Distributed bus voltage frequency compensation method suitable for microgrid system

Abstract

The invention discloses a distributed bus voltage frequency compensation method suitable for a microgrid system, and the method comprises the steps: enabling each distributed power generation unit toreceive the active power, active droop coefficient, reactive power and reactive droop coefficient of a former distributed power generation unit, and obtaining a voltage compensation value and a frequency compensation value after the operation of a compensation function; and adding the voltage compensation value and the frequency compensation value into a droop control equation of a main controllerof the distributed power generation unit to compensate the drop of the bus voltage and the frequency. The method has the advantage that the bus voltage and frequency can be recovered to a large extent under the condition that the droop characteristic is not damaged. Meanwhile, the method adopts a one-way annular low-bandwidth communication mode to form a communication layer without a centralizedcontroller, and has the advantages of high reliability, small communication data volume, low bandwidth, strong expansibility and the like.

Description

technical field [0001] The invention relates to the technical fields of distributed power generation and micro-grid, in particular to a distributed bus voltage frequency compensation method suitable for a micro-grid system. Background technique [0002] With the continuous improvement of micro-grid capacity and reliability requirements, the parallel operation of distributed generation units is one of the important ways to solve the demand for high-power electricity consumption. [0003] Droop control is widely used in microgrid control systems without interconnection lines because of its adjustment characteristics of "voltage frequency-active power" and "voltage amplitude-reactive power", so that each distributed generation unit can be adjusted according to its rated capacity Classes allocate active and reactive power to the microgrid system. However, the droop item in the droop control will cause the output voltage and rated value of each distributed generation unit to dev...

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Problems solved by technology

[0010] In view of this, the purpose of the present invention is to provide a distributed bus voltage frequency compensation method suitable for micro-grid systems, to solve the micro-grid systems in the prior art, when the distributed generation unit causes the bus voltage and frequency to drop due to droop control When deviating from the rated value, the voltage and frequency of the bus cannot be restored quickly and efficiently under the premise of ensuring power sharing

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