Structural modeling of existing and improved control algorithms for thyristor switching devices of uninterruptible power supply units for auxiliary needs of nuclear power plants

IF 0.4 Q4 MATHEMATICS, APPLIED
V. Rozhkov, V. V. Fedotov, K. Krutikov, S. G. Butrimov
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引用次数: 0

Abstract

The article analyzes the operation of thyristor automatic switching devices for uninterruptible power supply units of nuclear power plants. They are part of the emergency power supply system for auxiliary electrical equipment with a rated voltage of 0.4 kV. In such a reliable power supply system for especially responsible consumers, alternative networks and backup sources are necessarily used. Typically, groups of consumers for auxiliary needs of nuclear power plants are powered from the inverter network, so that in the event of a shutdown of the backup bypass network, these loads continue to be powered by the uninterruptible power supply unit. It incorporates a charger – a controlled rectifier, a battery pack and a transistor inverter. The transition from one network to another in any direction must be “shockless” in order to avoid the operation of the protections of uninterruptible power units and other electrical protections of the reliable power supply system. If there are failures in the algorithms or their irrational organization, the processes of transition between networks may be accompanied by a violation of uninterrupted power supply or phase-to-phase short circuits. A structural simulation model has been created in the MatLab computer mathematics system for testing transition algorithms for various phase shifts of networks and transition directions. The algorithm of transition between networks for uninterruptible power units of one of the manufacturing companies that supplied equipment to nuclear power plants was analyzed. A safer optimal algorithm for controlling network switching with phase-by-phase control of the current drop in the disconnected network is proposed. The proposals are supported by the results of computer simulations.
核电厂辅助用不间断电源晶闸管开关装置现有及改进控制算法的结构建模
分析了核电站不间断电源机组晶闸管自动开关装置的运行情况。它是辅助电气设备应急供电系统的一部分,额定电压为0.4 kV。在这样一个可靠的电力供应系统中,对于特别负责任的消费者,必须使用替代网络和备用电源。通常情况下,用于核电厂辅助需求的用户群由逆变器网络供电,以便在备用旁路网络关闭的情况下,这些负载继续由不间断电源单元供电。它包括一个充电器、一个可控整流器、一个电池组和一个晶体管逆变器。从一个网络到另一个网络的任何方向的过渡都必须是“无冲击”的,以避免不间断电源单元保护和可靠供电系统的其他电气保护的运行。如果算法存在故障或其组织不合理,则网络间过渡过程中可能会出现不间断供电或相间短路的情况。在MatLab计算机数学系统中建立了结构仿真模型,用于测试各种网络相移和过渡方向的过渡算法。分析了某核电设备制造企业不间断机组的网络切换算法。提出了一种更安全的控制网络切换的最优算法,对断开网络中的电流降进行逐相控制。这些建议得到了计算机模拟结果的支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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CiteScore
0.70
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0.00%
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