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Frequency Domain Stability Analysis and Simulation of New Energy Power Generation systems 9

Frequency Domain Stability Analysis and Simulation of New En...

引用

9th Asia Conference on Power and Electrical Engineering, ACPEE 2024

作者： Wang, Haobo Wang, Hongtao Xin, Peiqi Song, Zhen Shandong University Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China

ISBN: (纸本)9798350309638

Stability analysis of grid-connected inverters is advanced through impedance analysis in this study, which leads to the development of a comprehensive mathematical model and simulation. control parameters, notably the voltage inner-loop control parameter Kv, the proportional gain Kp of the phase-locked loop (PLL), and the integral gain K1, were meticulously adjusted to assess their effects on subsynchronous oscillations. It was determined that while the proportional gain p and integral gain K1 have a marginal impact on sub-synchronous oscillations, the voltage inner-loop control parameter K1 significantly influences these oscillations. The insights gained from this analysis contribute to a deeper understanding of, and potential solutions for, synchronous oscillation issues. The ability to mitigate such oscillations facilitates the integration of a higher proportion of renewable energy sources, thereby enhancing the stability and reliability of the electrical power system. This enhancement is of critical importance in the pursuit of sustainable energy transitions and the advancement of clean energy sources. © 2024 IEEE.

关键词： Phase locked loops

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An Open Source Simulation Toolkit for Large-Scale Electrical Power system Static and Dynamic Studies

An Open Source Simulation Toolkit for Large-Scale Electrical...

引用

2020 IEEE/IAS Industrial and Commercial Power system Asia, I and CPS Asia 2020

作者： Li, Changgang Wu, Yue Zhang, Hengxu Liu, Yutian Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan China

ISBN: (纸本)9781728143033

This paper is an overview of Simulation Toolkit of Electrical Power systems (STEPS). STEPS is an open-source toolkit designed for the education of power system simulation. STEPS has an independent kernel which is coded in C++ to achieve better computational efficiency. STEPS also provides a python module named stepspy to provide higher-level functions to simplify the operations. Power flow solution is implemented and options are included in STEPS to maintain a balance between speed and convergence. Based on the power flow solution, dynamic simulation of large-scale systems with renewable sources is also implemented in STEPS. Abundant additional options are provided to achieve better accuracy and speed. Detailed steps to install STEPS, approaches to use stepspy, and the way to use Python paralleling computing are discussed. Cases are given to show the performance of the power flow options provided in STEPS. Dynamic simulation and efficiency of Python parallel when generating samples for research are also presented in this paper. © 2020 IEEE.

关键词： Python

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Aggregated Power Flexibility of Active Distribution Network Considering Reliability and Uncertainty

Aggregated Power Flexibility of Active Distribution Network ...

引用

2020 IEEE/IAS Industrial and Commercial Power system Asia, I and CPS Asia 2020

作者： Song, Yichen Wang, Mingqiang Wang, Mengxia Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (纸本)9781728143033

With the emergence of more and more distributed energy sources (DERs) in distribution network, the traditional distribution network is changing from passive to active, and it is expected to be capable of providing flexibility for transmission system. To effectively quantify the aggregated power flexibility of active distribution network (ADN) provided to upstream gird, the situation inside ADN must be respected. This paper proposes two aggregated power flexibility quantification models considering the uncertainties of DERs and load, and the reliability in ADN. The uncertainties are modelled by distributions and the system reliability is guaranteed by the expected energy not supplied (EENS) constraint. The optimization is solved by mixed integer linear programming (MILP). The performance of the proposed method is tested on the modified IEEE 33-bus distribution system. © 2020 IEEE.

关键词： Integer programming

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Forecast of Power Grid Asset Investment and Production Cost Based on Regression Analysis

Forecast of Power Grid Asset Investment and Production Cost ...

