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## What happens to frequency when load decreases?

If the torque output by the generator increases, the speed will decrease. When the load of the generator increases, the output torque of the generator must also increase, and the speed will decrease, so that the frequency of power generation will also decrease. This causes frequency to drop.

## How can voltage stability be improved?

Voltage stability improvement and control Reactive power compensation is the most effective method to improve both voltage stability and power transfer capability of the system. The control of voltage bus level is accomplished by controlling the generation, absorption and flow of reactive power.

## What is voltage stability in power system?

Voltage stability is defined as ability of power system to sustain fixed tolerable voltage at every single bus of the network under standard operating conditions as well as after being subjected to a disruption (Kundur, 1994).

## How can voltage collapse be prevented?

Some of the control actions used as counter measures against voltage collapse is as follows:

1. Switching of shunt capacitors.
2. Blocking of tap-changing transformers.
3. Re-dispatch of generation.
4. Rescheduling of generator and pilot bus voltages.
5. Secondary voltage regulation.

## Why does voltage collapse in a power system?

Day by day increase in power demand results in more and more pressurized transmission lines. Such systems are usually subjected to voltage instability and eventually a voltage collapse.

## What is voltage instability?

Voltage Instability is another stability problem that may manifest under heavy loading conditions. This problem causes extremely low voltages. It stems due to the actions of loads to demand power which is beyond the capability of the generators and the transmission network.

## Which of the following is used in reactive power management?

Flexible AC Transmission System (FACTS) technologies are used for reactive power compensation. It is classified as Dynamic shunt compensation and series compensation. Dynamic shunt compensation has the ability to automatically support the voltage level in a specific area of the power system.

## How can we improve the steady state stability of the synchronous generator for a better performance?

Use of high speed circuit breaker will actually increase the system stability. Explanation: High speed CB immediately cuts off the fault and saves the system to undergo transient oscillations.

## What are the major sources of reactive power?

SOURCES OF REACTIVE POWER:

• 1) SYNCHRONOUS GENERATORS:
• 2) SYNCHRONOUS COMPENSATORS:
• 3) CAPACITIVE AND INDUCTIVE COMPENSATORS:
• 4) OVERHEAD LINES AND UNDERGROUND CABLES:
• 5) TRANSFORMERS: