Fault-tolerant control method of chained mode grid-connected inverter based on dual-zero-sequence-voltage injection
A zero-sequence voltage, fault-tolerant control technology, applied in the field of fault-tolerant control of chain-link converters, can solve the problems of unsuitable grid-connected inverter fault-tolerant control, unfavorable DC side voltage balance, etc. Good effect without static difference control
Inactive Publication Date: 2015-06-03
SOUTHEAST UNIV
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Problems solved by technology
The most researched center point offset method can be used in the fault-tolerant control of high-voltage inverters. When the number of remaining units in each phase is not equal, the output of asymmetrical phase voltages will still maintain the consistency of line voltages. However, this method is based on the output of each unit. The voltage consistency is considered, and the power flow between the phases is not considered, which is not conducive to the balance of the DC side voltage, and is not suitable for the fault-tolerant control of the grid-connected inverter
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[0028] The invention is mainly used for the fault-tolerant control of chained H-bridge grid-connected inverters, figure 1 It is a star-connected chain-type grid-connected inverter structure diagram, in which each single phase is composed of N H-bridge units connected in series, and the three phases are connected in star form. figure 2 is the topological structure diagram of unit modules, each unit is composed of bypass mechanism (Part I), H-bridge module (Part II), and isolated DC / DC conversion module (Part III).
[0029] The present invention provides a method for fault-tolerant control of chained grid-connected inverters based on double zero-sequence voltage injection and DC side optimization. The method includes the following steps:
[0030] Step 1: Optimal control on the DC side
[0031] Step 1.1: Use the output voltage of each phase to modulate the wave Calculate the overall DC side voltage command value after optimized control
[0032] Step 1.2: Calculate the mean...
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The invention discloses a fault-tolerant control method of a chained mode grid-connected inverter based on dual-zero-sequence-voltage injection. The fault-tolerant control method can comprise the following steps of (1) direct current side optimization and control: optimizing and calculating a direct current side command value on the basis of traditional positive sequence current decoupling control; (2) balance control of inter-phase direct current side voltage: calculating a zero sequence voltage injection command value for balancing the inter-phase direct current side by virtue of a formula; (3) fault-tolerant control: calculating a zero sequence voltage injection command value for the fault-tolerant control by virtue of a formula; (4) balance control and the pulse generation on the inter-phase direct current side. According to the method, the balancing and fault-tolerant control of the direct current side voltage are comprehensively considered, the output current cannot be suddenly changed when a fault unit is processed, and the inter-phase power regulation and the voltage balancing of the direct current side can be rapidly realized; and meanwhile, by optimizing a direct current side voltage command value, the fault-tolerant capacity of the chained mode grid-connected inverter is enhanced.
Description
technical field [0001] The invention belongs to the technical field of application of high-voltage and high-power power electronic technology in power systems, and relates to a fault-tolerant control method of a chain-type converter. Background technique [0002] The H-bridge chain structure has become a research hotspot in the fields of grid-connected inverters, energy storage, and power electronic transformers. It is of great significance for large-scale grid-connected renewable energy, large-scale energy storage, and enhanced power system stability. . This type of grid-connected inverter can be connected to the high-voltage power grid without a transformer. It is easy to realize modularization in structure, and has low switching loss and harmonic output. increase, the failure rate will also increase. [0003] There are some processing methods about the fault-tolerant control of the H-bridge chain structure. Some literature proposes to use the symmetric bypass method in...
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IPC IPC(8): H02M7/48H02J3/38
Inventor 季振东赵剑锋朱泽安刘巍孙毅超姚晓君
Owner SOUTHEAST UNIV