Three-phase four-bridge-arm dual-closed-loop control method based on emotional intelligence and passivity theory

Abstract

The invention discloses a three-phase four-bridge-arm dual-closed-loop control method based on emotional intelligence and a passivity theory. A three-phase four-bridge-arm state equation under a d-q-0 coordinate is established; an Euler-Lagrange model is established, and a passivity-based controller (PBC) is designed according to a system passivity theory; the passivity-based controller is designed to serve as a nonlinear controller; compared with a conventional PI linear controller, the passivity-based controller is more applicable to a D-STATCOM linear system; the passivity-based controller has the advantages of high control response speed and good output current waveform and can serve as a current closed-loop controller; in addition, a simplified emotional intelligent controller is adopted; a corresponding link of orbitofrontal cortex in conventional emotional control is reduced, so that the emotional controller is simplified; meanwhile, a self-learning capability which is better than conventional PI control is still kept; the stability of a direct current side voltage can be well maintained; the anti-interference capability of the system is enhanced; and due to the dual-closed-loop control method, the three-phase four-bridge-arm D-STATCOM has good, rapid and stable compensation performance at a user side of a low-voltage three-phase four-wire system power supply system.

Description

technical field [0001] The invention belongs to the application field of power electronics technology, and relates to a control algorithm of a static synchronous compensator (D-STATCOM) of a distribution network. Background technique [0002] With the rapid expansion of power system scale and the rapid development of modern power electronics technology, static var compensation technology (STATCOM) has become one of the research hotspots in the field of power system energy saving and power quality control. [0003] As a widely used energy source, electric energy has penetrated into every aspect of industrial production, society and people's life. However, my country's power grid has the status quo of frequent power factor changes, insufficient reactive power compensation capacity, common three-phase load imbalance, and large transformer no-load loss. The energy loss caused by the above-mentioned power transmission and power quality degradation cannot be ignored. [0004] In ...

AI Technical Summary

Problems solved by technology

High-voltage and high-power STATCOM must adopt multiple or chain structures due to its high voltage level and large capacity, resulting in a more complex structure, high cost, and low safety and reliability; D-STATCOM technology is due to the access voltage Low, so that the compensation capacity is not high or the compensation current is large, and it can meet the needs of local compensation and effectively solve the power quality of end users in the distribution network

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