Mixed micro-grid system of large-scale energy recycling power battery pack test device

Abstract

The invention discloses a mixed micro-grid system of a large-scale energy recycling power battery pack test device. The mixed micro-grid system comprises a tested power battery pack and an alternating-current grid, and further comprises a test unit, a direct-current voltage-variable unit, an alternating-current voltage-variable unit, a direct-current bus and an energy storage unit. The test unit is connected between the power battery pack and the direct-current bus and comprises a bidirectional DC/DC conversion assembly which is used for enabling the voltage in the power battery pack to be matched with the voltage in the direct-current bus. The mixed micro-grid system has the advantages that a power battery pack test grid-connected alternating-current micro-grid power generation system generally adopted in current power battery pack manufacturers is changed through the mentioned components of the system; the design of a test device converter is facilitated, in other words, the test device converter is mainly composed of a one-stage converter instead of a two-stage converter and a filter in the prior art; meanwhile, the energy storage battery pack and a super-capacitor set are arranged, and therefore stability of the voltage of the direct-current bus of the high and low voltage side in a direct-current micro-grid is ensured, and energy supplementing and supporting are achieved.

Description

technical field [0001] The invention belongs to the technical field of power battery test energy recovery and relates to a hybrid micro-grid system for large-scale energy recovery power battery pack test equipment. Background technique [0002] With the rapid development of electric vehicle-related technologies in my country, the performance of power battery packs for electric vehicles has become a key factor affecting the successful promotion of electric vehicles. At present, my country has become the largest producer of power batteries for electric vehicles. Battery manufacturers Has reached 700 to 800. Since the performance of the battery pack needs to be evaluated after production, it is necessary to perform a charge and discharge test on the battery pack. In order to achieve high test accuracy, at present, most battery manufacturers in China use grid power during charging tests, and use power devices for testing in the linear amplification region during discharge tests,...

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to solve the shortcomings of the existing power battery pack test and recovery technology, such as the various working modes of the AC micro-grid system, the difficulty in parallel coordination and control of multiple test ACs, the coexistence of low power and high power, and the coexistence of single-phase and multi-phase. , proposed a hybrid microgrid system for large-scale energy recovery power battery pack test equipment

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