A DC capacitor voltage balance control method under grid single-phase fault
A technology of DC capacitance and voltage balance, which is applied in parallel feeding arrangement of single network, AC circuit arrangement for emergency treatment, conversion of DC power input to DC power output, etc. It can solve the problems of power imbalance between phases and prevent overvoltage damage. , low cost, and the effect of flexible expansion
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[0041] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.
[0042] 1. About the structure of the power router
[0043] In the energy Internet and integrated energy systems, the inherent DC port of the power router has obvious structural advantages to increase the access ratio of new energy and meet the growing demand for DC power. The three-level topology of the delta-connected cascaded power router is as follows: figure 1 shown. Among them, the front stage (AC / DC converter) adopts a cascaded H-bridge (CHB) structure, each phase is composed of N sub-modules in series, and the DC capacitor voltage on the output side is V dcj (j=1,2,...,3N), it can be directly connected to the medium / high voltage distribution network, thus eliminating the...
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