This page has only limited features, please log in for full access.
The virtual synchronous generator (VSG), which emulates the essential behavior of the conventional synchronous generator, has attracted great attention. This paper proposes to analyze the harmonic resonance characteristics in VSG using the state-space model. The analysis is based on a full-order state-space small-signal model that fully considers the dynamic of the inner loops and the VSG-based outer power control loop. Participation analysis is used to point out the contributions of different states to the eigenvalues. Moreover, eigenvalue locus and singular value decomposition (SVD) are applied together to evaluate the impact of the inner loop parameters on the harmonic resonance characteristics around the LCL filter resonance frequency. The analysis indicates that the harmonic resonance instability is mainly caused by decreasing the proportional gains of the current loop and the voltage loop. Finally, extensive numerical simulation and experimental results are given to verify the validity of the theoretical analysis. Both the simulation and experimental results indicate that the voltage of the common coupling point is unstable after decreasing the proportional gains of the current and voltage controllers. As K pc decreases from 5 to 0.4 or K pv decreases from 0.6 to 0.2, the harmonic distortion factor (HDF) around the LCL filter resonance frequency increases. Furthermore, the consistency of simulation results, experimental results, and the theoretical analysis results is validated.
Jingya Jiang; Wei Wang; Xuezhi Wu; Fen Tang; Zhengwen Yang; Xiangjun Li. Analysis of Harmonic Resonance Characteristics in Grid-Connected LCL Virtual Synchronous Generator. Sustainability 2021, 13, 4261 .
AMA StyleJingya Jiang, Wei Wang, Xuezhi Wu, Fen Tang, Zhengwen Yang, Xiangjun Li. Analysis of Harmonic Resonance Characteristics in Grid-Connected LCL Virtual Synchronous Generator. Sustainability. 2021; 13 (8):4261.
Chicago/Turabian StyleJingya Jiang; Wei Wang; Xuezhi Wu; Fen Tang; Zhengwen Yang; Xiangjun Li. 2021. "Analysis of Harmonic Resonance Characteristics in Grid-Connected LCL Virtual Synchronous Generator." Sustainability 13, no. 8: 4261.
This paper proposes a coordinated voltage regulation method for active distribution networks (ADNs) to mitigate nodal voltage fluctuations caused by photovoltaic (PV) power fluctuations, where a three-stage optimization scheme is developed to coordinate and optimize the tap position of on-load tap changers (OLTCs), the reactive power of capacitor banks (CBs), and the active and reactive power of soft open points (SOPs). The first stage aims to schedule the OLTC and CBs hourly using the rolling optimization algorithm. In the second stage, a multi-objective optimization model of SOPs is established to periodically (15 min) optimize the active and reactive power of each SOP. Meanwhile, this model is also responsible for optimizing the Q-V droop control parameters of each SOP used in the third stage. The aim of the third stage is to suppress real-time (1 min) voltage fluctuations caused by rapid changes in PV power, where the Q-V droop control is developed to regulate the actual reactive power of SOPs automatically, according to the measured voltage at the SOPs’ connection points. Furthermore, numerous simulations and comparisons are carried out on a modified IEEE 33-bus distribution network to verify the effectiveness and correctness of the proposed voltage regulation method.
Ruonan Hu; Wei Wang; Zhe Chen; Xuezhi Wu; Long Jing; Wei Ma; Guohong Zeng. Coordinated Voltage Regulation Methods in Active Distribution Networks with Soft Open Points. Sustainability 2020, 12, 9453 .
AMA StyleRuonan Hu, Wei Wang, Zhe Chen, Xuezhi Wu, Long Jing, Wei Ma, Guohong Zeng. Coordinated Voltage Regulation Methods in Active Distribution Networks with Soft Open Points. Sustainability. 2020; 12 (22):9453.
Chicago/Turabian StyleRuonan Hu; Wei Wang; Zhe Chen; Xuezhi Wu; Long Jing; Wei Ma; Guohong Zeng. 2020. "Coordinated Voltage Regulation Methods in Active Distribution Networks with Soft Open Points." Sustainability 12, no. 22: 9453.
