Photovoltaic inverter phase sequence identification method

How accurate is a photovoltaic ID mechanism?

Developed ID mechanism has higher accuracy than conventional techniques. Photovoltaic (PV) systems are increasingly assuming a significant share in the power generation capacity in many countries, and their massive integration with existing power grids has resulted in critical concerns for the distribution system operators.

How does a PV inverter work in failure mode?

In the failure mode, the PV inverter operates at point G 1 (actual operating point) when r = 0.042 Ω, and the DC voltage rises by 111 V. The PV inverter operates at G 2 when r = 0 Ω, and the DC voltage rises by 98 V. A noticeable difference of 11.7% exists between the two operating points.

How is a single-phase PV Grid-connected system simulated in MATLAB/Simulink?

Classifier training A single-phase PV grid-connected system is simulated in MATLAB/Simulink to identify normal and abnormal operating conditions. The inverter control strategy as discussed in Ref. is implemented to satisfy the load and operate the PV system in grid feeding/supporting mode.

Can LVRT test identify the parameters of a PV inverter?

In the case that the PV inverter control strategy and parameters are not disclosed, a method is proposed to realise the identification of the three types of parameters through the LVRT test. The method can solve the difficulty in performing the tests of Groups 2 and 3 parameters in the field.

Why do we need a dynamic model for photovoltaic systems?

With the increasing usage of photovoltaic (PV) generation systems, it is of great relevance to develop effective models to characterise the dynamic behaviours of actual PV systems under different failures and operation modes.

What is the operating condition of a PV inverter?

The operating condition of 0.35 pu H is regarded as an example to verify the necessity of the equivalent resistance r. Fig. 5 shows the PDC − VDC curves with r = 0 Ω and r = 0.042 Ω, respectively. In the failure mode, the PV inverter operates at point G 1 (actual operating point) when r = 0.042 Ω, and the DC voltage rises by 111 V.