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Control strategy for hardware simplification of voltage source converter-based power applications

机译:基于电压源转换器的电源应用的硬件简化控制策略

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摘要

A hardware simplification control strategy for three-phase voltage-source-converter-based power applications is presented. The main goal of the proposal is to reduce the number of sensors needed to implement the controller while maintaining the high performance of the system. To this end, ac-voltage and dc-current sensors are replaced by software sensors based on state observers. Consequently, a more rugged, smaller and cheaper realisation can be accomplished. Regarding the voltage source converter controller, an energy function and the reactive power of the converter are considered as outputs for constructing a feedback law based on the feedback linearisation technique. In this way, internal dynamics is avoided. In order to improve controller performance, estimates of the load power and its time derivative are feedforwarded. The ac-voltages and load power estimates are obtained by designing a reduced-order nonlinear observer. Several tests, with a realistic voltage source converter model that takes into account the switching power devices, validate the proposed technique. They evaluate the system performance in the presence of parameter uncertainties and disturbances in the AC input voltage.
机译:提出了一种基于三相电压源转换器的电源应用的硬件简化控制策略。该提案的主要目标是减少实现控制器所需的传感器数量,同时保持系统的高性能。为此,交流电压和直流电流传感器被基于状态观察器的软件传感器所取代。因此,可以实现更坚固,更小和更便宜的实现。关于电压源转换器控制器,转换器的能量函数和无功功率被认为是用于基于反馈线性化技术构建反馈律的输出。这样,避免了内部动力学。为了提高控制器性能,将负载功率及其时间导数的估计值进行前馈。通过设计降阶非线性观测器可以获得交流电压和负载功率估计值。在考虑了开关电源设备的情况下,采用实际电压源转换器模型进行的多项测试验证了所提出的技术。他们在参数不确定性和交流输入电压存在干扰的情况下评估系统性能。

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  • 来源
    《Power Electronics, IET》 |2011年第1期|p.39-50|共12页
  • 作者单位

    Instituto de Investigaciones en Ingenieria Electrica (IIIE) 'Alfredo Desages', Departamento de Ingenieria Electrica y de Computadoras, Universidad Nacional del Sur (UNS), 1253 Alem Avenue, Bahia Blanca, P.O. 8000, Argentina;

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