Wind power generation system reliability estimating method considering voltage drop of power grid
A grid voltage and wind power system technology, applied in wind power generation, electrical components, circuit devices, etc., can solve problems such as wind turbines not having constant voltage operation mode, grid secondary impact, wind farm power output capacity, etc.
Active Publication Date: 2012-04-25
STATE GRID ELECTRIC POWER RES INST
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Problems solved by technology
Its particularity is mainly manifested in two aspects: 1) The characteristics of strong randomness and poor controllability of wind power will put forward new technical requirements for power grid dispatching and operation control; , and will remain in this way for a period of time in the future. Disturbances and faults of the power grid, especially the problem of voltage drop, will have an impact on the power output capability of the wind farm, and even cause a large area of wind turbines to go off-grid, causing secondary damage to the power grid. shock
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example 1
[0045] The invention is used in the IEEE-RTS79 system to compare and analyze the traditional reliability index and the modified reliability. The IEEE-RTS79 system has 24 system nodes and 38 lines, including 10 generator nodes and 17 load nodes, with a total of 32 generator sets. The total installed capacity is 3 405 MW, and the maximum load of the system is 2 850 MW. The system includes two voltage levels, 230 kV and 138 kV respectively, two 230 kV / 138 kV substations, five step-down transformers, with a total capacity of 2000 MVA. The load adopts the annual load model provided by IEEE-RTS79, and the probability distribution of wind speed adopts Weibull distribution. The traditional power supply of bus7 is replaced by a wind farm with the same capacity, and the average wind speed of the wind farm is set to 8m / s.
[0046] First, according to formula (1) - formula (3), the expected value of power shortage in the reliability evaluation index of traditional power system that does n...
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The invention relates to a wind power generation system reliability estimating method considering voltage drop of a power grid and low-voltage ride through capability of a wind-driven generator unit. The wind power generation system reliability estimating method is characterized by comprising the following five steps of: establishing a typical model for estimating the reliability of a wind power generation system, introducing a reliability index of the wind power generation system to a reliability index of a traditional power system, correcting the reliability index of the wind power generation system by considering the drop degree of the power grid, secondly correcting the reliability index of the wind power generation system by considering the low-voltage ride through capability of the wind-driven generator unit, and estimating the reliability of the wind power generation system. According to the wind power generation system reliability estimating method considering the voltage drop of the power grid, disclosed by the invention, the reliability estimation index of the traditional power system is suitably improved, the voltage drop degree of the power grid and the low-voltage ride through capability of the wind-driven generator unit are quantized as the reliability index of the wind power generation system, the reliability estimation of the wind power generation system better matches the practical situation that wind power is connected to the power grid, and important evidence and reference can be provided for the determination of an operation control manner of the power grid after the wind power is connected to the power grid.
Description
technical field [0001] The invention relates to an evaluation method for the reliability of a wind power generation system, which belongs to the technical field of wind farm planning and operation control in new energy power generation technology. Background technique [0002] With the rapid development and maturity of wind power technology, the large-scale application of wind power has become an important part of my country's new energy development strategy. With an increasing trend, such a large-scale centralized connection of wind power will inevitably bring new problems and challenges to the power grid, such as increased pressure on power grid peak regulation and frequency regulation, increased difficulty in grid voltage control, and increased risk of safe and stable operation of the power grid. Therefore, it is necessary to study the power generation reliability of wind power generation system in depth, so as to provide reference for the planning and operation control of...
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IPC IPC(8): H02J3/00H02J3/38
CPCY02E10/763Y02E10/76
Inventor 陈宁朱凌志
Owner STATE GRID ELECTRIC POWER RES INST