汽轮机超速保护控制对电网频率的影响研究  

INFLUENCE OF USING OVER SPEED PROTECTION CONTROL OF STEAM TURBINE UPON THE FREQUENCY IN POWER GRID AND COUNTERMEASURES THEREOF

作　　者：马呈霞[1] 王宏伟[1] 秦睿[1] 郭钰锋[2] 夏岩[3] 葛智平[1] 陈林[1] 

机构地区：[1]甘肃电力科学研究院,甘肃兰州730050 [2]哈尔滨工业大学电气工程及自动化学院,黑龙江哈尔滨150001 [3]兰州理工大学电气工程与信息工程学院,甘肃兰州730050

出　　处：《热力发电》2011年第12期70-72,76,共4页Thermal Power Generation

摘　　要：在孤网运行状态下传统超速保护控制(OPC)由于汽轮机转速的较大波动会使汽轮机调节阀频繁动作,影响电网频率的稳定性。为此,以中间再热式汽轮机为例,建立了多区域单机无穷大系统仿真数学模型。通过对孤网运行状态下不同OPC保护定值对电网频率稳定性影响的仿真,提出了孤网运行状态下发电机组解列时适当提高OPC保护定值的措施,以及在OPC控制逻辑中增加并网、解列、孤网运行3种控制方式的方案。The traditional overspeed protection control （OPC） uner operation state of isolated power grid may make the govener valve of steam turbine to be frequently actuated due to large fluctuation in rotation speed of the steam turbine, affecting the stability of frequency in power grid. For this, taking the reheated steam turbine as example, a mathematical model for emulating the multiregional single machine infinite system has been established, the influence of different set values of OPC upon the stability of frequency in power grid under operation state of isolated power grid has been emulated, the measures of suitably enhancing the set value of OPC during the time of decoupling the units being put forward, and adding three control modes, i. e. synchronizing, decoupling, and isolated grid operation, into the control logic of OPC.

关 键 词：汽轮机 OPC 孤网运行 电网频率 超速 

分 类 号：TK31[动力工程及工程热物理—热能工程]