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2016 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)最新文献

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Research on evolvement approach of multiple stability forms and AC/DC coordinated control strategy in large power grid 大型电网多种稳定形式演化方法及交直流协调控制策略研究
Pub Date : 2016-10-01 DOI: 10.1109/APPEEC.2016.7779756
Z. Hongli, Fusuo Liu, Li Wei, Xi Li, Ke Xianbo, Weiying Ping
Multiple stability forms such as angle stability, volt-age stability and frequency stability may occur under severe faults in large power grid. In this paper, impacts on the interactive evolvement of multiple stability problems are studied and quantified, which are brought by relevant factors such as the fault severity, load model and DC control mode. In addition, AC/DC coordinated control strategy is proposed under the condition that multiple stability forms coexist on the basis of theoretical analysis, which can get the per unit model of control strategy of generating unit tripping, load shedding, DC modulation, etc, and the method proposed above can enhance the applicability of dealing with multiple stability problems at the same time. Finally, simulation study on the actual electric net-work is presented to verify the effectiveness and advantage of the proposed AC/DC coordinated control strategy.
大型电网在发生严重故障时,可能出现角度稳定、电压稳定、频率稳定等多种稳定形式。本文研究并量化了故障严重程度、负载模型和直流控制方式等相关因素对多个稳定性问题交互演化的影响。此外,在理论分析的基础上,提出了多种稳定形式共存条件下的交直流协调控制策略,得到了发电机组跳闸、减载、直流调制等控制策略的单位模型,提高了同时处理多种稳定问题的适用性。最后,通过对实际电网的仿真研究,验证了所提出的交/直流协调控制策略的有效性和优越性。
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引用次数: 0
A new protection scheme based on distributed decision in smart distribution grid 基于分布式决策的智能配电网保护新方案
Pub Date : 2016-10-01 DOI: 10.1109/APPEEC.2016.7779508
Xin Huang, Qing Chen, Xinyue Si, J. Si
With the development of smart distribution network, the distribution system is introduced with a large number of distributed generations (DGs). It becomes an active network that both the load and fault currents flow two-way, which leads to serious impacts on the protection's selectivity and sensitivity. In this paper, by analyzing current characteristics of a typical distribution network with DGs, a new distributed decision protection method which combines traditional over-current scheme and distributed wide-area protection is proposed. In this method, each line needs to install a smart terminal unit (STU) which obtains local data of current amplitude and direction in real time and processes them into logical values used to realize a specified logical operation. According to local and adjacent STU's calculation results, STUs can judge the fault area without synchronous sampling and isolate the fault by controlling the local protective devices accurately and quickly.
随着智能配电网的发展,配电系统引入了大量分布式代(dg)。负载电流和故障电流双向流动成为一个有源网络,严重影响了保护的选择性和灵敏度。本文通过分析典型配电网络的电流特性,提出了一种将传统过流方案与分布式广域保护相结合的分布式决策保护方法。在这种方法中,每条线路需要安装一个智能终端单元(smart terminal unit, STU),实时获取本地的电流幅度和方向数据,并将其处理成逻辑值,用于实现指定的逻辑操作。根据本地和相邻STU的计算结果,无需同步采样即可判断出故障区域,通过控制本地保护装置准确、快速地隔离故障。
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引用次数: 3
An improved time-domain fault-location algorithm for HVDC transmission line 一种改进的高压直流输电线路时域故障定位算法
Pub Date : 2016-10-01 DOI: 10.1109/APPEEC.2016.7779943
Yingdan Qiu, Haifeng Li, Jiyang Wu, Yanxun Guo, G. Wang
Considering the frequency-dependent characteristics of HVDC transmission line, the error of calculated voltage distribution along the line is analyzed. Based on this, a voltage distribution calculation method using mixed line parameters is developed. Then, given that the voltage distributions of non-fault points calculated at both terminals have the largest difference around the fault time, the maximum voltage difference zone of non-fault points is defined to solve the problem that the difference of voltage distribution along the line change with the fault transient process. Thus, an improved time-domain fault-location algorithm is proposed. Finally, a PSCAD/EMTDC simulation model of one real HVDC project was constructed and extensive simulation results have verified the correctness of the proposed algorithm.
