摘 要
近年来，光伏发电与储能技术的迅速发展，对能源转型具有重要的促进作用。其中，光伏储能系统中的 DC/DC 变换器起到了关键作用。本文针对现有的光伏储能系统中存在的问题，探讨了交错并联型光伏储能双向 DC/DC 变换器的设计与实现。首先，分析了现有光伏储能系统在储能方面存在的问题，进而提出了交错并联型光伏储能双向 DC/DC 变换器的设计思路。随后，详细阐述了变换器的电路结构、控制策略等主要设计内容，并对其进行了仿真验证。最后，利用实验样机对交错并联型光伏储能双向 DC/DC 变换器的性能进行了测试与分析。研究结果表明，所设计的交错并联型光伏储能双向 DC/DC 变换器具有较好的性能，能够有效解决光伏储能系统中的问题，具有一定的实用价值。
关键词：光伏储能、 DC/DC 变换器、交错并联、双向转换、控制策略、仿真验证、实验测试
东安黑豹ABSTRACT
In recent years，the rapid development of photovoltaic power generation and energy storage technology has played an important role in energy transformation. Among them, the DC/DC converter in photovoltaic energy storage system plays a key role. In this study, we discuss the design and implementation of a bidirectional DC/DC converter in a photovoltaic energy storage system. Firstly, we analyze the problems existing in the current photovoltaic energy storage system, and then propose the design idea of the bidirectional DC/DC converter in photovoltaic energy storage system. After that, the main design content such as the circuit structure and control strategy of the converter are elaborated in detail, and verified by simulation. Finally, the performance of the converter is tested and analyzed by using the experimental prototype. The experimental results show that the designed bidirectional DC/DC converter has good performance, and can effectively solve the problems in the photovoltaic energy storage system, which has certain practical value.
咏春传奇电视剧Keywords: Photovoltaic Energy Storage, DC/DC Converter, Interleaved Parallel, Bidirectional Conversion, Control Strategy, Simulation Verification, Experimental Tes
Introduction
Photovoltaic (PV) energy has become an important renewable energy source due to its advantages of cleanliness, safety, and sustainability. However, the fluctuation of solar irradiation and the intermittence of PV power output directly affect the stability and reliability of power systems. Energy storage systems (ESS) have been widely used to solve the problems caused by the fluctuations and intermittence of PV power output. Bidirectional DC/DC converters are essential components in PV energy storage systems, as they can effectively manage the power flow between the PV arrays and energy storage devices.
甲氨磷
In recent years, interleaved parallel bidirectional DC/DC converters have attracted considerable attention due to their advantages of high input and output voltage range, high efficiency, and low electromagnetic interference (EMI). This type of converter can provide a higher power density while maintaining a small size and low cost. However, the control strategy of interleaved parallel bidirectional DC/DC converters is complex, and the 康涅狄格州百人误诊
interaction between the current ripple and EMI is strong, which makes it challenging to design a stable and reliable converter.
互教通
In this study, a novel interleaved parallel bidirectional DC/DC converter for PV energy storage systems is proposed. The converter adopts a dual-loop control strategy to improve the dynamic performance of the system. A simulation model of the proposed converter is established, and the validity of the model is verified by simulation. An experimental prototype of the converter is also built, and the performance of the converter is tested and analyzed by using the experimental prototype.
Interleaved Parallel Bidirectional DC/DC Converter for PV Energy Storage Systems
The proposed interleaved parallel bidirectional DC/DC converter consists of two bidirectional buck-boost converters connected in parallel (see Figure 1). The two converters operate in parallel to share the total output current, reducing the current ripple and EMI. An inductor and a capacitor are added between the two parallel converters to filter out the high-frequency noise generated during the conversion process.
The converter has two modes of operation: the charging mode and discharging mode. In the charging mode, the energy from the PV array is converted into a suitable voltage and current for charging the energy storage device. In the discharging mode, the energy stored in the energy storage device is converted into a suitable voltage and current for feeding the load.两河文明
To improve the dynamic performance of the system, a dual-loop control strategy based on the conventional PI control is proposed. In the outer loop, the voltage of the energy storage device is controlled by adjusting the duty cycle of the converter. In the inner loop, the current flowing through the inductor is controlled by adjusting the current reference value. A voltage and current double-loop decoupling control method is used to reduce the coupling effect between the two loops and improve the control accuracy of the system.
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