The invention relates to an electric vehicle fault current evaluation method considering the influence of the state of charge of a battery, and the method comprises the steps: calculating the critical state of charge of constant current-constant voltage charging switching of an electric vehicle, and judging whether the electric vehicle is charged at constant current or constant voltage according to the state of charge of the electric vehicle at a fault moment; and in a constant-current or constant-voltage charging state, respectively calculating a critical charge state of fault current over-damping/under-damping under constant-voltage or constant-current charging of the electric vehicle, judging whether the fault current is over-damping or under-damping according to the charge state of the electric vehicle at a fault moment, and respectively calculating the fault current of the electric vehicle by adopting a corresponding expression. The method can consider the influence of the state of charge on the fault current of the electric vehicle, accurately estimates and calculates the fault current of the electric vehicle, and provides more accurate reference data for the fault current analysis of the new energy power distribution network under the access of the electric vehicle. And therefore, accurate charging fault early warning or power distribution and power supply management of the charging management system on the new energy power distribution network can be better ensured.
本发明涉及一种计及电池荷电状态影响的电动汽车故障电流评估方法,该方法计算电动汽车恒流‑恒压充电切换的临界荷电状态,根据故障时刻电动汽车的荷电状态判断电动汽车为恒流或恒压充电;在恒流或恒压充电状态下,分别计算电动汽车恒压或恒流充电下故障电流过阻尼/欠阻尼的临界荷电状态,根据故障时刻电动汽车的荷电状态判断故障电流处于过阻尼或欠阻尼,并采用对应的表达式分别计算电动汽车故障电流。本发明能够考虑荷电状态对电动汽车故障电流的影响,准确估计计算电动汽车故障电流,为电动汽车接入下的新能源配电网故障电流分析提供更准确的参考数据,进而更好的保证充电管理系统对新能源配电网进行准确的充电故障预警或配电供电管理。
Electric vehicle fault current evaluation method considering influence of battery charge state
一种计及电池荷电状态影响的电动汽车故障电流评估方法
07.03.2025
Patent
Elektronische Ressource
Chinesisch
IPC: | B60L PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES , Antrieb von elektrisch angetriebenen Fahrzeugen / G01R Messen elektrischer Größen , MEASURING ELECTRIC VARIABLES / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung |
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