JP2002062942A - Control device for independent power source by wind power generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To smoothly operate the starting rotation of a wind power generator from low wind velocity, to control the current-carrying ratio so that the wind power generator can be laid in a load state capable of taking a maximum output without stalling, and to increase the output current of the wind power generator to charge a storage battery. SOLUTION: The wind power generator is connected to a voltage adjustor for keeping secondary voltage constant even in the fluctuation of primary voltage through a connection part for connecting and controlling the output from the wind power generator. The charging current to the storage battery is controlled by the output voltage of the wind power generator. The charging output to the storage battery is outputted from a current-carrying rate adjuster.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charge control device for an independent power source that converts natural wind energy generated by a wind power generator into electric energy and uses a storage battery to operate an electric load.

[0002]

2. Description of the Related Art Wind power generators and solar cells are used as power sources for night lighting in parks, monuments in park facilities, seismometers, rain gauges, and telemeters in places where it is difficult to draw commercial power, such as in mountainous remote areas and remote islands. Hybrid power supplies in combination with generators are becoming widespread.

Heretofore, when an AC output of a wind power generator is rectified and this output is supplied to a storage battery to charge the storage battery, a voltage of the storage battery is detected, and when the battery reaches a full charge voltage, the charging device cuts off a charging current. Is commonly used.

When the wind power generator starts to rotate at the starting wind speed and a wind stronger than the cut-in wind speed blows and the rotation speed of the wind power generator increases, the output voltage of the wind power generator becomes higher than the terminal voltage of the storage battery. In the storage battery, all the voltage rises flow,
The wind generator becomes overloaded and stalls, reducing the output.

When the wind power generator is controlled by the above-mentioned charger, 6
At wind speeds of ~ 7m / s or less, the brakes are applied,
It only turns slowly. When the wind speed was about 8 m / s or more, it often did not rotate at the normal rotation speed.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-described problems, and it is intended to smoothly start a wind power generator, and to reduce a wind power generator from a low rotation to a high rotation. The purpose is to eliminate stall due to overload and to charge the storage battery with the output of the wind generator to increase the charging efficiency.

[0007]

The wind generator is not loaded until the wind generator rotates at 150 to 300 rpm due to an increase in wind speed. Detecting an output voltage associated with the number of revolutions of the wind power generator, and
When the rotation speed is equal to or higher than rpm, the load is automatically connected. Further, the load on the wind power generator is gradually increased in accordance with the rotation speed at the rated output of the wind power generator from the rotation speed at which the load is connected. The output of the wind power generator is charged by increasing the current by the voltage regulator.

When the rotation speed is plotted on the horizontal axis and the output is plotted on the vertical axis, and the output and the rotation speed are represented by using the wind speed as a parameter, a curve as shown in FIG. 1 appears, which is generally called an operation curve of a wind turbine by a windmill. I have. In general, a wind power generator by a windmill shows a maximum rotation speed at no load as represented by a curve A,
As the load increases, the speed decreases. However, at a certain rotation speed, the load is balanced and the rotation speed is maintained. When the load increases, the output and the number of revolutions decrease as shown at the point S, and the blade of the wind turbine stalls. Now, consider a case in which a windmill and a generator are connected and driven. First, assuming that the wind turbine drives a generator having a rated rotation speed Nn, a rated output Ln is generated when the wind speed is Vn. If the wind speed drops to V1, the output decreases and becomes L1.

[0009]

[Operation] Since the wind power generator is started with no load, the starting wind speed starts from a low wind speed. An optimum load is applied to the rotation speed of the wind power generator, so that the wind power generator does not stall and can take out the maximum output according to the rotation speed. At the time of rated output by the voltage regulator, the output from the wind power generator is input to the voltage regulator as a large voltage and a small current, and is taken out as a constant voltage and a large current, thereby increasing the charging current to the storage battery.

[0010]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a block diagram for explaining the principle of the present invention. FIG. 3 is a block diagram of the duty ratio adjuster.

The present invention is controlled by a connection unit, a voltage regulator, and a duty ratio adjustment unit as shown in FIG. The connecting part divides the output of the wind power generator to one tenth in the duty ratio adjusting part, performs a differential amplification by the high common mode voltage unity gain amplifier, and detects a voltage of 40 V or more by the comparison circuit 2 in FIG. Then, the connection is controlled using a relay, a power FET, an insulated gate bipolar transistor (IGBT) or the like in the connection portion. The voltage regulator rectifies the output of the wind power generator to DC when the output is AC. Input voltage range is 0 to 150
Even if the voltage fluctuates by about V, the output voltage is kept constant at a voltage at which the charging current flows to the storage battery. The voltage higher than the fixed voltage is compressed, and the compressed current increases the output current.

The duty ratio adjuster controls the duty ratio for energizing the output of the voltage adjuster to the storage battery in conjunction with the output voltage (rotation speed) of the wind power generator. The sawtooth oscillation circuit is 5KHz-5
A sawtooth wave having a constant frequency of about 0 KHz is generated. Further, the waveform is converted by the waveform shaping circuit shown in FIG. The signal passed through the high common-mode voltage unity gain amplifier and the output signal of the waveform shaping circuit are input from the output of the wind power generator to the comparison circuit 1 of FIG. 3 to generate a rectangular wave output shown in FIG. The ratio between the energization and the energization interruption of the rectangular wave changes in relation to the output of the wind power generator. When the power generation voltage of the wind power generator is 40 V or less, the current is zero, and when it is 60 V or less, the current is full. 4
From 0V to 60V, 0 to 100% gradually increasing duty ratio (P
WM).

The present invention is not limited to the above embodiment, but can be modified and implemented without changing the gist.

[0014]

According to the present invention, the start of the wind power generator can be made smooth, and the maximum output of the wind power generator at each wind speed can be taken out. It can be charged and is extremely economically effective.

[Brief description of the drawings]

FIG. 1 is an operation curve diagram of a wind power generator using a general wind turbine showing the effectiveness of the present invention.

FIG. 2 is a block diagram of the present invention.

FIG. 3 is a configuration diagram of a duty ratio adjuster.

FIG. 4 is a time chart showing the duty ratio in the present embodiment.

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Claims (1)

[Claims] 1. The natural wind energy is converted into electric energy by a wind generator, and the output is used to operate an electric load and charge a storage battery. When there is no electric output from the wind generator, the storage battery is used. In the independent power supply system for operating the electric load, the charge control circuit of the storage battery keeps the voltage of the wind power generator fluctuating large through the voltage regulator, and further supplies electricity between the output of the voltage regulator and the storage battery. A control device for an independent power supply, wherein a rate regulator is arranged, and the duty ratio of the duty ratio regulator is automatically adjusted to a maximum output point of the wind power generator in conjunction with an output voltage of the wind power generator.