Enhancing Autonomy Capability in Regional Power Grids:A Strategic Planning Approach with Multiple Autonomous Evaluation Indexes

After the integration of large-scale DistributedGeneration(DG)into the distribution network,the randomness and volatility of its output result in a reduction of spatiotemporal alignment between power generation and demand in the distribution network,exacerbating the phenomenon of wind and solar power wastage.As a novel power system model,the fundamental concept of Regional Autonomous Power Grids(RAPGs)is to achieve localized management and energy autonomy,thereby facilitating the effective consumption of DGs.Therefore,this paper proposes a distributed resource planning strategy that enhances the autonomy capabilities of regional power grids by considering multiple evaluation indexes for autonomy.First,a regional Energy Storage(ES)configuration strategy is proposed.This strategy can select a suitable reference value for the upper limit of ES configuration based on the regional load andDGoutput to maximize the elimination of source load deviations in the region as the upper limit constraint of ES capacity.Then,a control strategy for regional ES is proposed,the charging and discharging reference line of ES is set,and multiple autonomy and economic indexes are used as objective functions to select different proportions of ES to control the distributed resources of the regional power grid and establish evaluation indexes of the internal regional generation and load power ratio,the proportion of power supply matching hours,new energy consumption rate and tie line power imbalance outside the region to evaluate changes in the regional autonomy capabilities.The final simulation results showthat in the real regional grid example,the planning method in the planning year in the region of the overall power supply matching hour ratio and new energy consumption rate increased by 3.9%and 4.8%on average,and the power imbalance of the tie line decreased by 7.8%on average.The proposed planning approach enables the maximization of regional autonomy while effectively smoothing the fluctuation of power exchange between the regional grid and the higher-level grid.This presents a rational and effective planning solution for the regional grid,facilitating the coordinated development between the region and the distribution network.

Practice and Thinking on Current Planning Environmental Impact Assessment of Transmission and Transformation Power Grid in Jiangsu Province

The planning environmental impact assessment （EIA） of transmission and transformation power grid at levels of 500 and 220 kV had been finished completely in the 13 municipalities of Jiangsu Province by the end of 2012, which played important roles in guiding and planning the following transmission and transformation projects in environmental protection. In this paper, through the detail analysis on the objective and significance of the planning EIA of transmission and transformation power grid, legal basis and planning EIA practices, some suggestions and thinking about the planning EIA of transmission and transformation power grid were put forward.

Multi-stage power source and grid coordination planning method considering grid uniformity

Given the increasing uncertainties in power supply and load,this paper proposes the concept of power source and grid coordination uniformity planning.In this approach,the standard deviation of the transmission line load rate is considered as the uniformity evaluation index for power source and grid planning.A multi-stage and multi-objective optimization model of the power source and grid expansion planning is established to minimize the comprehensive cost of the entire planning cycle.In this study,the improved particle swarm optimization algorithm and genetic algorithm are combined to solve the model,thus improving the efficiency and accuracy of the solution.The analysis of a simple IEEE Garver’s 6-node system shows that the model and solution method are effective and feasible.Moreover,they are suitable for the coordinated planning of the power source and grid under a diversified nature of power supply and load.

Research on Grid Planning of Dual Power Distribution Network Based on Parallel Ant Colony Optimization Algorithm

A distribution network plays an extremely important role in the safe and efficient operation of a power grid.As the core part of a power grid’s operation,a distribution network will have a significant impact on the safety and reliability of residential electricity consumption.it is necessary to actively plan and modify the distribution network’s structure in the power grid,improve the quality of the distribution network,and optimize the planning of the distribution network,so that the network can be fully utilized to meet the needs of electricity consumption.In this paper,a distribution network grid planning algorithm based on the reliability of electricity consumption was completed using ant colony algorithm.For the distribution network structure planning of dual power sources,the parallel ant colony algorithm was used to prove that the premise of parallelism is the interactive process of ant colonies,and the dual power distribution network structure model is established based on the principle of the lowest cost.The artificial ants in the algorithm were compared with real ants in nature,and the basic steps and working principle of the ant colony optimization algorithm was studied with the help of the travelling salesman problem(TSP).Then,the limitations of the ant colony algorithm were analyzed,and an improvement strategy was proposed by using python for digital simulation.The results demonstrated the reliability of model-building and algorithm improvement.

