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With the penetration of renewable energy sources based distributed generation (RES-DG) in the distribution network (DN), the operating time of protection relays becomes a major concern to avoid the mis-coordination and nuisance tripping of RES-DG. It is due to the bidirectional flow of current, variance in the fault current level, i.e. high fault current in case of Squirrel cage induction generator (SCIG) based RES-DG, and low fault current for an inverter-based RES-DGs. This paper proposes a novel User-defined dual setting direction overcurrent relay with hybrid time current-voltage (UDDOR-TCV) characteristics to intensify the proposed scheme’s flexibility without any communication assistance for radial DN. The proposed model is formulated in a constrained non-linear optimization fashion and solved with the MINLP solver of general algebraic modelling system(GAMS) software to determine the optimal relay settings. The propounded protection scheme is simulated on IEEE-33 bus radial distribution system and a local 40-bus system hosting the multiple SCIG and PV based RES-DGs at optimal locations. Detailed numerical studies are carried out to show the performance of the proposed scheme. 66.848% and 68.26% reduction in relay operation time with zero mis-coordination is achieved with SCIG-WTG case and PV-units case for the IEEE-33 bus system and a similar reduction in operation time is 68.937% and 66.563% for Local-40 bus system. Moreover, the relays numbers are reduced by 32.692% and 39.7% for IEEE-33 and Local-40 bus systems, respectively, due to the forward/reverse characteristics capability of the proposed UDDOR-TCV. The performance of the proposed scheme is also evaluated on IEEE-8 bus meshed DN. The results are compared with the existing protection schemes in recent literature.
Lucheng Hong; Mian Rizwan; Muhammad Wasif; Shafiq Ahmad; Mazen Zaindin; Muhammad Firdausi. User-Defined Dual Setting Directional Overcurrent Relays with Hybrid Time Current-Voltage Characteristics-Based Protection Coordination for Active Distribution Network. IEEE Access 2021, 9, 62752 -62769.
AMA StyleLucheng Hong, Mian Rizwan, Muhammad Wasif, Shafiq Ahmad, Mazen Zaindin, Muhammad Firdausi. User-Defined Dual Setting Directional Overcurrent Relays with Hybrid Time Current-Voltage Characteristics-Based Protection Coordination for Active Distribution Network. IEEE Access. 2021; 9 ():62752-62769.
Chicago/Turabian StyleLucheng Hong; Mian Rizwan; Muhammad Wasif; Shafiq Ahmad; Mazen Zaindin; Muhammad Firdausi. 2021. "User-Defined Dual Setting Directional Overcurrent Relays with Hybrid Time Current-Voltage Characteristics-Based Protection Coordination for Active Distribution Network." IEEE Access 9, no. : 62752-62769.
Renewable energy sources powered distributed generation (RES‐DG) is getting more indispensable to encounter the considerable increase in demand for electric energy owing to its techno‐economic benefits and eco‐friendly nature. An economic solution to this demand can only be obtained with the optimal placement and sizing of RES‐DGs. The optimal siting and sizing of RES‐DG, such as Photovoltaic (PV) and Wind Turbine (WT) is still a hot topic due to the uncertainties in solar irradiance (SI) and wind speed (WS). The main objective of this research paper is to develop a RES‐DG siting and sizing strategy for the discrete, nonlinear siting and sizing pattern of RES‐DGs using a novel hybrid Harris' Hawk optimizer (HHHO), considering the stochastic nature of SI and WS. The Weibull and Beta probability density functions (PDFs) are utilized for modeling the stochastic nature of WS and SI, respectively. The optimization of the multiobjective function comprises active power loss reduction, enhancement in voltage profile, and improvement in voltage stability index (VSI). Different scenarios of single and multiple RES‐DGs and capacitor banks (CB) are examined to validate the efficiency of the proposed novel HHHO based RES‐DGs siting and sizing strategy. The results show a considerable reduction in power loss, enhancement in the system voltage profile, and improvement in VSI. Evaluation of results by comparing withstate‐of‐art hybrid algorithms shows that the proposed solution using HHHO algorithm is globally optimum.
Mian Rizwan; Lucheng Hong; Wasif Muhammad; Syed Waqar Azeem; Yankun Li. Hybrid Harris Hawks optimizer for integration of renewable energy sources considering stochastic behavior of energy sources. International Transactions on Electrical Energy Systems 2021, 31, 1 .
AMA StyleMian Rizwan, Lucheng Hong, Wasif Muhammad, Syed Waqar Azeem, Yankun Li. Hybrid Harris Hawks optimizer for integration of renewable energy sources considering stochastic behavior of energy sources. International Transactions on Electrical Energy Systems. 2021; 31 (2):1.
