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Second order exponential asymptotic expansion for probabilistic load flow analysis 概率潮流分析的二阶指数渐近展开
IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2026-02-01 DOI: 10.1016/j.ijepes.2026.111582
Hooman Basirat , Mohammad Mohammadi , Dariush Keihan Asl
Due to the inherent randomness in certain resources and load demands, load flow analysis must be performed using efficient and robust probabilistic methods to accurately capture power system uncertainties. This paper proposes a novel non-iterative and non-parametric framework, called the second-order exponential asymptotic expansion (SOEAE) method, to solve the probabilistic load flow problem. Unlike classical methods such as first-order second moment, saddlepoint approximation method, or point estimation methods, the proposed technique maintains a consistent computational cost regardless of the number of random variables. Hence, only a single iteration is sufficient to obtain the Taylor series expansion of the output variables as functions of the input random variables. Also, this method can approximate the density functions of unknown variables, regardless of the input variables’ distribution type. In addition to lower computational cost and higher accuracy, the proposed method preserves key advantages of traditional methods and derives cumulative distribution functions without integration. The suggested method is examined on IEEE 14-bus and IEEE 118-bus test systems, and results with reasonable accuracy are achieved. The results are compared with those obtained using Monte Carlo simulation and saddlepoint approximation methods.
由于某些资源和负荷需求具有固有的随机性,负荷潮流分析必须采用高效、鲁棒的概率方法来准确捕捉电力系统的不确定性。本文提出了一种新的非迭代非参数框架,即二阶指数渐近展开(SOEAE)方法,用于求解概率负荷流问题。与经典方法如一阶二阶矩、鞍点近似方法或点估计方法不同,无论随机变量的数量如何,所提出的技术都保持一致的计算成本。因此,只需一次迭代就足以得到输出变量作为输入随机变量函数的泰勒级数展开式。此外,无论输入变量的分布类型如何,该方法都可以近似未知变量的密度函数。该方法不仅计算成本低、精度高,而且保留了传统方法的主要优点,无需积分即可推导出累积分布函数。在ieee14总线和ieee118总线测试系统上对该方法进行了验证,得到了精度合理的结果。并与蒙特卡罗模拟和鞍点近似法的结果进行了比较。
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引用次数: 0
Distribution expansion planning considering direct effect of flexibility and load priorities 考虑柔性和负荷优先级直接影响的配电网扩容规划
IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2026-02-01 DOI: 10.1016/j.ijepes.2026.111656
Alireza Azad, Seyed Pouria Miri, Hossein Gharibvand, G.B. Gharehpetian
Conventional distribution expansion planning (DEP) involves determining the location, installation time, and sizing of feeders, transformers, and substations in order to have a balance between generation and consumption in planning horizon. In future distribution networks, the penetration of renewable resources will increase. Since these resources are intermittent in nature, it is important to consider methods required to create a balance between generation and consumption in the DEP. In this paper, flexibility, as a key concept in responding to consumption and generation imbalances, is analyzed in the context of DEP. To enable the simultaneous minimization of DEP costs and enhancement of energy flexibility, it is considered as a term in the objective function of DEP. To determine the optimal location and capacity of flexibility resources, load priorities and node self-sufficiency are incorporated into the problem, and a techno-economic analysis is carried out. DEP is studied and evaluated in an 18-bus distribution system using different scenarios for cases with and without considering the flexibility. Two common flexibility resources, energy storage systems (ESS) and distributed generation (DG), are considered as candidates, and sensitivity analysis is conducted. Results of the study showed that DGs are more effective than ESSs for enhancing flexibility. The higher cost of ESS compared to DG was the limiting factor for utilizing ESS, leading to a lower flexibility-to-cost ratio compared to DG.
