JPH06169598A - Generator system by natural energy - Google Patents

Abstract

PURPOSE:To average generating power to be stabilized by adding outputs of a plurality of generating means, supplying it as generating power to a power source, detecting the added generating output, and controlling to output it based on its variation. CONSTITUTION:Wind turbines 1-1,..., n are rotated by wind, and mechanical energy generated by the rotations is supplied to induction generators 2-1,..., n, and converted to AC power. Then, converters 3-1,..., n rectify and smooth outputs P1-Pn of the generators 2-1,..., n thereby to convert them into DC powers, adds them to input it to a power controller 6, and detects it by a detector 7. The controller 6 compares the added input EPn with a preset reference value PA, and controls to regulate a conversion efficiency for the converters 3-1,..., n. As a result, an added result of the output powers of the converters 3-1,..., n is further averaged, input to an inverter 4 to become an AC, and supplied to a system power source 5 as a generating power.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation system used for wind power generation or the like and generating power using natural energy.

[0002]

2. Description of the Related Art FIG. 3 shows a wind power generation system of this type of power generation system, and is a block diagram showing a configuration of a system in which an induction generator 2 and an inverter 4 are combined. In this figure, the windmill 1 converts wind energy into mechanical energy by rotating with the wind. This mechanical energy is converted into electric energy in the induction generator 2, that is, AC power of variable frequency. This AC power is converted into DC power by the converter 3 and is converted into AC power of a constant frequency in the inverter 4. Then, this AC power is supplied to the system power supply 5 as generated power.

[0003]

In the conventional power generation system described above, the generated power supplied to the system power supply is determined by the energy of the wind supplied to the wind turbine 1, that is, the natural energy. However, the generation of natural energy is irregular and varies greatly. Therefore, there is a problem in that the generated power supplied to the system power supply also fluctuates greatly and the amount of power is not constant.

The present invention has been made under such a background, and provides a power generation system using natural energy capable of averaging the generated power by minimizing fluctuations and obtaining stable generated power. With the goal.

[0005]

A power generation system using natural energy according to the present invention takes in natural energy,
A means for converting mechanical energy generated by the natural energy into electric energy, wherein a plurality of power generation means are provided, and a supply means for adding outputs of the plurality of power generation means and supplying the generated power to a power source, And a control means for detecting the added output of the power generation means and controlling the output of the plurality of power generation means based on the fluctuation of the output.

[0006]

According to the above structure, the output fluctuation can be reduced by adding the outputs of the plurality of power generating means.
Further, by detecting the variation of the addition result and controlling the outputs of the plurality of power generation means based on the variation, it is possible to further level the generated power supplied to the power source.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the configuration of a wind power generation system according to an embodiment of the present invention. In this figure, parts corresponding to those in FIG. 3 are assigned the same reference numerals and explanations thereof are omitted. In the wind power generation system shown in this figure, a plurality of wind turbines 1-1 to 1-n are installed for one set of inverter 4 and system power supply 5, and each wind turbine 1-
Induction generators 2-1 to 2-n and converters 3-1 to 3-n are provided for each of 1 to 1-n. This windmill 1-
Since 1 to 1-n are installed in different locations, the direction of the wind received and the wind force are also different. Therefore, each induction generator 2-1 to 2-1
The amount of mechanical energy supplied to 2-n also differs, and the output power of each induction generator 2-1 to 2-n also differs. The output terminals of converters 3-1 to 3-n are commonly connected, and the DC power that is the output of each is added before being input to inverter 4. As a result, even if the output powers of the converters 3-1 to 3-n are different and the respective fluctuations are large and irregular, the fluctuations are canceled by the addition of the respective ones, and the output powers have little temporal fluctuations. Becomes
A detector 7 detects the DC power input to the inverter 4 and sends it to the power control device 6. The power control device 6 sets the reference value of the output power, and the detector 7
The detection result obtained by (1) is compared with this reference value. If this detection result exceeds the reference value, each converter 3-
Control signals are sent to 1 to 3-n to reduce the conversion efficiency when converting AC power into DC power, and control is performed to reduce the output power of each. When the detection result is lower than the reference value, the converters 3-1 to 3-n are controlled to increase the output power. As a result, the further leveled DC power is input to the inverter 4. And
The inverter 4 converts the AC power into a constant frequency as in the conventional case and supplies the AC power to the system power supply 5.