考虑到高压直流输电线路的频率依赖性,分析了计算电压沿线分布的误差。在此基础上,提出了一种基于混合线路参数的电压分布计算方法。然后,考虑到在故障时间前后计算的两端非故障点电压分布差值最大,定义非故障点最大电压差区,解决沿线路电压分布差值随故障暂态过程变化的问题。为此,提出了一种改进的时域故障定位算法。最后,建立了一个实际高压直流工程的PSCAD/EMTDC仿真模型,大量的仿真结果验证了所提算法的正确性。
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引用次数: 1
Performance evaluation of single SVM and LSSVM based forecasting models using price zones analysis 基于价格区域分析的单支持向量机和LSSVM预测模型的性能评价
Pub Date : 2016-10-01 DOI: 10.1109/APPEEC.2016.7779474
Xing Yan, Yonghua Song, N. Chowdhury
According to the current electricity price forecasting studies, it was very difficult to conclude whether support vector machine (SVM) or least squares support vector machine (LSSVM) is more suitable in solving highly non-linear regression problems with very large time horizon such as mid-term electricity market clearing price (MCP) forecasting. In this paper, a detailed evaluation process using price zones analysis technique is applied in evaluating single SVM and single LSSVM based mid-term electricity MCP forecasting models. Based on much more detailed performance evaluation results and consideration of requirements for machine learning techniques utilizing in longer time horizon and highly nonlinear questions, the proposed paper concluded that SVM is more suitable than LSSVM in mid-term electricity MCP forecasting. Numerical examples using PJM interconnection data are utilized to illustrate the conclusion.
从目前的电价预测研究来看,支持向量机(SVM)和最小二乘支持向量机(LSSVM)哪一个更适合解决中期电力市场出清价格(MCP)预测等时间跨度非常大的高度非线性回归问题,很难得出结论。本文采用价格区间分析技术对基于单支持向量机和单LSSVM的中期电力MCP预测模型进行了详细的评价。基于更详细的性能评估结果,并考虑到机器学习技术在更长的时间范围和高度非线性问题上的要求,本文认为SVM比LSSVM更适合中期电力MCP预测。利用PJM互连数据的数值算例对结论进行了验证。
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引用次数: 3
Coordinated optimization of district electricity and heating system based on genetic algorithm 基于遗传算法的区域电力供热系统协调优化
Pub Date : 2016-10-01 DOI: 10.1109/APPEEC.2016.7779749
Hailin Ge, Fei Liu, Haoyong Chen, Cong Zhang
Interconnection and coupling between electric power, heating and natural gas systems are becoming closer and closer. From the point of view of coordinated optimization, through the establishment of mathematical model of district electricity and heating system, a coordinated optimization model of district electricity and heating system based on genetic algorithm is constructed in this paper. A typical district electricity and heating system in engineering is modelled and analyzed using the above mentioned model, the average convergence characteristics and optimization effect are studied. Through the experimental results, the practicability and validity of the coordinated optimization model of district electricity and heating system based on genetic algorithm are verified. The research contents of this paper lays the foundation for the operation optimization of district electricity and heating system.
