Static Var Compensator (SVC) STATCOM


A Static Var Compensator (SVC) is a fast-acting power electronic device used for dynamic control of voltage in a local area or at an interface point.  An SVC can provide a continuously variable reactive power range using TCRs, with coarser reactive control provided by TSRs and TSCs. The reactive power (MVAr) output of the SVC can be configured for direct or automatic voltage control.

Features include:

  • Stabilise voltage in a weak system
  • Reduce transmission losses
  • Enhance transmission capability and make existing grid more efficient
  • Improve transient stability
  • Enhance voltage control and stability
  • Mitigate power oscillation
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    • Static Var Compensator’s are part of the Flexible AC Transmission System (FACTS) genre of equipment. They provide variable inductive and capacitive reactive power using a combination of thyristor controlled reactors (TCR), thyristor switched reactors (TSR) and thyristor switched capacitors (TSC). These are connected to the AC network using a compensator transformer or via a transformer tertiary winding.


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Static VAR Compensator

With all things in business and industry, technology offers many solutions that enable us to get the best from our systems, and continually shows us new ways to unearth data that can be analysed and used to make our processes that bit more efficient and effective. Energy and its uses are a key part of the industries that we at CSE Uniserve cater to and among the products we supply is the static VAR compensator.

A Static VAR Compensator improves system stability and system power factor. There are no rotating parts and the firing angle of the thyristor controls voltage and current flow, and as such enables control of the power draw by the inductor. In addition to this, there are a number of other advantages, which include:

  • Controls temporary over-voltages and steady state
  • Reductions in line losses lead to improved system capabilities as a result of an improvement to the load power factor
  • Transmission lines are given increased power transmission capabilities
  • The system transient stability is greatly improved

At CSE Uniserve, our goal is to source the best products on the market and supply them all under our banner, while simultaneously offering innovative design and manufacture solutions tailored to the specific needs of our customers.

A network of possibilities

At CSE Uniserve, we have been working for Australian industry for over 35 years and in that time have expanded our operations significantly across the country.  As part of the CSE Global brand we have the advantages of knowledge, expertise and know-how resulting from our presence in 20 countries.

Our ability to solve problems drives us more than ever and so, as leaders in our field, we are determined to create mutually beneficial relationships with other bodies that support what we stand for. Among our associations you will find:

  • La Camara the Spanish-Australian Chamber of Commerce
  • Austmine
  • CIGRE, the Council on Large Electric Systems
  • The Mining and Energy Services Council of Australia (MESCA)
  • The University of Technology Sydney

Keep your power supply steady with a static VAR compensator

Every large industrial level plant will benefit from installation of static VAR compensator technology. This is a piece of equipment designed to manage and stabilise voltage, for mitigation against power oscillation and other common problems involving power input and output.

With SVC technology in place, your entire internal power grid becomes more efficient and reliable. More importantly, it helps protect your sensitive electrical machinery and electronics from power problems. Reducing system failures means reducing lost productivity, so it’s definitely good for business.

Example of the static VAR compensator in operation

At the heart of the SVC system is a component called a thyristor controlled reactor (TCR). Near high voltage equipment, you may have noticed a hum or whine that is associated with high voltages.

This sound is due to oscillation of the alternating current, and a related phenomenon known as magnetostriction. In electrical engineering terms, the entire effect is bracketed under the concept of harmonics, and the problem with harmonics is they bleed energy and increase temperature of the components.

One of the main purposes of the TCR is to eliminate the lost energy caused by harmonics and stabilize the voltage, smoothing out the peaks and troughs. Another purpose of the TCR is to help protect your grid system from surges and brownouts, even in the event of lightning strikes.

The TCR uses electrical valves to filter the incoming voltage, allowing only the correct amount to pass through. These valves are created by pairs of thyristors connected in inverse parallel formation. This is necessary due to the characteristics of AC circuits, and the unidirectional structure of the thyristor.

As the current moves between the pairs of thyristors in the TCR circuit, it has a damping effect. When the thyristors are arranged appropriately, the harmonics are trapped in the TCR and do not escape into the rest of the grid.

CSE Uniserve makes substation management simpler

The need for reliable three phase AC power in heavy industry means big business consumers need to invest a lot in their substation infrastructure. CSE Uniserve are your local expert engineering partners in Australia, able to supply the latest in electrical engineering technology, so your power grid system can operate at maximum efficiency and will be easier to manage.

Our static VAR compensators are just one of many innovations we provide in support of achieving this goal, but for those clients with high energy demands, the static VAR compensator is a vital component of the system.

Other products we supply to assist include:

This is only a partial list of the many products and engineering assistance you can obtain through CSE Uniserve.

Commitment to Quality

When it comes to quality assurance in our business, at CSE Uniserve the AS/NZS ISO9001:2015 standard for Quality Management Systems guides and governs our Integrated Management System, and ensures that all of our operations both locally and abroad are structured to ensure continuous improvement. We have built a culture within our organisation with this in mind and our goal is to ensure that while we continually strive to understand our customers’ needs completely as technology shapes and changes them, we do so in a manner that brings results and earns their recognition as quality service providers.

Our commitment to all regulatory and legislative requirements is absolute and we strive to continue developing Quality Improvement Goals where we successfully meet our previous targets.

And so, when you choose to engage us at CSE Uniserve, whether it’s for a static VAR or for specific solutions to meet the needs of your company, you are not only getting the benefit of decades worth of engineering knowledge and expertise, but a company that is committed to growth, environmental protection and quality in all aspects of our business.

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    • Systems are factory-tested in our high voltage full loading test centre and come with high efficiency heat pipe cooling and optional closed loop pure water cooling.

PCC voltage – 500kV plus

SVC voltage – 6kV / 10kV / 27.5kV / 35kV / 66kV / 69kV

Capacity – 6Mvar to 1000Mvar plus




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