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Study on Measures to Improve the PV Hosting Capacity of Tibet Power Grid 提高西藏电网光伏承载能力的措施研究
Pub Date : 2018-11-01 DOI: 10.1109/POWERCON.2018.8602011
Zaihua Li, Haibin Gao, Chao Zheng, Cuomu, S. Lv, Boqi Zhang, Yan Mei, Zhanfeng Chen, Danzengduoji, Hongcheng Zhao
Measures to improve the solar PV hosting capacity of Tibet power grid are studied. The industrial foundation of Tibet autonomous region is less developed, its load level is rather low, the power grid structure is relatively weak, and the power source mainly includes hydropower and photovoltaic, the peak regulating capacity is very limited. Therefore, its PV hosting capacity is inadequate and solar light discard rate is somewhat high (more than 30 percent often). How to improve the PV hosting capacity of Tibet power grid is an urgent problem. The main characteristics of Tibet power grid include: large capacity generator within small power system, strong DC coexists with weak AC, grid structure is rather weak. Most of the power sources in Tibet are hydropower. The proportion of PV installed is large, and the proportion of thermal power is very small and only used for peak load regulation, and they are cold standby generators. The daily peak load in Tibet appears at night, and the yearly maximum load is in winter. Therefore, Tibet power grid needs a lot of incoming power in winter while the solar light discard rate is rather high in summer. In normal operation mode, the PV outputs are limited seriously, but the capability of PV power generation to participate in frequency adjustment, to support the transient stability and voltage stability of the power grid has not been developed. According to the characteristics of Tibet power grid, three measures to improve the PV hosting capacity of Tibet power grid are studied, includes:1)Improving the active power control of the PV power station.2)Realizing globally reactive power optimized coordination control by coordinated control of reactive power compensation equipment.3)Improving the generator-grid coordination performance by changing the related parameter settings. Related control models are built, the simulation calculations results show that the above three kinds of measures can effectively improve the PV hosting capacity of Tibet power grid, the three measures have their application value respectively and can be used in combination.
研究了提高西藏电网太阳能光伏装机容量的措施。西藏自治区工业基础欠发达,负荷水平较低,电网结构相对薄弱,电源以水电和光伏为主,调峰能力十分有限。因此,其光伏发电容量不足,太阳能弃光率有些高(通常超过30%)。如何提高西藏电网的光伏承载能力是一个亟待解决的问题。西藏电网的主要特点是:小电力系统内有大容量发电机,强直流与弱交流并存,电网结构较为薄弱。西藏大部分的电力来源是水力发电。光伏装机占比大,火电占比很小,只用于调峰,属于冷备用发电机。西藏的日负荷高峰出现在夜间,年最大负荷出现在冬季。因此,西藏电网在冬季需要大量的输入电力,而在夏季太阳能弃光率很高。在正常运行模式下,光伏发电出力严重受限,但光伏发电参与调频、支持电网暂态稳定和电压稳定的能力尚未发展起来。根据西藏电网的特点,研究了提高西藏电网PV承载能力的三种措施,包括:1)改进光伏电站的有功控制;2)通过无功补偿设备的协调控制实现全局无功优化协调控制;3)通过改变相关参数设置来改善发电电网的协调性能。建立了相关的控制模型,仿真计算结果表明,上述三种措施均能有效提高西藏电网的光伏承载能力,三种措施各有应用价值,可以组合使用。
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引用次数: 0
CCHP Capacity Optimization with User Demand Characteristics 具有用户需求特征的CCHP容量优化
Pub Date : 2018-11-01 DOI: 10.1109/POWERCON.2018.8602112
Weixing Zhao, Qingyang Liao, Wei Xie, Zeyu Zou, Dongjie Xu, Wenze Liu
Under the background of scarcity of fossil fuels and serious environmental pollution, in order to give a full play to the advantages of tri-generation system, a configuration scheme of a Combined Cooling Heating Power (CCHP) system is provided, which adjusts to local conditions and user’s demand. Firstly, a model of the CCHP system is designed to describe the relationship of energy inputs and multiple outputs, which is connected with power grid and natural gas, and providing electricity, heat water and cool water. Then, on the basis of the proposed mathematical model of CCHP, multi-objective optimization model is put forward to allocate the CCHP capacity, which is focused on the maximum purpose of environmental and economic benefits. The optimal configuration model is supposed to meet the energy balance constraints, equipment capacity constraints and equipment operation constraints. Genetic algorithm NSGA-II is used to solve the optimization model to achieve the goal. Finally, taking the large-scale park of the Gui’an Tongji Hospital as an example, the capacity allocation scheme of the CCHP system in one specific zone is given.
