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Voltage management for smart networks

Bristol BlueGreen has developed a number of products based around its innovative and patented voltage management technology.

These products deliver solutions for voltage variance, telemetry, phase imbalance, peak loading, load factor and reactive power.

For further details please follow the links above.

For further details please follow the links in the menu.

Voltage management for smart networks
Voltage management for smart networks

Voltage variance

UK DNOs are mandated to supply electricity to customers between 216V and 253V. Where there are large variations in the load, or where significant microgeneration is installed, it is increasingly difficult to guarantee a supply within these limits. Believe it or not, there are a few examples of substations delivering above 253V and very occasionally even dropping under 216V.

Voltage variance is likely to become more of a problem as greater loads such as electric vehicles and heat pumps are introduced to the network and as more renewable generation is connected to the low voltage network.

Bristol BlueGreen’s unique patented technology can cost-effectively address the issue of voltage variance. The BlueGreen Power Saver regulates the voltage to a set point, giving confidence that supply voltage remains within specification.

Voltage variance

SOLVED

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lower LIMIT
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UPPER LIMIT
Voltage Variance

Telemetry

Most UK DNOs currently have no visibility of voltage and load on the LV network. The BlueGreen solution measures network performance and transmits data back to base in real time. The units can be configured to report on:

  • Load voltage
  • Supply voltage
  • Real power (kW)
  • Power factor
  • Internal temperatures
  • PWM duty cycle
  • Reactive power
  • Apparent power
  • Load current
  • Other sensor readings  (where fitted)
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visibility

Providing Telemetry

SOLVED

Phase imbalance

Electrical equipment – especially motors and their controllers – will not operate reliably on unbalanced voltages in a 3-phase system. Generally, the difference between the highest and the lowest voltages should not exceed 4% of the lowest voltage. e.g. if the lowest voltage is 220V, the other two must not exceed 228.8V.

Greater imbalances may cause overheating of components – especially motors – and intermittent shutdown of motor controllers. Motors operated on unbalanced voltages will overheat, and many overload relays can't sense the overheating. This has a detrimental impact on the life of the motor. In addition, many solid state motor controllers and inverters include components that are especially sensitive to voltage imbalances.

With the BlueGreen three-phase voltage manager installed you can be assured that phase imbalance is completely eliminated and that the voltage delivered from each phase will remain within specification.

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Phase imbalance

SOLVED

Peak loading

A typical UK distribution network will experience peak loading between 4pm and 10pm. The network must be able to support this load and reinforcement will be required when network limits are reached. By reducing load voltage - and therefore peak loads - the network operator is able to defer expensive reinforcement.

BlueGreen technology automatically adjusts its control signals to maintain a stable output voltage. A 10% reduction in voltage will deliver up to 19% reduction in peak power. For resistive loads this reduces instantaneous power, but extends operation flattening out the demand curve. For other loads it results in reduced power and a reduction in net energy consumed.

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Peak loading

IMPROVED

Load factor

Load factor is a measure of the utilisation of a network over a period, with reference to its capacity. It is defined as average load divided by maximum possible load. A high load factor indicates efficient use of the network assets.

With BlueGreen technology, reducing the peak load and spreading the demand slows down the rate of growth of demand on the network and defers the need for network reinforcement.

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Guaranteed deferral of network investment shadow
Load factor

solved

Reactive power

Reactive power is present in a system containing reactive (inductive or capacitive) components and can be either produced or consumed by different load/generation elements. If reactive power in a system is too high, there is increased heat loss in transmission lines and loads as the current flowing through the system is much higher, creating a potentially hazardous breakdown situation.

The BlueGreen reduces load voltage which also reduces reactive power.

Reactive power

solved

product
Improved
 network
efficiency
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