Capacitor overcompensation increases reactive power

Why is capacitive reactive power balanced?

When the capacitive reactive power starts increasing, i.e. in case of overcompensation, the thyristors of the TCR are turned on by getting a signal from reactive power monitor. Therefore capacitive reactive power is balanced . The waveform of active and reactive power and power factor is given in Figure 7.

Can capacitive reactive power be used to regulate voltage?

This article presents an efficient voltage regulation method using capacitive reactive power. Simultaneous operation of photovoltaic power systems with the local grids induces voltage instabilities in the distribution lines. These voltage fluctuations cross the allowable limits on several occasions and cause economic losses.

How to compensate for reactive current caused by EMI capacitor?

There is a novel method to actively compensate for the reactive current caused by the EMI capacitor. Moreover, the PFC current-loop reference is reshaped at the AC zero-crossing to accommodate for the fact that any reverse current will be blocked by the diode bridge. Both PF and THD are improved as a result. Figure 3.

What type of capacitor is used for reactive power compensation?

In the past, rotating synchronous condensers and fixed or mechanically switched inductors or capacitors have been used for reactive power compensation. Today, static Var generators employ thyristor-switched capacitors and thyristor-controlled reactors to provide reactive power compensation.

When should a capacitor be sized to overcompensate a motor?

The recommended practice is to size the capacitor to around 80% of the reactive power demand at no load condition. Overcompensation of motors is often is not intentional and usually happens when motors are relocated to a new starter location or when swapping motors with different magnetizing characteristics.

Should reactive power compensation be applied for a shorter time?

The measured data shows good agreement with the calculated one, verifying the correctness and accuracy of the proposed method. It is recommended that the reactive power compensation can be applied for a shorter time because the source current enhances substantially as the capacitance is connected to the load.