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4.Functions

4.1 escriptionBrief D

4.2 Safety Features

4.3 Control

The GSI is a single phase grid-tied PV inverter, which is unlike to the stand-alone

To ensure the safety of personnel, GSI has an internal leakage current monitoring

GSI provides the following inverter control functions :

1.Parameter Monitoring (voltage, current, frequency).

2.Utility grid synchronization.

3.Maximum Power Point Tracking (MPPT).

4. Input and output current limiting.

5.Temperature monitoring.

6.Graphic display.

7.Communication (through RS485 interface).

system. When a failure occurs and leakage current is present, the system will

activate and detach connection to the utility grid. Whether under intentional or

unintentional contact, this protection mechanism will trigger to prevent electrical

shock.

PV inverter in the sense that it does not need an external battery, which is expensive

and bulky; furthermore reducing the sizeable cost of maintaining this battery. The

GSI can effectively convert photovoltaic DC power harvested from the PV module

to AC power which is fed back to the utility grid, reaching the goal of generating

and conserving energy. The control unit employs digital signal processing (DSP),

using advanced digital control methods and algorithms to increase converting

efficiency and provide additional features. Power-level circuitry utilizes single

stage high frequency switching IGBT, which has the merit of simple structure and

high efficiency. PV inverter system can be remotely controlled by software, providing

the user with convenient means of power monitoring and data collection without

an additional monitoring system.

5% 10% 15% 20% 25% 30% 50% 70% 100%

400VDC

380VDC

300VDC

250VDC

Figure 4-1 Efficiency characteristic curve

4.4 Efficiency

1 2 3 4 5 6 7 8 9 10 11 12 13 ... 32 33

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PV Powered 4600 Betreibershandbuch Seite 8