JP2005251039A - Maximum power control method for solar battery and its controller - Google Patents

Maximum power control method for solar battery and its controller Download PDF

Info

Publication number
JP2005251039A
JP2005251039A JP2004063217A JP2004063217A JP2005251039A JP 2005251039 A JP2005251039 A JP 2005251039A JP 2004063217 A JP2004063217 A JP 2004063217A JP 2004063217 A JP2004063217 A JP 2004063217A JP 2005251039 A JP2005251039 A JP 2005251039A
Authority
JP
Japan
Prior art keywords
solar cell
voltage
operating point
maximum power
instantaneous
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP2004063217A
Other languages
Japanese (ja)
Inventor
Hiroki Ishikawa
Haruo Naito
治夫 内藤
裕記 石川
Original Assignee
Japan Science & Technology Agency
独立行政法人科学技術振興機構
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Japan Science & Technology Agency, 独立行政法人科学技術振興機構 filed Critical Japan Science & Technology Agency
Priority to JP2004063217A priority Critical patent/JP2005251039A/en
Publication of JP2005251039A publication Critical patent/JP2005251039A/en
Application status is Pending legal-status Critical

Links

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell maximum power control method and a control device therefor, which have a rapid transient response and a pulsation in the vicinity of the maximum power point which are extremely small and have good convergence.
SOLUTION: A method for controlling the power taken out via a solar cell 2 and a power conversion means 3 connected to the solar cell 2 to a maximum power, in order to specify the change direction of the operating point of the solar cell 2, the power conversion Feedback control is performed using the instantaneous voltage pulsation or instantaneous current pulsation associated with the switching operation of the means 3, and the operation point of the solar cell 2 after reaching the maximum power point and moving the operation point of the solar cell 2 is reached. In the maintenance, an average value of the operating point voltage or current of the solar cell 2 is obtained, and feedback control is performed based on integral control of the average value of the operating point voltage or current of the solar cell 2. A rapid transient response is obtained, the pulsation in the vicinity of the maximum power point is extremely small, and the convergence is good.
[Selection] Figure 1

Description

  The present invention relates to a solar cell maximum power control method and a control apparatus therefor.

There is an urgent need to develop alternative energy utilization technologies such as photovoltaic power generation and to improve the efficiency of fossil fuels that adversely affect the global environment.
In general, the technical development elements of solar power generation can be broadly divided into those related to solar cell materials and those related to solar power generation system technology. In solar cell material development, materials with high conversion efficiency are being developed along with reductions in material costs. On the other hand, in the photovoltaic power generation system technology development, it is indispensable to improve the efficiency of the technology for extracting the maximum power from the solar cell.

FIG. 20 is a diagram illustrating an example of output characteristics of a solar cell. In the figure, the horizontal axis represents the voltage (V) generated in the solar cell, and the vertical axis represents the current (I) of the solar cell and the generated power P (P = I × V).
In the current-voltage characteristics (hereinafter referred to as IV characteristics) of the solar cell, the open voltage of the solar cell is a voltage when the current is 0, and the short-circuit current of the solar cell is 0, that is, short-circuited. When the current.
The apex of the power-voltage characteristics (hereinafter referred to as PV characteristics) of the solar cell is the maximum power point at which the output power from the solar cell is maximized (Maximum Power Point, hereinafter referred to as MPP as appropriate). With no control, there is no guarantee that the operating point of the solar cell is located at the MPP, and it is quite possible that the power of the solar cell stays at an operating point where the PV characteristics are small.
Furthermore, the characteristics illustrated in FIG. 20 are not invariant and change from moment to moment depending on weather conditions such as the amount of sunlight and temperature, and the MPP does not become a fixed point. In order to extract the maximum power from the solar cell, it is necessary to connect the power converter to the solar cell and perform control for causing the moving MPP to follow the operating point of the solar cell. This control is called a maximum power point tracking (MPPT) control method.
A number of MPPT methods have been reported so far. For example, a method by function approximation of characteristics of solar cells (see Non-Patent Documents 1 and 2), a method of matching the internal impedance of solar cells and the input impedance of a converter connected to the solar cells to the maximum power condition (Non-Patent Documents) 3 and 4), binary control system (see Non-Patent Documents 5 and 6), and the like.

One of them is a hill-climbing method (hereinafter also referred to as a P & O method as appropriate), and many methods have been proposed (for example, see Patent Documents 1 and 2).
The basic principle is that the voltage or current of the solar cell is always slightly changed by the power converter, and the generated power of the power converter is increased in the direction in which the generated power is increased by the change of the generated power of the solar cell corresponding to this. This is a control method for moving the center position of the fluctuation range.

Japanese Patent Laid-Open No. 62-85312 (FIGS. 1 and 4) Japanese Patent Application Laid-Open No. 2002-48704 (pages 2 and 3, FIG. 1) A. Kislovski and R. Redl, "Maximum-power-tracking using positive feedback", (1994), Proc IEEE Power Electron Spec. Conf., Pp.1065-1068 Y. Yamaguchi, E. Sato, H. Minakata, S. Tadakuma, "Maximum Power Tracking Control Method of A Solar Cell by Approximating theIV Characteristics", (1998), Convention Record IEE Japan, Industry Applications Society, pp.191 -194 A. Nafeh, F. Fahmy, O. Mahgoub and E. Abou El-Zahab, "Developed algorism of maximum power tracking for stand alone photovoltaic system", (1998), Energy Sources, Vol. 20, Issue 1, pp. 45 -58 K. Hussein, I. Muta, T. Hoshino and M. Osakada "Maximum photo-voltaic power tracking: An algorithm for rapidly changing atmosphere conditions", (Jan., 1995), Proc. Inst. Elect. Eng. G, vol .142, pp.59-64 Takashi Watanabe, Toshiya Yoshida, Katsumi Ohba, "Maximum Power Point Tracking Method Considering Dynamic Characteristics of Solar Cells" (2003), IEEJ Transactions D, Vol.123, No.7, pp.863-869 M. Miyatake, T. Kouno and M. Nakano, "Maximum Power Point Tracking Method of Photovoltaic Generation System Introducing Line Search Method", (2000), Proceedings of Japan Industry Applications Society Conference, pp.327-330

  In the conventional hill-climbing method, there is a problem that vibrations remain in the vicinity of the MPP even in a steady state after the MPPT is achieved, and power loss occurs because the operating point vibration of a certain width is continued regardless of whether the MPPT is achieved.

