基于机电耦合双端模拟的AC-DC接口变换器控制研究

AC-DC interlinking converter (ILC) is the power conversion hub of AC/DC hybrid distribution network, and its operation control faces three key performance requirements at the same time: a) improving the operation stability of the distribution network; b) improving the adaptability to multiple operation modes of the distribution network; c) reducing the complexity of control strategies. However, in the existing control strategies, there are many and complicated specialized control loops, which makes it difficult to meet the requirements of stability and mode adaptability simultaneously. In addition, considering the requirement of simplification, it is even more difficult to implement, that is, the research on new integrated control strategies for ILC faces technological dilemma of the route. The applicant found after careful consideration that the back-to-back towing motors have outstanding features required for the ILC: 1) stable operation; 2) adapting to various power supply modes to ensure the maintenance of the bus voltages on both sides; 3) the structure is relatively simple. However, this internal connection between the ILC and the back-to-back towing motors has not been studied and utilized. This research project will explore a new path, and propose a control theory that makes ILC directly imitate the dual-port characteristics of the back-to-back towing motors, so that the ILC and its control system can obtain the above-mentioned features of the back-to-back towing motors, break through the technological dilemma of the route, and open up a practical route for the research on the control optimization of ILC.

AC-DC接口变换器（Interlinking Converter, ILC）是交直流混合配电网的功率变换枢纽，其运行控制同时面临三方面的关键性能需求：a) 提升配电网运行稳定性；b) 提高对配电网多种运行模式的适应性；c) 降低控制策略复杂度。然而现有控制策略中，专门的控制环路多且复杂，导致难以同时满足稳定性和模式适应性要求，再考虑简化需求，则更难实现，即针对ILC的新型综合控制策略研究面临技术路线困境。申请人经过深思熟虑发现，对拖电机具有ILC所需的突出优势特性： 1) 运行稳定； 2) 适应各种供电模式，可保证两侧母线电压的维持；3) 结构比较简单。但ILC与对拖电机的这种内在联系未被研究和利用。本申请项目将另辟蹊径，探索提出ILC直接模拟对拖电机双端口特性的控制理论方法，以使ILC获得对拖电机的上述优势特性，突破路线困境，为ILC的优化控制研究开辟一条颇具实用潜力的崭新思路。

AC-DC接口变换器（Interlinking Converter, ILC）是交直流混合配电网的功率变换枢纽，其运行控制同时面临三方面的关键性能需求：a) 提升配电网运行稳定性；b) 提高对配电网多种运行模式的适应性；c) 降低控制策略复杂度。然而现有控制策略中，专门的控制环路多且复杂，导致难以同时满足稳定性和模式适应性要求，再考虑简化需求，则更难实现，即针对ILC的新型综合控制策略研究面临技术路线困境。传统对拖电机具有ILC所需的突出优势特性： 1) 运行稳定； 2) 适应各种供电模式，可保证两侧母线电压的维持；3) 结构较为简单。本项目工作研究了ILC与对拖电机的内在联系，揭示了直流电压和交流频率间的同质关系，据此提出了ILC直接模拟对拖电机双端口特性的控制理论。提出的控制策略作为一种统一控制策略，适应ILC交流与直流侧并离网模式的变化，无需交流侧电压或电流采样，可极大降低ILC的控制复杂度，提高其控制系统可靠性。这种控制方式不需要功频下垂关系或锁相环，为ILC的优化控制研究开辟了一条颇具实用潜力的崭新思路。