As China accelerates its transition to a low-carbon society, its power system is facing growing challenges in terms of maintaining adequacy amid a rapidly evolving energy structure. The concept of adequacy, traditionally focused on power capacity and generation, has broadened to include dimensions like flexibility and inertia. Against this backdrop, optimizing the integration of coal power and renewable energy to meet the system’s needs for adequacy, flexibility, and frequency stability has become a critical research area. This paper introduces the concept of “Generalized Adequacy”, expanding the traditional understanding of adequacy, and proposes an optimization model for the coordinated development of coal power and renewable energy based on this concept. This study examines the effects of extreme weather, renewable energy penetration, wind–solar ratios, and generalized adequacy constraints using a case study from a central region of China. The findings reveal that extreme weather conditions drive an increase in photovoltaic installations, while higher renewable energy penetration leads to more wind power installations. Accounting for generalized adequacy constraints can moderate the retirement of coal-fired plants, reducing unnecessary inertia support in normal conditions and ensuring dynamic frequency stability during extreme weather events.

Aiming at the problem of cross-domain risk assessment in cyber power physical system, this paper proposes a cross-domain risk assessment method based on network attack. Firstly, the attacker resource constraint and system flow constraint are considered, and a FDI attack model aiming at minimizing attack cost is proposed. Then CVSS is used to evaluate the exploitability of vulnerabilities, and a Bayesian attack graph is established based on the distribution of vulnerabilities to calculate the prior probability of successful attacks. Then the probability of network attack combination is obtained from the minimum attack cost and prior probability. Secondly, the physical consequences of network attacks are calculated based on DC optimal power flow algorithm. Finally, the cross-domain risk of the system is evaluated by combining the probability of network attack combination and the physical consequences of network attack. Through simulation verification, the method in this paper effectively reduces the difficulty of cross-domain risk quantitative assessment in the cyber power physical system, deeply explores the vulnerable links of the system, and provides references for improving the reliability of the system.

针对实际应用中LLC谐振变换器存在许多问题,分析了适用于微网系统中连接储能系统的CLLLC谐振变换器的工作原理,利用基波分析法(FHA)建立变换器等效模型,得到其增益曲线,分析了谐振参数差异对增益曲线的影响.采用一种复合软起动控制策略,有效降低了启动过程中谐振网络中的冲击电压和电流.采用一种电流控制型同步整流控制策略,提高了变换器的效率.利用MATLAB/Simulink进行仿真,仿真结果验证了 CLLLC谐振变换器设计和理论分析的正确性.

合理的光伏安装方案有利于降低配电系统的供电成本和提高能源利用率,因此需要根据供电经济性指标确定配网中分布式光伏的最佳接入容量.提出一种基于配网运行裕度的光伏最佳接入容量评估方法.该方法利用配网运行裕度信息,把高维的光伏多节点并网优化问题降至1维的光伏总接入容量优化,且利用分布式调度实现了不同主体的协同运行.通过对改进的IEEE 33节点系统开展算例分析发现,根据所提方法确定的光伏最佳接入容量超过了配网最大负荷与线路容量之和,为高比例分布式光伏接入配电网奠定了理论基础.

电动汽车充电技术伴随着电动汽的日益普及而得到长远的发展.车载储能系统由于其不需要充电桩支持,具有即插即用的特性而受到关注.其中,复用驱动电机和驱动变流器组成车载储能变流器的方案由于较高的系统集成度和功率密度在近些年受到了广泛的研究.归纳整理关于驱动复用型车载储能系统的拓扑的研究成果,对每种拓扑的优缺点进行总结.提出了对于驱动复用型车载储能系统充电时的关键指标转矩和纹波的分析方法,并以此为主要依据对各种拓扑方案进行了比较.

With the continuous improvement of the social and economic level, the current demand for power and energy is also constantly improving, along with higher requirements for the quality of power distribution.Therefore, in the new era, under the background of the comprehensive energy use system, we should fully grasp the specific needs of the people for power and energy, and carry out a scientific and reasonable distribution grid construction.

