Inverter current compensation control method for neutral point clamped three-level topological structure

A topology and current compensation technology, applied in the field of power transmission and distribution, can solve problems such as abnormal operation of equipment, capacitor breakdown damage, and equipment capacity reduction, so as to improve safety performance, eliminate current superposition, and reduce additional loss. Effect

Inactive Publication Date: 2015-01-21
诺比节能科技(珠海)有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Power quality problems will cause many hazards, such as abnormal operation of equipment, waste products, computer reset, data loss, equipment energy efficiency reduction, shortened life, overheating, burning, capacitor breakdown damage, power factor decline, equipment capacity decline, and power loss increase , pay more electricity bills, etc.

Method used

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  • Inverter current compensation control method for neutral point clamped three-level topological structure
  • Inverter current compensation control method for neutral point clamped three-level topological structure
  • Inverter current compensation control method for neutral point clamped three-level topological structure

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Embodiment 1

[0030] Such as figure 2 , the neutral point clamped three-level topology inverter in this embodiment includes a main control module and a neutral point clamped three-level topology module; the main control module calculates the compensation current according to the detected load voltage and load current Instructions to generate a PWM drive signal to control the switch of the neutral point clamped three-level topology module. The neutral-point clamped three-level topology module will output compensation currents that have the same amplitude as the harmonic current, negative-sequence current, zero-sequence current, and positive-sequence reactive current according to the control of the main control module, but have opposite phases.

[0031] According to the symmetrical component method, the load current can be decomposed into:

[0032]

[0033] In the formula: subscripts 0, 1, 2——zero-sequence component, positive-sequence component, and negative-sequence component;

[0034]...

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Abstract

The invention provides an inverter current compensation control method for a neutral point clamped three-level topological structure. The inverter current compensation control method for the neutral point clamped three-level topological structure comprises the following steps that S1, the load current and the load voltage of each phase are detected; S2, standard sine signals 2sin(omegat-2mpi/3) and 2sinomegat and standard cosine signals 2cos(omega t-2mpi/3) and 2cosomegat according to the load voltage of each phase; S3, the currents obtained in the step S1 and the standard sine signals and the cosine signals obtained in the step S2 are multiplied, filtering is conduced by a low-pass filter with cutoff frequency higher than two times of fundamental frequency, and then the direct-current component of the load current of each phase is obtained; S4, the amplitude value of a compensating current object of the load current of each phase is calculated according to a calculation matrix and the direct-current component, obtained in the step 3, of the load current of each phase; S5, the amplitude value of each compensating current object and the phase of the load current of each phase are multiplied, so that the ideal currents iA, iB and iC of all the phases are obtained; S6, the load currents of all the phases are subtracted from the ideal currents iA, iB and iC of all the phases, so that order signals ia, ib and ic of the compensating currents of all the phases are obtained.

Description

【Technical field】 [0001] This patent relates to the field of electric power technology, specifically in the field of power transmission and distribution, using an inverter composed of a neutral-point clamped three-level topology to compensate harmonic currents, and to correct the negative sequence, zero sequence, and reactive components in the fundamental wave Control method for compensation. 【Background technique】 [0002] While power electronics technology brings convenience and high efficiency, its nonlinear, impact and unbalanced power consumption characteristics also cause serious pollution to the power supply quality of the public grid, and inject a large amount of harmonics and reactive power into the public grid. power. On the other hand, with the popularization and application of a large number of sensitive equipment represented by computers, people have higher and higher requirements for the power supply quality of public power grids, and more stringent requiremen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/487
CPCH02M7/487
Inventor 谭东旭
Owner 诺比节能科技(珠海)有限公司
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