Practice and Thinking of Plan Environmental Impact Assessment of Power Transmission and Transformation Grid in Nanjing

At present,the plan environmental impact assessment of power transmission and transformation grid is relatively mature. How to further improve the quality of plan environmental impact assessment of power grid during the "14^(th) Five-Year Plan" period is very important. In this paper,the plan environmental impact assessment of power grid in the Development Plan for Power Grid in Nanjing during the "13^(th) Five-Year Plan" Period is studied to further discuss the ideas,evaluation system and content framework of plan environmental impact assessment of power grid.

Research Reports on the 12^(th) Five-Year Plan for Electric Power Industry Power Grids

China Electricity Council organized competent authorities across the industry of electric power to work out the ＂Research Reports on the 12^th Five-Year Plan for Electric＂ Power lndustry ＂＂ in nearly one year, which provides a reference/or governmental departments to formulate the 12^th Five-Year Plan on energy and electric power industry. The magazine should publish the serial reports inchliding power sources, power grids, equipment manufacture, energy and environment, and power economics. This paper presents the part of ＂ power grids, ＂ in which the strategies of developing power grids are put forward.

Problems of Planning for Power Industry in China

On the basis of summing up the development of electric power industry in the 10th Five-Year Plan period, the idea of electric power development planning from 2006 to 2020 is presented. The authors analyzed ten main problems that existed in electric development during the 10th Five-Year Plan period, forecasted the electricity generation from 2006 to 2020, put forward the development strategy of power industry, discussed the component and development program of hydropower, thermal power, nuclear power, natural gas power and renewable power, outlined the present situations of six regional power grids, power transmission from western to eastern regions, UHV AC/DC power transmission and nationwide power grid interconnections, and finally gave out seven suggestions about electric power development in the future.

Development and Prospect of China Power Grids

In this paper the growing process of China power grid from formation of local power grids to nationwide interconnection is reviewed. The scale and structure of power grid construction in the near future, especially the planning on sending power from west to east, North-South supplementation and nationwide interconnection are introduced. In addition, the technologies to be extended in future grid development are briefed, such as HVDC, FACTS and compact transmission line, etc.

Research on Safety and Stability of Regional Power Grids to the Year 2020

The safety and stability study on Northeast, North, East, Northwest and Central China power grids had been carried out, which provided technical supports to planning design of regional power grids. By analyzing safety and stability under severe faults in regional power grids, revealed weaknesses on power grid configurations and measures for preventing from loss of stability were presented. In comparison of various schemes of power system safety and stability among parts of power grids, more than two recommended schemes can be chosen as reference in planning design for regional power grids. Considering the safety and stability control measures necessary for each power grids, it is believed the trunk networks of all power grids can fulfill the third criteria of Guideline for Power System Safety and Stability, while the weakness and predominated hydropower may deteriorate safety and stability of power grids. The power grid shall be regulated in line with the variation of boundary conditions.

An Outlook on Northwest Power Grid Development

In this paper the basic situation of the Northwest Region in China is introduced, the necessity for the Northwest Power Grid to develop 750 kV transmission line is analyzed, and the target for the power grid construction till 2010 as well as the planning for sending power from west to east and interconnection with adjacent grids are described.

Analysis on Regional Power Grid Load Characteristics and Rational Allocation of Capacity Load Ratio

The reasonability of the adopted capacity load ratio numerical value in urban power grid planning determines the economy of planning level yearly power grid.Too large capacity load ratio will result in the increasing investment in the early period of power grid construction, however, too small capacity load ratio will make the power grid have poor adaptability, affecting the power supply. Reasonably determining the adopted regional power grid capacity load ratio quantitative numerical value in planning has a strong guiding significance for constructing reliable and economic power grid and preventing power grid from excessive advance or lagging behind the load development. This paper, through the statistics and analysis of a certain regional power grid 2010-2012 three years＇ power grid daily load characteristics and the investment benefit evaluation of three years＇ 220KV power grid individual project, makes a preliminary analysis and puts forwards the specific advice on the reasonable values of power ~rid 35-220KV power transformation capacity load ratio.

基于逐步倒推法结合MATPOWER潮流计算的地市级电网网架规划方法

文章介绍了一种基于逐步倒推法结合MATPOWER潮流计算的地市级电网网架规划方法,并利用该方法对2015年荆门市电网220kV主网架进行规划分析,实践证明该方法具可行性。

