A Method of Correctly Selecting and Switching Generators and Loads After a Regional Power Network Fault
A technology for regional power grids and generators, applied in electrical components, circuit devices, AC network circuits, etc., can solve problems such as accident expansion, slow control measures, and power grid blackouts, so as to maintain system stability, ensure effectiveness, and improve power supply. The effect of reliability
Inactive Publication Date: 2018-06-19
WUHAN UNIV
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[0004]If the safety and stability control device fully considers the instability of the generators in the system into two groups when selecting the control object, it does not consider the energy characteristics of the forward and backward groups , it is possible to cut off the generator in the backward fleet, and shed the load in the forward fleet. This kind of wrong control will lead to the expansion of the accident, and even lead to a blackout of the power grid; and the traditional control measures use round-by-round machine shedding , in order to achieve system stability, the control measures are relatively slow, and it cannot meet the requirement of minimum cutting load
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[0024] Specific embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. Such as figure 1 As shown, the specific implementation method adopts the following technical solution, a method for correctly selecting and cutting generators and loads after solving a regional power grid failure, including the following steps:
[0025] S1. Determine the machine and load shedding area:
[0026] S11. Measure the frequency, electromagnetic power, mechanical power and power angle of the generator;
[0027] S12. At the current moment, calculate the power angle difference δi-δj of the two generators one by one, compare and judge with the engineering value 300°, if the power angle difference δi-δj of the two generators≤300°, then the two generators Divided into the same group, it is called a coherent unit; if the power angle difference of two generators δi-δj>300°, the two generators are divided into different groups, called a non-...
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The invention relates to the electric power system and automation technology field and especially relates to a method of correctly switching an electric generator and a load after solving a regional power grid failure. The method comprises the following steps of determining a cutting machine load shedding area and determining a cutting machine load shedding amount, wherein cutting machine load shedding area determination comprises of measuring a system electric generator fault electric quantity; carrying out coherency grouping on the electric generator; identifying a forward machine group and a backward machine group; cutting machine load shedding amount determination comprises of carrying out equivalent calculation on the fault electric quantity; calculating a maximum deceleration area; and calculating kinetic energy acquired from a fault process. A main function of a control strategy in the invention is that the electric generator and the load which need to be cut after a regional power grid has a fault are accurately identified and a size of a cutting amount is determined; and validity of safe and stable control measures is ensured so as to maintain system stabilization and increase power supply reliability.
Description
technical field [0001] The invention belongs to the technical field of electric power systems and automation thereof, and in particular relates to a method for correctly selecting and cutting generators and loads after a regional power grid fails. Background technique [0002] In power system transient stability control, if the system still cannot guarantee stable operation after the fault is removed, machine and load shedding measures are needed. Therefore, accurately finding the control point and determining the control amount are the keys to ensure the system restores stability. [0003] The grid structure of the power grid in some areas is as follows: figure 2 In the situation shown, the power plant B is connected to the main network of the power grid through the double-circuit line 4, and the lines Ⅰ and Ⅱ of the line 4 are the main connection lines. Power plants A and B have 6 generators, and substations C, D, and E have large loads. When a permanent ground short-cir...
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IPC IPC(8): H02J3/00H02J3/38
CPCH02J3/00H02J3/381
Inventor 刘佳乐唐旭辰
Owner WUHAN UNIV