Font Size: a A A

Multi-energy Cooperation Optimization On Supply- And Demand- Sides In The Energy Interconnection System Based On Distributed Energy Resources Value Analysis

Posted on:2020-01-13Degree:MasterType:Thesis
Country:ChinaCandidate:N TangFull Text:PDF
GTID:2392330623960105Subject:Electrical engineering
Abstract/Summary:PDF Full Text Request
With the rapid development of Energy Internet and Integrated Energy System,the interdependency between the power system and the gas system has been increasingly enhanced through gas turbines(GTs).However,the load priority of GTs in the gas system is relatively low,leading to the interruption without notice when the inelastic gas load level is high.Therefore,the power flow changes accordingly,which may influence the effectiveness of the power system.To solve the above-mentioned operating problem,distributed energy resources(DERs)are encouraged to participate in the economic dispatch in the form of a bid curve submitted by the distribution system operator(DSO).The following work is done in this paper:(1)Based on the DC optimal power flow(DCOPF)considering system losses,an electricity locational marginal price(ELMP)formulation,including marginal energy price,marginal loss price and marginal congestion price,is proposed.Based on the linearization of gas pipes and compressors,a steady-state gas optimal flow model is proposed.Then a gas locational marginal price(GLMP)formuation is proposed based on the Lagrangian Multiplier Method.A joint economic dispatch model of the electricity-gas system is built to derive the price signal which can reflect the system operating state.A specific scenario is proposed to analyze the linkage effect of the electricity-gas system: the increase of local gas demand leads to the bounding of the gas delay constraint,yielding a high GLMP;meanwhile,the gas demand of GTs is curtailed,yielding a high ELMP.(2)Based on the linearization of distributed power flow and the loss factor for distributed power system,the linearized optimal power flow for the distributed system is proposed.As the pressure is relatively low and the pipe is relatively short in the distributed gas system,the linearized optimal gas flow for the distributed system based on the modification of the steadystate maingrid gas flow is proposed.A gas-electricity energy transcation framework considering multi-energy DERs(power to gas,micro gas turbines)and single-energy DERs(interrubptible power load,gas storage tanks)for the DSOs is built to form a stepwise bid curve by simulating different conpensation price offered by the interdependent system operator(ISO).The load adjustment of the single-energy distributed system is only related to the compensation price offered by the ISO itself;the load adjustment of the multi-energy distributed system is both related to the compensaton price offered by the gas and electricity ISO.(3)A bilateral bid dispatch model and framework of the gas-electricity system is proposed,which allows DSOs submit a bid curve according to the locational marginal price of the first dispatch and the DERs under its jurisdiction.After collecting the bid curves,the new price signal is formed through the second economic dispatch.It is verified that DERs can mitigate the delay in the gas system and the congestion in the electricity system.DERs create economic value at both generation and demand sides.In addition,the flexibility of multi-energy DERs is relatively high,making it a better performance.
Keywords/Search Tags:Electricity-gas system, Locational marginal price, Distributed energy resources, Linearization, Bilateral bid
PDF Full Text Request
Related items