  SUMMARY OF THE INVENTION In view of the above problems, the present invention aims to provide a novel method for controlling the maximum power of a solar cell and its control device, which has a rapid transient response and pulsation in the vicinity of the maximum power point that is extremely small and has good convergence. And

In order to achieve the above object, the present invention is a method for controlling the power taken out via a solar cell and the power conversion means connected to the solar cell to the maximum power, the instantaneous voltage accompanying the switching operation of the power conversion means. By feedback control using pulsation or instantaneous current pulsation, the change direction of the operating point of the solar cell is specified, and furthermore, the operating point voltage average value or operating point current average value of the solar cell is obtained, and the operating point of the solar cell is obtained. By performing feedback control based on integral control of the voltage average value or the operating point current average value, the operating point of the solar cell is moved to the maximum power point and the operating point of the solar cell after reaching the maximum power point is maintained. It is characterized by that.
In the above configuration, the instantaneous voltage pulsation of the solar cell is preferably calculated from the instantaneous voltage v (t) of the solar cell or power conversion means, or the instantaneous current pulsation of the solar cell is instantaneously calculated by the solar cell or power conversion means. Calculate from the current pulsation i (t).
Moreover, the operating point voltage average value of the solar battery is preferably calculated from the instantaneous voltage v (t) of the solar battery or the power converter, and used as a command value for the duty ratio of the power converter. Furthermore, the operating point current average value of the solar cell may be calculated from the instantaneous current i (t) of the solar cell or the power conversion means, and used as a command value for the duty ratio of the power conversion means.

According to this configuration, feedback control can be performed using the instantaneous voltage variation or the instantaneous current variation of the solar cell and appropriately using the instantaneous value and the average value.
In order to specify the change direction of the operating point of the solar cell, feedback control is performed using instantaneous voltage pulsation or instantaneous current pulsation accompanying the switching operation of the power conversion means in order to control the operating point of the solar cell. A transient response can be provided.
In addition, the movement of the solar cell to the maximum power point and the maintenance of the operating point after the maximum power point is achieved are performed by feedback control of the average value of the operating point voltage or current of the solar cell based on integral control, so that the vicinity of the MPP A control method with extremely small pulsation and good convergence can be provided.
Therefore, after achieving the maximum power point tracking (MPPT) under a certain condition, the change of the operating point voltage or current command value given by the average value can be kept small.

Furthermore, the present invention is a solar cell maximum power control device including a power conversion means and a maximum power control unit connected to the solar cell, wherein the maximum power control unit includes at least an instantaneous maximum power calculation means and a comparison means. And an average voltage or average current calculating means, an amplifying means, and an integrating means, and the instantaneous maximum power calculating means is based on the instantaneous voltage v (t) of the solar cell and the instantaneous current i (t) of the solar cell. The operating point voltage command value V * or the operating point current command value I * of the solar cell is output to the comparing means, and the average voltage or average current calculating means calculates the instantaneous voltage pulsation or instantaneous current pulsation accompanying the switching operation of the power conversion means. The average voltage or average current is output to the comparison means, and the comparison means averages the voltage deviation ΔV between the solar cell operating point voltage command value V * and the average voltage or the solar cell operating point current command value I * and the average. Electric Current deviation ΔI with respect to the current is output, the voltage deviation ΔV or current deviation ΔI is amplified by the amplifying means, and further given by the integrating means as a command value for the duty ratio of the power conversion means, and the voltage deviation ΔV or current deviation ΔI is The feedback control is performed so as to be 0.
In the above configuration, preferably, the instantaneous maximum power calculating means uses power to specify the change direction of the operating point of the solar cell based on the instantaneous voltage v (t) of the solar cell and the instantaneous current i (t) of the solar cell. Using the instantaneous voltage pulsation or instantaneous current pulsation accompanying the switching operation of the conversion means, the operating point voltage command value V * or the operating point current command value I * of the solar cell is output to the comparing means, and the maximum operating point of the solar cell is output. The movement to the power point and the maintenance of the operating point of the solar cell after reaching the maximum power point are obtained by calculating the operating point voltage average value or the operating point current average value of the solar cell, and the operating point voltage command value V * of the solar cell . Alternatively, the operating point current command value I * is output to the comparison means.
It is preferable that the average value of the operating point voltage of the solar cell is calculated from the instantaneous voltage v (t) of the solar cell or the power conversion means and used as a command value for the duty ratio of the power conversion means.
Moreover, the operating point current average value of the solar cell may be calculated from the instantaneous current i (t) of the solar cell or the power conversion means and used as a command value for the duty ratio of the power conversion means.
Moreover, the control device of the solar cell includes a computer, and the computer uses the instantaneous voltage v (t) of the solar cell and the instantaneous current i (t) of the solar cell, the instantaneous power p (t), and the operating point voltage of the solar cell. It is preferable to automatically calculate the command value V * or the operating point current command value I * and the operating point voltage average value or operating point current average value of the solar cell.

  According to this configuration, the change direction of the operating point of the solar cell is determined by feedback control using the instantaneous voltage or current pulsation accompanying the switching operation of the power conversion means in order to control the operating point of the solar cell. Then, the movement of the solar cell to the maximum power point and the maintenance of the operating point after the maximum power point is achieved are performed by feedback control of the average value of the operating point voltage or current of the solar cell based on the integral control, and the transient It is possible to provide a control device for a solar cell that has extremely small response and pulsation in the vicinity of the MPP and that has good convergence. Thereby, since the maximum electric power is always obtained from the solar cell, the electric power of the solar cell can be used effectively.

  According to the present invention, there is provided a method for controlling the maximum power of a solar cell and a control device for the power from the solar cell, in which the rapid transient response and the pulsation near the MPP are extremely small and the maximum power can be tracked with good convergence. Can be provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
First, the apparatus used for the maximum power control method of the solar cell of the present invention will be described. FIG. 1 is a block diagram schematically showing a solar cell maximum power control apparatus of the present invention.
As shown in the figure, the solar cell maximum power control device 1 according to the present invention includes a solar cell 2, power conversion means 3 connected to the solar cell 2, and a maximum power control unit 4.
The maximum electric power control unit 4 controls the electric power taken out via the solar cell 2 and the power conversion means 3 connected to the solar cell so as to be maximum. As such power conversion means 3, a DC-DC chopper (hereinafter simply referred to as a chopper as appropriate) that converts the direct current output of the solar cell 2 into direct current can be used. Hereinafter, the power conversion means 3 will be described as a chopper.

