基于旁路系统提升热电机组风电消纳能力研究

针对中国三北地区冬季供热期弃风现象严重的问题,提出利用高低压旁路供热解耦传统热电机组的电热强耦合关系,并基于旁路系统供热的热电机组电热特性,建立风电消纳能力数学模型,根据电网调峰需求,给出热电机组的运行策略。结果表明:高低压旁路系统参与供热可大幅提升热电机组的风电消纳能力和供热能力。为了保证高低压旁路供热安全,要注意高低压旁路蒸汽流量的匹配关系。采用"传统抽汽+高低压旁路"切换方式供热,风电消纳能力最强。以某330 MW热电机组为例,采用高低压旁路供热可进一步提升供热能力90.56%;在满足额定供热量的前提下,采用"传统抽汽+高低压旁路"切换方式供热可进一步提升热电机组风电消纳能力324.46%。

IMPROVING WIND POWER ACCOMMODATION OF COMBINED HEAT AND POWER PLANT BASED ON BYPASS SYSTEM

In Three-North area of China,the curtailment of wind power is a serious problem,especially in winter,the High PressureIntermediate Pressure(HP-IP)bypass heating was proposed to decouple the close relationship between power and heat. Based on the power and heat characteristics of CHP plant with bypass heating system,a series of mathematical models of wind power accommodation were established. According to the peak regulating demand of power network,the operation strategies of CHP plant were given. Results show that the capacity of wind power accommodation and heating can be greatly improved by HP-IP bypass heating. In order to ensure the safety,the steam flow rate of HP-IP bypass should be matched. The capacity of wind power accommodation is the best by"traditional extraction steam + HP-IP bypass"heating. Taking a 330 MW unit as research object,the heating capacity increases by 90.56% using HP-IP bypass heating. At the rated heat load condition,the capacity of wind power accommodation increases by 324.46% using"traditional extraction steam+ HP-IP bypass"heating.