Static Synchronous Compensator

  • Fastest solutions available for Dynamic Voltage/VAR compensation
  • Active harmonic filtering capability
  • Smallest footprint per kVAr
  • Newest, most reliable technology available
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What is STATCOM?

A STATCOM, or Static Synchronous Compensator, is a device used in electrical systems to improve their quality and stability. It is a specific application of a Voltage Source Converter (VSC) in FACTS (Flexible AC Transmission Systems) technology.

STATCOMs are capable of generating or absorbing reactive power ultra-fast and continuously, offering a distinct advantage over conventional technologies such as capacitor banks or inductors, which adjust reactive power in discrete steps and with a slower response speed. This dynamic, real-time compensation not only optimizes power quality, but also ensures accurate and stable voltage control, even in the face of the fastest and most demanding load variations on the grid.

statcom technology

STATCOM Technology

1. Control and Protection
Equipped with a friendly HMI interface, our STATCOM offers ease of operation and multifunctional control settings. The system features remote real-time monitoring capabilities.

2. Cooling system
Air/water or water/water cooling options are available. Our systems are designed with water pump redundancy for greater reliability.

3. Power Unit
This is the key element of the STATCOM. Our design offers high voltage with extremely low harmonic distortion using a low switching frequency that reduces power losses. We offer Wire bond or Press Pack IGBTs.

4. Reactor
Air core reactors offer high power density solutions. For some ratings and topologies, we can offer iron core, indoor reactors contained within the STATCOM for even a smaller footprint.

STATCOM Operating principle

STATCOM is the newest VAR compensation technology available. The system is connected in parallel to the grid, generating a voltage waveform synchronized with the grid. Controlling the output voltage magnitude and frequency we can inject a rapidly changing current to follow the load reactive power requirements.

statcom operating principle

How does a STATCOM work?

Functionally, a STATCOM consists of a voltage source converter that converts direct current to alternating current with any phase and magnitude. This is achieved using power semiconductor devices, such as IGBTs , which are controlled by modern and sophisticated control systems. By varying the phase and magnitude of the injected voltage, a STATCOM can act as a source or sink of reactive power.

By injecting reactive power into the grid, a STATCOM can increase the voltage at the point of connection. Similarly, by absorbing reactive power, it can decrease the voltage. This ability to act dynamically is especially valuable during fault conditions or system disturbances, as it can help to quickly stabilize the grid.

Statcom PDF

Download this brochure for more information about STATCOM and SVC technology specifications


STATCOM Applications

Proper selection and configuration of equipment can offer substantial benefits 

statcom renewable generation

Renewable Generation, Transmission & Distribution

Power factor control and voltage regulation is a must for renewable generation to comply grid code requirements.

  • Mitigate harmonics
  • Meet voltage & power factor requirements
  • Stabilize grid voltage
  • Reduce transmission losses
  • Balance three-phase power
  • Improve transient stability
  • Increase line capacity
  • Damp power oscillations
statcom steel industry

Steel Industry

A steady voltage and low harmonic content, increases productivity

  • Reduce electrode consumption
  • Increase refractory life
  • Garner more favorable tariffs
  • Reduce outages
statcom heavy industry

Heavy Industry

Load evolution demands faster and more efficient solutions to avoid downtime and increase equipment life. 

  • Energy cost reduction
  • Reduce outages
  • Increase productivity
  • Comply grid code requirements

What are the applications of STATCOM?

STATCOMs deploy their versatility in a wide range of scenarios, being particularly beneficial in both transmission lines and industrial environments. Let's examine the advantages they offer, segmented according to their field of application:

Industrial Users Application

1. Power Quality Improvement: Industrial facilities, such as steel mills, often face loads that introduce significant voltage fluctuations and generate harmonics. STATCOMs can effectively mitigate these disturbances by providing or absorbing reactive power quickly, which substantially improves power quality and decreases harmonics, benefiting from their inherent filtering capability.

2. Unbalance Correction: With a delta connection configuration, STATCOMs are particularly effective in correcting phase-to-phase unbalance, a common challenge in environments with asymmetrical loads. This is crucial to prevent abnormal operating conditions and protect sensitive equipment.

3. Flicker Reduction: The operation of electric arc furnaces and energy-demanding machinery can cause rapid and severe load fluctuations. STATCOMs intervene to counteract these effects, stabilizing the voltage and thereby improving the visual stability and performance of sensitive equipment.

4. Power Factor Improvement: In the industrial context of a steel mill, optimizing the power factor is not only a matter of energy efficiency, but also a matter of economics. By improving the power factor, penalties imposed by the utility company can be minimized and the efficiency of electrical energy utilization can be maximized.

Transmission Line Application

1. Real-Time Voltage Control: STATCOMs are essential for dynamic voltage control in transmission systems, which is crucial for maintaining operation within the limits of safety and efficiency.

2. Grid stability: They help maintain system stability in the face of transient events, such as line outages or system failures, by providing immediate voltage support.

3. Transfer Capacity Expansion: They allow greater load transfer over existing lines by improving the voltage profile, which can delay or eliminate the need to build new transmission lines.

