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Current source inverter mixed H2/ H-infinity optimal guaranteed cost control method

A technology of current source type and control method, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve inductance parameter uncertainty and voltage disturbance, difficult power grid, and difficult control parameters adjustment and other issues

Active Publication Date: 2017-01-04
SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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Problems solved by technology

[0004] Traditional control methods based on proportional integral (PI) and proportional resonance (PR) have disadvantages such as slow response time, difficult adjustment of control parameters, and difficulty in dealing with grid inductance parameter uncertainty and voltage disturbances.

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  • Current source inverter mixed H2/ H-infinity optimal guaranteed cost control method
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  • Current source inverter mixed H2/ H-infinity optimal guaranteed cost control method

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Embodiment Construction

[0061] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0062] The present invention performs hybrid H for the current source inverter 2 / H ∞ Optimal guaranteed cost control. The current source inverter needs to track the current reference signal given by the upper controller in real time. This design uses full state feedback to implement H 2 / H ∞ Optimal guaranteed cost control. In the process of modeling the controlled object, the uncertainty of grid side inductance and the voltage fluctuation of AC side and DC side are described to increase the accuracy of the model. And use the convex optimization method to solve the H corresponding to the system 2 / H ∞ Optimal Guaranteed Cost Controller. In order to improve the H 2 / H ∞ The performance of the optimal guaranteed cost controller, using the particle swarm optimization (PSO) algorithm, for the hybrid H 2 / H ∞ The cost function matrix of the optimal gua...

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Abstract

The invention relates to a current source inverter mixed H2 / H-infinity optimal guaranteed cost control method. The method comprises the following steps: establishing a current source inverter state equation model and carrying out discretization thereon; carrying out extension on the discretized current source inverter state equation model to obtain an error augmented state equation model; obtaining a full state feedback control rate through the mixed H2 / H-infinity optimal guaranteed cost control method; and substituting the state feedback control rate into an inverter servo control closed-loop system to realize mixed H2 / H-infinity optimal guaranteed cost control. The method has better dynamic and static performance compared with a conventional proportional integral (PI) or proportional resonant(PR) control scheme, and has robustness in grid inductance fluctuation.

Description

technical field [0001] The invention relates to a current source inverter hybrid H 2 / H ∞ The invention provides an optimal guaranteed cost control method, which belongs to the technical field of smart grid. Background technique [0002] In the context of the current smart grid, distributed generators and energy storage systems driven by a variety of renewable energy sources (such as photovoltaics, fuel cells, and wind energy) are emerging as new technologies. The three-phase pulse width modulation (PWM) current source inverter plays an important role in connecting the above-mentioned distributed generation equipment with the large power grid. [0003] For current source inverters, a well-designed controller is required to maintain the desired state (a typical servo tracking problem) to ensure the stability and reliability of the AC and DC systems. But the AC side and DC side of the system have a certain degree of uncertainty and volatility. For example, the inductance p...

Claims

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Application Information

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IPC IPC(8): H02M7/5387
Inventor 李忠文臧传治曾鹏于海斌李鹤鹏徐石明赵有健
Owner SHENYANG INST OF AUTOMATION - CHINESE ACAD OF SCI
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