Synchronous grid-connected control method for double-path alternating current source seamless switching system

Abstract

The invention relates to the technical field of power electronic control and discloses a synchronous grid-connected control method for a double-path alternating current source seamless switching system so as to realize no impact on a load in a double-path power supply switching process, ensures continuity of user load power supply, and thereby meets safe, reliable, stable and continuous power supply requirements of a user load. The method comprises the following steps that through mode switching of a power electronic intelligent module branch which is associated with two switched power supply branches and a user load and is provided with a power device, and depending on corresponding control interruption of a power electronic intelligent module, a phase and an amplitude are adjusted according to a step length so that no impact is generated on load voltage and current in a dual-power supply switching process; flexible seamless switching is realized, continuity of load power supply is also realized, and continuous, stable and reliable power supply of the load is ensured.

Description

Technical field [0001] The present invention relates to the field of power electronics control, and more particularly to a parallel network control method for a dual alternating source seamless switching system. Background technique [0002] Intelligent is an important guarantee for power grid security, reliability and efficient operation. Under the digital economy, the country vigorously promotes the intelligent upgrade of distribution network, the development of smart grid and the rise of energy Internet have put forward more requirements to power supply power supply, and can achieve uninterruptible power supply, higher security, support Interaction with users, realize visual management of grid and its equipment; [0003] The distribution network switch cabinet is a network hub of users and power distribution systems. Its intelligent and reliable operations are not only related to power grid security, but also affect users' direct impression of power companies, the common needs...

AI Technical Summary

Problems solved by technology

However, since the two-way power supplies are independent of each other, there will be a problem of voltage amplitude and phase asynchrony, and direct switching will generate voltage and current impacts, which will affect the stability of the user's load power supply. The synchronous grid-connected control method of the seamless switching system of two AC sources, using this method, the output voltage amplitude and phase of the device are smoothly adjusted to the other power supply until synchronization, so that there is no impact on the load during the switching process of the two-way power supply, ensuring the user The continuity of load power supply, so as to meet the safe, reliable, stable and continuous power supply requirements of user loads

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