Novel phase-shift space vector modulation strategy
A technology of space vector modulation and vector pulse width modulation, which is applied to output power conversion devices, electrical components, and conversion of AC power input to DC power output. In order to improve the voltage utilization rate, suppress the harmonics of the line voltage and realize the effect of digital control easily
Inactive Publication Date: 2018-06-05
赵吉彬
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Problems solved by technology
However, the voltage utilization rate of the above modulation methods is low, and the implementation is more complicated
Other scholars have proposed a space vector algorithm for capacitor-clamped three-level inverters, but it needs to divide 27 sectors and calculate a large number of trigonometric functions. For capacitor-clamped inverters with more than three levels, the calculation is more complex
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[0013] As shown in the figure, the novel phase-shift space vector modulation strategy of the present invention includes capacitor-clamped three-level inverter, space phase-shift vector pulse width modulation, and capacitor voltage control.
[0014] The capacitor-clamped three-level inverter has four switching tubes and one clamping capacitor in each bridge arm, which saves a large number of diodes compared with the traditional diode-clamped type, and has the advantages of low loss and high efficiency. When the circuit works normally, the voltage of the clamp capacitor must always be kept at Udc / 2, the working states of the switches Sa1 and Sa4 are complementary, and the working states of the switches Sa2 and Sa3 are complementary. When the switches Sa1 and Sa2 are turned on, the output phase voltage is Udc / 2, no current flows through the clamp capacitor, and the capacitor voltage remains unchanged; when the switches Sa3 and Sa4 are turned on, the output phase voltage is -Udc / 2,...
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The invention discloses a novel phase-shift space vector modulation strategy, which is a phase-shift space vector modulation strategy suitable for a multi-level capacitor-clamped inverter, effectivelybalances a voltage of a clamping capacitor by means of phase-shift carriers, and effectively reduces line voltage harmonics through improving the carriers. The novel phase-shift space vector modulation strategy adopts two-level SVPWM to realize multi-level control, does not require complicated sector division and trigonometric function calculation, and is flexible in application and simple to implement. The novel phase-shift space vector modulation strategy can balance the capacitance voltage and improve voltage utilization rate, and effectively suppresses line voltage harmonics. The new modulation method adopts two-level SVPWM, does not require excessive division of sectors and complicated mathematical calculation, and is easy to implement digital control. For capacitor-clamped inverterswith three-level or more, the novel phase-shift space vector modulation strategy has more obvious advantages, obtains driving signals of switches in each layer for layered modulation just by performing phase-shifting on sawtooth carriers for a certain period, and can obtain more level output.
Description
technical field [0001] The invention belongs to the field of space vector modulation, and in particular relates to a novel phase-shift space vector modulation strategy suitable for multi-level capacitor clamp inverters. Background technique [0002] As a power electronic device suitable for high-voltage and high-power energy conversion, multi-level inverters have been used more and more in the industrial field in recent years. [0003] At present, there are three main types of multi-level inverter topologies that are relatively mature: diode clamp type, capacitor clamp type, and cascaded type, which save a large number of diodes than the diode clamp type, with low loss and high efficiency; The combined type saves more DC power supplies, is more economical, and has a large number of switch state combination redundancy, which is easy to expand to more levels. [0004] Modulation methods commonly used in multi-level inverters mainly include carrier overlapping PWM (Carrier Ove...
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IPC IPC(8): H02M7/487
CPCH02M7/487
Inventor 赵吉彬
Owner 赵吉彬