传统的配电扩展规划(DEP)包括确定馈线、变压器和变电站的位置、安装时间和规模,以便在规划范围内实现发电量和用电量的平衡。在未来的配电网中,可再生资源的渗透率将会增加。由于这些资源本质上是间歇性的,因此考虑在DEP中实现发电和用电平衡所需的方法是很重要的。本文在DEP的背景下分析了灵活性,灵活性是应对消费和发电不平衡的一个关键概念。将其作为DEP目标函数中的一项,将负荷优先级和节点自给率纳入问题中,确定柔性资源的最优位置和容量,并进行技术经济分析。在考虑和不考虑灵活性的情况下,对一个18总线配电系统的DEP进行了研究和评估。将储能系统(ESS)和分布式发电(DG)两种常见的柔性资源作为备选资源,进行敏感性分析。研究结果表明,DGs在增强柔韧性方面比ess更有效。与DG相比,ESS的高成本是利用ESS的限制因素,导致与DG相比,ESS的灵活性成本比更低。
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引用次数: 0
A data-driven high impedance fault detection framework for distribution network based on improved temporal convolutional network 基于改进时间卷积网络的数据驱动配电网高阻抗故障检测框架
IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2026-02-01 DOI: 10.1016/j.ijepes.2026.111658
Changyu Liu, Xiaojun Wang, Zhao Liu, Dahai Zhang, Guomin Luo, Jinghan He
High-impedance faults (HIFs) pose a great challenge for the protection of new-type distribution networks because of their weak characteristics and strong similarity to disturbance conditions such as capacitor switching and load switching. Therefore, an accurate and reliable HIF detection method is crucial for the safe power supply of distribution networks. A data-driven HIF fault detection framework for distribution networks is proposed, built upon an improved temporal convolutional network with confidence enhancement and interpretability. Firstly, the efficient channel attention temporal convolutional network (ECA-TCN) based HIF detection model is designed to exploit the temporal features in the transient zero-sequence current. Secondly, this paper proposes a HIF detection framework based on time-series sliding window and confidence level check, which can effectively achieve the balance between accuracy and rapidity and enhance the credibility of the HIF detection model in practical applications. Then, the score class activation map (Score-CAM) analysis method provides an explanation for the model’s decision-making process and enhances the model interpretability. Finally, the proposed framework is validated on both the MATLAB/Simulink platform and field tests, demonstrating superior performance compared with existing methods.
由于高阻抗故障具有较弱的特性,且与电容切换、负载切换等扰动条件具有很强的相似性,因此对新型配电网的保护提出了很大的挑战。因此,准确可靠的HIF检测方法对配电网的安全供电至关重要。提出了一种数据驱动的配电网络HIF故障检测框架,该框架基于改进的时间卷积网络,具有置信度增强和可解释性。首先,利用瞬态零序电流的时间特征,设计了基于高效通道关注时间卷积网络(ECA-TCN)的HIF检测模型;其次,本文提出了一种基于时间序列滑动窗口和置信水平检查的HIF检测框架,可以有效地实现精度与快速性的平衡,增强HIF检测模型在实际应用中的可信度。然后,分数类激活图(score - cam)分析方法为模型的决策过程提供了解释,增强了模型的可解释性。最后,在MATLAB/Simulink平台和现场测试中对该框架进行了验证,与现有方法相比,该框架具有更好的性能。
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引用次数: 0
Multi-frequency coupled mechanism and propagation characteristics of subsynchronous oscillations induced by IBRs in power systems 电力系统中ibr诱发次同步振荡的多频耦合机理及传播特性
IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2026-02-01 DOI: 10.1016/j.ijepes.2026.111631
Yanhui Xu, Yundan Cheng, Le Zheng
Subsynchronous oscillations induced by inverter-based resources pose a significant threat to power system stability due to their wide propagation. This paper reveals a new propagation phenomenon of subsynchronous oscillations induced by inverter-based resources, characterized by multi-frequency coupling and a non-monotonic relationship between amplitude and oscillation frequency, revealing critical risks at non-resonant frequencies. To investigate this issue, the coupling mechanism and propagation characteristics of the multi-frequency coupled oscillations are analyzed. The study reveals that the multi-frequency coupling originates from the interaction between oscillation components and the synchronization control of inverter-based resources. This interaction introduces frequency coupling and generates the multiple frequency components in the instantaneous power. Furthermore, the non-monotonic characteristics is attributed to the frequency-dependent coupling impedances resulting from asymmetric interharmonic components generated by the frequency coupling. Building on this mechanism, a propagation coefficient based on instantaneous power amplitude is proposed to quantify propagation risk. Simulation results validate the proposed method, demonstrating its improved accuracy compared to existing analyses.
