JP2015028694A5

JP2015028694A5 -

Info

Publication number: JP2015028694A5
Application number: JP2013157698A
Authority: JP
Filing date: 2013-07-30
Publication date: 2016-05-19
Anticipated expiration: 2033-07-30

Description

その後、日射の増加と共に発電量が増え、ステップＳ４０６で取得した発電電力Ｐ（Ｖ_ｄｃ）がある閾値Ｐ_ｍｉｎを超えると（ステップＳ４０７）、特性４、５に示すように最大電力点は_Ｖｍｉｎより高電圧側に位置することになるので、一定電圧制御から山登り法などの最大電力点探索に基づいた電圧指令値設定方法に移行する（ステップＳ４０８〜Ｓ４１７）。閾値となる電力Ｐ_ｍｉｎは、電圧がＶ_ｍｉｎの時に発電電力が最大となるような特性の最大電力である。図１６では特性３の最大電力点ＭＰＰ３の電力値（＝Ｐ_ｍｉｎ）が閾値となる。
Thereafter, the amount of power generation increases as the solar radiation increases, and when the generated power P (V _dc ) acquired in step S406 exceeds a certain threshold value P _min (step S407), the maximum power point is obtained from _{Vmin as} shown in characteristics 4 and 5. it means positioned on the high voltage side, the process proceeds to the voltage command value setting method based on the maximum power point search such as a constant voltage control or et hill-climbing method (step S408~S417). The threshold power P _min is the maximum power having such characteristics that the generated power is maximum when the voltage is V _min . In FIG. 16, the power value (= P _min ) of the maximum power point MPP3 of characteristic 3 is the threshold value.

Claims

An inverter that sets an operating voltage of the solar cell array and converts DC power output from the solar cell array into AC;
A measurement unit for measuring current and voltage output from the solar cell array;
A maximum power point tracking unit that calculates an operating voltage command value of the solar cell array based on the operating voltage and output current value of the solar cell array measured by the measuring unit;
The operation voltage value of the solar cell array obtained from the measurement unit is compared with the operation voltage command value of the solar cell array set by the maximum power point tracking unit, and proportional-integral control is performed based on the difference. An automatic voltage regulator,
A pulse width modulation signal generation unit that generates a gate signal of the inverter based on a current command value output from the automatic voltage adjustment unit;
From sunrise to sunset, including the case of low solar radiation, a power control unit that always controls by voltage command output by maximum power point tracking,
A control system for a photovoltaic power generation system.

In the control system of the photovoltaic power generation system according to claim 1,
The said power control part is a control system of a solar power generation system which sets the operating voltage of the said solar cell array by the said maximum power point tracking part also at the time of the electric power suppression of the said solar power generation system.

In the control system of the photovoltaic power generation system according to claim 2,
The said electric power control part is a control system of the solar power generation system which sets the operating voltage of the said solar cell array by the said maximum power point tracking part, also when keeping the control voltage of the said solar power generation system constant.

In the control system of the photovoltaic power generation system according to claim 2,
The operation lower limit voltage of the photovoltaic power generation system is a voltage threshold value, and the power value of the operation point such that the operation lower limit voltage becomes the voltage of the maximum power point has two threshold values,
When the release voltage of the photovoltaic power generation system is equal to or lower than the voltage threshold, the maximum power point tracking unit outputs 0 V as the operating voltage command value,
When the release voltage of the solar power generation system is equal to or higher than the voltage threshold value and the generated power of the solar power generation system is equal to or lower than the power threshold value, the maximum power point tracking unit is set to a predetermined constant as the operating voltage command value. Output the value
A control system for a photovoltaic power generation system that determines and outputs the operating voltage command value by maximum power point tracking control when the generated power of the photovoltaic power generation system is equal to or greater than the power threshold .

In the control system of the photovoltaic power generation system according to claim 2,
The power control unit has a voltage setting method by the maximum power point tracking unit and a voltage setting method at the time of power suppression in an operating voltage setting method of the solar cell array at the time of power suppression. A control system for a photovoltaic power generation system that determines a voltage setting method based on a comparison between a power suppression value and a power measurement value.

