Development and Challenge of Flexible Operation Technology of Thermal Power Units Under New Power System

doi:10.12096/j.2096-4528.pgt.23079

Abstract

Abstract:

Under the background of “dual carbon”, new energy sources have begun to be connected to the grid on a large scale. However, the randomness and volatility of new energy generation significantly impact the power grid, making it urgent to build a new power system. As the cornerstone of the power system, traditional thermal power will transform into a basic security and system regulatory power supply, providing reliable capacity, peak regulation and frequency modulation and other auxiliary services. The flexible transformation of thermal power units has become an inevitable choice. The phased objectives, difficulties, and challenges of building a new power system were analyzed, along with the problems encountered in the flexible transformation of thermal power units at the present stage. Combined with thermal power operation data, the technical ways of configuring energy storage equipment for thermal power units were analyzed. The research shows that there are several issues in building a new power system, such as power system instability, difficulties in transforming traditional thermal power, high energy consumption, and environmental pressures. The flexibility transformation of thermal power units faces challenges such as insufficient peak regulation capacity, high operation costs, slow load response, high operation energy consumption, safety concerns, etc. The integration of thermal power and energy storage will bring better economic and environmental benefits.

Key words: new power system, thermal power units, subsynchronous oscillation, linear active disturbance rejection control, impedance model, direct-driven wind turbine, weak grid

CLC Number:

TK 01

Fangfang WANG, Pengwei YANG, Guangjin ZHAO, Qi LI, Xiaona LIU, Shuangchen MA. Development and Challenge of Flexible Operation Technology of Thermal Power Units Under New Power System[J]. Power Generation Technology, 2024, 45(2): 189-198.

Figures/Tables 7

References 52

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灵活性参数	中国煤电		世界先进机组
灵活性参数	已建机组	改造潜力	世界先进机组
最小出力/%	50	30	20
爬坡速率/(%/min)	1~2	3~6	4~5
热态启动时间/h	3~5	4	1.5~2.5
冷态启动时间/h	10	5	<10

灵活性参数	中国煤电		世界先进机组
灵活性参数	已建机组	改造潜力	世界先进机组
最小出力/%	50	30	20
爬坡速率/(%/min)	1~2	3~6	4~5
热态启动时间/h	3~5	4	1.5~2.5
冷态启动时间/h	10	5	<10

参数	负荷
参数	30/%	40/%	50/%	60/%	75/%	85/%
煤耗率/[g/(kW⋅h)]	342	326	313	305	305	305
年运行时间/h	200	300	800	1 000	1 500	2 000
燃煤单价/(元/t)	1 350	1 350	1 350	1 350	1 350	1 350

参数	负荷
参数	30/%	40/%	50/%	60/%	75/%	85/%
煤耗率/[g/(kW⋅h)]	342	326	313	305	305	305
年运行时间/h	200	300	800	1 000	1 500	2 000
燃煤单价/(元/t)	1 350	1 350	1 350	1 350	1 350	1 350

污染物	负荷
污染物	30%	40%	50%	60%	75%	85%
CO₂	53 920	102 494	328 024	479 460	898 988	1 358 470
SO₂	175	333	1 064	1 556	2 917	4 407
NO _x	152	289	926	1 354	2 539	3 837