Chapter 8. The first run
8. The first run
The device is intended for loading solar panels or / and a permanent magnet synchronous generator. The
system is equipped with the following energy conversion blocks:
• AC / DC / DC: diode rectifier with BOOST converter from the generator side,
• DC / DC: BOOST converter from the side of PV panels,
• DC / AC: active rectifier AcR (active rectifier) working from the side of the power grid (on-grid mode) or
local electrical loads (off-grid mode).
The BOOST converter enables obtaining electricity in a wide range of voltages: from 60 to 450 Vdc. The start
voltage is specified in the service parameter 1.20 The load for photovoltaic panels is based on the maximum
power point tracking algorithm (MPPT) implemented in the device, inverters with two PV inputs have two
independent tracking algorithms.
8.1. Maximum Power Point Tracking (MPPT) and Global Maximum Power Point Tracking (GMPPT)
PS100-PV and PS100-H inverters with PV input (DC voltage input) are using Maximum Power Point
Tracking (MPPT) algorithm. This algorithm constantly analyzes the voltage-current characteristic of a PV
panels and adjusting the load current in such a way as to obtain the greatest possible power from the system
- Fig. 8.1
Under the partial-shading condition, the voltage-current characteristic of a PV panels is different - instead of
having a single maximum power point (MPP), they exhibit multiple MPPs - Fig. 8.2. For this reason, in order
to work at the global maximum point, it may be necessary to enable the global maximum power point
tracking (GMPPT) algorithm, which will allow for greater efficiency of the system.
The user can set the GMPPT scan time in parameter 10.14. The optimal setting is 5 minutes.
Default the GMMPT is switched OFF.
It is recommended to use the GMPPT algorithm only under conditions of possible partial shading. If partial
shading does not occur, using the GMPPT algorithm will decrease overall system efficiency by up to 2%.
Fig. 8.1. Voltage-current characteristic – no shading
Fig. 8.2. Voltage-current characteristic – partial
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