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Three-phase grid-connected mmc static model and establishment method for DC voltage control characteristics

A technology of DC voltage and control characteristics, applied in the field of power electronics, can solve complex, manpower-intensive and material-resource-intensive problems

Active Publication Date: 2020-09-25
POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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Problems solved by technology

[0004] However, although the equivalent model of the grid-connected MMC in the dq rotating coordinate system has undergone simplification of differential equations and matrix changes, if it is directly analyzed for the DC voltage control characteristics in the static characteristics, it is also more complicated and will cost A lot of manpower and material resources lead to application limitations

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  • Three-phase grid-connected mmc static model and establishment method for DC voltage control characteristics
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  • Three-phase grid-connected mmc static model and establishment method for DC voltage control characteristics

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[0032] The drawings are for illustrative purposes only, and should not be construed as limitations on this patent; in order to better illustrate this embodiment, some parts in the drawings will be omitted, enlarged or reduced, and do not represent the size of the actual product;

[0033] For those skilled in the art, it is understandable that some well-known structures and descriptions thereof may be omitted in the drawings. The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0034] see figure 1 , v su , v sv , v sw is the grid three-phase voltage source, R s and L s are the line resistance and inductance, respectively, from the three-phase equivalent model of the grid-connected MMC, and the following system differential equations can be written respectively:

[0035]

[0036]

[0037]

[0038]

[0039] In the formula, R sac =R s +R ac , L sac =L s +L ac . Fro...

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Abstract

The invention provides a three-phase grid-connected MMC static model for direct-current voltage control characteristics and a building method. An equivalent model in a dq rotating coordinate system ofa grid-connected MMC is provided, on this basis, the static characteristics of the MMC is analyzed, the output direct-current voltage gain characteristics of the MMC under the different parameters and the amplitude modulation ratio are analyzed, it is indicated that the MMC has the working modes of inductance leading and capacitance leading which can be stable in change in the full range of the amplitude modulation ratio, and between the two modes, a system voltage gain equation has a pole; the input power characteristics of the MMC are researched, the working range under the system direct-current voltage in the inductance leading mode and the capacitance leading mode is analyzed, and it is proved that for the grid-connected MMC, under certain condition, the feasibility of the low direct-current voltage pressure is achieved. The three-phase grid-connected MMC static model is used for analyzing the physical characteristics of the three-phase grid-connected MMC in the steady state, themodel is simplified through system differential equation combination and matrix transformation, and the groundwork is laid for control over the grid-connected MMC.

Description

technical field [0001] The invention relates to the technical field of power electronics, and more specifically, relates to a three-phase grid-connected MMC static model and establishment method for DC voltage control characteristics. Background technique [0002] The typical MMC grid-connected topology diagram is as follows: figure 1 As shown in the figure, v su , v sv , v sw is the grid three-phase voltage source, R s and L s are the line resistance and inductance respectively, and the parallel connection of the two bridge arm inductances is equivalent to L ac The inductor is connected in series on the AC side. When the MMC is connected to the grid, it can be used to regulate the current flowing into the MMC from the grid. If L ac If it is not enough to achieve the goal of regulation, a series inductor L is needed on the AC side s , for compensating L ac lack of. DC side, voltage source v d , inductance L L and resistor R L constitutes an active DC load network...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38
Inventor 钱峰易仕敏廖鹏张子泳伍双喜罗钢刘俊磊娄源媛吴国炳杨银国
Owner POWER DISPATCHING CONTROL CENT OF GUANGDONG POWER GRID CO LTD
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