implementation of statcom and reactive power compensation

IMPLEMENTATION OF STATCOM

PROJECTEES- NISHANT SINGH KAMAL KANT YADAVPRASHANT SHEKHAR SHAILESH SINGHProject Guide :Manish

Pathak

Today · changing electric power systems create a growing need for Reliability, flexibility, fast response and accuracy.

Flexible Alternating Current Transmission Systems are new devices emanating from recent innovative technologies that are maintain altering voltage phase angle

Objective

Electrical Power

In this we are compensating the Reactive power

A. Active Power

B. Reactive Power

C. Apparent Power

Reactive power

What is Reactive power.

Need

Importance

Purpose

Sources

In power system, real power and reactive power is controlled by the voltage and phase angle difference between the sending end and receiving end respectively. Impedance of the transmission line can also be used to control real and reactive power. Flexible AC Transmission Systems (FACTS) are used to improve the power transfer capability of transmission line.

EXISTING SYSTEM

THYRISTOR CONTROL REACTOR THYRISTOR SWITCHED CAPACITOR STATIC VAR COMPENSATOR THYRISTOR SWITCHED

SERIESCOMPENSATOR STATIC COMPENSATOR SELF COMMUTATED COMPENSATOR UNIFIED POWER FLOW CONTROLLER

Different fact devices

INCREASE THE CAPABILITY OF LOADING OF LINES TO THEIR THERMAL CAPABILITES

INCREASE THE SYSTEM SECURITY THROUGH RISING THEIR TRANSIENT STABILITY LIMIT CONTROL OF POWER FLOW AS ORDERED REDUCE REACTIVE POWER FLOW

Benefits of devices

Static synchronous compensator, is a regulating device used on ac current electricity transmission networks. It is based on a power electronics voltage-source converter and can act as either a source or sink of reactive AC power  to an electricity network. If connected to a source of power it can also provide active AC power It is a member of the FACTS family of devices.

Static Synchronous CompensatorStatcom

Structure of Statcom

STATCOM (Static Synchronous Compensator)

Single line diagram ofreactive power comp. using statcom

Components mainly used are :

Coupling Transformer

Voltage source converter

Capacitor bank

STATCOM controller

OPERATING PRINCIPLE

SIMULATION CIRCUIT

Statcom waveform

Svc waveform

14-Bus System without statcom

Current and voltage Waveform(without statcom)

14 –Bus System with statcom

Current and voltage waveform(with statcom)

Summary of reactive power in various buses

Statcom in Wind Power Plant

Statcom with PI Controller

Statcom with Fuzzy Logic

DRAWBACK OF THE PROPOSED CONTROL STRATEGY HARMONIC COMPENSATION IS NOT

ACHIEVED

PRESENCE OF FOUR PI CONTROLLERS MAKES THE SYSTEM SLOW IN RESPONSE

IT ALSO REDUSES THE STABILITY

CONTINUOUS AND DYNAMIC VOLTAGECONTROL HIGH EFFICIENCY HIGH DYNAMIC VERY FAST RESPONSE TIME SINGLE PHASE CONTROL FOR UNBALANCED

LOADS REACTIVE POWER COMPENSATION

Main Advantages

The static synchronous compensator (STATCOM) is increasingly popular in power system application. In general, power factor and stability of the utility system can be improved by STATCOM.

Statcom is able to provide rated current under reduced voltage condition

Why this device is used

Voltage support and control Voltage fluctuation and flicker mitigation Unsymmetrical load balancing Power factor correction Active harmonics cancellation Improve transient stability of the power

system

Continue….!

The STATCOM has the ability to provide more capacitive reactive power during faults, or when the system voltage drops abnormally, compared to ordinary static var compensator. This is because the maximum capacitive reactive power generated by a STATCOM decreases linearly with system voltage, while that of the SVC is proportional to the square of the voltage. Also, the STATCOM has a faster response as it has no time delay associated with thyristor firing.

Statcom vs. SVC

33

comparison

www.8051.in

COMPARISON OF VI CHARACTERISTICS OF SVC AND

STATCOM

Ultra dynamic response (<10ms) No steps Ind. + cap. Capabilities Low harmonics no filters required Cheaper than SVC below §50MVAR

Characteristics of Statcom

Future work can involve multilevel STATACOM to reduce harmonics in the system.Also more practical sophisticated method may be proposed to adress the minimization of STATCOM capacity.

STATCOM can be implemented with Predictive Controller.

Future Work

37

25