Feasibility analysis of changing turbine load in power plants using continuous condenser pressure adjustment
Feasibility analysis of changing turbine load in power plants using continuous condenser pressure adjustment
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DOI：
10.1016/j.energy.2013.11.001
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发表时间：
2014
期刊：
影响因子：
9
通讯作者：
Wei Wang;D. Zeng;Ji-zhen Liu;Yuguang Niu;Can Cui
中科院分区：
文献类型：
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作者：
Wei Wang;D. Zeng;Ji-zhen Liu;Yuguang Niu;Can Cui
多种发电方式的互补，可以减少大规模新能源电力并网造成的电力系统功率波动较大的问题。水力发电、燃气发电、燃油发电等快速发电是最适合的互补电源。然而，它们在中国非常短；与此同时，变电速度慢的煤电占主导地位。因此，煤电必须加大负荷变化的范围和速度，才能在电力系统中承担电力补充的任务。本文提出了一种通过控制冷却水流量来提高水冷电厂变负荷能力的方法。在保证机组安全的前提下，提出了冷凝器冷却水控制系统（CCWCS）来实施该方法。在稳定负荷条件下，CCWCS还可以降低煤耗。在对凝汽器、凝汽器冷却水用变频泵进行建模的基础上，结合汽轮机输出功率对凝汽器压力的变化特性，给出了冷却水流量与汽轮机输出功率之间的关系。最后，以60万千瓦机组为例，验证了该方案的可行性。
A variety of power generation complementary can reduce the large power fluctuation in the electrical power system caused by large-scale new energy power connected into grid. The quick power generation such as hydropower, gas power, and fuel power are the most suitable complementary power. However, they are very short in China; meanwhile the coal-fired power with slow rate of power change is dominant. Consequently, the coal-fired power has to increase its load change range and speed so as to undertake the job of power complementation in the electric power system. This paper proposes a method to improve the load change capacity for the water cooled power plants through controlling the cooling water flow. Then the CCWCS (condenser cooling water control system) is put forward to execute this method on the premise of unit safety. CCWCS can also reduce the coal consumption in steady turbine load conditions. Based on the modeling of condenser, variable speed pump for the condenser cooling water and the characteristics of turbine power output to condenser pressure, the paper presents the relationship between the cooling water flow and turbine power output. Finally, a case study on a 600,000 kW unit proves the feasibility of our idea.