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3rd Asia power and Electrical Technology Conference, APET 2024

作者： Wu, Yuhan Li, Yajie Shandong University Key Laboratory of Power System Intelligent Dispatch and Control The Ministry of Education Jinan China

ISBN: (纸本)9798350367690

With the increasing proportion of grid-connected renewable energy sources such as photovoltaic and wind power, the stability issues caused by large-scale development of new energy sources have become prominent. Among these issues, transient overvoltage is the primary constraint limiting the large-scale development of new energy sources. Studies have shown that the occurrence of transient overvoltage is closely related to the system strength of grid-connected points for new energy sources. The weaker the system strength, the greater the risk of stability problems such as transient overvoltage. The short-circuit ratio is an important indicator for assessing the grid strength of new energy integration points. Monitoring the short-circuit ratio can effectively evaluate the strength of the new energy station's integration into the system. Therefore, based on the short-circuit ratio of new energy generation stations, this paper quantitatively analyzes the relationship between the short-circuit ratio and transient overvoltage. In future research, the short-circuit ratio can be used as a constraint condition, with transient overvoltage as an indicator, to facilitate the determination of reactive power compensation solutions for high-proportion new energy integration systems. Finally, MATlab/simulink simulations validate the accuracy of the analysis. © 2024 IEEE.

关键词： Wind power integration

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A calculation method of electrical distance considering operation mode

A calculation method of electrical distance considering oper...

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International Seminar on Computer Science and Engineering Technology (SCSET)

作者： Peng, Peiqi Chen, Kai Xu, Taoyang Li, Changgang Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China

An electrical distance calculation method considering operation mode is proposed. Based on line impedance, Phase-angle difference between buses is taken into account to characterize strength of electrical connections. Derivation of electrical distance considering operation mode is introduced. Comparing with traditional impedance electrical distance calculation method, rationality of this method was verified. Electrical distance of IEEE 39 example system is calculated. To explain effect of operating mode on the electrical distance, electrical zone division of power system under different operation modes are compared.

关键词： Electric connectors

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Multitime Scale Active and Reactive power Coordinated Optimal dispatch in Active Distribution Network Considering Multiple Correlation of Renewable Energy Sources

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IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 2021年第6期57卷 5614-5625页

作者： Chen, Shuai Wang, Chengfu Zhang, Zhenwei Shandong Univ Sch Elect Engn Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China

To improve the adaptability for renewable energy sources (RES), a multitime scale optimal dispatch method, which considers the multiple correlations of RES, is proposed in the active distribution network (ADN). The proposed method includes a multiple correlation model of RES and a scheduling framework. The multiple correlation model of RES is formulated by t Copula function, Sklar's theorem, and conditional distribution of multivariate t distribution. The multiple correlation model can estimate the forecast error of the future period according to the historical data and the latest prediction. The scheduling framework further employs the revised forecast to coordinate the fast/slow-response regulation resources in the ADN under three timescales. In the day-ahead stage, the operation state of slow-response resources is optimized and determined. In the intraday stage, the output of the fast-response resource, which is transferred to the real-time stage as reference trajectory, is optimized based on the short-term prediction. In the real-time stage, the stochastic model predictive control is adopted to adjust the output of fast-response resources based on ultra-short-term prediction and reference trajectory. Case analyses indicate that the proposed method can effectively reduce the voltage fluctuation, promote the utilization of demand-side resources, and improve the system economic performance by introducing the multiple correlation model.

关键词： Correlation Reactive power Predictive models Renewable energy sources Stochastic processes Predictive control Job shop scheduling Active distribution network (ADN) forecast error multiple correlation multitime scale dispatch stochastic model predictive control (MPC)

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control of Parallel-Connected Modular Multilevel Converters

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IEEE TRANSACTIONS ON power ELECTRONICS 2015年第1期30卷 372-386页

作者： Gao, Feng Niu, Decun Tian, Hao Jia, Chunjuan Li, Nan Zhao, Yong Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China Shandong Elect Power Corp Jinan 250001 Peoples R China

