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G5.SAS Solar Inverter Test Solution

The G5.SAS series are unidirectional sources. It was developed specifically for testing inverters and simulating solar arrays and is suitable for use in laboratories and on test benches. The modular and finely graded G5.SAS series is characterized by highly dynamic response times and a wide current-voltage range with an auto-ranging factor 3. The power supplies feature especially low capacitance values in the output filter stage

and switchable earth leakage resistors for adaptation to the insulation measurement of the DUT. The G5.SAS series is equipped with the powerful application software SASControl, which offers comfortable possibilities for the calculation of solar arrays. I-V curves are calculated with high accuracy in real-time.

Key Facts

Technology

Technologically advanced, fast switching, compact 19-inch power supplies
High control dynamics in the 100…200 μs range – even at higher power levels up to 5000+ kW
Exceptional accuracy with additional high-resolution current measurement range
Wide current-voltage range with an autoranging factor 3
CV, CC, CP, CR, and Ri/Gi-Sim control modes
Highly efficient, resulting in a significant reduction of energy consumption and heat dissipation

System Capability

Modular and easily scalable systems
Parallel, series, and mixed operation with a digital high-speed bus
Simple multi-unit configuration with the operating software
Easy rack mounting
Liquid cooled systems in IP54 available
Optional safety features such as 2-channel safety interface and insulation monitoring
Turn-key cabinet solutions or project-specific system integration according to customer specification

System Control

Operating software, extended analysis, parameterization options, and calibration
Application software with visualization, programming, and data logger
Powerful application programming interfaces (APIs)

Solar Array Simulation Features

The G5.SAS series features especially low capacitance values in the output filter stage, switchable earth leakage resistors, and the versatile application software SASControl. The powerful platform for R+D and testing of PV inverters fully complies with the efficiency measurement procedures for maximum power point tracking (MPPT) in inverters as described in EN 50530. The core of the application software SASControl is a versatile script programming system that allows the easy implementation of individual programming sequences. Report generation of measured data is also included.

Features such as adjustable controller settings and the integrated powerful 8-channel digital scope assist the user to quickly and easily achieve optimal system behavior for a special application requirement. The G5.SAS series also offers the possibility to store, edit, and recall any device configuration on board the power supply.

Modular and Easily Scalable Systems

The output of an individual power supply is in the range from 0…9 kW to 0…5000+ kW, up to 3000 VDC. The advantageous modularity of REGATRON power supply solutions allows the system to be easily adapted to ever-changing test requirements. It is possible to reconfigure between parallel, series, and mixed operation. Moreover, the system can be expanded with additional power supply units or may be split into smaller units.
Whether for single devices or powerful multi-device systems, REGATRON also offers turn-key cabinet solutions or project-specific system integration according to customer specifications.
Therefore, the purchase of a REGATRON power supply is a solid investment for the future.

Characteristics and Features in the Basic Scope of the G5.SAS Series

Control Modes

CV constant voltage
CC constant current
CP constant power
CR constant resistance
Ri internal resistance simulation in CV
Gi internal conductance simulation in CC

G5.Control over Ethernet or USB

G5.Control allows complete and easy control of the power supply unit or entire master slave system and also offers a whole range of service functions. In addition to basic control, configuration and update functions, G5.Control has a powerful integrated 8-channel digital scope . The high-resolution real-time display of numerous internal system signals allows the engineer to optimize the overall system in a targeted manner. Different application specific settings of parameters for single devices or master slave systems can be saved on the devices and either recalled by G5.Control, an API or CAN message or digital I/O signals. Firmware updates can be carried out quickly and easily for individual units as well as for master slave systems with a single command. When handling support cases concerning the application of the power supplies, the built-in diagnostic functions help to quickly identify the problem.

Application Area Programming

The AAP application area programming feature allows to set the DC output voltage or current or power as a function of any of the input values IDC, UDC, or PDC. The functional relationship is given by a user-defined curve whose values are managed by CSV import/export. In this way, a wide variety of nonlinear electrical two-pole networks can be defined, e.g., photovoltaic arrays or fuel cell curves. The figure shows the typical fuel cell characteristics with a voltage/current dependence. Embedded calculation on board the G5.RSS assures real-time simulation.

G5.SASControl

REGATRON G5.SASControl is an application software specially designed for simulating solar arrays to test PV inverters in range from a few kW up to 5000+ kW. It is suitable for use in R+D laboratories and as well on test benches. The G5.SASControl software offers the user the possibility to test and qualify the solar inverters according to international standards. The advantages of the G5 PV simulation solution result from the combination of the G5.SASControl software together with the G5 power supplies. While the curves can be easily generated and monitored on the graphical user interface, the power supply takes care of the entire curve calculation and guarantees real-time computational processing with advanced accuracy, sampling rate and resolution. This feature is necessary for the compliant efficiency measurement procedures for maximum power point tracking (MPPT) of solar inverters as described in EN 50530.
Core of G5.SASControl is a versatile script programming system that gives the user the possibility to easily implement own programming sequences with one or more G5 devices or systems and to measure and protocol the resulting data.
G5.SASControl is the comprehensive software for all simulations, tests and evaluations in the field of PV inverter testing.

API .NET over Ethernet or USB

.NET programming, e.g., by LabView, Python, Matlab

WebAPI (REST) over Ethernet or USB

Interface via the optional HMI or RCU

I/O Port

The I/O interface features analog and digital signals used for set and actual values or operating states. Integrated into the user’s control system it is possible to set dynamically changing limits, to use enable signals, or trigger in or outputs. The possibility to activate up to 4 user defined parameter sets using digital inputs means that the system can be adapted to different EUTs. For example, predefined digital fuses and voltage limits can be set.

Insulation Fault Prevention YCD

To avoid an unintentional insulation fault triggering of the PV inverter, the YCD interface of the G5.SAS power supply allows to adapt the earth leakage resistance.

Grid Connection

The wide band AC input accepts all common AC grid systems and has an active power factor correction.