用于分布式发电接入的交直流叠加配电网结构分析

发布时间：2018-04-26 03:12

本文选题：交直流配电网 + 分布式发电　；参考：《高电压技术》2017年01期

【摘要】：针对分布式发电(DG)并网问题,提出了一种包含分布式发电、Z型变压器、变换器、超级电容、交流负荷和直流负荷的交直流叠加配电网拓扑。分布式发电以直流形式通过直流电压变换器和Z型变压器作为接口接入网络,使得线路同时传输直流和交流功率。为了验证交直流叠加情况下Z型变压器不会出现饱和现象,利用Ansoft软件对Z型变压器进行了磁场分析,得到Z型变压器的局部最大磁感应强度为1.73 T,硅钢片的饱和点为1.7 T,Z型变压器未出现过饱和现象。考虑到分布式发电具有输出电压较低、非连续和不稳定的特点,引入电压反馈环节控制直流电压变换器,保证线路上直流电压值恒定为1.64 k V。为了平衡分布式发电出力和直流负荷需求,引入超级电容和交直流双向变换器组成的储能系统用于调节能量平衡、作为直流功率和交流功率的桥梁,当系统发生故障时保证对负荷持续可靠供电。最后采用Matlab/Simulink仿真验证了该交直流叠加配电网系统的可行性。
[Abstract]:In order to solve the grid-connected problem of distributed generation, an AC / DC superposition topology is proposed, which includes distributed generation Z-type transformers, converters, super capacitors, AC loads and DC loads. The distributed generation is connected to the network through DC voltage converters and Z-type transformers in the form of DC, which makes the lines transmit both DC and AC power at the same time. In order to verify that the Z-type transformer will not be saturated under the condition of AC / DC superposition, the magnetic field of Z-type transformer is analyzed by using Ansoft software. The local maximum magnetic induction intensity of Z type transformer is 1.73 T, and the saturation point of silicon steel sheet is 1.7 Tu Z transformer without supersaturation. Considering that the distributed generation has the characteristics of low output voltage discontinuous and unstable voltage feedback is introduced to control the DC voltage converter to ensure that the DC voltage on the line is constant to 1.64 kV. In order to balance the demand of distributed generation output and DC load, the energy storage system composed of super capacitor and AC / DC bi-directional converter is introduced to adjust the energy balance, which acts as a bridge between DC power and AC power. Ensure continuous and reliable power supply to the load when the system fails. Finally, the feasibility of the AC / DC superposition distribution network system is verified by Matlab/Simulink simulation.
【作者单位】：山东大学电气工程学院;山东省特高压输变电技术与装备重点实验室;
【基金】：国家自然科学基金(51207084)~~
【分类号】：TM711

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