Abstract
With a high proportion of renewable distributed generation and time-varying load connected to the distribution network, great challenges have appeared in the reactive power optimization control of the active distribution networks. This paper first introduces the characteristics of active distribution networks, the mechanism and research status of wind power, photovoltaic, and other renewable distributed generators, and time-varying loads participating in reactive power and voltage optimization. Then, the paper summarizes the methods of reactive power optimization and voltage regulation of active distribution network, including multi-timescale voltage optimization, coordinated optimization of network reconfiguration and reactive power optimization, coordinated optimization of active and reactive power optimization based on model predictive control, hierarchical and zoning control of reactive power, and voltage and power electronic switch voltage regulation. The pros and cons of the reactive power optimization algorithms mentioned above are summarized. Finally, combined with the development trend of the energy Internet, the future directions of reactive power and voltage control technology in the active distribution network are discussed.
Highlights
As one of the most abundant renewable energy areas in China, the total exploitable amount of wind and photovoltaic energy resources in Northwest China ranks at the forefront
By 2021, the new energy power generation dominated by renewable distributed generation (RDG) such as wind power and photovoltaic accounted for about 11% of the power consumption of the whole society, of which Qinghai and Gansu provinces account for more than 50% and 40%, respectively
Erefore, by expounding the characteristics of active distribution network with RDGs and time-varying loads, this paper discusses the voltage regulation mechanism of wind power, photovoltaic, and other renewable distributed generation participating in active distribution network and the research status of time-varying load participating in voltage regulation
Summary
As one of the most abundant renewable energy areas in China, the total exploitable amount of wind and photovoltaic energy resources in Northwest China ranks at the forefront. To promote energy conservation and emission reduction, develop a green economy, and help achieve the goal of “Carbon Peaking and Carbon Neutralization” in advance, developing new energy sources dominated by renewable distributed power and vigorously developing distribution networks containing RDG can effectively improve the energy efficiency of power system generation, transmission, distribution, and utilization. Erefore, by expounding the characteristics of active distribution network with RDGs and time-varying loads, this paper discusses the voltage regulation mechanism of wind power, photovoltaic, and other renewable distributed generation participating in active distribution network and the research status of time-varying load participating in voltage regulation. E rest of this paper is organized as follows: the second part introduces the characteristics of active distribution network, the third part introduces the source load reactive power regulation mechanism in active distribution network, the fourth part summarizes the reactive power optimization methods, uncertain problem processing methods, and solution algorithms, the fifth part prospects the future research, and the sixth part gives the conclusion
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