Syntheses and Analyses of Control Structure for Coal-fired Power Plants Oriented to Renewable Energy Accommodation
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摘要: 增加可再生能源在电网中的占比, 使能源结构更合理, 是加快能源转型实现低碳可持续发展的有效途径. 电网中占主导地位的火电, 辅助消纳可再生能源的能力, 对提高可再生能源在电网中的占比起到重要作用. 为了提高火电机组辅助可再生能源的消纳能力, 本文根据当前系统控制方案, 分析了影响机组灵活性与调峰深度的因素, 包括机炉协调、局部反馈策略下的锅炉控制、系统稳态工作点的规划等. 基于补偿方案的协调策略限制了机组对具有随机性和间歇性的可再生能源的补偿能力; 局部反馈策略下的锅炉控制只是实现了等效热效应的反馈; 非额定工况下的稳态工作点关系到辅助可再生能源消纳的能耗和排放指标. 根据以上分析分别给出了进一步的研究内容.Abstract: In order to optimize the energy structure to realize sustainable development, increasing the proportion of renewable energy in power grid is inevitable. The cooperative capability of coal-fired units, which are primary of national grid, is the issue. For the sake of improving this capability, this paper analysed factors which affect flexibility and depth of peak-shaving, based on control scheme. The factors include coordinating turbine and furnace, fuel control based on local feedback, programming steady operating point. Coordinating scheme which was based on compensating networks, restricts the ability of constraining renewable energy which is random and intermittent. It was thermal effect of the fired coal compared with standard coal that the furnace burning was fed back regardless of other burning characters. Steady operating points of the system were related to energy cost and emission when the system did not work in rated condition.The paper proposed further research based on these conclusions.
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表 1 性能参数对比
Table 1 Comparision of performance parameters
参数 我国 欧洲 单位 负荷变动速率 2/1.5 6/4 %/min 硬煤/褐煤 最小出力 35/50 20/40 % 硬煤/褐煤 冷态启动时间 8/12 4/6 h 硬煤/褐煤 热态启动时间 4 2 h 
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