26-08-2021 дата публикации
Номер: US20210265906A1
Принадлежит:
A control device () for controlling a power converter () is configured to form a frequency droop value based on electric power supplied by the power converter to an alternating current system, decrease a frequency control value by the frequency droop value, form a power control value based on a target value of the electric power, increase the frequency control value by the power control value, and supply the frequency control value to the power converter to control alternating voltage frequency of the power converter. The electric power is driven to a value at which a combined effect of the frequency droop value and the power control value makes the alternating voltage frequency of the power converter to be the same as operating frequency of the alternating current system. Thus, the electric power can be controlled by changing the power control value. 2. The control device according to claim 1 , wherein the data processing system is configured to form the frequency control value according to the following formulas:{'br': None, 'i': f', '=f', '−Δf', '+Δf, 'sub': c', '0', 'droop', 'pc, ','}{'br': None, 'i': f', '=αp, 'sub': droop', 'act, 'Δ, and'}{'br': None, 'i': f', '=αp, 'sub': pc', 'ref, 'Δ,'}{'sub': c', '0', 'act', 'droop', 'ref', 'pc, 'where fis the frequency control value, fis a base value of the frequency control value, pis the electric power of the power converter, Δfis the frequency droop value, pis the target value of the electric power, Δfis the power control value, and α is a drooping coefficient for changing the frequency control value in accordance with the electric power.'}3. The control device according to claim 1 , wherein the data processing system is configured to limit a rate of change of the power control value (Δf) to be at most a predetermined upper limit of the rate of change.4. The control device according to claim 1 , wherein the data processing system is configured to compute a time integral of an error value proportional to a difference (p ...
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