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A Control Method for Midpoint Voltage Balance and Common Mode Voltage Suppression of Three-level Inverter

A three-level inverter and voltage balancing technology, which is applied to electrical components, output power conversion devices, and AC power input to DC power output. It can solve the impact of output waveform quality, uneven voltage division, and AC Fluctuation and other problems, to overcome the incomplete balance of the midpoint voltage, reduce the common mode voltage output, and achieve the effect of balanced control

Active Publication Date: 2018-05-22
ANHUI UNIVERSITY
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Problems solved by technology

[0002] In the diode-clamped multi-level inverter, the neutral current flows through the two DC side capacitors, which makes the voltage division of the two capacitors uneven and generates corresponding AC fluctuations.
The balance of the midpoint voltage has always been the focus of research and the key to the application of multi-level neutral point clamped inverters. If the midpoint voltage balance of the inverter cannot be guaranteed for a long time, the quality of the output waveform will be seriously affected. impact, even waveform degeneration in extreme cases

Method used

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  • A Control Method for Midpoint Voltage Balance and Common Mode Voltage Suppression of Three-level Inverter
  • A Control Method for Midpoint Voltage Balance and Common Mode Voltage Suppression of Three-level Inverter
  • A Control Method for Midpoint Voltage Balance and Common Mode Voltage Suppression of Three-level Inverter

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Embodiment Construction

[0029] A control method for mid-point voltage balance and common-mode voltage suppression of a three-level inverter, comprising the following steps:

[0030] S1, taking A large area as an example, define a new virtual vector:

[0031] V NM0 =k A0 V M0 +k A1 V S0 +k A2 V S1 ; among them, k A0 ,k A1 ,k A2 ∈[0,1], and k A0 +k A1 +k A2 = 1; V S0 For the small vector POO / ONN, V S1 For the small vector PPO / OON, V M0 is the medium vector; since the new virtual medium vector includes two pairs of small vectors, the control is more flexible, so it can be adjusted by adjusting the parameter k A0 , k A1 , k A2 Control the action time of the medium vector and each small vector to realize the control of the neutral point voltage balance and other optimization objectives. In practical application k A0 , k A1 , k A2 The value of is to consider the influence of narrow pulse and dead zone.

[0032] In this example, take

[0033] S2, utilize the symmetry of each district ...

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Abstract

The present invention relates to a control method for neutral point voltage balance and common mode voltage suppression of a three-level inverter based on a new space vector modulation method, and defines a new virtual neutral vector, so that in the new space vector Any area contains two pairs of small vectors, and the small vector with the larger value of the midpoint voltage balance coefficient is used to modulate the midpoint voltage balance, which is called the midpoint voltage regulation small vector VSNP; the other pair of small vectors is used to suppress the common mode Voltage output, called common-mode voltage regulation small vector VSCMV; by limiting the absolute value of the common-mode voltage amplitude to a range less than or equal to Udc / 6 to reduce the fluctuation of the common-mode voltage; therefore, it can ensure the balance of the midpoint voltage Under the premise, the three-phase switching sequence is flexibly formed by reasonably selecting a small vector with a small output common-mode voltage, thereby suppressing the common-mode voltage output of the inverter.

Description

technical field [0001] The invention relates to a three-level inverter control strategy, in particular to a control method for neutral point voltage balance and common-mode voltage suppression of a three-level inverter. Background technique [0002] In the diode-clamped multi-level inverter, the neutral current flows through the two DC side capacitors, which makes the voltage division of the two capacitors uneven and generates corresponding AC fluctuations. The balance of the midpoint voltage has always been the focus of research and the key to the application of multi-level neutral point clamped inverters. If the midpoint voltage balance of the inverter cannot be guaranteed for a long time, the quality of the output waveform will be seriously affected. impact, and even waveform degeneration in extreme cases. In recent years, the neutral point voltage balance of the diode neutral point clamped inverter has been widely concerned by scholars at home and abroad. The control me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/487H02M1/12
CPCH02M1/12H02M7/487H02M1/123
Inventor 芮涛胡存刚王群京罗方林
Owner ANHUI UNIVERSITY
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