首次把单相T型三电平逆变器应用在可切换智能负载的电力弹簧中，降低了负载电压的谐波含量，建立了可切换智能负载的T型三电平电力弹簧的数学模型。并推导了传统载波调制对可切换智能负载的T型三电平电力弹簧直流侧中点电位的影响，引入了中点电位控制方案，结合积分分离控制思想得到了可切换智能负载的T型三电平电力弹簧的控制策略。该控制策略能有效降低负载电压在网侧电压波动时的超调量。最后，通过Matlab/Simulink仿真验证，在稳关键和非关键负载电压时，改进后的谐波含量降低了3.47%和1.65%，超调量降低了0.34%和0.1%。

The single-phase T-type three-level inverter is firstly applied to the electric spring with switchable smart load, which reduces the harmonic content of the load voltage and a mathematical model of the T-type three-level electric spring with switchable smart load is established. And, the influence of the traditional carrier modulation on the mid-point potential of the T-type three-level electric spring with switchable smart load on the DC side is derived, and the control scheme of the mid-point potential is introduced, which combines with the integral separation control idea to obtain the control strategy of the T-type three-level electric spring with switchable smart load. The control strategy can effectively reduce the overshoot of the load voltage during the fluctuation of the grid voltage. Finally, it is verified by Matlab/Simulink simulation that the improved harmonic content is reduced by 3.47% and 1.65%, and the overshoot is reduced by 0.34%and 0.1% when stabilizing the critical and non-critical load voltages.