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IEEE PES General Meeting

作者： Cheng, Fenglu Yang, Ming Han, Xueshan Liang, Jun Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China

ISBN: (纸本)9781479964154

As the regulating range is limited in the real-time dispatch, the security improvement is more prominent than the economic improvement for the real-time dispatch. Based on the preemptive goal programming and the steady-state security region estimation methods, this paper proposed a model for the real-time dispatch, in which the base-points and the participation factors of the AGC (Automatic Generation control) units are co-optimized. The model has two goals. One is to maximize the ability of the power system to depress the load disturbances by maximizing the overlap region of the steadystate security region and the load variation region (named as the effective steady-state security region). The other one is to minimize the operating costs including the generation costs and the reserve costs. By setting the first goal as the preemptive goal, the economic dispatch results are obtained with respected to the maximized effective steady-state security region. Numerical tests demonstrate the effectiveness of the proposed approach.

关键词： power systems robust dispatch real-time dispatch steady-state security region

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A coupling voltage based adaptive reclosing scheme for flexible DC grid

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IET GENERATION TRANSMISSION & DISTRIBUTION 2023年第5期17卷 1007-1020页

作者： Wei, Xiuyan Zou, Guibin Zhang, Shuo Zhang, Chengquan Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ 17923 Jingshi Rd Jinan 250061 Shandong Peoples R China

The total electric field around the DC line is composed of both the ion flow field produced by coronae and the electrostatic field produced by the conductor charge. Under the effect of the total electric field, the disconnected pole will generate a coupling voltage. Therefore, based on the coupling voltage, this paper proposes an adaptive reclosing scheme for flexible DC grid to prevent power supply interruption caused by temporary fault. First, the disconnected pole coupling voltage (DPCV) under the total electric field is analysed when single pole to ground fault (SPGF) and pole to pole fault (PPF) occur respectively. Then, according to the DPCV difference between permanent fault and temporary fault, a fault property identification (FPI) criterion is constructed. The scheme is very simple and not affected by the transition resistance, fault position and wiring mode which has high reliability. Compared with the non-selective reclosing strategy, the adaptive reclosing scheme can avoid the secondary impact on the system from the permanent fault. Extensive simulations and experiments verify the effectiveness of the proposed adaptive reclosing strategy.

关键词： disconnected pole coupling voltage Distribution networks power transmission protection power transmission faults adaptive reclosing strategy nonselective reclosing strategy power system protection circuit breakers ion flow field pole fault temporary fault DC line fault property identification criterion fault position flexible DC grid total electric field electrostatic field earthing fault location permanent fault power distribution faults power grids power electronics, supply and supervisory circuits power engineering computing d.c. transmission single pole Switchgear adaptive reclosing scheme HVDC power convertors

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Distribution Network Cost Allocation Based on Nodal Price

Distribution Network Cost Allocation Based on Nodal Price

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2018 International Conference on Innovative Smart Grid Technologies, ISGT Asia 2018

作者： Qiao, Liang Zhang, Li Gao, Haohan Key Laboratory of Power System Intelligent Dispatch and Control MOE Shandong University Jinan China

ISBN: (纸本)9781538642917

!The operation and trade of the electricity distribution market must develop based on a clear distribution pricing mechanism. Current nodal price generally does not include distribution network costs, which is not conducive to the establishment of distribution market and the efficient use of distribution network. Therefore, based on the Ramsay criterion and further considering the influence of reactive power, a method of allocating the distribution network cost to the nodal price is proposed in this paper. The main innovation in this paper is that a calculation method of price elasticity of reactive power demand is established. Consequently, the cost of the distribution network is allocated to the nodes according to not only active power distributed but also reactive power distributed. A 12-node system modified from the IEEE 33-node distribution network is used to do simulation. Results validate the feasibility and effectiveness of the method. Moreover, comparative analysis with MW-Mile method shows that the method can provide better economic information for network users. © 2018 IEEE.

关键词： Reactive power

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Status Evaluation of Secondary system in intelligent Substation 2

Status Evaluation of Secondary System in Intelligent Substat...

