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locational Marginal Pricing Mechanism for Uncertainty Management Based on Improved Multi-ellipsoidal Uncertainty Set

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Journal of Modern Power Systems and Clean Energy 2021年第4期9卷 734-750页

作者： Zongzheng Zhao Yixin Liu Li Guo Linquan Bai Chengshan Wang Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China Department of Systems Engineering and Engineering Man agement university of North Carolina at CharlotteCharlotteNC 28223USA

The large-scale integration of renewable energy sources (RESs) brings huge challenges to the power system. A cost-effective reserve deployment and uncertainty pricing mechanism are critical to deal with the uncertainty and variability of RES. To this end, this paper proposes a novel locational marginal pricing mechanism in day-ahead market for managing uncertainties from RES. Firstly, an improved multi-ellipsoidal uncertainty set (IMEUS) considering the temporal correlation and conditional correlation of wind power forecasting is formulated to better capture the uncertainty of wind power. The dimension of each ellipsoidal subset is optimized based on a comprehensive evaluation index to reduce the invalid region without large loss of modeling accuracy, so as to reduce the conservatism. Then, an IMEUS-based robust unit commitment (RUC) model and a robust economic dispatch (RED) model are established for the day-ahead market clearing. Both the reserve cost and ramping constraints are considered in the overall dispatch process. Furthermore, based on the Langrangian function of the RED model, a new locational marginal pricing mechanism is developed. The uncertainty locational marginal price (ULMP) is introduced to charge the RES for its uncertainties and reward the generators who provide reserve to mitigate uncertainties. The new pricing mechanism can provide effective price signals to incentivize the uncertainty management in the day-ahead market. Finally, the effectiveness of the proposed mechanism is verified via numerous simulations on the PJM 5-bus system and IEEE 118-bus system.

关键词： Day-ahead market ellipsoidal uncertainty set locational marginal pricing reserve robust unit commitment

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locational marginal price share: a new structural market power index

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Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1709-1720页

作者： Mohammad Ebrahim HAJIABADI Mahdi SAMADI Department of Electrical and Computer Engineering Hakim Sabzevari UniversitySabzevarIran

Market power is known as the ability of units and generation companies(GenCos)to change electricity price *** cleared in the definition,locational marginal price(LMP)is the most important key in market power ***,the main objective of the paper is to analyze market power of units and GenCos based on their abilities to change electricity *** the first step,using Karush-Kuhn-Tucker(KKT)conditions of Lagrangian method,LMP is decomposed into four main *** components indicate the share of each unit at the LMP of each *** values are calculated by the proposed analytical method,and cannot be obtained using simulation *** the second step,"unit-based LMP share(LMP_S)"index,which indicates the contribution factor of each unit at LMP of each bus,is proposed as a new structural market power *** index is also used as an effective tool to determine the most profitable coalition between two *** that,the market operator can predict highly potential ***,"GenCosbased LMP_S"index is *** this effective tool,the contribution of each GenCo,which owns multiple units at various buses,at the LMP of each bus is *** proposed market power indices are calculated on the IEEE24-bus test system and compared with some conventional structural market power *** profits of units due to change of unit’s strategies verify the accuracy of the proposed method.

关键词： Lagrange relaxation method locational marginal price(LMP)share Market power Coalition

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HEMS-enabled transactive flexibility in real-time operation of three-phase unbalanced distribution systems

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Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1434-1449页

作者： Mohammad Nazif FAQIRY Li WANG Hongyu WU Department of Electrical and Computer Engineering Kansas State UniversityManhattanKSUSA

This paper proposes a coordinated two-stage real-time market mechanism in an unbalanced distribution system which can utilize flexibility service from home energy management system(HEMS)to alleviate line congestion,voltage violation,and substation-level power *** the grid level,the distribution system operator(DSO)computes the distribution locational marginal prices(DLMPs)and its energy,loss,congestion,and voltage violation components through comprehensive sensitivity *** using the DLMP components in a firststage optimization problem,the DSO generates two price signals and sends them to HEMS to seek flexibility *** response to the request of DSO,each home-level HEMS computes a flexibility range by incorporating the prices of DSO in its own optimization *** to future uncertainties,the HEMS optimization problem is modeled as an adaptive dynamic programming(ADP)to minimize the total expected cost and discomfort of the household over a forward-looking *** flexibility range of each HEMS is then used by the DSO in a second-stage optimization problem to determine new optimal dispatch points which ensure the efficient,reliable,and congestionfree operation of the distribution ***,the second-stage dispatch points are used by each HEMS to constrain its maximum consumption level in a final ADP to assign consumption level of major appliances such as energy storage,heating,ventilation and air-conditioning,and water *** proposed method is validated on an IEEE 69-bus system with a large number of regular and HEMS-equipped homes in each phase.

关键词： Distribution locational marginal price Real-time market Congestion Home energy management system Unbalanced distribution system Energy storage Adaptive dynamic programming

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东北亚地区矿产资源及其生产要素区位平衡的分析

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人文地理 1995年第4期10卷 56-60页

作者：孙丽华东北师范大学地理系

东北亚地区矿产资源及其生产要素区位平衡的分析孙丽华（东北师范大学地理系）１东北亚矿产资源的赋存作为亚太地区组成部分的东北亚地区，主要包括中国东北、俄罗斯远东地区、朝鲜、韩国、日本和蒙古。这六个国家（地区）相互毗邻，联... 详细信息

东北亚地区矿产资源及其生产要素区位平衡的分析孙丽华（东北师范大学地理系）１东北亚矿产资源的赋存作为亚太地区组成部分的东北亚地区，主要包括中国东北、俄罗斯远东地区、朝鲜、韩国、日本和蒙古。这六个国家（地区）相互毗邻，联系密切，而且交通方便，运输距离短。...

关键词： Northeast Asia Mineral resouces Production elements locational Balance

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THE OFFSHORE DIRECT INVESTMENT OF HONG KONG CLOTHING FIRMS

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Journal of China Textile University(English Edition) 1997年第3期14卷 89-94页

作者：区健勋杨国荣

Hong Kong clothing firms have invested overseas from as early as the late 1950s in order to evade or minimise the impact of quantitative restrictions for export to developed countries. Under global trading and production involvement, the Offshore Direct Investment (ODI) activities of Hong Kong clothing firms have actually spread and penetrated into the clothing industry of different continents in the world. This paper studies empirically on Dunning’s eclectic model for the offshore investment of Hong Kong clothing firms with emphasis on the rationale behind the shift and the locations chosen for initial and recent investments.

关键词： ownership locational internalization initial investment recent investment

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