Hybrid energy storage DC power supply system off-network transient state control method
A technology of hybrid energy storage system and power supply system, which is applied in the field of off-grid transient control of hybrid energy storage DC power supply system, which can solve problems such as DC bus voltage fluctuation and battery shock, and achieve the effect of protecting battery life
Active Publication Date: 2021-08-06
SICHUAN ENERGY INTERNET RES INST TSINGHUA UNIV
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Problems solved by technology
[0002] Photovoltaics emit DC power, which directly supplies power to DC loads in the form of DC. When the output of photovoltaics is insufficient and the power grid fails, all DC loads are immediately switched to be powered by energy storage. The conversion process is to add all the loads to the mixed On top of energy storage, if no control measures are taken, this transient process will cause DC bus voltage fluctuations and cause a greater impact on the battery
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[0033] When the photovoltaic output is insufficient and the power grid is out of power, all DC loads are immediately switched to be powered by energy storage. The conversion process is to add all the loads to the hybrid energy storage in an instant. If no control measures are taken, this transient process will be It causes the DC bus voltage to fluctuate and causes a large impact on the battery.
[0034] Aiming at this phenomenon, the present invention proposes a DC power supply system off-grid transient control method with "echelon power battery-superconducting" hybrid energy storage. When the photovoltaic output is insufficient and the power grid fails, all DC loads will be switched immediately In the transient state powered by energy storage, the superconducting energy storage provides a transient large current to stabilize the DC bus voltage, and the cascade power battery (the cascade power battery retired from electric vehicles, compared with the general lithium battery, i...
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The invention belongs to the technical field of power supply control, and discloses a hybrid energy storage DC power supply system off-network transient state control method. In the hybrid energy storage DC power supply system off-network transient state control method, photovoltaic power emits direct current electric energy, the direct current electric energy is directly supplied to a direct current load in a direct current mode, in order to achieve power balance during power failure of a power grid, an electric vehicle retired battery and superconducting energy storage are configured to form a hybrid energy storage system, a typical power type and energy type hybrid energy storage configuration is adopted, the superconducting energy storage compensates power of high-frequency change and step change, and power gradient battery energy storage with higher energy storage capacity deals with slowly-changed power, so that the service life of the battery is protected.
Description
technical field [0001] The invention belongs to the technical field of power supply control, and in particular relates to a hybrid energy storage direct current power supply system off-grid transient control method. Background technique [0002] Photovoltaics emit DC power, which directly supplies power to DC loads in the form of DC. When the output of photovoltaics is insufficient and the power grid fails, all DC loads are immediately switched to be powered by energy storage. The conversion process is to add all loads to the hybrid in an instant On top of energy storage, if control measures are not taken, this transient process will cause DC bus voltage fluctuations and cause a greater impact on the battery. [0003] Therefore, at this stage, it is urgent to study a hybrid energy storage DC power supply system off-grid transient control method to solve the above problems. Contents of the invention [0004] The purpose of the present invention is to provide a method for o...
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IPC IPC(8): H02J1/10H02J1/14H02J15/00
CPCH02J1/106H02J1/14H02J15/00Y02E70/30Y02E40/60
Inventor 雷一李海波
Owner SICHUAN ENERGY INTERNET RES INST TSINGHUA UNIV