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A coupling voltage based adaptive reclosing scheme for flexible DC grid

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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Analytical monodromy matrix method for small-signal stability analysis of grid-connected modular multilevel converter systems

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2025年 164卷

作者： Jia, Xiaofan Ye, Hua Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China Shandong Res Inst Ind Technol Jinan 250101 Peoples R China

The modular multilevel converter (MMC) has been widely used in high-voltage/high-power applications, e.g., high-voltage direct current transmission. However, its nonlinear time-periodic nature leads to complex harmonic interactions and then complicates the small-signal stability modeling and analysis of grid-connected MMC systems. To address this, the linear time-periodic (LTP) theory and the Floquet theory-based monodromy matrix method are applied in this paper. First, an analytical expression of the monodromy matrix (i.e., the state transition matrix over a period) for the LTP model of grid-connected MMC systems is constructed by applying the Chebyshev collocation method. In addition to avoiding time-consuming numerical integration, the analytical matrix facilitates to perform the derivative-based eigenvalue sensitivity analysis. Then, the system free-response solution is efficiently computed by means of a set of analytical state transition matrices. The effective oscillation components in critical LTP modes and relative contributions thus can be identified. On this basis, the participation factor analysis and damping ratio analysis can be performed to gain insightful characterization of system dynamics. The correctness and effectiveness of the proposed method are verified on an exemplary grid-connected MMC system by both numerical and experimental results.

关键词： Floquet characteristic multiplier (FCM) Linear time-periodic (LTP) system Modular multilevel converter (MMC) Monodromy matrix method Small-signal stability

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Coordinated Distributionally Robust Optimal Allocation of Energy Storage system for HV-MV Distribution Network Resilience Enhancement

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IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 2025年第2期61卷 2011-2024页

作者： Cao, Kuan Liu, Yutian Wang, Chunyi Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China State Grid Shandong Elect Power Co Dev Planning Dept Jinan 250001 Peoples R China

To solve the problem of power imbalance under extreme and normal scenarios in high voltage (HV) and middle voltage (MV) distribution networks with high penetrations of photovoltaic (PV), the paper proposes a distributionally robust optimal allocation method of energy storage system (ESS) for equilibrating resilience and economy. Firstly, due to the strong relation between resilience enhancement and ESS location, the siting-sizing sequential updating method is adopted to site ESS based on the planning resilience indexes. Secondly, to generate normal and extreme PV-load scenarios with continuous labels, an adversarial autoencoder (AAE) combined with transfer learning is improved by introducing the conditional neural network. Based on the improved AAE and clustering techniques, a Kullback-Leibler divergence-based ambiguity set is constructed to characterize the joint probability distribution of PV and load. Thirdly, considering the boundary information interaction of HV-MV distribution networks, a two-stage coordinated distributionally robust optimization model is established to size ESS. In the model, centralized ESS in HV distribution network participates in frequency regulation and peak shaving while distributed ESS in MV distribution network regulates voltage profiles in the four-quadrant mode. For further improving resilience, an operational resilience index as a chance constraint considering extreme scenarios is embedded into the model. Fourthly, the C&CG algorithm is nested into the analytical target cascading method to handle the model. Finally, case studies show that the proposed method can effectively balance resilience enhancement and economic operation.

关键词： Adversarial autoencoder distributionally robust optimization ESS allocation ESS allocation HV-MV distribution network HV-MV distribution network resilience resilience resilience

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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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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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Transient Synchronizing Stability Quantitative Assessment of Converter-Based Resources by Basin of Attraction 11

Transient Synchronizing Stability Quantitative Assessment of...

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11th China International Conference on Electricity Distribution, CICED 2024

作者： Ma, Rui Zhang, Hao Hao, Quanrui School of Electrical Engineering Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan China

ISBN: (纸本)9798350368345

As the converter-based renewable power generation has been extensively integrated into grid, the transient synchronizing stability accidents of gird induced by voltage source convert (VSC) are emerging more and more frequently and severely. In this paper, the transient synchronizing dynamics of the VSC are depicted by a reduced-order model. Then, its transient synchronizing stability is examined and analyzed by the large-signal basin of attraction (BOA) of the VSC. The system shows two kinds of boundaries of the BOA under different parameters, including the closed-loop area and the fish-like area. The boundary of the closed-loop area is depicted by the equipotential plane estimation based on the energy function. The boundary of the fish-like area is estimated through the method of hyperplane in the first quadrant. Meanwhile, the transient synchronizing stability criteria can be established based on the estimated boundaries and the numerically integral fault trajectories. Furthermore, the critical clearing angle (CCA) is analytical calculated through the analytically derived fault trajectory under the worst fault conditions. Meanwhile, the critical clearing times (CCT) can also be analytical calculated. Both the analytical CCA and CCT can provide enough margin for the transient control and protection. Finally, several simulations have verified the effectiveness and accuracy of the proposed method in MATlab. © 2024 IEEE.

