What are the types of shunt compensation?

What are the types of shunt compensation?

Examples of shunt compensation

• Thyristor-controlled reactor (TCR): reactor is connected in series with a bidirectional thyristor valve.
• Thyristor-switched reactor (TSR): Same as TCR but thyristor is either in zero- or full- conduction.

What is difference between series and shunt compensation?

The main difference between the SVC and STATCON is that in case of SVC the current injected into the system depends upon the system voltage, but in case of STATCON it is independent of system voltage. STATCON generate or absorb reactive power without the use of capacitor or reactors.

What is shunt and series compensation?

In series compensation, the FACTS is connected in series with the power system. It works as a controllable voltage source. To compensate, a shunt capacitor is connected which draws current leading the source voltage. The net result is improvement in power factor.

What are the disadvantages of shunt compensation?

The main disadvantage of shunt capacitor banks is that its reactive power output is proportional to the square of the voltage and consequently when the voltage is low and the system need them most, they are the least efficient.

What are the objectives of shunt compensation?

The ultimate objective of applying reactive shunt compensation in a transmission system is to increase the transmittable power. This may be required to improve the steady-state transmission characteristics as well as the stability of the system.

What are the advantages of shunt compensation?

Shunt compensation using SVCs provides good voltage control along the line and at its terminals and can also result in increased transmission capacity.

What are the problems with series compensation?

Problem associated with Series capacitor The series compensated line produces series resonance at frequencies lower than power frequencies. This is known as sub-synchronous resonance. The sub-synchronous produces mechanical stress due to which high torsional stress occurs in the rotor shaft.

What limits the loading capability?

What Limits the Loading capability? Thermal: Thermal capability of an overhead line is a function of the ambient temperature, wind conditions, condition of the conductor, and ground clearance. It varies perhaps by a factor of 2 to 1 due to the variable environment and the loading history.

Why VAR compensation is usually required?

Shunt Reactive Power Compensation: Since most loads are inductive and consume lagging reactive power, the compensation required is usually supplied by leading reactive power. Shunt compensation of reactive power can be employed either at load level, substation level, or at transmission level.

Why are shunt capacitors used?

Shunt capacitors are an integral part of a power system because it helps in power factor correction. This gadget is known as a shunt capacitor. The shunt capacitor helps balance power transmission issues such as low voltage regulation, poor reliability, and power factors.

What are the objectives of line compensation?

The purpose of series compensation is to cancel part of the series inductive reactance of the line using series capacitors. This helps in (i) increase of maximum power transfer (ii) reduction in power angle for a given amount of power transfer (iii) increased loading.

What are the three main objectives of the load compensation?

The main objectives in load compensation are: Improved voltage profile • Power factor improvement • Balanced load.

What are the benefits of using shunt compensation?

Shunt compensation using SVCs provides good voltage control along the line and at its terminals and can also result in increased transmission capacity. Further benefits arise from the combination of shunt and series compensation, which is likely to be more widely used as transmission companies seek to maximise the utilisation of their assets.

How does series and shunt compensation affect voltage stability?

By artificial injection of reactive power to the loads relieves the transmission network from reactive power flow and improves both the transmission efficiency and operating power factor. But by artificial injection of negative reactance in the lines relieves the lines from excessive voltage drop and improves the voltage regulation.

Why does shunt compensation on EHV transmission line?

During line- charging volt-amperes of a line which have exceeded the inductive vars consumed and operation at light loads, there is an undesirable voltage rises along the line. This voltage rise in turn demands a much higher insulation level, which poses a great problem for the capacitive generator.

Why are synchronous condensers used for shunt compensation?

Active Compensation • Synchronous condensers are the active shunt compensators and have been used to improve the voltage profile and system stability.