Do PV inverters have stability problems on weak grid condition?

Institution of Engineering and Technology

Why is inverter stability important in PV power generation?

PV power generation, as one important kind of renewable energy, has been greatly developed. In PV systems, inverters are the crucial parts in energy transmission. Many works have been done about the analysis and improvement of inverters’ stability. The stability problem in and after the designing of inverters are two important topics.

How do different inverters affect system stability?

Different inverters will interact with each other and have the effect on every inverter's output voltage. The voltage of each inverter will then affect PLL and dc-link stability. The system stability will then become more complicated and how to derive the model and obtain an effective way to illustrate the stability is a challenge.

Do PV inverters have stability problems on weak grid condition?

The corresponding equivalent grid impedance is rather large and easy to lead to stability problems of grid-connected inverters and many researches have been done focusing on the stability problems. In this study, a survey of stability problems of PV inverters on weak grid condition is given.

Do solar photovoltaics use inverters?

Solar photovoltaics use inverters to interface with the AC power system. Inverters do not possess the rotational characteristics of synchronous generators. High instantaneous inverter penetrations complicate traditional stability approaches. Control techniques seen as the primary barrier to high inverter penetrations.

What are the barriers to high inverter penetrations?

Control techniques seen as the primary barrier to high inverter penetrations. Research indicates no fundamental challenges to high inverter penetrations. As power system renewable energy penetrations increase, the ways in which key renewable technologies such as wind and solar photovoltaics (PV) differ from thermal generators become more apparent.

Are grid-connected inverters stable?

However, most PV systems, especially the large PV plants, locate in rural areas. The corresponding equivalent grid impedance is rather large and easy to lead to stability problems of grid-connected inverters and many researches have been done focusing on the stability problems.