The GFM APP is a complete development platform integrating all components required for Grid-Forming inverter R&D and product development.:

Includes the PE-Expert4 controller, inverter, battery simulation power supply, isolation transformer, and pre-configured control software.

It uses PE-Expert4, which has a proven track record in power electronics R&D.

The program for GFM-required functions—droop control, inertial droop control, virtual synchronous generator control, and GFL control—is implemented as dedicated GFM APP control software.

As the dedicated GFM APP program is pre-installed, eliminating the need to develop control software from scratch.

Real-time parameter tuning enables immediate evaluation of system behavior. such as carrier frequency and control gains, as well as the impact on active power control and other functions.

Modify only the required control parameters for rapid validation and testing, you can achieve rapid operation verification, which helps shorten the development period.

Example configuration using dual grid-connected inverters.

The standard configuration uses one inverter. (Up to three inverters can be used.)

The control system used in the GFM APP consists of the PE-Expert4 controller and the PE-ViewX integrated development environment, both with a proven track record in numerous research and development applications within the power electronics industry.

Equipped with a high-performance DSP, it can be used for basic system control.

Development efficiency is improved by enabling rapid customization of the pre-configured control software. ※ because code can be added or modified based on the dedicated program for the GFM APP.

※ It is also possible to create control program from scratch.

Step changes in system frequency can be applied to evaluate active power response. and check the active power output. Parameters can be easily adjusted after control verification as needed.

The active power output changes according to the droop control.

When the frequency drops:

• The grid is short of power, so the inverter increases active power output.
• The grid has excess power, so the inverter decreases active power output.

Verify virtual inertia response behavior during transient events.

• The large power fluctuation (transient response) at the moment the frequency changes is correctly implemented.

We have prepared four types of control program that can be used for GFM-related products and research and development.

Explanations of each control method are included, allowing you to proceed with verification while deepening your understanding.

GFM is a promising technology for stabilizing power grids in the renewable energy era.

Although GFL remains widely adopted due to its implementation simplicity, virtual inertia can also be implemented with GFL.

Here, we once again provide a comparative explanation of GFM and GFL.

This product also allows verification of GFL control operation.

By understanding the challenges associated with reduced system inertia and clarifying the application objectives and evaluation metrics for GFM and GFL, you can accelerate the pace of your research and development.

As renewable energy becomes more widespread, GFM—with its structural synchronizing power that supports the power grid—is expected to be an indispensable technology in the future.

If EV chargers equipped with GFM capabilities become widely adopted, EV charging stations will evolve from mere power-consuming facilities into distributed energy resources that actively support grid stability. Thanks to autonomous voltage/frequency formation and VSG control, stand-alone operation and black-start capability will become possible in the future.

Furthermore, GFM is expected to contribute to grid stabilization amid large-scale renewable integration, as well as maintaining and adjusting power supplies during disasters.

*While no institutionalization or mandatory requirements for practical implementation have been decided, research and development are underway to enhance the value contribution of renewable energy.

Following verification with the GFM APP, our company also supports large-capacity simulation close to real-hardware testing conditions for those who wish to conduct grid tests at a large scale.