随着近年来可持续发展战略政策的提出，国家大力支持发展可再生能源使用技术以及实现化石能源的清洁使用进而减小对传统一次能源过度消费所导致的环境污染等问题。逆变器是可再生能源和化石能源转换为电力资源不可或缺的核心环节，在光伏发电、风力发电、新能源电动汽车、UPS电源、储能等领域有广泛的应用场景。为了提高逆变电源效率和输出电能质量，本文设计了一款串联谐振两级式隔离逆变电源，并展开如下研究工作：

由于谐振回路中谐振元件的存在，谐振变换器的输出特性往往具有较强的非线性，谐振元件参数的设计一直是研究的重点。本文对SRC推挽电路在DCM、CCM1以及CCM2模式分别进行时域分析，得出谐振电压电流表达式，根据功率守恒计算得出工作在CRM1和CRM2工作模式一种新的谐振元件参数优化设计方法，并对谐振回路特性进行分析，阐明了电路品质因数及工作频率与谐振频率比对系统的影响，所设计出来的SRC推挽升压电路降低了电源损耗，提高了电源功率密度。对两级电路母线二倍工频纹波产生的原因及危害进行研究，提出一种调制波重构非线性前馈控制策略来降低母线二倍工频纹波对输出电压THD的影响，并对比分析了PI控制和PR控制应用于逆变电路存在的问题，并设计出一种适用于逆变电路场合的准PR控制器，对控制器的参数进行了详细计算，该控制器对逆变电源输出电能质量的提高存在明显优势。

根据技术指标设计了基于串联谐振两级式隔离逆变电源实验样机并搭建了相应的实验平台，实验结果表明：本文所提出谐振参数设计方法所设计的推挽升压电路可以实现较好的软开关效果，电源峰值效率可提升5%，由于实现软开关而去除厚重散热片可降低电源40%的体积，极大地提高了电源功率密度。本文所提出的调制波重构非线性前馈控制策略在500W负载测试中相比于传统控制策略输出THD降低了0.6%，可有效提高输出电能质量，验证了理论分析的正确性及控制策略的有效性。

With the proposal of sustainable development strategy and policy in recent years, the state strongly supports the development of renewable energy use technology and the realization of clean use of fossil energy to reduce environmental pollution caused by excessive consumption of traditional primary energy. Inverters are an indispensable core link in the conversion of renewable and fossil energy into electricity resources, and have a wide range of application scenarios in fields such as photovoltaic power generation, wind power generation, new energy electric vehicles, UPS power supply, energy storage, etc. In order to improve the efficiency and output power quality of the inverter power supply, this paper designs a series resonant two-stage isolated inverter power supply and conducts the following research work:

Due to the presence of resonant components in the resonant circuit, the output characteristics of resonant converters often have strong nonlinearity, and the design of resonant component parameters has always been a focus of research. This article conducts time-domain analysis on the SRC push-pull circuit in DCM, CCM1, and CCM2 modes, and obtains the expression of resonant voltage and current. Based on power conservation calculation, a new optimization design method for resonant component parameters operating in CRM1 and CRM2 operating modes is obtained. The characteristics of the resonant circuit are analyzed, and the influence of circuit quality factor and the ratio of operating frequency to resonant frequency on the system is elucidated, The designed SRC push-pull boost circuit reduces power loss and improves power density. A study was conducted on the causes and hazards of double power frequency ripple on the bus of two-stage circuits. A modulation wave reconstruction nonlinear feedforward control strategy was proposed to reduce the impact of double power frequency ripple on the output voltage THD. The problems of PI control and PR control applied to inverter circuits were compared and analyzed. A quasi PR controller suitable for inverter circuit applications was designed, and the parameters of the controller were calculated in detail, This controller has obvious advantages in improving the output power quality of the inverter power supply.

Finally, an experimental prototype of a two-stage isolation inverter power supply based on series resonance was designed according to the technical specifications and a corresponding experimental platform was built. The experimental results showed that the push-pull boost circuit designed using the resonance parameter design method proposed in this article can achieve good soft switching effects, resulting in a 5% increase in power efficiency. By implementing soft switching and removing thick heat dissipation fins, the volume of the power supply can be reduced by 40%, Greatly improves the power density of the power supply. The modulation wave reconstruction nonlinear feedforward control strategy proposed in this paper reduces the output THD by 0.6% compared with the traditional control strategy in the 500W load testing, which can effectively improve the output power quality, and verifies the correctness of the theoretical analysis and the effectiveness of the control strategy.

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