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2017 IEEE 2nd Information Technology, Networking, Electronic and Automation control Conference (ITNEC 2017)

作者： Fanbin Zhang Zhanjun Gao Yao Zhao Yan Zhao Key Laboratory of Power System Intelligent Dispatch and Control (Shandong University) Ministry of Education State Grid Shandong Electric Power Company

ISBN: (纸本)9781509064151;9781509064144

With the rapid development of intelligent substation, the continuous progress of the condition-based maintenance of intelligent substation has already become very urgent. Status evaluation is the main stage of condition-based maintenance. Its purpose is to determine the health status of the equipment, and be able to timely maintenance before the failure occurred. The paper focuses on the research on the status evaluation methods. This paper makes clear the scope of the evaluation and establishes a evaluation system of secondary system in intelligent substation on condition of the existing standards and research. It uses fuzzy mathematical algorithm to establish the evaluation algorithm model. Meanwhile, it introduces two new fuzzy sets to evaluate its status more accurately. This paper also uses the method of BP artificial neural network to determine the weight of each kind of evaluation index, and finally it completes the evaluation of the secondary system in intelligent substation.

关键词： intelligent substation status evaluation secondary system fuzzy mathematical algorithm BP neural network

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A single-ended protection method for flexible DC distribution grid

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IET GENERATION TRANSMISSION & DISTRIBUTION 2023年第11期17卷 2600-2611页

作者： Wei, Xiuyan Zou, Guibin Zhang, Shuo Chen, Chaochao Xu, Chunhua Sun, Weijie Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China State Grid Weifang Power Supply Co Weifang Peoples R China State Grid Weihai Power Supply Co Weihai Peoples R China Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China

Considering that no current limiting inductances (CLIs) are installed at the end of the DC line in the flexible DC distribution grid, the protections relying on line boundary are no longer applicable. To overcome this problem, the paper proposes a single-ended protection method independent of line boundary. Firstly, the Peterson equivalent circuit is applied to analyze the amplitude-time ratio of initial voltage travelling wave (ARIVTW) under internal and external faults. Secondly, the fault direction criterion based on the fault component current and the fault type criterion based on the pole voltage are built. Subsequently, the fault identification criterion is constructed by using the ARIVTW, and the corresponding protection method is formed. Finally, the flexible DC distribution grid is built in PSCAD to verify the proposed method. The simulation results show that the method is robust to fault resistance and noise. Besides, the method realizes the protection of the whole line, which has good selectivity and engineering applicability.

关键词： current limiting inductance DC distribution grid line boundary single-ended protection travelling wave

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Cluster partition method of high-penetration distributed photovoltaics for autonomous operation and control of distribution network 5

Cluster partition method of high-penetration distributed pho...

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2023 5th International Conference on Information Science, Electrical, and Automation Engineering, ISEAE 2023

作者： Huang, Manlin Ye, Hua Ye, Peile Mou, Qianying Zhang, Wen Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (纸本)9781510667440

With the widespread integration of distributed photovoltaics (PV), it is urgent to realize the autonomous operation and control of distribution networks with high-penetration PVs. Due to the complex structure of the power system, the cluster management model has emerged. The perquisite lies in intentionally partitioning the network into several clusters. For this purpose, this paper proposes a cluster partition method of distribution networks with high-penetration of PVs. First, a comprehensive performance index for partitioning is proposed. The comprehensive performance index fully considers the degree of intra-cluster node connectivity, power balance and communication cost of clusters. Further, an improved genetic algorithm is applied in this paper to search for the optimal partition scheme. Finally, the effectiveness and rationality of the proposed method have been demonstrated in the IEEE 33-bus distribution network. © COPYRIGHT SPIE. Downloading of the abstract is permitted for personal use only.

关键词： Electric power distribution

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Travelling wave pilot protection for LCC-HVDC transmission lines based on electronic transformers' differential output characteristic

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2017年第Dec.期93卷 283-290页

作者： Wang, D. Gao, H. L. Luo, S. B. Zou, G. B. Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control 17923 Jingshi Rd Jinan 250061 Shandong Peoples R China

