部分转矩通过模型预测控制

T. Besselmann, Pieder Jorg, Terje Knutsen, E. Lunde, Tor O. Stava, Sture Van de moortel
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引用次数: 11

摘要

电网电压的对称和不对称下降对由负载换向逆变器(LCI)等驱动的气体压缩站造成了严重的问题。工业实践中使用的驱动控制系统不能适当地处理电网电压降低的情况,并且在驱动器不提供驱动扭矩的情况下执行穿越程序。如果没有驱动扭矩,压缩机可能会迅速进入喘振状态,在这种情况下,气体会快速来回流动,造成磨损,并有可能损坏设备。本文提出了一种基于模型预测控制(MPC)的负载换相逆变器控制方法。模型预测控制是一种基于优化的控制方法,它利用系统的数学模型来确定相对于某个目标函数的最优控制输入。通过改进的控制系统,驱动器能够在电网扰动时提供部分驱动扭矩;从而提高了电动气体压缩站的稳健性。在电压下降的情况下,压缩机仍然有部分驱动转矩,减少了压缩机发散为喘振的可能性。本文包括在两台实际的41.2 MW lci同步电机上运行的实验结果,每台同步电机为一台气体压缩机供电。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Partial torque ride through with model predictive control
Symmetric and asymmetric dips of the grid voltage pose serious problems to gas compression stations powered by drives such as load commutated inverters (LCI). Drive control systems used in industrial practice are not capable to handle reduced grid voltage situations appropriately, and execute a ride-through procedure instead during which no drive torque is provided by the drive. Without drive torque compressors may quickly enter surge conditions, under which the gas flows rapidly back and forth, causing wear and risking damage to the equipment. In this paper we describe a novel control approach developed for load commutated inverters based on model predictive control (MPC). Model predictive control is an optimization-based control method, where a mathematical model of the system is used to determine control inputs which are optimal with respect to some objective function. With the revised control system, the drive is capable to provide partial drive torque during grid disturbances; thus resulting in robustness improvements for electrically-driven gas compression stations. In the case of a voltage dip, the compressor is still supplied with partial drive torque, decreasing the probability of the compressor diverging into surge. The paper includes experimental results executed on two real 41.2 MW LCI-fed synchronous machines each powering a gas compressor.
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