Abstract
Photovoltaic (PV) power grid-connected systems have the advantages of being prompt and reliable supplies of electrical power. Nevertheless, the installation and operation requirements from the grid side have to be fulfilled in order to guarantee the security of the PV system technicians and the efficiency of the power system. Particularly, the potential for “islanding” is one of the dreads that are brought about by PV grid-connected systems. To be able to tackle these concerns, this paper investigates recent islanding detection techniques and topologies for PV systems. Active islanding detection techniques apply regular disturbances to the inverter system and then analyze the output voltage or frequency to investigate the islanding and stability of the grid. If the injected disturbances influence the load voltage or frequency, the controller forces the intermediate inverter to stop sending power to the connected load. In addition, several islanding detection techniques that inject a periodical signal to the reference current that causes a change in the magnitude of inverter output voltage when islanding happens in a three-phase photovoltaic grid-connected system are discussed. The validity of the proposed technique is tested and verified through PSIM software.
Highlights
The distributed generation (DG) system has witnessed increasing contributions in the field of power generation all over the world
This paper introduced and analyzed several recent islanding detection methods for grid-connected PV systems
The research trend of anti-islanding is mainly divided into passive methods, which are based on the measurement of system parameters such as voltage and frequency
Summary
The distributed generation (DG) system has witnessed increasing contributions in the field of power generation all over the world. This method has several advantages: it is simple, viable, and has a high detection accuracy It doesTnhoist minefltuheondcheatshseevpeorwaleardqvuaanltiatygeasn: dit itshseimdeptleec, tvioianblrea,nagned ihsaws aidhei;gthhdeecthecatniogne aocfcuthreacdy.etIetcdtoioens nefoftecint flisuennocteytehteipnvowesetirgqauteadlituynadnedr tthhee dpeatreacltlieolnorpaenrgateioisnwcoidned;itthioenchoafntghee oinf vtheertderest;ecthtieoniselafnfedcitnigs ndoetteycetitoinnvdeusrtiinggattehdeupnodweerrtmheaptcahrawlliethl oapleoraadtioisnstciollnvdeirtiyohnigohf .the inverters; the islanding detection durinTghtehde ipsaodwvearnmtaagtecshowf itthhisamloeatdhoisdsatirlel vaesrfyolhloigwhs.: a large amount of network voltage harmonics due tTohtehde insaodnv-lainnetaagr elosaodf tchaiussmesesthigondifaicraenatslifmoliltoawtiso:nas laanrgdedaimffiocuulnttieosfinneptwraocrtikcev.oTlthaigsemheatrhmodonhicass danueNtDo Zth[e1n5]o.n-linear load causes significant limitations and difficulties in practice. This method has an NDZ [15]. The effectiveness of phase monitoring is not affected when the parallel inverters are connected to the islanded system [9]
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