Distributed voltage-sharing control method for modular ISOS combined system

A combined system, equalizing control technology, applied in control/regulating systems, instruments, regulating electrical variables, etc., can solve the impact of lack of independence, system redundancy, reliability and scalability, ISOS combined system modularization problems such as low level, to achieve the effect of high system redundancy

Inactive Publication Date: 2013-11-27
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The common feature of the above-mentioned voltage equalization control strategies is that each module shares the control circuit, lacks independence among the modules, and the modularization degree of the ISOS combination system is not high, which affects the redundancy, reliability and scalability of the system

Method used

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  • Distributed voltage-sharing control method for modular ISOS combined system
  • Distributed voltage-sharing control method for modular ISOS combined system
  • Distributed voltage-sharing control method for modular ISOS combined system

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Experimental program
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Effect test

Embodiment 1

[0028] Embodiment 1: The input and output voltage equalization / current equalization control of the multi-converter ISOS system is very important. Each converter module has the same linear input and output characteristics, and it is a proportional linear relationship, which is the so-called upward warping characteristic. like figure 1 As shown, an ISOS system includes N converter modules, and each converter module has a control module. The control module samples the input voltage of the module and the output voltage of the system in real time, and performs corresponding calculation and control to realize voltage equalization control. The control module also includes a capacitor connected in parallel at the input end of the converter module.

[0029] The control method of the present invention will be explained in detail below. Assume that due to external disturbances, the module input voltage Vin1 of the first converter module decreases, while the module input voltage Vin2 of ...

Embodiment 2

[0037] Embodiment 2: as Figure 9 As shown, in this embodiment it is still assumed that due to external disturbances, the module input voltage Vin1 of the first converter module decreases, while the module input voltage Vin2 of the second converter module increases, and the system output voltage Vo remains unchanged. The difference between the first input sampling signal and the output sampling signal Vof is firstly obtained, and the obtained result is the difference signal Vof1 of the first module. The first module calculates the difference signal Vof1 and then calculates the difference with the reference signal Vref, and generates an adjustment signal according to the difference result. The adjustment signal is transformed by the output voltage adjustment function Gvo to adjust the duty of the PWM wave output to the converter. Ratio to reduce the input power, that is, Iin1 decreases, Icd1 increases, so that the voltage across the first capacitor Cd1 increases, that is, the m...

Embodiment 3

[0039] Embodiment 3: This embodiment adds an output voltage correction link on the basis of Embodiment 1, namely Figure 10 The dotted box part in each converter module. The first converter module first samples the module input voltage Vin1 of the first converter module according to the input sampling coefficient k to obtain a first input sampling signal. For the system output voltage Vo according to the output sampling coefficient k vo Sampling is performed and an output sampling signal Vof is obtained. Then subtract the reference signal Vref from the output sampling signal Vof and then perform sampling according to the sampling coefficient Kvc to obtain the first output voltage correction signal Vc1. Then the first input sampling signal is added to the reference signal Vref, and then compared with the first output voltage correction signal Vc1 to obtain the first module reference voltage Vref1, and finally the output sampling signal Vof is compared with the first module re...

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Abstract

The invention discloses a distributed voltage-sharing control method for a modular ISOS combined system. The distributed voltage-sharing control method comprises the steps of: calculating a module input quantity, a reference signal and a system output quantity of each convertor module respectively and independently, so as to judge whether the convertor module deviates from a steady state operating point; and regulating the input power of one convertor module when an operating point of the convertor module deviates from the steady state operating point, so as to force the operating point of the convertor module to return to the steady state operating point, thereby realizing the voltage-sharing control. According to the distributed voltage-sharing control method for the modular ISOS combined system provided by the invention, the control circuits are distributed into the converter modules, so that the power circuits and control circuits of the converter modules are identical and can work independently, in addition, the voltage-sharing control of the converter modules is not related to that of the others in any way, thereby truly realizing the modular design of combined system, and being high in system redundancy, reliability and expandability.

Description

technical field [0001] The invention relates to a distributed voltage equalization control method of a modular ISOS combined system, which belongs to the field of power conversion. Background technique [0002] With the rapid development of power electronic technology, power electronic devices are developing in the direction of high frequency, modularization and integration. Multiple standardized converter modules are combined in series and parallel to form various power electronic devices that meet different needs. A research hotspot of electronic system integration technology. [0003] The series combination structure of multi-converter modules can be divided into two categories, namely Input-Series Output-Parallel (ISOP) combination system and Input-Series Output-Series (ISOS) combination system, where ISOP The combination system is suitable for high voltage input, low voltage and high current output applications, while the ISOS combination system is suitable for applica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/00
Inventor 陈武王广江
Owner SOUTHEAST UNIV
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