Three-phase lcl type networked converter and method for multivariable feedback control

Abstract

The invention discloses a multivariable feedback control type three-phase LCL networking converter and a method. The networking converter comprises a first summator, a second summator, a third summator, a fourth summator, a first controller, a second controller, a first compensator and a second compensator. An input end of the first controller is connected to an output end of the first summator, a first input end of the third summator is connected to an output end of the first controller, a second input end of the third summator is connected to an output end of the first compensator, and an input end of the first compensator is connected with a state quantity. The third summator outputs d-axis modulating signals. An input end of the second controller is connected to an output end of the second summator, a first input end of the fourth summator is connected to an output end of the second controller, a second input end of the fourth summator is connected to an output end of the second compensator, and an input end of the second compensator is connected with the state quantity. The fourth summator outputs q-axis modulating signals. The multivariable feedback control type three-phase LCL networking converter and the method have advantages of high stability, high steady state precision, low dynamic response fluctuation and high speed.

Description

technical field [0001] The invention belongs to the field of three-phase LCL type networked converters, and more specifically relates to a multivariable feedback-controlled three-phase LCL type networked converter and a method thereof. Background technique [0002] Considering that the public power grid is generally a three-wire system, three-phase networked converters are more widely used in practice than single-phase networked converters, such as rectifiers, grid-connected inverters, active power filters, and static synchronous compensators. And unified power quality regulators and other equipment connected to the grid. In order to control the active and reactive components separately, three-phase networked converters often choose to implement control in the rotating coordinate system, and the traditional PI controller in the rotating coordinate system has the ability to track the DC command without static error. Fundamental control of three-phase grid-connected converter...

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Problems solved by technology

[0004] Aiming at the defects of the prior art, the object of the present invention is to provide a three-phase LCL type connected converter with multivariable feedback control, which aims to solve the problem of weak damping of the LCL type filter connected converter in the prior art, and the Coupling problems introduced when controlling the dq-axis rotating coordinate system

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