4. Transmission Loss Reduction: By optimizing reactive power flow, STATCOMs can help reduce transmission line losses.

FACTS - SVC vs STATCOM Comparison

STATCOM is a newer technology than SVC, because of its advantages and versatility, it is replacing SVC as the main power quality and reactive compensation solution.

statcom facts comparison

STATCOM Case study

Industry: Steel
Load: 2 x 120 MVAs EAF steel facility
Objective: Comply new grid code requirements
Solution: Replace fixed harmonic filters with 320 MVAR STATCOM solution

Although the main objective was to comply grid code power factor and power quality requirements, we obtained substantial productivity benefits.

statcom case study
statcom production increment

We have installed 90% of the STATCOMs in Mexico

Learn more about our STATCOM projects

ford diram

Ford Chihuahua in compliance with Grid Code with STATCOM


There was a non-compliance in the plant according to the Grid Code power factor parameters under low load conditions. In addition, the plant was constantly experiencing voltage fluctuations causing problems in electronic equipment and restart or failure of the robots.

Solution and results

We installed a dynamic compensation equipment that will resolve defaults under low load conditions and mitigate the effects of voltage fluctuations on the electronic equipment.

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tupy diram

Success story: Tupy acquires a STATCOM and complies with Grid Code


  • Capacitive default 64% of the time
  • High load variations due to furnace operation
  • High load variability
  • The 5th harmonic filter is overcompensating the system with 13.5 MVAr in the measurement period.

Solution and results

  • Installation of a +/- 6 MVAr STATCOM
  • The STATCOM met the dynamic MVAr demand created by the operation of the furnaces.
  • An average PF value of 0.98 is met 100% of the time.
  • Improved power quality parameters
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ford diram

Grid Code Compliance Solution for Tayahua MINERA FRISCO


Previously, the Load Center did not comply with the power factor requirement indicated in the Grid Code. Therefore, an equipment was implemented, which could adapt to the reactive power demand by reading two feeders at different voltages and perform a dynamic compensation to ensure compliance at the PCC (114 kV).

Solution and results

STATCOM 5 MVAR @ 34.5 kV Thanks to the fact that our installed technology has the capacity to deliver and absorb the necessary reagents dynamically to control the power factor of the plant at the connection point, we were able to meet the objective of maintaining the power factor between 0.97 and 1.00 at least 95% of the time, in accordance with the future requirement of the Grid Code

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outkumpu diram

Outokumpu Mexinox now complies with Grid Code 2.0 Phase 2 thanks to STATCOM


To achieve compliance with Grid Code 2.0 phase 2, that will be effective on April 8, 2026, it was necessary to install a +/- 12 MVAR STATCOM, connected to the 20 Kv main bus and consider leaving the existing compensation equipment in place.

Solution and results

With the installation of the STATCOM, it was possible to compensate the necessary reactives, leaving the power factor at 0.98 inductive values, 100% of the time, complying with the requirement established by the Grid Code 2.0 Phase 2.

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Graftech diram

Graftech Mexico improves its power quality parameters using STATCOMs


  • Inductive non- compliance 100% of the time
  • High load variations
  • No compensation equipment existent
  • Relatively high 2nd harmonics level

Solution and results

  • Installation of two STATCOMs +/- 10 MVAr each
  • STATCOM met the dynamic MVAr demand created by the variable load operation of the load center.
  • An average PF value of 0.99 is met 100% of the time.
  • For voltage unbalance, a maximum value of 0.171 % was achieved during the measurement period, remaining below the 2% limit established in the Grid Code.
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posco diram

POSCO decreases power unbalance by 60% with STATCOM


There is non-compliance with the power factor and current unbalance parameters established in the Grid Code 1.0.

  • 17 % of the time the PF is in inductive non-compliance.
  • 72 % of the time the PF is in capacitive non-compliance.
  • The current unbalance has an average value of 19.23 %.

Solution and results

With the installation of the STATCOM, the power factor and current unbalance parameters were achieved, which decreased by 60%, with the requirement established by the Grid Code 2.0 Phase 2.

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ternium diram

Ternium Largos Norte complies with Grid Code 2.0 thanks to STATCOM


  • Total harmonic distortion of demand.
  • Short-term voltage fluctuation index.
  • Long-term voltage fluctuation index.
  • Current unbalance.

Solution and results

  • With the installation of the STATCOM, it was possible to maintain the power factor close to the unity value 97% of the time, complying with the limits established by the Grid Code 2.0, phase 1.
  • The individual harmonic content decreased drastically, the values of the second harmonic remained at 2.05 % and the fourth harmonic at 0.47 %, which decreased close to 50 %, being within the limits established by the Grid Code 2.0 phase 1.
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posco diram

Draxton Irapuato improves its power factor with STATCOM


Diram was approached by Draxton to request a Grid Code study at the Irapuato plant in which there was detected a power factor non-compliance

Solution and results

Due to the variability of the load, and having a considerable current unbalance, the solution is a STATCOM.

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posco diram

Draxton Saltillo uses a STATCOM to comply with the Grid Code 2.0


Diram was approached by Draxton to request a Grid Code study at the Saltillo plant in which a non-compliance in power factor and current unbalance was detected.

Solution and results

Due to the variability of the load, and having a considerable current unbalance, the solution was a STATCOM.

See more
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