Parallel control method for inverter and inverter therefor
A control method and inverter technology, applied in the direction of power transmission AC network, single network parallel feeding arrangement, etc., can solve the problems of poor anti-interference ability of signal lines, high system cost, low reliability of parallel system, etc.
Active Publication Date: 2012-08-22
VERTIV CORP
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Problems solved by technology
[0008] The technical problem to be solved by the present invention is to overcome the poor anti-interference ability of the signal line transmitting the load average current analog signal between parallel systems in the prior art, which is easy to generate control errors, and the system cost is high due to the need for a large number of current transformers And the defect of low reliability of the parallel system provides a method for parallel control of inverters
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[0050] The design concept of the present invention is that in the parallel inverter system, each inverter samples and processes the output of the inverter, and combines the output sampling information of other inverters to obtain the output of the inverter through calculation and processing. output control. In the present invention, the information between inverters is transmitted in the form of digital signals, which are less affected by the external environment. For example, as an option, the transmission of the signal can be via a wired connection or a wireless connection.
[0051] In an embodiment of the invention, each inverter is connected to a control unit. Such as figure 1 As shown, the inverter 10 is connected with an inverter control unit 12 and an inverter parallel control unit 14 . The inverter control unit 12 and the inverter parallel control unit 14 sample from the output of the inverter, and the inverter parallel control unit 14 processes the sampling informa...
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The invention provides a parallel control method for an inverter, which is used for controlling the output voltage amplitude, phase and direct current component of the output voltage of all inverters in the inverter parallel system which comprises a plurality of inverters so as to average the loads. The method comprises the steps as follows: the transient output active power and reactive power of the inverter are sampled, calculated and filtered; the output active power and reactive power filter value is transmitted between the inverter parallel systems and the average value of the output active power filter value and reactive power filter value of the inverter parallel system; the voltage amplitude adjusting signal Delta V and an angle adjusting signal Delta Theta controlled by the inverter with equivalent current are generated; the output voltage amplitude and the transient given value Vref' and Theta<reg>' of angle of the inverter are obtained; and subsequently, the control given value Vdcref of the output voltage direct current component of the inverter is obtained. The method is used for controlling the parallel system of the inverter, improves the anti-interference capability of the system, greatly reinforces the reliability of the system and simultaneously reduces the hardware cost of the system.
Description
technical field [0001] The invention relates to a UPS power supply, in particular to an inverter parallel control method and device. Background technique [0002] With the development of information technology (IT) technology, IT equipment has higher and higher requirements on the reliability of power supply. In order to meet the high requirements of IT equipment for power supply, large-capacity uninterruptible power supply (UPS) generally adopts parallel redundant mode to increase the reliability of the system. [0003] In the parallel system of UPS, in order to ensure the reliable operation of the system, each UPS in parallel is required to share the load current equally. In the traditional parallel connection method of UPS inverters, in order to achieve the purpose of sharing the load current, an analog signal line of load average current is required between the parallel UPSs, and each inverter samples the load current output by the module in real time and The load aver...
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Login to View More IPC IPC(8): H02J3/36H02J3/46
CPCY02E60/60
Inventor 舒州马春红周党生
Owner VERTIV CORP