Adjusted micro-grid DC/DC convertor grid-connected control device and control method based on drooping characteristics

Abstract

The invention provides an adjusted micro-grid DC / DC convertor grid-connected control device and control method based on drooping characteristics. The output quantity of DC / DC convertor electric current loops serves as the adjustment amount of the main component of voltage loop command signals; in electric current closed loop control, command signals of an electric current loop controller come from a micro-grid upper layer energy management system or are generated by the maximum power tracing module in a distributed power generation system control software; the main component of command signals of a voltage loop controller is obtained through calculation of the actual output current according to the drooping characteristics of the preset DC / DC convertor; the PWM modulating control signal is obtained through the amplitude limiting processing of the positive saturated amplitude limiting link on the synthetic command signals of the voltage loop controller and the calculation of the voltage controller according to the command signals and the feedback actual micro-grid busbar voltage deviation. A plurality of distributed power generation systems can run at own possible best operating points and can realize stable parallel output according to own available power.

Description

technical field [0001] The present invention relates to a DC micro-grid distributed generation grid-connected control device and control method, specifically a method for adjusting the droop characteristics of a DC / DC converter in a DC micro-grid to integrate a distributed power generation system The double-closed-loop grid-connected control technology that integrates the electric energy into the microgrid. Background technique [0002] Distributed power generation systems may include solar photovoltaic power generation systems, wind power generation systems, ocean tidal current power generation systems, etc. Under the condition of DC microgrid, these power generation will transmit DC power to the microgrid busbar through DC / DC converter. Because the design capacity of these power generation systems is different, even if the capacity is the same, at the same time, affected by the control (operation) mode, weather and environmental factors, the output power of each power gen...

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Problems solved by technology

[0003] At the same time, in order to obtain more electric energy from nature, each power generation system may set a maximum power capture (MPPT, Maximum Power Point Tracking) algorithm according to its actual situation. source) to inject energy into the microgrid bus, in the independent microgrid mode, if no appropriate control measures are taken, it will cause fluctuations in the DC microgrid bus voltage, which may endanger the stable operation of the entire microgrid system

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