Novel multifunctional fault current limiting system based on optical storage technology and control method thereof

Abstract

The invention discloses a novel multifunctional fault current limiting system based on an optical storage technology and a control method thereof. The novel multifunctional fault current limiting system mainly comprises a photovoltaic power generation part, a storage battery energy storage part, a PWM converter and a fault current limiting part. The photovoltaic power generation part, the storage battery energy storage part and the PWM converter share a DC bus, and energy is exchanged among the photovoltaic power generation part, the storage battery energy storage part and the PWM converter. When the voltage quality problems of falling, rising and three-phase imbalance happen to the voltage of a power grid, compensating voltages are provided for the power grid through the PWM converter. Meanwhile, when short circuit faults of different types happen to the power grid, the system intrudes inductance into the system for current limiting by controlling the fault current limiting part. The novel multifunctional current fault current limiting system based on the optical storage technology and the control method thereof can achieve the purposes of stabilizing the load power supply voltage, improving the power supply quality and limiting short circuit currents through solar energy resources.

Description

technical field [0001] The invention belongs to the technical field of electric power and new energy, and relates to a novel multifunctional fault current limiting system based on optical storage technology and a control method thereof. Background technique [0002] With the continuous development of the modern power system and the continuous expansion of the system scale, the short-circuit capacity of the system increases, resulting in an increase in the short-circuit current in the event of a fault, and the requirements for the capacity of the primary equipment are getting higher and higher. However, the primary side equipment manufacturing technology has not achieved gratifying results, causing the contradiction between the two to become increasingly prominent. At the same time, with the continuous connection of various nonlinear, shock and unbalanced loads to the power grid, the current and voltage waveforms of the power grid are distorted, resulting in voltage quality p...

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Problems solved by technology

[0004] In order to solve the above technical problems, the present invention discloses a novel multifunctional fault current limiting system based on optical storage technology and its control method, which can not only realize the short-circuit current limiting function of the power grid, but also solve voltage swells, sags and three-phase faults. Power quality problems such as unbalance problems

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