检索结果-南通市图书馆

Delay-dependent Wide-area Damping Controller Synthesis Approach Using Jensen’s Inequality and Evolution Algorithm

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2023年第5期9卷 1774-1785页

作者： Wencheng Wu Xiaoru Wang Hong Rao baorong zhou the School of Electrical Engineering Southwest Jiaotong UniversityChengduSichuan Province 610021China the Southwest Electric Power Design Institute Sichuan Province 610056China the State Key Laboratory of HVDC Electric Power Research InstituteCSGGuangzhou 510663China

A time-delay-dependent wide-area damping controller synthesis approach,based on Jensen’s integral inequality and evolution algorithm,is developed to suppress the adverse effect of time delay on the supplemental control of high-voltage direct current(DC)transmission ***,the state-space model of hybrid AC/DC systems with time delay is derived and the delay-dependent criteria for the stability of the closed-loop system are provided based on Jensen’s integral ***,initial solutions are randomly generated to overcome the difficulty of solving the nonlinear matrix ***,the time-delay stability upper bound of the controller is optimized using the differential evolution *** comparison to popular time-delay stable controller design methods,such as the free-weighting-matrix approach,the proposed method based on output feedback realization requires fewer decision variables and is more suitable for large-scale hybrid AC/DC *** examples are introduced to verify the effectiveness of the proposed method.

关键词： Damping suppression delay-dependent control differential evolution algorithm Jensen’s inequality output feedback time-varying delay wide-area control

Unified probabilistic gas and power flow

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2017年第3期5卷 400-411页

作者： Yuan HU Haoran LIAN Zhaohong BIE baorong zhou State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong UniversityXi’an 710049China Electric Power Research Institute China Southern Power GridGuangzhou 510080China

The natural gas system and electricity system are coupled tightly by gas turbines in an integrated energy system. The uncertainties of one system will not only threaten its own safe operation but also be likely to have a significant impact on the other. Therefore, it is necessary to study the variation of state variables when random fluctuations emerge in the coupled system. In this paper, a multislack-bus model is proposed to calculate the power and gas flow in the coupled system. A unified probabilistic power and gas flow calculation, in which the cumulant method and Gram–Charlier expansion are applied, is first presented to obtain the distribution of state variables after considering the effects of uncertain factors. When the variation range of random factors is too large, a new method of piecewise linearization is put forward to achieve a better fitting precision of probability distribution. Compared to the Monte Carlo method, the proposed method can reduce computation time greatly while reaching a satisfactory *** validity of the proposed methods is verified in a coupled system that consists of a 15-node natural gas system and the IEEE case24 power system.

关键词： Natural gas and electricity coupled system Uncertainties Multi-slack-bus model Cumulant method Probabilistic power and gas flow Piecewise linearization

Day-ahead Network-constrained Unit Commitment Considering Distributional Robustness and Intraday Discreteness:A Sparse Solution Approach

在线全文

学校读者我要写书评

暂无评论

Journal of Modern Power Systems and Clean Energy 2023年第2期11卷 489-501页

作者： Xiaodong Zheng baorong zhou Xiuli Wang Bo Zeng Jizhong Zhu Haoyong Chen Waisheng Zheng School of Electrical Engineering Xi’an Jiaotong UniversityXi’an 710049China Electric Power Research Institute of China Southern Power Grid Co. Ltd.Guangzhou 510663China Shaanxi Key Laboratory of Smart Grid School of Electrical EngineeringXi’an Jiaotong UniversityXi’an 710049China Department of Industrial Engineering and the Department of Electrical and Computer EngineeringUniversity of PittsburghPittsburghPA 15260USA School of Electric Power Engineering South China University of TechnologyGuangzhou 510641China China Southern Power Grid Co. Ltd.Guangzhou 510663China

Quick-start generation units are critical devices and flexible resources to ensure a high penetration level of renewable energy in power *** considering the wind uncertainty and both binary and continuous decisions of quickstart generation units within the intraday dispatch,we develop a Wasserstein-metric-based distributionally robust optimization model for the day-ahead network-constrained unit commitment(NCUC)problem with mixed-integer *** propose two feasible frameworks for solving the optimization *** approximates the continuous support of random wind power with a finite number of events,and the other leverages the extremal distributions *** solution frameworks rely on the classic nested column-and-constraint generation(C&CG)*** is shown that due to the sparsity of L_(1)-norm Wasserstein metric,the continuous support of wind power generation could be represented by a discrete one with a small number of events,and the rendered extremal distributions are sparse as *** this reduction,the distributionally robust NCUC model with complicated mixed-integer recourse problems can be efficiently handled by both solution *** studies are carried out,demonstrating that the model considering quick-start generation units ensures unit commitment(UC)schedules to be more robust and cost-effective,and the distributionally robust optimization method captures the wind uncertainty well in terms of out-of-sample tests.

