Control method of composite impedance adapter system
A control method and adapter technology, applied in the direction of AC network circuits, electrical components, circuit devices, etc., can solve the problem of not considering the resonance and harmonic suppression effects of multi-inverter grid-connected power generation systems, and the limited ability of grid-connected systems to suppress resonance. Low frequency resonance suppression effect is not good and other problems, to achieve the effect of suppressing resonance and harmonic amplification, small harmonic impedance, and good absorption function
Active Publication Date: 2019-01-08
HEFEI UNIV OF TECH
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[0014] (1) The current-mode impedance adapter proposed above, due to its own stability limitation, in the case of weak power grid, it is difficult for the current-mode impedance adapter to achieve a smaller virtual harmonic impedance, and the resonance suppression effect on the low frequency band is not good. OK, so its ability to suppress resonance of grid-connected systems is limited
[0015] (2) The impedance adapters studied above are limited to the current-mode mode, and the resonance and harmonic suppression effects of other forms of impedance adapters on multi-inverter grid-connected power generation systems are not considered
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[0042] In this example, two grid-connected inverters, a voltage-type impedance adapter and a current-type impedance adapter in a simulation software Matlab / Simulink constitute a resonance suppression system connected by a multi-inverter grid-connected power generation system and a composite impedance adapter system As an example, a control implementation method of a composite impedance adapter in a multi-inverter grid-connected power generation system is illustrated. The steps of this embodiment are as follows.
[0043] figure 1 It is a topological structure diagram of the composite impedance adapter system in the embodiment of the present invention. It can be seen from this figure that the composite impedance adapter system proposed by the present invention includes a current-type impedance adapter and a voltage-type impedance adapter. At the coupling point, the voltage-type impedance adapter is composed of a voltage source converter, connected in parallel at the public cou...
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The invention provides a control method of a composite impedance adapter system. The control method of the invention comprises the following steps: respectively sampling voltage and current of a current-type impedance adapter and a voltage-type impedance adapter; Current-mode impedance adapter and voltage-mode impedance adapter are realize by setting virtual harmonic impedance to obtain virtual harmonic current command value and virtual harmonic voltage command value respectively, and PWM modulation wave is obtained through current and voltage controller respectively, so as to realize no-difference tracking of command value. The invention discloses a control method of a composite impedance adapter, Through the combination of current-mode impedance adapter and voltage-mode impedance adapter, the virtual harmonic impedance function is realized, and the grid-connected impedance of multi-inverter power generation system is reshaped and adapted, which effectively suppresses the resonance and harmonic amplification of the system in wide frequency domain, and the harmonic absorption function of multi-inverter grid-connected power generation system is remarkable.
Description
technical field [0001] The invention relates to a control method of a composite impedance adapter system in which a current type impedance adapter and a voltage type impedance adapter are combined. Background technique [0002] In recent years, renewable energy grid-connected power generation systems represented by photovoltaic and wind power have developed rapidly. However, the equivalent grid impedance formed by non-negligible distributed parameters in transformers and long-distance transmission lines in the multi-inverter grid-connected power generation system may cause the failure of the inverter damping strategy, thereby stimulating the gap between the multi-inverter grid-connected power generation system and the grid. resonance between them. In addition, the multi-inverter grid-connected power generation system is often in a weak grid environment, and the grid impedance amplitude changes greatly, so that there is a strong coupling between the inverter and the grid imp...
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IPC IPC(8): H02J3/38H02J3/24
CPCH02J3/24H02J3/381H02J2203/20
Inventor张兴周文翔李飞刘朋王艺潮谢震
OwnerHEFEI UNIV OF TECH