The maximum power control unit 4 includes an instantaneous maximum power calculation unit 5, a comparison unit 6, an average voltage calculation unit 7 that calculates the voltage average value V AVE from the output of the chopper 3, an amplification unit 8, an integration unit 9, It is made up of.
Here, the instantaneous maximum power calculation means 5, the comparison means 6, and the average voltage calculation means 7 may be configured using a computer including a microprocessor, a digital signal processor (DSP), an A / D converter, and the like. it can. The amplification means 8 and integration means 9 can be analog ICs or the like.

The instantaneous maximum power calculation means 5 receives the instantaneous voltage v (t) 2 a and the instantaneous current i (t) 2 b of the solar cell 2, calculates an operating point voltage command value V *, which will be described later, and outputs it to the comparison means 6. To do.

The average voltage calculation means 7 calculates the average voltage V AVE of the output voltage from the output power 3 ′ from the chopper 3 connected to the solar cell 2 and outputs it to the comparison means 6.
Here, when the output voltage of the chopper 3 is 1: 1 with respect to the solar cell 2, the average voltage V AVE can be calculated from the output voltage of the chopper 3 as shown. When the voltage ratio is different, for example, when the voltage of the solar cell is boosted by a chopper, the average voltage V AVE may be calculated from the instantaneous voltage v (t) of the solar cell 2.

The comparison means 6 detects a voltage deviation ΔV (ΔV = V * −V AVE ) between the operating point voltage command value V * and the average voltage V AVE . This voltage deviation ΔV is amplified by the amplifying means 7 and further output to the chopper 3 as a duty signal by the integrating means 8.

Feedback control is performed so that the voltage deviation ΔV obtained by the comparison means 6 becomes zero. That is, the feedback control system is configured so that the operating voltage of the solar cell 2 follows the operating point voltage command value V * .
The operating point voltage command value V * is not a command value for the instantaneous value of the solar cell 2 but a command value for the average value in the chopper voltage control sampling period ΔT.
In this way, feedback control is performed, and when the tracking is achieved and the voltage deviation ΔV becomes 0, the duty ratio to the chopper 3 at that time is maintained. That is, in order to keep the operating voltage of the solar cell 2 at the operating voltage command value V * , the control logic is integral control using the integrating means 8.

Next, the operation of the solar cell maximum power control apparatus 1 of the present invention will be described.
For specifying the direction in which the operating point of the solar cell 2 is brought closer to the MPP, instantaneous voltage fluctuation caused by the switching operation of the chopper 3 connected to the solar cell 2 is used.
When the operating point of the solar cell 2 approaches the MPP, the operating point voltage of the solar cell 2 is made to follow the operating point voltage command value V * . This operating point voltage command value V * is controlled using the average voltage of the chopper voltage control sampling period ΔT in the input stage of the chopper 3.

The solar cell maximum power control apparatus 1 of the present invention is configured as described above, and a specific control method in a direction in which the operating point of the solar cell 2 approaches the MPP will be described in more detail.
FIG. 2 shows (a) the IV and PV characteristics of the solar cell, and (b) the change with time of the output power in the solar cell maximum power control method according to the first embodiment of the present invention. It is a figure which shows a certain P (t) characteristic typically.
In the PV characteristic curve of FIG. 2A, the voltage operating point range (V MIN ≦ V ≦ VMAX ) indicated by the bidirectional arrows is caused by the switching operation of the chopper 3 connected to the solar cell 2. Voltage fluctuation. Due to this voltage variation, the power of the solar cell 2 also varies, and P (t) exhibits pulsation as shown in FIG.

The maximum value of the instantaneous power in the chopper voltage control sampling period ΔT is P IMAX and the corresponding instantaneous voltage is V IMAX . The average voltage of the instantaneous operating point voltage during ΔT is V AVE . In FIG. 2A, the following relations are established when the operating point is lower and higher than the voltage of the MPP.
V IMAX > V AVE (1)
V IMAX <V AVE (2)
As is clear from FIG. 2 (a), V IMAX always exists on the side closer to MPP than V AVE, and therefore, V IMAX is used to specify the direction in which the operating point of solar cell 2 approaches MPP. Feedback control. Thereby, in order to specify the direction in which the operating point of the solar cell 2 approaches the MPP, by using the instantaneous voltage V IMAX of the operating voltage of the solar cell 2, a rapid transient response characteristic can be obtained.

Next, the operation when the voltage of the solar cell is near the maximum power point will be described.
FIG. 3 is a diagram schematically showing an IV characteristic and a PV characteristic of a solar cell near the maximum power point in the solar cell maximum power control method according to the first embodiment of the present invention. As can be seen from the PV characteristic curve of FIG. 3, when the operating point C of the solar cell 2 reaches V IMAX near the MPP, the pulsation of the instantaneous voltage, that is, the change range of the operating point voltage is shown in FIG. Unlike the case of), it extends on both sides of V IMAX . If continue tracking of the V IMAX, V IMAX is located substantially at the center of the range of variation of the operating point voltage of the solar cell 2, MPPT can be achieved. The same applies when the operating point is lower than the MPP voltage.
Here, the control period of the MPPT is an update period of the operating point voltage command value V * that is an output of the instantaneous maximum power control means 5, and may be a period sufficiently longer than the chopper voltage control sampling period ΔT. For example, it can be 1000 times to 10,000 times ΔT.
Therefore, if the feedback control is performed so that the central value V AVE of the operating point voltage of the solar cell 2, that is, the average value V AVE of the operating point voltage follows V IMAX , the operating point of the solar cell 2 is set to MPP. Follow-up control in the direction of approaching.
As a result, for the follow-up control of the operating point of the solar cell 2 to the MPP, by using the average voltage V AVE of the operating voltage of the solar cell 2, rapid transient response and convergence with extremely small pulsation in the vicinity of the MPP. Can be realized. Thus, the solar cell maximum power control method of the present invention can be referred to as Instantaneous Maximum Power Point Tracking (IMPTC).

