INTRODUCTION

(STATic  Synchronous  COMpensator), also known as SVG (Static Var Generator)  

 
Sinopak STATCOM is a chain-type static synchronous compensator (STATCOM/DSTATCOM, also knows as SVG) —active dynamic reactive and harmonic compensation device at different compensation ranges. One STATCOM enables grid code compliance from HV Incoming Busbar directly.

SVG, different from impedance compensation (injecting or absorbing reactive power by capacitor and reactor) theory of traditional SVC, is based on voltage source converter, whose theory is equivalent to static synchronous condenser but whose performance is better than that of condenser and SVC. Especially, its operation range is wide, and its reactive compensation under low voltage(LVRT) is far greater than that of SVC.

OPERATION PRINCIPLE

The Static Synchronous Compensator is a voltage regulating device based on voltage source converters (IGBTs). It acts as a source or a sink of reactive power which is independent of ac system voltage. STATCOM can operate as a part of Flexible AC Transmission    System (FACTS) to detect and compensate voltage fluctuations or flickers instantly, correct unbalanced loads and control power factor. 

Sinopak STATCOM Topology H-Bridge Cascading Scheme

The cascading scheme is a multi-level topology that consists of many H-bridge power units with monopole multiplier modulation to achieve three-level output on AC side. Each phase adopts the carrier phase modulation method to obtain better voltage output waveform with much more level numbers. The cascading scheme can output phase voltage　　　　　　　　　　　　　　　　　　　　　

with 2N +1 levels if each phase comprises N +1 chain (i.e. the H-bridge power unit).　

This topology can be used in two connection schemes: Delta connection and Star connection:

Star connection

Delta connection

TECHNICAL SPECIFICATIONS