Comprehensive control method of voltage sag based on supply and demand coordination
A technology of comprehensive treatment and voltage sag, which is applied in the direction of AC network voltage adjustment, electrical components, circuit devices, etc., can solve the problems of waste of management resources and the inability to choose reasonable treatment measures, so as to improve reliability and safety, and improve user The effect of power quality
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Embodiment 1
[0044] Sensitive user loss estimation
[0045] The formulation of voltage sag control strategy should pay attention to both user loss and sag control cost. In order to evaluate the economic loss caused by voltage sag to sensitive users, it is necessary to randomly estimate the voltage sag of sensitive load busbars when the actual measurement data is difficult to obtain. The Monte Carlo method is often used to solve the randomness problem of the power system. The Monte Carlo method is used to randomly predict the fault of the power grid, and the fault type, fault location and fault duration are selected as random variables, and the fault impedance is ignored.
[0046] Fault type
[0047] The frequency of various types of faults P(FT t ) can be expressed by formula (1):
[0048]
[0049] In the formula: P fs (s=1, 2, 3, 4) represent the number of single-phase to ground short-circuit, two-phase to ground short-circuit, two-phase short-circuit and three-phase short-circuit ...
Embodiment 2
[0095] This embodiment 2 is the specific application of the voltage sag control method based on the coordination of supply and demand in embodiment 1. Taking the IEEE30 node system as an example for simulation analysis, the system includes two voltage level lines of 132kV and 33kV, and has 6 generator sets, 30 busbars, 37 lines and 4 transformers, it is assumed that all transformers use Y0 / Y0 wiring. The probability of occurrence of different types of faults in IEEE30 system is shown in Table 1.
[0096] Table 1 IEEE30 system line failure rate
[0097]
[0098]
[0099] In order to study the loss of sensitive users, the following assumptions are made for the data of industrial users’ voltage sag loss data, the expected value of single sag loss and load capacity of typical industrial users, as shown in Table 2. Use the voltage withstand curve of typical industrial sensitive users, such as figure 2 shown.
[0100] Table 2 Single sag loss and load capacity of typical in...
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