Coherent equivalent method for grid-connected inverters in new energy power generation systems based on generalized Hamiltonian action

Abstract

The invention relates to a new energy resource power generating system grid connected inverter coherency based equivalence method based on generalized Hamiltonian acting amount. The method comprises the two steps of coherency discrimination and parameter polymerization: a Hamiltonian model of a single inverter is built; the generalized Hamiltonian acting amount is deduced; inverters with the differential proportion of the generalized Hamiltonian acting amount are judged to be in a coherency group; according to an energy conservation constraint, a acting quantity criterion can be simplified into a grid connected current criterion; the coherency inverters are subjected to structure parameter polymerization and control parameter fitting. From a physical concrete of coherency based equivalence, a practical standard for judging the inverter coherency is provided; on the basis of a structure remaining principle, the equivalence order reduction of a plurality of inverters with similar electromagnetic energy conversion processes is realized, so that the system after the equivalence has the specific physical significance; a simulating calculation process is simplified; important engineering application values are realized.

Description

technical field [0001] The invention belongs to the field of electrical engineering, and relates to the dynamic equivalence of grid-connected inverters in new energy power generation systems, in particular to a coherent equivalent method for multi-grid-connected inverters. Background technique [0002] With the wide application of new energy power generation, the grid connection characteristics of wind farms and photovoltaic power stations and their impact on large power grids are of great significance. However, due to the large number of converters in large wind farms and photovoltaic power stations, and their control methods , the simulation analysis takes up a lot of computing space. On the premise of retaining the system characteristics, the order reduction and simplification of the converter can effectively solve this problem. [0003] Dynamic equivalence methods mainly include coherent equivalence method and mode equivalence method. The coherent equivalent method red...

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Problems solved by technology

None of the above equivalent methods take into account the similarity of the electromagnetic energy conversion process of the inverter, and their equivalent methods do not have universal applicability in the application environment

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