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针对 Buck-Boost 变换器的非线性特征给飞轮储能系统的放电运行状态带来的控制问题，提出了电压电流双环非线性控制算法。基于输入/输出线性化理论，推导出电流内环的控制律，并证明了内动态的稳定性。电压外环采用鲁棒性强的滑模变结构控制方法，并增加限流环节，保证放电电路安全、稳定运行。在Matlab/Simulink仿真平台中搭建飞轮放电模型，对所提出非线性控制算法进行了仿真验证。仿真结果表明，相比于双环PI控制，该算法能够明显改善输出电压调节时间、超调量等动态特性，在输入电压存在大范围变化的情况下，输出电压能够保持恒定和较低的纹波系数。“,” In view of the control problems caused by the nonlinear characteristics existed in buck-boost converter of the flywheel energy storage system (FESS) in the discharging mode, a voltage current dual-loop control algorithm was proposed in this paper. Based on input-output linearization theory, an inner-loop-current control law was derived and its stability of internal dynamics was proved. Sliding mode control method with strong robusticity was used in the outer voltage loop, and a current-limiting segment was added to guarantee the security and stability of the discharging circuit. Simulation model was constructed in Matlab/Simulink platform, and the effectiveness of the algorithm was confirmed. Simulation results show that, in comparison to the dual-loop PI control method, the proposed algorithm can significantly improve the dynamic characteristics of the output voltage to keep constant with low ripple coefficient as the input voltage varying in a large range.