Chicago/Turabian StyleMian Rizwan; Lucheng Hong; Wasif Muhammad; Syed Waqar Azeem; Yankun Li. 2021. "Hybrid Harris Hawks optimizer for integration of renewable energy sources considering stochastic behavior of energy sources." International Transactions on Electrical Energy Systems 31, no. 2: 1.
With the fast development of advanced switches and magnetic cores, high-frequency oscillation (HFO) caused by high dv/dt of fast switching devices and stray capacitances of transformer in dual active bridge (DAB) presents a significantly challenge. In this paper, a comprehensive analysis, design and optimal methodology of HFO for DAB with wideband gap (WBG) switching devices and nanocrystalline transformer cores is proposed. The stray parameters equivalent circuit of DAB is built and the key influencing factors to mitigated the HFO are identified by establishing a time-domain analytical model. Based on the theoretical analysis, this paper points out for the first time that the traditional method of decreasing the stray capacitance of the transformer to eliminate HFO is not suitable for high dv/dt occasions when using WBG switching devices. Correspondingly, a novel elimination method of HFO by equating the voltage changing time of dv/dt to the oscillation cycle is proposed, through which the minimum voltage spike amplitude (VSA) of HFO can be achieved mathematically. A 6.6-kW DAB prototype with three different transformers is developed and an approximately 95% reduction of the VSA can be achieved when the proposed HFO elimination method is adopted, which verifies the effectiveness of the proposed method.
Bin Cui; Hongliang Shi; Qianhao Sun; Xueteng Tang; Lucheng Hong; Biao Zhao. A Novel Analysis, Design, and Optimal Methodology of High-Frequency Oscillation for Dual Active Bridge Converters With WBG Switching Devices and Nanocrystalline Transformer Cores. IEEE Transactions on Power Electronics 2021, 36, 7665 -7678.
AMA StyleBin Cui, Hongliang Shi, Qianhao Sun, Xueteng Tang, Lucheng Hong, Biao Zhao. A Novel Analysis, Design, and Optimal Methodology of High-Frequency Oscillation for Dual Active Bridge Converters With WBG Switching Devices and Nanocrystalline Transformer Cores. IEEE Transactions on Power Electronics. 2021; 36 (7):7665-7678.
Chicago/Turabian StyleBin Cui; Hongliang Shi; Qianhao Sun; Xueteng Tang; Lucheng Hong; Biao Zhao. 2021. "A Novel Analysis, Design, and Optimal Methodology of High-Frequency Oscillation for Dual Active Bridge Converters With WBG Switching Devices and Nanocrystalline Transformer Cores." IEEE Transactions on Power Electronics 36, no. 7: 7665-7678.
Conventional protection schemes in the distribution system are liable to suffer from high penetration of renewable energy source-based distributed generation (RES-DG). The characteristics of RES-DG, such as wind turbine generators (WTGs), are stochastic due to the intermittent behavior of wind dynamics (WD). It can fluctuate the fault current level, which in turn creates the overcurrent relay coordination (ORC) problem. In this paper, the effects of WD such as wind speed and direction on the short-circuit current contribution from a WTG is investigated, and a robust adaptive overcurrent relay coordination scheme is proposed by forecasting the WD. The seasonal autoregression integrated moving average (SARIMA) and artificial neuro-fuzzy inference system (ANFIS) are implemented for forecasting periodic and nonperiodic WD, respectively, and the fault current level is calculated in advance. Furthermore, the ORC problem is optimized using hybrid Harris hawks optimization and linear programming (HHO–LP) to minimize the operating times of relays. The proposed algorithm is tested on the modified IEEE-8 bus system with wind farms, and the overcurrent relay (OCR) miscoordination caused by WD is eliminated. To further prove the effectiveness of the algorithm, it is also tested in a typical wind-farm-integrated substation. Compared to conventional protection schemes, the results of the proposed scheme were found to be promising in fault isolation with a remarkable reduction in the total operation time of relays and zero miscoordination.
Mian Rizwan; Lucheng Hong; Muhammad Waseem; Shafiq Ahmad; Mohamed Sharaf; Muhammad Shafiq. A Robust Adaptive Overcurrent Relay Coordination Scheme for Wind-Farm-Integrated Power Systems Based on Forecasting the Wind Dynamics for Smart Energy Systems. Applied Sciences 2020, 10, 6318 .
AMA StyleMian Rizwan, Lucheng Hong, Muhammad Waseem, Shafiq Ahmad, Mohamed Sharaf, Muhammad Shafiq. A Robust Adaptive Overcurrent Relay Coordination Scheme for Wind-Farm-Integrated Power Systems Based on Forecasting the Wind Dynamics for Smart Energy Systems. Applied Sciences. 2020; 10 (18):6318.
