摘要:
Control method for an electronic DC/AC converter (1), wherein for at least one phase: calculating a first reference voltage (er,v, es,v, et,v) from predefined voltage setpoints (22) and a phase voltage (Vcr, Vcs, Vct); calculating a second reference voltage ( er,ipos,es,ipos,et,ipos) based on a difference between a predefined upper current limit (Imax) and the current (ir, is, it) of said at least one phase, and on the phase voltage ; calculating a third reference voltage ( er,ineg,es,ineg,et,ineg) based on a difference between a predefined lower current limit (-Imax) and the current of said at least one phase, and on the phase voltage; comparing the first reference voltage (er,v, es,v, et,v) with the second reference voltage ( er,ipos,es,ipos,et,ipos); selecting the lowest voltage of the two; comparing the selected reference voltage with the third reference voltage ( er,ineg,es,ineg,et,ineg) selecting as the control voltage (er,s, es,s, et,s) the highest of the two; and applying the selected control voltage (er,s, es,s, et,s) to the at least one phase of the converter.
摘要:
The invention relates to a power conversion system and an associated control method. The system comprises a plurality of converters (3) connected in parallel on an AC side, each converter (3) comprising an AC side (3A) for being coupled to a power grid (G), a DC side (3C) for coupling to a direct-current source (200), and a first terminal (1) and a second terminal (2) on said DC side (3C). The outputs on the AC side (3A) of all the converters (3A) are connected to a common output point, the first terminals (1) of the various converters (3) of the system (100) being earthed, and the second terminals (2) of said converters (3) being independent from one another. Thus, each source (200) is adapted and configured to operate independently of the rest of the sources (200).
摘要:
Optimizes the operation and control of electric generators against events produced in the power grid, such as voltage dips or overvoltages, comprising the following steps: detecting that the DC bus voltage level (V bus ) (301) exceeds the maximum operating limit established in normal conditions; enabling activation permission of the chopper (201); activating the different operating states (304) of the chopper (201) according to the DC bus voltage level (V bus ) (301) and to the current entering the DC bus (I in.bus ) from the generator; detecting that the DC bus voltage level (V bus ) (301) is within the normal operating range; enabling deactivation permission of the chopper (201); deactivating the different operating states (304) of the chopper (201) according to the DC bus voltage level (Vbus) (301) and to the current entering the DC bus (I in.bus ) from the generator.
摘要:
Control method for converting power in which a DC voltage is converted into alternating voltage, a first alternating voltage (AC1) and a second alternating voltage (AC2) being obtained by means of a first inverter (1) and a second inverter (2) respectively. Said alternating voltages (AC1, AC2) are combined in parallel, a resulting alternating voltage (AC12) being obtained. An additional resulting alternating voltage (AC34) is also generated, converting the DC voltage into alternating voltage, an additional alternating voltage (AC3) and another additional alternating voltage (AC4) being obtained by means of a first additional inverter (3) and a second additional inverter (4) respectively, and combining in parallel said additional alternating voltages (AC3, AC4). The additional resulting alternating voltage (AC34) is displaced in phase approximately 180° in relation to the resulting alternating voltage (AC12). Thanks to said method the common-mode voltages are also eliminated from at least one of the alternating voltages.