排序方式： 共有135条查询结果，搜索用时 15 毫秒
31.
Zhe Yang Member IEEE Hongyi Wang Student Member IEEE Wenlong Liao Member IEEE Claus Leth Bak Senior Member IEEE Zhe Chen Fellow IEEE 《电力系统保护与控制》2025,10(1):18-39
Numerous renewable energy sources (RESs) are coupled with the power grid through power electronics to advance low-carbon objectives. These RESs predominantly connect to the AC collection network via inverters, with the electricity they produce either transmitted over long distances through high-voltage lines or utilized locally within the distribution system. The unique interfacing of RESs alters their fault response characteristics, typically resulting in limited fault currents, frequency deviations, and fluctuating sequence impedance angles. Therefore, existing protection principles based on fault signatures of synchronous generators will face significant challenges including distance relays, directional elements, differential relays, phase selectors, and overcurrent relays. To solve these issues, innovative protection technologies have been developed to bolster grid stability and security. Furthermore, the superior controllability of power converters presents an opportunity to devise effective control strategies that can adapt existing protection mechanisms to function correctly in this new energy landscape. Nevertheless, the complexity of fault behaviors exhibited by RESs necessitates further refinement of these schemes. Therefore, this paper aims to consolidate current research methodologies and explore prospective avenues for future investigation. 相似文献
32.
Yibo Wang Member IEEE Yu Liu Chuang Liu Member IEEE Guowei Cai Xinyi Zhang Kaipu Liu Yuan Wang Chen Liu Zhanhui Du 《电力系统保护与控制》2025,10(3):114-124
In the context of increasing demand for flexibility and controllability in distribution networks, this paper proposes a dual-bus parallel supply (DBPS) system based on bipolar direct AC/AC conversion. First, the topology of the DBPS system, which is composed of both conventional and flexible bus ports, is described. Then, through analyzing the principles of the DBPS system, the voltage flexible regulation range is obtained, and its superiority over a topological reciprocity system is achieved. Then, a control strategy for the DBPS system is proposed based on the theory of power flow regulation of distribution ring networks and the principles of flexible bus regulation of the DBPS system. Finally, simulation analyses on flexible control scenarios in different networking modes of the DBPS system verify the correctness and validity of the proposed theory. 相似文献
33.
As carbon emissions reduction is becoming increasingly important for sustainable development and carbon neutrality targets, the concept of carbon emission market has been recently proposed in order to essentially manage carbon emission on the demand side by allowing electricity consumers to purchase or sell carbon emission quotas. Hence, real-time demand-side carbon emission monitoring (DCEM), indicating the amount of carbon emission that each electricity consumer should be responsible for, becomes a necessity for the operation of the carbon emission market. However, the real-time DCEM cannot be achieved by carbon emission flow (CEF) analysis due to the unavailability of real-time power demand data. In this connection, this paper proposes a two-stage real-time DCEM method based on the graph neural network (GNN). In the first stage, power system operating scenario data, including the power generation capacity and power demand data, are collected to calculate carbon emission patterns through CEF analysis. In the second stage, a data-driven GNN-based model is designed to learn from historical daily carbon emission patterns and then realize accurate real-time DCEM with real-time available generation-side measurements only. Case studies on the 118-bus power system operated with day-ahead planning considering carbon emission are performed to demonstrate the accuracy and effectiveness of the proposed method. 相似文献
34.
Yinyu Yan Yichao Sun Member IEEE Zhiyuan Fan Carlos Alberto Teixeir Member IEEE Minqiang Hu Member IEEE 《电力系统保护与控制》2025,10(2):54-68
Energy storage systems support electrical grid stability by enabling strategies to tackle issues, such as power fluctuations, low inertia, and insufficient damping. The present study proposes a battery energy storage system based on a modular multilevel converter with multiplexed submodule arms (M-MMC-BESS) to reduce the number of switching devices while embedding DC short-circuit fault ride-through capability. Compared to the conventional two-stage half-bridge topology, the M-MMC-BESS retains the same number of switching devices but allows uninterrupted operation under DC short-circuit faults. In addition, compared to the two-stage full-bridge topology, the proposed topology reduces the number of switching devices by one-third. The control of the M-MMC-BESS is thoroughly investigated under both normal and DC short-circuit operating conditions. Simulation and experimental results are used to demonstrate the effectiveness of the proposed system and control approach. 相似文献
35.
