Three-phase power spring topology and phase control method thereof

Abstract

The invention discloses a three-phase power spring topology and a phase control method thereof. A three-phase power spring is composed of a three-phase full-bridge inverter or a three-phase transformer or three single-phase transformers, a critical load, a non-critical load and the like, wherein the three-phase full-bridge inverter or the three-phase transformer or the three single-phase transformers installed in a three-phase four-wire-system system serve as a core, and the critical load and the non-critical load are connected with the three-phase full-bridge inverter or the three-phase transformer or the three single-phase transformers. The power spring is provided aiming at instability of renewable energy in a micro-grid. According to the three-phase power spring and the phase control method thereof, voltage and energy fluctuation is transferred to the non-critical load to maintain voltage balance on the critical load, and the fluctuation influences caused to grid voltage by intermittency of new energy can be fundamentally solved. The topology is mainly applied to a new energy power generation system to stabilize voltage of the critical load, and is especially suitable for being applied to a building power supply system to achieve three-phase load balance. Actual power supply systems are mostly three-phase four-wire-system systems, the systems usually suffer from balance unbalance problems, the purpose of three-phase load balance is achieved while the voltage of the critical load is stabilized through intervention of the three-phase power spring, and high practicality is achieved.

Description

technical field [0001] The invention relates to the technical field of smart grid control, and relates to a three-phase electric spring topology and a phase control method thereof. Background technique [0002] At present, the full integration and consumption of intermittent energy such as wind energy and solar energy is the key to solving the traditional primary energy storage limit and the environmental problems caused by combustion. However, the intermittency and instability of new energy sources make it difficult to accurately estimate the total power generation capacity on the power generation side, and it is difficult to fundamentally solve the above problems with the traditional power system control method that the power load determines the power generation. [0003] The concept of electric spring (Electric Spring, ES) subverts the traditional thinking of the power system, which can realize the change of power consumption with the change of power generation, and the a...

AI Technical Summary

Problems solved by technology

[0004] The current ES topology is a single-phase structure, which can only adjust voltage and power consumption in a single-phase system. This topology is suitable for single-phase power supply household power supply systems, but in practical applications, it is three-phase in many cases. Four-wire power supply, if only single-phase structure is still considered, it will greatly limit the application range of ES

For example, in a large building power supply system with three-phase power supply, the current ES cannot play a role

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