Next, the process of calculating the instantaneous voltage V IMAX that is the target value for tracking the operating point voltage of the solar cell 2 will be described. FIG. 4 is a flowchart showing a process of calculating V IMAX .
First, in step ST1, the instantaneous voltage v (t) and the instantaneous current i (t) of the solar cell 2 are detected.

  Next, in step ST2, the instantaneous power p (t) is obtained by multiplying the instantaneous voltage v (t) and the instantaneous current i (t).

In step ST3, the magnitude relationship between the obtained instantaneous power p (t) and P MAX is determined. Here, P MAX is the maximum value of instantaneous power calculated so far within the ΔT period. Then, in step ST3, the when obtained instantaneous power p (t) is determined to be smaller than P MAX (p (t) < P MAX) becomes the return flow advances to step ST5.

In contrast, in step ST3, the magnitude relationship P MAX of the resulting instantaneous power p (t) is, when it is determined to be greater than P MAX (p (t)> P MAX) is, before proceeding to a step ST4. In step ST4, this P MAX is the maximum instantaneous power p (t) (P IMAX = p (t)), and the instantaneous voltage v (t) corresponding to this P MAX is specified as V IMAX. Then, the process proceeds to step ST5 and returns. At this time, V IMAX becomes the operating point voltage command value V * to the chopper 3.

Here, the physical quantity that is actually directly given to the chopper 3 as the operating point voltage command value V * is the duty ratio. The chopper 3 executes on / off control of the switching element of the chopper 3 at the switching frequency in order to realize the given duty ratio. When the switching element is turned on to make a short circuit, the output current of the solar cell 2 increases, and the output voltage of the solar cell 2 decreases according to the IV characteristics shown in FIG. Further, the reverse phenomenon occurs when the switching element is turned off.
Thus, the increase / decrease in the voltage of the solar cell 2 is a change in the instantaneous value due to switching, and MPPT can be performed using this pulsation as described in the method for controlling the maximum power of the solar cell.

Next, a method for controlling the maximum power of the solar cell according to the second embodiment of the present invention will be described. FIG. 5 is a block diagram schematically showing a solar cell maximum power control apparatus according to the second embodiment of the present invention. As shown in the figure, the solar cell maximum power control device 1 ′ according to the second embodiment of the present invention is different from the solar cell maximum power control device 1 according to the first embodiment of the present invention shown in FIG. 1. Is to use the instantaneous current i (t) of the solar cell for feedback control.
Therefore, in order to be controlled by the instantaneous current i (t) of the solar cell, the maximum power control unit 4 determines the current average value I from the outputs of the instantaneous maximum power calculation means 5 ′, the comparison means 6 ′, and the chopper 3. It comprises an average voltage calculation means 7 ′ for calculating AVE , an amplification means 8 ′, and an integration means 9 ′.

The instantaneous maximum power calculating means 5 receives the instantaneous voltage v (t) 2a and the instantaneous current i (t) 2b of the solar cell 2, calculates the operating point current command value I * , and outputs it to the comparing means 6 ′. .

The average current calculation means 7 ′ calculates the average current I AVE of the output current from the output power 3 ′ from the chopper 3 connected to the solar cell 2 and outputs it to the comparison means 6 ′.
Here, when the output current of the chopper 3 is 1: 1 with respect to the solar cell 2, the average current I AVE can be calculated from the output current of the chopper 3 as shown. When the current ratio is different, for example, when the voltage of the solar cell is boosted by the chopper 3, the current changes, so the average current I AVE is calculated from the instantaneous current i (t) of the solar cell 2. May be.

The comparison means 6 ′ detects a current deviation ΔI (ΔI = I * −I AVE ) between the operating point current command value I * and the average voltage I AVE . This current deviation ΔI is amplified by the amplifying means 7 ′ and further output to the chopper 3 as a duty signal by the integrating means 8 ′.

Feedback control is performed so that the current deviation ΔI obtained by the comparison means 6 ′ becomes zero. That is, the feedback control system is configured so that the operating current of the solar cell 2 follows the operating point current command value I * . At this time, the operating point current command value I * is not a command value for the instantaneous value of the solar cell 2 but a command value for the average value at ΔT.
Thus, feedback control is performed, and when the follow-up is achieved and the current deviation ΔI becomes 0, the duty ratio to the chopper 3 at that time is maintained. That is, in order to keep the operating current of the solar cell 2 at the operating current command value I * , the control logic is integral control using the integrating means 8 ′.

  Since the solar cell maximum power control apparatus 1 'according to the second embodiment of the present invention is configured as described above, the instantaneous voltage fluctuation v (t of the solar cell maximum power control method according to the first embodiment is described. ) Is replaced with the instantaneous current fluctuation i (t), the operation point of the solar cell 2 is controlled to be the maximum power (see FIGS. 2 and 3).

In addition, in the process of calculating the instantaneous voltage I IMAX that is the target value for tracking the operating point current of the solar cell 2, the instantaneous current i (t) corresponding to P MAX may be specified as I IMAX in step ST4 of FIG. . The MPPT control cycle is an update cycle of the operating point current command value I *, which is the output of the instantaneous maximum power control means 5, and may be a cycle sufficiently longer than the chopper voltage control sampling cycle ΔT. For example, it can be 1000 times to 10,000 times ΔT.

Here, the physical quantity that is actually directly given to the chopper 3 as the command value from the operating point current command value I * is the duty ratio. The chopper 3 executes on / off control of the switching element of the chopper 3 at the switching frequency in order to realize the given duty ratio.
Therefore, when the switching element is turned on to make it short-circuited, the output current of the solar cell 2 increases, and the output voltage of the solar cell 2 decreases according to the IV characteristics shown in FIG. Further, the reverse phenomenon occurs when the switching element is turned off. Thus, the increase / decrease in the current of the solar cell 2 is a change in the instantaneous current value due to switching, and the MPPT can be performed using this current pulsation in the same manner as the instantaneous voltage value.