Fuzhang Wu Jun Yang Member IEEE Song Ke Hao Jiang Muchao Xiang Zaixun Ling Guiping Deng 《电力系统保护与控制》2025,10(4):16-27
Large-scale development of electric vehicles (EVs) exposes power grids and transportation networks with limited capacity to increased fault risks. In this paper, a method to prevent fault risks in advance by using the flexibility of EV travel to coordinate the operation of distribution and transportation networks is proposed. Since EV travel decisions are influenced by the charging and travel time costs, adjusting charging price and travel time price can help guide behavior and enable coordinated operation of power and transportation networks. First, risk-based distribution locational marginal prices (RDLMPs) are established to restrain the distribution network risks. Second, traffic risks are formulated using origin-destination (OD) risk marginal prices (ODRMPs) considering the degree of traffic congestion fault risks. Under the guidance of the RDLMPs and ODRMPs, EV fleets optimize their travel plans to minimize overall costs, including charging and time costs. Finally, case studies verify that the proposed method can reduce the operational risks of both distribution and transportation networks. 相似文献
36.
Yongjun Zhang Senior Member IEEE Kaidong Lin Wenyang Deng Member IEEE Di Zhang Dongliang Xiao 《电力系统保护与控制》2024,9(3):60-69
The occurrence of power flow reversal and off-limit of the voltage on common bus becomes more frequent because of the increasing penetration of renewable energy sources (RES) in microgrids. To guarantee the safe and stable operation, adjusting the power output of RES-based inverters to avoid the off-limit voltage is necessary. Considering the apparent power characteristics of inverters, as well as the minimum participation of active power, a voltage control strategy based on stage division to be within the voltage limit is investigated in this paper. In the case of unknown demand and distribution of loads, the proposed control strategy is able to make full use of the apparent power to regulate voltage using simple calculations, while the performance in economical operation is satisfactory. Simulation results prove the effectiveness of the proposed method on the common bus off-limit voltage adjustment. 相似文献
37.
在 “SLH 连载之一、二”从理论角度阐明开关线性复合(SLH)电源因高阻输出特性而获强鲁棒性的基础上,结合其典型拓扑的实践及效果,揭示了SLH开环系统对负载参数变化和多类负载呈现自适应能力的内在原因,廓清了相关学术概念,为 “连载之一、二”提供了实验依据。 相似文献
38.
Personal photo revisitation on smart phones is a common yet uneasy task for users due to the large volume of photos taken in daily life. Inspired by the human memory and its natural recall characterist... 相似文献
39.
Pratibha Singh Graduate Student Member IEEE Uttam Kumar Niraj Kumar Choudhary Senior Member IEEE Nitin Singh Senior Member IEEE 《电力系统保护与控制》2024,9(6):156-183
The advancement accomplished in power systems over the last decade has enabled the extensive integration of renewable energy sources. It has resulted in enhanced efficiency and reliability of the system by meeting the load demand from small, local sources known as distributed generators (DGs). Consequently, this has led to the concept of microgrids (MGs). Nevertheless, there are operational challenges such as bidirectional power flow, fluctuations in fault current level, and protection issues such as blinding, false tripping, and unintentional islanding. Synchronous generator-based distributed generators (SGDGs) may experience a loss of synchronism across the generators due to undesirable events, such as abrupt changes in demand or faults. Similarly, voltage instability concerns may arise with inverter-based distributed generators (IDGs). This paper provides a thorough review of the concepts of critical clearing time (CCT) and grid code compliance in relation to SGDGs and IDGs, respectively. It provides a comprehensive analysis of the existing literature on several protection strategies used for reducing the adverse effects of DG integration. It highlights the characteristics, benefits, and constraints of these schemes. Finally, this paper presents the conclusion and outlines the potential areas for future study in the field of protective relaying methods, specifically addressing the issues posed by current power systems. 相似文献
40.
Siying Zhao Changzheng Shao Member IEEE Jinfeng Ding Bo Hu Senior Member IEEE Kaigui Xie Senior Member IEEE Xueying Yu Zihan Zhu 《电力系统保护与控制》2024,9(5):96-111
For conventional power systems, the forced outage of components is the major cause of load shedding. Unreliability tracing is utilized to allocate the total system load-shedding risk among individual components in accordance with their different contributions. Therefore, critical components are identified and pertinent measures can be taken to improve system reliability. The integration of wind power introduces additional risk factors into power systems, causing previous unreliability tracing methods to become inapplicable. In this paper, a novel unreliability tracing method is proposed that considers both aleatory and epistemic uncertainties in wind power output and their impacts on power system load-shedding risk. First, modelling methods for wind power output considering aleatory and epistemic uncertainties and component outages are proposed. Then, a variance-based index is proposed to measure the contributions of individual risk factors to the system load-shedding risk. Finally, a novel unreliability tracing framework is developed to identify the critical factors that affect power system reliability. Case studies verify the ability of the proposed method to accurately allocate load-shedding risk to individual risk factors, thus providing decision support for reliability enhancement. 相似文献