Transmission network risk assessment method considering substation influence

Abstract

Disclosed is a transmission network risk assessment method considering substation influence. The method includes the steps of first collecting reliability parameter data of a local power grid and eachsubstation internal component as well as basic parameter data of the substation internal relay protection; then establishing a Markov state model of the power grid and the substation internal components and a relay protection implicit failure model, and determining the probability of occurrence of the components and relay protection states; then sampling a system state by using an improved non-sequential Monte Carlo simulation method; and finally, analyzing the load loss risk of the system state by using a load shedding optimization model based on the DC flow, calculating a risk index of thetransmission network and assessing the risk of the transmission network according to the risk index. The method in the invention can reflect the influence of the substation on the risk assessment of the transmission network to the greatest extent, further improves the accuracy and real-time performance of risk assessment under the premise of meeting the calculation precision, and can provide a reliable basis for power grid operators to understand the real-time risk of the power grid.

Description

technical field

[0001] The invention relates to a method capable of accurately evaluating the operation risk of a power grid, and belongs to the technical field of power transmission and distribution. Background technique

[0002] In the power system, as a key link in the power grid, the substation undertakes the power supply task from the transmission network to the user, and its main wiring directly affects the safety and stability of the power grid and the reliability of power supply. Therefore, it is of great practical significance to study the risk assessment method of transmission network considering the impact of substations.

[0003] In the actual power grid, due to the mutual influence between the substation and the grid, the reliability of the substation with the same wiring form may vary with the role and position of the substation in the system. Therefore, the impact of substations on the power grid should be considered when evaluating system risk from the persp...

Examples

Embodiment

[0170] Taking the IEEE-RTS79 test system as a calculation example, the influence factors of different substations on the risk assessment results of the transmission network are analyzed. The basic overview of the IEEE-RTS79 system is as follows: The total installed capacity of the IEEE-RTS79 test system is 3405MW, and the annual maximum load is 2850MW. There are 17 load nodes; the 220kV substation composed of bus nodes 9, 10, 11, and 12 includes 4 incoming lines, 6 outgoing lines, and 4 transformers.

[0171] The evaluation process is as follows:

[0172] Assume there is a 5% deviation in substation component parameters.

[0173] Table 1 Reliability parameters of substation internal components

[0174]

[0175] In order to analyze the impact of different main wiring forms of substations on the power grid, the 3 / 2 circuit breaker wiring (Scheme 1), the double-bus wiring (Scheme 2), the single-bus section wiring (Scheme 3) and the double-bus bypass wiring ( Scheme 4) Monte...

technical field

[0001] The invention relates to a method capable of accurately evaluating the operation risk of a power grid, and belongs to the technical field of power transmission and distribution. Background technique

[0002] In the power system, as a key link in the power grid, the substation undertakes the power supply task from the transmission network to the user, and its main wiring directly affects the safety and stability of the power grid and the reliability of power supply. Therefore, it is of great practical significance to study the risk assessment method of transmission network considering the impact of substations.

[0003] In the actual power grid, due to the mutual influence between the substation and the grid, the reliability of the substation with the same wiring form may vary with the role and position of the substation in the system. Therefore, the impact of substations on the power grid should be considered when evaluating system risk from the persp...

Examples

Embodiment

[0170] Taking the IEEE-RTS79 test system as a calculation example, the influence factors of different substations on the risk assessment results of the transmission network are analyzed. The basic overview of the IEEE-RTS79 system is as follows: The total installed capacity of the IEEE-RTS79 test system is 3405MW, and the annual maximum load is 2850MW. There are 17 load nodes; the 220kV substation composed of bus nodes 9, 10, 11, and 12 includes 4 incoming lines, 6 outgoing lines, and 4 transformers.

[0171] The evaluation process is as follows:

[0172] Assume there is a 5% deviation in substation component parameters.

[0173] Table 1 Reliability parameters of substation internal components

[0174]

[0175] In order to analyze the impact of different main wiring forms of substations on the power grid, the 3 / 2 circuit breaker wiring (Scheme 1), the double-bus wiring (Scheme 2), the single-bus section wiring (Scheme 3) and the double-bus bypass wiring ( Scheme 4) Monte...

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