The characteristics of the solar cell maximum power control method of the present invention described above will be described.
In order to specify the change direction of the operating point of the solar cell 2, the pulsation of the instantaneous voltage or the instantaneous current accompanying the switching operation of the chopper 3 as the power conversion means necessary for controlling the operating point of the solar cell 2 is used. The movement of the operating point of the solar cell 2 to the MPP and the maintenance of the operating point after the achievement of MPPT are performed by feedback control of the operating point voltage average value or the operating point voltage average value of the solar cell 2 based on integral control. is there.
Therefore, the essential difference between the solar cell maximum power control method of the present invention and the conventional so-called hill-climbing method is that the instantaneous value and average value of the voltage v (t) or current i (t) of the solar cell 2 are appropriately set. It is in different use. Thereby, in the maximum power control method of the solar cell of the present invention, after MPPT is achieved under a certain condition, the change of the operating point voltage command value V * or the operating point current command value I * given as an average value is made small. It becomes possible to stop.
At the same time, the MPP movement information, which is indispensable for the movement of the MPP due to subsequent changes in conditions such as sunshine, shows the pulsation of the operating point voltage or operating point current of the solar cell 2 that is constantly generated by the switching operation of the chopper 3. You can use it without delay.

Example 1 of the solar cell maximum power control apparatus of the present invention will be described.
FIG. 6 is a block diagram schematically illustrating the solar cell maximum power control apparatus according to the first embodiment of the present invention. As shown in FIG. 6, the solar cell maximum power control apparatus 10 of Example 1 is constituted by a solar cell 2, a chopper 3 (a region surrounded by a dotted line in FIG. 6), and a maximum power control unit 4 ′. Has been.

  The chopper 3 includes a switching element 11, a diode 12, capacitors 13 and 14, an inductance 15, and the like. The output stage of the chopper 3 is directly connected to the load 16 or connected to a load or an AC system via an inverter (not shown). In Example 1, in order to evaluate only the performance of MPPT, a battery 16 ′ was connected as a load of the chopper 3.

The maximum power control unit 4 ′ includes the maximum power control unit 4 described with reference to FIG. 1 and the switching element controller 13 of the chopper 3. The maximum power control unit 4 ′ was manufactured using a DSP. Moreover, the program regarding the solar cell maximum power control method of this invention was written in the memory of the digital signal processor (DSP).
The instantaneous voltage 2a and instantaneous current 2b of the solar cell are detected by an isolation amplifier 17 and a Hall current detector (Hall CT) 18, respectively, and input to the maximum power control unit 4 ′. For the instantaneous voltage 2a of the solar cell, its instantaneous value and average value are calculated and used for control, and the instantaneous current 2b of the solar cell is used for calculation of instantaneous power.

  FIG. 7 is a table showing the control conditions of the used solar cell 2 and maximum power control unit 4 ′. As the solar cell 2, GT-1633-TF (Showa Shell product) is used, its rated maximum power is 2.8W, and the rated output voltage is 15.4V. The control conditions of the maximum power control unit 4 ′ are that the switching frequency is 10 kHz, the sampling period of the instantaneous maximum power calculation means 5 is 10 μs, the MPPT period is 50 ms, and the rated output voltage is 24V. As a light source for irradiating the solar cell 2, a halogen lamp capable of adjusting the amount of light was used.

(Comparative Example 1)
Next, Comparative Example 1 will be described.
For comparison with Example 1, a maximum power control device for a solar cell using a conventional hill-climbing method was manufactured. The control device of Comparative Example 1 is the same as the solar cell maximum power control device of Example 1 of the present invention shown in FIG. 5, except that the solar cell and the chopper are the same, and the control method is changed to the hill-climbing method. .

The conventional hill-climbing method used in Comparative Example 1 will be described.
The operating voltage of the solar cell is changed with a constant change width every ΔT. The output power of the solar cell before and after the change is compared, and the operating point of the solar cell is moved in the direction in which the power always increases to approach the MPP. The operating voltage before the change in the solar cell is V A , the electric power at that time is P A , the operating voltage after the change is V B , the electric power at that time is P B , and the fluctuation range of the voltage is ΔV. The operating point was changed under the judgment conditions of Equations (6) to (6).
When (P A > P B ) ∩ (V A > V B ), ΔV> 0 (3)
When (P A <P B ) ∩ (V A <V B ), ΔV> 0 (4)
When (P A > P B ) ∩ (V A <V B ), ΔV <0 (5)
When (P A <P B ) ∩ (V A > V B ), ΔV <0 (6)
Here, ∩ is a logical product (AND).

In Example 1 and Comparative Example 1, the control result of the solar cell under the condition that the illuminance and temperature to the solar cell are kept constant will be described. Here, a state in which the illuminance and temperature to the solar cell are kept constant is called a steady state. Since most of the operation time of the solar cell is from the sunrise to the sunset, the steady state occupies the increase of the power in the steady state, which is most important and important. Under this condition, the PV characteristics of the solar cell are determined by a single curve, which is suitable for evaluating the basic performance of MPPT control.
FIG. 8 is a diagram showing the power response of the maximum power control device for solar cells of Example 1 and Comparative Example 1. In the figure, the vertical axis represents the power (W) of the solar cell, and the horizontal axis represents the control time (s). In the first embodiment, an operating point deviating from the MPP in a state where MPPT control is not performed is set as an initial operating point. From this point, MPPT control is started and the power response is observed. The initial operating point was set to 65% of the MPP power in a state lower than the MPP voltage, and the power response speed was set to the fastest.
On the other hand, in the hill-climbing method of Comparative Example 1, the change width ΔV of the operating point voltage was set to be substantially the same as the response of Example 1.
As is clear from FIG. 8, from the comparison of the waveforms after reaching the steady state, it can be seen that there is almost no pulsation in Example 1, but significant pulsation has occurred in the comparative example (FIG. 8). A section).

FIG. 9 is a table comparing the amount of electric power in one cycle of the pulsation of FIG. As is clear from FIG. 9, the amount of power in section A in FIG. 8 was 171.8 mW in Example 1 and 164.8 mW in the comparative example. From this, in Example 1, 4.2% more electric power than the comparative example was obtained.
This is because, in the hill-climbing method of the comparative example, the operating point command voltage needs to continue to fluctuate in principle after reaching the MPP, whereas the IMPTC of the first embodiment makes the operating point command voltage constant by integral control. This is because large electric power can be obtained.

Next, another power response of Example 1 and Comparative Example 1 will be described.
FIG. 10 shows a comparison of power responses when the steady state pulsations of Example 1 and Comparative Example 1 are changed to be substantially the same as those of Example 1.
In the figure, the vertical axis represents the power (W) of the solar cell, and the horizontal axis represents the control time (s). Specifically, in the hill-climbing method of the comparative example, the operating point voltage change width was narrowed to 1/6 of the case shown in FIG.
As is clear from FIG. 10, the transient response speed of Example 1 is about 0.1 s, and it can be seen that the transient response speed of Comparative Example 1 is greatly degraded to 0.7 s. From this, it can be seen that, in Comparative Example 1, the pulsation in the steady state can be reduced as intended by the above setting change, but the transient response speed is greatly deteriorated.

