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Communication-independent multi-mode power router and its seamless switching control method

A technology of seamless switching and control methods, applied in the field of power electronics, to achieve convenient communication interaction and comprehensive energy management functions, avoid current transient problems, and improve robustness

Active Publication Date: 2021-03-30
TSINGHUA UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, the power router is required to be able to integrate various key technologies such as photovoltaic grid-connection, energy storage and conversion, and AC-DC hybrid micro-grid. and practical research is still in the initial stage of concept definition, model exploration and typical demonstration

Method used

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  • Communication-independent multi-mode power router and its seamless switching control method
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  • Communication-independent multi-mode power router and its seamless switching control method

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Embodiment Construction

[0032] The embodiments will be described in detail below in conjunction with the accompanying drawings.

[0033] figure 1 It is a schematic diagram of multiple power routers including photovoltaic and energy storage connected to the grid system. Each power router includes the coordinated control of the following converters:

[0034] 1. Control method of photovoltaic DC-DC converter

[0035] The commonly used control method for photovoltaic DC-DC converters in microgrids is to work in MPPT mode under grid-connected conditions, and transmit maximum power to the grid. At this time, the voltage of photovoltaic cells is controlled, which is the input voltage of the converter; After the status or converter power is limited, in order to limit the photovoltaic output power, it is necessary to control the output voltage of the converter. For a dual-loop controlled Boost converter, when controlling the input voltage, the corresponding duty cycle-inductor current transfer function used...

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Abstract

The invention belongs to the technical field of power electronics and particularly relates to a multi-mode electric energy router independent of communication and a seamless switching control method thereof. The electric energy router comprises four control ports which are respectively connected with a photovoltaic converter, an energy storage converter, and a grid-connected inverter and a load inverter in a power electronic transformer, wherein a photovoltaic array and a storage battery pack are respectively connected with a DC bus through the photovoltaic converter and the energy storage converter, and the grid-connected inverter and the load inverter are respectively connected with the DC bus. The method comprises steps that the energy storage converter is started, and a DC bus voltageis stabilized; the photovoltaic converter adopts a forward disturbance observation mode to realize a maximum power point tracking mode, and a reverse disturbance observation mode is adopted to realizea limited power operation mode when the output voltage exceeds a threshold value; the grid-connected inverter is switched among a grid-connected mode, an island mode and a blocking mode; the load inverter stabilizes the output voltage or enters a limited power mode as required.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a communication-independent multi-mode power router and a seamless switching control method thereof. Background technique [0002] In recent years, the large-scale popularization of distributed photovoltaic, wind power generation, two-way electric vehicle energy storage and other devices is changing the traditional grid form. The user side is transformed from the traditional one that only absorbs electric energy into a cell unit with distributed supply and storage capabilities. On the one hand, the power router realizes the access function, realizes the connection of photovoltaic, energy storage and other energy systems on the user side, and distributes the power required by the load. Photovoltaic systems have fluctuating and intermittent characteristics. In order to maximize the use of solar energy, maximum power tracking is required, and the energy must be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/38H02J3/32H02J9/06
CPCH02J3/32H02J9/062Y02B10/70Y02B70/30Y02E10/56Y02E70/30Y04S20/20
Inventor 聂金铜赵争鸣袁立强段任之孙建宁冯高辉
Owner TSINGHUA UNIV
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