Solar Legato Control Technology

Patented tracking control

Automatic control according to power consumption

When the generated power exceeds the consumed power, the system controls the generated power at a fixed percentage of the consumed power according to arbitrarily set parameters to reduce the occurrence of reverse power flow. Appropriate tracking control ensures that the generated power is used to the maximum extent possible.

Maximum output power available = Power consumption (kW) x [Proportionality factor A (%)] - [Fixed constant B (kW)]

Proportionality coefficient A (%)
Percentage of maximum power generation to power consumption

Fixed constant B (kW)
Power range for sudden fluctuations in power consumption or power generation

【Tracking control image】

Conventional self-consumption power generation

The inverter capacity is limited to avoid reverse power flow and therefore cannot generate maximum power.

　

When Solar Legato is installed

Controls following the power consumption and effectively utilizes the power generated for the conventional over-control.

　

　　

　　

In addition,
a new control method has been introduced!

Inverter pickup controlPatent pending 　※Some inverters may not be eligible. Please contact us for details.

The time lag associated with control has been largely eliminated by reducing the communication load through “inverter pickup control,” a unique algorithm that controls by narrowing down the number of inverters, and by modifying the system to measure only power consumption at high speed.In addition, control command values are calculated based on actual power generated. Control commands for inverters are given with more optimal control values.
※Control is performed as needed with timing that matches changes in power consumption.

　

To a control method with high enough speed to inhibit RPR activation.

　　

Function Points

　 　
• L・eye Monitoring Screen
  Power generation status can be checked at once by linking with Remote Monitoring System & Service L・eye.

  ※Solar Legato package, Solar Legato match only.

  

  Confirmation of detailed power generation status

  Securing Generated ElectricityMaintenance of asset values

  Detailed power generation status, including numerical values for each inverter, can be checked and notifications are sent via e-mail in the event of an abnormality.
  Power generation losses are minimized through precise monitoring and prompt notification in the event of abnormalities, and detailed power generation data can be saved to help prove asset value.

  

  L・eye Graphs of self-consumption control can be displayed on the monitoring screen.
  Trend, day, month, and year units can be displayed.

  

  

  

  Aging Analysis

  Calculates system output factor, equipment utilization factor, inverter conversion efficiency, and module conversion efficiency, and displays graphs showing changes in the power plant over time.

  Diagnosis of power outage

  For all inverters in a power plant, power outage is detected when 0 kW is generated for longer than the set time. Diagnostics can also be performed while inverter control is in progress as long as the control rate is above a set minimum value.

  

  

  Obtains and displays numerical control information such as power purchase, power consumption, and control setting values (A value/B value).

  
　
• Remote setting
  Remote control settings on the L-eye Monitoring Screen

  ※Solar Legato package, Solar Legato match only.

  Control parameter setting

  Set the control settings for power generated relative to power consumed and to prevent RPR* from being activated.

  *RPR (reverse power relay) detects reverse power flow and stops the inverter.

  

  self-consumption control override function

  This can be used to temporarily stop control, for example, to check the operation of an inverter.

  Time of day control setting/control calendar

  The value of the control setting can be set for each hour. It is effective to make settings for lunch breaks and holidays, when demand for electricity decreases. The control calendar allows you to check the status of time-of-day control settings on the calendar and change the settings.

  
　
• PR Contents for Environmental Contribution

  Web-based PR for self-consumption solar power generation

  ※Solar Legato package, Solar Legato match only.

  

  By using Mieruka Web, our measurement-linked PR software, you can link your environmental PR to L・eye's measurement information. The design can be customized (for a fee) to meet your needs.

  

  SDGs Content

  An overview of the SDGs and the 17 goals are explained with pop-up animations. The amount of electricity generated by renewable energy systems is displayed in terms of CO₂ reductions to promote the contribution to carbon neutrality, which is considered a priority issue for Japan in the SDGs efforts.

  

  Smart City Content

  Animated overview of smart cities and their technologies. Visualizes and promotes the use of clean energy to support smart cities.

  

  Decarbonized Content

  Explains the current state of environmental change and decarbonization in the style of a news program. It introduces institutions and various technologies related to decarbonization.

