Analysis Model to Study the Influence of Electrocarbon Coupling on Settlement Price of Coal Power Units in Spot Market

doi:10.11930/j.issn.1004-9649.202301056

Abstract

Abstract:

The coal power industry has generated the largest proportion of carbon dioxide emissions, which makes itself the first entity to be introduced into the national carbon market, while carbon emission costs will also have certain impacts on the settlement of electricity prices in the coal power spot market. Hence, this paper constructs a bidding scheduling model for coal-fired power units in the spot market and conducts simulation analysis with and without considering the cost of carbon emissions respectively. Finally by taking the power market of Guangdong Province as the study case, the changes in the spot market bidding and clearance of coal power units are simulated under the scenarios of so-called "with vs. without wind power output" and "different carbon markets". The results show that with the gradual improvement of the carbon market, the price and total quota amount of carbon are further tightened, and the bid price of coal-fired power units increases gradually, so does the settlement electricity price in the spot market. The average electricity clearing prices in the light, moderate, and heavy carbon markets in the summer with wind and light are 0.1607 CNY/(kW·h), 0.1863 CNY/(kW·h), and 0.2461 CNY/(kW·h), respectively, up by 0.18%, 16.14%, and 53.41% compared to the scenarios when the carbon market is not introduced.

Key words: carbon market, spot market, settlement price of electricity, cost of carbon emission, electrocarbon coupling

Xiangguang LI, Qingbo TAN, Fanqi LI, Xudong LI, Zhongfu TAN. Analysis Model to Study the Influence of Electrocarbon Coupling on Settlement Price of Coal Power Units in Spot Market[J]. Electric Power, 2024, 57(5): 113-125.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202301056

https://www.electricpower.com.cn/EN/Y2024/V57/I5/113

Figures/Tables 21

Fig.1 European Union carbon quota prices

Fig.2 Annual transaction price of carbon quota in China's eight pilot carbon markets from 2013 to 2022

Fig.3 Trend of daily transaction average price in national carbon market

Fig.4 Carbon trading process

Fig.5 Coupling relationship in“electricity-carbon” market

Table 1 Carbon market scenario settings

指标		轻度情景	中度情景	重度情景
有偿配额比例/%		5	30	50
碳价/(元·t^–1)		58.53	100	200
机组碳排放强度/ (t·(MW·h)^–1)	300 MW≤P＜600 MW	0.941	0.941	0.941
	600 MW≤P＜1000 MW	0.843	0.843	0.843
	P≥1000 MW	0.795	0.795	0.795
配额分配基准值/ (t·(MW·h)^–1)	300 MW≤P＜600 MW	0.979	0.857	0.767
	600 MW≤P＜1000 MW	0.877	0.765	0.698
	P≥1000 MW	0.877	0.765	0.698

Fig.6 Typical daily load and solar output curve in summer of Guangdong

Table 2 Three conventional coal power units are subdivided

机组编号	单机容量/ MW	容量等级/MW	厂用电率/ %	负荷率上限/%
1	300	300≤P＜600	4.05	100
2	600	600≤P＜1000	5.24	100
3	1000	P≥1000	4.92	100

Table 3 Average coal consumption of power supply of coal power unit at each load rate

机组编号	不同负荷率下的供电煤耗/(g·(kW·h)^–1)
机组编号	≥90%	80%~90%	70%~80%	60%~70%	50%~60%	45%~50%
1号	298	301	304	309	316	326
2号	289	291	295	301	310	321
3号	272	273	277	284	293	304

Table 4 Production consumable material cost limit standard

机组编号	火电机组容量等级	限额/ (元·(MW·h)^–1)	先进值/ (元·(MW·h)^–1)
1	300≤P＜600	1.45	1.05
2	600≤P＜1000	1.25	0.75
3	P≥1000	1.00	—

Table 5 Unit operation cost parameter setting

参数		设定值
煤价/(元·t^–1)		547.87
耗水率/(kg·(kW·h)^–1)		1.30
水价/(元·m^–3)		4.86
环保税率/(元·(污染当量)^–1)		1.80
NO_x单位排放量/(g·(kW·h)^–1)		0.36
烟尘单位排放量/(g·(kW·h)^–1)		0.08
SO₂单位排放量/(g·(kW·h)^–1)		0.39

Fig.7 Bid curve of Unit 1 (300 MW)

Fig.8 Bid curve of Unit 2 (600 MW)

Fig.9 Bid curve of Unit 3 (1000 MW)

Fig.10 Unit scheduling sequence and average quotation under different scenarios

Fig.11 Clearance of coal-fired power units and grid electricity price under wind and light conditions in summer

Fig.12 Carbon emission costs under different carbon scenarios

Fig.13 Unit bid curves under different carbon scenarios

Fig.14 Clearing situation and electricity price of coal-fired power units under wind and light conditions in summer

Fig.15 Clearing situation and electricity price of coal-fired power units under the situation of no wind and no light in summer

Table 6 Total carbon market revenue and cost of the unit

情景	碳市场总收入/万元
情景	3号机组	2号机组	1号机组
轻度碳市场	4.86	–0.60	–0.09
中度碳市场	–55.99	–31.19	–4.68
重度碳市场	–192.56	–100.18	–15.30

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