The massive access of 5G base stations has injected new vitality into the low-carbon development of integrated energy system （IES）. By stimulating 5G base stations to participate in demand response and incorporating them into the scheduling framework of IES，energy saving and emission reduction of IES can be effectively promoted and the overall economic benefits of IES can be improved. Accordingly，a campus IES day-ahead scheduling model that considers low-carbon empowerment of 5G base stations was proposed. Firstly，the basic structure and main energy consumption inside the 5G base station were analyzed，and a flexible interaction model between the 5G base station and the IES system was constructed；secondly，a price-based demand response model based on the price elasticity matrix and a substitution-based demand response model based on the electric energy-thermal energy interconversion were constructed，and the IES day-ahead scheduling model was built with the lowest scheduling cost as the objective function；meanwhile，the IES risk-averse robust model was further constructed by using the information gap decision theory to deal with the uncertainty of renewable energy output. Finally，the effectiveness of the proposed model and the proposed algorithm were verified by various typical operation scenarios in an IES system.

The participation of wind power and energy storage in primary frequency regulation of power grid can make better use of the advantages of wind power and energy storage for frequency regulation，which has gradually become a new trend. However，there are some problems in the coordination of wind power system and energy storage，such as insufficient utilization of energy storage and mismatch of wind power and energy storage power. Aiming at the above problems，an improved wind-storage combined primary frequency control strategy was proposed. Through frequency separation，design of six operating conditions and the switching rules，optimization of wind power and energy storage adaptive droop coefficient，the charging and discharging function of energy storage battery was realized，the power mismatch problem in operating condition switching was improved，and the excessive compensation of power shortage caused by this was avoided. Finally，the wind energy utilization efficiency and frequency regulation effect of the proposed control strategy and the existing control strategy were compared through simulation and wind storage experimental platform，and the effectiveness and superiority of the proposed control strategy were verified.

Static var generator（SVG）can governance power quality，energy conservation and reduce consumption，furthermore it is an energy consumption product.The reasonable evaluation of the energy saving of the device has become an urgent problem to be solved. The power saving measurement technology of products was studied，and it was found that the existing power saving verification methods are not test methods. Because the field conditions are not unified，the verification results are not comparable. They can not be the data support of energy saving evaluation. At present，there is no set of effective testing methods in the field of inspection and testing that can be used for the power saving measurement of products in third-party testing laboratories，which makes both the testing work and energy saving evaluation work cannot be carried out.In order to make up for the above proposed detection technology gap，the innovative test method of design simulation resistance was proposed，so as to help complete the power saving measurement work. And a test platform was set up in the laboratory，to verify the feasibility and correctness of the method，and to assess the dispersion of the measurement results.The final conclusion is that the proposed method can be used for the third-party laboratory to complete the power saving measurement，flexible and controllable test conditions，can meet the requirements of various working conditions of the manufacturer，and the measurement results are comparable，can become the data support of energy saving evaluation，promote product iteration and update，and promote the progress of the industry.

The development status of electric drive systems in the industrial sector and their significance in promoting green and low-carbon transformation were studied. As a crucial control and energy-saving equipment in the industrial sector，electric drive systems face numerous challenges posed by unchecked development. It is imperative to enhance the overall quality and energy efficiency levels by optimizing the industry order. Firstly，the current development status of electric drive systems both domestically and internationally were analyzed，and discussed the energy efficiency requirements for products in the global community. Furthermore，problems encountered by electric drive products in the green and low-carbon development of China's industry were discussed. To promote sustainable development of electric drive systems，a green and low-carbon development path was proposed，including strengthening the standardization system for electric drive products，enhancing the implementation of standards，promoting mandatory certifications，and disseminating energy-saving technologies. Simultaneously，the importance of placing emphasis on and regulating the recycling phase of electric drive products was emphasized. Through these measures，electric drive systems hold promise to make a greater contribution towards the green and low-carbon transformation of industry.

The traditional control of electromechanical actuator in aviation electromechanical servo system mostly adopts two-level inverter and PID control，which can not achieve higher precision control of permanent magnet synchronous motor. In view of the above problems and the difficulty of space vector modulation algorithm to solve the problem of neutral point voltage balance，a model predictive control method based on improved virtual space vector method was proposed，and the corresponding control strategy was designed. The model predictive control was used to improve the control response speed and control accuracy of the permanent magnet synchronous motor. The neutral point clamped（NPC） three-level inverter with more sinusoidal output was used. The improved virtual space vector pulse width modulation（VSVPWM） was used to construct a dodecagon virtual space vector diagram closer to the vector circle. The simulation results show that the improved method can realize the stable operation of permanent magnet synchronous motor under low torque ripple，and has a good control effect on the midpoint voltage balance problem.

