Location selection and capacity determination method for distribution network energy storage based on power electronic transformer
A technology of power electronics and transformers, which is applied in the field of energy storage site selection and capacity determination in distribution networks based on power electronic transformers, can solve problems such as insufficient battery charging, photovoltaic systems cannot fully realize economic benefits, and can not be economical, and achieve reduction The effect of network loss
Active Publication Date: 2021-10-01
SHANGHAI JIAOTONG UNIV
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[0003] When the battery is used as the energy storage system, the capacity configuration of the battery has a great impact on photovoltaic power generation. If the capacity is too large, it will not only increase the investment, but also the battery will be in a state of insufficient charge for a long time, which will affect the use effect and life of the energy storage. Better realize its economy; when the capacity selection is too small, the photovoltaic system cannot fully realize the economic benefits, and the power supply reliability of the power grid is reduced
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[0041] Such as figure 1As shown, this embodiment is a power distribution network based on a power electronic transformer. The power electronic transformer has a three-port structure, one of which is connected to a 10kV AC main network, and the other two ports are respectively connected to a 380V AC bus and a ±375V DC bus. Photovoltaic and energy storage devices are AC connected, because the location of energy storage will affect the power flow to the distribution network, and then affect the line loss, so the objective function of the outer layer location optimization in this embodiment is line loss and power electronic transformer port loss , where the loss calculation needs to clarify the real-time charging and discharging status of the energy storage device and the real-time operating status of the entire distribution network, and the charging and discharging of the energy storage and the operation of the distribution network are related to the energy storage capacity, so th...
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A method for location selection and capacity determination of energy storage in distribution networks based on power electronic transformers. Firstly, a two-layer optimal configuration model of energy storage in distribution networks based on power electronic transformers is established, and the energy storage device’s capacity is obtained through internal capacity optimization. The optimal capacity, the energy storage output under the optimal capacity and the power of the tie line, and then the objective function related to the network loss in the outer layer position optimization is obtained through the power flow calculation, and finally the optimal position of the energy storage device is obtained through the particle swarm optimization algorithm, namely The port location of the PET. The invention can significantly reduce the loss of the entire network, and at the same time improve the net profit of the power grid operation.
Description
technical field [0001] The invention relates to a technology in the field of distribution network design, in particular to a method for selecting the location and capacity of energy storage in the distribution network based on a power electronic transformer. Background technique [0002] The friendly connection between the existing microgrid and its renewable energy and the distribution network uses the power regulation means of the energy storage device and the power distribution function of the power electronic transformer. The power electronic transformer (PET) rectifies the power frequency alternating current into direct current and then reverse Transform into high-frequency alternating current, use a high-frequency transformer to realize the transformation of voltage and current, and finally convert the high-frequency alternating current into power frequency alternating current and direct current; the energy storage system relies on its fast power adjustment and the char...
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IPC IPC(8): H02J3/28
CPCH02J3/28H02J2203/20
Inventor 耿琪胡炎邰能灵徐新星李小宇庆晨孙秋
Owner SHANGHAI JIAOTONG UNIV