Volvo Diesel Generator Fully Automatic Control System

Firstly, we analyze the speed regulation (active frequency control) system, using the rated power fN of the synchronous generator as the reference value. When the active power of the downstream load increases to Pred, the output frequency of the synchronous generator drops to the new stable value of fref. The slope of section AB is the static adjustment coefficient mp of the synchronous generator, Δ F=fref fn, Δ P=PN Red. When Volvo diesel generator sets operate in parallel, each generator dynamically adjusts its frequency and power until all load requirements are met. If the capacity of each generator unit is the same, the static adjustment coefficient is also the same, and the output power is naturally the same; If the unit capacity is different, the static adjustment coefficient of units with larger single unit capacity is larger, and Volvo diesel generator set naturally bear more downstream loads.

Secondly, we analyze the voltage regulation (reactive voltage control) system. Similarly, the slope of the CD segment is called the reactive voltage droop control coefficient nq of the synchronous generator, which reflects the relationship between the reactive power increment of the generator unit and the terminal voltage deviation Δ U=Uref UN, Δ Q=QN Qred. It can be seen from the control block diagram of synchronous generator excitation power unit that the reference voltage is calculated through the measurement link and the difference adjustment link, and then compared with the generator terminal voltage (where the voltage regulator is PI controlled), so that the generator terminal voltage always quickly tracks the voltage command.

Finally, there is droop control. In order to ensure the stability of parallel operation of diesel generator sets, stable frequency and voltage are obtained through P/f droop control and Q/V droop control, respectively. This control method controls the active and reactive power output of each Volvo diesel generator set separately, without the need for communication and coordination between each Volvo diesel generator set, achieving equal control between each Volvo diesel generator set, This ensures the supply and demand balance and frequency stability of the parallel system of Volvo diesel generator sets. The droop control adopts a voltage and current dual loop control, with a fast dynamic response speed in the current inner loop, which is used to improve the power quality of Volvo diesel generator sets. The voltage outer loop controller has a slow dynamic response speed, which can control the output voltage of the system and generate an inner loop reference signal.

Dingbo Power has advanced testing equipment, modern production technology, professional manufacturing technology, perfect quality management system, and strong technical research and development capabilities. It can provide 3KW～2500KW various specifications of ordinary, automatic, four protection, automatic switching, low noise and mobile generator sets, high quality and low energy consumption to meet the diverse power needs of customers, and can also meet users with different voltages and different frequencies. It is required to create a parallel power supply system for multiple units. If you are interested in our product or any question on generator, welcome to send email to sales@dieselgeneratortech.com.