电力、供热和天然气系统之间的互联和耦合越来越紧密。本文从协调优化的角度出发,通过建立区域电力供热系统数学模型,构建了基于遗传算法的区域电力供热系统协调优化模型。利用该模型对工程中典型的区域供热系统进行了建模和分析,研究了该模型的平均收敛特性和优化效果。通过实验结果,验证了基于遗传算法的区域电供热协调优化模型的实用性和有效性。本文的研究内容为区域电力供热系统的优化运行奠定了基础。
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引用次数: 4
Power quality assessment of current electrical vehicle charging processes 当前电动汽车充电过程电能质量评价
Pub Date : 2016-10-01 DOI: 10.1109/APPEEC.2016.7779745
J. C. Hernández, A. Medina, F. Jurado
The penetration of electrical vehicles (EVs) has an impact not only in the presumably increasing electrical demand, but also on power quality (PQ) of low-voltage (LV) radial distribution systems (RDSs), specifically in the harmonic current emission. Thus, it is essential that EV battery charging system designers should be aware of the potential impact of their designs on harmonic emission. Since the effect of charging systems on RDSs is not merely the numerical sum of total harmonic distortion (THD), harmonic phase cancellation may take place, harmonic phase angles should be also investigated. A theoretical background description on harmonics allowed us to perform a suitable campaign of harmonics measurements. Ten sets of measurements were performed on complete charging cycles of two different types of EVs. The results included the statistical characterization of individual harmonic current distortion and phase angle in order to account for randomness during the charging process.
电动汽车的普及不仅会增加电力需求,还会影响低压径向配电系统的电能质量,特别是谐波电流的发射。因此,电动汽车电池充电系统设计人员必须意识到其设计对谐波发射的潜在影响。由于充电系统对rds的影响不仅仅是总谐波失真(THD)的数值总和,谐波相位抵消可能发生,因此还应研究谐波相位角。对谐波的理论背景描述使我们能够进行合适的谐波测量活动。对两种不同类型电动汽车的完整充电周期进行了10组测量。结果包括单个谐波电流畸变和相位角的统计表征,以解释充电过程中的随机性。
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引用次数: 9
Load shedding strategy coordinate optimization based on sensitivity analysis 基于灵敏度分析的减载策略协调优化
Pub Date : 2016-10-01 DOI: 10.1109/APPEEC.2016.7779818
Dandan Zhang, Wenbo Li, Zhe Jiang, Naihu Wu, Yanwen Hou
The paper proposes a coordinate optimization strategy of load shedding based on sensitivity analysis, which starts from optimizing the control method for load shedding when multi-line overload at the same time. Used of node voltage equation and incidence matrix, the integrated sensitivity relationship between the change of node's load and all current of the overload lines is derived. The node comprehensive sensitivity is put forward which considers the difference of lines' overload coefficient and is used to select alternative nodes. Weighted sum of economic cost and balance index was taken as objective function to establish the load shedding optimization model and the model is solved by the adaptive particle swarm optimization algorithm of nonlinear weight. The simulation results of a practical system show that the optimal load shedding strategy can be quickly obtained.
本文从优化多线同时过载时的减载控制方法入手,提出了一种基于灵敏度分析的减载协调优化策略。利用节点电压方程和关联矩阵,推导了节点负载变化与过载线路各电流之间的综合灵敏度关系。提出了考虑线路过载系数差异的节点综合灵敏度,用于选择备选节点。以经济成本与平衡指标的加权和为目标函数,建立了减载优化模型,并采用非线性权值自适应粒子群优化算法对模型进行求解。实际系统的仿真结果表明,该方法可以快速得到最优减载策略。
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引用次数: 2
Capacity planning of battery energy storage system within wind farm 风电场电池储能系统容量规划
Pub Date : 2016-10-01 DOI: 10.1109/APPEEC.2016.7779805
Qian Dai, Xiaohui Qin, Jingqi Yang, Pingliang Zeng, Qinyong Zhou, Feng Zhao
The capacity planning of a battery energy storage system (BESS) in a wind farm is proposed, which considered a coordinated operational dispatch strategy for a wind farm with BESS. The planning objective is based on the minimum deviation value of wind farm power output as referenced. The most significant advantage in the proposed model is that the lifetime of BESS and forecasting error of wind power are considered. The planning model finally can be resolved by the particle swarm optimization. The case studies are used to validate the performance of the proposed model.
