Inverter control method
A control method and inverter technology, applied in the direction of converting AC power input to DC power output, output power conversion device, electrical components, etc., can solve difficult networking, provide stable voltage and frequency support without load, and have no Questions such as being clearly raised to achieve the effect of facilitating networking
Inactive Publication Date: 2014-12-10
BEIJING JIAOTONG UNIV
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[0004] However, the technical requirements for the above-mentioned distributed power sources are as follows: on the one hand, although some renewable energy power generation inverters have MPPT functions, they are usually current source output characteristics, and it is difficult to form a network when running off-grid, and cannot provide stable power for the load. Voltage and frequency support; on the other hand, some distributed power inverters with off-grid stable operation function do not have MPPT function, and cannot realize the effective use of renewable energy
The inverter control mode with both MPPT and voltage source output characteristics has not been clearly proposed at present
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[0026] In the present invention, the structure of the power generating device is as figure 1 As shown, it includes a renewable energy power generation device 1 , a power conversion unit 3 , an inverter control unit 4 , an MPPT control unit 5 and a voltage and current detection unit 6 . The renewable energy power generation device 1 is connected to the grid 2 through the power conversion unit 3, and the inverter control unit 4 and the MPPT control unit 5 use the data feedback variables and control reference variables output by the voltage and current detection unit 6 to make corresponding logical judgments and data processing, and finally the PWM control signal output by the inverter control unit 4 controls the switching states of the semiconductor power devices in the power conversion unit 3 .
[0027] By introducing the droop characteristic control mode, the external characteristics of the voltage source output of the power conversion unit 3 meet the droop characteristic curv...
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The invention discloses an inverter control method. By the method, an inverter has maximum power point tracking (MPPT) capability while the voltage source output characteristic of the inverter is ensured. By a control method of introducing a droop characteristic into inverter control, the inverter has the function of controlling output power which accords with a droop characteristic curve on the basis of having the voltage source characteristic output. For an MPPT inverter output power adjusting instruction, the inverter responds to the output power adjusting instruction in a mode that the droop characteristic curve is vertically translated, so that the output characteristic of the inverter has voltage source output characteristic and MPPT functions, and an effective distributed power supply application scheme is provided for various renewable energy sources with energy intermittence; therefore, the application of the renewable energy sources to a distributed power supply is expanded.
Description
technical field [0001] The invention relates to an inverter control method, which belongs to the field of power electronic device control. Background technique [0002] Compared with the existing centralized grid structure of power generation, transmission and distribution, installing small distributed power sources in the distribution network can not only reduce the physical and electrical distance between power generation equipment and loads, reduce transmission loss, but also Delay investment in large distribution grids and generating units. Especially after the distributed power supply has the "plug and play" function, it further promotes the development mode of installing and using the distributed power supply for a specific load. At the same time, when the distributed power supply has the function of off-grid operation, even in the case of a grid failure, the distributed power supply can still form an independently operating grid to provide stable voltage support and ...
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IPC IPC(8): H02M7/00
Inventor 黄杏金新民马添翼
Owner BEIJING JIAOTONG UNIV