The modular multilevel converter (MMC) is an emerging and highly attractive multilevel converter topology for high-voltage and high-power applications. This paper proposes the control method of parallel-connected modular multilevel converters (parallel-MMCs), which assumes that the multiple MMCs are directly connected at both ac and dc sides to effectively enhance the power rating as expected. Two key problems were first solved for the parallel-MMCs under the normal operation conditions: voltage balancing of submodules and mitigation of circulating currents, where the novel transformed third-order harmonic resonant controller in the synchronous reference frame was employed to mitigate the dominant second-order and fourth-order circulating currents and a sixth-order harmonic resonant controller is used to attenuate the zero-sequence sixth-order circulating current existed in all phase currents per MMC. Considering the high risk of switches fault in the parallel-MMCs, the fault-tolerant operation schemes were then proposed in this paper to address the major concerns of open-circuit and short-circuit switch fault in a submodule, respectively. Carefully controlling the healthy submodules and the corresponding phase arms, the parallel-MMCs can successfully maintain their balanced capacitor voltages and mitigate the circulating currents with the qualified output waveform obtained. In addition, the parallel configuration of MMCs provides the unique solution for the short-circuit switch fault operation which was seldom discussed in the published literature works with respect to the MMC fault-tolerant operation schemes. MATlab simulations and the constructed experimental prototype have verified the performance of the proposed control strategy.

关键词： Circulating current fault-tolerant operation modular multilevel converter (MMC) parallel operation pulse width modulation (PWM) compensation

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Fault current limiter for the MMC-based multi-terminal DC grids

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IET GENERATION TRANSMISSION & DISTRIBUTION 2020年第16期14卷 3269-3277页

作者： Huang, Qiang Zou, Guibin Sun, Weijie Xu, Chunhua Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China Weihai Elect Power Co Weihai Shandong Peoples R China

In the modular multilevel converter (MMC)-based multi-terminal high-voltage direct current (HVDC) system, the fault current rises rapidly due to sub-module capacitors discharging when a DC-side short-circuit fault occurs, which makes the MMC easily blocked for self-protection. To avoid the blocking of the converter station and lower the DC fault current, this study proposes a novel fault current limiter (FCL) for MMC-based multi-terminal DC grids. First, the fault current limiting circuit, which consists of resistance, capacitance and power electronic components is designed. Then, the operation principle of the FCL is analysed in detail. Afterwards, the startup criterion is constructed, and the selection method of the key parameters in the fault current limiting circuit is also introduced in order to prevent the converter station from blocking in the case of DC short-circuit fault. Finally, a simulation model was built using PSCAD/EMTDC software, and extensive simulation results verified the effectiveness of the proposed FCL.

关键词： power transmission control fault currents HVDC power convertors HVDC power transmission power electronics fault current limiters power grids voltage control power transmission faults power convertors DC short-circuit fault MMC-based multiterminal DC grids modular multilevel converter-based multiterminal high-voltage direct current system fault current rises DC-side short-circuit fault converter station DC fault current novel fault current limiter fault current limiting circuit

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Quantitative assessment of static voltage stability for power system with high-penetration wind power based on energy function

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ENERGY REPORTS 2024年 12卷 699-707页

作者： Zhang, Jian Ma, Ruicong Cao, Yongji Zou, Shihao Li, Changgang Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Peoples R China Shandong Univ Acad Intelligent Innovat Jinan 250101 Peoples R China

As the scale of power systems expands, the penetration of renewable energy sources and power electronic devices are accelerating. With the growing complexity of power system, there is an urgent need for in-depth research on the impact of reactive power on static voltage stability. This paper proposes a quantitative assessment approach of static voltage stability for the power system with high-penetration wind power based on the energy function. A quantitative assessment framework for voltage stability indices based on power flow analysis has been established. The classic static voltage stability index L based on reactive power has been comprehensively analyzed. Additionally, combining the energy function and power flow analysis, a new quantitative index for voltage stability based on bus reactive power injection has been proposed. Finally, the effectiveness of this index has been validated by case studies. With the increasing penetration of wind power, the trend of the change of the assessment index of voltage margin is analyzed.

关键词： Energy function power flow Quantitative assessment Static voltage stability Wind power

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Hierarchical control of mid-long term voltage stability in a hybrid multi-infeed HVDC system 16

Hierarchical control of mid-long term voltage stability in a...

