摘要
为了适应电网负荷随时间的波动,机组协调控制系统(CCS)需不断调整机组功率,以保证电网运行的平衡和稳定。为此,以某超临界机组CCS为例,分析了其控制系统的动态特性,通过仿真试验对比了2种典型CCS策略对机组一次调频和自动发电控制(AGC)指令的响应特性。分析结果表明,2种锅炉主控和汽轮机主控的不同组合下,在调频死区和调速不等率一致的情况下,机组对一次调频和AGC指令的响应特性取决于汽轮机主控,机组主蒸汽压力连续变化量则取决于锅炉主控;在小扰动情况下可以仅考虑汽轮机主控的影响;在较大扰动情况下不同锅炉主控对应的系统参数波动量可能超过压力控制死区,引起汽轮机主控输出的变化,使系统的输出受到较大影响。
Aiming at adapting to the load fluctuation in power grid,the unit coordinated control(UCC)system frequently regulates the power of each generation unit to ensure the equilibrium and stability of power grid.Thus,the UCC system of a supercritical unit was taken as the research object to conduct investigation on its dynamic characteristics.Through simulation experiment,the response characteristics of two typical UCC strategies to primary frequency regulation and automatic generation control(AGC)were compared.The results showed that,with two different combinations of boiler master control system and turbine master control system,when the dead band and speed drop were constant,the continuous variation of main steam pressure mainly depended on the boiler master control system;when small disturbance occurred,the main factor was the turbine master control system;while in large disturbance condition,the fluctuations of different boiler master control systems' parameters may exceeded the pressure control dead band,causing change of the turbine master control system's outputs,which will affect the system output seriously.
出处
《热力发电》
CAS
北大核心
2013年第10期86-90,共5页
Thermal Power Generation