在新型电力系统背景下,不确定因素的广泛接入为配电网可靠性带来了巨大挑战.为更合理地配置配电自动化终端以解决可靠性问题并提升方案的经济性,提出了基于状态变量分解的配电自动化规划模型.首先,根据相关导则和文献研究的总结,初步构建了供电单元网架规划和自动化配置映射集合;其次,以状态变量分解和局部线性化的方式将电网整体规划问题转换为供电单元局部规划问题,并在连续化后以卡罗需-库思-塔克(Karush-Kuhn-Tucker,KKT)条件求解;最后,通过对某地城市配电网的算例研究,分析了不同接线方式下终端配置数及线路分段数对投入产出比的影响,得出了不同情况下的最优配置方案,验证了所述模型的有效性.

Under the “double carbon” goal, it is becoming more important to adapt demand response strategies to promote the sustainable development of energy resources. In order to effectively carry out the response of power demand for promoting the healthy development of demand-side resources, a long-term development strategy is required to be formulated. This paper analyses the development status of demand-side resources in China Jibei, and the internal and external factors that affect the development of demand-side resources are analyzed by using SWOT model. Research shows that the development of demand-side resources in China Jibei is facing the bottleneck of applied technology, benchmarking technical problems and policy difficulties. This paper firstly analyzes the Strengths (S), Weaknesses (W), Opportunities (O) and Threats (T) of demand-side resource development in China Jibei using SWOT analysis. Then it puts forward Strengths and Opportunities (SO) strategies (intensifying the development) to get rid of the current dilemma and promote the healthy development of demand-side resources for China Jibei. Which is implemented by means of strengthening demand-side resources development and utilization, consolidating and tapping market potential, and enhancing the company's dominant position in the electricity market.

With the development of Internet of Things（IoT）technology, the large-scale access of smart terminal equipment is the general trend. At the same time, a large number of distributed generation access also has an impact on the distribution network architecture. This paper first studies the distributed architecture of distribution network in the future and puts for-ward the idea of distribution network which can transform between centralized form and distributed form. The evaluation and division method of coupling units are given. Then, the method of flexibility modeling is studied and applied to distribution network planning. Finally, an example is given to test the assumption.

As more and more distributed generation are widely integrated to the distribution network, the risk of node voltage and power flow exceeding the limits is greatly increased. The installation of energy storage can suppress the fluctuation of renewable power output and promote the distributed generation consumption. A distributed photovoltaic-storage system optimization planning method based on day ahead economic dispatch is proposed. Its characteristic is to use the second-order cone to model the flexible resources in source-network-load-storage. Through the analysis of IEEE 33 bus system, it is found that part of the output of the DG is abandoned and the installation of ES can improve the power supply income of the distribution system.

With the continuous acceleration of urbanization and the increasing demand for electric power by social development, the construction scale of Chinese power distribution grid is also getting bigger and bigger. The planning and construction of power distribution grid is an important guarantee for the national economic and social development.Based on the analysis of different comprehensive energy use scenarios, this paper explores the feasible strategy of distribution grid optimization construction, hoping to provide some reference for relevant work.

To better process the influence of loss reduction by time division and switching operation in distribution network dynamic reconfiguration, this article supports the distribution network reconstruction based on the bi-level time division. This method, based on the digital twin technology, constructs the digital twin model of the distribution network dynamical reconfiguration to take advantage of the digital twin to conclude the distribution network optimization structure under multiple time segments. This article aims to arrive at the requirements of the dynamical reconfiguration to computing efficiency to proposes the redundancy elimination method and the neighbourhood search method to improve the harmony search algorithm and the particle swarm algorithm to get the model solution. Applying the simulation of the IEEE33 node system verifies the high speed and efficiency of the above-described method.

With the rapid development of China’s economy, people’s demand for electricity is increasing. In order to ensure the reliability of power supply, a dual Q programming model of distribution network is proposed. In this paper, the overview of “double Q theory” and key technologies are described, and the problems and optimization of medium voltage distribution network planning are discussed for readers’ reference.

Integrated energy systems can realize the mutual coupling of various energy sources, and coordinate the management of different energy sources such as cooling, heating, and power in the system. A planning method based on an improved Jaya algorithm is proposed for a multi-energy interactive integrated energy system. Firstly, a planning model of an integrated energy system is constructed that takes into account the costs of the initial investment in the system construction, system operation, system maintenance, and system carbon emissions. Secondly, to solve the model, an improved Jaya algorithm is proposed to obtain higher solving accuracy and anti-precocity ability. Finally, the simulation results verify the effectiveness and practicability of the proposed model and algorithm.

