汽轮机组经济运行方式下新型一次调频技术

节流配汽汽轮机组的经济运行方式是高压调节门全开滑压运行,但调节门全开后机组一次调频加负荷的能力有所下降,很难满足电网大频差下需要快速增加负荷的要求,经济运行方式和一次调频能力之间存在较大的矛盾。为此,研究了补汽阀调节、低压加热器、高压加热器回热系统及抽汽供热系统蓄能利用等技术,综合利用上述技术可以在高压调节门全开方式下,当电网低频动作时较快地增加相应负荷,满足一次调频性能要求。对于顺序阀配汽的汽轮机组,也可以采用这些技术,作为原先一次调频能力的补充,更好地实现大频差下的一次调频功能。

New Primary Frequency Regulation Technologies for Steam Turbines under Economical Operation Mode

Under economical operation mode of throttle admission steam turbines, the sliding pressure operation mode will be enabled with fully-opened high-pressure control valve. However, under this circumstance, the capability of increasing load for primary frequency regulation will be weakened, which makes it difficult to meet the requirement of quick load response to large power grid frequency deviation. Therefore, there exists big contradiction between the economic operation mode and the capability of primary frequency control. In this paper, the technologies of overload control valve adjustment, energy storage utilization in LP and HP regenerative systems, as well as in heat supply system are studied for primary frequency regulation. With the combination of these technologies, in the case of high-pressure control valve at full opening, the unit will increase the load fast when the power grid frequency is low. These technologies may also be used in the steam turbines adopting sequence valve admission to complement the original primary frequency regulation capacity at large frequency deviation.