引用

2021 IEEE Sustainable Power and Energy Conference, iSPEC 2021

作者： Ma, Yue Chu, Xiaodong Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education jinan China

ISBN: (纸本)9781665414395

During the past 13th Five-Year Plan period, China's power grid development has made major achievements that proportion of new energy power generation has continued to increase, and major breakthroughs have been made in power electronic technology and high-voltage direct current transmission. With the continuous applications of new technologies in the power system, transmission and distribution losses are reduced, operation efficiency of power grid is significantly improved in order to adapt to the new changes in the power grid, power grid asset investment (PGAI) and production cost (PC) have also shown a new trend along with the development of the power grid. Predicting the PGAI and PC of modern power grids is of great significance for power grid asset management, development trend forecasting and investment decision-making. A forecast method is proposed for PGAI and PC based on regression analysis in this paper. The case study results of a provincial power grid verify the effectiveness of proposed forecast method. © 2021 IEEE.

关键词： Investments

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Ill-conditioned Problem of Fault Location Equations for Three-Terminal Lines in Distribution Network by μMPMU

Ill-conditioned Problem of Fault Location Equations for Thre...

引用

2022 Power system and Green Energy Conference, PSGEC 2022

作者： Zhang, Junpeng Meng, Xinyuan Wang, Rundong Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan China

ISBN: (数字)9781665499934

ISBN: (纸本)9781665499934

Three terminal line is a typical structure in distribution network, and its fault location has been the focus because of the large scale distributed generation integration. Recently, a parameter-free fault location method based on line voltage was proposed, which overcomes the problem that line parameters are unknown and only two line voltages can be measured in distribution network of China. Although it is more practical than previous methods, the RTDS test shows that the location equations of this method have ill-conditioned problems, that is, tiny measurement error causes too large deviation in the result. To study this problem, the ill-conditioned problem of the location equations is analyzed by condition number at first. Then the condition number of the location equations is calculated by simulation, and it is verified that the location results will produce a large error in the condition of small error of PSCAD simulation data and μMPMU measurement data from RTDS device. © 2022 IEEE.

关键词： Errors

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Short-Term Wind Power Forecasting Based on VMD-QPSO-LSTM 4

Short-Term Wind Power Forecasting Based on VMD-QPSO-LSTM

引用

4th IEEE International Conference on Power, Electronics and Computer Applications, ICPECA 2024

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

ISBN: (纸本)9798350359589

The unpredictable and highly variable nature of wind power generation demands advanced predictive models to enhance the operational stability of power systems under non-stationary wind conditions. This study presents an innovative approach for short-term wind power prediction, ingeniously integrating Variational Mode Decomposition (VMD), Quantum Particle Swarm Optimization (QPSO), and Long Short-Term Memory (LSTM) network into a cohesive forecasting methodology. Initially, VMD is applied to deconstruct wind power data into distinct sub-modes, thus reducing data complexity and facilitating more accurate analysis. The LSTM model is then fine-tuned using QPSO to refine its hyperparameters, thereby optimizing forecast performance. Each sub-mode is forecasted through a specialized LSTM model, and the collective forecasts are compounded to form the final prediction. Comparative analyses with conventional LSTM, PSO-enhanced LSTM, and QPSO-LSTM models reveal that our proposed VMD-QPSO-LSTM approach yields significantly higher accuracy in forecasting, highlighting its potential to efficiently navigate the uncertainties associated with wind power generation. © 2024 IEEE.

关键词： deep learning long short-term memory network variational mode decomposition wind power forecasting

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Improvement of stability and speed for BOTDR strain measurement

Improvement of stability and speed for BOTDR strain measurem...

引用

第六届地质(岩土)工程光电传感监测国际论坛

作者： Qing Bai Baoquan Jin Yu Zhang Yu Wang Dong Wang Yuncai Wang Key Laboratory of Advanced Transducers and Intelligent Control Systems(Ministry of Education and Sha Key Laboratory of Advanced Transducers and Intelligent Control Systems(Ministry of Education and Sha

A Brillouin optical time domain reflector(BOTDR)is commonly used for strain measurement in geological health *** a conventional BOTDR,an electro-optic modulator(EOM)is generally utilized to produce the pulse probe ***,the frequent fluctuation of the EOM optimal working point will deteriorate the extinction ratio(ER)and eventually result in the instability of BOTDR measurement ***,a scheme for stably generating the pulse probe light is proposed based on a semiconductor optical amplifier(SOA).Firstly,a SOA is used to produce the probe pulse light launched into the sensing fiber,and coherent detection is designed to obtain the beat signal of the Brillouin scattering and the reference *** the microwave frequency-sweeping method and the Levenberg-Marquardt(LM)algorithm are applied to determine the Brillouin frequency shift distribution along the sensing ***,a customed compact software core of LM fitting is developed with basic C code to speed the data *** experiment results show that the BFS measurement accuracy of ±3.74MHz is achieved over a 10.7-kilometer sensing fiber with the spatial resolution of 1.2m,meanwhile the average data processing time is reduced to about 233ms,about 45 times compared to that when using the LabVIEW,which indicates the stable and fast BFS measurement is realized.

