A method for active damping control of multiple converters connected in parallel
A damping control and converter technology, applied in the direction of converting AC power input to DC power output, output power conversion devices, electrical components, etc., to offset phase lag, improve stability, and enhance the effect of output impedance control.
Active Publication Date: 2019-10-29
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 a parallel active damping control method for multiple converters, which can solve the problem of system stability when multiple converters are connected in parallel. Each individual converter is controlled by a double current loop, in which the outer loop is the output current, and the inner loop realizes active damping; the characteristic of this method is: the current of the inner loop capacitor passes through the proportional link after sampling, and then delays The compensation link is added to the current control loop to achieve active damping; the expression of the delay compensation link is as follows: g p Used to adjust the gain of the whole frequency band; g r is the gain at the resonant frequency; ω c is the resonant frequency, take the switching frequency ω of the converter s ; θ is the leading phase angle, and the value is satisfied so that the delay compensation link is at the resonant frequency ω of the LCL network r The phase lead at 30°‑45°. The invention offsets the phase lag caused by the control delay by adding a phase compensation link, thereby enhancing the output impedance control effect of the power electronic converter.
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