Photovoltaic three-phase grid control method for fast and steadily implementing maximal power tracing |
Title： |
| Photovoltaic three-phase grid control method for fast and steadily implementing maximal power tracing |
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Application Number： |
200710100324 |
Application Date： |
2007/06/08 |
Announcement Date： |
2008/02/06 |
Pub. Date： |
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Publication Number： |
101119031 |
Announcement Number： |
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Grant Date： |
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Granted Pub. Date： |
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ApplicationType： |
Invention |
State/Country： |
11[China|beijing] |
IPC： |
H02J 3/38G05F 1/67 |
Applicant(s)： |
Tsinghua University |
Inventor(s)： |
Zhou Dejia, Zhao Zhengming, Zhao Zhiqiang, Feng Bo, Zhao Jing |
Key Words： |
Photovoltaic, three-phase, control method, maximal power tracing |
Abstract： |
The present invention relates to a photovoltaic three phase synchronization control method realizing maximum power tracking swiftly and stably, which belongs to the technical field photovoltaic power generating control. The method includes the steps as follows: judging the DeltaP/DeltaV value according to the power difference DeltaP between the current time k and the previous time and the voltage difference DeltaV; working out the Iref(k) when the photovoltaic array produces the maximum power; using the Iref(k) to adjust the uq* under the coordinates in vectorial synchronous rotation with the electric network voltage; acquiring six ways of space vectorial SVPWM impulse series according to the rotation angle degree Theta of the three phase electric network voltage, with the aim to control the inverter in order to ensure that the output current of the photovoltaic inverter has the same phase position as that of the mains voltage while ensuring the photovoltaic array is realizing the maximum power output tracking. The power factor is 1. The present invention also can adjust the Idref(k) according to local load requirements, therefore achieving adjustment to the power factor, with low synchronization current harmonic wave distortion factor. |
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