FIG. 11 is a table showing a comparison of electric energy in section B, which is the transient response period in FIG. As is clear from FIG. 11, the powers of Example 1 and Comparative Example 1 were 1218 mW and 1011 mW, respectively. From this, it can be seen that the power in the transient response period of Example 1 is about 20% higher than that of the comparative example.
As a result, it was found that, in the IMPTC method, which is Example 1 of the present invention, the power response speed and steady state characteristics of the solar cell in MPPT control are larger than those of Comparative Example 1 and have superior controllability.
On the other hand, in the hill-climbing method of the comparative example, when the power response of MPPT control is increased, the pulsation after reaching the MPP, that is, in a steady state is large, and the power loss is large. On the other hand, if steady characteristics were emphasized, the response speed slowed down and power loss occurred.

The solar cell maximum power control apparatus will be described with reference to Example 2 in which the same apparatus as in Example 1 was used, and the solar cell irradiation conditions were changed.
In Comparative Example 2, the setting of the response speed of the hill-climbing method in Comparative Example 1 is set with emphasis on steady characteristics, that is, the setting shown in FIG.
Maintaining the temperature of the solar cell 2 to be constant, already illumination of a halogen lamp for illuminating from the state subjected to MPPT control in the solar cell 2 is such that the 0.5kW / m 2 ~1.0kW / m 2 , the halogen lamp The power supply voltage was raised stepwise and lowered.

First, the power response when the illuminance to the solar cell is increased will be described.
FIG. 12 is a diagram illustrating the power response of the maximum power control device for solar cells when the illuminance of Example 2 and Comparative Example 2 is increased. In the figure, the vertical axis represents the power (W) of the solar cell, and the horizontal axis represents the control time (s). As is clear from FIG. 12, the transient response time of Example 2 reaches MPP after the illuminance increase 0.15s faster than that of Comparative Example 2, so that the control speed of Example 2 is fast. I understand.

  FIG. 13 is a table showing a comparison of electric energy in section D, which is the transient response period of FIG. As is clear from FIG. 13, the power of Example 2 was 875 mW and the power of Comparative Example 2 was 764 mW in the D section that was the transient response period. From this, it can be seen that in Example 2, the power in the transient response period D is 14.6% higher than that in Comparative Example 2.

FIG. 14 and FIG. 15 are diagrams showing the locus of the operating point on the PV characteristics of the solar cell at the time of power response in Comparative Example 2 and Example 2, respectively. In the figure, the vertical axis represents the power (W) of the solar cell, and the horizontal axis represents the voltage (V) of the solar cell.
As is clear from FIG. 14, Comparative Example 2 shows the behavior of moving away from the MPP while the illuminance is increasing. This is a phenomenon that occurs because the hill-climbing method handles only the average value for each ΔT. That is, even if the operating point is moved away from the MPP, the average power increases on the contrary due to the influence of the illuminance increase, and the operating point is moved further away. On the other hand, as is clear from FIG. 15, it can be seen that in Example 2, the behavior of moving away from the MPP as in Comparative Example 2 is not observed. This is because in the second embodiment, this phenomenon does not occur because the instantaneous maximum power point is always monitored.

Next, the power response when the illuminance to the solar cell is lowered will be described.
FIG. 16 is a diagram showing power response waveforms of the maximum power control device of the IMPTC of Example 2 and the hill-climbing method of Comparative Example 2 when the illuminance is lowered. In the figure, the vertical axis represents the power (W) of the solar cell, and the horizontal axis represents the control time (s).
As is apparent from FIG. 16, the power response of Example 2 reaches MPP after illuminance lowering faster than that of Comparative Example 2, and thus it can be seen that the control speed of Example 2 is high.

  FIG. 17 is a table showing a comparison of electric energy in the E section which is the transient response period of FIG. As is clear from FIG. 17, the power of Example 2 was 488 mW and Comparative Example 2 was 525 mW in the E section (see FIG. 16), which is a transient response period. From this, it can be seen that in Example 2, the power in the transient response period E is 7.65% higher than that in Comparative Example 2.

FIGS. 18 and 19 are diagrams showing the locus of the operating point on the PV characteristics of the solar cell when the illuminance to the solar cell in Comparative Example 2 and Example 2 is lowered, respectively. In each figure, the vertical axis represents the power (W) of the solar cell, and the horizontal axis represents the voltage (V) of the solar cell.
From this, it can be seen that in the IMPTC method of Example 2, the responsiveness to the illuminance change is much higher than that of Comparative Example 2.

  The present invention is not limited to the above-described embodiments, and various modifications are possible within the scope of the invention described in the claims. For example, the capacity of the solar cell can be arbitrarily set, and the chopper It goes without saying that the power handling and the control method can be changed and designed as appropriate, and these are also included in the scope of the present invention.

It is a block diagram which shows typically the maximum electric power control apparatus of the solar cell of this invention. In the solar cell maximum power control method of this invention, (a) IV characteristic and PV characteristic of a solar cell, and (b) P (t) characteristic which is the time change of the output electric power are shown typically. FIG. It is a figure which shows typically the IV characteristic and PV characteristic of the solar cell of the maximum power point vicinity in the maximum power control method of the solar cell of this invention. It is a flowchart which shows the process of calculating V IMAX . It is a block diagram which shows typically the maximum electric power control apparatus of the solar cell which concerns on the 2nd Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a block diagram which shows typically the maximum electric power control apparatus of the solar cell of Example 1 of this invention. It is a table | surface which shows the control conditions of the solar cell and the maximum power control part which were used in Example 1. It is a figure which shows the electric power response of the maximum electric power control apparatus of the solar cell of Example 1 and Comparative Example 1. FIG. It is the table | surface which compared the electric energy in one period of the pulsation of FIG. It is a figure which shows the comparison of an electric power response with the case where it changes so that Example 1 and the pulsation in the steady state of the comparative example 1 may become substantially the same as Example 1. It is a table | surface which shows the comparison of the electric energy in B area which is a transient response period of FIG. It is a figure which shows the electric power response of the maximum electric power control apparatus of a solar cell when the illumination intensity of Example 2 and Comparative Example 2 is raised. It is a table | surface which shows the comparison of the electric energy in D area which is a transient response period of FIG. It is a figure which shows the locus | trajectory of the operating point on the PV characteristic of the solar cell at the time of the electric power response in the comparative example 2. It is a figure which shows the locus | trajectory of the operating point on the PV characteristic of the solar cell at the time of the electric power response in Example 2. FIG. It is a figure which shows the electric power response waveform of the maximum electric power control apparatus of the solar cell of Example 2 and the comparative example 2 at the time of falling illumination intensity. It is a table | surface which shows the comparison of the electric energy in E area which is a transient response period of FIG. It is a figure which shows the locus | trajectory of the operating point on the PV characteristic of a solar cell when the illumination intensity to the solar cell in the comparative example 2 is lowered | hung. It is a figure which shows the locus | trajectory of the operating point on the PV characteristic of a solar cell when the illumination intensity to the solar cell in Example 2 is lowered | hung. It is a figure which shows an example of the output characteristic of a solar cell.