To solve the economic dispatch (ED) problem of multiple distributed generations in the microgrid, this paper proposes a fully distributed method by using the exact diffusion strategy which can achieve exact convergence under sparse communication network. Firstly, a multi-agent hierarchical control architecture for the microgrid is designed. The microgrid central controller (MGCC) agent does not act as centralized control but instead participates in the distributed optimization between the bottom layer agents. Furthermore, an economic dispatch optimization model is established which aims at minimizing the operation cost, optimizing the active power of all dispatchable agents including distributed generators and flexible loads on demand side, and realizing the economic utilization of resources. A modified diffusion algorithm supporting full distributed optimization is proposed to solve it, which does not depend on the “leader unit” and is applicable to the actual problem. The modified algorithm has faster convergence speed, higher stability and stronger expansibility than consensus algorithm. Six scenarios are adopted to verify the proposed method. The result shows that the agent framework and the algorithm can cope with changing of communication topology and realize the “plug and play”. The output will converge to the optimal dispatch solution even if communication fails.
Yongjing He; Wei Wang; Xuezhi Wu. Multi-Agent Based Fully Distributed Economic Dispatch in Microgrid Using Exact Diffusion Strategy. IEEE Access 2019, 8, 7020 -7031.
AMA StyleYongjing He, Wei Wang, Xuezhi Wu. Multi-Agent Based Fully Distributed Economic Dispatch in Microgrid Using Exact Diffusion Strategy. IEEE Access. 2019; 8 (99):7020-7031.
Chicago/Turabian StyleYongjing He; Wei Wang; Xuezhi Wu. 2019. "Multi-Agent Based Fully Distributed Economic Dispatch in Microgrid Using Exact Diffusion Strategy." IEEE Access 8, no. 99: 7020-7031.
The power fluctuations of grid-connected photovoltaic (PV) systems have negative impacts on the power quality and stability of the utility grid. In this study, the combinations of a battery/supercapacitor hybrid energy storage system (HESS) and the PV power curtailment are used to smooth PV power fluctuations. A PV power curtailment algorithm is developed to limit PV power when power fluctuation exceeds the power capacity of the HESS. A multi-objective optimization model is established to dispatch the HESS power, considering energy losses and the state of charge (SOC) of the supercapacitor. To prevent the SOCs of the HESS from approaching their lower limits, a SOC correction strategy is proposed to correct the SOCs of the HESS. Moreover, this paper also investigates the performances (such as the smoothing effects, losses and lifetime of energy storage, and system net profits) of two different smoothing strategies, including the method of using the HESS and the proposed strategy. Finally, numerous simulations are carried out based on data obtained from a 750 kWp PV plant. Simulation results indicate that the proposed method is more economical and can effectively smooth power fluctuations compared with the method of using the HESS.
Wei Ma; Wei Wang; Xuezhi Wu; Ruonan Hu; Fen Tang; Weige Zhang. Control Strategy of a Hybrid Energy Storage System to Smooth Photovoltaic Power Fluctuations Considering Photovoltaic Output Power Curtailment. Sustainability 2019, 11, 1324 .
AMA StyleWei Ma, Wei Wang, Xuezhi Wu, Ruonan Hu, Fen Tang, Weige Zhang. Control Strategy of a Hybrid Energy Storage System to Smooth Photovoltaic Power Fluctuations Considering Photovoltaic Output Power Curtailment. Sustainability. 2019; 11 (5):1324.
Chicago/Turabian StyleWei Ma; Wei Wang; Xuezhi Wu; Ruonan Hu; Fen Tang; Weige Zhang. 2019. "Control Strategy of a Hybrid Energy Storage System to Smooth Photovoltaic Power Fluctuations Considering Photovoltaic Output Power Curtailment." Sustainability 11, no. 5: 1324.
A single-objective optimization energy management strategy (EMS) for an onboard hybrid energy storage system (HESS) for light rail (LR) vehicles is proposed. The HESS uses batteries and supercapacitors (SCs). The main objective of the proposed optimization is to reduce the battery and SC losses while maintaining the SC state of charge (SOC) within specific limits based on the distance between consecutive LR stations. To do this, a series of optimized SOC limits is used to prevent the SC from becoming exhausted prematurely instead of the standard SC SOC penalty term in the cost function. Meanwhile, a rule-based EMS (RB-EMS) is used to give the SCs charging priority over the batteries when the vehicle is braking. Moreover, a simplified method for the optimization is proposed to reduce the computational burden. Simulation and experimental results for the proposed EMS and a standard SC SOC penalty-based cost function optimization are provided to evaluate losses. As a result, it is shown that the proposed EMS, compared with standard SC SOC penalty-based cost function optimization, decreases losses and prevents the SOC from reach the discharging limits.
