Mostrando recursos 1 - 4 de 4

  1. The missing money problem: Incorporation of increased resources from wind in a representative US power market

    McElroy, Michael B.; Chen, Xinyu; Deng, Yawen
    The paper considers opportunities to reduce emissions of CO2 through increases in commitments to wind in a representative US power market. A model is applied to simulate market operations for different wind levels focusing on implications of the reduction in clearing prices arising due to increasing inputs of zero marginal cost power from wind, a dilemma referred to as the missing money problem. The resulting decrease in income poses problems for existing thermal and nuclear generating systems, at the same time making investments in wind uneconomic in the absence offsetting policy interventions. Two options are considered to subsidize cost: an...
    - 23-jun-2018

  2. Power System Capacity Expansion under Higher Penetration of Renewables Considering Flexibility Constraints and Low Carbon Policies

    Chen, Xinyu; Lv, Jiajun; McElroy, Michael B.; Han, Xingning; Nielsen, Chris; Wen, Jinyu
    Deploying high penetration of variable renewables represents a critical pathway for deep decarbonizing the power sector. The conflict between their temporal variability and limited system flexibility has been largely ignored currently at planning stage. Here we present a novel capacity expansion model optimizing investment decisions and full-year, hourly power balances simultaneously, with considerations of storage technologies and policy constraints, such as carbon tax and renewable portfolio standards (RPS). Based on a computational efficient modeling formulation, all flexibility constrains (ramping, reserve, minimum output, minimal online/offline time) for the 8760-hour duration are incorporated. The proposed model is applied to the northwestern grid...
    - 23-jun-2018

  3. Impacts of fleet types and charging modes for electric vehicles on emissions under different penetrations of wind power

    Chen, Xinyu; Zhang, Hongcai; Xu, Zhiwei; Nielsen, Chris; McElroy, Michael Brendon; Lv, Jiajun
    Current Chinese policy promotes the development of both electricity-propelled vehicles and carbon-free sources of power. Concern has been expressed that electric vehicles on average may emit more CO2 and conventional pollutants in China. Here, we explore the environmental implications of investments in different types of electric vehicle (public buses, taxis and private light-duty vehicles) and different modes (fast or slow) for charging under a range of different wind penetration levels. To do this, we take Beijing in 2020 as a case study and employ hourly simulation of vehicle charging behaviour and power system operation. Assuming the slow-charging option, we find...
    - 11-may-2018

  4. Integrated Energy Systems for Higher Wind Penetration in China: Formulation, Implementation and Impacts

    Chen, Xinyu; McElroy, Michael Brendon; Kang, Chongqing
    With the largest installed capacity in the world, wind power in China is experiencing a ∼20% curtailment. The inflexible combined heat and power (CHP) has been recognized as the major barrier for integrating the wind source. The approach to reconcile the conflict between inflexible CHP units and variable wind power in Chinese energy system is yet un-clear. This paper explores the technical and economic feasibility of deploying the heat storage tanks and electric boilers under typical power grids and practical operational regulations. A mixed integer linear optimization model is proposed to simulate an integrated power and heating energy systems, including...
    - 15-dic-2017

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