Three-phase photovoltaic grid-connected inverter control device
A control device and inverter technology, applied in the field of solar power generation, can solve the problems of non-compliance with standards, inconsistent voltage or current data, and large total harmonic distortion rate of output current of a solar grid-connected inverter system.
Inactive Publication Date: 2015-08-05
周皓 +1
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Problems solved by technology
In the sensorless control technology mentioned in the above-mentioned documents and patents, the corresponding voltage and current are basically predicted by collecting other related voltages and currents, but sampling noise interference and filter circuits will bring The collected voltage or current data does not match the actual ones. This difference will lead to a large total harmonic distortion (THD) of the output current of the solar grid-connected inverter system and may even fail to meet the standard requirements (international and Chinese Specified THD less than 5%)
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[0066] In order to make those skilled in the art better understand the technical solutions of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0067] figure 1 It is a circuit diagram of a standard three-phase voltage-type inverter, which is connected to a three-phase point network through the output filter reactor, thus forming a three-phase grid-connected voltage-type inverter, on the three-phase static a-b-c reference coordinate system , the state space equation of the system is expressed as:
[0068] d d t i a i b i c ...
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The invention relates to the technical field of solar power generation, and particularly to a three-phase photovoltaic grid-connected inverter control device without an intermediate loop voltage sensor, wherein controlling for the three-phase photovoltaic grid-connected inverter without the intermediate loop voltage sensor is realized through predicting the voltage of an intermediate loop. The control device of the invention comprises the following units: an electric grid phase voltage detection unit; an electric grid phase detection unit; a three-phase / two-phase rotating coordinate conversion unit; a current and voltage prediction unit; a current error compensation prediction unit; an intermediate loop voltage prediction unit; and a space voltage vector PWM modulation unit. The three-phase photovoltaic grid-connected inverter control device has advantages of reducing an intermediate loop voltage sensor which is commonly used in the three-phase photovoltaic grid-connected inverter, and greatly improving current output quality, dynamic performance and steady-state performance of a system.
Description
technical field [0001] The invention relates to the technical field of solar power generation, and more particularly, to a three-phase photovoltaic grid-connected inverter control device without an intermediate circuit voltage sensor. Background technique [0002] In a three-phase photovoltaic grid-connected power generation system, the quality of the output current is an important indicator to measure a three-phase photovoltaic grid-connected power generation system. Generally, the quality of the output current is usually measured by the total harmonic distortion (THD). The international standard IEEE1547 has an upper limit on the output current THD value of the grid-connected inverter in the solar power generation system, that is, the THD value must be less than 5%, otherwise the system device will cause great "pollution" to the power grid. Referring to international standards, China and other countries have developed similar standards. Generally, the smaller the THD valu...
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IPC IPC(8): H02J3/38H02M7/5395H02M7/5387
Inventor 周皓李维刚
Owner 周皓