由于传统化石燃料逐渐耗尽，环境污染严重以及温室效应的形成，新能源发电等电力电子相关技术被大力发展。双向DC/DC变换器作为发电与储能系统中的能量传输部分，实现了新能源发电与储能系统之间的协调配合使用。但实际中存在负载突增、突卸与输入电压不稳定等问题。因此探究双向DC/DC变换器设计方法，研究并设计提高变换器稳态精度与瞬态响应速度的控制策略，将进一步提升系统协调性与稳定性。

以双向半桥变换器为研究对象，深入分析其独立和互补PWM控制方式下的工作过程，推导出电感电流、输出纹波电压表达式，得出电路不同控制方式下的运行状态、电感和电容选取准则。基于状态空间平均法建立不同工作模式下的小信号模型，对比发现独立模式为互补模式的一种特殊模态；基于互补PWM控制方式下的模型分析得出了占空比与电压、功率流向之间的关系，推导出变换器功率流向判别条件。依据变换器工作过程与功率流向判别条件提出一种基于电感电流的双向切换控制策略，简化控制器设计过程，建立了统一控制模型。深入分析变换器两模式开环特性，设计两模式下的电压控制补偿环节；根据双向切换控制策略，以平均电感电流的流向为判断标准设计电流环与双向切换电流控制器。在PID控制器的基础上，将模糊控制灵活度高的优点与常规PID补偿网络精度高抗干扰能力强的优点相结合，提出模糊PID控制策略，通过模糊规则优化PID参数，得到模糊PID控制器。 

根据技术指标制作了基于模糊自适应PID的双向半桥变换器实验样机，搭建测试平台并完成实验验证。结果表明：稳态情况下变换器BUCK模式效率达到95%，BOOST模式下效率达到91%；在输入电压突变与负载突变条件下，保持输出快速恢复稳定；在达到切换条件时，稳定进行模式切换。实验验证了理论分析的正确性与控制方式的合理性。

Due to the gradual exhaustion of traditional fossil fuels, serious environmental pollution and the formation of the greenhouse effect, new energy power generation and other power electronics-related technologies have been vigorously developed. As the energy transmission part of the power generation and energy storage system, the bidirectional DC/DC converter realizes the coordination and cooperation between the new energy power generation and the energy storage system, and solves the problem of unbalanced power supply and demand. Therefore, exploring the design method of the bidirectional DC/DC converter, researching and designing the control strategy to improve the steady-state accuracy and transient response speed of the converter will further improve the coordination and stability of the system.

Taking the bidirectional half-bridge converter as the research object, it deeply analyzes its working process under the independent and complementary PWM control modes, deduces the expressions of the inductor current and output ripple voltage, and obtains the operating state and the inductance and capacitance of the circuit under different control modes. Selection criteria. Based on the state space averaging method, the small-signal models under different operating modes are established, and the independent PWM mode of the bidirectional half-bridge converter is found to be a special case of the complementary PWM mode. Based on the model analysis under the complementary PWM control mode, the duty cycle and The relationship between the voltage and the power flow is derived, and the judgment condition of the power flow of the converter is deduced. According to the working process of the converter and the judgment conditions of the power flow, a bidirectional switching control strategy based on the inductor current is proposed, and a unified control model is established. Compared with the traditional control strategy, the converter can switch the working mode according to the set threshold, which simplifies the controller design. Process. In-depth analysis of the open-loop stability of the converter in two modes, analysis of the performance indicators of the converter according to the stability standard, and design of the voltage control compensation link under the two modes; with the flow direction of the average inductor current as the judgment standard, the current loop and the current loop are designed according to the bidirectional switching control strategy. Bidirectional switching current controller. On the basis of PID controller, combining the advantages of high flexibility of fuzzy control with the advantages of high precision and strong anti-interference ability of conventional PID compensation network, a fuzzy PID control strategy is proposed, PID parameters are optimized by fuzzy rules, and a fuzzy PID controller is obtained.

According to the technical indicators, a test prototype of the bidirectional half-bridge converter based on fuzzy adaptive PID was made, and the test platform was built and the test verification was completed. The results show that the efficiency of the converter in buck mode reaches 95% in steady state, and the efficiency in boost mode reaches 91%; under the condition of sudden change of input voltage and load, the output can be maintained quickly and stabilized; When the switching conditions are reached, the mode switching can be performed stably. The experiment verifies the correctness of the theoretical analysis and the rationality of the control method.

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