Ensto LVDC Microgrid solution improves distribution reliability and brings tenfold increase in capacity


Ensto LVDC (low voltage direct current) enables e.g. independent electricity network branch with microgrid functionality, interconnectivity with renewable energies and energy storages.

The demand for higher quality electricity, the call for more reliable distribution as well as increasing local production, such as in the form of solar energy, has resulted in utilities facing new challenges when building and balancing their distribution networks. LVDC solves the most pressing problems, like a lack of capacity, power losses, poor quality electricity, unbalance loads and variations in voltage or frequency. LVDC solution is a cost-efficient way of upgrading or building future-proof networks. 

Ensto’s LVDC solution will:

  • Improve the quality and reliability of electricity distribution.
  • Allow local power generation while connecting renewable energy to the grid.
  • Eliminate non commercial losses and reactive power.
  • Maximize distribution capacity.
  • Support the ability of end users and producers to participate actively in the electricity market.

 

Why choose LVDC?


LVDC:

  • Provides cost effective solutions: low voltage grids can be built instead of medium voltage and reduce costs.
  • Maximizes high power quality.
  • Minimizes electricity distribution interruptions.
  • Solves issues like undervoltage, overvoltage and unbalanced loads.
  • Eliminates commercial losses.
  • Supports grid frequency variations by using energy storage.
  • Balances demand peaks through cost effective energy storage.

 

Microgrid


An LVDC distribution network creates a microgrid, enabling on-grid and off-grid operation. It can act as a virtual power plant for the grid and, when required, it can provide both frequency support and voltage support with reactive power control. The Ensto microgrid solution also includes controllers for renewable energy sources like solar and wind as well as electric vehicle charging.

Ensto’s LVDC solution for modern utilities is built on a 1500V DC (± 750V), containing a nominal voltage line that acts as its backbone. That definition allows all installations to be made according to low voltage electrical installations standards, simplifying the configuration, staffing and execution of the projects. An LVDC branch line can provide ten times more distribution capacity when using already existing low voltage overhead lines or underground cables.

A distribution network branch with LVDC releases the MV AC grid from the reactive power that customers produce or consume. That generates better control of the reactive power on the MV grid side while acting as a static synchronous compensator (STATCOM).

LVDC units

  • LVDC Feeder Station 
  • Solar Controller for Maximum Power Point Tracking 
  • Battery Management
  • LVDC Substation 
  • Electric Vehicle Charging 

 

Seamless cooperation between LVDC Feeder Stations and Substations


LVDC Feeder Stations

An Ensto LVDC Feeder Station connects to the 20kV MV grid through a transformer, inverts the power to +-750V DC and connects the customers via LVDC. Thus, the MV grid sees the LVDC microgrid and its energy using customers as a single symmetrical three-phase load with very low total harmonic distortion (THD). This is how the microgrid can support the MV grid voltage.

An Ensto LVDC Feeder Station functions bidirectionally, opening the way for the integration of a large number of local distributed power production entities, e.g. solar, connected along the LVDC backbone.

The benefits

  • Minimizes reactive power  
  • Maximizes network capacity
  • Functions bidirectionally
  • Enables connectivity for renewable energy.

LVDC Substations

An Ensto LVDC Substation converts the +-750V DC to the common 230V AC for customers. Since the AC is produced locally on site, it is high quality and has none of the voltage drops or interferences typical of long AC branch lines that are connected to numerous varying loads and electronic devices. The same principle means the substation isolates all nonlinear loads and THD sources produced by customers that normally affect the MV grid – due to a DC line between the local Substation and the Ensto LVDC Feeder Station.

The Benefits

 

  • High quality voltage for end users
  • 250A short circuit current for fast and safe protection from faulty current
  • Balanced phase currents
  • The storage of local energy
  • Connection to the Ensto Utility Manager. 

Fast energy storages and battery management

Fast energy storages can be connected to LVDC by Ensto Battery Management. The storage can easily be expanded to serve customers in off-grid mode, thus ensuring the reliability of supply. The use of Ensto Battery Management can also act as a virtual power plant to support HV and MV grid frequency in high-demand, peak situations.

Connectivity to LVDC with DC mode solar power and local energy storage units is straightforward, resulting in possibilities for the easy generation and adjustment of the use of electricity.

Ensto Utility Manager - Preventive maintenance and communication for distribution networks

Ensto Utility Manager is a cloud-based platform that prevents, controls and locates any possible defects in electricity distribution by analyzing continuous measurement and status information from Ensto LVDC Microgrid, LVAC Power Quality and Network Automation solutions. This reduces interruptions in electricity distribution and declines complaints. The Utility Manager permits detailed viewing and controlling of the network and its customer interactions, supporting billing, site priorities and the development of new services. It connects the complete LVDC branch and all its devices to the utility's SCADA.

PROJECT SALES

LVDC solution is always tailored to customer needs. By working in partnership with you, we will find the most effective and optimal way to establish an LVDC solution.

Please contact your country sales