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Optimal Coordinated Bidding Strategy of Wind and Solar System with Energy Storage in Day-ahead Market

Journal of Modern Power Systems and Clean Energy 2022年第1期10卷 192-203页

作者： Yinping Yang Chao Qin Yuan Zeng chengshan wang School of Electrical and Information Engineering Tianjin UniversityTianjin 300072China

Although wind and solar power is the major reliable renewable energy sources used in power grids,the fluctuation and unpredictability of these renewable energy sources require the use of ancillary services,thereby increasing the integration *** study proposes a wind,solar,and pumped-storage cooperative(WSPC)model that can be applied to large-scale systems connected to dispersed renewable energy *** model provides an optimized coordinated bidding strategy in the day-ahead market,along with a method to facilitate revenue distribution among participating *** model takes advantage of the natural complementary characteristics of wind and solar power while using pumped storage to adjust the total output *** the coordinated bidding strategy,a proportion of the energies is provided as firm power,which can lower the ancillary service ***,a multi-period firm power-providing mode is adopted to reflect the wind-solar output characteristics of each period *** duration of each period is selected as a variable to accommodate seasonal *** ensures that the provision of firm power can maintain a high proportion under varied connected ratios of wind-solar,thereby obtaining higher *** using the revenue distribution method,the short-term influencing factors of the cooperative model are considered to provide the economic characteristics of wind farms and photovoltaic *** this way,revenue distribution can be fairly realized among the participating ***,the effectiveness and economy of the proposed model are validated based on actual data obtained from the power grid in California,USA.

关键词： Wind energy solar energy energy storage energy resources power system economics

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Provenance of the Lower Jurassic pyroclastic sediments in the Zigui Basin:Implication for crustal thickening in the eastern Qinling orogenic belt

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Science China Earth Sciences 2024年第1期67卷 196-207页

作者： Rong CHAI Jianghai YANG Yuansheng DU chengshan wang School of Earth Sciences and Resources China University of Geosciences(Beijing)Beijing 100023China School of Earth Sciences China University of Geosciences(Wuhan)Wuhan 430074China Chinese Academy of Geological Sciences Beijing 100037China

The Late Triassic witnessed significant collisional orogenic events in the Qinling orogenic belt,accompanied by magma underplating and tectonic *** processes potentially resulted in substantial crustal thickening and uplift of the Qinling ***,due to the absence of igneous rock records from this period in the eastern section of the Qinling orogen,the changes in crustal thickness during this orogenic process have not been thoroughly investigated.A series of foreland basins emerged during the Early Mesozoic to the south of the East Qinling orogenic *** basins have preserved clastic sedimentary rocks derived from the uplift and erosion of the orogenic *** sedimentary records serve as crucial records to reconstruct the evolutionary history of the Qinling *** further clarify the collisional orogenic process of the Qinling orogenic belt,this study conducted in situ volcanic lithic fragment geochemistry,detrital zircon U-Pb chronology and trace element composition analysis on the sandstones of the Lower Jurassic Tongzhuyuan Formation in the Zigui *** results suggest that the sandstones,which exhibit a significant abundance of volcanic lithic fragments,has a characteristic detrital zircon age group of 250–200 Ma,indicating a major provenance from the Triassic volcanic *** with regional correlation and paleocurrent analysis,the detrital zircon U-Pb age data show that the source area of volcanic rocks should be in the Qinling orogenic belt to the north of the *** interpretation is further supported by the Triassic granitic rocks exposed in the western part of the orogenic belt,representing the magmatism during the Triassic collisional orogenesis in the Qinling *** on the co-varying relationships between present-day crust thickness with the chemical compositions of granite rocks and zircons,the La/Yb ratio of volcanic lithic fragments in the Tongzhuyuan Formation and the Eu/Eu*ratio of detrital zircon

关键词： Qinling orogenic belt Zigui Basin Late Triassic Detrital zircons Crustal thickening