逆变器资源引起的次同步振荡由于其传播范围广,对电力系统的稳定性构成严重威胁。本文揭示了一种新的由逆变器资源引起的次同步振荡传播现象,该现象具有多频耦合和幅值与振荡频率之间的非单调关系,揭示了非谐振频率的临界风险。为了研究这一问题,分析了多频耦合振荡的耦合机理和传播特性。研究表明,多频耦合源于振荡分量之间的相互作用和基于逆变器的资源同步控制。这种相互作用引入了频率耦合,在瞬时功率中产生了多个频率分量。此外,非单调特性归因于频率耦合产生的非对称谐波分量所导致的频率相关耦合阻抗。在此基础上,提出了基于瞬时功率幅值的传播系数来量化传播风险。仿真结果验证了该方法的有效性,表明该方法的精度比现有分析方法有所提高。
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引用次数: 0
Voltage stability improvement of weak grids using a new cascade droop control of grid-connected converter 利用新型并网变流器串级下垂控制改善弱电网电压稳定性
IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2026-02-01 DOI: 10.1016/j.ijepes.2026.111594
Hayder Hassan Abbas, Qobad Shafiee, Hassan Bevrani
The voltage control loop of a virtual synchronous generator (VSG) is typically governed by a conventional reactive power-voltage droop control, which may exhibit instability when encountering disturbances or operating under weak grid conditions. This paper proposes a new control approach to reduce voltage fluctuations and improve voltage stability in converter-dominated weak grids. The proposed controller extends the conventional droop control by introducing layered control loops named cascade droop control (CDC), enabling enhanced voltage support and grid stability even in weak grid case studies. The proposed methodology aims to enhance the grid-connected converter stability while maintaining simplicity in implementation.
The proposed approach is assessed through analyses conducted in both the time and frequency domains. The stability analyses and simulation outcomes confirm the effectiveness of the new CDC technique in addressing weak grid conditions.
虚拟同步发电机(VSG)的电压控制环通常由传统的无功电压下垂控制控制,当遇到干扰或在弱电网条件下运行时可能会表现出不稳定性。本文提出了一种新的控制方法,以减少变流器控制弱电网的电压波动,提高电压稳定性。该控制器通过引入串级下垂控制(CDC)的分层控制回路扩展了传统的下垂控制,即使在弱电网情况下也能增强电压支持和电网稳定性。提出的方法旨在提高并网变流器的稳定性,同时保持实现的简单性。通过在时域和频域进行分析来评估所提出的方法。稳定性分析和仿真结果验证了该方法在解决弱电网条件下的有效性。
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引用次数: 0
Analysis and suppression of phase-locked loop induced negative-damping under weak grid conditions 弱电网条件下锁相环诱导负阻尼的分析与抑制
IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2026-02-01 DOI: 10.1016/j.ijepes.2026.111628
Ming Li , Yangjun Xiao , Hua Geng , Rui Zhang , Junjie Li , Xing Zhang
Under weak grid conditions, the increase in grid impedance and the reduction in short-circuit ratio (SCR) can induce coupled oscillations between the phase-locked loop (PLL) and the grid impedance. These interactions substantially degrade the grid-connected inverter damping characteristics and may even lead to negative-damping, resulting in phase jitter, oscillatory divergence, or loss of synchronization. Existing suppression methods, typically based on linear techniques such as bandwidth reduction or adaptive parameter compensation, face inherent limitations including strong dependence on accurate system models and implementation complexity, thereby failing to fundamentally restore system damping. To overcome these challenges, we propose an enhanced PLL structure incorporating a negative feedback branch, functionally equivalent to introducing an additional dissipation channel parallel to the phase rate-of-change term. This modification directly increases the damping ratio of the speed term, ensuring unidirectional dissipation of the system energy function and theoretically eliminating the negative-damping effect under weak grid conditions. The proposed method features intuitive parameter tuning, simple engineering realization, and low sensitivity to grid model uncertainties, thereby achieving superior stability and robustness. Simulation and experimental results validate the effectiveness and practicality of the proposed control strategy.
