热网特性对弃风消纳效果的影响研究

Influence of heat network characteristics on abandoned wind absorption effect

储热可平移热负荷,通过削热峰填热谷解耦热电机组"以热定电"约束,提高风电消纳率,故而研究了热网储热、衰减、延时特性对弃风消纳效果的影响。分析了不考虑热网衰减、延时特性时管网储热的弃风消纳机理以及热网衰减、延时特性对管网储热弃风消纳效果的影响。建立了管网储热模型,构建了计及热网储热、衰减、延时特性的电热联合系统调度模型。实例仿真分析结果表明:管网储热配合电锅炉可进一步消纳弃风,且可替代储热式电锅炉的储热装置,节约装置成本;衰减特性引起了热网供热损耗和热源供热功率增加以及管网储热量减少,不利于消纳弃风;延时特性使热电机组供热功率与风电错峰,有利于消纳更多弃风,但不会影响管网储热量和管网储热的弃风消纳效果。

Heat load can be shifted by heat storage,meanwhile,wind power curtailment can be reduced by decoupling"power-heat production"constraint of CHP(Combined Heat and Power) units through peak heat load shifting. The impact of heat storage,attenuation and delay characteristics of heat network on wind power curtailment is investigated. The abandoned wind absorption mechanism of pipe network heat storage is analyzed without considering attenuation and delay characteristics,and the impact of the attenuation and delay characteristics on the abandoned wind absorption effect of pipe network heat storage is analyzed. The heat storage model of pipe network is established,and the operation model of CHP system that considers heat storage,attenuation and delay characteristics of heat network is developed. Simulative results show that the abandoned wind power can be absorbed by combining the pipe network heat storage with electric boilers.In addition,the device cost is saved by replacing the heat storage device of electric boilers with heat storage device. The attenuation characteristic results in the increase of both heating loss and heat source production,and the decrease of heat storage of pipe network,which is not conducive to the absorption of abandoned wind power. The delay characteristic results in different peak time of heat production of CHP units and wind power production,which contributes to accommodating more abandoned wind power. However,it has no effect on the heat storage amount of pipe network and the abandoned wind absorption of pipe network heat storage.