In the control system of the photovoltaic power generation system according to claim 2,
The power control unit has a voltage setting method by the maximum power point tracking unit and a voltage setting method at the time of power suppression in an operating voltage setting method of the solar cell array at the time of power suppression. A control system for a photovoltaic power generation system, which is selected from a list of power suppression values prepared in advance for a voltage setting method and voltage command values corresponding to the power suppression values.

In the control system of the photovoltaic power generation system according to claim 2,
In the control of the photovoltaic power generation system, the power control unit has a plurality of voltage command value setting methods at the time of canceling power suppression, and sets a voltage threshold value for switching the plurality of voltage command value setting methods to the solar power generation system. A control system for a photovoltaic power generation system, determined from the minimum starting voltage value.

In the control system of the solar power generation system according to claim 7,
The plurality of voltage command value setting methods include a binary search method and a hill-climbing method,
The said binary search method is a control system of a solar power generation system which determines the search width initial value of the said binary search method on the boundary of the voltage threshold value determined from the minimum starting voltage of the said solar power generation system.

An inverter that sets an operating voltage of the solar cell array and converts DC power output from the solar cell array into AC;
A measurement unit for measuring current and voltage output from the solar cell array;
A maximum power point tracking unit that calculates an operating voltage command value of the solar cell array based on the operating voltage and output current value of the solar cell array measured by the measuring unit;
The operation voltage value of the solar cell array obtained from the measurement unit is compared with the operation voltage command value of the solar cell array set by the maximum power point tracking unit, and proportional-integral control is performed based on the difference. An automatic voltage regulator,
A pulse width modulation signal generation unit that generates a gate signal of the inverter based on a current command value output from the automatic voltage adjustment unit;
A power control unit;
A solar power generation system control method comprising:
The said electric power control part is a control method of the solar power generation system which performs control of the said solar power generation system by the voltage command output by a maximum power point tracking always from the sunrise to the sunset including the case of a low solar radiation.

In the control method of the photovoltaic power generation system according to claim 9,
The said electric power control part is a control method of the solar power generation system which sets the operating voltage of the said solar cell array by the said maximum power point tracking part also at the time of the electric power suppression of the said solar power generation system.

In the control method of the solar power generation system according to claim 10,
The method for controlling a solar power generation system, wherein the power control unit sets an operating voltage of the solar cell array by the maximum power point tracking unit even when the control voltage of the solar power generation system is kept constant.

In the control method of the solar power generation system according to claim 10,
The operation lower limit voltage of the photovoltaic power generation system is a voltage threshold value, and the power value of the operation point such that the operation lower limit voltage becomes the voltage of the maximum power point has two threshold values,
When the release voltage of the photovoltaic power generation system is equal to or lower than the voltage threshold, the maximum power point tracking unit outputs 0 V as the operating voltage command value,
When the release voltage of the solar power generation system is equal to or higher than the voltage threshold value and the generated power of the solar power generation system is equal to or lower than the power threshold value, the maximum power point tracking unit is set to a predetermined constant as the operating voltage command value. Output the value
A control method for a photovoltaic power generation system, wherein when the generated power of the photovoltaic power generation system is equal to or greater than the power threshold value, the operating voltage command value is determined and output by maximum power point tracking control .

In the control method of the solar power generation system according to claim 10,
The power control unit has a voltage setting method by the maximum power point tracking unit and a voltage setting method at the time of power suppression in an operating voltage setting method of the solar cell array at the time of power suppression. A control method for a photovoltaic power generation system, wherein a voltage setting method is determined based on a comparison between a power suppression value and a power measurement value.

In the control method of the solar power generation system according to claim 10,
The power control unit has a voltage setting method by the maximum power point tracking unit and a voltage setting method at the time of power suppression in an operating voltage setting method of the solar cell array at the time of power suppression. The control method of a solar power generation system which selects from the list | wrist of the electric power suppression value which prepared the voltage setting method in advance, and the voltage command value corresponding to the said electric power suppression value.

In the control method of the solar power generation system according to claim 10,
In the control of the photovoltaic power generation system, the power control unit has a plurality of voltage command value setting methods at the time of canceling power suppression, and sets a voltage threshold value for switching the plurality of voltage command value setting methods to the solar power generation system. A method for controlling a photovoltaic power generation system, which is determined from a minimum starting voltage value.