Hybrid control method to suppress neutral-point voltage fluctuation for three-phase three-level VIENNA rectifier
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摘要: 针对三相三电平VIENNA整流器中点电位波动问题，建立了中点电流的数学模型，分析了中点波动形式、并结合中点电流数学模型分析了中点电位波动的根本原因，针对传统固定调节因子法抑制中点电位波动效果较差的缺点，提出了一种结合动态调节因子与电容偏差调节的混合抑制方法，给出了6扇区下偏差调节量和动态调节因子表达式，然后通过查表法将6扇区对应动态调节量注入到调制波中，实现了中点电位尤其三次基频波动的自动抑制，进一步修正后的混合抑制法还可有效抑制电容参数和负载不对称导致的中点大幅度波动，实验结果验证了策略的可行性和有效性。
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关键词:
- 三相三电平VIENNA整流器 /
- 中点电位波动 /
- 混合抑制方法 /
- 动态调节因子
Abstract: Aiming at the problem of the third fundamental frequency fluctuation of the midpoint potential of VIENNA rectifier, the mathematical model of the midpoint current is established. The midpoint fluctuation form is analyzed, and the mathematical reason of midpoint fluctuation is pointed out by analysing the midpoint current mathematical model. To overcome the limitation of the traditional fixed adjustment factor control method to suppress neutral-point voltage fluctuation, a hybrid suppression method combining dynamic adjustment factor and capacitance deviation adjustment is proposed. This method realizes the automatic suppression of the midpoint potential fluctuation through looking for the tables for the deviation adjustment and the dynamic adjustment factor expression within the six sectors which is injected into the three-phase modulation waves, and further modified hybrid suppression method can effectively suppress the large fluctuation hybrid of the midpoint caused by asymmetry of the capacitance parameter and the unbalanced load. The experimental results verify the feasibility and validity of the strategy. -
图 3 基于双闭环控制系统的中点电位混合控制方法框图
Figure 3. Block diagram of dual closed loop control system based on dynamic regulation factor
图 5 传统固定调节因子与混合中点控制法对比波形
Figure 5. Waveforms of different neutral point control methods
图 6 电容参数和负载不一致时直流侧等效电路
Figure 6. Equivalent DC side circuit under asymmetric capacitance and unbalanced load
图 7 传统固定因子算法和改进后混合中点控制法对比波形
Figure 7. Waveforms of different neutral point control methods
表 1 各扇区内中点电流及其对中点电位的影响
Table 1. Neutral point current expressions in each sector and its effects on neutral point
sector No. neutral point current expression capacitor voltage 1 io=-2kumbumc < 0 C1↑ C2↓，C1>C2 2 io=-2kumbuma < 0 C1↓ C2↑，C1 < C2 3 io=-2kumaumc < 0 C1↑ C2↓，C1>C2 4 io=-2kumbumc < 0 C1↓ C2↑，C1 < C2 5 io=-2kumbuma < 0 C1↑ C2↓，C1>C2 6 io=-2kumaumc < 0 C1↓ C2↑，C1 < C2 
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表 2 各扇区内调节因子和调节量表达式
Table 2. Regulation factor expression in each sector
sector No. neutral-point voltage adjustment factor md neutral-point deviation adjustment umd influence on neutral-point current influence on the neutral-point voltage fluctuation 1，4 $-\frac{u_{\mathrm{mb}} u_{\mathrm{mc}}}{u_{\mathrm{ma}} \mathit{\Delta}_{\mathrm{uc}}} $ $-\frac{u_{\mathrm{mb}} u_{\mathrm{mc}}}{u_{\mathrm{ma}}} $ reduced reduced 2，5 $-\frac{u_{\mathrm{mb}} u_{\mathrm{ma}}}{u_{\mathrm{mc}} \mathit{\Delta}_{\mathrm{uc}}} $ $ -\frac{u_{\mathrm{mb}} u_{\mathrm{ma}}}{u_{\mathrm{mc}}}$ reduced reduced 3，6 $ -\frac{u_{\mathrm{ma}} u_{\mathrm{mc}}}{u_{\mathrm{mb}} \mathit{\Delta}_{\mathrm{uc}}}$ $ -\frac{u_{\mathrm{ma}} u_{\mathrm{mc}}}{u_{\mathrm{mb}}}$ reduced reduced
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表 3 中点电位动态调节因子和调节量表达式
Table 3. Neutral voltage dynamic regulation quantity expression
sector No. dynamic adjustment factor k2 dynamic adjustment um 1，4 $1-\frac{u_{\mathrm{mb}} u_{\mathrm{mc}}}{u_{\mathrm{ma}} \mathit{\Delta}_{\mathrm{uc}}} $ $ \mathit{\Delta}_{\mathrm{uc}}-\frac{u_{\mathrm{mb}} u_{\mathrm{m} \mathrm{c}}}{u_{\mathrm{ma}}}$ 2，5 $1-\frac{u_{\mathrm{mb}} u_{\mathrm{ma}}}{u_{\mathrm{mc}} \mathit{\Delta}_{\mathrm{uc}}} $ $\mathit{\Delta}_{\mathrm{uc}}-\frac{u_{\mathrm{mb}} u_{\mathrm{ma}}}{u_{\mathrm{mc}}} $ 3，6 $1-\frac{u_{\mathrm{mc}} u_{\text {ma }}}{u_{\mathrm{mb}} \mathit{\Delta}_{\mathrm{uc}}} $ $\mathit{\Delta}_{\mathrm{uc}}-\frac{u_{\mathrm{mc}} u_{\mathrm{ma}}}{u_{\mathrm{mb}}} $
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表 4 系统实验参数
Table 4. Parameters for system experiment
grid side line to line voltage/V DC side voltage/V load /Ω switching frequency /kHz filter inductor / H filter capacitor /μF 100 200 180~120 5 5 1600
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