Neutral point potential balance control method for direct current side in NPC three-level structure
A potential balance and control method technology, which is applied in the direction of converting AC power input to DC power output, photovoltaic power generation, electrical components, etc., can solve the problems of midpoint potential imbalance, adverse performance and safety of inverters, and inaccurate calculation of zero-sequence voltage. Accurate and other issues, to achieve the elimination of DC bias and low frequency fluctuations, the control algorithm is simple and easy, and the effect of improving the quality of output current
Active Publication Date: 2013-11-27
XIAN LONTEN RENEWABLE ENERGY TECH
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Abstract
The invention relates to a neutral point potential balance control method for a direct current side in an NPC three-level structure. A neutral point clamping type three-level inverter circuit is adopted in a photovoltaic grid-connected inverter, so that neutral point potential imbalance is prone to being caused; a software control algorithm, namely, a control method conducting hysteresis comparison on a neutral point cannot not completely eliminate low frequency fluctuation of neutral point potential; a control algorithm for injecting zero sequence voltage is relatively complex. The neutral point potential balance control method for the direct current side in the NPC three-level structure is characterized in that the difference value of one half of busbar voltage on the direct current side of a photovoltaic inverter and neutral-point voltage, the current value which needs to be injected into the neutral point in a present switching period is obtained by a PI regulator, the acting time of redundant small vectors in each sector in space vector pulse width modulation is used as a modulation method, and the allocation proportion of the redundant small vectors in one switching period is computed. The neutral point potential balance control method for the direct current side in the NPC three-level structure eliminates direct current bias and low frequency fluctuation of the neutral-point potential of a diode clamping type three-level inverter on the existing hardware condition, and neutral-point balance is achieved.
Application Domain
Ac-dc conversionPhotovoltaic energy generation
Technology Topic
DC biasBus voltage +14
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