Considering travelling wave's bandwidth which varies from several kilohertz to hundreds of kilohertz, traditional current and voltage transformers cannot transfer whole bandwidth of travelling wave. However, electronic transformers, including Rogowski coil based electronic current transformer and capacitance divided electronic voltage transformer, have much wider bandwidth (up to 500 kHz) which could transfer almost whole bandwidth of travelling wave without distortion. Besides, secondary side's output of electronic transformer is the differential signal of primary side. So, the integration circuit can be omitted when using differential travelling wave signal directly in protection principle. Traditional travelling protection for high voltage direct current (HVDC) lines is highly affected by grounding resistance. And the backup protection, such as current differential protection, has long operation time. So the paper proposes a novel travelling wave pilot protection based on the differential output signal of electronic transformers. Differential voltage and current travelling wave have axisymmetric relationship when the fault occurs at forward direction. Conversely, differential voltage and current travelling wave almost overlap when the fault occurs at reverse direction. Considering fault direction identification results of two ends, fault section can be determined. Besides, according to amplitude ratio of fault line and normal line, fault line can be selected correctly. The simulation results in PSCAD/EMTDC prove the correctness, sensitivity and reliability. (C) 2017 Elsevier Ltd. All rights reserved.

关键词： Travelling wave pilot protection Rogowski coil based electronic current transformer Capacitance divided electronic voltage transformer Differential output PSCAD/EMTDC

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Robust dispatch of IEHS Considering Interaction Mechanism between Multiple DHNs and EPS

Robust Dispatch of IEHS Considering Interaction Mechanism be...

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IEEE/IAS Industrial and Commercial power system Asia (IEEE I and CPS Asia)

作者： Jiao, Min Li, Peng Yang, Ming Wang, Qiushi Yu, Yixiao Li, Menglin Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China

ISBN: (纸本)9798350339345

District heating network (DHN) can provide flexibility for electrical power system (EPS) by utilizing heat storage capacity. First, the long-term balance between heat supply and demand must be considered. Thus, this paper defines two operating periods of DHN, including flexibility providing period (FPP) and flexibility recovery period (FRP). A DHN flexibility-providing model is designed. On the basis of proposed flexibilityproviding model, a flexibility interaction mechanism between multiple DHNs and EPS is proposed. Considered the interaction mechanism, an integrated electricity and heating system (IEHS) robust dispatch model is proposed, which takes into account the flexibility supply capacity and operating costs of the system. Finally, the effectiveness of the proposed model is verified by case studies.

关键词： Integrated electricity and heating system district heating network flexibility quantification interaction mechanism

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Application of Python Parallel Computing in Online Identification of Thevenin Equivalent Parameters

Application of Python Parallel Computing in Online Identific...

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3rd IEEE Student Conference on Electrical Machines and systems (SCEMS)

作者： Meng Xinyuan Wen Tao Ma Kaigang Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China

ISBN: (数字)9781728156224

ISBN: (纸本)9781728156224

The premise of analysing static voltage stability of large power grids online is identifying Thevenin equivalent parameters rapidly and accurately. And based on the current reaearch in this field, this paper analyses its formation mechanism and the feasibility of parallel programming in Python. The simulation test and analysis are carried out on the actual system. The results demonstrate that parallel programs can reduce the calculating time of Thevenin equivalent parameters significantly, make full use of computer performance and improve CPU utilization futher.

关键词： thevenin equivalent parameters python parallel programs

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A Pilot Protection Method for Active Distribution Networks Based on Protected Line Model

A Pilot Protection Method for Active Distribution Networks B...

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58th IEEE/IAS Industrial and Commercial power systems Technical Conference Asia (IEEE I and CPS Asia)

作者： Wang, Zeclian Cong, Wei Chai, Qingfa Lv, Jing Chai, Yanan Control Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China

ISBN: (数字)9781665450669

ISBN: (纸本)9781665450669

After Distributed Generations were connected to the distribution network on a large scale, the traditional singleended radial distribution network structure became an active distribution network structure, which affected the sensitivity and reliability of traditional protection methods. Therefore, a new pilot protection method for active distribution network based on the protected line model is proposed in this paper, which determines whether the protected line model is integrity according to whether the waveforms are similar. The protection units on both sides of the line compare the waveform similarity between the respective measured voltages and the referenced voltages, then compare the fault location judgment results on both sides, and then make an accurate judgment on whether the protected line has internal or external faults. Finally, the active distribution network model was built in PSCAD/EMTDC simulation software. The simulation results show that the method proposed in this paper can accurately identify internal and external faults, has high reliability and good applicability, and is less affected by noise.

关键词： active distribution network protected Line model cosine similarity fault detection pilot protection

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