Simulators – Generate AC/DC Test Conditions with Precision

Simulators for AC/DC Test Benches, Grid Simulation, and PV Testing

Reproducing Grid Conditions for Testing

A grid simulator is the right choice when the behavior of a DUT needs to be tested beyond normal grid conditions.
Depending on the system, voltage, frequency, and waveform can be varied as required. This makes it possible to test conditions such as voltage dips, overvoltages, frequency deviations, or harmonics under repeatable conditions.
When selecting a suitable simulator, the first step is therefore to determine which grid scenarios are part of the test plan and which voltage and power ranges are required.
Depending on these requirements, the ITECH IT7900P Series may be a suitable solution.

Testing Regenerative DUTs Safely

If an inverter, energy storage system, or other DUT feeds power back during testing, a source-only system is not sufficient. The test setup must also be able to absorb the returned power.
For these applications, regenerative four-quadrant grid simulators can be used. They can supply the DUT and return absorbed energy to the utility grid.
For DUTs that only consume power, this function is usually not required. If the test setup needs to handle power flow in both directions, the Kewell G6000 Series, for example, can be used as a bidirectional four-quadrant solution.

Providing PV I-V Curves for Testing

For PV inverters, MPPT controllers, and other devices with a PV input, a PV simulator is required. It provides the I-V characteristic of a PV source and enables repeatable testing without PV modules and independently of current solar irradiance.
The main consideration is which I-V curves and operating profiles are required for the planned tests and whether the necessary voltage and power ranges are covered.
The additional I-V curves or time-dependent profiles that can be configured depend on the system and software used.
For this type of testing, the ITECH IT-N2100 Series is particularly well suited.

The Test Task Determines the Right Choice

Whether a grid simulator or PV simulator is required should always be determined by the specific test task.
What voltage and power levels occur? Which operating conditions need to be reproduced? Does the DUT feed power back? Once these points are clear, the appropriate product class and feature set can be selected much more precisely.

When Another Product Category Is the Better Choice

Not every test task requires a simulator. If only an adjustable AC or DC voltage is needed, a programmable power supply may be sufficient. If the DUT needs to be subjected to a defined load, an electronic load is usually the better choice. If the system must both deliver and absorb power, a bidirectional power supply may be more suitable.

FAQ – Frequently Asked Questions About Simulators

Which Simulator Is Right for the Test Task?

A grid simulator is used when tests require defined grid conditions. If the I-V characteristic of a PV source needs to be provided for a PV inverter or MPPT controller, a PV simulator is the appropriate choice.

When Is a Regenerative Grid Simulator Useful?

If the DUT feeds power back during testing, the grid simulator must be able to absorb that power. For DUTs that only consume power, this function is generally not required.

What Information Is Needed to Select a Simulator?

The most important factors are the test task, voltage, power, and the behavior of the DUT. From there, the required dynamic performance, test profiles, interfaces, and, where necessary, regenerative capability can be determined.

What Is the Difference Between a Grid Simulator and a Programmable AC Power Supply?

A grid simulator is designed to reproduce defined grid conditions and disturbances for testing. A programmable AC power supply is usually sufficient when only a controlled AC voltage or frequency is required.

Looking for the Right Solution for Your Test Bench?

Our team can help you identify the most suitable configuration from the available systems. Talk to us about your test application.