order to solve the serious problem of wind power curtailmentcondition,this paper proposes to add electric boilers as variable load in the CHP system and to convert the electric power into heat and supplying the heat load.Under the heat and power balance of the system,the starting and stopping time of the electric boiler is adjusted,and the economy of the system is analyzed.The work of this article is as follows:Design the dispatch scheme of CHP system contains electric boilers to consume wind power.Firstly introduce the power types and composition of "Three North",analyzing the reasons why the wind power is abandoned seriously.Then pointing out that the wind power is abandoned seriously mainly because the proportion of thermal power in this area is mainly generating units.In the winter night,the thermoelectric runing under the condition of "heat fixed power"will produce a large number of forced electric power,which leades to the difficulties in peak shaving,resulting in a lot of wind power is abandoned.It was proposed to add electric boilers in the cogeneration system as the variable load to solve the abandoned wind problems.Establish balance equation of the CHP system.By analyzing the operation principle and operation conditions of thermal power units,coal consumption characteristic model of each unit,optimization scheduling model of the CHP systems is built,which is different from conventional optimization model.And then this paper introduce the improved particle swarm optimization(PSO)algorithm with penalty function and constraint regulation,analyzing the concrete steps of this algorithm when solving the question,which makes preparations for subsequent solution.Analyze the scheme’s economical efficiency.Establishincome model while revenue from selling electricity and selling warm and the cost from electric boiler depreciation,operation cost of electric boiler and fuel cost of units.And then analyze the influence of time-of-use price in user side and generation side to system revenue.Validate the feasibility of the proposed scheme by example simulation.It is proved by an example that adding the electric boilers in the CHP system can reduce the peak heat supply of the thermoelectric unit and decouple the "heat fixed power" operation constraint of thermoelectric units.Finally,it can provide more space for the wind power and enhance the wind power consumption.