关键词： Transient stability

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Anomaly Detection of Wind Turbine Generator Based on LSTM and Kshape Clustering

Anomaly Detection of Wind Turbine Generator Based on LSTM an...

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

作者： Jin, Zheyu Yang, Ming Zeng, Xiangjun Feng, Chen Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China

ISBN: (纸本)9798350339345

Anomaly detection of wind turbine generators helps to detect faults of related components in advance, thus improving the economy and reliability of wind farm operation. This paper presents a generator anomaly detection method using long short-term memory neural network (LSTM) and Kshape clustering algorithm. This work first considers the characteristics of wind turbine supervisory control and data acquisition(SCADA) data, proposes a feature analysis method combining correlation coefficients and feature ranking, then the Kshape clustering algorithm is used to select wind turbines with similar operating states to expand the training dataset. Anomaly detection state estimation model is constructed by combining well-performanced LSTM models trained by selected units' dataset. Finally, the feasibility and accuracy of the proposed method are verified based on the SCADA data of actual wind farms.

关键词： wind turbine generator anomaly detection similarity long short-term memory neural network (LSTM)

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Decentralized Coordinated Robust dispatch of Multi-area Interconnected Integrated Electricity and Heating system

Decentralized Coordinated Robust Dispatch of Multi-area Inte...

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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 Han, Longxiao Wang, Qiushi Yu, Yixiao Li, Menglin Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan Peoples R China

ISBN: (纸本)9798350339345

With the continuous expansion of wind power generation, wind power curtailment is becoming increasingly serious. In order to improve wind power accommodation capacity, more flexibility resources that can be utilized by electrical power system (EPS) need to be identified. This paper proposed a decentralized coordinated robust dispatch model of multi-area integrated electricity and heating system (IEHS), considering the dynamic characteristics of district heating network (DHN) and flexibility from interconnected IEHS transferred though tie-line. Meanwhile, the risk of wind power accommodation is also considered to balance the operational costs and risk costs. The alternating direction multiplier method (ADMM) is applied to solve the coordinated robust dispatch of multi-area IEHS. The results of the case studies show that the proposed model can optimize the allocation of power generation and flexibility resources in multi-area interconnected system, realize multi-area interconnected system flexibility sharing and effectively reducing operating costs.

关键词： Integrated electricity and heating system dynamic haracteristics coordinated dispatch decentralized multi-area interconnected system

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Black Start Scheme of Wind-storage Combined system Based on Virtual Synchronous Generator control 2

Black Start Scheme of Wind-storage Combined System Based on ...

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2nd Asia Conference on Electrical, power and Computer Engineering, EPCE 2023

作者： Wang, Hao Wang, Hongtao Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China

ISBN: (纸本)9798350310818

With a high proportion of wind power generations connected to the grid, wind power generation is expected to be a black-start source. This paper proposed a black start scheme based on virtual synchronous generator (VSG) control for wind-storage combined system. The energy storage inverter was transformed into a VSG with the secondary frequency regulation ability by improved frequency synchronous control (IFSC), and a conventional VSG controller was designed for the rotor side inverter of doubly fed induction generator. And a control mode switching device was designed for the energy storage in order to maintain the grid stability after black start. This paper built the model of wind-storage combined system on the Matlab/Simulink for black start simulation. The simulation results show that the maximum frequency deviation is 68.75% lower than the conventional control when the ancillary machines of wind turbines were restored. What's more, the maximum frequency deviation shall not exceed 0.12%, and the maximum voltage deviation shall not exceed 8% during the black start process and the controllers can realize no-error frequency adjustment. Finally, control mode switching device can smoothly switch IFSC to VSG. Thus, the effectiveness of the proposed black start scheme and controllers are verified. © 2023 IEEE.

关键词： controllers

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