JPH0419366A - Pitch controller for vane-wheel power generation facilities - Google Patents

Abstract

PURPOSE:To eliminate the use of a rotational-speed controlling system to achieve reduction in the facilities cost by controlling the pitch angle of a vane so as not to exceed a rated load in the vane-wheel power generation facilities of DC link type. CONSTITUTION:A vane pitch angle signal (b) from a vane pitch angle detector is supplied to a vane pitch angle correction signal function calculator 1 to calculate a vane pitch angle signal correction signal (c). This correction signal (c) and a power generator output signal (a) issued from a power generator output detector are supplied to a signal adder 2 to calculate a wind velocity signal (d). Further, the wind velocity signal (d) thus calculated is supplied to a pitch angle instruction signal function calculator 3 where a pitch angle instruction signal (e) is calculated, the signal (e) being supplied to a signal selector 4. Then, either one of the pitch angle instruction signal (e) and a pitch angle instruction signal (f) at the time of start or stop is selected and outputted to a vane pitch angle cylinder 5, whereby control is made of the vane pitch angle so as not to exceed a rated level of load.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a pitch control device for wind turbine power generation equipment.

(Conventional technology) In wind turbine power generation equipment, the AC power generated by a synchronous generator is first converted to DC using an inverter (reverse conversion device), and then the frequency of the connected system is reconverted to AC of the same frequency. and then supply it to the power grid of the linked system. D this
It is called the CIJ rank method. When making the turbine speed variable in order to effectively utilize wind energy, the voltage and frequency of the synchronous generator fluctuates, making it impossible to connect it in parallel with a commercial power source. Therefore, the inverter is used to control the voltage and frequency to be constant.

(Problem to be Solved by the Invention) When the above-mentioned AC link method is adopted for wind turbine power generation equipment, in order to maintain one rotation speed constant, the following rotation speed control device, that is, the centrifugal force that fluctuates due to changes in the three rotation speeds, is required. Therefore, it is necessary to use a rotational speed control device that automatically regulates the three rotational speeds by controlling the blade pitch, which raises the problem of increased equipment costs.

Another power generation method is the AC link method. This AC link system uses an induction generator as an AC generator in wind power generation equipment linked to the 7 AC power system.
This method sends AC output to the power grid. induction generator is
It is driven by a wind turbine above its periodic speed, and its slip changes according to the turbine output, automatically increasing or decreasing the output due to changes in wind speed. Although the rotational speed of the turbine fluctuates slightly, it is close to a constant speed, which is disadvantageous in terms of effective use of wind energy, but it does not require an inverter.
This has the advantage of reducing losses and equipment costs. Note that the AC'Jink system also includes a system in which the rotational speed is kept constant through pitch control, a synchronous generator is driven, and AC power is directly supplied without using an inverter.

The present invention has been proposed in view of the above-mentioned problems, and its purpose is to provide a pitch control device for AC link type wind turbine power generation equipment that can eliminate the need for a two-rotation speed control device and reduce equipment costs. The point is to try.

(Means for Solving the Problems) In order to achieve the above object, the pitch control device for wind turbine power generation equipment of the present invention provides a blade pitch angle signal based on a blade pitch angle signal manually inputted from an R pitch angle detector. A blade pitch angle correction signal function calculator for calculating a correction signal, a generator output signal inputted from the generator output detector 9, and a blade pitch angle signal correction signal inputted from the blade pitch angle correction signal function calculator 9. A signal adder that calculates a wind speed signal by adding, a pitch angle command signal function calculator that calculates a pitch angle command signal based on the wind speed signal from the signal adder, and a pitch angle command signal function calculator that calculates a pitch angle command signal based on the wind speed signal from the signal adder. The low signal selector selects either one of the manually input pitch angle command signal and the pitch angle command signal at the time of starting and stopping, and outputs the selected signal to the blade pitch angle cylinder.

(Function) The pitch control device for wind turbine power generation equipment of the present invention is configured as described above, and inputs the blade pitch angle signal from the blade pitch angle detector to the blade pitch angle correction signal function calculator. The blade pitch angle signal correction signal is calculated using 1. Next, this blade pitch angle signal correction signal and the generator output signal of the generator output detector are input to a signal adder, and the wind speed signal is calculated using these signals. 1. Next, the wind speed signal from the signal adder is inputted to a pitch angle command signal function calculator, where a pitch angle command signal is calculated using this wind speed signal. 5. Next, this pitch angle command signal is input to a low signal selector. Here, select either one of this pitch angle command signal and the pitch angle command signal at startup and stop.
This is output to the blade pitch angle cylinder to adjust the blade pitch angle so as not to exceed the rated load.

(Example) Next, the pitch control device for wind turbine power generation equipment of the present invention will be explained using an example shown in FIG. 1. (1) is based on the blade pitch angle signal (b) input from the blade pitch angle detector. A function calculator for the blade pitch angle correction signal (c) calculates the blade pitch angle correction signal (c), and (2) a function calculator for the blade pitch angle correction signal and the generator output signal (a) input from the generator output detector. A signal adder (3) calculates the wind speed signal (d) by adding the blade pitch angle signal correction signal (c) input from the calculator (1); ), the pitch angle command signal function calculator (4) calculates the pinch angle command signal (e) based on the pitch angle command signal (e), which is activated when the pitch angle command signal (e) is input from the pitch angle command signal function calculator (3). Pitch angle command signal (f
) and outputs it to the blade pitch angle cylinder (5).