关键词： Unit commitment distributional robustness mixed-integer recourse nested column-and-constraint generation(C&CG) sparsity Wasserstein metric

Frequency Control at the Power Sending Side for HVDC Asynchronous Interconnections Between Yunnan Power Grid and the Rest of CSG

在线全文

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2021年第1期7卷 105-113页

作者： Hong Rao Wei Wu Tian Mao baorong zhou Chao Hong Yongjun Liu Xiaoshan Wu the Electric Power Research Institute of China Southern Power Grid(SEPRI CSG)Guangzhou 510080China

For a large-scale high voltage direct current (HVDC)asynchronous interconnected power grid, the frequency issue atthe power sending side under DC faults is a crucial *** solve this problem, based on rotor motion equations, theeffect of unbalanced power on the system frequency under DCfaults is analyzed. The characteristics and dynamic developmentprocess of frequencies after the injection of disturbances areanalyzed. In addition, the actions and coordinated strategies ofvarious frequency control measures are also investigated. Basedon the testing projects of an asynchronous interconnection in theChina Southern Power Grid (CSG), the frequency features arestudied according to the measured PMU data. The outcome showsthat the frequency problem of the Yunnan Power Grid after anasynchronous interconnection can be solved and controlled. Italso shows that the frequency limit control (FLC) is importantfor the frequency regulation of large scale HVDC asynchronousinterconnected DC power grids. As demonstrated, DC FLC caneffectively suppress the deviation of the transient ***, reasonable frequency regulation parameters shouldbe set and other area frequency control measures should becoordinated to maintain the frequency stability of the system.

关键词： Asynchronous interconnected power grid DC overload capacity DC frequency limit control frequency stability PMU data

数字开源社区异质许可协议下贡献者策略演化及扩散研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

系统工程理论与实践 2024年第8期44卷 2605-2624页

作者：邢青松周宝嵘邓富民重庆交通大学经济与管理学院重庆400074 四川大学商学院成都610065

开源创新过程中各参与主体违规使用源代码产生的违约侵权行为不利于开源社区建设发展.对此本研究基于贡献者视角,构建双方演化博弈模型,考虑成本收益因素在不同阶段对初始贡献者和后续贡献者双方演化行为的影响,探讨不同类型许可协议行... 详细信息

开源创新过程中各参与主体违规使用源代码产生的违约侵权行为不利于开源社区建设发展.对此本研究基于贡献者视角,构建双方演化博弈模型,考虑成本收益因素在不同阶段对初始贡献者和后续贡献者双方演化行为的影响,探讨不同类型许可协议行为限制强度和违约侵权行为间的相互制约关系,借助Lotka-Volterra模型测度不同类型许可协议发展扩散趋势,以期规避违约侵权现象的同时调动广大贡献者协作开发积极性.研究结果表明:在初始阶段非经济收益系数和保护强度的提高对遏制违约侵权现象具有显著作用,限制型许可协议占据大部分市场份额;演化第二阶段后续贡献者积极性不高,经济收益系数是影响初始贡献者策略选择的关键因素,限制型许可协议市场份额仍占据略微优势,对宽松型许可协议的抑制作用逐渐减弱;演化第三阶段随着保护强度和后续贡献者初始意愿的增加,初始贡献者选择宽松型许可协议策略的速度明显提高,此时宽松型许可协议市场竞争力更强,扩散速率更快.

