为深入研究耦合太阳能对燃机动态特性的影响,建立耦合太阳能的燃气轮机以及相应控制系统的动态模型。分析槽式集热器不同耦合方式对系统稳态性能的影响以及受到外界负荷及太阳直射辐射（DNI）扰动时各参数的动态响应,研究槽式集热器金属热容对系统动态特性的影响,针对比例积分（PI）控制,研究相应参数对系统调节效果的影响。结果表明,采用集热器布置在回热器前时,系统的排气温度相对较高,但系统效率会相对较低,受到外界负荷扰动时,系统响应更加迅速,采用集热器布置在回热器后时则可得到更高的燃料节省量;DNI变化时2种方式的系统响应速度相同;当集热器金属热容较小时,系统的响应时间主要受控制系统及回热器惯性影响,随着热容增加,调节集热器惯性参数为改变系统动态响应时间的最有效方式;比例系数Kp与积分系数Ki应合理选取,过大或过小均会使系统失调的危险性提高。
Abstract
In order to further study the influence of coupled solar energy on the dynamic characteristics of gas turbines, a dynamic model of the gas turbine coupled with solar energy and the corresponding control system was established. The influence of different coupling modes of trough collectors on the steady-state performance of the system and the dynamic response of various parameters when subjected to external load and DNI disturbance are analyzed. The influence of the metal heat capacity of the trough collector on the dynamic characteristics of the system is studied. At the same time, aiming at the proportion-integration（PI） control, the influence of the corresponding parameters on the system regulation effect is studied. The results show that when the collector is arranged in front of the regenerator, the exhaust temperature of the system is relatively high, but the efficiency of the system is relatively low. When disturbed by external load, the system responds more quickly. When the collector is arranged behind the regenerator, the fuel consumption is lower. The system response speed of the two methods is the same when it is disturbed by DNI. When the heat capacity of the collector metal is small, the response time of the system is mainly affected by the inertia of the control system and the regenerator. As the heat capacity increases, adjusting the inertia parameters of the collector is the most effective way to change the dynamic response time of the system, Both the proportional coefficient Kp and the integral coefficient Ki should be selected reasonably, too large or too small value will increase the risk of system imbalance.
关键词
太阳能集热器 /
燃气轮机 /
动态模型 /
控制系统
Key words
solar collectors /
gas turbines /
dynamic models /
control systems
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基金
国家电网有限公司总部科技项目资助-基于储能调控的柔性可控分布式系统理论与技术（5100-202199531A-0-5-ZN）
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