A New Power Conversion System for Megawatt PMSG Wind Turbines Using Four-Level Converters and a Simple Control Scheme Based on Two-Step Model Predictive Strategy—Part I: Modeling and Theoretical Analysis
A New Power Conversion System for Megawatt PMSG Wind Turbines Using Four-Level Converters and a Simple Control Scheme Based on Two-Step Model Predictive Strategy—Part I: Modeling and Theoretical Analysis
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DOI：
10.1109/jestpe.2013.2294920
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发表时间：
2014-03
影响因子：
5.5
通讯作者：
V. Yaramasu;Bin Wu;M. Rivera;José R. Rodríguez
中科院分区：
文献类型：
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作者：
V. Yaramasu;Bin Wu;M. Rivera;José R. Rodríguez
本文针对兆瓦级风力发电机组，探索了一种新的功率转换系统。提出的配置包括一个中压，永磁同步发电机连接到一个低成本的三相二极管桥式整流器，一个dc-dc四电平升压转换器作为中间级，和一个四电平二极管箝位逆变器在电网侧。直流电容电压由升压变换器平衡，大大简化了并网逆变器的控制复杂度。针对升压变换器和并网逆变器的控制问题，提出了一种基于两步模型预测策略的简单控制方法。在本文的第一部分，分析了所提出的功率转换系统的连续时间和离散时间建模。控制器的设计考虑了最大功率点跟踪、直流链路电容电压平衡、直流母线净电压调节、无功发电、低开关频率运行和共模电压最小化等控制目标。
A new power conversion system is explored in this paper aiming wind turbines rated at the megawatt level. The proposed configuration consists of a medium-voltage, permanent magnet synchronous generator connected to a low-cost three-phase diode bridge rectifier, a dc-dc four-level boost converter as the intermediate stage, and a four-level diode-clamped inverter on the grid-side. The dc-link capacitor voltages are balanced by the boost converter, and thus the control complexity for the grid-tied inverter is greatly simplified. To control the boost converter and grid-tied inverter, a simple method based on a two-step model predictive strategy is presented. In the first part of this paper, the continuous- and discrete-time modeling of the proposed power conversion system is analyzed. The control objectives such as maximum power point tracking, dc-link capacitor voltages balancing, regulation of net dc-bus voltage, reactive power generation, lower switching frequency operation, and common-mode voltage minimization are considered in the design of controller.