Abstract
As a typical form of integrated energy system, micro energy system (MES) is promoted and popularized at the terminal of distribution grid. To achieve the efficient and reliable energy utilization of MES, two main problems need to be solved: how to consider the dynamic characteristics of heterogeneous energy resources and diverse MES operating states under multiple time scales and how to coordinate the interests of both MES operator and distribution grid operator. This paper aims to establish the models of specific energy devices in MES and propose a coordinated control strategy for multi MESs within distribution grid considering dynamic characteristics and contradictory interests. The proposed strategy is presented from the MES side and distribution grid side with consideration of different control objectives under day-ahead dispatch, intra-day dispatch and emergency control circumstances. A case study based on IEEE 33-bus system with MESs connected is conducted to verify the effectiveness of the proposed strategy.
Highlights
To improve the energy utilization efficiency and fulfill the diverse consumer energy demands [1], the traditional power system is gradually developed into an integrated energy system (IES) [2], where electricity, gas and heat dispatch and control in a highly coupled and coordinated manner [3]
In regard of the modeling, diverse models of micro energy system (MES) have been constructed to reflect the static or dynamic characteristics of energy devices and systems in terms of formulated problems including: 1) single coupling component modeling [7] and single energy system modeling [8]. These modeling methods apply to the discrete device or system, so it can’t reflect the multi-device linkage characteristics in multi-energy system. 2) multiple energy flow modeling [9] and simulation-based dynamic characteristics modeling
On account of the aforementioned background, this paper proposes a coordinated control strategy for multi micro energy systems within distribution grid considering dynamic characteristics and contradictory interests
Summary
To improve the energy utilization efficiency and fulfill the diverse consumer energy demands [1], the traditional power system is gradually developed into an integrated energy system (IES) [2], where electricity, gas and heat dispatch and control in a highly coupled and coordinated manner [3]. The present researches of MES tend to develop corresponding models and strategies according to control objectives and time scales, the overall dynamic process of MES operation and management didn’t take enough thought of coordination under different circumstances. On account of the aforementioned background, this paper proposes a coordinated control strategy for multi micro energy systems within distribution grid considering dynamic characteristics and contradictory interests. To reflect the dynamic characteristics of MES operation under multiple time scales, a day-ahead scheduling optimization model with multi-objective constraints is first proposed, followed by a two-layer intra-day scheduling optimization to suppress the cooling and heat power. The rest of the paper is organized as follows: Section II illustrates the framework of the paper; Section III constructs the specific model of energy production, conversion and storage devices; Section IV, Section V and Section VI explain coordinated control strategy of multi-MESs within distribution grid.
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