Synthetic control method for optical-storage coordination and output voltage equalization of series impedance source converters
A series impedance, comprehensive control technology, applied in the direction of converting DC power input to DC power output, control/regulation system, output power conversion device, etc., can solve the problem of unfavorable system expansion, poor system stability, impedance source converter output voltage Unbalance and other problems to achieve the effect of reducing mutual interference
Inactive Publication Date: 2020-05-26
HARBIN INST OF TECH
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Problems solved by technology
[0005] The purpose of the present invention is to solve the problem that the voltage equalization control strategy of the medium-voltage DC power supply system is not conducive to system expansion, and the output voltage of the impedance source converter connected in series is unbalanced, which leads to poor stability of the entire system. Synthetic control method for optical-storage coordination and output voltage equalization of series impedance source converters
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Embodiment 1
[0037] combine figure 1 and figure 2 Describe this embodiment 1, the optical-storage coordination and output voltage equalization comprehensive control method of the series impedance source converter described in this embodiment 1, the method is used to control the three-port DC conversion composed of n impedance source converters connected in series device, characterized in that,
[0038] In this comprehensive control method, the average input voltages of n impedance source converters are respectively controlled by n voltage equalization and voltage stabilization control modules, and then the voltage stabilization control is performed, so that each voltage equalization and voltage stabilization control module generates The corresponding phase shift angle;
[0039] And the photovoltaic output voltage V of the three-port DC converter through the MPPT control module pv and photovoltaic output current i L1 The formed photovoltaic maximum power is tracked and controlled, and ...
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The invention relates to an optical storage coordination and output voltage sharing integrated control method for series impedance source converter, specifically to an optical storage coordination anddistributed output voltage sharing integrated control method suitable for medium voltage DC power supply system. It solves the problem that the voltage sharing control strategy of the medium voltageDC power supply system is not conducive to the system expansion and the output voltage of the series impedance source converter is unbalanced, which leads to the poor stability of the whole system. The integrated control method of the invention adopts a phase-shifting through modulation mode, wherein, the control variable through angle is used for adjusting the photovoltaic module to realize maximum power tracking, and the output voltage stabilization is realized by controlling the phase-shifting angle between the primary side bridge arms of the transformer. In addition, the average voltage onthe input side is added as a new voltage reference value on the basis of the voltage reference value output by the system. When the output voltage of the series impedance source converter is unbalanced, the voltage sharing is realized by changing the corresponding voltage reference value. The invention is mainly applicable to a medium voltage DC power supply system.
Description
technical field [0001] The invention relates to a comprehensive control method for optical-storage coordination and distributed output voltage equalization of a series impedance source three-port converter suitable for a medium-voltage direct current power supply system. Background technique [0002] In a DC power supply system containing renewable energy power generation, the three-port converter can be used as an interface converter connecting photovoltaic modules, energy storage devices and loads. It can realize power transmission and voltage level matching between power ports, and has a relatively High power density has thus received widespread attention. The impedance source three-port converter combines the quasi-Z source impedance network with the full-bridge converter, in which two ports are connected through the impedance network in a non-isolated manner, and these two ports are isolated from the other port by a high-frequency transformer, using a high-frequency tra...
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IPC IPC(8): H02M3/335H02J3/38
CPCH02J3/385H02M3/33569Y02E10/56
Inventor王盼宝王凯峰张临志孙红梅王卫徐殿国
OwnerHARBIN INST OF TECH