Microgrid multi-objective real-time rolling optimization method

Abstract

The invention discloses a microgrid multi-objective real-time rolling optimization method. According to the method, day-ahead economic optimization result considering three-phase imbalance is taken as a guide, decision making is performed on energy storage output of a microgrid within a short time by applying a super-short-term photovoltaic and power prediction result, connecting line power and an energy storage SOC (State of Charge) value are kept to follow the day-ahead economic optimization result as far as possible, and economic operations of a microgrid system are ensured. The microgrid multi-objective real-time rolling optimization method can meet economic index requirements and effectively follow a result of a day-ahead economic optimization algorithm. Damages are imposed on a power distribution system and electrical equipment by a problem of three-phase imbalance occurred in a single-three phase series-parallel system, and an error exists between a day-ahead predicted value and an actual value in practical application of an economic optimization strategy, so that three-phase imbalance degree constraints are considered, the connecting line power decided by day-ahead optimization is taken as a reference value under the condition of microgrid multi-objective real-time rolling optimization, a real-time energy storage power value is acquired through a non-dominated sorting multi-objective algorithm, and microgrid real-time rolling optimization can be realized.

Description

technical field [0001] The invention relates to the technical field of micro-grid economic optimization, in particular to a multi-objective real-time rolling optimization method for micro-grid. Background technique [0002] It is generally considered to be one of the effective ways to use distributed power to connect distributed power to distribution network through microgrid, which can effectively reduce the impact of distributed power's indirectness and volatility on large power grid. Microgrid is a power generation and distribution system that organically integrates distributed power generation devices, converters, loads, energy storage devices, and monitoring, protection and control devices. It has the advantages of autonomous operation, multi-energy complementarity, optimized management, and coordinated control. , is an indispensable and important part of the development process of Energy Internet. Due to the high cost of implementing micro-grids at present, improving ...

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Problems solved by technology

However, this method only considers the short-term economic scheduling optimization of the microgrid system, and does not consider the use of ultra-short-term forecast results to determine the energy storage output of the microgrid in a short period of time, and maintain real-time optimized tie line power and energy storage SOC (State of Charge, state of charge). ) value as far as possible to follow the results of the economic optimization of the day to ensure the economic operation of the microgrid system

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