Explanation of symbols

1, 1 ', 10: Solar cell maximum power control device 2: Solar cell 2a: Instantaneous voltage v (t) of solar cell
2b: Instantaneous current i (t) of solar cell
3: Power conversion means 3 ': Output of power conversion means 4, 4': Maximum power control units 5, 5 ': Instantaneous maximum power calculation means 6, 6': Comparison means 7, 7 ': Average voltage calculation means 8, 8 ': Amplifying means 9, 9': Integration means 11: Switching element 12: Diodes 13, 14: Capacitor 15: Inductance 16: Load 16 ': Battery 17: Isolation amplifier 18: Hall current detector 20: Switching element controller

Claims (10)

  1. A method for controlling power taken out via a solar cell and power conversion means connected to the solar cell to maximum power,
    For specifying the change direction of the operating point of the solar cell, feedback control is performed using an instantaneous voltage pulsation or an instantaneous current pulsation associated with the switching operation of the power conversion means,
    The movement of the operating point of the solar cell to the maximum power point and the maintenance of the operating point of the solar cell after reaching the maximum power point are obtained by calculating the operating point voltage average value or the operating point current average value of the solar cell, A method for controlling the maximum power of a solar cell, wherein feedback control is performed based on integral control of an operating point voltage average value or an operating point current average value of the solar cell.
  2.   The instantaneous voltage pulsation of the solar cell is calculated from the instantaneous voltage v (t) of the solar cell or the power converter, or the instantaneous current pulsation of the solar cell is calculated as the instantaneous current of the solar cell or the power converter. The method for controlling the maximum power of a solar cell according to claim 1, wherein calculation is performed from pulsation i (t).
  3.   The operating point voltage average value of the solar cell is calculated from an instantaneous voltage v (t) of the solar cell or the power conversion means, and is used as a command value for a duty ratio of the power conversion means. 2. The method for controlling the maximum power of a solar cell according to 1.
  4.   The operating point current average value of the solar cell is calculated from an instantaneous current i (t) of the solar cell or the power conversion unit, and is used as a command value for a duty ratio of the power conversion unit. 2. The method for controlling the maximum power of a solar cell according to 1.
  5. A solar cell maximum power control device having power conversion means and a maximum power control unit connected to the solar cell,
    The maximum power control unit includes at least an instantaneous maximum power calculation unit, a comparison unit, an average voltage or average current calculation unit, an amplification unit, and an integration unit.
    The instantaneous maximum power calculating means is configured to calculate the operating point voltage command value V * or the operating point current command value I * of the solar cell based on the instantaneous voltage v (t) of the solar cell and the instantaneous current i (t) of the solar cell . Is output to the comparison means,
    The average voltage or average current calculation means outputs the average voltage or average current to the comparison means using the instantaneous voltage pulsation or instantaneous current pulsation accompanying the switching operation of the power conversion means,
    The comparison means outputs a voltage deviation ΔV between the operating point voltage command value V * of the solar cell and the average voltage or a current deviation ΔI between the operating point current command value I * of the solar cell and the average current,
    This voltage deviation ΔV or current deviation ΔI is amplified by the amplifying means, and further supplied to the power conversion means by the integrating means as a command value for the duty ratio of the power conversion means, so that the voltage deviation ΔV or current deviation ΔI becomes zero. The maximum power control device for a solar cell, which is feedback-controlled as described above.
  6. When the instantaneous maximum power calculation means specifies the change direction of the operating point of the solar cell, the solar cell or the instantaneous voltage pulsation of the power conversion means accompanying the switching operation of the power conversion means is the operation of the solar cell. The point voltage command value V * is output to the comparison means,
    When the instantaneous maximum power calculation means maintains the operating point of the solar cell after moving to the maximum power point and reaching the maximum power point, the operating point voltage average value of the solar cell is calculated. 6. The solar cell maximum power control device according to claim 5, wherein the solar cell operating power voltage command value V * is output to the comparison means.
  7. The instantaneous maximum power calculation means, when specifying the change direction of the operating point of the solar battery, the instantaneous current pulsation of the solar battery or the power conversion means accompanying the switching operation of the power conversion means. The point current command value I * is output to the comparison means,
    The instantaneous maximum power calculation means, when maintaining the operating point of the solar cell after moving the operating point of the solar cell to the maximum power point and reaching the maximum power point, the operating point current average value of the solar cell 6. The solar cell maximum power control apparatus according to claim 5, wherein the operation point current command value I * of the solar cell is output to the comparison means.
  8.   The operating point voltage average value of the solar cell is calculated from an instantaneous voltage v (t) of the solar cell or the power conversion means, and is used as a command value for a duty ratio of the power conversion means. The maximum power control device for a solar cell according to 5 or 6.
  9.   The operating point current average value of the solar cell is calculated from an instantaneous current i (t) of the solar cell or the power conversion unit, and is used as a command value for a duty ratio of the power conversion unit. The maximum power control device for a solar cell according to 5 or 6.
  10. The solar cell control device comprises a computer,
    The computer calculates the instantaneous power p (t) and the operating point voltage command value V * or operating point current of the solar cell from the instantaneous voltage v (t) of the solar cell and the instantaneous current i (t) of the solar cell. 9. The solar cell control according to claim 5, wherein the command value I * and the operating point voltage average value or the operating point current average value of the solar cell are automatically calculated. apparatus.
JP2004063217A 2004-03-05 2004-03-05 Maximum power control method for solar battery and its controller Pending JP2005251039A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2004063217A JP2005251039A (en) 2004-03-05 2004-03-05 Maximum power control method for solar battery and its controller

