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Power smoothing control method for distributed optical-storage DC power supply system

A power smoothing and power supply system technology, applied in the direction of load balancing, photovoltaic power generation, collectors, etc. in the DC network, it can solve problems such as power fluctuation, and achieve stable margins, excellent static/dynamic control performance, and strong anti-interference. effect of ability

Active Publication Date: 2018-07-31
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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Problems solved by technology

[0005] Aiming at the problem of power fluctuation caused by uncertain output of photovoltaic power generation, the present invention proposes a power smoothing control method for a distributed optical-storage DC power supply system, which is a nonlinear smooth and differentiable control method, and realizes coordinated control of optical-storage and smooth output power

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Embodiment Construction

[0022] The distributed photovoltaic storage DC power supply system is mainly composed of photovoltaic units, energy storage batteries, converters and loads, such as figure 1 shown. The converter to realize the coordinated control of photovoltaic storage is designed as a four-phase interleaved switching mode, in which: considering the output power harmonic demand and economic requirements, the photovoltaic unit is connected to the DC bus through a four-phase interleaved step-up converter, and the upper bridge arm Diodes are used, and the lower bridge arm is IGBT; the energy storage battery is connected to the DC bus through a four-phase interleaved bidirectional converter, and the upper and lower bridge arms are both IGBTs. The four-phase interleaved bidirectional converter of the energy storage battery pack performs PWM modulation on the lower bridge arm, and when the upper bridge arm is turned off, the circuit is in the Boost discharge state; when the upper bridge arm perform...

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Abstract

The invention relates to a smooth control method for a power of a distributed light storage DC power supply system. A photovoltaic unit and an energy storage battery are connected to a DC bus through respective converters in parallel; the converter of the photovoltaic unit is a four-phase staggered boost converter; the maximum power p(PVmax) output is achieved by a maximum power tracking method; the converter of the energy storage battery is a four-phase staggered two-way converter; a current inner loop-power outer loop double-loop control strategy is adopted by the converter of the energy storage battery; a nonlinear smooth differentiable control method is adopted by a current inner loop; the condition that power changes of the photovoltaic unit and a load can still be quickly tracked in the presence of a load sudden change or converter parameter perturbation is ensured; and through charge-discharge control on the energy storage battery, stabilization of the power of the system is achieved. The method has relatively high anti-interference capacity on an application object with a wide power change range and large load disturbance, and has the advantages of being simple in structure, high in dynamic response speed and high in robustness.

Description

technical field [0001] The invention relates to a power supply control technology, in particular to a nonlinear differential smoothing power smoothing control method for a distributed optical storage DC power supply system. Background technique [0002] Distributed photovoltaic power generation has problems such as large output voltage fluctuations and poor system stability. The distributed photovoltaic storage DC power supply system combined with energy storage technology has been widely used due to its high-quality and high-reliability power supply capabilities. The stable control of system output power is a practical application The bottleneck lies in the bottleneck, and the rational design of the topology and control algorithm of the converter device is a feasible solution to realize the power smooth control of the optical-storage DC power supply system. [0003] In terms of converter topology, photovoltaic converters usually use Boost circuits, and energy storage conver...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J1/14H02J7/35
CPCH02J1/14H02J7/35Y02E10/56
Inventor 王育飞薛花李海霞胡英俊
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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