提出了风电场电池储能系统的容量规划,该规划考虑了风电场与电池储能系统的协调调度策略。规划目标以风电场输出的最小偏差值为参考。该模型最大的优点是考虑了BESS的寿命和风电的预测误差。最后利用粒子群算法对规划模型进行求解。案例研究用于验证所提出模型的性能。
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引用次数: 4
On-line incipient faults detection in underground cables based on single-end sheath currents 基于单端护套电流的地下电缆早期故障在线检测
Pub Date : 2016-10-01 DOI: 10.1109/APPEEC.2016.7779604
Chao Zhang, X. Kang, Xiuda Ma, Shuai Jiang, Xiao-Xue Qu
Incipient faults in underground cables would repeatedly occur until they evolve into permanent faults. Detection of incipient faults can determine the status of cable insulation and provide an early warning before the breakdown of underground cables. The characteristics of traveling waves of incipient faults are analyzed in the modal domain, and the theoretical analysis shows that the sum of sheath currents can be used to detect incipient faults. Both the over-current and the wavelet transform modulus maximum of the sum of single-end sheath currents are examined to detect an incipient fault. After an incipient fault is detected, the faulty phase is selected according to the root-mean-squares of three phases. A cable system model is built in PSCAD/EMTDC, and simulation results show that the detection algorithm can accurately detect incipient faults under different fault conditions.
地下电缆的早期断层会反复发生,直至演变为永久断层。早期故障的检测可以判断电缆绝缘的状态,为地下电缆的击穿提供预警。在模态域分析了初发故障的行波特征,理论分析表明,可以利用鞘层电流之和来检测初发故障。通过检测过电流和单端护套电流总和的小波变换模极大值来检测早期故障。检测到早期故障后,根据三相均方根选择故障相位。在PSCAD/EMTDC中建立了电缆系统模型,仿真结果表明,该检测算法能够在不同的故障条件下准确检测出早期故障。
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引用次数: 10
Performance of ROCOF protection in PV system 光伏系统roof保护性能研究
Pub Date : 2016-10-01 DOI: 10.1109/APPEEC.2016.7779545
Bohan Liu, Xiangping Ni, Guo-zeng Yan, Bo Li, K. Jia
Due to deregulation and the use of renewable power, especially solar power, the proportion of PV system is rapidly increasing and most of them are connected to distribution networks to supply power to the grid as well as local loads. There are many power quality issues to be considered with PV systems and one of the main issues is islanding. It is important to estimate and detect an islanding situation quickly and accurately as it can lead to serious plant damage if the grid is suddenly reconnected. This paper investigates the characteristics of ROCOF relays which affect the operation responses and analyze the ROCOF performance for PV systems islanding detection. The equivalent impedance value V2/P is introduced as an interlock function to cooperate with ROCOF relays to avoid false operation during the non-islanding situation. It is shown that it can block nuisance tripping signals quickly and accurately. The range of effectiveness is established for the small power imbalances where there is a small potentially non-detection zone due to the overlap range of the impedance value.
由于放松管制和使用可再生能源,特别是太阳能,光伏系统的比例正在迅速增加,大多数光伏系统连接到配电网,向电网和当地负荷供电。光伏系统有许多电能质量问题需要考虑,其中一个主要问题是孤岛。快速准确地估计和检测孤岛情况非常重要,因为如果电网突然重新连接,可能会导致严重的工厂损坏。本文研究了影响光伏系统运行响应的roof继电器的特性,分析了用于光伏系统孤岛检测的roof性能。引入等效阻抗值V2/P作为联锁功能,配合ROCOF继电器,避免非孤岛情况下误动。结果表明,该方法能快速、准确地阻断有害跳闸信号。有效范围是针对小功率不平衡而建立的,其中由于阻抗值的重叠范围而存在小的潜在未检测区域。
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引用次数: 2
期刊
2016 IEEE PES Asia-Pacific Power and Energy Engineering Conference (APPEEC)
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