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首页> 外文期刊>American journal of applied sciences >Voltage Collapse Risk Associated to Under-Voltage Capacitive Compensation in Electric Power System Operation | Science Publications
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Voltage Collapse Risk Associated to Under-Voltage Capacitive Compensation in Electric Power System Operation | Science Publications

机译：电力系统运行中与欠压电容补偿相关的电压崩溃风险| Business Wire科学出版物

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> Problem statement: In the operation of an Electric Power System (EPS), it has been usual to provide reactive power injection to avoid an under-voltage bus condition. In some situations an adequate voltage profile will not be a guarantee against Voltage Collapses (VCs) that may cause blackouts as seen in many occurrences around the world. The repeatedly injection of reactive power can turn a bus into a characteristic too much capacitive. Under this condition and in the presence of a considerable percentage of the constant power load type, there will be a high risk of a VC. Any of the indices proposed in the literature as VC Proximity Indicators (VCPIs) may alert the operator about the risk. Approach: In order to elucidate the problem stated, simulations were performed using MatLab/SimPowerSystems. It was used a basic example system composed by an infinite-bus feeding, through a large impedance line, a bus load whose power could be increased in ramp manner. It is also included a shunt capacitive compensation at the load bus every time the voltage value reaches 0.9 pu. Therefore, the VC risk increase could be shown by means of graphic results and the indications of some VCPIs sensitivity indices (including the new proposed index). Results: The graphics obtained in this study is a contribution to illustrate the voltage collapse risk problem when dealing with adjustments of voltage profile to meet the system requirements. Also, a VCPI sensitivity indicator using apparent load power was tested. The results have shown that all VCPI responses are very similar for a given case and electric system. Conclusion/Recommendations: Any VCPI information can help in the decision stage between either more reactive power injection or load shedding. A routine can also be developed for a supervisory program in order to alert the operator about VC risks.
机译： > 问题陈述：在电力系统（EPS）的运行中，通常会提供无功功率注入以避免总线电压不足的情况。在某些情况下，适当的电压曲线不能保证不会发生电压崩溃（VCs），这可能会导致停电，这在世界各地的许多情况中都可以看到。反复注入无功功率会导致总线的电容特性太大。在这种情况下，并且在相当大比例的恒定功率负载类型存在的情况下，VC的风险很高。文献中建议的任何作为VC接近度指标（VCPI）的指标都可能使操作员警惕风险。它是一个基本示例系统，该系统由通过大阻抗线路的无限母线馈电的母线负载组成，其功率可以以斜坡方式增加。每当电压值达到0.9 pu时，负载总线上还包括一个并联电容补偿。因此，可以通过图形结果和一些VCPI敏感性指数（包括新提议的指数）的指示来显示VC风险的增加。 结果：本研究中获得的图形有助于说明在处理电压曲线以满足系统要求时的电压崩溃风险问题。此外，还测试了使用视在负载功率的VCPI灵敏度指示器。结果表明，对于给定的情况和电气系统，所有VCPI响应都非常相似。 结论/建议：任何VCPI信息均可在更多无功注入或减载之间的决策阶段提供帮助。还可以为监控程序开发例程，以警告操作员有关VC的风险。

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