在弱电网条件下,电网阻抗的增大和短路比的减小会引起锁相环与电网阻抗之间的耦合振荡。这些相互作用大大降低了并网逆变器的阻尼特性,甚至可能导致负阻尼,导致相位抖动、振荡发散或同步损失。现有的抑制方法通常基于带宽缩减或自适应参数补偿等线性技术,存在固有的局限性,包括对精确系统模型的依赖性强和实现复杂性,因此无法从根本上恢复系统阻尼。为了克服这些挑战,我们提出了一种包含负反馈分支的增强型锁相环结构,其功能相当于引入一个平行于相位变化率项的额外耗散通道。这种修改直接增大了速度项的阻尼比,保证了系统能量函数的单向耗散,理论上消除了弱电网条件下的负阻尼效应。该方法参数整定直观,工程实现简单,对网格模型不确定性敏感性低,具有较好的稳定性和鲁棒性。仿真和实验结果验证了所提控制策略的有效性和实用性。
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引用次数: 0
Integration and optimisation analysis of PLC and SCADA-HMI–IPC systems in intelligent power distribution monitoring 智能配电监控中PLC与SCADA-HMI-IPC系统的集成与优化分析
IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2026-02-01 DOI: 10.1016/j.ijepes.2026.111597
Lingyun Gu , Fuping Wang
Tahe use of Programmable Logic Controllers (PLCs), Supervisory Control and Data Acquisition (SCADA) systems, and Human-Machine Interface industrial PCs (HMI IPCs) is still limited by the interface latency, inconsistent terminology, and limited operator support. To address these shortcomings in intelligent power distribution monitoring, this research paper presents and justifies a new Integrated Edge-Aware PLC-SCADA-HMI Optimization Model (IEPSHOM) to overcome them. It is novel because it combines a rule-first, decision-tree-refinement step with an adaptive Human-Machine Interface (HMI) to minimize detection latency and enhance the quality of operator responses. The 4-feeder low-voltage substation testbed consisted of Siemens S7-1200 PLCs and adaptive HMI dashboards to compare IEPSHOM with a traditional PLC-SCADA architecture. The outcomes indicate that the accuracy of fault detection in IEPSHOM improved by 11.6 percent, the false-positive rate decreased by 5.5 percent, the average latency decreased by 321 ms to 174 ms, and the operator alert resolution time decreased. There was a 2.4–3.1-point increase in the usability rating, indicating the usefulness of adaptive interfaces in improving decision precision under challenging situations. These results show that the effectiveness of real-time monitoring and operators in digital substations can be enhanced with the help of IEPSHOM.
可编程逻辑控制器(plc)、监控和数据采集(SCADA)系统和人机接口工业pc (HMI ipc)的使用仍然受到接口延迟、不一致的术语和有限的操作员支持的限制。为了解决智能配电监控中的这些不足,本文提出并论证了一种新的边缘感知PLC-SCADA-HMI集成优化模型(IEPSHOM)。它的新颖之处在于,它结合了规则优先、决策树细化步骤和自适应人机界面(HMI),以最大限度地减少检测延迟,提高操作员响应的质量。4线低压变电站测试平台由西门子S7-1200 plc和自适应HMI仪表板组成,将IEPSHOM与传统的PLC-SCADA架构进行比较。结果表明,IEPSHOM的故障检测准确率提高了11.6%,假阳性率降低了5.5%,平均延迟时间减少了321 ms ~ 174 ms,操作人员警报解决时间缩短了。可用性评分增加了2.4 - 3.1分,表明自适应界面在具有挑战性的情况下提高决策精度的有用性。这些结果表明,利用IEPSHOM可以提高数字化变电站实时监控和操作人员的有效性。
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引用次数: 0
Optimal operational planning of hybrid power plants in railway MVDC networks and comparison with standard AC connections 铁路MVDC网络混合电厂优化运行规划及与标准交流连接的比较
IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2026-02-01 DOI: 10.1016/j.ijepes.2026.111633
Laurent Cornaggia , Robin Girard , Olivier Despouys , Hélène Clémot , Panagiotis Andrianesis
The proliferation of Direct Current (DC) resources presents significant challenges for their connection to the grid, but also appealing opportunities for new connection options, such as Medium Voltage DC (MVDC) networks. Railway MVDC (R-MVDC) networks are among potential candidates for new DC resource connections. As such, DC resources, e.g., solar plus battery hybrid power plants (HPPs), that are geographically located near an R-MVDC network may either connect to the latter or to the closest Alternating Current (AC) network. This paper presents a mixed integer linear programming formulation for the optimal operational planning of an HPP connected to an R-MVDC network that encompasses the R-MVDC network constraints. Furthermore, it provides a comprehensive techno-economic analysis that compares the two connection options (AC and R-MVDC), employing the outcomes of the optimized HPP operation and a granular breakdown of the various cost components (converters, lines, losses). An application to the French R-MVDC network provides a first assessment for the potential of new HPP connections to the R-MVDC network, considering several HPP sizes and voltage levels.