为提升电力负荷预测能力和电网业务需求信息处理效果,设计应用大数据分析的电网业务需求规划管理平台.以大数据平台为基础,通过传输机制完成电网业务需求在平台内横向集成以及管理层面的纵向贯通;平台工作层的典型业务分析模块负责各类业务需求数据的综合查找、汇总分析、重点工程的走廊展示等相关信息分析;规划信息管理模块通过电网业务功能管理和规划指标管理,完成电网基本情况、电网建设情况、用电情况等内容存储以及电网业务需求分析.实验结果显示,所设计平台的电力负荷预测能力强、信息覆盖度高、信息处理效果好.

随着移动互联网的不断发展,企业的生产经营数据呈现出爆发式增长态势,而人工智能、大数据技术的兴起,加速了企业数字化转型的步伐,为转变和改变现有商业模式、消费模式、社会经济结构、组织模式等提供了更多机会和可能,带来巨大的经济效益.尤其是近年来全球经济进入深度调整和结构变革新时期,数字经济迅速发展,为经济复苏和社会进步提供了巨大的能量,各国纷纷出台相应政策,推动传统产业向数字化转型.

In the construction of distribution network, low voltage distribution can ensure the stability of the whole power transmission, but it will also lead to poor operation because of the low voltage. When the operation of the operation and inspection system is unstable, the processing function of the data will decrease, and when the power problem is encountered, it will not react at the first time, so that the operation of the whole system will produce certain danger. The high permeability distributed power supply is connected to the distribution network, which exacerbates the volatility and instability of the distribution network. Therefore, it is necessary to improve the immunity of the distribution network while ensuring the function of the high permeability distributed power supply.

Coal-fired power has played an important role in the power systems, but its operational characteristics, especially the flexibility characteristics is modelled relatively simple in the current operation simulations. Given the background of a rapid development of renewable energy and a sustainable transformation of power systems in China, it is essential to build a refined model of coal-fired power units that can be incorporated into an operation simulation method. First, this study provides an analysis on the flexibility characteristics of coal-fired power units, including the minimum stable output, ramp limit and minimum up/down time. Subsequently, a multi-state probabilistic model of coal-fired power units is proposed. This study also constructs a sequential operation simulation method based on the universal generation function (UGF) method that incorporates multiple states of coal-fired power units. Finally, this study provides a development and transformation pathway for coal-fired power plants in the North Hebei (NH) region and suggestions for promoting a sustainable development of the power system based on the proposed method and multi-state model.

为了提高配电网功率分配效率,解决居住区可用电力资源功率公平分配问题,提出了基于熵权法的居住区配电网功率动态分配方法.根据熵权法原理及应用流程,对熵权进行标准化处理,并确定相关动态分配指标.定量描述用电负荷潮流分布不均情况,评估基于负载指标的熵配电网负载水平,以传输线路支路负载率、电压损耗、支路两端节点负载作为配电网功率动态分配度量,分析熵权配电网运行状态特征.依据熵权法具体实施步骤,实现居住区配电网功率动态分配.以居民区常规负荷为实验背景,将两种方法的分配效率进行对比分析,由实验结果可知,基于熵权法动态分配方法的最高分配效率可达到1.0,有效提升了用户满意度.

Coal-to-Electricity Projects are being carried on in North China in order to reduce air pollution. These projects have brought many challenges to present electric distribution networks. Therefore, this paper focuses on how the practical electric distribution systems act facing a large quantity of electric heating integration and how to improve the behaviours. Field researches are conducted covering all cities in North Hebei Province. The current problems in planning, operation and investment of the power distribution networks supporting Coal-to-Electricity Projects are founded, and the reasons are analysed. The suggestions on the above three aspects are put forward accordingly. Case study on the distribution system in Xianghe County is conducted, and the effectiveness of the proposed approaches are verified. This study may give reference on Coal-to-Electricity related electric distribution work for other places and for the future, and also guide practical planning, operation and investment of power distribution systems on special issues.