Before taking in the strategies for voltage control in power framework, we should first comprehend for what reason do we have to control voltage. In power frameworks, the voltage should be consistent which is clearly not. So we need to control it such that it stays consistent. However, for what reason does the voltage should be consistent by any means?
Since, the greater part of the gadgets, device, electrical machines, shopper apparatuses and so on are altogether intended to work at a predetermined voltage. Wide varieties of voltage may cause mistakes in activity, breaking down or execution crumbling.
It is attractive that the shoppers get control at generously consistent voltage. In numerous nations, including India, the statutory furthest reaches of voltage variety is ±6% of the announced voltage at shoppers’ end.
Subsequently, it is imperative to apply certain procedures, certain strategies to control the power framework voltage to keep it steady. Following are the techniques for voltage control in control framework.
Techniques for Voltage Control in Power System
Using Induction Voltage Regulators
An enlistment controller is fundamentally an electrical machine to some degree like an acceptance engine, aside from that the rotor isn’t permitted to turn constantly. The rotor of acceptance controller holds essential (excitation) winding which is associated crosswise over (parallel) the supply voltage.
The stationary optional winding is associated in arrangement with the line which is to be controlled. From an electrical perspective, it is irrelevant whether essential winding is pivoting or optional winding is turning.
The extent of voltage in the optional twisting relies on its situation as for the essential winding. Along these lines, the optional voltage can be balanced by pivoting the essential winding. Enlistment voltage controllers were utilized to control voltage of electrical system in prior days, however, they are presently supplanted by tap evolving transformers.
Voltage Control by Using Shunt Reactors
Shunt reactors are fundamentally inductive components that are given at sending end and accepting the end of long EHV and UHV transmission lines. At the point when a transmission line isn’t stacked or delicately stacked, the line capacitance prevails and getting end voltage winds up more prominent than the sending end voltage.
This impact is known as Ferranti impact. In such circumstance, shunt reactors are exchanged in the line. Shunt reactors remunerate the line capacitance and, subsequently, control the voltage.
Voltage Control by Using Shunt Capacitors
Shunt capacitors are normally introduced at the less than desirable end substations or close modern burdens. A large portion of the modern burdens draw inductive current and in this way the power factor is slacking (normally 0.3 to 0.6 slack).
The line encounters IXL drop because of this slacking current. Exchanging in shunt capacitors remunerate this inductive reactance, accordingly, diminishing the IXL drop. Therefore, shunt capacitors can be utilized to control the line voltage when the heap is very inductive.