Self-starting method and self-starting system of energy storage converter

Abstract

The invention relates to a self-starting method and a self-starting system of an energy storage converter. The system mainly comprises a direct current side power supply, a direct current side circuit breaker, a direct current side contactor, an energy storage converter, an alternating current side contactor, a power grid / load, a low capacity switch, a high energy taking power supply, a switch power supply and a direct current load. During starting, a control part is powered by a storage battery first, voltage of high voltage direct current in the storage battery is reduced to voltage required by the control part via the high energy taking power supply, and then the high voltage direct current is supplied to a converter main control panel, a monitoring screen and the like. When the main control panel controls a main circuit to be made, the switch power supply takes electricity from an alternating current side of the energy storage converter, converts the electricity into low-voltage control electricity and replaces the high energy taking power supply for power supply. The starting system and the method do not require an external auxiliary power supply, and can accomplish self-starting no matter whether the energy storage converter is in a synchronization state and an off-grid state; the system reliability is improved; and the cost is saved.

Description

Technical field [0001] The present invention involves a self -starting method and its self -starting system for energy storage variables. technical background [0002] After entering the 21st century, the pattern of world energy has changed, and the development and utilization of new energy technology represented by wind power and photovoltaic power generation has become more and more extensive.At the same time, in order to solve the problems of centralized power systems, long -distance transmission, and far from load centers, the state vigorously develops micro -grid technology with flexible operations and flexible operation methods.Due to the randomness of the output power of new energy power generation and the needs of the micro grid itself, the battery energy storage system has become increasingly highlighting its important role.Quality and other functions.Energy storage bidirectional variables are key equipment for realizing two -way energy transmission between DC energy sto...

AI Technical Summary

Problems solved by technology

[0003] However, there are some defects in the methods used to start the energy storage converter equipment in the energy storage system or micro-grid system. There are two typical ones: one is to take power from the grid and convert it as a control power source to control the energy storage converter. The other method is to equip a UPS as the starting power supply; both methods have their own disadvantages, such as the first method, the energy storage converter cannot start when the power grid fails, and the second method The method needs to configure an additional UPS power supply. Since the general UPS cannot be directly connected to the high-voltage DC power supply, an additional 48V or 96V battery needs to be configured, which increases the cost and reduces the system reliability.

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