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Predictive control method and system for stabilizing power fluctuation of hybrid energy storage circuit

A predictive control, hybrid energy storage technology, applied in electric vehicles, circuit devices, battery circuit devices, etc., can solve problems such as poor circuit dynamic response characteristics

Active Publication Date: 2020-03-24
HUAZHONG UNIV OF SCI & TECH
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  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the defects of the prior art, the purpose of the present invention is to provide a predictive control method and system for hybrid energy storage circuits to stabilize power fluctuations, aiming to solve the problem of poor dynamic response characteristics of circuits in existing PI control methods

Method used

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  • Predictive control method and system for stabilizing power fluctuation of hybrid energy storage circuit
  • Predictive control method and system for stabilizing power fluctuation of hybrid energy storage circuit
  • Predictive control method and system for stabilizing power fluctuation of hybrid energy storage circuit

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Embodiment

[0137] Such as figure 1 As shown, determine the topology of the hybrid energy storage circuit to be controlled predictively. The energy storage system includes four sub-parts: photovoltaic power supply, DC load, supercapacitor energy storage and battery energy storage; figure 2 As shown, the supercapacitor is connected to the DC bus through a three-level bidirectional DC / DC converter, and the battery is used as an energy compensation device for the supercapacitor through a two-level bidirectional DC / DC converter.

[0138] It should be pointed out that in practical applications, the voltage values ​​of the two voltage-dividing capacitors of the three-level converter will be very different, resulting in a neutral point current i n , it is necessary to distribute the on-off of the switching tube to balance the neutral point voltage (NPV). details as follows:

[0139] When V dc / 2uc dc , the capacitance C 1 、C 2 Both connected to the circuit work, the first inductance L 1 T...

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Abstract

The invention discloses a predictive control method and system for stabilizing power fluctuation of a hybrid energy storage circuit. The invention belongs to the technical field of electrical engineering, the method comprises the steps of predicting equations according to super-capacitor and direct-current bus terminal voltages; obtaining a reference value of the inductive current at the next moment as a tracking target of inner-layer control; a dynamic characteristic equation of inductive current is considered; obtaining a prediction equation of the inductive current; the duty ratio of the two-stage converter is continuously adjusted respectively; and iteratively calculating a two-stage inductive current prediction value, finding out a value closest to the reference value of the inductivecurrent transmitted by the outer layer control at the next moment, and obtaining a PWM signal for controlling the two-stage converter. The DC microgrid controlled by the prediction control method provided by the invention has good dynamic response performance.

Description

technical field [0001] The invention belongs to the technical field of electrical engineering, and more specifically relates to a predictive control method and system for a hybrid energy storage circuit to stabilize power fluctuations. Background technique [0002] Compared with the traditional AC microgrid, the DC microgrid does not require complex AC / DC converters, and there is no series of negative effects caused by reactive power, which reduces the power loss caused by the rectification link and improves the efficiency of renewable energy. Consumption capacity, grid transmission capacity, power quality, and overall efficiency, the research progress of DC microgrids has received extensive attention. [0003] Distributed new energy is an important part of the microgrid system. However, there are high and low frequency fluctuations in the power generated by new energy. The hybrid energy storage system (HESS) acts as an energy buffer in the DC microgrid. By using different e...

Claims

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Application Information

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IPC IPC(8): H02J1/14H02J7/34H02J3/32H02J3/38
CPCH02J1/14H02J3/32H02J7/345
Inventor 陈霞陈思源杨丘帆闫林芳文劲宇
Owner HUAZHONG UNIV OF SCI & TECH
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