Abstract
In order to realize the unbalanced power optimally allocated and the DC voltage stably controlled after disturbance, an adaptive droop control method considering power and voltage deviation is proposed based on the traditional voltage–power droop control of a voltage source converter-based multi-terminal direct current (VSC-MTDC) distribution network. The inherent constraint that the unbalanced power is proportionally distributed according to its capacity under the traditional droop control is broken in the proposed method to realize the reasonable transfer of unbalanced power and to reduce the overload risk of smaller capacity VSCs; the “dead zone” is appropriately set to relax the operating range of the VSC to a certain extent by a power deviation factor being introduced in the droop characteristic curve. The corresponding MATLAB/Simulink simulation model of the five-terminal DC power distribution network is established and compared with the electromagnetic transient model under the traditional droop control. Finally, the simulation results verify the effectiveness and control effects of the proposed control method.
Highlights
The continuous maturity of flexible DC equipment and control technologies in the field of electricity transmission has greatly promoted the development of DC power distribution (Li and Lao, 2017; Liao et al, 2018)
This article proposes an adaptive droop control strategy of the VSC-MTDC power distribution network taking into account the power–voltage deviation, which can improve the response capability to DC power flow disturbance and at the same time can realize the isochronous control of DC voltage
The adaptive drooping characteristic optimization method considering power–voltage deviation is applied to the VSC-MTDC distribution network
Summary
The continuous maturity of flexible DC equipment and control technologies in the field of electricity transmission has greatly promoted the development of DC power distribution (Li and Lao, 2017; Liao et al, 2018). This article proposes an adaptive droop control strategy of the VSC-MTDC power distribution network taking into account the power–voltage deviation, which can improve the response capability to DC power flow disturbance and at the same time can realize the isochronous control of DC voltage. In the limiting range of the droop coefficient K’droopi, all poles are in the left half of the complex plane and on the real axis, so the VSC-MTDC power distribution network is always stable, and the system stability is independent of the inner and outer loop control coefficients and the power and voltage reference values. Because of the addition of the DC voltage deviation control in the droop characteristic, the ability to restore the system’s stable state obviously enhanced, the time consumption is about 0.39s, and the peak value of the DC bus voltage fluctuation during the period is 14.70V, accounting for 1.96% of the rated voltage
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