直流(DC)资源的激增对其与电网的连接提出了重大挑战,但也为中压直流(MVDC)网络等新连接选项提供了诱人的机会。铁路MVDC (R-MVDC)网络是新的数据中心资源连接的潜在候选者之一。因此,地理上位于R-MVDC网络附近的直流资源,例如太阳能+电池混合发电厂(HPPs),可以连接到后者或最近的交流电(AC)网络。本文提出了一个混合整数线性规划公式,用于包含R-MVDC网络约束的连接到R-MVDC网络的HPP的最优运行规划。此外,它还提供了一个全面的技术经济分析,比较了两种连接方案(交流和R-MVDC),采用了优化的HPP运行结果和各种成本组成部分(转换器、线路、损耗)的细颗粒分解。一项针对法国R-MVDC网络的应用首次评估了新HPP连接到R-MVDC网络的潜力,考虑了几种HPP尺寸和电压水平。
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引用次数: 0
Centralized multi-microgrid control: peer-to-peer power trading for battery life extension and enhanced outage/fault resilience under generation uncertainty and demand variations 集中式多微电网控制:在发电不确定性和需求变化下,为延长电池寿命和增强停电/故障恢复能力而进行的点对点电力交易
IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2026-02-01 DOI: 10.1016/j.ijepes.2026.111650
Hossien Faraji, Amir Khorsandi, Seyed Hossein Hosseinian
This article presents several strategies for managing multi-level peer-to-peer power trading between the microgrids (MGs) within a multi-microgrid (MMG) system and the utility grid. These strategies apply to cases when the MGs are in on-grid mode, operating off-grid, and engaging in mutual power trading among interconnected MGs. The MMG under consideration includes two MGs, each equipped with either a wind turbine or a photovoltaic system, along with a battery unit to support variable three-phase loads. In each MG, there is a microgrid central controller (MGCC), which is responsible for communicating, exchanging information, and issuing necessary commands to the local controllers (LCs) under its command. A multi-microgrid central controller (MMGCC) is also responsible for monitoring and supervising the MGCCs. In on-grid mode, each MG uses control schemes to manage power exchange with the main grid. These strategies aim to minimize battery charging and discharging cycles when selling excess power to the grid, while also considering factors such as the uncertainty of distributed generation (DG) outputs and fluctuations in load demand. In off-grid mode, MGs are designed to operate independently under normal conditions, with specific control strategies implemented for islanding scenarios. Furthermore, MGs can provide mutual support during critical outages and fault situations and work in an interconnected mode. Nonlinear simulations conducted using MATLAB/Simulink demonstrate that the proposed control methods effectively achieve all objectives. These purposes include adequately supplying MG loads, accounting for uncertainty in power generation and demand variations, managing power exchanges between MGs and the utility grid while reducing the frequency of battery charging and discharging cycles in on-grid mode, ensuring optimal performance of each MG in off-grid conditions, and enabling robust performance of off-grid MGs through peer-to-peer communication between MGs in interconnected conditions.
