Common ways of reactive power compensation - Database & Sql Blog Articles

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Overview

Provisions for increasing power factor for electrical loads

The "Power Supply Business Rules" stipulates that the power factor of high voltage users of 100kvA and above should be above 0.90; the power factor of other power users, as well as large and medium-sized power irrigation and drainage stations should be above 0.85; the power factor of agricultural power is above 0.80. Below, Xiaobian will introduce to you

The method of reactive power compensation.

Synchronous generator

The synchronous generator of the power plant is both an active power source and the most basic reactive power source.

Synchronous generator operation outputs reactive power to the system when the power factor is below 1. The lower the power factor, the more reactive the output is, and the greater the excitation current required by the generator. Since the excitation current of the generator is not allowed to exceed the rated value, the reactive power that the synchronous generator can provide is also limited. Moreover, when the generator is operating below the rated power factor, the active power that can be supplied is correspondingly reduced due to the fact that the stator current is not allowed to exceed the rated value.

Camera

The camera is essentially a generator that can only generate reactive power and cannot send active power. It supplies inductive reactive power to the system during overexcitation. In addition to the reactive power, the camera can also be used as a reactive power source and consume reactive power. Reactive power is drawn from the system when the camera is under-excited. The advantage of adjusting the camera is that it is very convenient to adjust the reactive load size, as long as the excitation current is changed. However, the camera is a rotating motor, which has a large investment in infrastructure, complicated operation and maintenance, and high cost. Moreover, the camera itself consumes a part of the power. With the improvement of power container manufacturing technology and the increase in usage, the current camera has been rarely used.

Parallel capacitors. When the power capacitor is put into the system, it flows through a lead voltage of 90° capacitive load current, which is the same as the reactive power output from the generator or the camera to the system. Since the power capacitor is a static electric appliance and has no rotating equipment, the installation is simple, the operation and maintenance workload is extremely small, no noise, and the active power consumption is extremely small. Therefore, the power capacitor is an excellent reactive power source.

Capacitor compensation reactive power is generally used in parallel with powered devices, so it is called shunt capacitor. The capacitive load current of the associated capacitor compensates with the inductive load current of the powered device, so that the inductive reactive current in the power supply side line is reduced, thereby functioning as a reactive power compensation.