A five-level npc type inverter passive control system and method

A passive control and inverter technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., can solve the problems of increased complexity and coupling of grid-connected systems, and achieve high The effect of power factor grid connection, low harmonics, and small harmonic loss

Active Publication Date: 2019-12-27
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0003] With the development of classical control theory and modern control, PI control, quasi-PR control and sliding mode variable control are applied to the control of inverters. These control methods can solve some problems to a certain extent, but with grid-connected With the increase of system complexity and coupling, these methods can no longer meet the needs

Method used

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  • A five-level npc type inverter passive control system and method
  • A five-level npc type inverter passive control system and method
  • A five-level npc type inverter passive control system and method

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Embodiment

[0071] figure 1 It is a single-stage three-phase diode-clamped five-level inverter grid-connected system topology. The equivalent resistance of the three-phase line is R a , R b , R c , the equivalent inductance is L a , L b , L c , and R a = R b = R c = R, L a =L b =L c =L f ; The 4 voltage dividing capacitors on the DC side are C 1 、C 2 、C 3 and C 4 , U dc is the DC voltage source voltage, I dc is the DC power side current; T A1 -T A8 , T B1 -T B8 , T C1 -T C8 8 switching tubes on the bridge arms of phase A, phase B and phase C respectively; V A1 -V A6 , V B1 -V B6 , V C1 -V C6 They are 6 clamping diodes on the bridge arms of phase A, phase B and phase C respectively; S A , S B , S C They are the switch drive signals on each bridge arm of phase A, phase B, and phase C respectively, wherein: the drive signals of the eight switch tubes of the bridge arm of phase A are S A1 , S A2 , S A3 , S A4 , S A5 , S A6 , S A7 , S A8 , B, C phase and...

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Abstract

The invention relates to a passive control system and method for a five-level NPC type inverter. The system comprises a sensor collection unit, a coordinate transformation unit, an inverter output three-phase current setting unit, a passive controller and an SPWM modulation unit, wherein the sensor collection unit is used for collecting inverter output three-phase current and power grid three-phase voltage in real time; the coordinate transformation unit is used for converting the output three-phase current and the power grid three-phase voltage into components in a coordinate system of d andq correspondingly; the inverter output three-phase current setting unit is used for setting the reference values of the components of the inverter output three-phase current on d axis and q axis; thepassive controller is connected to the coordinate transformation unit and the inverter output three-phase current setting unit and is used for outputting an SPWM modulation signal; the SPWM modulationunit is used for carrying out SPWM modulation according to the SPWM modulation signal output by the passive controller and outputting the PWM pulse signal of a switching device in the five-level NPCtype inverter. Compared with the prior art, the dynamic and static stability of the system is improved, and the inverter output current harmonics are reduced.

Description

technical field [0001] The invention relates to a five-level NPC inverter control system and method, in particular to a five-level NPC inverter passive control system and method. Background technique [0002] In recent years, with the rapid development of renewable energy such as wind power and photovoltaics, the requirements for the stability, conversion efficiency, and power and voltage levels of grid-connected inverters are also getting higher and higher. Traditional two-level inverters can no longer meet the demands of modern industry on voltage and current harmonics and the pressure on power electronic devices. The proposal of the five-level inverter solves the problems existing in the two-level inverter. Compared with three-level inverters, five-level inverters have lower output current and voltage harmonics and less electromagnetic interference, and are widely used in high-voltage and high-power applications. Compared with other multi-level inverters, five-level inv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/487
Inventor 程启明李涛孙伟莎陈路程尹曼魏霖沈磊王玉娇
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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