在化石燃料紧缺、环境污染严重的背景下,为了充分发挥三电联产系统的优势,提出了一种因地制宜、适应用户需求的冷热联产系统配置方案。首先,设计了热电联产系统的模型,描述了该系统的能量输入和多输出关系,该系统与电网和天然气相连,提供电力、热水和冷水。然后,在提出的热电联产数学模型的基础上,以环境效益和经济效益最大化为目标,提出了热电联产容量配置的多目标优化模型。最优配置模型应满足能量平衡约束、设备容量约束和设备运行约束。采用遗传算法NSGA-II对优化模型进行求解,实现目标。最后,以贵安同济医院大型园区为例,给出了某一特定区域的热电联产系统容量分配方案。
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引用次数: 1
Optimized Coordinated Control Strategy of Assembly HVDC Breakers for MMC Based HVDC Grids 基于MMC的直流电网组合断路器优化协调控制策略
Pub Date : 2018-11-01 DOI: 10.1109/POWERCON.2018.8602295
Gaoren Liu, F. Xu, Yuzhi Zhou
The assembly HVDC breaker (ASCB) can handle the dc-side fault efficiently. To overcome the shortcomings of the traditional strategy, two coordinated control strategies are proposed. The main idea is adopting the overcurrent in the dc-side as the criterion of pre-operation, and the ASCB will close in advance when it is satisfied. In the proposed strategies, the current that flows through the main breaker will be reduced, as well as the injecting current towards the ASCB from neighboring converters. The simulation result shows that the strategy is valid and feasible.
组合式直流断路器(ASCB)能有效地处理直流侧故障。针对传统控制策略的不足,提出了两种协调控制策略。其主要思想是采用直流侧过流作为预操作的判据,满足过流时ASCB提前合闸。在提出的策略中,流经主断路器的电流将被减少,以及从邻近变流器向ASCB注入的电流。仿真结果表明了该策略的有效性和可行性。
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引用次数: 3
The direct power transaction model between provinces considering the safety constraints and transmission loss 考虑安全约束和输电损耗的省际电力直接交易模型
Pub Date : 2018-11-01 DOI: 10.1109/POWERCON.2018.8601707
Ying Ding, Lin Li, B. Sui
The reverse distribution of energy supply and demand has caused the serious problem of power supply and demand, and the direct power transaction between provinces can make full use of the inter-provincial power transmission channels to ease the problem. However, the market members participating in the direct power transaction between provinces have great differences in geographies, and the transmission loss caused by differences should not be neglected. When dealing with the direct power transaction between provinces, we do not consider the impact of transmission loss, which greatly brings on unfair trading in the market. This paper builds a direct power transaction model between provinces considering the safety constraints and transmission loss. Considering the multiple operation modes of power grid, the model puts forward the measurement method of transmission loss and studies the ordering rule of direct power transaction between provinces. The rule considers the impact of transmission loss under the premise of giving priority to prices and giving priority to energy conservation and environmental protection. The model promotes the refinement of trading methods and maintains the fairness of transactions in power market. The result is relatively stable and can be used as empirical data for practical application. The model provides decision support for the interaction between supply and demand in the power market and the optimal allocation of resources in large area.
能源供需的反向分布造成了严重的电力供需问题,而省际电力直接交易可以充分利用省际输电通道来缓解这一问题。然而,参与省际电力直接交易的市场成员在地域上存在较大差异,差异造成的输电损失不容忽视。在处理省际电力直接交易时,没有考虑传输损耗的影响,这在很大程度上造成了市场交易的不公平。本文建立了考虑安全约束和输电损耗的省际电力直接交易模型。该模型考虑了电网的多种运行方式,提出了输电损耗的测量方法,研究了省际电力直接交易的排序规则。规则在价格优先、节能环保优先的前提下,考虑输电损耗的影响。该模型促进了交易方式的精细化,维护了电力市场交易的公平性。所得结果较为稳定,可作为实际应用的经验数据。该模型为电力市场供需关系的相互作用和大范围内资源的优化配置提供决策支持。
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引用次数: 1
Research on the Influence of Humidity on Heating and Discharge Characteristics of Polluted Zero-value Insulator 湿度对污染零值绝缘子加热和放电特性影响的研究
Pub Date : 2018-11-01 DOI: 10.1109/POWERCON.2018.8602167
Shenghui Wang, H. Li, L. Niu
In order to study the influence of pollution on the heating and discharge characteristics of zero-value insulator and insulator string, infrared and ultraviolet imaging method were used in the experiment. Using the highest temperature and spot sequence of the insulator, with the pollution in dry and moist condition, the effect of the salt density and position of the zero-value insulator in the insulator string on the heating and discharging characteristics was analyzed. The ANSYS was used to simulate the electric and thermal field of the polluted insulator. Analysis of ANSYS simulation results under experimental conditions was consistent with the experimental results.
