OLTC Control Systems - Topology - Engineering Assignment Help

Assignment Task:

Topology 3 corresponds to the conventional voltage regulators that are utilized in the grid. It consists of an autotransformer with taps on the series winding at the secondary side. A selector switch connects either the top or the bottom of the series winding LV side to the primary HV side so as to provide negative or positive compensation respectively.

• In an attempt to use a single transformer for compensation that is rated only for the compensating power of 0.1p.u., topology 7 is obtained. They use a step-down type center-tapped series transformer. The transformers have a turn ratio of 100:1 and 20:1 respectively. 
• In topology 7, the taps are moved to the secondary side - the benefit being that the switch voltage ratings in OFF condition are reduced. The drawback of this design is that the tap switches directly carry the load current and are not isolated from the source or load. A selector switch determines the polarity of the compensation voltage. The series transformer primary and secondary is rated for 2p.u. and 0.1p.u voltage respectively. To evaluate the ratings of the switches - when one tap is ON, say S1 providing 10% compensation, the other switches will have to block up to 0.1p.u voltage. The selector switch has to block ±2 p.u.

NOTE::
ALL THE RESULT (GRAPH OR FIGURE) MUST HAVE EXPLANATION.  THE MAIN REASON OF THIS PROJECT IS TO COMPARE BOTH TOPOLOGY 3 AND 7. 
Objective

• To develop OLTC control systems that can help maintain the grid voltage within the standard levels using the latest technologies.
• To evaluate the performance of the proposed system in terms of energy-saving while the power quality is not violated.

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