About The photovoltaic inverter voltage is unstable
This letter presents records of unstable operations in grid-connected photovoltaic generation plants. The instabilities involve a wide range of frequencies from tens to thousands of Hertz. Possible causes of the instabilities are discussed based on the literature survey.
This letter presents records of unstable operations in grid-connected photovoltaic generation plants. The instabilities involve a wide range of frequencies from tens to thousands of Hertz. Possible causes of the instabilities are discussed based on the literature survey.
In general, the input signal of PLL is the inverter output voltage Vpv as shown in Fig. 2b. Without grid impedance (strong grid), Vpv = Vg, the input signal of PLL is directly grid voltage Vg. Under this circumstance, the inverter output current Ipv has no influence on PLL.
Three static techniques (i.e. Power flow, Continuation Power Flow (CPF) and the Q–V curve) are used to assess the voltage stability of the power grid with a Solar Photovoltaic Generator.
In fact, there is a close connection between the photovoltaic power generation capacity and the grid voltage. The power generation capacity gap between regions with extremely unstable voltage and regions with stable voltage is around 10% to 20%. This paper mainly discusses the influence of the grid voltage on the system.
The stability problems are mainly divided into two parts, i.e. the control loops instability and inverter output voltage instability. The control loops cover the current loop and dc voltage.
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