In the face of increasingly complex international relations, the core algorithm SCUC/SCED in the field of power dispatch, which has long relied on foreign optimization solvers, faces enormous technical risks of being stuck in the neck. There is an urgent need to replace SCUC/SCED with domestic optimization solvers. To achieve unified construction of SCUC/SCED models under different optimization solvers and flexible calling of different solvers, a Python based autonomous and controllable modeling language was proposed, and an SCUC/SCED optimization model was constructed. Based on an actual calculation cases of a provincial power grid, optimization solvers such as COPT, MindOpt, SCIP, GUROBI, CPLEX, etc. were called to solve the problem. The effectiveness of the autonomous controllable modeling language and the convergence, stability, and efficiency of the domestically produced solver were verified, and it was proved that the SCUC/SCED algorithm has the substitute conditions for the domestically produced optimization solver.

Abstract With the increasing deployment of renewable energy resources, the scale of DC networks and renewable capacity continues to grow. System security is challenged by the decrease in inertia from traditional synchronous generators. In order to accommodate high‐penetration renewable energy, voltage stability should be considered in the renewable energy integration planning. Herein, first, a voltage stability‐constrained minimum startup index and algorithm for conventional thermal power plants are proposed. Then, based on time series production simulation, a renewable energy integration capacity analysis algorithm is designed considering voltage stability and peak shaving constraints. Finally, based on the boundary conditions of the “Fifteen‐Five Plan”, the renewable energy capacity considering voltage stability and peak shaving constraints for Northwest and East China power grids are analysed to verify the effectiveness and engineering practicality of the proposed methodology. The results demonstrate that the proposed method can maintain the renewable energy integration goal outlined in the “Fifteen‐Five Plan” while maintaining the voltage stability in these regions.

The low voltage ride-through (LVRT) characteristics of DPV are first analyzed in this paper, and then the influence of the LVRT control strategies and parameters of PDGs on the grid voltage stability is studied. Finally, the influence of load model with and without DG on grid voltage stability is studied, the simulation results show that it may be too optimistic when new energy sources are not considered.

This paper provides a review of the role of hydrogen in the energy transition and low-carbon development. Hydrogen is a promising option to support the carbon neutrality goal and the power system development. This paper examines the technologies and challenges of hydrogen in new power systems with a large proportion of renewable energy, and their applications in the power industry. It presents a review of the existing literature, focusing on the technology, economic and low-carbon value aspects of hydrogen. Additionally, this paper discusses policy measures for the future development of hydrogen. The analysis suggests that hydrogen has significant advantages in terms of zero pollution, high efficiency, diverse storage and production methods, and suitability for long-distance transmission. However, it also faces challenges such as high costs, lack of infrastructure, and technical barriers. The paper concludes that hydrogen has great potential to be an essential part of the change to a renewable energy future, but further research and policy support are needed to overcome the challenges and realize its full potential.

随着电网的发展,网架结构不断加强,交流系统短路容量逐步提高,短路电流超标问题日渐突出,需要合理控制系统的短路电流水平.基于系统拓扑动态调整的短路电流抑制措施,通过在故障期间快速动态改变系统拓扑结构达到限制短路电流的目的.该文以500kV和220kV典型接线为例,研究3/2接线与双母线接线的母线分段开关采用抑制措施后,对系统暂态功角稳定性的影响.根据理论及仿真分析得出,基于系统拓扑动态调整的短路电流抑制措施在有效减少短路电流的同时,对系统的暂态功角稳定性有一定的影响,实施中需要针对实际系统进行具体仿真分析.

新型电力系统背景下,新能源占比逐步提高.新能源的随机性、波动性和反调峰特性使电力系统调节困难,电力电量平衡分析面临新的挑战.本文结合能源转型战略需求,首先提出了新型电力系统电力电量平衡模式,给出了电力电量平衡关键流程;接着对火电、水电、抽水蓄能/储能电源进行精细化建模,建立时序电力电量平衡模型;最后基于实际电网数据的算例分析验证所提方法的准确性和效率.结果表明,该方法能够准确反映水、火和储能机组的出力特性,给出新能源消纳情况,支撑提升措施研究,显著提升科学规划水平.

With the construction of a new type power system in China, the large-scale development of renewable energy will cause serious power and electricity balance problems and renewable energy curtailment. It can significantly reduce renewable energy curtailment and mitigate power shortage with configuring a certain scale of energy storage system (ESS). In this paper, a collaborative energy storage planning method for provincial power grids considering the difference of multi sub-regions objectives is studied based on the time series production simulation method. Firstly, the algorithm framework of the mainstream time series production simulation software considering power system structure and tie-line tradition constraints is introduced. Then based on this software, the configuration capacity optimization method of ESS in each sub-region is proposed taking the differences in the assessment expectations of the sub-regions into account. Finally, a planned provincial power grid integrated with high penetration renewable energy in northwest China is carried out as a case study, which verifies its rationality and utility.

