Control design of power electronic interfaces for optimal performance of renewable energy systems

目的：研究蓄电池/超级电容器混合储能可再生能源系统中电力电子接口的先进非线性控制设计方法。将利用多个功率转换器来协调电池、超级电容器、负载、公用电网和/或可再生能源之间的能量流动。将开发有效的模型来真实地描述复杂的非线性动力学。基于这些模型，将为高效、可靠和持久的能源系统设计非线性控制策略。智能优点：具有脉宽调制转换器的电力系统本质上是非线性的，并且受到严格的输入/状态约束和各种不确定性的约束。对于具有混合储能设备和多个功率转换器的系统来说，动力学要复杂得多。现有的方法大多采用线性化模型，忽略了约束条件。该项目将建立可靠和易于处理的非线性模型，应用先进的非线性系统技术，并开发新的理论和计算工具来设计所有涉及的电力电子接口的控制律。设计考虑的因素包括电池的安全充放电电流/电压、稳定性、暂态动态、功率因数、总谐波失真、纹波减小等。将构建实验系统来验证设计方法。更广泛的影响：该项目开发的控制设计方法将帮助电力和能源行业构建效率更高、可靠性更高、寿命更长、成本更低的可再生能源系统。研究成果将在电力和能源界以及控制系统界的出版物中传播。本科生和研究生将接受培训，以构建各种功率转换器，设计和实施反馈规律，以实现最佳性能。他们将参与一个具有多个电力电子接口的实验太阳系的建设。一名女学生和一名非裔美国学生将参与该项目。他们将被培训为电力和能源行业的生产力。

Objective: The objective of this project is to develop advanced nonlinear control design methodologies for power electronic interfaces in renewable energy systems with battery/supercapacitor hybrid energy storage. Multiple power converters will be utilized to coordinate the energy flow between the batteries, the supercapacitors, the load, the utility grid and/or the renewable energy sources. Efficient models will be developed to faithfully describe the complex nonlinear dynamics. Based on these models, nonlinear control strategies will be designed for highly efficient, reliable and long lasting energy systems. Intellectual Merits: Power systems with pulse-width-modulated converters are intrinsically nonlinear, and subject to strict input/state constraints and various uncertainties. For systems with hybrid energy storage devices and multiple power converters, the dynamics is more complex. Most existing methods use linearized models and neglect the constraints. This project will develop faithful and tractable nonlinear models, apply advanced nonlinear systems techniques, and develop new theoretical and computational tools for the design of control laws for all the power electronic interfaces involved. Design considerations include safe charging/discharging current/voltage for the batteries, stability, transient dynamics, power factor, total harmonic distortion, ripple reduction, etc. Experimental systems will be constructed to validate the design methods. Broader Impact: Control design methodologies developed in this project will help the power and energy industry to construct renewable energy systems with improved efficiency, reliability, longer lifetime and lower cost. The research results will be disseminated in publications in power and energy communities as well as in control systems community. Undergraduate and graduate students will be trained to construct various power converters, to design and implement feedback laws for optimal performances. They will be involved in the construction of an experimental solar system, with multiple power electronic interfaces. One female student and one African American student will be working on the project. They will be trained as productive forces for the power and energy industry.