  

  Learn more about Mieruka Web

  Local display screen for self-consumption

  The Solar Link ZERO T5's HDMI output enables direct connection to a display for on-site display with less effort and cost (onerous). Enables on-site display of self-consumption items and storage battery information according to Solar Legato's measurements.^※。
  
  ※Displayable items: Displayable items: power generated, amount of power generated, amount of power purchased, amount of power consumed, storage battery output power, remaining storage battery power, sunlight intensity, temperature

  

Specification

Solar Legato Package

This package includes an automatic Output Curtailment system for self-consumption solar power generation and a remote monitoring system.

View package list

Solar Legato match

We propose the best system that matches your objectives and conditions when a package cannot.

Smart terminal block “FLIPLINK” can be mounted

Compact and simple terminal block type remote I/O, based on the concept of integrating a measuring instrument and a terminal block. 4 models are available for solar radiation and air temperature input (ST), contact input and pulse input (DI), contact output (DO), and analog input (AI).

Solar Legato stand alone

Local operation is possible without the need for an Internet connection. A web application on the local network can be used to check power generation status and download data in CSV format.

Self-consumption control Supported manufacturers

Yingli Green Energy Japan	WEST HOLDINGS	XSOL	SMA Japan	Canadian Solar Japan
Qcells	clean venture 21	Sungrow Japan	SANSHA ELECTRIC MANUFACTURING	Suntech Power Japan
SANYO DENKI	GS Yuasa(GS YourSignfra Systems(formerly Sanken Electric) incl.	JA SOLAR JAPAN	Shindengen Electric Manufacturing	SolarEdge Technologies JAPAN
SOLAR FRONTIER	Diamond&Zebra Electric	DMM.com	TMEIC	DELTA ELECTRONICS (JAPAN)
Trina Solar Japan	Nissin Electric	Japan Energy Holdings	Next Energy & Resources	NEMY
Panasonic SANYO Electric	Hitachi Industrial Equipment Systems	Huawei Technologies Japan	fujisaki electric	FUJI ELECTRIC
MARICI Japan （Former:ABB）	Mitsubishi Electric	MEIDENSHA	YASKAWA Electric

Storage battery control Supported manufacturers (including planned)

EDISON POWER	CONNEXX SYSTEMS	GS Yuasa(GS YourSignfra Systems (formerly Sanken Electric) incl.)	Sumitomo Electric Industries	Chint
Tesla	DELTA ELECTRONICS(JAPAN)	Toshiba IT & Control Systems	NITTO KOGYO	Huawei Japan
Murata Manufacturing	MEIDENSHA	YAMABISHI

※Please contact us for the model number.

Solar Legato Battery

Specification Details

installation requirement

・Reverse power relay shall be installed.
・The inverter must be of a manufacturer and model compatible with Solar Legato. ※1
・Ability to set a slope time suitable for self-consumption control.
・The number of inverters is limited to the number that can be measured by a single Solar Link ZERO unit.
・Either power consumption, purchased power, or both must be measured. ※2
・Control using stop/standby bits may be necessary when equipment capacity is large and consumption is low. ※3

※1.Since there is a time lag in control, the longer the measurement interval of the inverter, the less it can be properly controlled.
※2.Must be an instantaneous value measured by analog or RS-485 (multimeter, etc.). Conversion from pulses is not possible.
  In addition, if the measurement of purchased power continues to fail, power generation will stop.
  Please consider measurement with a multimeter, etc., taking into account the results of prior communication checks, etc.
※3.To prevent reverse power flow from occurring due to sudden power generation due to large fluctuations in power generation caused by solar radiation fluctuations (especially when the capacity per unit is large).

Operating environment ※We do not guarantee the operation of the site in other environments.

■Remote monitoring PC

OS	Windows 11 ( 32bit / 64bit )
Browser	Google Chrome / Mozilla Firefox / Microsoft Edge (All of these are the latest versions)

■PC for control setting

・A premises network to connect a PC for control settings is required (direct connection to the measuring machine is also acceptable).
・A separate Internet subscription is required to use the remote monitoring system.

Download

For those who want to experience the benefits of installing Solar Legato

You can simulate the installation with Solar Pro.

Download a 30-day trial of Solar Pro here.

Contact us