With the construction of a new power system, the large-scale development of renewable energy will lead to a seriously insufficient utilization rate of renewable energy and balance problems of power and electricity, which can be significantly alleviated by configuring a suitable energy storage system (ESS). In this paper, an ESS planning method considering the difference of multi-partition assessment objectives for provincial power grids is studied based on a self-developed time series production simulation software that contains power system structure and tie-line transaction constraints. Firstly, the algorithm framework of the time series production simulation software is introduced. Then according to this software, an optimal configuration method for energy storage capacity is proposed, with the minimum investment cost of energy storage as the objective function, after considering the differences in assessment objectives and tie-line transaction constraints of each partition. Finally, calculation and sensitivity analysis are performed on a planned provincial power grid integrated with renewable energy with a high proportion in northwest China, which verifies the rationality and utility of the proposed method.

In order to solve the problem that the inertia and system security of high penetration renewable energy grid decreases, conventional DC island transmission pure renewable energy which can electrically decoupling between large-scale renewable energy power grid and traditional power grid was proposed. Based on the effective capacity coefficient of renewable energy, calculation method of pure renewable energy installed capacity was proposed. Voltage and inertia support problems were solved by dynamic compensation equipment. Based on the minimum power fluctuation of new energy, the optimal hybrid ratio of wind and PV power was studied. Energy storage allocation under optimal ratio of wind and PV power hybrid transportation was also researched. Empirical analysis was carried out in Northwest Power grid. PSD-PEBL program was used to check the power balance which proves the feasibility of the proposed transmission mode. Case analysis proved the feasibility of the proposed transmission mode and provided a new transmission mode for large-scale new energy transmission in the future.

When a short-circuit fault occurs in the power grid, induction motors in the distribution network will contribute to the short-circuit current. Accurate short-circuit current calculation of the motors requires detailed modeling of distribution network. This method is not suitable for large-scale power grid. In this paper, an equivalent modeling method of induction motor contribution to short-circuit current is proposed, which is suitable for large-scale grid calculation and without changing the basic algorithm of short-circuit current or the basic data structure of electromechanical transient. An example of Central China Power Grid is shown, and the accuracy of the proposed method is verified by actual fault inversion.

局部区域内的新能源大规模集中开发会造成严重的弃电问题,配置一定规模的储能装置可显著减少弃电.文中基于时序生产模拟软件和概率统计分析方法研究了考虑新能源发电不确定性和弃电率约束的局部断面储能容量配置问题.首先,介绍了主流的时序生产模拟软件的算法框架;基于该软件在考虑新能源出力的不确定性下获取局部区域断面的弃电曲线.然后,考虑弃电率限制,利用恒功率法确定储能的初始配置规模,再对断面弃电时长进行累积概率统计分析以得到储能最佳时长;进而对储能进行优化配置,得到满足弃电率约束的储能最佳配置规模.最后,针对中国西北某省实际电网进行了算例分析,并对储能配置规模与新能源装机占比和新能源利用率开展敏感性分析,验证了所提方法在求解方面的便捷性.

新能源的快速发展,给系统带来调峰困难、抗扰动能力下降等问题.为了支撑新能源合理规划建议,亟需评估电网能承载的新能源上限.该文结合西北电网能源结构和网架特点,梳理新能源开发和直流外送规模研究的思路框架;推导考虑频率安全约束的高比例新能源系统指标,包括一次调频容量与稳态频率偏差、频率响应特性与暂态频率偏差和直流送出规模与系统惯量指标;建立基于生产模拟结果的频率安全仿真算法.结合"十四五"规划边界条件,研究提出西北电网新能源开发及直流外送建议规模,验证了该文所提方法的有效性和工程实用性.

China has set a goal of reaching a carbon peak by 2030 and becoming carbon neutral by 2060. Based on the 2050 global energy interconnection (GEI) scenario and backbone grid plan, such issues in the construction of the GEI as high proportion of clean energy, connecting pattern and grid structure, operation control measures, etc. were studied. The proportions of clean energy, implementation path and responding measures to challenges were analysed, the concept of multi-node and multi-loop generalized backbone grid were proposed. The hierarchical and zoning structure was discussed, and intelligent dispatching, stability control, information communication and big data and other operational control measures were proposed. Key technologies such as large-capacity long-distance power transmission, cross-sea power transmission, clean energy power generation, and energy storage were analysed and predicted.

In order to study the energy situation more accurately and formulate energy policies scientifically in the process of energy transition, this paper analyzed the European Union (EU) energy and power policy, which provides reference for our country to make energy policy. Firstly, the energy policies of EU including Energy Package, 2030 Climate-energy Package and Strategic Energy Technology Plan were summarized. Secondly, the relationship between ten-year network development plan and the transmission part of roadmap were studied. At last, the key technologies related to future DC transmission were prospected. According to the analysis, this paper presents that the main implication of EU policy on Chinese energy and electrical policy is as follows: legislation should be done first, the effect of revolutionary technology on load forecasting should be considered, and the technical reserve of DC transmission should be strengthened.

