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Essential Energy s Inverter Trial

Introduction. Pursing new thinking and innovation to reshape the network business. Adding intelligence to system monitoring and operation and using that capability to enhance network reliability, utilisation and supply quality. Identifying and investing in the development of new technologies to achi

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Essential Energy s Inverter Trial

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    1. ENA – Smart Networks Summit Essential Energy’s Inverter Trial

    2. Introduction

    3. Intelligent Network Solutions Working with innovative Australian businesses to design applications that will accelerate the transformation of the electricity network Co development opportunities to date include advanced metering, electricity storage and inverter technology Making our network more flexible and able to accommodate the increased penetration of renewable energy generation across our footprint

    4. Inverter Development

    5. Four Quadrant Inverter The need to better manage real and reactive power flows and create more effective on-ramps for renewable generation is what inspired the development of our four quadrant inverter Typical low voltage inverters used for grid connection of small scale PV do not dynamically control reactive power or assist with network supply quality issues Essential Energy has been working with Surtek, a Brisbane-based electronics design and manufacturing company, to develop innovative grid-interactive inverter technology for cost effective network support at low voltage

    6. Most of the supply quality problems associated with small scale embedded generation occur in existing overhead open wire low voltage mains Now 20 plus years old and were designed for historic loads using the ‘first and worst’ concept of highest voltage at the transformer for light load and lowest voltage at the end of the run for peak load Four Quadrant Inverter

    8. 20 kVA modular 240 V single phase unit Four quadrant capability gives 40 kVA range (+ or – 20 kVA) 10 year life Short term rating 40 kVA at 30 seconds Inverter efficiency > 98% Harmonic output to AS 4777 but expected to be <1% High and low voltage set points Integrated battery management Communications capability 19 inch rack mounted Inverter Specifications

    9. Trial Location

    10. Inverter Control Settings

    11. Weekly Voltage

    12. Current Project Status Workshop conducted to assess prototype performance and determine modifications for a production version Under development Thermal management upgrade Improved event ride through Non-volatile memory Communication architecture DC/DC converter for renewables connection Statcom version 5 kVA pole mountable version Expected first deliveries of production units - May 2011

    13. Proposed Field Trials Upgrade of Queanbeyan prototype units In conjunction with Intelligent Communities project Feeder VAr support 2 x 60kVA three phase statcoms Single phase 11KV line energy storage support 20kVA inverter with 40 kWh lithium ion battery Community PV installation Distributed VAr support 5kVA pole mountable statcoms Renewable energy installations in Essential Energy Field Service Centres Further energy storage deployments on long rural lines

    14. Voltage pacification Providing combinations of real and reactive power to keep voltages within a given range Real power support on long rural feeders On high resistance circuits store energy at light load periods and release it at peak times to reduce voltage drop on the feeder Reactive power support On high reactance circuits use either leading or lagging reactive power to raise or lower voltages as required. Generation capacity enhancement Use lagging reactive power to compensate for voltage rises caused by embedded generation Motor starting compensation The fast (sub-cycle) response and short term rating of the inverter enables it to provide reactive power to balance the fluctuations due to starting of large motors Potential Applications

    15. Charging current compensation Long rural lines, particularly single wire earth return (SWER) are subject to voltage rises at light load due to capacitive charging currents. The inverter can provide lagging reactive power to compensate Power factor correction Providing reactive power to correct power factor - minimising line currents and losses Load and voltage balancing Transferring real and reactive power between phases to ensure balanced supply conditions Conservation voltage reduction (CVR) Controlling voltage levels to optimise energy usage and efficiency Loss reduction Managing loading patterns to optimise network current flows for loss minimisation Potential Applications

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    17. Local load control Potential to act as a signal generator for local control applications Harmonic suppression Acts as a “sink” for lower order harmonics through inductive coupling to the network Network monitoring Current and voltage measurement at the point of application. Potential Applications

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