一种工程实用的电力系统等值方法
发布时间：2019-04-17 09:22
【摘要】：硬件在环试验中,为了兼顾仿真规模和交直流相互影响,需要对交流系统进行等值。基于等值前后系统短路容量一致原理,提出一种新型交流大电网等值方法。根据等值节点的短路电流构建等值发电机的额定容量及并网阻抗参数;根据短路电流大小与系统动态特性强弱关系,提出一种基于短路电流贡献率的新判据;采用该判据选择等效发电机的主导控制器类型,并计算控制器的参数;对静态Ward等值进行修正,消除负电阻及发电机有功输出为负的情况。通过算例对比等值前后系统电压、功率流动、短路容量以及故障后动态响应特性,验证了所提方法的有效性。
[Abstract]:In the hardware-in-loop test, AC system should be equivalent in order to take into account the influence of simulation scale and AC / DC interaction. Based on the principle that the short circuit capacity of the system is consistent before and after equivalence, a new equivalent method of AC large power network is proposed. According to the short-circuit current of the equivalent node, the rated capacity and the grid-connected impedance parameters of the equivalent generator are constructed, and a new criterion based on the contribution rate of the short-circuit current is proposed according to the relationship between the magnitude of the short-circuit current and the dynamic characteristics of the system. This criterion is used to select the dominant controller type of the equivalent generator and calculate the parameters of the controller, and modify the static Ward equivalent to eliminate the negative resistance and the negative output of the generator active power. The effectiveness of the proposed method is verified by comparing the voltage, power flow, short circuit capacity and dynamic response characteristics of the system before and after the equivalent.
【作者单位】： 全球能源互联网研究院;先进输电技术国家重点实验室;直流电网技术与仿真北京市重点实验室;国网冀北电力有限公司;东北电力大学电气工程学院;
【基金】：国家电网公司科学技术项目(SGRIZLKJ(2016)486)~~
【分类号】：TM743
本文编号：2459304
[Abstract]:In the hardware-in-loop test, AC system should be equivalent in order to take into account the influence of simulation scale and AC / DC interaction. Based on the principle that the short circuit capacity of the system is consistent before and after equivalence, a new equivalent method of AC large power network is proposed. According to the short-circuit current of the equivalent node, the rated capacity and the grid-connected impedance parameters of the equivalent generator are constructed, and a new criterion based on the contribution rate of the short-circuit current is proposed according to the relationship between the magnitude of the short-circuit current and the dynamic characteristics of the system. This criterion is used to select the dominant controller type of the equivalent generator and calculate the parameters of the controller, and modify the static Ward equivalent to eliminate the negative resistance and the negative output of the generator active power. The effectiveness of the proposed method is verified by comparing the voltage, power flow, short circuit capacity and dynamic response characteristics of the system before and after the equivalent.
【作者单位】： 全球能源互联网研究院;先进输电技术国家重点实验室;直流电网技术与仿真北京市重点实验室;国网冀北电力有限公司;东北电力大学电气工程学院;
【基金】：国家电网公司科学技术项目(SGRIZLKJ(2016)486)~~
【分类号】：TM743
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