CAJ | 학술논문

为准确刻画电压暂降对敏感设备的严重程度,从设备响应的物理属性出发提出了满足设备响应状态不可加性时评价暂降严重程度的可信性测度,弥补经典概率测度和模糊测度需要大量样本、具有非对偶性等问题.利用模糊统计和多项式拟合法构造设备响应状态不确定区域内各暂降特征对应的设备耐受能力隶属函数,基于不确定性理论得到联合可信性分布函数,以此建立设备电压暂降严重程度评估模型.以实测样本为依据,对个人计算机(personal computers,PC)进行仿真,并与经典概率测度和可能性测度评估结果进行比较,证明了可信性测度的正确性和可信性,评估结果更符合实际.
위준학각화전압잠강대민감설비적엄중정도,종설비향응적물리속성출발제출료만족설비향응상태불가가성시평개잠강엄중정도적가신성측도,미보경전개솔측도화모호측도수요대량양본、구유비대우성등문제.이용모호통계화다항식의합법구조설비향응상태불학정구역내각잠강특정대응적설비내수능력대속함수,기우불학정성이론득도연합가신성분포함수,이차건립설비전압잠강엄중정도평고모형.이실측양본위의거,대개인계산궤(personal computers,PC)진행방진,병여경전개솔측도화가능성측도평고결과진행비교,증명료가신성측도적정학성화가신성,평고결과경부합실제.
In order to accurately describe the equipments’ severity caused by voltage sag, the credibility measure which meets the conditions of non-additive is proposed based on their physical properties of responses. This assessment measure can avoid the deficiencies that classical probability measure needs a large number of samples and the non-duality of fuzzy measure. The membership function of sensitive equipment voltage tolerance capability corresponding to the characteristic quantities in the status uncertain area is determined by fuzzy statistical method and polynomial fitting method. Then the joint credibility distribution function is deduced based on uncertainty theory. Hence, the assessment model of severity of equipments failure is constructed. Based on practical samples, the PCs are simulated using the proposed method. Comparing the simulation results with those of methods using classical probability measure and possibility measure, it proves that the proposed method is proper and credible and can reflect practical condition more objectively. This work is supported by National Natural Science Foundation of China (No. 50877049).