Grid Integration Challenges and Solutions

Solar energy plant incuding high harmonics into the grid

Renewable energy is injected at multiple points into a network to supplement or replace traditional generation. Grid compliance, high harmonic emissions and voltage regulation are some of the challenges for plant operators.

Challenges our Customers Experience before engaging Omniverter

Solar Grid Compliance investigation
Windfarm power quality investigation

As growth in distributed embedded generation increase the risk of instability on electric utility systems, transmission and distribution utilities are tightening grid-code requirements. Each distribution area set out the minimum requirements that a licensed electricity generator must meet in carrying out its obligations to generate electricity within its service area under its license.

Some of the common problems associated with electricity issues are:

  • Grid code compliance achievement
  • Voltage unbalances due to single phase inverters in the network.  
  • Transformer gassing, flashover, insulation damage.
  • Electromagnetic interference at the field bus and harmonic resonances.
  • Low voltage ride through the response of inverters
  • Unstable or weak distribution grids. Sometimes capacitance in the network.
  • Notching or oscillation issues.

Common Power Quality Issues Causing these Problems

Voltage Sag

Voltage Sag/Dips

Voltage sags are the primary cause of unplanned production stoppages in industry. Causes include electrical network faults due to weather, animals across terminals, traffic accidents, load switching upstream, startup of large loads or transformer energization.

Voltage Transiets

Voltage Transients

A sudden change from the nominal voltage or current may be caused by faults in the network, switching of large loads, load shedding, or switching of capacitor banks upstream in the utility network. Voltage surges also occur but may be less severe.

Power Interruption

Momentary Power Interruptions

Momentary power loss is complete loss of voltage on one or more phase conductors between 0.5 cycles and 3 seconds.  The most common forms of power failure are due to utility protection systems, e.g. recloser operations, switching, breaker tripping and equipment failures.

Harmonic Distortion

Current & Voltage Harmonic Distortion

The use of non-linear loads is the main cause of harmonic distortion. The injection of harmonic currents results in voltage distortion which may cause electronic equipment failure, increased heat in drives and transformers, unwanted tripping, malfunction of sensitive equipment and controls and failure of imaging and scanning equipment.

Possible Solutions to your Power Quality Problems

The Omniverter approach is to understand your particular issue via data analysis prior to offering a product solution. The learn more about our solutions we use individually or in combinnation follow the link below.

Product Solutions
Benefits from Solving these Power Quality Issues

Benefits derived fromOmniverter solutions:

  • Increased production.
  • Improved stringent quality requirements.
  • Improved equipment lifecycle and payback period.
  • Minimize the effect of incorrect reading and malfunction of data logger to the control substation.
Technical Details
    Accurate data requires the use of dedicated power quality analyzers. Assessment of the data allows us to identify specific problems and only then do we offer a solution.
Summary of the Power Quality Issues (Based on IEEE 1159:2019)
AVC Technical Paper
AVCRTS Technical Paper
Solar & Wind Technical Paper
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