Abstract
The large-scale penetration of renewable energy and deeply integrated multiple energy forms pose a major challenge for the accounting and allocation process of additional adjustment cost in multi-energy system and electricity market. The variable wind power and the operating status of multi-energy systems faced by the electricity market have driven researchers towards the decision of electricity spot market with complicated pricing mechanism. This paper presents a locational marginal price-based partition optimal economic dispatch model of multi-energy system with a high proportion of renewable energy. First, a model of the additional adjustment cost of multi-energy adjustable units to improve the power grid adjustment capacity is studied based on the power balance model of multi-energy conversion and storage. In the second, to improve the effectiveness of the ESM mechanism, an optimal economic dispatch model is established, with the goal of minimizing the additional adjustment cost of multi-energy adjustable units. Moreover, according to the characteristics of the model and the mechanism of locational marginal price-based economic dispatch, a solution method based on lagrangian relaxation is proposed. The incentive compatible locational marginal price is obtained. Finally, a simulation model of multi-energy systems based on IEEE 39-nodes power system and 7-nodes natural gas system is established. And the model is based on operating data of an actual grid with high proportion of renewable energy in Northeast China. The results of the examples show that the proposed method can effectively improve the efficiency and flexibility of multi-energy system. Another advantage of the proposed method is that the capabilities of the complementary multi-energy coordination can be promoted.
Highlights
The real-time transaction mechanism of multi-agent decision effort in multi-energy system (MES) facilitates the clean and efficient development of power grids, and has become a hot issue in the field of power system research (Jiang and Ai, 2017; Peng and Tao, 2018)
A locational marginal price-based partition optimal economic dispatch model of multi-energy system is proposed in the article, which including multi-energy adjustable units, the process of lagrangian relaxation and locational price
(2) An optimal economic dispatch model of multi-energy system based on the additional adjustment costs is proposed
Summary
The real-time transaction mechanism of multi-agent decision effort in multi-energy system (MES) facilitates the clean and efficient development of power grids, and has become a hot issue in the field of power system research (Jiang and Ai, 2017; Peng and Tao, 2018). Considering the problems of energy balance, network loss, and voltage stability in the EM, (Hanif et al, 2019) proposed a new distribution locational marginal price model, which can effectively improve the optimal allocation of flexible resources in the electricity market. A locational marginal price-based partition optimal economic dispatch model of multi-energy system is proposed in the article, which including multi-energy adjustable units, the process of lagrangian relaxation and locational price. (2) An optimal economic dispatch model of multi-energy system based on the additional adjustment costs is proposed. The constraints include the power network constraints, gas network constraints, and multi-energy adjustable equipment constraints This model plays an important role for pricing mechanism of multi-energy systems coordinated dispatch. The structure of multi-energy system is shown, including wind power, photovoltaic, natural gas sources, multienergy adjustable units (MEAUs) and multi-energy loads. The model can determine the output and reserve of MEAUs, and can provide the required price signal for the electricity spot market
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