Layered and zonal control based voltage regulation method of active power distribution network
A technology of layered partitioning and distribution network, applied in the direction of AC network voltage adjustment, single network parallel feeding arrangement, etc., can solve the problem of increasing investment, and the voltage regulation method cannot meet the flexibility, effectiveness, applicability and economy at the same time. , reduce the economics of power grid operation and other issues, to achieve the effect of reducing the degree of mutual influence, fast and effective voltage regulation, and avoiding conflicting actions
Inactive Publication Date: 2016-06-01
RES INST OF ECONOMICS & TECH STATE GRID SHANDONG ELECTRIC POWER +2
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Problems solved by technology
Although D-STATCOM has a fast response speed, can eliminate voltage flash and improve power supply quality, but the installation of D-STATCOM requires additional investment, which reduces the economy of power grid operation
[0010] It can be seen that the current voltage regulation methods for active distribution networks cannot meet the common requirements of flexibility, effectiveness, applicability and economy at the same time.
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example 1
[0108] by figure 1 Taking the 33-node distribution network system shown as an example, under normal operation, the DG emits 1MW of active power and the power factor is 1. When the load change in a DG control domain causes the voltage of the relevant node to exceed the limit, the maximum reactive power that the DG can emit or absorb is Q=±1MVAR. The total load of the distribution network is 3.715MW+2.3MVAR, and the secondary side voltage of the substation is set to 1.0pu. When no DG is connected, the system node voltage waveform is as follows figure 2 As shown in curve 1, most of the node voltages are too low and exceed the voltage regulation range of the OLTC. Consider using the power output of the distributed power supply to regulate the voltage. The method of selecting the DG installation location is as follows: Figure 12 shown, including the following steps:
[0109] (1) Ignore the load of node i and form the node admittance matrix Y of the power grid bus ;
[0110]...
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The invention discloses a layered and zonal control based voltage regulation method of an active power distribution network. The voltage regulation method comprises the following steps of firstly, determining an installation position of DG according to a position index L<DG> so that the maximum voltage support effect is developed by the DG; secondly, dividing voltage regulation regions of each voltage regulation device by a concept of voltage sensitivity; and finally, regulating voltage by a method of coordinative sequence control. Compared with blind determination of a DG access position, the access positions and number of the DGs are determined according to the position index, and the purpose of providing maximum voltage support by the DG can be achieved; with the adoption of a layered voltage regulation strategy, the action sequence of each voltage regulation device is determined according to VRZ where a voltage out-of-limit node is located, the action frequency of the device is reduced, and mutual influence degree among control regions is reduced, and the purpose of rapid and effective voltage regulation can be achieved; and meanwhile, the conflict action among voltage regulation devices is prevented.
Description
technical field [0001] The invention relates to a voltage regulation method for an active distribution network based on hierarchical partition control. Background technique [0002] With the sharp increase in power demand and the gradual realization of the superiority of distributed power, the installation of distributed power in the distribution network has become an inevitable trend. Distributed power generation is a new power supply mode that is completely different from the traditional centralized power supply mode. It is arranged in a decentralized way in the distribution network far away from the load of the power plant to improve the reliability of power supply for local users. Its power is generally several kilowatts to between 50 MW. Compared with the traditional centralized power supply mode, distributed power generation has the characteristics of energy saving, environmental protection, safety and reliability, less investment, and small footprint, so it has attra...
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CPCH02J3/12H02J3/46
Inventor 吴健冯亮吴奎华孟庭如邹贵彬郑志杰杨波梁荣孙伟王飞杨慎全孙雯李凯李昭
Owner RES INST OF ECONOMICS & TECH STATE GRID SHANDONG ELECTRIC POWER