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info@upspowersupply.net2 ways of Configuring UPS Power Supply System
The condition of UPS to achieve "N+1" redundant parallel operation
UPS's "N+1" redundant parallel operation technology is the key technology to improve the reliability and availability of UPS. The parallel connection of each UPS module must meet the following three conditions:
(1) The frequency, phase, phase sequence, voltage amplitude and waveform of the inverter modules of each UPS must be the same;
(2) The inverter module of each UPS must be able to achieve uniform distribution of active and reactive currents in the range of input voltage and load. For this reason, the dynamic response characteristics of the current sharing circuit are better and the stability is higher.
(3) When an abnormal situation occurs in the current sharing or synchronization or the inverter module of the UPS fails, the faulty module should be automatically detected and quickly removed without affecting the normal operation of other inverter modules. There are two key technologies: one is synchronous technology and the other is current sharing technology. The former mainly solves the consistency of the frequency, phase, waveform and phase sequence of each module, and the latter mainly solves the problem that the load modules uniformly bear the load power.
UPS parallel connection control method
The parallel connection of UPS is generally divided into centralized control, master-slave control, decentralized logic control, 3C connection control and no interconnection control according to its connection mode.
(1) Centralized control Centralized control can be divided into direct centralized control and indirect centralized control. In the direct centralized control mode, the parallel unit detects the frequency and phase of the mains, and sends a synchronization pulse to each UPS inverter. When there is no mains, the synchronous pulse generated by the crystal oscillator can be controlled by the phase-locked loop of each inverter unit to ensure each The unit output voltage is synchronized.
(2) Master-slave control The master-slave control mode is to connect the parallel control unit to each module, select one UPS module as the master through the working mode selection switch, and the other units to be slaves. Each UPS module unit detects the network status signal line and controls the closure of the switch by its internal master-slave flag. When one of the systems fails, the remaining units can still work. When the host has a problem, it can be switched, so that another UPS module continues to operate normally as the host system.
(3) Decentralized logic control Decentralized logic control is to decentralize control. When the inverter power supplies are operated in parallel, each power module detects its own active and reactive power, and transmits it to other parallel modules through the current sharing bus. At the same time, the power module itself receives active and reactive signals from other modules. Make a comprehensive judgment to determine the active and reactive reference of this module to determine the reference value of the voltage and synchronization signal (frequency and phase) of each module.
(4) 3C (CircularChainControl) connection The idea of 3C parallel connection is to reduce the number of interconnects and the transmission of signals to reduce the dependence on other modules. It is to add the output current feedback signal of the first switching power supply module inverter to the control loop of the second inverter, and the second output current feedback signal is applied to the third station and connected in turn. The last output current feedback signal is returned to the control loop of the first inverter, so that the parallel system forms a ring structure on the signal and forms a parallel relationship in terms of power output.
UPS's "N+1" redundant parallel operation technology is the key technology to improve the reliability and availability of UPS. The parallel connection of each UPS module must meet the following three conditions:
(1) The frequency, phase, phase sequence, voltage amplitude and waveform of the inverter modules of each UPS must be the same;
(2) The inverter module of each UPS must be able to achieve uniform distribution of active and reactive currents in the range of input voltage and load. For this reason, the dynamic response characteristics of the current sharing circuit are better and the stability is higher.
(3) When an abnormal situation occurs in the current sharing or synchronization or the inverter module of the UPS fails, the faulty module should be automatically detected and quickly removed without affecting the normal operation of other inverter modules. There are two key technologies: one is synchronous technology and the other is current sharing technology. The former mainly solves the consistency of the frequency, phase, waveform and phase sequence of each module, and the latter mainly solves the problem that the load modules uniformly bear the load power.
UPS parallel connection control method
The parallel connection of UPS is generally divided into centralized control, master-slave control, decentralized logic control, 3C connection control and no interconnection control according to its connection mode.
(1) Centralized control Centralized control can be divided into direct centralized control and indirect centralized control. In the direct centralized control mode, the parallel unit detects the frequency and phase of the mains, and sends a synchronization pulse to each UPS inverter. When there is no mains, the synchronous pulse generated by the crystal oscillator can be controlled by the phase-locked loop of each inverter unit to ensure each The unit output voltage is synchronized.
(2) Master-slave control The master-slave control mode is to connect the parallel control unit to each module, select one UPS module as the master through the working mode selection switch, and the other units to be slaves. Each UPS module unit detects the network status signal line and controls the closure of the switch by its internal master-slave flag. When one of the systems fails, the remaining units can still work. When the host has a problem, it can be switched, so that another UPS module continues to operate normally as the host system.
(3) Decentralized logic control Decentralized logic control is to decentralize control. When the inverter power supplies are operated in parallel, each power module detects its own active and reactive power, and transmits it to other parallel modules through the current sharing bus. At the same time, the power module itself receives active and reactive signals from other modules. Make a comprehensive judgment to determine the active and reactive reference of this module to determine the reference value of the voltage and synchronization signal (frequency and phase) of each module.
(4) 3C (CircularChainControl) connection The idea of 3C parallel connection is to reduce the number of interconnects and the transmission of signals to reduce the dependence on other modules. It is to add the output current feedback signal of the first switching power supply module inverter to the control loop of the second inverter, and the second output current feedback signal is applied to the third station and connected in turn. The last output current feedback signal is returned to the control loop of the first inverter, so that the parallel system forms a ring structure on the signal and forms a parallel relationship in terms of power output.
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