active power filter
Power Quality
Jun 16, 2018

ZDDQ Power quality solutions

Power Quality

Power quality refers to the ability of electrical equipment to consume the energy being supplied to it in an efficient and effective manner. A number of power quality issues including electrical harmonics, poor power factor, voltage instability and imbalance impact on the efficiency of electrical equipment.

This has a number of consequences including:

Higher energy usage and costs.

Higher maintenance and repair costs.

Equipment instability and failure resulting in process or business disruption.

How is your Power Quality?

Power Quality – the efficiency and effectiveness of power supply.

Good power quality is critical in efficient and uninterrupted industrial processes.

Poor power quality can result in unstable equipment operation or failure, inefficiencies and reduced equipment lifespan, interruption of supply and plant down-time.

ZDDQ specialise in evaluating, auditing and addressing a wide range of power quality issues to increase plant, motor and equipment efficiencies and the bottom line.

What solution is right for us?

Power consumption can be influenced by an intricate and complex set of variables. Our deep knowledge of power supply and electrical systems allow us to pinpoint your requirements as a power user and design or assign a solution that addresses your needs.

This is generally done in 2 ways:

By understanding your power usage and any problems that may be occurring, our experienced people will recommend the right solution.

ZDDQ can perform a full power audit including data logging over a set period of time. This can allow an intimate knowledge of your power profile allowing us to develop a cost benefit analysis against a range of technologies of combination of technologies.

Our Technologies and Solutions are Varied

Power Quality products can be sorted in five general categories

1. Active Power Filters

Active power filters (APF) are devices connected in parallel with the load to be compensated. They can be understood as controlled current sources that provide any kind of current waveform (in terms of phase, amplitude and frequency) in real time .

APF are flexible, high performance and cost-effective solutions used to mitigate all the power quality problems generated by the equipment installed in electric power systems, enhancing equipment operating life time, and improving power system capacity.Active Power Filter products include:

Active Harmonic Filters (AHF)

Static VAR Generators (SVG)

Active Load Balancers (ALB)

Hybrid VAR Compensators (HVC)

2. Power Factor Correction

Power Factor Correction (PFC) aims to improve power factor and hence power quality, switching in capacitors to offset usually inductive loads, for example electric motors. PFC systems increase the efficiency of power supply, delivering immediate cost savings on electricity.Technologies in this group include:

Power Factor Correction (PFC)

Smart Power Factor Correction

Static VAR Generators (SVG)

Hybrid VAR Compensators (HVC)

3. Static Compensators(SVG and SVC)

STATCOM and SVC use power electronics for regulating voltage, power factor, harmonics and stabilising voltage of medium and high voltage systems. They are called Static as they have no moving parts (other than internal switchgear).

The speed of response of a STATCOM is faster than that of an SVC and the harmonic emission is lower, however STATCOMs typically exhibit higher losses and may be more expensive than SVC. Selecting which is best depends on your system characteristics and need for compensation of either or both reactive power or voltage stability.

Prior to the invention of the SVC, power factor compensation was the preserve of large rotating machines such as synchronous condensers or switched capacitor banks.

Static VAR Compensators (SVC)


4. Voltage Management

Voltage Management is a process by which the incoming voltage from a power source such as the grid or solar array, is optimised or stabilised to alleviate low, high, or changing voltages.

Voltage optimisation specifically aims to reduce the voltage received by electrical equipment to improve operating efficiency as well as reduce energy costs and power demand. It can improve power quality by eliminating or minimising transient voltages as well as balancing phase voltages.

STATCOM and SVC are used to stabilise medium and high voltage as well as to filter harmonic distortion and control reactive power.

Products available are:

Load side:

Voltage Optimisers (VO)

Voltage Stabilisers (VS)

Supply side:

Static VAR Compensators (SVC)


5. Energy Storage Devices

These products prevent power loss by storing energy in capacitors and/or batteries to maintain constant supply. By storing power, these units can use this stored energy to either replace the existing supply where needed or to address inconsistencies or errors in the supply.

What Problems Can They Solve?

Typical Outcomes Of Poor Power Quality

Brown Out Voltage Sag or Dip

Brief Black Out or Very Short Interruptions

Black Out, Long Duration, Long Interruption

Surge Voltage Spike

Voltage Swell

Intermittent Tripping Harmonic Distortion

Voltage Flicker Voltage Fluctuation

Electro Magnetic Fields Noise

Unbalanced Voltage

Experts in Power Quality soltuions

Our aim is to improve power quality, optimise power usage, reduce power costs and increase safety and compliance – outcomes critical to energy intensive sectors such as mining, industrial, commercial and power utilities.

Our team of highly qualified and skilled engineers can assist in providing a power quality solution to suit specific applications. Comprehensive system support and analysis ensure your installation is performing at its best.

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