关键词：数字开源社区开源许可协议违约侵权演化博弈 Lotka-Volterra模型

Influences of ±800 kV Yunnan-Guangdong HVDC System on Security and Stability of China Southern Power Grid

在线全文

学校读者我要写书评

暂无评论

Energy and Power Engineering 2013年第4期5卷 1230-1234页

作者： baorong zhou Xiaoming Jin Chao Hong Pei Zhang Zhigang Wu Electric Power Research Institute of China Southern Power Grid Guangzhou China South China University of Technology Guangzhou China Tianjin University Tianjin China

The interaction mechanism between AC and DC systems in a hybrid AC-DC transmission grid is discussed with PSS/E software. Analysis shows that receiving-end AC faults may cause much more damage on the HVDC system operation than the sending-end AC faults in a multi-infeed HVDC system, and the damage severity depends on the power recovering rate of the HVDC systems. For HVDC systems with slow power recovering rate, the receiving-end AC faults may probably be a critical factor to constrain power transfer limits. Larger capacity of HVDC system means not only higher power transfer-limit of the parallel connected AC-DC transmission grid, but also more expensive stabilizing cost.

关键词： HVDC Security Stability AC/DC Power System Interaction

基于临界阻抗边界的多馈直流系统同时故障风险评估

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

电网技术 2013年第3期37卷 874-878页

作者：陈政周保荣洪潮金小明南方电网科学研究院广东省广州市510080

目前多馈直流输电系统同时故障风险评估主要依赖时域暂态仿真扫描计算来确定,该方法计算量大,耗时长,难以满足系统规划运行方式灵活多变的应用需求。引入节点电压影响因子(voltage influencing factor,VIF)定义,推导建立换流站母线电压... 详细信息

目前多馈直流输电系统同时故障风险评估主要依赖时域暂态仿真扫描计算来确定,该方法计算量大,耗时长,难以满足系统规划运行方式灵活多变的应用需求。引入节点电压影响因子(voltage influencing factor,VIF)定义,推导建立换流站母线电压跌落比的节点阻抗表达式,以临界电压跌落阀值为判据,划出各直流换流站的临界故障阻抗边界,根据各直流的临界故障阻抗边界重叠情况可准确、快捷、直观地给出多馈直流系统发生同时故障的风险评估结论。通过实际系统的时域仿真结果对比,验证了该方法的有效性,可应用于电力系统规划、设计及运行等领域。

关键词：多馈直流节点阻抗换相失败同时故障风险评估

在线全文

学校读者我要写书评

暂无评论

计及激励型需求响应的微电网可靠性分析

电力系统自动化 2017年第13期41卷 70-78页

作者：周保荣黄廷城张勇军中国南方电网有限责任公司电网技术研究中心广东省广州市510623 华南理工大学电力学院广东省广州市510640

鉴于激励型需求响应能够引导用户调整用电行为、主动参与负荷削减,而微电网中的分布式电源及储能能为实施激励型需求响应提供响应时间,文中对计及激励型需求响应的微电网可靠性进行了重点研究。首先分析了激励型需求响应的机理及其对供... 详细信息

鉴于激励型需求响应能够引导用户调整用电行为、主动参与负荷削减,而微电网中的分布式电源及储能能为实施激励型需求响应提供响应时间,文中对计及激励型需求响应的微电网可靠性进行了重点研究。首先分析了激励型需求响应的机理及其对供电可靠性的影响,接着对激励型需求响应用户进行综合评估,建立了需求响应的调度模型。然后以用户收益最大为目标建立用户侧的响应模型,并提出了计及激励型需求响应的微电网负荷削减策略。最后基于蒙特卡洛模拟方法对改进的RBTS Bus6测试系统进行可靠性评估和经济性分析。算例结果验证了所建模型的有效性,证明了激励型需求响应能有效提高微电网的可靠性和经济性。

关键词：激励型需求响应微电网(微网) 可靠性负荷削减策略

Application of Risk-based Flexibility Assessment Methods to Evaluate System Expansion Plans

在线全文

学校读者我要写书评

暂无评论

Energy and Power Engineering 2013年第4期5卷 1022-1025页

作者： baorong zhou Pei Zhang Jianbin Chen Xiaoming Jin Kai Hou Ming Niu Zhao Xu Yunkai Lei Department of Electrical Engineering The Hong Kong Polytechnic University Hong Kong SAR China Electric Power Research Institute of China Southern Power Grid Guangzhou China Tianjin University Tianjin China

This paper proposed a flexibility assessment approach based on and risk assessment methodology. System planners prioritize each planning scheme with consideration of three aspects: reliability, economics, and flexibility. In the past, there is lack of quantitative indices to measure flexibility of a power system. This paper proposes applying probabilistic risk assessment method to quantify system flexibility. The proposed approach is demonstrated to compare two transmission planning schemes during Guangdong expansion planning process.

关键词： Flexibility Assessment Transmission Scheme Prioritization