伴随国家电网公司对富余可再生能源跨省区消纳的大力推进,受端电网接纳能力的精细化评估分析成为跨省区新能源消纳的核心问题,对此,基于三公调度模式下的安全约束经济调度优化技术,提出了采用多级协同方案的受端电网接纳能力评估分析方法.该方法构建了省级电网接纳能力评估分析、分中心接纳能力安全校核与校正和多回直流通道接纳能力评估分析模型.首先执行省级电网接纳能力评估分析,为分中心接纳能力评估分析提供边界条件.然后对分中心全网、单回直流通道或多回直流通道进行接纳能力有效性评估和安全校正,为国调中心跨省区现货交易出清提供可靠的边界条件.经过多场景算例和实用化运行的分析与验证,结果表明该方法可准确分析分中心全网、单回直流通道或多回直流通道等不同维度的新能源消纳能力,为跨省区现货交易的顺利进行提供了技术保障,实现了富余可再生能源跨省区最大消纳.

连锁换相失败是交直流混联电网的新型连锁故障形式之一.结合连锁关系在换相失败相关现象中的体现和参与环节,文中提出了一种在关键线路短时调节阻抗以降低耦合的抑制策略,重点讨论了策略的实施位置.在加权网络模型的基础上,基于直流分群界定了换相失败的连锁范围.在直流群内搜索对直流耦合关系影响较大的关键路径,并采用潮流介数比较各线路阻抗变化对系统运行状态的冲击,以避免在重要线路采取措施.针对不同的扰动,利用换相电压时间面积判断需要启动策略的直流群,从而实现有差别的连锁换相失败抑制.在修改的IEEE 39节点系统和某省市电网算例中,利用PSCAD/EMTDC开展仿真,结果均验证了关键线路阻抗短时调节策略抑制连锁换相失败的效率和有效性.

With an increasing number of distributed renewable resources integrated into power grid, the nature of non-convexity in the electricity market is getting more and more notable. Since the traditional locational marginal pricing scheme fails to reflect the fixed cost of resources, the market operator has been forced to provide uplift payments to loss making or loss-opportunity generators. This paper seeks to research an extended locational pricing scheme to reduce the uplift cost. Firstly, by overviewing the market clearing processes under LMP scheme, the demerits of LMP method are discussed when the incentive compatibility cannot be satisfied. After analyzing the reasons for uplift cost, the model of convex hull pricing is established. Finally numerical results of test cases prove the correctness of the assertion that the extended locational pricing scheme can actually reduce the uplift payments, which is of great significant for the transparency of electricity market.

With the rapid development of ultra-high voltage AC and DC power supply and the increase of large-capacity power bases, China’s power system shows obvious integration characteristics of power balance in the whole power grid, which poses new challenges to the existing model of scheduling plan with provincial balance and weakly coupled dispatching at all levels. For this reason, an integrated optimization model of power generation and transmission planning for the entire power grid is proposed, which is suitable for engineering practice and takes into account the characteristics of multi-energy generation complementation on the generation side, transmission operation characteristics of ultra-high voltage lines and flexible load response characteristics on the demand side. The model of multi-energy complementation of generation side is established, which can reduce the fluctuation of clean energy and increase the accommodation of clean energy. The flexible load response model of the demand side is established, which can coordinate with the power adjustment of the power generation to increase the accommodation space of clean energy. The power model of transmission channel is established to connect the energy base with the load center, which can consider the distribution characteristics of the power grid globally and reduce the overall operation cost of the grid. Based on the actual data of a cross-regional interconnected power grid, the validity of the model is verified.

新能源贡献短路电流的特征与传统电机存在显著区别,随着高比例新能源集中接入电网,其贡献短路电流的计算方法受到重点关注.该文研究了双馈风力发电机贡献短路电流的机理,建立双馈风力发电机组的矢量控制电磁暂态模型,针对机端电压轻微跌落和严重跌落2种工况,分别考虑变流器持续励磁控制和Crowbar电阻投入控制2种策略,推导了双馈风机的转子电流和定子电流表达式.结合故障后电气边界条件改变,双馈风机从变流器持续励磁控制切换至Crowbar投入控制,推导计及控制策略切换过程的短路电流解析式,提出一种考虑控制切换过程的双馈风电机组短路电流计算方法.通过与PSCAD的仿真结果分析对比,验证了理论分析的正确性并分析控制策略切换过程对短路电流的影响,所提方法推进了新能源贡献短路电流的机理研究,有利于提升短路电流的计算精度.

随着新能源在电力系统中占比不断增加、接入形式的多样化,局部地区出现了新能源并入弱交流电网的场景,这是出现宽频带振荡、过电压等问题的影响因素之一,因此,亟需提出理论科学、工程实用的新能源接入规模的量化评估指标.该文首先基于短路比的物理本质,提出计及场站间相互影响的新能源多场站短路比(multiple renewable energy stations short circuit ratio,MRSCR)定义及计算方法,并根据系统阻抗比与短路比间的关联关系,给出针对不同阻抗比范围的计算解析表达式.其次,对新能源多场站临界短路比进行定性分析,并基于典型电网参数计算结果从工程应用的角度提出MRSCR临界指标.最后,依托电力系统分析综合程序(power system analysis synthesis program,PSASP)开发MRSCR计算模块,通过时域仿真算例验证所提出MRSCR对多新能源场站接入系统电压强度表征作用的有效性.