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Selective harmonic elimination optimization method for tri-level single-phase-bridge inverter

A specific harmonic elimination and single-phase bridge technology, applied in the direction of irreversible DC power input conversion to AC power output, electrical components, output power conversion devices, etc., can solve the problem that the output voltage distortion rate is difficult to meet the national standard requirements and affect the control The effect and the number of harmonic elimination cannot be very high, etc.

Inactive Publication Date: 2006-12-13
SIEYUAN QINGNENG ELECTRICAL & ELECTRONICS
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Problems solved by technology

[0003] For medium and high-capacity DSTATCOM, limited by the capacity and loss of switching devices, the switching frequency is generally relatively low. When using a general specific harmonic elimination method, the number of harmonic elimination cannot be very high, and the output voltage distortion rate is difficult to meet the national standard requirements, which also affects The control effect, so it is necessary to study the method of improving the harmonic elimination performance at a certain switching frequency

Method used

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  • Selective harmonic elimination optimization method for tri-level single-phase-bridge inverter
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  • Selective harmonic elimination optimization method for tri-level single-phase-bridge inverter

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Embodiment Construction

[0018] The present invention belongs to a kind of method, and specific principle is as follows.

[0019] Such as figure 1 As shown, the inverter is composed of two bridge arms, and each bridge arm can output three level values:

[0020]

[0021] The specific harmonic elimination method eliminates harmonics of a certain order by setting a gap at a specific position where the bridge arm outputs a square wave voltage. These specific positions are commonly referred to as specific harmonic elimination angles, and these angles need to be solved by numerical methods. In the case of ensuring that the output square wave is an odd function and 1 / 4 cycle symmetric, only need to consider the switch angle within 1 / 4 cycle to solve, record the number of angles as N.

[0022] The waveform of the output voltage of the single arm of the inverter bridge is as follows: figure 2 shown. right figure 2 The waveform of is expanded by Fourier series, and the coefficient of the harmonic orde...

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Abstract

The invention discloses a specific harmonic eliminating optimum method of three-level single-phase bridge inverter, which is characterized by the following: calculating the harmonic eliminating angle of single-phase bridge left and right bridge arms; eliminating more high order harmonic wave; reaching less harmonic wave distortion rate of inverter output voltage; improving harmonic wave property of output voltage effectively.

Description

technical field [0001] The invention belongs to the technical fields of flexible power transmission and distribution of power systems, power electronics and user power. It specifically belongs to the specific field of harmonic elimination of three-level single-phase bridge inverters. Background technique [0002] Distribution network static synchronous compensator (DSTATCOM), as a parallel voltage source inverter device, achieves the purpose of injecting and absorbing reactive power into the grid by outputting voltage with a certain amplitude and phase. In practical applications, there are many options for the pulse width modulation strategy of the voltage source inverter, such as sinusoidal pulse width modulation (SPWM, Sinusoidal Pulse Width Modulation), space vector PWM and specific harmonic elimination PWM. Among them, the specific harmonic elimination method It is widely used by reactive power compensators, because it eliminates some specific orders of harmonics by set...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/14H02M7/48H02M7/521
Inventor 张春朋吴春晖赵香花
Owner SIEYUAN QINGNENG ELECTRICAL & ELECTRONICS
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