为了研究污染对零值绝缘子和绝缘子串加热和放电特性的影响,实验中采用了红外和紫外成像方法。利用绝缘子的最高温度和斑点顺序,在干湿污染条件下,分析了盐密度和零值绝缘子在绝缘子串中的位置对加热和放电特性的影响。利用ANSYS软件对污染绝缘子的电场和热场进行了模拟。实验条件下ANSYS仿真分析结果与实验结果一致。
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引用次数: 1
Selective Protection Relaying in the Presence of Distributed Generation and Closed-Ring Structures 分布式电源和闭环结构中继电保护的选择
Pub Date : 2018-11-01 DOI: 10.1109/POWERCON.2018.8602212
M. Biller, J. Jaeger
Adverse effects of high shares of distributed energy resources (DER) in distribution grids, like overvoltage or overloading, can be mitigated by closing open-ring structures. In order to obtain acceptable selectivity in case of faults on these closed-ring structures, an additional protection relay in the coupling point (“coupling relay is beneficial. If the coupling relay (CR) is a conventional overcurrent or distance relay, it suffers from shortcomings like a highly reduced reach towards the substation caused by the necessity to discriminate low fault currents against high currents in non-faulty operation states. Furthermore, DER fault current contributions may lead to sympathetic tripping of the CR in case of faults on adjacent feeders. The proposed CR approach overcomes those challenges by using a negative-sequence reactance criterion. The method’s reactance results are not disturbed by phenomena like fault resistance or variable DER infeed. There is no risk of sympathetic tripping and the CR can be properly coordinated with other protection relays on spur feeders of the ring. This is achieved without communication channels between the CR and other relays or DERs. The approach is validated by simulations of a typical German 20-kV-distribution grid using PSS® Sincal.
配电网中分布式能源(DER)的高份额的不利影响,如过电压或过载,可以通过关闭开环结构来减轻。为了在这些闭合环结构的故障情况下获得可接受的选择性,在耦合点(“耦合继电器”)额外的保护继电器是有益的。如果耦合继电器(CR)是传统的过流或距离继电器,则存在一些缺点,例如由于必须在非故障运行状态下区分低故障电流和大电流而导致对变电站的到达高度减少。此外,如果相邻馈线发生故障,DER故障电流贡献可能导致CR共感跳闸。提出的CR方法通过使用负序电抗判据克服了这些挑战。该方法得到的电抗结果不受故障电阻或进给DER变等现象的干扰。没有交感跳闸的风险,CR可以与环的直馈线上的其他保护继电器适当协调。这是在CR和其他继电器或der之间没有通信通道的情况下实现的。该方法通过使用PSS®Sincal对典型的德国20kv配电网进行模拟验证。
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引用次数: 2
A collaborative planning method for regional energy network 区域能源网络协同规划方法
Pub Date : 2018-11-01 DOI: 10.1109/POWERCON.2018.8602273
Chai Yufeng, Xuan Ke, Yao Cheng, Zhang Yu, Wang Yang, Zhu Xu
Single user based distributed energy system limits the economical use of energy, but this limitation can be solved with the energy network. This planning method sets up the model, which aims to reduce the annual cost (includes the costs of equipment, operation, maintenance, fuels and carbon tax) to complete the optimization of device configuration. A mixed integer linear programming model is established to determine the energy system combination, develop running strategy and build the energy transmission network. Compared with nonlinear model, under the premise that various factors are considered, the difficulty of solving the programming problem is reduced in this paper. Finally, this paper solves the model with actual data. By comparing the planning results with traditional energy supply mode, the feasibility of the method and the economy of the regional energy network are verified.
基于单用户的分布式能源系统限制了能源的经济利用,但这一限制可以通过能源网络来解决。该规划方法建立模型,以降低年度成本(包括设备成本、运行成本、维护成本、燃料成本和碳税)为目标,完成设备配置的优化。建立混合整数线性规划模型,确定能源系统组合,制定运行策略,构建能源输送网络。与非线性模型相比,在考虑多种因素的前提下,降低了求解规划问题的难度。最后,结合实际数据对模型进行求解。将规划结果与传统的能源供应模式进行比较,验证了该方法的可行性和区域能源网络的经济性。
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引用次数: 2
Conceptual Design and Study of a 1GW VSC-HVDC Converter Platform for Offshore Wind Farm Connection 海上风电场连接1GW vdc - hvdc变换器平台概念设计与研究
Pub Date : 2018-11-01 DOI: 10.1109/powercon.2018.8601569
Lan Yuanliang, L. Duo, Lan Tian, Wu Xiang, Y. Hang, W. Xuejun, Lei Xianzhang
In this paper, the current status of large-scale Offshore Wind Farm connection using VSC-HVDC converter platform is firstly investigated. Secondly, the conceptual design of a 1 GW VSC-HVDC converter platform is analyzed with respect to the main electrical circuit and topside and foundation structure. In the end, a hydrodynamic and structural finite element analysis is performed to establish the necessary structural dimensions of the topside, jacket structure, and piles. Basic loads, ultimate limit state(ULS), fatigue limit state(FLS), and float over installation of structural performance are also addressed.
