Fan controllable frequency droop control method suitable for various wind power permeabilities
A technology of frequency droop and control method, applied in wind power generation, electrical components, circuit devices, etc., can solve problems such as insufficient frequency regulation capability of the system, wind turbine instability, etc. The effect of commercial development
Pending Publication Date: 2020-09-29
NANTONG UNIVERSITY
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Problems solved by technology
The invention effectively releases the rotational kinetic energy of the fan, so that the doubly-fed wind power generation unit actively participates in system frequency regulation; the self-defined frequency droop control coefficient changes with the fan speed and wind power penetration rate, and realizes controllable frequency droop control, solving the problem of wind turbine Instability, insufficient system frequency regulation capability and overshoot problems, provide response time for the synchronous generator set to start a frequency regulation, and assist the synchronous generator to curb frequency changes
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[0036] The present invention will be described in detail below in conjunction with the accompanying drawings for further explanation, so that those skilled in the art can understand the present invention more deeply and can implement it, but the following examples are only used to explain the present invention, not as the present invention limit.
[0037] Such as figure 1 As shown, a wind turbine controllable frequency droop control method suitable for various wind power penetration rates includes the following steps: S1: Calculate the instantaneous frequency of the system grid according to the voltage at the common coupling point between the wind farm and the grid, and determine whether the instantaneous frequency of the grid exceeds the set value. The specified dead zone range; if it exceeds the set dead zone range, start the frequency droop control; if it is within the set dead zone range, continue to work in the maximum power tracking control;
[0038] S2: Calculate the f...
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The invention particularly relates to a fan controllable frequency droop control method suitable for various wind power permeabilities and belongs to the technical field of renewable energy grid connection. By adding frequency droop control in a fan rotor side control loop, active power loss of a rotary kinetic energy compensation system stored in a fan is released briefly. A droop control coefficient rises along with the increase of the rotating speed of the rotor, that is, when the rotating speed of the rotor is high, the rotating kinetic energy is fully released to compensate active loss ofthe system, and when the rotating speed of the rotor is low, a proper amount of rotating kinetic energy is released to compensate active loss of the system, and a problem of instability of the rotating speed of the fan and serious secondary frequency drop are not caused, besides, the droop control coefficient is reduced along with the increase of the wind power permeability, so the frequency overshoot phenomenon during high wind power permeability is avoided, the grid-connected capability of the fan and the frequency modulation capability of the system can be improved, the guarantee is provided for high wind power grid connection, the use of an energy storage device for frequency modulation is reduced, and commercial development of wind power generation is promoted.
Description
technical field [0001] The invention specifically relates to a wind turbine controllable frequency droop control method applicable to various wind power penetration rates, and belongs to the technical field of renewable energy grid connection. Background technique [0002] With the increasing wind power grid-connected capacity, due to the control strategy, there is no coupling relationship between the speed of the wind turbine and the system frequency, resulting in a decline in the system's rotational inertia and frequency modulation capability. When the active power imbalance occurs in the system, it is easy to cause the frequency deviation to exceed the safe range, and even start the low frequency load shedding device. In the case of the same capacity, the inertia constant of the doubly-fed wind turbine is greater than that of the synchronous generator, and it has a wide operating speed range. Therefore, double-fed fan can be regarded as an effective means of system frequ...
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Login to View More IPC IPC(8): H02J3/48H02J3/38
CPCH02J3/48H02J3/381H02J2300/28Y02E10/76
Inventor 杨德健张雷张新松华亮
Owner NANTONG UNIVERSITY