关键词： BOTDR strain measurement extinction ratio semiconductor optical amplifier optical fiber sensing

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Combined Rotor-Side and Grid-Side Suppression of Sub-Synchronous Oscillation in Doubly-Fed Wind Turbines 7

Combined Rotor-Side and Grid-Side Suppression of Sub-Synchro...

引用

2024 7th International Conference on Mechanical, Electrical and Material Application, MEMA 2024

作者： Wang, Haobo Wang, Hongtao Xin, Peiqi Xu, Changmeng Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

In the field of wind power generation, the significant geographical separation between wind farms and load centers often necessitated the long-distance and large-scale transmission of wind energy, which was typically achieved through transmission lines equipped with series compensation capacitors. However, this setup led to interactions between the series compensation capacitors and the control systems of doubly-fed induction generators (DFIGs), potentially causing sub-synchronous oscillations in grid-connected systems. To address this issue, our study focused on a DFIG-based wind farm interconnected via a series-compensated line. We proposed an innovative suppression strategy that incorporated additional virtual damping on the grid side. This strategy was effectively combined with an ancillary approach of adding virtual inductance on the rotor side, offering a robust solution to mitigate sub-synchronous oscillations. The simulation results showed that the joint application of these two strategies was more effective than implementing them individually. Notably, the strategy involving additional virtual damping on the grid side outperformed the approach of adding virtual inductance on the rotor side. © Published under licence by IOP Publishing Ltd.

关键词： Inductance

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Transient Stability Analysis and Enhancement of Virtual Synchronous Generator with Current Limiter 7

Transient Stability Analysis and Enhancement of Virtual Sync...

引用

7th IEEE International Electrical and Energy Conference, CIEEC 2024

作者： Wang, Yantuan Ye, Hua Yang, Jialun Chu, Xiaodong Mou, Qianying Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

ISBN: (纸本)9798350359558

The modern power system exhibits a double high characteristic, where the physical structure and control strategies of power electronic devices have altered the stability characteristics of the modern power system. This paper investigates the transient instability issue faced by virtual synchronous generators (VSG) equipped with a current limiter during grid faults. Firstly, the transient stability model of the VSG is established. Then, the equal-area criterion (EAC) is employed to reveal the mechanism of transient instability in VSG and elucidate the influence of the current limiter on the transient stability of VSG. Based on this analysis, current angle configuration methods are further proposed to enhance the transient stability of VSG. Finally, the correctness of the mechanism analysis and proposed methods is validated through simulation. © 2024 IEEE.

关键词： Synchronous generators

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An Integrated Energy system Operation Model Considering New Electricity Marketing Strategy 5

An Integrated Energy System Operation Model Considering New ...

引用

5th International Conference on Energy, Electrical and Power Engineering, CEEPE 2022

作者： Liu, Shuai Wang, Mingqiang Lian, Xiaoyang Hu, Yuxi Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Jinan China

ISBN: (纸本)9781665479059

In recent years, the economic operation of Integrated Energy system (IES) has been widely concerned. How to determine the energy price has become an urgent problem to be solved of IES. In order to overcome this problem, a modified IES operation model considering new electricity marketing strategy is proposed. In this model, the combined stochastic/robust optimization (S/RO) is established to minimize the sum of electricity exchange cost, fuel purchasing cost, operating cost, flexibility adjustment cost and renewable curtailment cost. Based on the bounded uncertainty-based robust optimization (BURO), the modified IES operation model is transformed into a mixed integer linear programming (MILP) model, which is solved by CPLEX solver. The feasibility and effectiveness of the proposed model are illustrated on the IEEE 33-node distribution system with 11-node heat-cold system. © 2022 IEEE.

关键词： Heating systems Renewable energy sources Power engineering Costs systems operation Stability analysis Probability distribution

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