Chicago/Turabian StyleMian Rizwan; Lucheng Hong; Muhammad Waseem; Shafiq Ahmad; Mohamed Sharaf; Muhammad Shafiq. 2020. "A Robust Adaptive Overcurrent Relay Coordination Scheme for Wind-Farm-Integrated Power Systems Based on Forecasting the Wind Dynamics for Smart Energy Systems." Applied Sciences 10, no. 18: 6318.
The distributed generation (DG) is getting extensively integrated in existing power distribution system because of the massive development in green energy technologies and their economical, technical, and environment benefits. However, apart from beneficial aspects, DGs also have various and complex technical limitations, major of which are loss of protection coordination among protection devices which can lead to malfunctioning of protection devices, blind protection, fuse blowing, and permanent outage of power supply due to temporary faults. In this paper, a novel curve fitting technique is designed to restore much influenced recloser‐fuse coordination using the directional properties of midline recloser for upstream and downstream protection devices coordination. It also works on fuse‐saving scheme. Using Electrical Transient Analysis Program (ETAP) Software, the proposed methodology is implemented on a real 11 kV Rajewala radial distribution feeder starting from 132 kV Eimnabad grid station, district Gujranwala, Pakistan. Present here are some key results. Different case studies are carried out and results validate the effectiveness of the proposed methodology, and the coordination among protection devices is sustained even after DGs integration in the system.
Mian Rizwan; Lucheng Hong; Muhammad Waseem; Wantao Shu. Sustainable protection coordination in presence of distributed generation with distributed network. International Transactions on Electrical Energy Systems 2019, 30, 1 .
AMA StyleMian Rizwan, Lucheng Hong, Muhammad Waseem, Wantao Shu. Sustainable protection coordination in presence of distributed generation with distributed network. International Transactions on Electrical Energy Systems. 2019; 30 (3):1.
Chicago/Turabian StyleMian Rizwan; Lucheng Hong; Muhammad Waseem; Wantao Shu. 2019. "Sustainable protection coordination in presence of distributed generation with distributed network." International Transactions on Electrical Energy Systems 30, no. 3: 1.
This paper investigates corporate social responsibility activities within the environmental realm, with particular focus on the case of energy industry. Comparing corporate social responsibility strategies in a differentiated duopoly with substitute products and eco-R&D, it shows that consumer-friendliness are significant, both production and profit will increase when the energy tax is imposed, but consumer surplus will decrease. Furthermore, if the rate of energy tax is not redundant, both prices of Low-energy-consuming products and common product will be reduced, resulting in a more conspicuous cost advantage to the firm adopting eco-R&D.
Angela C. Chao; Lucheng Hong. Corporate Social Responsibility Strategy, Environment and Energy Policy. Structural Change and Economic Dynamics 2018, 51, 311 -317.
AMA StyleAngela C. Chao, Lucheng Hong. Corporate Social Responsibility Strategy, Environment and Energy Policy. Structural Change and Economic Dynamics. 2018; 51 ():311-317.
Chicago/Turabian StyleAngela C. Chao; Lucheng Hong. 2018. "Corporate Social Responsibility Strategy, Environment and Energy Policy." Structural Change and Economic Dynamics 51, no. : 311-317.
China’s economy steps into the “new normal” phase, as it is growing in an innovation-driven instead of a factor-driven mode. In this paper, we constructed the corporate behavioral decision models in different scenarios of policy and analyzed the effect of energy policies on corporate behavior and societal welfare, in a duopoly market. The following conclusions were derived. (1) In a duopoly, the product pricing is irrelevant to the resource cost in their production process. (2) For the firm undertaking the social responsibility, the energy tax imposed by the government would increase either the production or the profit, but decrease the consumer surplus. In contrast, for the other firms, the energy tax rate is opposite to their profit. (3) Low-energy-consuming products will promote efficiency, which reduces either the price or the marginal cost, resulting in a more conspicuous cost advantage to the firm adopting the ecological innovation. (4) The marginal cost for a low-energy-consuming technology research and development steadily decreases, which turns their short-term financial disadvantages into the long-term competitive advantages. The marginal contribution of this paper was to build a simultaneously moving model, in duopoly market, and provide theoretical evidence to endogenize the firm strategy to undertake social responsibilities and to realize sustainable growth.
Lucheng Hong; Angela Chao. Strategic Corporate Social Responsibility, Sustainable Growth, and Energy Policy in China. Energies 2018, 11, 3024 .
AMA StyleLucheng Hong, Angela Chao. Strategic Corporate Social Responsibility, Sustainable Growth, and Energy Policy in China. Energies. 2018; 11 (11):3024.
Chicago/Turabian StyleLucheng Hong; Angela Chao. 2018. "Strategic Corporate Social Responsibility, Sustainable Growth, and Energy Policy in China." Energies 11, no. 11: 3024.
