Distributed energy storage adaptive droop control method based on voltage sensitivity matrix

Abstract

The invention provides a distributed energy storage adaptive power voltage droop control method based on a voltage sensitivity matrix, and belongs to the technical field of power grid voltage treatment. The method comprises the steps of firstly, adopting active-voltage droop control for each distributed energy storage access node, designing each droop coefficient by injecting an active-voltage sensitivity matrix to the node, then establishing a closed-loop system droop control model comprising a droop control part and a power system response part by using the active-voltage sensitivity matrix, predicting the voltage value of each node after droop control is used by utilizing an equation established according to the closed-loop model so as to adjust the droop coefficient in time, and preventing the condition that the node voltage is out of limit after the droop control is used. Compared with the prior art, according to the scheme, the droop coefficient is adaptively adjusted according to the real-time operation condition of the system, so that the voltage of the system is operated within a reasonable range, the operation safety of the system is improved, and meanwhile, the absorption capacity of a power distribution network for photovoltaic energy is ensured.

Description

technical field [0001] The invention belongs to the technical field of grid voltage management, and in particular relates to a distributed energy storage self-adaptive droop control method based on a voltage sensitivity matrix. Background technique [0002] In order to improve the consumption of photovoltaic energy, the main voltage regulation means can be divided into active power control means and reactive power control means. For distribution networks with large R / X, the use of active power control methods can significantly improve the voltage compared with reactive power control methods. Therefore, distributed energy storage is often introduced, and active power-voltage droop control is used for energy storage access nodes to achieve local voltage governance. However, the traditional droop control with fixed droop coefficient belongs to the design of the droop coefficient completely depends on the forecast of photovoltaic output in the day, so it is difficult to adapt t...

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Problems solved by technology

However, the traditional droop control with fixed droop coefficient belongs to the design of the droop coefficient completely depends on the forecast of photovoltaic output in the day, so it is difficult to adapt to the situation of large changes in the injected power of the power generation side in the distribution network with high penetration rate of new energy, which will easily lead to various The output of node energy storage is not reasonable, and the node voltage fluctuates greatly or even exceeds the limit

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