IEEE Power & Energy Magazine - November/December 2020 - 24

management a key challenge, as indicated by b in Figure 5.
In this instance, the VPP export is likely to be large enough
to cause the voltage to rise outside the allowed range. The
Salisbury trial highlighted that the orchestration of DERs
also poses new challenges. The trial showed that VPP operation can cause extreme peaks in demand that significantly
exceed the normal summer maximum load, e.g., when all
batteries were instructed to charge in anticipation of a storm
front ( c in Figure 5) Conversely, should a VPP be instructed
to discharge in the middle of the solar day during a highprice event or to provide frequency control and ancillary
services (FCASs), then voltage and thermal limits may be
breached due to reverse power flows ( d in Figure 5).
This article focuses on increased voltage ranges, reverse
flows, and D-PV implications for system security, with each
section outlining challenges and solutions. However, further difficulties and opportunities are emerging, including
implications for designing protection for the distribution and

transmission system, reactive power management, underfrequency load shedding, and system black-start capabilities.

Increasing Voltage Range
Challenges
Voltage management is growing more challenging in Australian distribution networks as extreme summer temperatures
drive air-conditioning demand and the D-PV uptake continues. The net effect is a broader range of voltage conditions
that can rapidly change during relatively short periods on a
single network feeder. Visibility in the LV system generally
remains limited; however, some monitoring exists, and new
techniques for data visualization and analysis are emerging.
Existing Voltage Conditions

To comply with Australian Standard AS61000.3.100-2011,
the 99th voltage percentile (V99%) at a customer's point of

Scope
Expanded Scenario Analysis
Summer Peak
Demand

Winter Peak
Demand

Minimum
Demand

Underlying
Demand

Ultimate Area
Planning

Transmission

Subtransmission
Expansion in Scope of Planning to
Consider a Greater Number of Conditions

Depth

Substation

Feeder

Distribution
Transformer

LV Network

Expansion in
Depth of Planning
to the LV Network

Customer
Historical Scope of Planning
Current and Future Scope of Planning

figure 4. SAPN's initiative to increase the depth and scope of network planning activities. For further details, please refer
to "Future Network Strategy" in the "For Further Reading" section. LV: low voltage.
24	

ieee power & energy magazine	

november/december 2020



IEEE Power & Energy Magazine - November/December 2020

Table of Contents for the Digital Edition of IEEE Power & Energy Magazine - November/December 2020

Contents
IEEE Power & Energy Magazine - November/December 2020 - Cover1
IEEE Power & Energy Magazine - November/December 2020 - Cover2
IEEE Power & Energy Magazine - November/December 2020 - Contents
IEEE Power & Energy Magazine - November/December 2020 - 2
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IEEE Power & Energy Magazine - November/December 2020 - Cover3
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