本文提出了在多微电网系统和公用电网中管理微电网之间多级点对点电力交易的几种策略。这些策略适用于并网模式、离网运行和相互连接的mg之间进行相互电力交易的情况。正在考虑的MMG包括两个MMG,每个配备风力涡轮机或光伏系统,以及支持可变三相负载的电池单元。在每个微电网中,都有一个微电网中央控制器(MGCC),负责向其指挥下的本地控制器(lc)进行通信、交换信息并发出必要的命令。多微电网中央控制器(MMGCC)也负责监测和监督多微电网。并网模式下,各主电网通过控制方案管理与主电网的电力交换。这些策略的目的是在向电网出售多余电力时最大限度地减少电池充放电周期,同时还考虑分布式发电(DG)输出的不确定性和负载需求波动等因素。在离网模式下,mgg被设计为在正常条件下独立运行,并针对孤岛场景实施特定的控制策略。此外,mg可以在严重中断和故障情况下提供相互支持,并以互联模式工作。利用MATLAB/Simulink进行的非线性仿真表明,所提出的控制方法有效地实现了所有目标。这些目的包括充分提供MG负载,考虑发电和需求变化的不确定性,管理MG和公用电网之间的电力交换,同时减少并网模式下电池充电和放电周期的频率,确保每个MG在离网条件下的最佳性能,并通过MG之间的点对点通信实现离网MG的强大性能。
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引用次数: 0
An improved grid-forming control method with adaptive virtual impedance combining current limitation and transient stability improvement 一种结合限流和提高暂态稳定性的改进自适应虚拟阻抗成网控制方法
IF 5 2区 工程技术 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC Pub Date : 2026-02-01 DOI: 10.1016/j.ijepes.2026.111659
Xiaoping Zhou, Lei Zhang, Hanting Peng, Lerong Hong, Qianming Xu, Zhen Zhang, Jiakun Shao, Jianchao Ma, Yizhen Hu
The virtual impedance (VI) control method is widely used to limit fault current for grid-forming converter (GFMC). However, in this article, it is found that the VI deteriorates the transient synchronization stability of the GFMC under grid faults. To solve this problem, an improved grid-forming control method combining current limitation and transient stability improvement is proposed. By compensating the transient electromagnetic power, the power feedback of the active power control (APC) loop is changed from the real active power at the point of common coupling to the virtual active power on the converter-side during the fault period. Then, the detrimental impact of virtual resistance on transient stability can be reversed into a beneficial effect, thereby solving the contradiction between current limitation and transient stability. Besides, the transient damping power is feedbacked to adjust the active power reference, ensuring the transient stability under faulty weak grid scenario. Both of them are used as two extra degrees of freedom to eliminate the active power imbalance and jointly enhance the transient stability. Furthermore, an adaptive VI control is adopted to automatically tune the VI so that the fault current can be kept at maximum allowable value to support faulty grid. More importantly, the proposed method is not affected by the fault degree and grid strength. Simulations and experimental results validate the effectiveness of the proposed method.
虚拟阻抗(VI)控制方法被广泛应用于成网变流器的故障电流限制。然而,本文发现,在电网故障情况下,VI降低了GFMC的暂态同步稳定性。为了解决这一问题,提出了一种结合限流和改进暂态稳定的改进成网控制方法。通过对暂态电磁功率进行补偿,使有功功率控制回路的功率反馈从共耦点的实际有功功率转变为故障期间变流器侧的虚有功功率。从而将虚电阻对暂态稳定的不利影响转化为有利影响,从而解决限流与暂态稳定之间的矛盾。同时,对暂态阻尼功率进行反馈,调节有功基准,保证了系统在故障弱网情况下的暂态稳定。两者作为两个额外的自由度来消除有功功率不平衡,共同提高暂态稳定性。此外,采用自适应补偿补偿控制自动调整补偿补偿,使故障电流保持在最大允许值,以支持故障电网。更重要的是,该方法不受故障程度和网格强度的影响。仿真和实验结果验证了该方法的有效性。
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引用次数: 0
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International Journal of Electrical Power & Energy Systems
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