The computational complexity of the three-level space vector pulse width modulation (SVPWM) limits its application in high-switching-frequency converters. To address this issue, this paper proposes a simplified SVPWM algorithm based on virtual chopping. Firstly, the reference voltage vector (VV) is adjusted to avoid excessive line-to-line voltage jumps. Secondly, boundary VVs in the space vector diagram, with simple switching sequences, are chosen as standards. Thirdly, the switching sequence of the reference VV is determined by virtual chopping the corresponding standard VV’s. Furthermore, to generate it in the microcontroller, the corresponding modulation waves are obtained. Finally, a method to balance DC side capacitor voltages is proposed. Consequently, the proposed algorithm simplifies the process, requiring only four equations. The sector determination, dwell time calculation and allocation are bypassed. Compared with the existing algorithms, the execution time and design complexity of the proposed algorithm in the microcontroller is reduced. Experimental results are presented to verify its effectiveness.

This paper clearly demonstrates the architecture of time synchronization network of experimental advanced superconducting tokamak (EAST) poloidal field (PF) power supply control system and analyzes characteristics of the IEEE 1588 in detail at the same time. IEEE 1588 has unique advantages for this paper to utilize as protocol in order to improve the accuracy of the time synchronization network (TSN). Consequently, we design a time synchronization system based on PCI eXtensions for Instrumentation-6683H. This paper utilizes one master node to synchronize all slave nodes on the time network in each second. The result shows that the synchronization accuracy can be achieved within 50 ns. According to results of experiments, this system can perfectly meet the requirements of EAST PF power supply control system.

With high real-time performance and a good filtering effect, the wavelet transform-based real-time filter is more commonly used in the fusion magnet power supply. Considering the signal characteristics of the fusion magnet power supply, the sliding time window method is widely used to satisfy the requirements of filtering efficiency. In this paper, an updated half-edge extension method is proposed to improve the boundary effect of sliding window data. Moreover, the hardware-based wavelet loopback structure is proposed to avoid the double computation of long sliding window data, thereby improving real-time performance and satisfying the demands of fusion magnet power supply filtering. The proposed half-edge extension method and the wavelet loopback structure are implemented by designed FPGA and experimented on the Experimental and Advanced Superconducting Tokamak (EAST) fusion magnet power supply system to verify the filtering efficiency. According to the experiment’s results, the proposed half-edge extension method has a better filtering effect, and the proposed wavelet loopback structure decreases the time by 67.4%, which can satisfy the requirements of the power supply system.

The uncertainty of wind resources is one of the main reasons for wind abandonment. Considering the uncertainty of wind power prediction, a robust optimal dispatching model is proposed for the wind fire energy storage system with advanced adiabatic compressed air energy storage (AA-CAES) technology. Herein, the operation constraints of the power plant and constraints of the reserved capacity are defined according to the operation characteristics of AA-CAES. Based on the limited scenario method, a solution framework is proposed to achieve the optimal robustness and economical operation of the system, which provides a new way for the application of the intelligent algorithm in the robust optimal dispatching. Specifically, a novel equilibrium optimization algorithm is employed to solve the optimal dispatching problem, which has good global search performance. The proposed solution is validated through simulations based on the IEEE-39 node system. The simulation results verify the effectiveness of the proposed dispatching model and the intelligent solver.

Integrated gate commutated thyristor (IGCT) is the core device of a new fusion power supply for Comprehensive Research Facility for Fusion Technology (CRAFT), which is very important to establish an accurate, suitable, and effective device model. To establish a unified simulation model (USM) suitable, this article analyzes the process of carrier motion in the process of IGCT turning on and off. The structure of the electrical model and the calculation method of related parameters are obtained by fitting the mathematical equations. Using standard passive components, such as resistance, capacitance, inductance, and an accurate bipolar junction transistor (BJT) model, converting the physical model into the electrical model can be realized. At the same time, because the physical model contains temperature parameters, compared with the traditional IGCT model, this model combines the thermal model with the electrical model, which makes the model unified. In this article, the 4000-A/4500-V IGCT power device in ABB is taken as an example to verify the rationality of the electric-thermal model under different currents and temperatures through MATLAB/SIMULINK simulation and experimental test.