Research on variable condition control of power systems with large delay characteristics

含大延迟特性循环动力系统变工况控制研究

¹ School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an 710072, China
² The 705 Research Institute, China State Shipbuilding Co., Ltd., Xi'an 710077, China

Received: 26 April 2024

Abstract

A variable operating condition control strategy based on a combination of open-loop and closed-loop is proposed to address the challenge of variable operating condition control for Li/SF₆ closed cycle power systems containing immersed combustion boiler reactors with large delay characteristics. This article establishes dynamic models of submerged combustion boiler reactors, spiral tube evaporators, turbines, shell and tube condensers, and liquid collectors. The one-dimensional distributed parameter model of spiral tube evaporators and the concentrated parameter model of submerged combustion boiler reactors are respectively verified, and the accuracy of the models is verified. Two SF₆ flow regulation methods were proposed, namely step regulation and slope regulation, and simulations were conducted to analyze the variation patterns of working fluid temperature, flow rate and pressure at the evaporator outlet, boiler reactor temperature, and pump water supply flow parameters during variable operating conditions. The results showed that during the variable operating conditions of the system, the changes in various parameters were stable; Under the same turbine speed regulation amplitude, slope regulation of SF₆ flow rate reduces the time consumption of the variable operating condition process compared to step regulation. The research results can provide theoretical reference for the design of power systems for future underwater vehicles.

摘要

针对包含具有大延迟特性浸没燃烧锅炉反应器的Li/SF₆闭式循环动力系统变工况控制难题, 提出了基于开环与闭环相结合的系统变工况控制策略。建立了浸没燃烧锅炉反应器、螺旋管蒸发器、涡轮机、管壳式冷凝器和集液器的动态模型, 分别对螺旋管蒸发器的一维分布参数模型和浸没燃烧锅炉反应器的集中参数模型进行了模型验证, 验证了模型的准确性。给出了2种SF₆流量调节方法, 即阶跃调节和斜坡调节, 分别进行仿真, 分析了变工况过程中蒸发器出口工质温度、流量和压力、锅炉反应器温度以及泵供水流量参数变化规律, 结果表明: 系统变工况过程中, 各参数变化稳定; 在相同的涡轮机转速调节幅度下, 斜坡调节SF₆流量使变工况过程耗时低于阶跃调节。研究结果可为未来水下航行器动力系统的设计提供理论参考。