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16th IET International Conference on AC and DC power Transmission, ACDC 2020

作者： Gong, Shuai Zhang, Wen Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan250061 China

ISBN: (纸本)9781839533914

With the emerging use of VSC-HVDC links, the hybrid multi-infeed HVDC (HMIDC) system that includes LCC-HVDC and VSC-HVDC links appears and is becoming a promising power transmission structure in modern power systems. In order to make full use of the fast power adjustment capability of VSC, mitigate commutation failures and keep the voltage stability of the AC power grid, this paper proposes a hierarchical control strategy of long-term voltage stability in a HMIDC system. The converter control coordinates control variables including VSC-HVDC reactive power, shunts, and inverter extinction angle to ensure safe operation of LCC-HVDC. The system level is a model predictive control based on trajectory sensitivity with the objective of minimizing the deviation of voltage trajectories and the control cost, which coordinates the AC and DC control variables to ensure the safe operation of the AC system. The simulation results of a HMIDC system show that the control method proposed in this paper can fully coordinate all kinds of control methods of AC/DC system, improve the long-term voltage stability of the system. © 2020 Institution of Engineering and Technology. All rights reserved.

关键词： HVDC power transmission

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Out-of-step Prediction for power system Using Improved Prony Algorithm 3

Out-of-step Prediction for Power System Using Improved Prony...

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3rd International Conference on Manufacturing and Industrial Technologies

作者： Shi, Fang Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Peoples R China

The development of the phasor measurement units (PMUs) and the wide-area measurement systems (WAMS) in power system provide abundant synchronous data for the new application. This paper proposes an online out-of-step monitoring and predicting scheme for the interconnected power systems based on the rotor angle measurement. The Prony algorithm is improved to predict whether and when a power swing will lead to out-of-step of the generator or the power systems. An energy-like weight coefficient approximation of the decomposed signals is introduced to maintain the accuracy and reliability of the model free dynamic prediction method. The effectiveness and applicability of the proposed scheme is illustrated using a 2-area-4- machine power system.

关键词： Forecasting

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Comprehensive comparisons between six-arm and nine-arm modular multilevel converter

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CPSS Transactions on power Electronics and Applications 2020年第2期5卷 135-146页

作者： Qin, Futian Gao, Feng Tang, Yi Wang, Jinyu Xu, Tao Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan250061 China The School of Electrical and Electronic Engineering Nanyang Technological University Singapore639798 Singapore

Nine-arm modular multilevel converter (9A-MMC) is a compact modular multilevel converter (MMC) with two sets of three-phase output terminals, and it can be regarded as the integration of two conventional six-arm modular multilevel converters (6A-MMC) with double function middle arms. Compared with two 6A-MMCs, the required submodules (SMs) in 9A-MMC can be reduced, however, there will be some performance tradeoffs, and the performance tradeoffs of 9A-MMC have not yet been investigated in detail. Hence, this paper gives the comprehensive comparisons between 6A-MMC and 9A-MMC, including the required SMs number, the current stress of the semiconductor device, the maximum capacitor voltage ripple, and the power losses of the whole system. This paper can be a guide to make the best use of the advantages and avoid the disadvantages of 9A-MMC. Finally, the simulation results verify the mathematical analysis of the comparisons. © 2021 All rights reserved.

关键词： Semiconductor devices

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Probabilistic Wind Generation Forecast Based on Sparse Bayesian Classification and Dempster-Shafer Theory 51

Probabilistic Wind Generation Forecast Based on Sparse Bayes...

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51st Annual Meeting of the IEEE-Industry-Applications-Society (IAS)

作者： Yang, Ming Lin, You Han, Xueshan Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250100 Peoples R China

ISBN: (纸本)9781479983933

Probabilistic wind generation forecast results are crucial for power system operational dispatch. In this paper, a nonparametric approach for short-term probabilistic wind generation forecast based on the sparse Bayesian classification (SBC) and Dempster-Shafer theory (DST) is proposed. This approach is composed by the following four steps: Firstly, a spot forecast of wind generation is performed based on Support Vector Machine (SVM);Secondly, the range of SVM forecast error is discretized into multiple intervals, and the conditional probability of each interval is estimated by a sparse Bayesian classifier;Thirdly, DST is applied to combine the probabilities of all the intervals to form a unified probability distribution function of the SVM forecast error;Lastly, the probability distribution function of wind generation is achieved by combining the SVM wind generation spot forecast result and corresponding forecast error distribution. The distinguishing features of the proposed approach are as follows: (a) The approach is a nonparametric one and the forecast error caused by the misjudgement of probability distribution type can be avoided;(b) The proposed approach has good generalization capability by using the sparse learning mechanism;and (c) The range constraint of wind generation can be systematically considered in the approach by applying DST. Tests on a 74-MW wind farm illustrate the effectiveness of the proposed approach.

关键词： Probabilistic wind generation forecast nonparametric approach Support Vector Machine sparse Bayesian classification Dempster-Shafer theory

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