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Direct-current side control method for midline arm control model of four bridge arm photovoltaic inverter

A photovoltaic inverter and control model technology, applied in the direction of converting AC power input to DC power output, photovoltaic power generation, AC network circuits, etc., can solve problems such as the inability to directly apply multiple input and multiple output systems, and achieve work performance improvement, The effect of midpoint voltage stabilization

Active Publication Date: 2011-02-16
STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST +1
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Problems solved by technology

[0004] Using classical control theory to control the center line arm must adopt a sufficiently large amplitude gain and phase margin, so that the feedback system can still maintain system performance and effectively suppress interference under large disturbances; and it cannot be directly applied to multi-input multi- output system

Method used

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  • Direct-current side control method for midline arm control model of four bridge arm photovoltaic inverter
  • Direct-current side control method for midline arm control model of four bridge arm photovoltaic inverter
  • Direct-current side control method for midline arm control model of four bridge arm photovoltaic inverter

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Embodiment Construction

[0017] The specific implementation of the present invention includes: establishment of a four-leg photovoltaic inverter center line arm control model; DC side midpoint voltage balance H∞ control modeling and H∞ controller design; realization of the generalized controlled object P; closed-loop transfer function Implementation; selection of weighting function.

[0018] (1) Establish the control model of the center line arm of the four-arm photovoltaic inverter

[0019] Taking the neutral point N as the benchmark, define half of the sum of the voltages of the two capacitors relative to the neutral point as V ave , the voltage difference is the DC side voltage value, then:

[0020] V + V - = 0.5 1 ...

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Abstract

The invention discloses a direct-current side control method for a midline arm control model of a four bridge arm photovoltaic inverter. The midline arm control model comprises a photovoltaic direct-current input, a stabilized voltage capacitor, a direct-current booster circuit, two groups of inverter side storage capacitors, two equivalent bleeder resistors connected in series, a midline inductor and a midline arm. The invention discloses a direct-current side midpoint balance control method and a controller design method suitable for the midline arm control mode., wherein an average value of signals in a switching period of a midline arm switching function is used as a control variable; an H-infinity controller is designed by adopting an H-infinity control method; and the H infinite norm of the input midline current, measurement error, equivalent external disturbance, half of the sum of the output voltages of the two capacitors relative to a neutral point and midline arm midpoint voltage is minimum; and the invention provides implementation of a corresponding generalized controlled object, a controller structure and a corresponding weighting function selection method. The method can ensure that the stability of the direct-current side midpoint of the four bridge arm photovoltaic inverter still can be kept in high midline current.

Description

technical field [0001] The invention relates to a DC side control method for a control model of a line arm of a four-arm photovoltaic inverter, belonging to the technical field of photovoltaic grid-connected system control. Background technique [0002] With the consumption of non-renewable energy, harsh environmental conditions, and continuous rise in energy demand, new energy technology, as a feasible energy solution for the future development of mankind, has received widespread attention. Photovoltaic grid-connected system is an effective platform for the application of solar power generation technology. Photovoltaic grid-connected inverters suitable for low-voltage distribution networks usually need to obtain neutral wires. In the way of obtaining the neutral line, the four-leg photovoltaic inverter has a stronger zero-sequence compensation capability than the three-leg photovoltaic inverter, and is more suitable for adopting advanced control methods to balance the midp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38H02M7/5387
CPCH02M7/53871Y02E10/563H02J3/383H02J2300/24H02J3/381Y02E10/56
Inventor 范瑞祥肖红霞罗安
Owner STATE GRID JIANGXI ELECTRIC POWER CO LTD RES INST
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