Power-grid-load-storage control and load flexible switching method in lightning climate
A technology of source network load and electric climate, applied in the direction of electrical components, AC network load balancing, and AC network with the same frequency from different sources, etc., can solve the problems of high equipment cost, lack of early warning, power outage, etc., and achieve low implementation cost , Improve stability and reduce load loss
Active Publication Date: 2019-10-08
JIANGSU ELECTRIC POWER CO
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Problems solved by technology
However, since Line B still has a load margin of 30%, this rigid switching method actually wastes the available capacity on the backup line and fails to fully utilize the stress effects of various distributed power sources and energy storage devices.
[0008] It can be seen from this that the current passive lightning protection measures of the power system mainly have the following limitations: 1) The cost of equipment is high, and it increases with the increase in the scale of power grid equipment; 2) The success rate of lightning protection for transmission lines is low; 3) There is no early warning, and there is almost no time reserved to deal with the fault; 4) The load is cut off directly after a trip occurs, causing large-scale power outages and economic losses; 5) A large number of load disconnections in a short period of time have a greater impact on the system
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Embodiment 1
[0036] Embodiment 1: A source-network-load-storage control and load flexible switching method in lightning weather, including a preparation stage and an implementation stage.
[0037] 1. Preparation stage
[0038] The classification results are obtained by classifying the loads in the power grid (power system in the region) according to their importance in advance. Usually, the loads are divided into important loads, secondary important loads and general loads in descending order of importance.
[0039] Important loads mainly include two types, one is the load that has a major impact on production and operation activities and will cause major economic losses in case of a power outage, such as blast furnaces in steel mills and spinning machines in textile mills; the other is loads that have significant impact on social operations. Loads with significant impact, such as hospital operating rooms, urban subway lines, high-speed rail lines, etc. Sub-important loads mainly refer to...
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The invention relates to a power-grid-load-storage control and load flexible switching method in lightning climate, comprising the following steps of 1: detecting lightning and predicting the locationand the time of a lightning strike to obtain a lightning prediction result; 2: determining a transmission line in a power grid that may be struck by the lightning according to the lightning prediction result; and 3: determining a load transfer plan and transferring at least a part of the load on the transmission line that may be struck by the lightning to a standby transmission line and / or a distributed micro-grid and / or an energy storage device according to the load transfer plan before the occurrence of lightning. The method can transfer the load of the power grid in advance in view of thelightning, thereby reducing a load loss that may be caused by the lightning and improving the operation stability of the power grid. The method has a low implementation cost.
Description
technical field [0001] The invention belongs to the field of lightning protection and load control, and is a lightning comprehensive protection strategy combined with lightning prediction, distributed power source control and fast switching of grid load. Background technique [0002] Lightning has always been an important natural factor that endangers the safety of power grid operation. Every year, more than 30% of blackouts in the United States, and more than half of power grid disturbances and blackouts in Europe are caused by lightning. In my country, more than half of the blackouts in coastal provinces are caused by lightning. As the scale of the power grid continues to increase, the impact of lightning on the power grid is becoming more and more significant. For our country, the southeast coast has always been a lightning-prone area, and these areas happen to be the load center of our country. Due to the extremely high load density of the power grid, a thunderstorm i...
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IPC IPC(8): H02J3/00H02J3/06H02J3/28H02J3/38
CPCH02J3/06H02J3/28H02J3/381H02J3/0073
Inventor 徐洋蔡云峰王宁童充戴康周新磊麦锦雯苗键强苏俊霖
Owner JIANGSU ELECTRIC POWER CO