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Data-driven Based Uncertainty Set Modeling Method for Microgrid Robust Optimization with Correlated Wind Power

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CSEE Journal of Power and Energy Systems 2023年第2期9卷 420-432页

作者： Xinchen Li Yixin Liu Li Guo Xialin Li chengshan wang Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin300072China

Microgrid is considered an important part of the future zero carbon energy ***,the uncertainty caused by renewable energy source brings huge challenges to the scheduling of MG and restricts its ability of carbon emission *** this paper,a novel improved multi-ellipsoidal uncertainty set modeling method is proposed to better depict the uncertainty of wind power and reduce the conservativeness of traditional robust *** information from historical data is utilized to capture the temporal correlation of forecast error of wind power,as well as the conditional correlation of forecast error with forecast value,making the uncertainty set more data-adaptive to variation of forecast results and more accurate for uncertainty description.A two-stage robust optimization model of a grid-connected microgrid is established based on the proposed uncertainty set and solved by column and constraint generation *** results based on actual data illustrate the average unbalanced power of microgrid between day-ahead trading and real-time power exchange with utility grid is dropped by nearly 11.16%compared with a deterministic optimization method,11.86%with traditional box uncertainty set-based robust optimization method,and 2.89%with stochastic optimization method.

关键词： Correlation data driven improved multiellipsoidal uncertainty set microgrid robust optimization

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A Mode-switching Strategy of Droop Control for VSC-MTDC Systems Considering Maximum DC Voltage Regulation Capability

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 903-912页

作者： Yizhen wang Fengliang Qiu Zhongguan wang Yirun Ji Zhengguang Chen chengshan wang Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China Electric Power Research Institute of State Grid JiBei Electric Power Co.Ltd. Beijing 100045China State Grid Corporation of China Beijing 100031China IEEE

To achieve the goal of carbon neutrality,renewable energy integration through a voltage source converter based multi-terminal direct current(VSC-MTDC)system has been identified as a promising *** tackle the significant DC voltage over-limit problem in a VSC-MTDC system during disturbances,this paper proposes a mode-switching strategy of droop control considering maximum DC voltage regulation *** close relationship between node injection powers and node DC voltages in the MTDC system is elaborated,and the most effective regulation approach of local injection power for limiting DC voltage deviation is *** operating point trajectories of different droop control explains that the DC voltage deviation can be minimized by fully utilizing the capacity of ***,the mode-switching strategy with the maximum DC voltage regulation capability is realized by the switching between the voltage droop control and the constant maximum power *** addition,a mode recovery process and a smooth switching method are developed to make converters regain the capability of maintaining DC voltage and reduce power fluctuation during mode switching,***,three cases are investigated to verify the effectiveness of the proposed mode-switching *** with simulation results of the conventional droop control and the DC voltage deviation-dependent droop control,better performance of transient and steady-state DC voltage deviation is achieved through the proposed strategy.

关键词： Droop control maximum DC voltage regulation capability mode-switching VSC-MTDC

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Pore Connectivity of Deep Lacustrine Shale and its Effect on Gas-bearing Characteristics in the Songliao Basin:Implications from Continental Scientific Drilling

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Acta Geologica Sinica(English Edition) 2023年第5期97卷 1503-1522页

作者： HAN Shuangbiao HUANG Jie wang chengshan CUI Jiayi College of Geoscience and Surveying Engineering China University of Mining and TechnologyBeijing 100083China State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesBeijing 100083China

