Frequency control
<h2><strong>Frequency control</strong></h2>
<p>Synchronous generators in power stations spin at around 50 cycles per second. This speed is referred to as “frequency” (denoted Hertz, symbol Hz). Controlling this constant frequency is essential for maintaining reliability.</p>
<p>If there is loss of generation somewhere, extra power is drawn through the electricity network from other plants. This causes these generators’ rotors to slow down and the system frequency to fall. A key parameter is the so-called “maximum rate of change of frequency”. The faster the frequency changes, the less time is available to take corrective action.</p>
<p> </p>
<p>A power generating system has the responsibility to ensure that adequate power is delivered to the load, both reliably and economically.</p>
<p>The quality of power supply is affected due to continuous and random changes in load during the operation of the power system. Hence, a power system control is required to maintain a continuous balance between power generation and load demand.</p>
<p><strong><em>Load Frequency Controller</em></strong> and <em><strong>Automatic Voltage Regulator </strong></em>play an important role in maintaining constant frequency and voltage in order to ensure the reliability of electric power.</p>
<p> </p>