Module topology with instability defense, bus harmonic suppression and energy storage management functions and control method of module topology

Abstract

The invention discloses a module topology capable of realizing instability defense, bus harmonic suppression and energy storage management functions and used for a direct-current power distribution system. The whole module topology is composed of a super capacitor, an energy storage battery pack, two inductors L1 and L2, three switch tubes S1 to S3 and a thin-film capacitor C1 with a small capacitance value. The topology is provided with input sources, namely the super capacitor and the energy storage battery pack, and the output of the topology is directly connected to a system direct current bus in parallel. The invention further discloses a control method which is divided into two parts, wherein one part is an instability defense and harmonic suppression function provided for a Buck / Boost converter composed of the super capacitor, the S2, the S3, the L2 and the C1, and the other one is an energy storage management function provided for the Buck / Boost converter composed of the energy storage battery, the S1, the S2, the L1 and the C1. The module topology is helpful for improving the automation level of power distribution network stability defense, and has great engineering application value and popularization prospect.

Description

technical field [0001] The invention relates to the field of distribution network stability, in particular to a module topology and a control method thereof with the functions of instability prevention, bus harmonic suppression and energy storage management for DC power distribution systems. Background technique [0002] With the increasing use of new energy sources such as photovoltaics and wind energy, and the increasing number of DC loads such as automobiles and lighting, the loads of DC distribution networks are becoming more and more complex. Although each converter in the system is stable when it is individually designed and tested, when they actually form a DC power distribution system, the mismatch between different converters will induce oscillation and even instability of the entire system. Once there are too many sources of instability in the system, it is necessary to establish a system-level instability defense mechanism. [0003] The current system defense sch...

AI Technical Summary

Problems solved by technology

The first type of solution needs to add additional defense devices to the system, which is not suitable for some new energy DC power distribution systems that have volume and cost requirements

Another type of solution is that the energy storage device itself has specific control requirements, such as the energy management of the energy storage unit, the peak shaving and valley filling of the system, etc. These control strategies are not easy to be compatible with the control function of system instability defense

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