Output filter for a power conversion system and power conversion system

A technology of power conversion system and output filter, applied in the direction of converting AC power input to DC power output, output power conversion device, transformer/inductor core, etc., to achieve optimized volume and cost, compact and solution, and high efficiency The effect of the solution

CN108432106AActive Publication Date: 2018-08-21英捷电力技术有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2018-08-21

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Abstract

Output filter for a power conversion system comprising a plurality of power converters connected in parallel, comprising a magnetic core (1), and a filtering winding (Wpc1, Wpc2, ..., Wpcn) for each power converter, wounded around a corresponding segment (S1, S2, ..., Sn) of the magnetic core (1). Each filtering winding (Wpc1, Wpc2, ..., Wpcn) comprises a first end (Cpc1, Cpc2, ..., Cpcn) for being connected to a power converter and a second end, the second ends being connected to each other. The filter (100) comprises an additional winding (Wad) wounded around an additional segment (Sad) of the magnetic core (1), said additional winding (Wad) comprising an end (Cg) for being connected to an electrical grid and a second end connected to the second ends of the filtering windings (Wpc1, Wpc2, ..., Wpcn).
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Description

technical field

[0001] The invention relates to an output filter for a power conversion system comprising a plurality of power converters connected in parallel. Background technique

[0002] As the uniform power of power generation units increases, it is becoming more and more common to use parallel power converter based conversion topologies in renewable energy generation systems such as wind turbines or photovoltaic systems. Along with technological developments, grid regulations have become more demanding and requirements and recommended practices have been established regarding the quality of power delivered to the grid.

[0003] Power converters are known to generate output currents and voltages that include harmonic components at the switching frequency (SWF) of the power converter and multiples thereof. With the aim of limiting these harmonic components below a certain maximum value, such as e.g. figure 1 As shown, it is known to install an output passive filter suc...

Examples

Embodiment Construction

[0023] The output filter 100 of the present invention is adapted to comprise a plurality of parallel connected power converters PC 1 ,PC 2 ,...,PC n The power conversion system 200, as in figure 2 shown by way of example consists of two parallel connected power converters PC 1 and PC 2 power conversion system. In this case, the power converter PC 1 and PC 2 It is a DC / AC converter, but other kinds of converters are also possible. An output filter 100 is provided between the system 200 and preferably the grid G, which is connected to said power converter PC 1 and PC 2 The output terminal of each of them is connected to the grid G.

[0024] The output filter 100 may also be connected between the system 200 and the terminals of the generator. Parallel connected power converter PC 1 ,PC 2 ,...,PC n Then may be added also comprising at least one generator (not shown in the drawings) and at least one power converter PC associated to the generator 1 ,PC 2 ,...,PC n s...