In response to the poor disturbance rejection performance and issues of parameter perturbation and control precision in traditional control strategies for interior permanent magnet synchronous motors （IPMSM），a fuzzy sliding mode control strategy based on the super-twisting disturbance observer was proposed. This strategy enables wide-speed-range operation of IPMSM，and further improves rotational speed tracking precision and the system's disturbance rejection capabilities. Firstly，the speed control range was broadened by combining maximum torque per ampere ratio with the gradient descent method for weak magnetic control. Secondly，the super-twisting algorithm（STA）was utilized to design a disturbance observer，thus enhancing the system's ability to resist disturbances. In addition，to address the derivative explosion problem in Backstepping control，a second-order sliding mode differentiator was used to approximate the virtual control rate. The fuzzy logic system was adopted to approximate the nonlinear part in the model of IPMSM，reducing the impact of motor parameter perturbation on control performance. Finally，the stability of the proposed control strategy was confirmed by applying Lyapunov theory. Through simulation on the Matlab/Simulink platform，it was verified that under the control strategy proposed，IPMSM demonstrate superior wide-speed-range dynamic performance and robustness.

Aiming at the problem of insufficient frequency modulation capability of direct-driven wind turbine under traditional virtual inertia control，a control strategy of super capacitor assists direct-driven wind turbine participating in frequency modulation was proposed to improve the frequency stability of power grid after wind power is connected. Firstly，the influence of the fan speed and output power on the frequency modulation capability when the direct-driven wind turbine participates in the frequency modulation through virtual inertia control is analyzed，and the frequency modulation coefficient was established through the Sigmoid function to characterize the frequency modulation capability of it under different operating conditions. Then，based on the frequency modulation coefficient，a frequency modulation strategy for wind storage was proposed，that is when the frequency modulation ability of direct-driven wind turbine is strong，the direct-driven wind turbine participates in the frequency modulation independently，while when the frequency modulation capability is weak，the power required for the frequency modulation is jointly provided by the direct-driven wind turbine and the super capacitor. At the same time，the charging and discharging coefficient was introduced into the power control of the super capacitor to avoid its over-charging and over-discharging. At last，the simulation results show that the proposed method is better than the traditional virtual inertia control when frequency modulation capability of the direct-driven wind turbine is insufficient，and it also avoids overcharging and discharging of super capacitor.

When the Vienna rectifier is connected to unbalanced loads operating under light load conditions，the slight power difference causes unbalanced voltage of bipolar DC bus，which increases the voltage stress on the switching device and DC-link capacitance. To solve the above problems，a DC offset reduction of neutral point voltage strategy based on reactive current compensation for Vienna rectifier with bipolar DC-link was proposed. By combining the amplitude of zero-sequence component，which is superimposed onto the three-phase reference voltage，the neutral point current for various power conditions can be obtained. The effect of the phase angle difference between the reference voltage and the input current on the neutral point current was analyzed，and the maximum reactive currents of the odd and even sectors was obtained according to the operating region of the Vienna rectifier. In order to increase the neutral point current under light load condition，the reactive current was injected to change the phase angle difference according to the contour of neutral point current，thereby achieving the balance of bipolar DC bus under light load conditions. Finally，the effectiveness of the proposed strategy was verified on the Vienna rectifier experimental platform.

Switching power supply is now developing towards high-frequency soft-switching and high power density，the volume of magnetic components is greatly reduced，and the excitation inductance of transformer no longer meets the assumption of large excitation inductance in traditional analysis. Under this background，the influence of the weak excitation inductance on the full-bridge circuit was analyzed，and proposed that the full-bridge circuit can achieve autonomous soft-switching through the charging and discharging of the capacitor under the condition of the weak excitation inductance. The autonomous soft-switching of the full-bridge converter can be realized when the duty ratio is large. Through principle analysis and calculation，relationship between the charge and discharge of the switch body capacitance and the inductance current and the time constant was obtained，and the above principle through simulation were verified. Finally，an experimental platform with a working frequency of 200 kHz was built to verify the above analysis and simulation results.

In order to solve the problem of large peak-to-peak inductor currents in dual active bridge converters with mismatched input and output voltages，a four-degree-of-freedom modulation（FDFM） strategy was proposed by combining symmetric duty cycle modulation and asymmetric duty cycle modulation. By analyzing the operating modes of the four-degree-of-freedom modulation strategy，the peak-to-peak inductor current and transmission power models were established，and the optimal solution with different transmission powers was solved by using the Karush-Kuhn-Tucker（KKT） condition with the peak-to-peak inductor current as the optimization objective. And the experimental prototype was built to verify the effectiveness of the proposed strategy. The experimental results show that the proposed modulation strategy can effectively reduce the peak-to-peak inductor current of the converter and improve the efficiency of the dual active bridge converter.