Next, the operation of the pitch control device for wind turbine power generating equipment shown in FIG. 1 will be specifically explained. The blade pitch angle signal (b) from the blade pitch angle detector is input to the blade pitch angle correction signal function calculator (1), where the blade pitch angle signal correction signal (c) is calculated. Pitch angle signal correction signal (c) and generator output signal of generator output detector (a)
are input to the signal adder (2), where the wind speed signal (d) is calculated using these signals (c) and (a), and then the wind speed signal (d) from the signal adder (2) is The pitch angle command signal (e) is input to the pitch angle command signal function calculator (3), where the pitch angle command signal (e) is calculated using this wind speed signal (d). (4), and here this pitch angle command signal (e
) and the pitch angle command signal (f) at startup and stop.

Select one and set it to the blade pitch angle cylinder (5
) to adjust the blade pitch angle so as not to exceed the rated load.

The above action will be explained in more detail. The electric power generated by a wind turbine generator is determined by the blade pitch and wind speed. In order to keep the generated power constant, it is necessary to change the blade pitch angle because wind speed is a variable natural energy source. Third
To obtain the rated output from the figure, when the wind speed is Vll/s, set the blade pitch to X degrees.

Further, when the wind speed is Vzm/s, this becomes possible by controlling the blade pitch to X2 degrees. Therefore, by controlling the blade pitch according to the wind speed, the rated output can be maintained. For this reason, accurate wind speed data is required. However, the observation area of a general anemometer is spot-on and is far smaller than the area that receives the wind from a wind turbine. In addition, the energy received by the wind turbine differs depending on the installation position of the anemometer, its height, the distance in front of and behind the wind turbine, etc. Also, depending on the topography upwind, turbulence occurs, and the energy received by the blades varies depending on the position of the wind surface, so the anemometer data.

It cannot be used as the wind speed experienced by a windmill.

In order to accurately measure the wind energy captured by the entire wind turbine blade, the wind turbine is regarded as one anemometer and the wind speed is calculated from the generated power and the blade pitch. This wind speed is the average value of the wind energy captured by the entire wind turbine blade. From Figure 3, Y
, if the blade pitch χ, deg, then the wind speed is V+
m/s, and if the blade pitch is X2deg at Y and KW, the wind speed is V, n+/s, and the wind speed is calculated. In this relational expression, +VS is the wind speed, - is the generated output (generator output signal), k is the air density (a constant determined by wind turbine performance, etc.), and Pk is a variable constant depending on the blade pitch angle.

Vs=KWXk+Pk become. This is shown in Figures 1 and 2.

Above, the wind speed signal (d) obtained by the signal adder (2)
is input to the pitch angle command signal function calculator (3) and
Here, a pitch angle command signal (e) is calculated using this wind speed signal (d). In addition, the pitch angle command signal (e)
is manually input to the low signal selector (4), and here this pitch angle command signal (e) and the pitch angle command signal at startup and stop (
f) Select one of these and output it to the blade pitch angle cylinder (5) to adjust the blade pitch angle so as not to exceed the rated load. Note that the pitch angle command signal (f) at the time of starting and stopping outputs the maximum outputtable pitch angle at the time of starting, and outputs the pitch angle at the time of feathering when stopped.

(Effect of the Invention) As described above, the pitch control device for wind turbine power generation equipment of the present invention inputs the blade pitch angle signal from the blade pitch angle detector to the blade pitch angle correction signal function calculator, and then inputs the blade pitch angle signal from the blade pitch angle detector to the blade pitch angle correction signal function calculator. Calculate the angle signal correction signal.

Next, this blade pitch angle signal correction signal and the generator output signal of the generator output detector are input to a signal adder, where a wind speed signal is calculated based on these signals, and then the wind speed signal from the signal adder is calculated. is input to the pitch angle command signal function calculator, and the pitch angle command signal is calculated using this wind speed signal.

Next, this pitch angle command signal is input to the low signal selector, which selects either this pitch angle command signal or the pitch angle command signal at startup/stop, and sends it to the blade pitch angle cylinder. Since the pitch angle of the blades is adjusted so that the output does not exceed the rated load, it is possible to eliminate the need for a single rotation speed control device, which has the effect of reducing equipment costs for AC link type wind turbine power generation equipment.

[Brief explanation of drawings]

FIG. 1 is a system diagram showing an embodiment of the pitch control device for wind turbine power generating equipment according to the present invention, and FIGS. 2 and 3 are diagrams illustrating its operation. (1) ... Function calculator for blade pitch angle correction signal (
2)... Signal adder, (3)... Function calculator for pitch angle command signal, (4)... Signal selector, (5)...
- Blade pitch angle cylinder, (a)... Generator output signal, (b)... Blade pitch angle signal, (C)... Pitch angle signal correction signal, (d)... Wind speed signal, ( e)...
- Pitch angle command signal, (r)... Pitch angle command signal at the time of starting and stopping.

Claims (1)

[Claims] a blade pitch angle correction signal function calculator that calculates a blade pitch angle signal correction signal based on a blade pitch angle signal inputted from a blade pitch angle detector; a generator output signal inputted from a generator output detector; and a generator output signal inputted from a generator output detector; A signal adder that calculates a wind speed signal by adding the blade pitch angle signal correction signal input from the pitch angle correction signal function calculator; and a signal adder that calculates a pitch angle command signal based on the wind speed signal from the signal adder. Select one of the pitch angle command signal input from the pitch angle command signal function calculator, the pitch angle command signal input from the pitch angle command signal function calculator, and the pitch angle command signal at startup and stop, and use this as the blade pitch angle. A pitch control device for wind turbine power generation equipment, characterized by comprising a low signal selector for outputting to a cylinder.