This paper addresses the resonance problem in a parallel-inverter-based grid-connected system. Harmonic interactions between inverters and the grid exhibit various and complicated characteristics that threatens the system stability and power quality. In this paper, a method of harmonic resonance analysis is proposed to investigate the resonance problem in a multi-inverter grid-connected system based on resonance modal analy-sis (RMA) and participation factor (PF) calculations. Firstly, an impedance-based analytical approach is employed and expanded to a power network that is dominated by multiple inverters with LCL filters and proportional resonant controllers. Then, the RMA is introduced to investigate the resonant interactions be-tween inverters and the grid. Specifically, harmonic resonance characteristics are addressed through transfer functions and the proposed method considering variation of inverter number, dif-ferent inverter combinations and critical system components. Finally, time domain simulations on the PSCAD/EMTDC plat-form are presented. The case study results validate the effective-ness of the proposed method.
Lucheng Hong; Wantao Shu; Jianhua Wang; Rizwan Mian. Harmonic Resonance Investigation of a Multi-Inverter Grid-Connected System Using Resonance Modal Analysis. IEEE Transactions on Power Delivery 2018, 34, 63 -72.
AMA StyleLucheng Hong, Wantao Shu, Jianhua Wang, Rizwan Mian. Harmonic Resonance Investigation of a Multi-Inverter Grid-Connected System Using Resonance Modal Analysis. IEEE Transactions on Power Delivery. 2018; 34 (1):63-72.
Chicago/Turabian StyleLucheng Hong; Wantao Shu; Jianhua Wang; Rizwan Mian. 2018. "Harmonic Resonance Investigation of a Multi-Inverter Grid-Connected System Using Resonance Modal Analysis." IEEE Transactions on Power Delivery 34, no. 1: 63-72.
Based on the analysis of the short current of the fixed speed induction generator (FSIG) under symmetrical system faults, a strategy using the dynamic voltage restorer (DVR) is proposed to improve the low-voltage ride through (LVRT) capability of FSIGs. During the system fault, LVRT-DVR is connected in series between the grid and the generator by switching-off the by-pass bidirectional thyristors and provides a compensating voltage to isolate FSIG from the system fault. To increase the switch-in speed of LVRT-DVR, an antivoltage technique is used to shut the thyristors off immediately. After the fault is cleared, the phase-shifting control is applied to avoid phase jumps of the FSIG terminal voltage. The PSCAD/EMTDC simulation and field tests have been carried out to prove the effectiveness of the proposed LVRT strategy, and related conclusions and comments are summarized.
Lucheng Hong; Qirong Jiang; Liang Wang. A dynamic strategy to improve the ride-through capability of a fixed speed induction generator. International Transactions on Electrical Energy Systems 2018, 28, e2538 .
AMA StyleLucheng Hong, Qirong Jiang, Liang Wang. A dynamic strategy to improve the ride-through capability of a fixed speed induction generator. International Transactions on Electrical Energy Systems. 2018; 28 (5):e2538.
Chicago/Turabian StyleLucheng Hong; Qirong Jiang; Liang Wang. 2018. "A dynamic strategy to improve the ride-through capability of a fixed speed induction generator." International Transactions on Electrical Energy Systems 28, no. 5: e2538.
The energy management of office buildings has been a rising concern for owners, researchers, and energy suppliers. The volatility of power load in office buildings threatens energy consumption and risks device security. This paper investigates the load fluctuation patterns in an office building based on user data, using recurrence interval analysis for different thresholds. The recurrence intervals of volatility are fitted by stretched exponential distribution, from which the probability density function is derived. Then, the short-term and long-term memory effect on the fluctuations are learned by conditional probability density function and multifractal detrended fluctuation analysis, respectively. A hazard function is further established to analyze the risk estimation of load volatility and derive the value at risk (VaR). Thus, a functional relationship has been established between average recurrence interval and threshold. The methodology and analysis results addressed in this paper help to understand load fluctuation patterns and aid in the design of energy consumption strategies in office buildings. According to the results of our research, conclusions and management suggestions are provided at the end of this paper.
Lucheng Hong; Wantao Shu; Angela C. Chao. Recurrence Interval Analysis on Electricity Consumption of an Office Building in China. Sustainability 2018, 10, 306 .
AMA StyleLucheng Hong, Wantao Shu, Angela C. Chao. Recurrence Interval Analysis on Electricity Consumption of an Office Building in China. Sustainability. 2018; 10 (2):306.
Chicago/Turabian StyleLucheng Hong; Wantao Shu; Angela C. Chao. 2018. "Recurrence Interval Analysis on Electricity Consumption of an Office Building in China." Sustainability 10, no. 2: 306.