Abstract
Aiming at the problem of low redundancy in the structure of the cascaded H-bridge STATCOM. This paper studies and designs a cascaded H-bridge STATCOM device based on STM32 distributed control. The article introduces the basic topology of the device and the realization principle of the control system. The turn-on and turn-off time of the MOSFET in each H-bridge is calculated by using the law of minimum harmonics, realize the output of the fitted sine wave. A simulation model of 12H bridge cascade is built in the EMTP power system electromagnetic transient analysis simulation software. The simulation results show the correctness and reliability of the design.
Highlights
Along with the development of the industry, to the requirement of power quality enhances unceasingly, more and more widely used in power system, flexible ac transmission system (FACTS) for power transmission, reactive and static synchronous compensator (STATCOM) as the core device with fast response speed, good effect of adjusting, operating a wide range, output reactive current is not affected by system voltage of the many advantages[1]
H-bridge cascade multi-level structure, whose basic power unit is H-bridge with independent DC power supply, is a series structure formed by cascading several H-bridge units, which does not have the problem of DC capacitance and partial voltage[4]
Main features of this design is to put distribution control system chip STM32 and main control system in the unity of potential, and will trigger the potential part and the power of the power device independence, this solves the important problem of multilevel power need more potential, at the same time satisfy the STM32 power supply reliability, and communication using equipotential, eliminating the high cost of optical fiber communication
Summary
Along with the development of the industry, to the requirement of power quality enhances unceasingly, more and more widely used in power system, flexible ac transmission system (FACTS) for power transmission, reactive and static synchronous compensator (STATCOM) as the core device with fast response speed, good effect of adjusting, operating a wide range, output reactive current is not affected by system voltage of the many advantages[1]. The two-stage pipe clamp multi-level structure, the flyover capacitor clamp multi-level structure and the H-bridge cascade multi-level structure[3] Among these methods, H-bridge cascade multi-level structure, whose basic power unit is H-bridge with independent DC power supply, is a series structure formed by cascading several H-bridge units, which does not have the problem of DC capacitance and partial voltage[4]. H-bridge cascade multi-level structure, whose basic power unit is H-bridge with independent DC power supply, is a series structure formed by cascading several H-bridge units, which does not have the problem of DC capacitance and partial voltage[4] It has the advantages of easy expansion, high quality output voltage and low harmonic content[5]. Main features of this design is to put distribution control system chip STM32 and main control system in the unity of potential, and will trigger the potential part and the power of the power device independence, this solves the important problem of multilevel power need more potential, at the same time satisfy the STM32 power supply reliability, and communication using equipotential, eliminating the high cost of optical fiber communication
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