Active power distribution network island division method considering uncertainty of distributed power supply
A distributed power supply and island division technology, which is applied in the direction of electrical components, circuit devices, AC network circuits, etc., can solve the problems of low load recovery level of distribution network and less involvement of intelligent soft switching functions
Active Publication Date: 2018-08-07
TIANJIN UNIV
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Problems solved by technology
Scholars at home and abroad have carried out preliminary research on this, but the role of intelligent soft switches in the process of load recovery is rarely involved.
Moreover, when the distribution network operates in an isolated island, due to the strong randomness of the output of distributed power sources such as photovoltaics and wind turbines, when the above factors are not considered, the load recovery level of the distribution network is often low
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[0117] For this embodiment, first input the impedance value of the line element in the IEEE 33 node system, the active power and reactive power of the load element, and the connection relationship of the network topology. The calculation example structure is as follows figure 2 As shown, see Table 1 and Table 2 for detailed parameters; 4 groups of controllable distributed power sources are connected to nodes 13, 20, 23, and 30, with a capacity of 400kVA and a minimum power factor of 0.9; nodes 5, 8, 17, 27 and 33 are connected to 5 groups of uncontrollable distributed power sources. In this embodiment, a photovoltaic power generation system is selected, with a capacity of 300kVA and a minimum power factor of 0.9; see Table 3 for the access location and parameters of the energy storage system; The soft switch SOP access test example replaces the connection lines 35 and 36, and stipulates that the direction of power injection into the system is the positive direction. The specif...
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The invention relates to an active power distribution network island division method considering uncertainty of a distributed power supply. According to the selected active power distribution network,the active power distribution network structure and parameters are inputted; according to the active power distribution network structure and the parameters, a deterministic active power distributionnetwork island division model is established, and a compact form of the active power distribution network island division model is acquired; according to the compact form of the active power distribution network island division model, an uncertainty set of an uncontrollable distributed power source is set, and an active power distribution network island division robust model considering the uncertainty of the distributed power source is established; the active power distribution network island division robust model is solved through the column and constraint generation algorithm; the solutionresult is outputted, including a recovery load coefficient of each node, the output power and a control mode of the controllable/uncontrollable distributed power source, the charging and dischargingpower and the state of charge of an energy storage system, and the transmission power of an intelligent soft switch. The method is advantaged in that the load recovery level can be effectively improved, and power supply reliability of the active power distribution network can be further improved.
Description
technical field [0001] The invention relates to a method for dividing active distribution network islands. In particular, it involves an islanding method for active distribution network considering the uncertainty of distributed generation. Background technique [0002] Reliability is one of the important characteristics of active distribution network, especially under extreme fault conditions, the use of distributed generators (distributed generators, DG) can realize the island operation of some important loads, so as to improve the reliability of system operation. After the power distribution system fails, it is often possible to ensure the continuous power supply of important loads through the coordination and cooperation of distributed power sources and energy storage systems (ESS), so as to reduce the range of affected users and improve system reliability. The energy storage system can effectively solve the problem of efficient utilization of high-penetration distribut...
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IPC IPC(8): H02J3/38H02J3/28
CPCH02J3/28H02J3/381H02J3/388H02J2203/20
Inventor 王成山冀浩然李鹏宋关羽赵金利
Owner TIANJIN UNIV
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