Power distribution network reliability evaluation method based on network equivalence method
A network equivalence method and technology of distribution network, applied in the field of electric power engineering, can solve the problems of only considering the radiating grid structure, the complex structure of the distribution network, and the complicated calculation steps of the reliability of the distribution network. Effects of Speed, Simplified Complexity
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Embodiment 1
[0064] Embodiment 1: In reliability evaluation, components can be divided into two types: repairable components and non-repairable components, and most components in the power system are repairable components. In the power distribution system, the repairable components mainly include circuit breakers, busbars, overhead lines, cable lines, disconnectors, fuses, load switches and distribution transformers. For a power distribution system component in use, there are mainly three states: normal operation, fault outage and planned maintenance. Since the reliability research of the distribution network is carried out based on whether the power failure of the user is caused, the planned Maintenance and fault power outage are merged into a fault state (see figure 1 ), as shown in the following formula:
[0065] λ=λ'+λ"
[0066]
[0067] In the formula, λ' is the outage rate of faults, γ' is the fault maintenance time; λ" is the planned maintenance rate, γ" is the planned maintena...
Embodiment 2
[0115] Embodiment 2: a distribution network reliability assessment method, comprising the following steps:
[0116] S1: upward equivalent process and parameter calculation;
[0117] S2: Downward equivalent process and parameter calculation;
[0118] S3: Parameter calculation of the equivalent power point after the load is reloaded;
[0119] S4: Equivalent failure time and equivalent failure rate after load reloading;
[0120] The parameter calculation of the equivalent power point includes the following steps:
[0121] If Z j On the load transfer path, then
[0122]
[0123]
[0124] If Z j is not on the load transfer path, then
[0125]
[0126]
[0127] Z j and Z jk Structurally unconnected, under the condition that there is a tie line and satisfies the N-1 check Z jk failure of any component in the Z j Load transfer is possible:
[0128]
[0129]
[0130] Z j The equivalent parameters of the equivalent power point of :
[0131]
[0132] ...
Embodiment 3
[0134] Embodiment 3: Taking the 10kV power distribution system of a certain city as an example, the present invention is used to evaluate its reliability. The structure of the power distribution system is as follows Figure 5 As shown, the calculation results are shown in Tables 1 to 3:
[0135] Table 1 Reliability indicators of some typical load points
[0136]
[0137] Table 2 10kV bus reliability index
[0138]
[0139] Table 3 System reliability index
[0140]
[0141] Based on the traditional simple radial distribution network power supply reliability evaluation method, the present invention fully considers circuit breakers, tie switches, branch lines, backup transformers and load reloading conditions, and proposes an improved network equivalent method Model. This model first processes the complex power distribution system in layers, and then gradually equates it to a simple radial distribution network, which simplifies the complexity of power distribution sys...
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