Optimal grouping configuration method of distributed generations and microgrid

Abstract

The invention provides an optimal grouping configuration method of distributed generations and a microgrid. The method includes the steps of establishing a multi-objective optimization model based on distributed generation and microgrid hybrid integrated supply; solving the multi-objective optimization model by means of a non-dominated genetic algorithm to allow optimal grouping configuration of the distributed generations and the microgrid. The multi-objective optimization model makes full consideration on investment cost, supply reliability and running grid loss and also considers constraints such as microgrid power balance, storage capacity configuration ratio, permeability, node voltage, distributed generation output and group number, complete factors are considered, and the problems in connection positions and volumes of the distributed generations, loads and stored energies can be effectively solved.

Description

technical field [0001] The invention relates to a configuration method, in particular to an optimal group configuration method of a distributed power supply and a microgrid. Background technique [0002] In recent years, the scale and capacity of distributed power sources such as wind power and photovoltaic power generation connected to the grid are gradually increasing, effectively improving the utilization efficiency of new energy, reducing environmental pollution, and increasing the transmission margin of the power transmission and distribution system. However, wind power and photovoltaic power generation are intermittent, random and volatile, and this uncertainty has caused a certain impact on the power grid. When the penetration rate of distributed power reaches a certain level, it will even further affect the safe and stable operation of the system. [0003] A microgrid is a small network composed of distributed power sources, loads and energy storage devices, which c...

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Problems solved by technology

However, the construction of micro-grid requires a large amount of additional investment in energy storage devices, reactive power compensation, and control equipment, resulting in increased investment costs and increased control difficulties.

[0004] The existing schemes for connecting distributed power to the distribution network can be divided into two categories: the first type of scheme is that the distributed power is directly connected to the distribution network and indirectly connected to the grid in the form of a micro-grid, and the scheme of directly connecting the distributed power to the grid The main problem is: the fluctuation of distributed power output power depends on the change of natural conditions, and the randomness of distributed power is strong. The impact is greater, which may further threaten the safe and stable operation of the distribution network. At the same time, the distributed power supply does not have the ability to operate independently. Once a fault occurs in the system, it must immediately exit the operation, and the reliability of the power supply is low; Distributed power sources, loads, and energy storage devices form a microgrid, and then the microgrid is connected to the grid to form a centralized external power supply mode. The main features and problems of this scheme are: when the main grid fails, the energy storage device adopts a voltage-based control strategy, which is an island The system provides voltage and frequency support, enabling the microgrid to operate independently in the off-grid state

[0006] How to optimally configure the capacity and access location of distributed power sources, loads, and energy storage devices in the microgrid, and how to distribute loads and distributed power sources outside the microgrid are the difficulties and core issues of the hybrid power supply scheme. However, for this hybrid integration Power supply scheme, lack of corresponding planning mathematical model and solution algorithm at this stage

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