Method of choosing site and setting capacity for micro power grid

Abstract

The invention provides a method of choosing site and setting capacity for micro power grid. The method comprises the following steps: connecting the micro power grid into different positions; configuring different capacities for the energy storage devices; based on the micro power grid reliability evaluation method, calculating the reliability index of the micro power grid and the overall maintenance costs for energy storage configuration and operation; using the reliability index of the micro power grid and the overall maintenance costs for energy storage configuration and operation as a target; and using the connection positions of the micro power grid and the capacities of the energy storage devices as decision components to optimize planning and seek the connection position and the capacity of energy storage devices with the highest reliability index and the lowest overall maintenance cost for energy storage configuration and operation wherein in the calculation of the reliability index of the micro power grid, the load cutting strategy of the micro power grid shall be considered which relates to the significance weight and the position weight of the load point. The method of the invention can evaluate the reliability of a micro power grid more accurately so as to conduct optimized planning to the micro power grid more properly.

Description

technical field [0001] The invention belongs to the technical field of micro-grids, and relates to a method for evaluating the reliability of a micro-grid and a method for site selection and capacity determination. Background technique [0002] In recent years, with the depletion of traditional energy and the deterioration of the climate environment, the research on green, clean and renewable energy has been accelerated worldwide. Microgrid has played an active role in accepting DG (Distributed Generation, distributed generation) and improving power supply reliability and power quality. However, the intermittence and volatility of DG output will have a negative impact on the reliability of power supply of the microgrid. In addition, at the current level of technology, the development of microgrids does not have an economic advantage. Improving the reliability of power supply is an important reason for attracting investment, that is, the wide application of microgrids must b...

AI Technical Summary

Problems solved by technology

However, with the increase of energy storage capacity and the increase of charging and discharging power, the manufacturing of equipment becomes more and more difficult and the cost becomes more and more expensive. Therefore, it is necessary to take into account the requirements of micro-grid for economy and reliability, and optimize the configuration of energy storage device capacity

In addition, the initial investment cost of energy storage devices is huge, and it is difficult to recover the cost in a short period of time. It is more practical to evaluate the economic benefits of energy storage devices in the entire planning cycle of the microgrid.

[0004] As an effective supplement to the power distribution system, the microgrid has the characteristics of giving priority to power supply to high-level loads and nearby power supply. However, the load shedding strategy in the existing reliability evaluation method only optimizes the load according to the importance of the load point, which cannot be accurately simulated. The actual load shedding scenario cannot reflect the power supply characteristics of the microgrid

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