The lacustrine shale of deep Shahezi Formation in the Songliao basin has great gas potential,but its pore evolution,heterogeneity,and connectivity characteristics remain *** this work,total organic carbon analysis,rock pyrolysis,X-ray diffraction field emission scanning electron microscopy,the particle and crack analysis system software,low-temperature nitrogen adsorption experiment,fractal theory,high-pressure mercury injection experiment and nuclear magnetic resonance experiment were used to study the Shahezi shale from Well *** result indicated that the organic pores in Shahezi shale are not developed,and the intergranular and intragranular pores are mainly formed by illitedominated *** the burial depth increases,the pore size and slit-shaped pores formed by clay decrease,and dissolved pores in the feldspar and carbonate minerals and dissolved fractures in the quartz *** pore evolution is affected by clay,compaction,and high-temperature *** on the pore structure characteristics reflected by the pore size distribution and pore structure parameters obtained by multiple experimental methods,the pore development and evolution are divided into three *** stageⅠandⅡ,the pore heterogeneity of the shale reservoirs increases with the depth,the physical properties and pore connectivity deteriorate,but the gas-bearing property is *** stageⅢ,the pore heterogeneity is the highest,its gas generation and storage capacity are low,but the increase of micro-fractures makes pore connectivity and gas-bearing better.

关键词： pore evolution pore connectivity gas-bearing deep shale Songliao basin

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Adaptive Reference Power Based Voltage Droop Control for VSC-MTDC Systems

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Journal of Modern Power Systems and Clean Energy 2023年第1期11卷 381-388页

作者： Yizhen wang Fengliang Qiu Guowei Liu Ming Lei Chao Yang chengshan wang Key Laboratory of Smart Grid of Ministry of Education Key Laboratory of Smart Energy&Information Technology of Tianjin MunicipalityTianjin 300072China Shenzhen Power Supply Bureau Co. Ltd.Shenzhen 518001China Sichuan Energy Internet Research Institution Tsinghua UniversityChengdu 610213China IEEE

Featuring low communication requirements and high reliability,the voltage droop control method is widely adopted in the voltage source converter based multi-terminal direct current(VSC-MTDC)system for autonomous DC voltage regulation and ***,the traditional voltage droop control method with fixed droop gain is criticized for over-limit DC voltage deviation in case of large power disturbances,which can threaten stable operation of the entire VSCMTDC *** tackle this problem,this paper proposes an adaptive reference power based voltage droop control method,which changes the reference power to compensate the power deviation for droop-controlled voltage source converters(VSCs).Besides retaining the merits of the traditional voltage droop control method,both DC voltage deviation reduction and power distribution improvement can be achieved by utilizing local information and a specific control factor in the proposed *** principles and key features of the proposed method are *** analyses on the effects of the control factor on DC voltage deviation and imbalanced power-sharing are discussed,and the selection principle of the control factor is ***,the effectiveness of the proposed method is validated by the simulations on a five-terminal VSC based high-voltage direct current(VSC-HVDC)system.

关键词： DC voltage deviation power-sharing reference power voltage droop control voltage source converter(VSC) multi-terminal direct current(MTDC)

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Analytical Calculation Method of Reliability Sensitivity Indexes for Distribution Systems Based on Fault Incidence Matrix

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Journal of Modern Power Systems and Clean Energy 2020年第2期8卷 325-333页

作者： Tianyu Zhang chengshan wang Fengzhang Luo Peng Li Liangzhong Yao the Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China State Grid Tianjin Electric Power Company Economic and Technological Research Institute Tianjin 300171China China Electric Power Research Institute Beijing 100192China

An analytical calculation method for the reliability sensitivity indexes of distribution systems is proposed to explicitly quantify the impact of various influence factors on system ***,the analytical calculation formulas for the reliability indexes of distribution systems are derived based on the fault incidence matrix(FIM).Secondly,the factors that affect system reliability are divided into two categories:quantifiable parameter factors and non-quantifiable network structure *** sensitivity indexes for the quantifiable parameter factors are derived using the direct partial derivation of the reliability calculation *** sensitivity indexes for the nonquantifiable network structure factors are derived using the transformation of ***,the accuracy and efficiency of the proposed sensitivity calculation method are verified by applying them to an IEEE 6-bus RBTS *** paper sums up the factors that influence system reliability in detail and gives the explicit analytical calculation method for the sensitivity of each *** calculation of the reliability index can be avoided during the sensitivity *** bottleneck that affects the reliability level of distribution systems can be identified efficiently,and valuable information and guidance can be provided to enhance the reliability of distribution systems.

