Application research of converter in back pressure extraction steam turbine in feed water system

LIN Yicun; PU Jianguo; GAO Jinghui; LYU Haitao; ZHANG Mingli; YAN Wenchen; YANG Bo; SHAO Yafei; ZHANG Yifan

doi:10.19666/j.rlfd.202109194

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Application research of converter in back pressure extraction steam turbine in feed water system

更新时间：2025-09-28

- Application research of converter in back pressure extraction steam turbine in feed water system
- Thermal Power Generation Vol. 51, Issue 4, Pages: 179-187(2022)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 华能秦煤瑞金发电有限责任公司
  3. 西安益通热工技术服务有限责任公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202109194
  CLC： TM46;TM621
- Published：2022
- 稿件说明：
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LIN Yicun, PU Jianguo, GAO Jinghui, et al. Application research of converter in back pressure extraction steam turbine in feed water system[J]. Thermal power generation, 2022, 51(4): 179-187.
DOI：

LIN Yicun, PU Jianguo, GAO Jinghui, et al. Application research of converter in back pressure extraction steam turbine in feed water system[J]. Thermal power generation, 2022, 51(4): 179-187. DOI： 10.19666/j.rlfd.202109194.

摘要

在抽汽背压式汽轮机（back pressure extraction steam turbine

BEST）构成的双机回热系统中增设电机变流器组，可使BEST启动更具有灵活性。对该系统的运行及控制方式进行了介绍，并在机组试运过程中，在不同运行工况下进行了一系列系统的试验。结果表明：变流器对BEST转速的控制精准度较高，且变流器电动工况与发电工况可平稳切换；此外，事故工况下，变流器与小汽轮机电液控制系统（micro electro-hydraulic control system

MEH）之间的控制切换具有迅速、扰动小的特点，保障了机组运行的稳定安全。以上试验验证了变流器在BEST驱动给水泵系统中应用的实际可控性、安全性和稳定可靠性。最后，通过经济性计算，投入变流器后机组在热耗率验收工况下满负荷运行时可节约标准煤约2.1 g/(kW·h)，具有一定的经济效益。

Abstract

Adding motor and converter to double-turbine regeneration system composed of backpressure extraction steam turbine(BEST) can make the BEST start more flexible. The operation and control measures of the system are introduced

and a series of system tests are carried out under different conditions during the unit commissioning.The results show that

the converter has relatively high accuracy on control of the BEST rotation speed

and the electric/power generation mode can be switched smoothly. Under accident conditions

the switching between the converter control and micro electro-hydraulic control system(MEH) control has the characteristics of rapid and small disturbance

which ensures the safety and stability of the unit operation. The above tests verify the actual controllability

safety

stability and reliability of the converter in the BEST in the feed water system. Through the economic calculation

the unit can save about 2.1 g/(kW·h) of standard coal when running at full load under THA condition

which has certain economic benefits.

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