Voltage source inverter control method for decoupling electric current in virtual synchronous coordinate system

Abstract

The invention discloses a voltage source inverter control method for decoupling electric current in a virtual synchronous coordinate system. The method comprises the step of conducting error PI adjustment and decoupling compensation calculation on dq axis current outputted by an inverter in a virtual synchronous rotating coordinate system, so that an AC output voltage command can be directly generated. The control method disclosed by the invention can eliminate a phase-locked loop link aiming at detecting the phase and the frequency of the rotating vector of grid voltage, and has obvious self-adaptability to frequency deviation; and furthermore, the control method can also be used for supplement and extension of a vector control method based on grid voltage orientation under the condition of deviation of voltage phase and frequency detection. According to the voltage source inverter control method, a grid voltage phase-locked loop is eliminated, the control design of a voltage source inverter is simplified, and the system computing burden and the realization complexity are reduced.

Description

Technical field [0001] The invention belongs to the technical field of voltage source inverter control, and specifically relates to a voltage source inverter control method with virtual synchronous coordinate system current decoupling. Background technique [0002] At present, voltage source inverters, as the key interface equipment for renewable energy distributed power generation access to the grid, have received extensive attention and attention in the field of renewable energy distributed power generation due to their high efficiency, low cost, and ease of integration. A large number of applications. According to the "Twelfth Five-Year Plan for Energy Development" issued by the State Council, my country will actively promote the development of distributed renewable energy in accordance with the basic principles of "self-use, surplus Internet access, local conditions, and orderly advancement". It is planned to be by the end of 2015. , The installed capacity of distributed phot...

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Problems solved by technology

Then, the control scheme is highly dependent on the accuracy of the phase angle obtained by the phase-locked loop, and in order to detect real-time phase angle information quickly and accurately, it is necessary to improve the phase-locked loop, which also increases the complexity of the system design and computational burden

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