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Current sharing control method and device
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A flow control and compensation control technology, which is applied in the direction of output power conversion device, AC power input conversion to DC power output, electrical components, etc., can solve the problem of large output voltage drop of the inverter
Active Publication Date: 2019-10-18
SICON CHAT UNION ELECTRIC CO LTD
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[0008] The present invention proposes a current sharing control method and device, which solves the problem in the prior art that when multiple inverters are connected in parallel and the PQ drooping control method is used for current sharing control, the inverter output voltage drops greatly
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Embodiment 1
[0094] Such as Figure 2-Figure 4 As shown, the present invention proposes a current sharing control method, including
[0095] S101: Obtain the operating data of a single inverter,
[0096] S102: Obtain the droop control component U according to the operating data of a single inverter ref1 ,
[0097] S103: Obtain the compensation control component U according to the operating data of a single inverter ref2 ,Compensation control component U ref2 And droop control component U ref1 The calculation method is the same,
[0098] S104: The droop control component U ref1 And compensation control component U ref2 Superimpose to reference voltage command U ref0 , Get the reference voltage command U of the single inverter voltage outer loop control ref * ,Specifically:
[0099] U ref * = U ref0 -U ref1 +U ref2
[0100] S105: According to the reference voltage command U ref * , Perform voltage outer loop and current inner loop control.
[0101] Based on the voltage outer loop control a...
Embodiment 2
[0130] Based on the same inventive concept as the current sharing control method in the first embodiment, the present invention also provides a current sharing control device, such as Figure 5 Shown, including
[0131] The first sampling unit is used to sample the operating data of a single inverter, including voltage U n , Current I n And frequency ω n ,
[0132] The first calculation unit is used to calculate the current I n Decompose in the dq coordinate system to get I d And I q ,
[0133] The second obtaining unit is used to obtain the I of multiple inverters d And I q , And according to the I of multiple inverters d And I q Calculation I davg And I qavg ,
[0134] The second calculation unit is used to calculate the I d And I q Calculate the droop control d-axis component U dref1 And droop control q axis component U qref1 ,
[0135] The third calculation unit is used for I of multiple inverters davg And I qavg Calculate the compensation control d-axis component U dref2 And...
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Abstract
The invention belongs to the technical field of inverter parallel, and proposes a current sharing control method and device. The current sharing control method comprises the steps of acquiring runningdata of a single inverter; obtaining a droop control component U<ref1> according to the running data of the single inverter; obtaining a compensation control component U<ref2> according to the running data of the single inverter; superposing the droop control component U<ref1> and the compensation control component U<ref2> to a reference voltage instruction U<ref0> to obtain a reference voltage instruction U<ref><*> of voltage outer ring control of the single inverter; and performing voltage outer ring and current inner ring control according to the reference voltage instruction U<ref><*>. Bythe technical scheme, the problem of large drop of an output voltage of an inverter during current-sharing control by a PQ droop control method when multiple inverters in the prior art are connectedin parallel is solved.
Description
Technical field [0001] The invention belongs to the technical field of parallel inverters and relates to a current sharing control method and device. Background technique [0002] Parallel operation of inverters can be an effective way to achieve large-capacity power supply and redundant power supply, and it is one of the important directions for the development of inverter technology today. The expansion of multiple inverters in parallel can greatly improve the flexibility of the system, greatly reduce the size and weight of the power system, and the current stress of its main switching devices can also be greatly reduced, which fundamentally improves reliability, reduces costs and Improve power density. When the output voltage amplitude of each inverter power supply is equal, the frequency is equal and the phase is the same, the voltage difference is zero, and parallel operation is the most ideal state. However, in the actual parallel inverter power supply system, due to the ...
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Application Information
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