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A fault tolerant control method for medium voltage CS-APF based on selective current limiting

A CS-APF, fault-tolerant control technology, applied in the field of medium-voltage CS-APF fault-tolerant control based on selective current limiting, can solve the problems of long adjustment time and poor dynamic performance, and achieve low hardware cost, broad market space, and balance dynamic effect

Active Publication Date: 2018-12-18
LIAONING TECHNICAL UNIVERSITY
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Problems solved by technology

However, in this document, when the harmonic current command exceeds the rated current, the output compensation current is immediately blocked, and the command current is increased from zero to the rated current value according to the variable step priority limiting strategy. This process generally requires 2 to 3 power frequency period, and the rated current value of CS-APF is much larger than that of the traditional two-level APF, and the adjustment time is longer, so the dynamic performance of this strategy is poor

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  • A fault tolerant control method for medium voltage CS-APF based on selective current limiting
  • A fault tolerant control method for medium voltage CS-APF based on selective current limiting
  • A fault tolerant control method for medium voltage CS-APF based on selective current limiting

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[0048] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0049] The topology of the main circuit of the medium voltage CS-APF involved in this embodiment is as follows: figure 1 As shown, because APF requires high dynamic response speed and switching frequency, IGBT is selected as the switching device, and the rated voltage is 1700V. The order N of series connection of each phase needs to be determined according to the application. Taking the 10KV distribution network as an example, with a safety margin of 2 times, the appropriate voltage of each cascade unit is 800-1000V. The order N of cascade units connected in series for each phase is approximately 10 or so, the corresponding order of other medium-voltage power grids can be...

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Abstract

The invention provides fault tolerant control method for medium voltage CS-APF based on selective current limiting and relates to that technical field of cascade APF fault-tolerant control. In this method, the optimal non-fault voltage vector is selected to replace the fault voltage vector as equivalent as possible by using the characteristic of cascaded inverter with many redundant voltage vectors and often overlapping positions after current limiting of the command current in different stages. The output current of the CS-APF can accurately track the reference value in the fault state. While fully utilizing the redundant voltage vector of the cascaded inverter to realize fault-tolerant control, the invention utilizes a selective current limiting mode to solve the problem of insufficientcapacity of the inverter under the fault-tolerant operation state, and improves the performance of harmonic compensation precision of CS-APF in fault-tolerant operation state, can improve the performance of fault-tolerant capability of CS-APF to reduce hardware cost.

Description

technical field [0001] The invention relates to the technical field of cascaded APF fault-tolerant control, in particular to a medium-voltage CS-APF fault-tolerant control method based on selective current limiting. Background technique [0002] Active power filter (APF) has a high degree of controllability and rapid response, and is an ideal filtering device for controlling harmonic pollution and improving power quality. The traditional two-level APF is limited by the turn-off voltage level and small capacity of the power switching device, and it is difficult to meet the current high-voltage and high-power applications. Therefore, the multi-level cascading scheme and multiple main circuit structure are the current APF major trends in development. In particular, the multi-level cascade shunt active power filter (CS-APF) has the advantages of large capacity, low switching frequency, flexible structure, convenient replacement, and small current ripple. It can solve the proble...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/20
Inventor 李国华谢国民张美金刘佳新李昊
Owner LIAONING TECHNICAL UNIVERSITY
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