基于误差幅空特性分析的空间负荷预测误差评价方法

对空间负荷预测误差进行有效评价是客观认识预测结果,指导预测结果合理应用的前提。然而,现有空间负荷预测误差评价的研究存在对误差的空间分布不考虑或考虑不充分导致评价不准确的问题。为此,提出一种基于误差幅空特性分析的空间负荷预测误差评价方法。首先,从空间负荷预测误差幅值大小和空间分布对电网规划影响的角度出发,对误差的幅空特性进行详细分析;其次,利用运输问题的数学模型来表征正负误差的幅空抵消特性,使用各空间邻近度–幅值误差值曲线与x轴围成面积之和来表征剩余未抵消误差的幅空叠加特性;然后,分别通过伏格尔法和各梯形面积累加公式来计算正负误差的幅空抵消影响值和剩余未抵消误差的幅空叠加影响值,并在此基础上构建空间负荷预测误差评价指标;最后,基于误差对电网规划的实际影响给出对误差评价指标性能的检验方法。算例分析表明,与传统方法相比,该文所提误差评价方法从幅值和空间两个维度实现了对空间负荷预测误差更为全面的评估,与误差对电网规划影响的实际情况贴近度更高。

风电数据的不确定性建模及在电网规划的应用

在我国经济高速发展的同时,矿物资源的使用持续增长,对环境的污染也在不断加剧,发展风力发电是我国实现低碳转型的一项重要措施。然而,由于风力发电具有较强的不稳定性,这给电网的运行带来了较大的不确定性。因此,考虑风力发电过程中的不确定性因素,并对其进行建模,开展含风力发电的电网规划研究。首先对风电出力的不确定性进行建模,建立了风电机组出力的数学模型。其次,提出了以总成本、总网损最小为目标函数的考虑风电不确定性的最优潮流模型,并给出一种采用局部模型并引入动态惯性权重系数改进的粒子群优化求解算法。经采用实际的风电数据进行实验,结果表明与传统的粒子群优化算法相比,改进的粒子群优化算法在求解速度、收敛性以及稳健性方面均具有更优性能。

基于灵敏度因子的随机电网规划方法

针对常规电网规划考虑系统灵活性不足的问题,建立多场景的不确定电网规划模型,该模型以设备投资成本和运行费用综合最小为目标,嵌入安全约束机组组合模型以充分反映系统灵活性的平衡;同时,鉴于常规电网规划模型规模过大,计算效率低下,提出一种基于灵敏度因子的电网规划方法,建立候选线路投建状态变量对输电断面约束的灵敏度模型,消除传统电网规划中的节点相角变量,实现线路和断面潮流的解耦,从而大幅提高电网规划求解效率。IEEE 118节点算例和实际电网算例的结果表明:对新能源消纳率的过高追求可能会导致巨大电网投资成本;同时,在中大型电力系统中,基于灵敏度因子的电网规划计算效率优势明显,从而验证模型和算法的有效性。

考虑碳捕集电厂运行灵活性的网-储联合规划

碳捕集电厂(carbon capture power plant,CCPP)在降低碳排放的同时,增强了电力系统的灵活性,是促进可再生能源消纳和低碳化转型的关键。考虑CCPP运行的灵活性,提出一种网‒储联合规划方法。针对海量场景规划计算困难的问题,利用改进k-means算法对风电出力场景进行削减,并基于Spearman系数筛选典型出力场景。分析CCPP的灵活性运行机理,构建电力系统灵活性供给模型和量化指标。建立考虑CCPP的网‒储双层优化模型,在规划层中确定输电线路和储能的配置方案,并在运行层中考虑CCPP的灵活性。以改进IEEE RTS-24节点系统为算例进行分析,结果表明:所提规划方法能够提高电力系统的灵活性裕度,降低输电线路和储能的投资成本。研究结果证明了所提规划方法的有效性。

农村配电网的规划策略分析

阐述农村配电网规划建设的特征、问题及原因,提出改进建议,包括合理规划农村电网结构、加快健全农村配电网规划制度与技术导则、加强实地勘测、根据用电需求进行规划设计。

碳管理体系助力宁夏地区电网能源规划和城乡建设——基于国网宁夏电力的研究

我国“双碳”目标的确立对能源规划和清洁能源使用提出新要求,对电力行业而言,既是机遇,也是挑战。电网作为电力系统的枢纽,需要制定合理的碳管理策略,促进电力市场健康、有序发展,助力国家和地方低碳社会建设。文章在总结宁夏地区供能端、输送端和需求端能源规划现状的基础上,有针对性地提出优化策略;并以国网宁夏电力有限公司为例,进一步探索电网企业碳管理体系支撑下高效的低碳发展路径,从电网企业、能源规划及城乡建设三个维度提供可借鉴的经验。研究结果有利于推动电网行业的能源规划优化,助力城乡建设,推进国家和地方碳普惠建设,有效改善人居环境,为可持续绿色城市规划和乡村振兴提供新路径。