Long Cheng; Wei Wang; Shaoyuan Wei; Hongtao Lin; Zhidong Jia. An Improved Energy Management Strategy for Hybrid Energy Storage System in Light Rail Vehicles. Energies 2018, 11, 423 .
AMA StyleLong Cheng, Wei Wang, Shaoyuan Wei, Hongtao Lin, Zhidong Jia. An Improved Energy Management Strategy for Hybrid Energy Storage System in Light Rail Vehicles. Energies. 2018; 11 (2):423.
Chicago/Turabian StyleLong Cheng; Wei Wang; Shaoyuan Wei; Hongtao Lin; Zhidong Jia. 2018. "An Improved Energy Management Strategy for Hybrid Energy Storage System in Light Rail Vehicles." Energies 11, no. 2: 423.
This paper introduces the concept of Fast-Swap Charging (FSC), an operation mode designed to improve the efficiency in on-board-powered light rail (LR) networks. The main concept is to swap the depleted energy storage units for fresh, pre-charged units after the light rail vehicle arrives at its terminus. Instead of charging them during daily operation. The proposed operation mode allows the empty energy storage components to be charged at night, so that a cheaper kWh tariff is accessed. Energy efficiency models capable of assessing the energy efficiency are developed as a framework for practical case studies. Finally, a case study illustrating the effects of different operation modes on the selection and optimal sizing of energy storage components, and the energy efficiency of the Zhuhai route, China are included. The results show that the proposed Fast-Swap Charging outperform the counterparts in terms of efficiency and average cost per operating cycle.
Long Cheng; Pablo Acuna; Shaoyuan Wei; John Fletcher; Wei Wang; Jiuchun Jiang. Fast-Swap Charging: An Improved Operation Mode For Catenary-Free Light Rail Networks. IEEE Transactions on Vehicular Technology 2017, 67, 2912 -2920.
AMA StyleLong Cheng, Pablo Acuna, Shaoyuan Wei, John Fletcher, Wei Wang, Jiuchun Jiang. Fast-Swap Charging: An Improved Operation Mode For Catenary-Free Light Rail Networks. IEEE Transactions on Vehicular Technology. 2017; 67 (4):2912-2920.
Chicago/Turabian StyleLong Cheng; Pablo Acuna; Shaoyuan Wei; John Fletcher; Wei Wang; Jiuchun Jiang. 2017. "Fast-Swap Charging: An Improved Operation Mode For Catenary-Free Light Rail Networks." IEEE Transactions on Vehicular Technology 67, no. 4: 2912-2920.
Due to the widespread deployment of distributed energy resources (DERs) and the liberalization of electricity market, traditional distribution networks are undergoing a transition to active distribution systems (ADSs), and the traditional deterministic planning methods have become unsuitable under the high penetration of DERs. Aiming to develop appropriate models and methodologies for the planning of ADSs, the key features of ADS planning problem are analyzed from the different perspectives, such as the allocation of DGs and ESS, coupling of operation and planning, and high-level uncertainties. Based on these analyses, this comprehensive literature review summarizes the latest research and development associated with ADS planning. The planning models and methods proposed in these research works are analyzed and categorized from different perspectives including objectives, decision variables, constraint conditions, and solving algorithms. The key theoretical issues and challenges of ADS planning are extracted and discussed. Meanwhile, emphasis is also given to the suitable suggestions to deal with these abovementioned issues based on the available literature and comparisons between them. Finally, several important research prospects are recommended for further research in ADS planning field, such as planning with multiple micro-grids (MGs), collaborative planning between ADSs and information communication system (ICS), and planning from different perspectives of multi-stakeholders.
Rui Li; Wei Wang; Zhe Chen; Jiuchun Jiang; Weige Zhang. A Review of Optimal Planning Active Distribution System: Models, Methods, and Future Researches. Energies 2017, 10, 1715 .
AMA StyleRui Li, Wei Wang, Zhe Chen, Jiuchun Jiang, Weige Zhang. A Review of Optimal Planning Active Distribution System: Models, Methods, and Future Researches. Energies. 2017; 10 (11):1715.
Chicago/Turabian StyleRui Li; Wei Wang; Zhe Chen; Jiuchun Jiang; Weige Zhang. 2017. "A Review of Optimal Planning Active Distribution System: Models, Methods, and Future Researches." Energies 10, no. 11: 1715.
