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Electric power is vital for the national security, economy, and people’s livelihood of a country. Ensuring the stable and secure supply of electric power is crucial for achieving carbon peaking and carbon neutrality. Therefore, it is imperative to analyze the weaknesses and challenges of power supply security in China and construct a power supply guarantee system that adapts to the new era and facilitate high-quality economic development. Herein, the research progress of power security supply is reviewed, the current status of power supply in China is summarized, and the trend in power security supply in China during the 14th Five-Year period and for the medium and long terms is analyzed. Moreover, considering the recent power rationing incidents, the problems and challenges for power supply in China are summarized and analyzed. On this basis, the basic principles of adhering to security first, a low-carbon path, market-oriented reforms, and technological innovations are proposed, and a three-step roadmap for constructing a new power supply guarantee system is investigated. Furthermore, we propose the following suggestions: (1) enhancing China’s power supply guarantee capabilities to solidify its foundation for power supply security; (2) improving the intrinsic security of power supply by focusing on the demand side; (3) establishing a new-generation technical system for guaranteeing power supply security; and (4) optimizing the market system to construct a power security ecology participated by all.

The construction of a new electric power system is the key path to achieve the carbon peaking and carbon neutrality goals and ensure energy transition security. As the largest man-made system that is complex and highly nonlinear, the electric power system is the core of future energy transition. However, the security of the electric power system faces severe challenges owing to the volatility and randomness of new energy power generation. Considering the new situation and challenges faced by the energy transition security in China, this study clarifies the implications of energy security in terms of supply, environment, economy, and technology, investigates the development goals and strategic paths for energy transformation, and explores the significance of the new electric power system to energy security. The key factors of power source, power grid, load, energy storage, market, and technology that affect the new electric power system security are analyzed. According to the study, the core systems required for the security development of the new electric power system should be constructed from three aspects: emergency warning, sharing and mutual aid, and security defense. Furthermore, the basic idea for the research on the new electric power system development path is proposed to provide a basic reference for the new electric power system construction and the security development research.

[Introduction] With the continuously increasing of the installed capacity and proportion of wind power and other new energy sources generation, the peak-shaving problem of receiving power system with nuclear power(such as Guangdong Power Grid) in flood season will be more prominent due to the influence of wind power anti peak shaving characteristics. In order to ensure the coordinated development of multiple types of power supply and the safe and reliable operation of power grid. [Method] Aiming at the peak shaving problem of the receiving end power system with nuclear power under the wind power grid connection, based on the full analysis of the domestic and foreign nuclear power units' participation in peak shaving and their technical economy, combined with the shortcomings of the conventional deterministic peak shaving check method, a peak shaving balance analysis method combining certainty with probability, typical week / typical day and whole year 8 760 h panoramic simulation was proposed. [Result] Taking the coastal provincial power grid as an example, the proposed method was applied to analyze the peak-shaving situation of receiving power system under different scenarios, and then some suggestions was presented. [Conclusion] The proposed method can give full play to the advantages of both deterministic and probabilistic methods and carry out more comprehensive and effective analysis and verification of the system peak regulation balance.

Massive and diversified distributed energy resources (DERs) have great potential for improving the flexibility of power system operations. However, given the wide distribution, small capacity, and variable ownership subject characteristics of DERs, virtual power plants (VPPs) are suitable for aggregating the flexible DERs for participation in the wholesale energy market. Extant studies have focused on obtaining bidding strategies in multiple electricity markets. However, there are shortcomings in the relevant market mechanisms and temporal relationships for participating in energy and ancillary service markets. This work proposes a joint market temporal rolling bidding strategy for VPPs in the wholesale market based on real unified electricity market mechanisms in the southern region of China. Accordingly, the proposed method enhances the market-oriented operational profits of VPPs. [ABSTRACT FROM AUTHOR]