Power control method and system for wind farm unit to participate in frequency modulation and voltage regulation
A power control, frequency and voltage regulation technology, applied in the direction of reducing/preventing power oscillation, photovoltaic power generation, electrical components, etc., can solve the problems of poor control accuracy and slow control speed, and achieve fast control speed, high reliability and high precision. Effect
Active Publication Date: 2019-03-19
ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER +3
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[0004] The purpose of the present invention is to provide a power control method and system in which wind farm units participate in frequency regulation and voltage regulation, which are used to solve the problems of slow control speed and poor control accuracy caused by only one frequency regulation in the prior art, and wind farm units participate in regulation. pressure problem
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[0032] The specific embodiments of the present invention will be further described below in conjunction with the accompanying drawings.
[0033] The wind farm network structure applied to the power control method of wind farm units participating in frequency modulation and voltage regulation of the present invention is as follows: figure 1As shown, the wind farm network includes multiple units, and each unit is connected to the grid through a transformer. The communication of the wind farm network adopts the station monitoring communication ring network and the PLC high-speed optical fiber communication ring network, and each unit is connected through the station monitoring communication ring network. The photoelectric conversion network switch, the photoelectric conversion network switch and the wind farm monitoring system are connected in communication, and the wind farm monitoring system is connected in communication with the power system dispatching center.
[0034] One of...
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The invention relates to a power control method and a system for a wind farm unit to participate in frequency modulation and voltage regulation, which belongs to the field of circuit devices of an alternating current distribution network. The method comprises the steps that primary frequency modulation is carried out through active-frequency sag control; and when primary frequency modulation doesnot meet a frequency modulation requirement, secondary frequency modulation is carried out through AGC control. Primary frequency modulation is used as an active adjustment function under the condition of frequency fluctuation, and mainly relies on the condition of a wind farm to realize adaptive adjustment control of the system. AGC control assumes the secondary adjustment function of a power system. Complete frequency modulation capability of the wind farm is realized through primary frequency modulation and secondary frequency modulation. The method has the advantages of fast control speed,high precision and high reliability. At the same time, the invention further carries out primary voltage regulation through reactive-voltage regulation sag control. When primary voltage regulation does not meet a voltage regulation requirement, secondary voltage regulation is carried out through AVC control to realize grid-connected voltage adjustment.
Description
technical field [0001] The invention belongs to the field of circuit devices for AC power distribution circuits, and in particular relates to a power control method and system for wind farm units to participate in frequency and voltage regulation. Background technique [0002] In recent years, with the rapid development of global wind power technology, the penetration rate of wind power in power grids in some areas of my country has exceeded 20%. The inherent randomness, intermittency and volatility of wind power make large-capacity wind farms have adverse effects on the dynamic stability of the power grid, frequency regulation and voltage regulation. The control and grid-connected principle of wind power lead to the decoupling of its mechanical power and electromagnetic power, and the decoupling of its rotational speed and grid frequency, thus losing the fast and effective response to the grid frequency, so that the "implicit inertia" in the rotational kinetic energy has a ...
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IPC IPC(8): H02J3/46H02J3/38H02J3/48H02J3/50H02J3/24
CPCH02J3/383H02J3/24H02J3/46H02J3/48H02J3/50Y02E10/56
Inventor 王建伟高亚春于永军程林志王开科郝红岩苏凤宇祁晓笑罗忠游王朝东
Owner ELECTRIC POWER SCI RES INST OF STATE GRID XINJIANG ELECTRIC POWER
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