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Under the background of “dual-carbon” goal, the combined heat and power units with once through boilers are required to have the ability to quickly change load. To address this need, a strategy based on linear time-varying model predictive control (LTV-MPC) for coordinating electricity and heat to change unit load is proposed, which can simultaneously utilize boiler heat storage and heat network heat storage to improve the rate of variable load. Firstly, the deviation of the heat load signal is integrated to establish an equivalent heat load model, which is used as one of the controlled variables in the prediction model. Then, by taking rapid load tracking, stable unit operation, and timely compensation for heating as the objective of MPC rolling optimization, the optimal control law for each moment is solved online, and then it is applied to the unit. In addition, the operational constraints of the unit are explicitly addressed to ensure that changes in the heating extraction flow rate do not affect the operational stability of the low-pressure cylinder. Finally, simulation verification is conducted on a 350 MW unit, and the results show that this strategy can accurately track the 5%Pe/min variable load command. Furthermore, the heat load recovery time is reduced by 26% compared with that of the electric heating coordinated variable load strategy based on PID. The simulation results have verified the superiority of the proposed strategy in improving the fast load changing capacity of heating units.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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