Hydrogen production from wind power can achieve zero emission of carbon, which is an important measure to promote the low-carbon transformation of energy industry of China. In this paper, an optimal dispatch strategy of wind-hydrogen coupling system (WHCS) considering step carbon trading mechanism is proposed. Firstly, the model of WHCS is established, and the real-time electricity price fluctuation is determined by forecasting load and real-time electricity price. Then, based on the problem of WHCS participating in the carbon trading market, the stepped carbon trading mechanism model for limiting carbon emissions is proposed. Finally, an optimal dispatch strategy is proposed to minimize the operating cost of the system. The results show that compared with the traditional carbon penalty mechanism, the optimal dispatch strategy in this paper can reduce the carbon emission of the system by 1456.98 kg.

The opening and closing of a vacuum circuit breaker in the selected phase of the system voltage and the associated electrical equipment plug in or disconnect the electrical system with minimal impact on itself and the system. To realize this and ensure the control precision and stability of its action process, this study designs the drive motor and controller of a vacuum circuit breaker actuator. Additionally, a new function-switching pseudo-differential control (FPD) strategy is based on the feedback element principle. The control strategy avoids the direct differentiation of the controlled variables and has the ability of a fast dynamic response and anti-interference. At the same time, according to the moving process of the circuit breaker contacts, the control parameters are directly assigned to the system in stages, which reduces the amount of calculation and enhances the response speed of the control system. According to the research on the motor actuator movement process, the motor actuator and its control system of a 40.5 kV vacuum circuit breaker are developed and verified by closing operation in the selected phase, and the experimental results show the effectiveness of the proposed control strategy.

Under the path of global low-carbon development, increasing the proportion of renewable energy in the power grid will become the main goal in the future. But, it will also aggravate the problem of wind and solar curtailment. A joint optimal scheduling model of a renewable energy regional power grid with an energy storage system and concentrated solar power plant is proposed in this study. The proposed model takes the lowest comprehensive operation cost of the power grid as the optimization goal and considers various constraints of concentrated solar power plants, energy storage systems, thermal power units, wind power, and photovoltaic power generation. Finally, a modified IEEE 9-bus system is used to verify the validity. The results show that the model can effectively improve the system node voltage, promote the accommodation of wind and solar power, and alleviate the peak shaving of thermal power units under the premise of optimal economy pressure.

To reduce the impact of the imbalance of mixed non-linear loads on an inverter voltage output in the microgrid, we improve the disadvantage of the lack of damping and inertia for traditional droop control. This paper proposes a comprehensive virtual synchronous generator (VSG) control strategy for harmonic suppression and imbalance suppression of a multi-inverter parallel microgrid. On one hand, an improved VSG control strategy is proposed to increase the damping and inertia of distributed generations (DGs) in the microgrid, and secondary control is introduced to improve system stability. On the other hand, the frequency division suppression control strategy is used to eliminate the influence of harmonics, and the negative sequence component is compensated to eliminate the influence of imbalance. Then small-signal analysis is used for analysis of the stability of the strategy. Finally, we verify the comprehensive control strategy proposed in this paper through experiments. The experimental results suggest a significant improvement on the voltage, frequency, power optimization, handling of non-linear load and capacity distribution precision, as well as providing inertia support for the system.

Hydrogen energy has an important role in superconducting energy storage cooling and materials synthesis. As the power-to-hydrogen (P2H) loads, alkaline electrolytic cells (AEC) and proton exchange membrane electrolytic cells (PEMEC) have different technical characteristics (TCs). This paper proposes an optimal capacity configuration model for the hybrid electrolytic cells P2H system in distribution system (DS). Firstly, a unified operating model for the electrolytic cell is established. Secondly, the optimal capacity configuration model is proposed with the objective function to minimize the total cost of the DS, including the numbers and capacity configuration of the hybrid electrolytic cells. Finally, the proposed model is verified by using the modified IEEE 33-bus system. The results show the total cost of the proposed model reduced by 4% and 11%, the hydrogen production power increase of 0.26% and 0.52% compared to the AEC and PEMEC configurations only. The study provides a reference for the configuration of large-scale hybrid electrolytic cells in power system.