Dynamic Reactive Power Compensation

What is a combined reactive power compensation device?

In this paper, a combined reactive power compensation device was installed, which is composed of a static var generator (SVG) and a parallel capacitor bank. The SVG has the characteristics of fast and smooth adjustment, and the application of the capacitor bank reduces the overall investment cost and has a great economy.

What is a parallel active power compensator (APC)?

Parallel Active Power Compensators (APC) seem to have been a very widely discussed matter of many publications in the last 20 years [ 1 – 7 ]. The features of these devices can be considered in respect to a few aspects, such as power stage structure, reference current calculation and control method, overall cost of application, number of functions.

What are the disadvantages of a parallel active compensator?

Voltage mode parallel active compensators have one significant disadvantage: the power factor depends on the load's active power and line voltage. This causes PF deterioration, especially in the case of line voltage dips and swells (although the load voltage in PCC still is stable).

Can synchronous compensators compensate reactive power?

Instead of using capacitor banks, there is a different alternative to compensate the reactive power that is based on the use of synchronous compensators. These are synchronous machines that, operating with null active power, can behave either as variable capacitors or coils, by simply changing their excitation current .

What is a capacitor bank?

1. Capacitor Banks: Capacitor banks are systems that contain several capacitors used to store energy and generate reactive power. Capacitor banks might be connected in a delta connection or a star (wye) connection. Power capacitors are rated by the amount of reactive power they can generate. The rating used for the power of capacitors is KVAR.

What happens if there is no reactive power compensation device?

Program 1: In the case that there is no reactive power compensation device in either wind farm when the active power is about 385 MW, the busbar voltage drops rapidly and quickly reaches the limit instability point. Program 2: When the SC-type capacitor bank is put in, it leads to a large oscillation of the wind turbine terminal voltage.