The operation of the wind power generation system according to this embodiment will be described below. First, the wind turbines 1-1 to 1-n are rotated by the wind, and the mechanical energy generated by this rotation is supplied to the induction generators 2-1 to 2-n. Then, each induction generator 2-1 to 2-n converts this mechanical energy into AC power. 2A and 2B show examples of waveforms of output power of the induction generators 2-1 to 2-n. As shown in this figure, for example, the output P1 of the induction generator 2-1 is
The output Pn of the induction generator 2-n is as shown in FIG. 2B. Next, the converters 3-1 to 3-3-
n is converted into DC power by rectifying and smoothing the outputs P1 to Pn of the induction generators 2-1 to 2-n, respectively. Then, the DC power output from these converters 3-1 to 3-n is added before being input to the inverter 4. The added DC power is detected by the detector 7. An example of the detected waveform, that is, the input ΣPn of the inverter 4 is shown in FIG. The input ΣPn of the inverter 4 is supplied to the power control device 6.
Then, the power control device 6 compares this input ΣPn with a preset reference value PA. For example, as shown in FIG. 2C, when the input ΣPn exceeds the reference value PA, the power control device 6 causes each of the converters 3-1 to 3-n to convert AC power into DC power. Control to reduce conversion efficiency. On the contrary, when the input ΣPn is lower than the reference value PA, the power control device 6 controls the converters 3-1 to 3-n to
Control to increase conversion efficiency. As a result, the addition results of the output powers of the converters 3-1 to 3-n are further leveled. Then, the added DC power is applied to the inverter 4
To AC power, which is supplied to the system power supply 5 as generated power.

The following means may be used without being limited to the above embodiment. (1) In the above embodiment, the converter is provided for each induction generator, but circuits after the smoothing circuit of these converters may be shared. (2) In the above embodiment, the method of directly connecting the output of each converter was shown. However, when the output voltage is greatly different due to the difference in the capacity of the wind turbine, each converter is a chopper type DC-DC converter, and each converter is You may make it the output voltage of a converter become substantially the same value. (3) In the above embodiment, the system using the induction generator is shown. However, in the system using the DC generator, the smoothing circuit may be shared by using a chopper type DC-DC converter or the like. (4) The above embodiment can be applied not only to wind power generation but also to wave power generation.

[0010]

As described above, according to the present invention, there is provided a plurality of power generating means for taking in natural energy and converting mechanical energy generated by the natural energy into electric energy. Supply means for adding the outputs of the plurality of power generation means to supply to the power supply as generated power and output of the added power generation means are detected, and output control of the plurality of power generation means is performed based on the fluctuation of the outputs. Since the control means for performing is provided, there is an effect that the generated power can be averaged by minimizing the fluctuation and stable power generation can be obtained.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a power generation system using natural energy according to an embodiment of the present invention.

FIG. 2 is a waveform diagram showing an example of the output power of the induction generator and the input power of the inverter in the same example.

FIG. 3 is a block diagram showing a configuration example of a conventional power generation system using natural energy.

[Explanation of symbols]

 1-1 to 1-n Wind turbine 2-1 to 2-n Induction generator 3-1 to 3-n Converter 4 Inverter 5 System power supply 6 Power control device 7 Detector

Claims (1)

[Claims] 1. A means for taking in natural energy and converting mechanical energy generated by the natural energy into electric energy, wherein a plurality of power generating means and outputs of the plurality of power generating means are added to generate power. It is characterized by further comprising: a supply unit that supplies power to the power source; and a control unit that detects the output of the added power generation unit and controls the output of the plurality of power generation units based on the variation of the output. Power generation system using natural energy.