【作者】 杨丽；

【导师】 赵晓君；

【作者基本信息】 燕山大学 ， 电气工程， 2023， 硕士

【摘要】 随着分布式能源向电网的高比例渗透,电网中的能量流动与控制将更为复杂,而以单方向辐射状供电的传统电网难以应对当前多能源互联互通的发展趋势。电能路由器不仅可以满足多种分布式装置的接入需求,还能够对多能源能量流进行主动控制与管理。本文面向低压配电网应用场景,在所构建的串并联架构电能路由器(Series-Parallel Architecture Electric Power Router,SPA-EPR)基础上,分别对其拓扑架构、工作原理以及控制策略等方面开展研究,主要研究内容如下:首先,分析了SPA-EPR系统的拓扑架构。对比研究了SPA-EPR相较于传统串联型电能路由器的优势,其可在不增加路由器自身额定容量的前提下将系统的功率传输范围提升至200%。推导了系统各变换器的数学模型,并结合系统的工作原理,给出了各变换器的基本控制原理,通过仿真验证了SPA-EPR系统的基本运行功能。其次,对SPA-EPR系统运行机理进行了分析。考虑SPA-EPR所具备的并网和孤岛场景下的多种模式运行特征,本文研究了柔性运行模式、直流母线运行模式和光伏电池联合运行模式等多模式运行机制。针对并网场景下系统有功功率无法柔性调节的问题,通过引入有功功率自由度k_p,实现了灵活配置交流电网与直流母线之间的有功功率,增强了系统能量交互的灵活性。然后,针对系统能量无法优化运行的问题,为实现不同运行模式间的能量优化配置,本文以系统内部各变换器额定容量为约束条件,在充分考虑分布式电源和电池状态的条件下,设计了以最大化利用新能源为目标的能量优化运行原则,进而提出了一种基于能量优化的多模式协调控制策略,可实现系统在不同工况下自主选择运行模式以及不同运行模式间无缝切换的目标。同时,通过仿真结果验证了所提多模式协调控制策略的有效性。最后,搭建了基于TMS320F28335控制芯片的Star Sim HIL硬件在环实验平台,对路由器在并网、孤岛场景下的多模式运行与切换及并网-孤岛场景切换进行了实验验证,实验结果验证了本文所提多模式协调控制策略的合理性与有效性。更多还原

【Abstract】 With the high penetration of distributed energy into the power grid,the energy flow and control in the power grid will be more complicated,and the traditional power grid with unidirectional radial power supply is difficult to cope with the current development trend of multi-energy interconnection.The electric energy router can not only meet the access requirements of various distributed devices,but also can actively control and manage the multi-energy energy flow.This paper focuses on the application scenarios of low-voltage distribution networks and conducts research on the topology,working principles,and control strategies of the Series-Parallel Architecture Electric Power Router(SPA-EPR)constructed.The main research contents are as follows:Firstly,the topology architecture of the SPA-EPR system was analyzed.A comparative study was conducted on the advantages of SPA-EPR compared to traditional series electric power routers,which can increase the power transmission range of the system to 200%without increasing the rated capacity of the router itself.The mathematical models of each converter in the system were derived,and the basic control principles of each converter were given based on the working principle of the system.The basic operating functions of the SPA-EPR system were verified through simulation.Secondly,the operational mechanism of the SPA-EPR system was analyzed.Considering the multiple mode operation characteristics of SPA-EPR in grid connected and isolated scenarios,this paper studies multiple mode operation mechanisms such as flexible operation mode,DC bus operation mode,and PV and battery combined operation mode.To address the issue of the inability to flexibly adjust the active power of the system in grid connected scenarios,the introduction of the active power degree of freedom k_penables flexible configuration of the active power between the AC power grid and the DC bus,enhancing the flexibility of system energy interaction.Thirdly,aiming at the problem that the system energy cannot be optimized,in order to realize the energy optimization configuration between different operation modes,this paper takes the rated capacity of each converter in the system as the constraint condition,and designs the energy optimization operation principle with the goal of maximizing the utilization of new energy under the condition of fully considering the distributed power supply and battery state.Then,a multimode coordinated control strategy based on energy optimization is proposed,which can realize the goal of autonomous selection of operation mode and seamless switching between different operation modes under different working conditions.At the same time,the effectiveness of the proposed multimode coordinated control strategy is verified by simulation results.Finally,a Star Sim HIL hardware in the loop experimental platform based on the TMS320F28335 control chip was built to verify the multimode operation and switching of routers in grid connected and island scenarios,as well as grid connected and island scenario switching.The experimental results verified the rationality and effectiveness of the multimode coordinated control strategy proposed in this paper.更多还原