10kV power distribution station spare power automatic switching action state identification method based on power flow anomaly analysis
A technology of action state and identification method, which is applied to electrical components, circuit devices, emergency power supply arrangements, etc., can solve problems such as misoperation, failure to know the action state of standby automatic switching in time, and reduced system operation safety and stability.
Pending Publication Date: 2020-10-23
SHANGHAI MUNICIPAL ELECTRIC POWER CO
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[0004] However, due to the fact that the digital sampling module of the device itself may have problems such as distortion and jumping, under certain operating conditions, there will be "unexpected" actions, that is, refusal to operate when a fault occurs and malfunction during normal operation.
In particular, the current distribution substation has not been connected to the main dispatching station system, so it is impossible to know the status of the standby automatic switching operation in time. After the standby automatic switching operation occurs, it will be in an abnormal operation mode for a long time; The "closed loop" operation of the system reduces the safety and stability of the system operation, and cannot guarantee the timeliness of fault elimination
[0005] With the deepening of distribution network automation research, the access of distribution station telemetry, remote signaling, and remote control functions will enable the complete reporting of protection action information in the station, and real-time detection of unexpected or unexpected actions of the distribution network system. However, under the realistic technical conditions that the current distribution network automation has not yet achieved full access, how to accurately identify the action logic of standby automatic switching, and accurately distinguish between the two action states of action and misoperation is the key to improving the safe and stable operation of the power grid and ensuring the reliability of system power supply. important move
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[0065] Taking LX182 station of a 10kV distribution station as an example, the topology diagram is as follows figure 2 , the unbalanced rate of the busbar in the CY station of the superior substation and the loss rate of the two 10 kV feeders Cao 7CY1222 A / Cao 57YLQ768 A, Cao 17YLQ768 B / Cao 67SQ300 Lane 3 B have abnormal changes at the same time, and the data after the changes are as follows image 3 , Figure 4 As shown, judge the standby automatic switching action state of the substation.
[0066] (1) Divide the wiring mode by taking the 10kV substation as a whole as the load object, including the "double circuit" wiring mode and the "dual power supply" wiring mode: according to figure 2 , the upper level of LX182 station comes from different outgoing lines of the same substation CY station and each serves as a backup for each other, so it is a double-circuit wiring mode. In double-loop wiring mode, steps (4) (5) can be ignored.
[0067] (2) Establish the relationship be...
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The invention discloses a 10kV power distribution station spare power automatic switching action state identification method based on power flow anomaly analysis, and belongs to the field of power grid operation management. The method comprises the steps of: performing wiring mode division by taking the whole power distribution station as a load object; establishing a change relational expressionbetween different action states of spare power automatic switching of the power distribution station and the bus unbalance rate of an upper-level transformer substation in a corresponding wiring mode;establishing a change relational expression between different action states of spare power automatic switching of the power distribution station and a feeder line loss rate in a corresponding wiringmode; and establishing a corresponding rule of different action states of the spare power automatic switching of the power distribution station and the power flow change formula, and distinguishing the abnormal action state of the spare power automatic switching of the power distribution station through rule matching. The backup power automatic switching action state in the power distribution station can be quickly and accurately identified, the real-time monitoring rate of a field protection device is improved, the consistency of a plate and a field in operation-distribution-regulation connection of the power distribution network is ensured, timely and accurate defect elimination of the backup power automatic switching abnormal action state of the power distribution station is facilitated, and the power supply reliability and the operation safety of the power distribution network are improved. The method can be widely applied to the distribution network operation management field.
Description
technical field [0001] The invention relates to the field of power grid operation management, in particular to a method for identifying the operating state of a protection device for a 10-kV substation system. Background technique [0002] Due to the higher and higher requirements for power supply reliability, there are already multiple power supply lines with two or more circuits, and the automatic input device for backup incoming lines is usually installed to improve reliability. [0003] The standby automatic input device is referred to as "preparation automatic input". The application of "preparation and automatic switching" reduces the power outage time and ensures the continuity and reliability of the system power supply. [0004] However, due to the fact that the digital sampling module of the device itself may have problems such as distortion and jumping, under certain operating conditions, there will be "unexpected" actions, that is, refusal to operate when a fault...
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IPC IPC(8): H02J9/06H02J3/06
CPCH02J9/06H02J3/06H02J2203/10
Inventor史媛韩浩江杨剑夏澍郑天奇顾劲岳张帆陈佳瑜徐迅潘怡琪王思麒
OwnerSHANGHAI MUNICIPAL ELECTRIC POWER CO