Analysis on Equilibrium of the Main and Auxiliary Joint Markets Considering the Aggregators of Electric Vehicles

doi:10.12204/j.issn.1000-7229.2021.02.007

Abstract

Abstract:

The electric vehicle (EV) group can charge and discharge orderly under the control of the electric vehicle aggregator and use the remaining capacity to participate in the auxiliary service market. Firstly, the trading framework of electric energy market and frequency-regulation market under the participation of EV aggregators is established, and the market mode of EV aggregators and the cost of each market subject are analyzed. Then, according to the game equilibrium theory of oligarch competition, a multi-period equilibrium model of energy and frequency-regulation market is established. Finally, the nonlinear complementary method is applied to solve the equilibrium model. The example analysis verifies the rationality and effectiveness of the model, and shows that the electric vehicle aggregator has the effect of ‘peak load cutting and valley filling’ on the load and active-power price after participating in the main and auxiliary market competition; the up and down frequency-regulation capacity price of the system has been reduced, and the reduced of down frequency-regulation capacity price is more obvious; the purchase cost of the system’s frequency-regulation service has been reduced, and the user’s profit and social welfare will be increased throughout the day. It can provide reference for the future market planning and the operation of electric vehicle aggregator.

Key words: electric vehicle aggregator, spot market, frequency-regulation auxiliary market, equilibrium analysis

CLC Number:

TM73

WEI Zhenbo, TIAN Ke, LUO Xiaojun, FANG Tao. Analysis on Equilibrium of the Main and Auxiliary Joint Markets Considering the Aggregators of Electric Vehicles[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(2): 50-57.

Figures/Tables 12

Fig.1 Market framework with the participation of EV aggregators

Fig.2 Flow chart of equilibrium model solution

Table 1 Parameters of the generators

Table 2 Demand function parameter at each time period

Fig.3 Equilibrium price of electric energy market in different situations

Fig.4 Equilibrium price of frequency-regulation market in different situations

Fig.5 Equilibrium output of generators and EVA

Fig.6 Up frequency-regulation capacity of generators and EVA

Fig.7 Down frequency-regulation capacity of generators and EVA

Table 3 Market participants'profits and social welfares

Fig.8 Change of EVA arbitrage charging capacity and frequency-regulation bid winning capacity with battery aging cost

Fig.9 Change of social welfare with the capacity of EV group

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