Active power distribution network distributed voltage control method considering global sensitivity

Abstract

The invention provides an active power distribution network distributed voltage control method considering global sensitivity, and the method comprises the following steps: 1), carrying out the modeling of an active power distribution network and internal control equipment, and forming an active power distribution network voltage control optimization problem; (2) based on the voltage control optimization problem in the step (1), mathematical transformation is further carried out on the voltage control optimization problem, and three global sensitivities, namely partial derivatives of all node voltage out-of-limit to active power, reactive power and voltage of nodes, are obtained through derivation; 3) carrying out detailed expansion and arrangement on the voltage control optimization problem converted in the step 2) so as to establish a distributed round-trip communication rule between a root node and a leaf node, and carrying out real-time calculation on global sensitivity; and 4) based on the global sensitivity obtained in the step 3), realizing coordinated control of each distributed device by using a gradient descent method so as to obtain a real-time voltage regulation scheme of each node of the distributed active power distribution network. The voltage control method can effectively ensure the voltage safety of the power distribution network.

Description

technical field [0001] The invention relates to a voltage control method of an active distribution network, in particular, a distributed voltage control method of an active distribution network considering global sensitivity is designed. Background technique [0002] In recent years, the penetration rate of renewable energy such as photovoltaics in the distribution network has continued to increase. They often have large fluctuations and uncertainties. Therefore, they will seriously affect the safety and reliability of the distribution network operation, such as causing The voltage limit problem of the distribution network, etc. In order to alleviate the interference of renewable energy fluctuations on the operation of the distribution network, the distributed energy resources on the demand side can be controlled to ensure the voltage security of the distribution network. For example, controllable resources including energy storage and photovoltaic inverters can quickly con...

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Problems solved by technology

However, the traditional distributed control voltage regulation also has certain problems: 1. Traditional distributed consistent voltage control methods usually do not consider network parameters and topology, which affects the quality of voltage regulation; 2. When distributed optimization of voltage control problems When calculating, its convergence requirements will still lead to a large number of iterations and long communication time, making it difficult for these distributed methods to be applied in real-time control; 3. Existing distributed voltage control methods are usually only used for the control of a single device, Difficult to achieve coordinated and rapid control of multiple devices

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