Technical information SUNNY TRIPOWER CORE1-US

1 STP50-US-40-GridServices-TI-en-10 | Version informationSUNNY TRIPOWER core1 -USGrid Support Utility Interactive InvertersTable of ContentsSMA Solar Technology America LLCT echnical informationSTP50-US-40-GridServices-TI-e n-102 Table of Contents1 Grid Support Utility Interactive and Structure of this Functionality of PV SMA Detection "Anti Islanding".. Support Depending on Grid Voltage "Low/High Voltage Ride-Through".. Support Depending on Power Frequency "Low/High Frequency Ride-Through" .. Rate During Normal Operation "Normal Ramp Rate".

2 After Grid Fault "Soft Start Ramp Rate".. specification of a power factor cos "Specified Power Factor".. Power Control as a Function of Grid Voltage "Volt-Var Mode".. Power Limitation Depending on Power Frequency "Frequency-Watt Mode".. Power Limitation Depending on Grid Voltage "Volt-Watt Mode"..151 Grid Support Utility Interactive InvertersSMA Solar Technology America LLCT echnical information3 STP50-US-40-GridServices-TI-en-101 Grid Support Utility Interactive and Structure of this DocumentIn this document, the advanced inverter functions (see Section , page 3) as well as the SMA inverters equippedwith these functions (see Section , page 3) are presented in accordance with the current UL 1741 SA "GridSupport Utility Interactive Inverters and Converters".

3 In addition, the advanced inverter functions are presented in detail (see Section 2, page 4). The following structureis being used: Function description in accordance with UL 1741 SA "Grid Support Utility Interactive Inverters and Converters"with the most important key values Implementation of the individual functions with SMA invertes via Speedwire/Webconnect parameters or Modbusregisters (SMA Modbus or SunSpec Modbus) Maximum value tested Minimum value tested Value tested according to Rule 21 or tested averageDepending on the product, the functions can be configured via the user interface of the inverter or a communicationproduct ( SMA Cluster Controller).

4 Depending on the availability, the configuration can also be performed usingSMA Modbus or SunSpec Modbus. information on how to change operating parameter can be found in therespective documentation at Functionality of PV InvertersAll PV inverters convert direct current into grid-compliant alternating current. If the grid voltage or power frequencyexceed the thresholds specified by the grid operator, the grid-tied PV inverters must stop to feed in alternating currentand disconnect from the utility grid in accordance with local standards and PV inverters are also able to modulate their output power to support the utility grid interactively.

5 These PVinverters react to changes in the utility grid by varying their power factor for example or by achieving an improved gridstability using other grid management services. These modern PV inverters are also called smart or advanced invertersdue to their advanced inverter the growth of the PV industry and a rising proportion of PV power in allover power generation, it becomesincreasingly important that PV inverters make a significant contribution to improved grid stability and grid services. Theprerequisite for this is the smart grid interconnection of modern PV inverters with an advanced inverter function to thegrid in accordance with the current UL 1741 SA "Grid Support Utility Interactive Inverters and Converters".

6 SMA InvertersThe following SMA inverters feature from firmware version advanced inverter functions in accordance withthe current UL 1741 SA "Grid Support Utility Interactive Inverters and Converters": STP 50-US-40 ( SUNNY TRIPOWER CORE1-US )2 Function DescriptionSMA Solar Technology America LLCT echnical informationSTP50-US-40-GridServices-TI-e n-1042 Function Detection "Anti Islanding"The islanding detection function detects the formation of stand-alone grids and disconnects the inverter from the utilitygrid.

7 Islanding can occur when at the time of utility grid failure, the load in the shut-down sub-grid is roughly equivalentto the current feed-in power of the PV system. With active islanding detection, the inverter continuously checks thestability of the utility grid. If the utility grid is intact, this has no impact on the utility grid and the inverter continues tofeed in. Only if a stand-alone grid has formed will the inverter disconnect from the utility grid. The islanding detectionfunction is activated by Support Depending on Grid Voltage "Low/High Voltage Ride-Through"Three thresholds for minimum grid voltage and two thresholds for maximum grid voltage are defined in accordancewith UL 1741 SA during grid support depending on the grid voltage "Low/High Voltage Ride-Through (L/H VRT)".

8 Each maximum threshold may be exceeded and each minimum threshold may be undershot for a certain time. Thepermitted overvoltage and undervoltage ranges are derived from these thresholds and time (per Unit)Time (s) Trip High Voltage CurveMust Trip Low Voltage CurveRide-Through High Voltage CurveRide-Through Low Voltage CurveLV3 Figure 1: Overvoltage and undervoltage ranges for grid support in accordance with the "Low/High Voltage Ride-Through"DesignationDescriptionVolta ge (per unit)Nominal voltage of the connected inverterMust Trip High VoltageThis curve specifies the thresholds within which the shutdown process of the in-verter must be completed when permitted voltage values are Trip Low VoltageThis curve specifies the thresholds within which the shutdown process of the in-verter must be completed when permitted voltage values are High VoltageIn the operating mode "Mandatory Operation".

9 This curve specifies how long theinverter must continue feeding in when permitted voltage values are the operating mode "Momentary Cessation", this curve specifies how muchtime the inverter has to reduce its output power to zero when permitted voltagevalues are Function DescriptionSMA Solar Technology America LLCT echnical information5 STP50-US-40-GridServices-TI-en-10 DesignationDescriptionRide-Through Low VoltageIn the operating mode "Mandatory Operation", this curve specifies how long theinverter must continue feeding in when permitted voltage values are the operating mode "Momentary Cessation", this curve specifies how muchtime the inverter has to reduce its output power to zero when permitted voltagevalues are rangeNNRange around nominal grid voltageLVUndervoltage rangeThe inverter continuously checks the grid voltage.

10 The inverter reacts to non-permitted overvoltages and undervoltagesin accordance with the set operating mode: Operating mode "Mandatory Operation"In the operating mode "Mandatory Operation", the inverter continues to feed in up to a set point in time (RideThrough) and then starts the shutdown process. The operating mode "Mandatory Operation" is always can configure the thresholds of the overvoltage or undervoltage ranges via the parameters listed in thecorresponding table. Operating mode "Momentary Cessation"In the operating mode "Momentary Cessation", the inverter reduces its output power to zero up to a set point intime (Ride Through) and then starts the shutdown process.