摘要:
Disclosed in the present invention are a fast bus transfer method and device to reduce, by transferring between a main power supply and a backup power supply, the impact on a load connected to a bus caused by a power cut. The method comprises: 1) calculating the amplitude of the voltage vector difference between the bus and the backup power supply and the phase angle difference between the bus and the backup power supply; 2) transferring the load on the bus to said backup power supply only when the amplitude is less than its limit value and the phase angle difference is less than 90°. The device comprises: a detection module; a calculation module; a comparison module; and a transfer module. By calculating the real-time residual voltage, it is unnecessary for a user to know all the details of the residual voltage characteristic, and he/she can easily achieve fast transfer simply by setting the limit of the voltage difference at the moment when a circuit breaker of the backup power supply is closed.
摘要:
The invention concerns a method for determining the amplitude and angle of phase of a measuring signal corresponding to the current or the voltage of an electric power distribution system by means of scanning values of the measuring signal. The amplitude and the phase of the measuring signal are calculated using the least square recurrence method applied to a model of the measuring signal containing at least a sinusoidal part, and using the scanning values. In order to determine the frequency at the same time as the amplitude and angle of phase, the method consists in using a model of the signal according to the relationship y = A . sine(2π ft + ζ), and in applying the non-linear least square root recurrence method with said model and the scanning values (ym) to determine the measuring signal frequency (um). By extending the signal model, the measuring signals with a continuous component and variable frequencies can be analysed.
摘要:
The invention relates to an automation system comprising at least one device (2a, 2b, 2c) that detects measured values and is connected to a automated process (1), at least one field device (5, 6) which is connected to the at least one device (2a, 2b, 2c) detecting measured values, and a master computer (7) that is connected to the at least one field device (5, 6). In order to simplify the design of such an automation system as much as possible, the at least one device (2a, 2b, 2c) detecting measured values, the at least one field device (5, 6), and the master computer (7) are connected to a common data transmission network (3) which is equipped for transmitting digital measured data from the at least device (2a, 2b, 2c) detecting measured values to the at least one field device (5, 6) according to a first communication protocol and transmitting digital control data between the at least one field device (5, 6) and the master computer (7) according to a second communication protocol.
摘要:
Disclosed in the present invention are a fast bus transfer method and device to reduce, by transferring between a main power supply and a backup power supply, the impact on a load connected to a bus caused by a power cut. The method comprises: 1) calculating the amplitude of the voltage vector difference between the bus and the backup power supply and the phase angle difference between the bus and the backup power supply; 2) transferring the load on the bus to said backup power supply only when the amplitude is less than its limit value and the phase angle difference is less than 90°. The device comprises: a detection module; a calculation module; a comparison module; and a transfer module. By calculating the real-time residual voltage, it is unnecessary for a user to know all the details of the residual voltage characteristic, and he/she can easily achieve fast transfer simply by setting the limit of the voltage difference at the moment when a circuit breaker of the backup power supply is closed.
摘要:
The invention concerns a method for determining the amplitude and angle of phase of a measuring signal corresponding to the current or the voltage of an electric power distribution system by means of scanning values of the measuring signal. The amplitude and the phase of the measuring signal are calculated using the least square recurrence method applied to a model of the measuring signal containing at least a sinusoidal part, and using the scanning values. In order to determine the frequency at the same time as the amplitude and angle of phase, the method consists in using a model of the signal according to the relationship y = A . sine(2 pi ft + phi ), and in applying the non-linear least square root recurrence method with said model and the scanning values (ym) to determine the measuring signal frequency (um). By extending the signal model, the measuring signals with a continuous component and variable frequencies can be analysed.