Active damping control method of multiple connectors in parallel
A damping control and converter technology, which is applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., to improve stability, enhance output impedance control effect, and offset phase lag effects.
Active Publication Date: 2018-06-15
西安费米人工智能有限公司
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[0005] In order to solve the problem of system stability when multiple converters are connected in parallel, the present invention proposes a new active damping control method
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[0028] Below in conjunction with accompanying drawing, the present invention is described in further detail:
[0029] figure 1 Shown is the circuit structure of multiple power electronic converters connected in parallel to the power grid. In the figure, the parallel power electronic converters are connected to the power grid at the same point, and all converter output filters use LCL networks, where L 1 is the converter side inductance, L 2 is the grid side inductance, C F is the filter capacitor. Z s is the line impedance between the public connection point and the grid, u g Represents the grid voltage source. The parallel connection of multiple power electronic converters can increase the output capacity; and the redundancy of multiple converters can improve the overall stability of the system.
[0030] The current control loop of a conventional power electronic converter is as figure 2 As shown, each individual power electronic converter is controlled by a double cu...
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The invention proposes an active damping control method of multiple connectors in parallel, and the problems of system stability when the multiple connectors are connected in parallel can be solved. Each independent converter employs dual-current loop control, an outer loop is an output current, and an inner loop is used for active damping. The method is characterized in that proportion link is performed on a current of an inner-loop capacitor after sampling, delay compensation link is also performed, a current control loop is added to achieve active damping, the expression of the delay compensation link is as follows: G<com>=g+g<r>Omega<c>{[scos(Theta)-Omega<c>sin(Theta)] / (s<2>+g<r>Omega<c>s+Omega<2><c>}g, g is used for adjusting gain of full frequency band, g<r> is gain of a resonant frequency, Omega<c> is the resonant frequency, a switch frequency Omega<s> of the converter is taken, Theta is a leading phase angle, and a value conforms to the condition that the phase of thedelay compensation link leads by 30-45 degrees at the resonant frequency Omega<r> of an LCL network. By adding the phase compensation link, phase lag caused by control delay is offset, and the outputimpedance control effect of a power electronic converter is improved.
Description
technical field [0001] The invention belongs to the multi-inverter parallel control technology, and in particular relates to an active damping control method, which is used to increase the stability of the system when a plurality of converters operate in parallel. Background technique [0002] With the rapid development of new energy power generation technology in recent years, the microgrid system has received more and more attention. The power electronic converter plays an important role in the field of energy generation. It is the link between the distributed energy source and the power grid, and undertakes the function of energy transmission. As the scale of distributed generation continues to increase, power electronic converters need to transmit more and more power. Using multiple power electronic converters in parallel can increase the power they transmit. However, considering the existence of grid impedance, multiple power electronic converters will be coupled with...
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IPC IPC(8): H02M7/493
CPCH02M7/493H02M1/0012
Inventor 阚忠杰阚啸李翔
Owner 西安费米人工智能有限公司