With the permeability of the renewable energy generations (REGs) becoming greater, the distribution network (DN) has become a complex interconnected network with distributed generations (DGs) and loads from a traditional radiate one. REGs bring the great opportunity to low-carbon and sustainable development of the distribution system (DS), but it also brings severe impacts to the security and stability of the operation. In this chapter, six key impacts regarding secure operation are analyzed including power transmission, power quality, frequency stability, islanding effects, protection, and power-system planning. Based on the analyses, corresponding suggestions are introduced. Particularly, the promotion of REGs’ stability and controllability, as well as the coordinated planning method for DN considering the integration of REGs, are discussed in detail.
Rui Li; Wei Wang; Lijie Xu. Security Impacts and Key Issues of Integration of REGs on Distribution System. Proceedings of 2015 2nd International Conference on Industrial Economics System and Industrial Security Engineering 2015, 91 -97.
AMA StyleRui Li, Wei Wang, Lijie Xu. Security Impacts and Key Issues of Integration of REGs on Distribution System. Proceedings of 2015 2nd International Conference on Industrial Economics System and Industrial Security Engineering. 2015; ():91-97.
Chicago/Turabian StyleRui Li; Wei Wang; Lijie Xu. 2015. "Security Impacts and Key Issues of Integration of REGs on Distribution System." Proceedings of 2015 2nd International Conference on Industrial Economics System and Industrial Security Engineering , no. : 91-97.
Optimal power flow (OPF) objective functions involve minimization of the total fuel costs of generating units, minimization of atmospheric pollutant emissions, minimization of active power losses and minimization of voltage deviations. In this paper, a fuzzy multi-objective OPF model is established by the fuzzy membership functions and the fuzzy satisfaction-maximizing method. The improved artificial bee colony (IABC) algorithm is applied to solve the model. In the IABC algorithm, the mutation and crossover operations of a differential evolution algorithm are utilized to generate new solutions to improve exploitation capacity; tent chaos mapping is utilized to generate initial swarms, reference mutation solutions and the reference dimensions of crossover operations to improve swarm diversity. The proposed method is applied to multi-objective OPF problems in IEEE 30-bus, IEEE 57-bus and IEEE 300-bus test systems. The results are compared with those obtained by other algorithms, which demonstrates the effectiveness and superiority of the IABC algorithm, and how the optimal scheme obtained by the proposed model can make systems more economical and stable.
Xuanhu He; Wei Wang; Jiuchun Jiang; Lijie Xu. An Improved Artificial Bee Colony Algorithm and Its Application to Multi-Objective Optimal Power Flow. Energies 2015, 8, 2412 -2437.
AMA StyleXuanhu He, Wei Wang, Jiuchun Jiang, Lijie Xu. An Improved Artificial Bee Colony Algorithm and Its Application to Multi-Objective Optimal Power Flow. Energies. 2015; 8 (4):2412-2437.
Chicago/Turabian StyleXuanhu He; Wei Wang; Jiuchun Jiang; Lijie Xu. 2015. "An Improved Artificial Bee Colony Algorithm and Its Application to Multi-Objective Optimal Power Flow." Energies 8, no. 4: 2412-2437.
This article has been retracted by the publisher.
Quan-Xin Yang; Wei Wang; Li-Jie Xu; Ping-Hao Ni; Ming-Chao Xia; Lin Wang; Heng-Lin Liu. Notice of Retraction: Research On Wind Power Connected To Power Grid By Fractional Frequency Transmission System. 2010 Asia-Pacific Power and Energy Engineering Conference 2010, 1 -4.
AMA StyleQuan-Xin Yang, Wei Wang, Li-Jie Xu, Ping-Hao Ni, Ming-Chao Xia, Lin Wang, Heng-Lin Liu. Notice of Retraction: Research On Wind Power Connected To Power Grid By Fractional Frequency Transmission System. 2010 Asia-Pacific Power and Energy Engineering Conference. 2010; ():1-4.
Chicago/Turabian StyleQuan-Xin Yang; Wei Wang; Li-Jie Xu; Ping-Hao Ni; Ming-Chao Xia; Lin Wang; Heng-Lin Liu. 2010. "Notice of Retraction: Research On Wind Power Connected To Power Grid By Fractional Frequency Transmission System." 2010 Asia-Pacific Power and Energy Engineering Conference , no. : 1-4.