Nonlinear control strategies for cascaded multilevel STATCOMs
Nonlinear control strategies for cascaded multilevel STATCOMs
复制标题
DOI：
10.1109/tpwrd.2004.835394
复制
发表时间：
2004-10
影响因子：
4.4
通讯作者：
D. Soto;R. Peña
中科院分区：
文献类型：
--
作者：
D. Soto;R. Peña
针对级联多电平静态补偿器，提出了两种基于反馈线性化技术的内部非线性控制策略。该策略依赖于变换器输出电压的控制能力，适用于线频开关变换器。第一种策略考虑的是一个STATCOM，其中电压的设置独立于直流链路电压。实现了亚周期时间响应内的快速无功控制。第二种策略被限制为其幅值保持与直流链路电压成比例的电压。尽管存在这种限制，但所提出的策略可以完全稳定STATCOM动态并相对快速地控制无功电流（在一个周期内）。这对于大多数STATCOM应用来说是足够的。利用电力系统计算机辅助设计/电磁暂态程序（PSCAD/EMTP）对这两种策略进行了仿真，验证了控制方案施加线性STATCOM动态的有效性。给出了固定控制角变换器五电平样机的初步实验结果。
Two internal nonlinear control strategies based on the feedback linearization technique for cascaded multilevel static compensators (STATCOMs) are presented. The strategies depend on the control capability of the converter output voltage and are suitable for line frequency-switched converters. The first strategy considers a STATCOM where the voltage is set independently of the dc link voltage. Fast reactive power control within subcycle time response is achieved. The second strategy is constrained to a voltage whose amplitude remains proportional to the dc link voltage. Despite this limitation, the proposed strategy allows full stabilization of the STATCOM dynamics and relatively fast control of the reactive current (within one cycle). This may be adequate for most STATCOM applications. Simulation results, using power system computer-aided design/electromagnetic transient program (PSCAD/EMTP), presented for both strategies confirm the effectiveness of the control schemes to impose linear STATCOM dynamics. Preliminary experimental results from a five-level prototype are presented for a converter using fixed control angles.