关键词： Distribution system reliability fault incidence matrix reliability sensitivity analytical calculation

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A seamless operation mode transition control strategy for a microgrid based on master-slave control

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Science China(Technological Sciences) 2012年第6期55卷 1644-1654页

作者： wang chengshan LI XiaLin GUO Li LI YunWei Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China Department of Electrical and Computer Engineering University of AlbertaEdmonton AB T6R 1N6Canada

This paper proposes a control strategy that can realize seamless microgrid operation mode transition between grid-connected operation and stand-alone *** scenario of a microgrid based on master-slave control is considered,where the master distributed generation(DG) unit operates in different control schemes in different microgrid operation modes,while other slave DG units operate with power/current control all the *** proposed control strategy focuses on the master DG unit,and contains the control state/reference compensation algorithm and separation switch control *** proposed method can effectively reduce the impact on the critical loads and DG units caused by microgrid operation mode transitions.

关键词： microgrid distributed generation (DG) master-slave control grid-connected operation stand-alone operation seam-less transition

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Nd isotopic compositions of the Tethyan Himalayan Sequence in southeastern Tibet

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Science China Earth Sciences 2008年第9期51卷 1306-1316页

作者： DAI JinGen YIN An LIU WenCan wang chengshan State Key Laboratory of Geological Processes and Mineral Resources Research Center for Tibetan Plateau Geology and School of GeosciencesChina University of GeosciencesBeijing 100083China Department of Earth and Space Sciences and Institute of Geophysics and Planetary Physics University of CaliforniaLos AngelesCA 90095-1567USA

The Himalayan orogen consists of three major lithologic units that are separated by two major north-dipping faults: the Lesser Himalayan Sequence (LHS) below the Main Central Thrust (MCT), the Greater Himalayan Crystalline Complex (GHC) above the MCT, and the Tethyan Himalayan Sequence (THS) juxtaposed by the South Tibet Detachment fault (STD) over the GHC. Due to widespread meta-morphism and intense deformation, differentiating the above three lithologic units is often difficult. This problem has been overcome by the use of Sm-Nd isotopic analysis. The previous studies suggested that the LHS can be clearly distinguished from the GHC and THS by their Nd isotope compositions. However, the lack of detailed and systematic Sm-Nd isotopic studies of the THS across the Himalaya in general has made differentiation of this unit from the nearby GHC impossible, as the two appear to share overlapping Nd compositions and model ages. To address this problem, we systematically sam-pled and analyzed Nd isotopes of the THS in southeastern Tibet directly north of Bhutan. Our study identifies two distinctive fields in a εNd -TDM plot. The first is defined by the εNd(210 Ma) values of -3.45 to -7.34 and TDM values of 1.15 to 1.29 Ga from a Late Triassic turbidite sequence, which are broadly similar to those obtained from the Lhasa block. The second field is derived from the Early Cretaceous meta-sedimentary rocks with εNd(130 Ma) values from -15.24 to -16.61 and TDM values from 1.63 to 2.00 Ga; these values are similar to those obtained from the Greater Himalayan Crystalline Complex in Bhutan directly south of our sampling traverse, which has εNd(130 Ma) values of -10.89 to -16.32 and Nd model ages (TDM) of 1.73 to 2.20 Ga. From the above observations, we suggest that the Late Triassic strata of the southeast Tibetan THS were derived from the Lhasa block in the north, while the Early Cretaceous strata of the THS were derived from a source similar to the High Himalayan Crystalline Comp

关键词： Himalayan orogen Sm-Nd isotopic systematics Greater Himalayan Crystalline Complex Tethyan Himalaya Sequence Lhasa ter- rane Indian craton

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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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