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A Calculation Method for Harmonic Suppression of DC Bus Voltage

A technology of DC bus voltage and calculation method, which can be applied to DC circuits to reduce harmonics/ripples, AC network circuits, photovoltaic power generation, etc. Wave content, the effect of improving the quality of output current

Inactive Publication Date: 2017-01-18
HUZHOU TEACHERS COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

These solutions need to increase the number of capacitors or improve the withstand voltage level of capacitors, which will lead to increased hardware costs

Method used

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  • A Calculation Method for Harmonic Suppression of DC Bus Voltage
  • A Calculation Method for Harmonic Suppression of DC Bus Voltage
  • A Calculation Method for Harmonic Suppression of DC Bus Voltage

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Experimental program
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Embodiment 1

[0028] according to figure 1 As shown, when the voltage loop controller is at t 1 When the time starts to calculate, the feedback voltage input to the voltage loop controller is t 0 Voltage sampling value at time V bus_t0 and t 1 Voltage sampling value at time V bus_t1 the average value of Similarly, when the voltage loop controller is at t 2 When the time starts to calculate, the feedback voltage input to the voltage loop controller is When the voltage loop controller is at t 3 When the time starts to calculate, the feedback voltage input to the voltage loop controller is ......; when the voltage loop controller is at t k When the time starts to calculate, the feedback voltage input to the voltage loop controller is That is to say, the feedback voltage input to the voltage loop controller at the current moment is the average value of the sampled value of the DC bus voltage in the previous cycle and the sampled value of the DC bus voltage at the current moment. T...

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Abstract

The invention belongs to a single-phase photovoltaic grid-connected inverter control algorithm, and relates to a direct-current bus voltage harmonic suppression calculating method. By the control algorithm, a direct-current bus voltage sampling period and a voltage ring controller calculating period are adjusted and a corresponding relation of the direct-current bus voltage sampling period, the voltage ring controller calculating period and a mains supply voltage period is established to average sampling values of adjacent moments according to the characteristic of periodicity of second harmonics of the voltage of a direct-current bus, so that an accurate direct-current component of the voltage of the direct-current bus can be obtained, interferences of second harmonics on a voltage ring controller in the traditional direct-current bus voltage sampling method can be avoided effectively, the content of tertiary harmonics in a current reference of a current ring is greatly reduced, and the quality of the outputted current of a grid-connected inverter is improved.

Description

technical field [0001] The invention relates to a method for calculating harmonic suppression of DC bus voltage, which is suitable for single-phase photovoltaic grid-connected inverters. Background technique [0002] Solar energy belongs to green energy, and energy can be transmitted to the grid through solar photovoltaic power generation systems. At present, more and more household single-phase grid-connected inverters are connected to the grid. For household single-phase photovoltaic grid-connected inverters, the instantaneous power input from the photovoltaic panels to the DC bus capacitor of the inverter is DC flow, and the instantaneous power output from the bus capacitor to the grid is DC component and double frequency The superposition value of the AC component, so for the DC bus voltage, the second voltage harmonic inevitably exists, and the amplitude of the harmonic voltage increases with the increase of the output power of the inverter. [0003] Grid-connected inv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/02
CPCH02J1/02H02J3/383Y02E10/56
Inventor 郭晓瑞
Owner HUZHOU TEACHERS COLLEGE
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