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A stability or resonance analysis of a micro-grid consisting of multiple grid-connected-converters (GCC) with LCL filter is important but complicated, because it is influenced by many factors such as LCL filters of the GCC, the grid impedance and various (nonlinear or even time-variable) loads. It is necessary to construct a framework for revealing and analyzing the main unstable factors and then...
Under unbalanced grid voltage conditions, negative-sequence will generate the double fundamental frequency in the dq synchronous rotating reference frame. In order to detect the positive-sequence component of the grid voltages fast, this paper proposes a new phase-locked loop method, called double fundamental frequency phase-locked loop (DFF-PLL). The operation principle is analyzed, giving the extract...
Software Phase-Locked-Loop (SPLL) is a kind of servo mechanism to adjust system's output synchronized with one reference signal. The polluted grid voltage is not only unbalanced, but also contains large quantities of low order harmonics. In this case, SPLL still can obtain fundamental positive sequence component (FPSC) effectively and realize synchronization with grid rapidly and accurately, that...
Since low voltage ride-through (LVRT) was proposed, its improvements have never been stopped, especially the improvements for operation under unbalanced faults. In this paper, an overall control strategy is proposed to solve the problem that the output current quality and dc-link voltage quality cannot be guaranteed at the same time. For this propose, a current control method is employed to guarantee...
Voltage-controlled inverters are grid-friendly and can cope with the high penetration caused by connecting a lot of distributed generations. In low voltage power systems This paper proposes a simple and precise PQ control strategy based on improved voltage-controlled inverters with inner output impedance. The PLL part is replaced by second order generalized integrator method and it performs well when...
Grid-connected inverter is a key electrical unit for photovoltaic generation system. In this paper, the architecture and its advantages of a single phase photovoltaic grid-connected inverter based on DSP + ARM dual-core control are studied. The novel maximum power point tracking (MPPT) control based on extremum seeking control (ESC) algorithm is used in the proposed system, and the speediness and...
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