Fault-tolerant control method for input-parallel output-series boost converter
An output series, fault-tolerant control technology, applied in the direction of converting DC power input to DC power output, output power conversion devices, control/regulation systems, etc., can solve problems such as less application research, achieve rapid diagnosis and recovery, and reduce faults The effect of testing costs
Active Publication Date: 2021-06-18
NORTHWESTERN POLYTECHNICAL UNIV
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Problems solved by technology
The feedback characteristics of the observer can make the model-based method get rid of the dependence on the accuracy of the system model, and the rough mathematical model can be used for fault diagnosis directly, but this method has fewer applications in the input series output parallel boost converter Research
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[0046] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:
[0047] The present invention proposes a fault diagnosis and fault-tolerant control method for an input parallel output series boost converter, comprising the following steps:
[0048] Step 1. Add an additional switching tube S on the basis of the original topology of the input-parallel-output-series boost converter 3 ,S 4 ; The switch tube S 3 The drain of the connected switch S 2 The drain of the switch tube S 3 The source connection of C 2 positive pole of the switch tube S 4 The drain of the connected switch S 1 The drain of the switch tube S 4 The source is connected to the switch S 2 the drain;
[0049] Step 2: Collect the voltage v across the capacitor c1 ,v c2 , the inductor current i L1 ,i L2 , and the converter input voltage v in ;
[0050] Step 3. Design the observer (detailed steps are as follows)
[0051] The state space equation of th...
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The invention relates to a fault-tolerant control method for an input-parallel output-series boost converter, and belongs to the field of direct-current converter control. An observer is designed, the observer obtains estimated values of input voltage through collected capacitance voltage signals and inductance current signals, and therefore whether a fault exists or not is judged; two switching tubes are added on an original topological structure of an input-parallel output-series boost converter, when a fault occurs, a fault signal drives the switching tubes to perform corresponding actions through an operational amplifier, and a converter system is converted into a traditional boost converter topology from the original input-parallel output-series boost converter; and according to the invention, fault detection of an open-circuit fault of a single switch tube of the input-parallel output-series boost converter can be realized, a specific faulty switch tube can be accurately positioned, and then topology reconstruction is carried out on the faulty converter, so that the system can still operate continuously after a fault occurs, and the fault-tolerant control method has rapid diagnosis and recovery capabilities.
Description
technical field [0001] The invention belongs to the field of DC converter control, in particular to a fault diagnosis and fault-tolerant control method for an input parallel output series boost converter. Background technique [0002] With the gradual depletion of fossil fuels, clean energy power generation systems such as wind power generation systems, photovoltaic power generation systems, and fuel cell power generation systems have received extensive research attention. In these renewable energy systems, DC-DC converters always play an important role in energy conversion. Since the input parallel output series converter can effectively reduce the input current ripple without increasing the voltage / current stress of the switching tube, it has been widely used in new energy systems and other fields. But it should be noted that when the DC-DC converter works under severe conditions, the failure of one component may cause the collapse of the entire system. In the literature...
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IPC IPC(8): H02M1/32H02M3/155
CPCH02M1/32H02M3/155
Inventor 马睿徐良材宋剑皇甫宜耿
Owner NORTHWESTERN POLYTECHNICAL UNIV