MMC module voltage measuring and fault locating method based on state monitoring

A technology of voltage measurement and voltage, which is applied in the direction of only measuring voltage, measuring current/voltage, measuring electricity, etc., and can solve problems such as increased system influence, hardware complexity, and high cost

Active Publication Date: 2016-06-15
SOUTHEAST UNIV
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing module voltage measurement method is to directly measure the capacitor voltage of each module. On the one hand, each module must have a corresponding voltage sensor or voltage measurement circuit. The hardware complexity and cost are very large. On the other hand, The voltage of the capacitor in the module is often measured, and the fault of the

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  • MMC module voltage measuring and fault locating method based on state monitoring
  • MMC module voltage measuring and fault locating method based on state monitoring
  • MMC module voltage measuring and fault locating method based on state monitoring

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Embodiment

[0046] The method provided by the invention is applicable to single-capacitor or double-capacitor modules whose output voltages of all modules in the MMC are greater than or equal to 0.

[0047] Such as figure 2 The dual-capacitor module shown in (b) can be regarded as a simplified or equivalent topology of various dual-capacitor modules when the module is working normally, and it is the same as figure 2 The series topology of two half-bridge single-capacitor modules shown in (a) works on the same principle, so the figure 2 The dual-capacitor module shown in (b) is taken as an example.

[0048] The proposed method of voltage measurement and fault location of MMC module based on condition monitoring selects the voltage collection point in such as figure 2 The output port of the dual capacitor module shown in (b), the algorithm is implemented in this MMC system.

[0049] Such as image 3 As shown, the MMC module voltage measurement method based on state monitoring includ...

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Abstract

The invention discloses an MMC module voltage measuring and fault locating method based on state monitoring. Output ports of two adjacent single-capacitor modules in serial connection or a double-capacitor module serve as voltage collecting points, one voltage sensor or measuring circuit can measure the voltages of two modules, the amount of sensors or circuits is greatly reduced, and hardware cost and complexity are reduced. The measuring method can be used for voltage correction, errors caused by difference in parameters as the capacitance are avoided, whether a module has faults can be determined according to the obtained voltage and module state, and the system locates the module according to a fault signal emitted by the fault module. The module voltage measuring and fault locating method is realized in a module controller, the computing load of a main controller is not increased, and the hardware requirement is lowered. The module voltage measuring and fault locating method is suitable for high-voltage large-power occasions in which multiple MMC modules are included, such as the fields including energy Internet and high-tension DC power transmission.

Description

technical field [0001] The invention belongs to the technical field of power electronics application, and particularly designs a state monitoring-based MMC module voltage measurement and fault location method. Background technique [0002] With the rapid development of the economy and the gradual expansion of the scale of social production, the demand for various forms of power continues to grow, and the requirements for power electronic equipment are also getting higher and higher, and power electronics technology is developing rapidly. With the advantages of high output voltage, low harmonic content, small voltage change rate, small voltage stress of power switching devices, and low switching frequency, it is gradually becoming a research hotspot in the field of high-voltage and high-power power applications. With the continuous improvement of the withstand voltage level and capacity of fully-controlled power electronic devices, it is possible to apply a variety of voltage...

Claims

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Application Information

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IPC IPC(8): G01R19/00G01R31/02
CPCG01R19/0084G01R31/50
Inventor 李东野赵剑锋季振东苏嘉彬陈璐瑶
Owner SOUTHEAST UNIV
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