Inverter circulation suppression method based on model prediction virtual voltage vector control

A virtual voltage and vector control technology, applied in the direction of irreversible DC power input conversion to AC power output, AC power input conversion to DC power output, electrical components, etc. Affect system performance, output current distortion, etc.

Active Publication Date: 2020-03-24
FUZHOU UNIV
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Problems solved by technology

However, a single three-level inverter is difficult to meet the application scenarios of large-scale photovoltaic and wind power, so the parallel operation of multiple inverters has become the mainstream trend, which can improve system reliability and reduce costs while increasing system output power
[0003] However, the non-isolated three-level inverters with a common AC and DC bus will generate zero-sequence circulating current between inverters due to differences in hardware parameters, dead time, and control signal delays, which will seriously affect the operating performance of the system, such as Increase system loss, cause severe distortion of output current and offset of neutral point voltage, etc., and lead to system collapse

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  • Inverter circulation suppression method based on model prediction virtual voltage vector control
  • Inverter circulation suppression method based on model prediction virtual voltage vector control
  • Inverter circulation suppression method based on model prediction virtual voltage vector control

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Embodiment Construction

[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] Please refer to figure 1 , the present invention provides a method for suppressing inverter circulation based on model-predicted virtual voltage vector control, comprising the following steps:

[0038] Step S1: Measure i a1 (k), i b1 (k), i c1 (k), V C1P (k), V C1N (k), e(k), the value at time k; where i a1 , i b1 , i c1 are the three-phase filter inductor currents of the three-level NPC inverter on the upper side, which are collected by Hall current transformers, V C1P , V C1N Respectively, the upper / lower side support capacitor voltage of the upper side three-level NPC inverter is collected through the Hall voltage transformer, and e is the grid voltage at the grid-connected side, which is collected through the Hall voltage transformer;

[0039] Step S2: Apply the optimal switching vector v found in the previous switching cycle opt (...

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Abstract

The invention relates to a three-level NPC inverter zero-sequence circulation suppression method based on model prediction virtual voltage vector control. Through analyzing a space vector of a three-level inverter, seven voltage vectors contributing zero to zero-sequence circulating current are selected as basic vectors, and 12 virtual voltage vectors are synthesized through the basic vectors, sothat the distortion rate of output current of the parallel system can be remarkably reduced while the zero-sequence circulating current of the parallel system is effectively suppressed, the quality ofgrid-connected current is improved, and the method is very suitable for a three-level inverter system operating in parallel.

Description

technical field [0001] The invention relates to the field of NPC inverters, and relates to an inverter circulation suppression method based on model prediction virtual voltage vector control. Background technique [0002] In recent years, my country's photovoltaic and wind power have shown explosive growth. According to the 2018 China Energy Development Report, my country's wind power and photovoltaic installed capacity are 184 million kilowatts and 170 million kilowatts, respectively, ranking first in the world. How to transmit this part of electric energy to the grid with high efficiency, high quality and low cost has become a research hotspot in recent decades. Neutral-point-clamped three-level inverter (Neutral-Point-Clamped, NPC) has the advantages of small output harmonics, high system efficiency, and low switching stress, and is widely used in the field of new energy power generation. However, a single three-level inverter is difficult to meet the application scenari...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/487H02M7/493H02M7/5387
CPCH02M7/48H02M7/487H02M7/493H02M7/53871
Inventor 金涛黄宇升张伟锋
Owner FUZHOU UNIV
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