本文首先对大型海上风电场采用VSC-HVDC变换器平台连接的现状进行了研究。其次,从主电路、上部结构和基础结构等方面分析了1gw直流直流变换器平台的概念设计。最后,进行水动力和结构有限元分析,以确定上层甲板、导管架结构和桩的必要结构尺寸。基本载荷,极限状态(ULS),疲劳极限状态(FLS)和浮子安装结构性能也进行了讨论。
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引用次数: 0
Study on Coordinated Control Strategy of Reactive Power Compensation Device in DC Converter Station with New-generation Synchronous Condensers 新一代同步冷凝器直流换流站无功补偿装置协调控制策略研究
Pub Date : 2018-11-01 DOI: 10.1109/POWERCON.2018.8602002
Xiao Fan, Zhou You-bin, R. Lin, Zhou Kunpeng, W. Tao, Cao Kan
In order to meet the higher demand of dynamic reactive power support is put forward in the UHV DC power transmission project, the new-generation synchronous condensers are applied in the UHV DC/AC. However, the excitation system of the new-generation synchronous condensers and the reactive power compensation device of the DC converter station are controlled individually, and there is no reasonable coordination strategy. Therefore, the transient reactive power support capability of the synchronous condenser is analyzed in this paper considering with excitation control characteristics. Then, the transient reactive power demand of the HVDC transmission system is also analyzed. Based on this, the coordinated control strategy of the reactive power compensation device in DC converter station with synchronous condensers are proposed, and a coordinated control system is given in this paper. Finally, the simulation model of the new-generation synchronous condensers access to UHV DC power grids are built based on the PSCAD software. The digital simulation results validate the proposed coordinated control strategy.
为满足特高压直流输电工程对动态无功支持提出的更高要求,在特高压直流/交流中应用了新一代同步电容器。但新一代同步凝汽器励磁系统与直流换流站无功补偿装置是单独控制的,没有合理的协调策略。因此,本文在考虑励磁控制特性的情况下,对同步电容器的暂态无功支撑能力进行了分析。然后,对直流输电系统的暂态无功需求进行了分析。在此基础上,提出了带同步凝汽器的直流换流站无功补偿装置的协调控制策略,并给出了协调控制系统。最后,基于PSCAD软件建立了新一代同步冷凝器接入特高压直流电网的仿真模型。数字仿真结果验证了所提出的协调控制策略。
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引用次数: 8
Engineering Simulation Analysis and Demonstration Application of Multi-terminal DC Distribution System 多端子直流配电系统工程仿真分析及示范应用
Pub Date : 2018-11-01 DOI: 10.1109/POWERCON.2018.8602034
Chen Liang, Jiang Mengmeng, H. Qiang, Y. Xiaodong, Luo Fei
Based on the background of DC normal education project in the Jinji Lake core area of Suzhou Industrial Park, this paper discusses the key technologies in the practice of multi-terminal DC power distribution technology engineering. Firstly, the basic situation of Suzhou four-terminal DC project was outlined, and the key electrical equipment and its selection principle were analyzed, including the converter valves, bridge arm reactors, link transformers, and DC monitoring and protection systems. Secondly, based on the RTLAB real-time simulation platform, the simulation model of Suzhou four-terminal DC distribution system was built. Finally, based on the RTLAB simulation model, single-ended converter startup, four-terminal stable operation, active power step and reactive power step were simulated. The simulation results show that the four-terminal DC grid model has good steady state performance and active power and reactive power step response performance. It can provide reference for the future DC distribution network construction.
本文以苏州工业园区金鸡湖核心区直流师范教育项目为背景,对多端子直流配电技术工程实践中的关键技术进行了探讨。首先概述了苏州四端直流工程的基本情况,分析了其中的关键电气设备,包括换流阀、桥臂电抗器、链路变压器、直流监控与保护系统及其选型原则。其次,基于RTLAB实时仿真平台,建立苏州市四端直流配电系统仿真模型。最后,基于RTLAB仿真模型,对单端变流器启动、四端稳定运行、有功功率阶跃和无功功率阶跃进行了仿真。仿真结果表明,该四端直流电网模型具有良好的稳态性能和有功、无功阶跃响应性能。为今后的直流配电网建设提供参考。
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引用次数: 0
期刊
2018 International Conference on Power System Technology (POWERCON)
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