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Harmonic power can be shared by controlling the equivalent harmonic impedance of distributed generation (DG) units in islanded microgrids. This paper firstly reviews several methods for controlling the equivalent harmonic impedance of DGs and adopts the method based on resistive active power filter (R-APF). Then, a droop relationship between the equivalent harmonic impedance of DGs and their remaining...
This paper proposes a new control scheme for harmonic power sharing and PCC voltage harmonics compensation in islanded microgrids by adopting virtual harmonic impedance method. Firstly, a droop relationship between the equivalent harmonic impedance of distributed generation (DG) units and their remaining power capacities (ZDG_h_eq-SDG_remaining droop relationship) is put forward. Then, a virtual harmonic...
Microgrid consists of various micro sources, power electronic devices, and constant power loads (CPLs), because of which, there is a stability problem in such system. Therefore, stability analysis must be taken into consideration regardless of in the design or in the operation of microgrid. In this paper, the method modeling the CPLs in AC system is analyzed. A small signal state-space model of microgrid...
The frequency and voltage droop control is one important method which can deal with power sharing problem and realize “plug and play” function in microgrid. But it is subject to the power coupling and steady-state reactive power sharing error when employed in low voltage microgrids. Furthermore, complex microgrid configurations often make the power sharing more challenging. In this paper, an accurate...
Harmonic impedance is the important parameter to analysis the stability of power system. Through theoretical analysis calculated the impedance parameters of microgrid. A microgrid model is developed in PSCAD. The theoretical value and measured value have been comparative and analysis. The simulation result demonstrates that the measurement method is valid to measure the harmonic impedance of microgrid.
Stability analysis is very important in the design and in the operation of microgrid, because microgrid always contains many Distributed Generations(DGs), power electronic converters and constant power loads. Harmonic impedance is a useful parameters in the stability analysis. In this paper, the structure of microgrid is introduced detailed. The control strategies of inverter operating in different...
Harmonic impedance is the important parameter to analyze the stability of power system. In the microgrid, due to the existence of power converters with constant power characteristics which may result in negative impedance and thus decreases the system stability, harmonic impedance measurement is also of great significance. In this paper, the droop control strategy for parallel inverters in microgrid...
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