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Pre-charging circuit of hybrid multi-level converter (HCC) and control method thereof
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A technology of multi-level converters and pre-charging circuits, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc. Inrush current, system overcurrent and other problems
Active Publication Date: 2021-05-28
CHONGQING UNIV
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If these capacitors are not charged and the HCC is directly connected to the DC power supply and works, the HCC will generate a particularly large capacitive inrush current, causing the system to over-current or even burn out.
Moreover, the existing methods cannot charge the voltage of each capacitor in the HCC system to the rated volta
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Embodiment 1
[0043] Such as figure 1 As shown, a pre-charging circuit of a hybrid multilevel converter (HCC), including: including a DC power supply V dc , the current limiting resistor R 0 , cut off switch S 0 , hybrid multilevel converter and load RL;
[0044] DC power V dc , used to provide DC power supply voltage, the voltage level is between 100V and 15kV;
[0045] The hybrid multilevel converter includes a DC bus terminal capacitor C d1 、C d2 、C d3 , the flying capacitor C f and four bridge arms;
[0046] DC bus terminal capacitance C d1 、C d2 and C d3 connected in series;
[0047] DC power V dc The positive terminal of the current limiting resistor R 0 and the DC bus terminal capacitor C of the hybrid multilevel converter d1 connected to the positive pole;
[0048] DC power V dc The negative electrode of the hybrid multilevel converter and the DC terminal capacitor C d3 connected to the negative pole and grounded reliably;
[0049] cut switch S 0 with current lim...
Embodiment 2
[0064] Such as figure 1 As shown, a pre-charging circuit of a hybrid multilevel converter (HCC), including: a DC power supply V dc , used to provide DC power supply voltage, the voltage level is 6kV;
[0065] DC power V dc The positive terminal is connected to the current limiting resistor R 0 , the negative electrode is reliably grounded; the current limiting resistor R 0 The resistance value is 2kΩ;
[0066] cut switch S 0 , with the current limiting resistor R 0 Parallel connection, after the DC bus terminal capacitor reaches the ideal working voltage value, the current limiting resistor R can be reliably cut off 0 And achieve grid-connection with DC voltage; including cut-off switch S 0 The internal resistance of the entire circuit is 0.1Ω;
[0067] Single-phase hybrid multilevel converter, including four bridge arms [eight switches, namely S 1 (S' 1 ), S 2 (S' 2 ), S 3 (S' 3 ), S 4 (S' 4 )], DC bus terminal capacitance (C d1 、C d2 、C d3 ) and the flying...
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Abstract
The invention provides a pre-charging circuit of a hybrid multi-level converter and a control method thereof, and belongs to the technical field of power electronics. The pre-charging circuit comprises a direct-current power supply, a current-limiting resistor, a cut-off switch, the hybrid multi-level converter and a load; the hybrid multi-level converter comprises a direct-current bus end capacitor, a flying capacitor and four bridge arms; the positive electrode of the direct-current power supply is connected with the positive electrode of the direct-current bus end capacitor of the hybrid multi-level converter through a current-limiting resistor; the cathode of the direct-current power supply is connected with the cathode of the direct-current end capacitor of the hybrid multi-level converter; the cut-off switch is connected in parallel with the current-limiting resistor. The pre-charging circuit of the hybrid multi-level converter has the advantages of being low in cost and easy to install; according to the pre-charging control method provided by the invention, the switching state is adjusted in real time, so that each capacitor voltage starts to charge from zero and is stabilized at a rated working voltage value; and the pre-charging control method has the advantages of short charging time and no impact large current, and has popularization and application values in the field of power electronics.
Description
technical field [0001] The invention relates to the technical field of power electronics, in particular to a pre-charging circuit of a hybrid multilevel converter (HCC) and a control method thereof. Background technique [0002] Hybrid Clamped Converter (HCC) is an emerging medium and high voltage multilevel converter. It is composed of a traditional three-level neutral point clamp converter (NPC) and a flying capacitor converter (FC) to generate a four-level phase voltage output. Compared with traditional two / three-level converters, HCC can provide a higher number of output voltage layers, and the voltage and current on the load side have smaller harmonic dv / dt impacts. In addition, compared with NPC, FC and modular multilevel converter (MMC) with the same four-level layer number, HCC has the least number of components; compared with the traditional five-level neutral point clamped converter (5L -ANPC), HCC removes the series voltage sharing problem of switching devices; ...
Claims
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Application Information
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