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2004063217A JP2005251039A (en) 2004-03-05 2004-03-05 Maximum power control method for solar battery and its controller

Publications (1)

Publication Number Publication Date
JP2005251039A true JP2005251039A (en) 2005-09-15

Family

ID=35031439

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2004063217A Pending JP2005251039A (en) 2004-03-05 2004-03-05 Maximum power control method for solar battery and its controller

Country Status (1)

Country Link
JP (1) JP2005251039A (en)

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007317072A (en) * 2006-05-29 2007-12-06 Mitsubishi Electric Corp Photovoltaic power generation system
KR100908156B1 (en) * 2007-04-13 2009-07-16 경남대학교 산학협력단 Solar maximum power tracking device and method
WO2011119587A2 (en) * 2010-03-22 2011-09-29 Tigo Energy, Inc. Systems and methods for detecting and correcting a suboptimal operation of one or more inverters in a multi-inverter system
WO2012032274A1 (en) * 2010-09-10 2012-03-15 Nexcis Photovoltaic panel operation control
JP2012113639A (en) * 2010-11-26 2012-06-14 Japan Radio Co Ltd Maximum power point follow-up method for solar battery
KR101222090B1 (en) 2010-11-04 2013-01-15 경상대학교산학협력단 Maximum Power Point Tracking Power Conversion and Charging System
US9112379B2 (en) 2006-12-06 2015-08-18 Solaredge Technologies Ltd. Pairing of components in a direct current distributed power generation system
US9130401B2 (en) 2006-12-06 2015-09-08 Solaredge Technologies Ltd. Distributed power harvesting systems using DC power sources
US9235228B2 (en) 2012-03-05 2016-01-12 Solaredge Technologies Ltd. Direct current link circuit
US9291696B2 (en) 2007-12-05 2016-03-22 Solaredge Technologies Ltd. Photovoltaic system power tracking method
US9312399B2 (en) 2010-04-02 2016-04-12 Tigo Energy, Inc. Systems and methods for mapping the connectivity topology of local management units in photovoltaic arrays
US9318974B2 (en) 2014-03-26 2016-04-19 Solaredge Technologies Ltd. Multi-level inverter with flying capacitor topology
US9362743B2 (en) 2008-05-05 2016-06-07 Solaredge Technologies Ltd. Direct current power combiner
US9368964B2 (en) 2006-12-06 2016-06-14 Solaredge Technologies Ltd. Distributed power system using direct current power sources
US9401599B2 (en) 2010-12-09 2016-07-26 Solaredge Technologies Ltd. Disconnection of a string carrying direct current power
US9407161B2 (en) 2007-12-05 2016-08-02 Solaredge Technologies Ltd. Parallel connected inverters
US9537445B2 (en) 2008-12-04 2017-01-03 Solaredge Technologies Ltd. Testing of a photovoltaic panel
US9543889B2 (en) 2006-12-06 2017-01-10 Solaredge Technologies Ltd. Distributed power harvesting systems using DC power sources
US9548619B2 (en) 2013-03-14 2017-01-17 Solaredge Technologies Ltd. Method and apparatus for storing and depleting energy
CN106371496A (en) * 2016-10-26 2017-02-01 西安电子科技大学 Ultra-low voltage comparator circuit for maximum power point tracking (MPPT) circuit and MPPT circuit
US9590526B2 (en) 2006-12-06 2017-03-07 Solaredge Technologies Ltd. Safety mechanisms, wake up and shutdown methods in distributed power installations
US9644993B2 (en) 2006-12-06 2017-05-09 Solaredge Technologies Ltd. Monitoring of distributed power harvesting systems using DC power sources
US9647442B2 (en) 2010-11-09 2017-05-09 Solaredge Technologies Ltd. Arc detection and prevention in a power generation system
US9673711B2 (en) 2007-08-06 2017-06-06 Solaredge Technologies Ltd. Digital average input current control in power converter
US9680304B2 (en) 2006-12-06 2017-06-13 Solaredge Technologies Ltd. Method for distributed power harvesting using DC power sources
US9812984B2 (en) 2012-01-30 2017-11-07 Solaredge Technologies Ltd. Maximizing power in a photovoltaic distributed power system
US9819178B2 (en) 2013-03-15 2017-11-14 Solaredge Technologies Ltd. Bypass mechanism
US9831824B2 (en) 2007-12-05 2017-11-28 SolareEdge Technologies Ltd. Current sensing on a MOSFET
US9853565B2 (en) 2012-01-30 2017-12-26 Solaredge Technologies Ltd. Maximized power in a photovoltaic distributed power system
US9853538B2 (en) 2007-12-04 2017-12-26 Solaredge Technologies Ltd. Distributed power harvesting systems using DC power sources
US9866098B2 (en) 2011-01-12 2018-01-09 Solaredge Technologies Ltd. Serially connected inverters
US9869701B2 (en) 2009-05-26 2018-01-16 Solaredge Technologies Ltd. Theft detection and prevention in a power generation system
US9876430B2 (en) 2008-03-24 2018-01-23 Solaredge Technologies Ltd. Zero voltage switching
US9923516B2 (en) 2012-01-30 2018-03-20 Solaredge Technologies Ltd. Photovoltaic panel circuitry
US9941813B2 (en) 2013-03-14 2018-04-10 Solaredge Technologies Ltd. High frequency multi-level inverter
US9960667B2 (en) 2006-12-06 2018-05-01 Solaredge Technologies Ltd. System and method for protection during inverter shutdown in distributed power installations
US9966766B2 (en) 2006-12-06 2018-05-08 Solaredge Technologies Ltd. Battery power delivery module
US10115841B2 (en) 2012-06-04 2018-10-30 Solaredge Technologies Ltd. Integrated photovoltaic panel circuitry
US10230310B2 (en) 2016-04-05 2019-03-12 Solaredge Technologies Ltd Safety switch for photovoltaic systems
US10396662B2 (en) 2011-09-12 2019-08-27 Solaredge Technologies Ltd Direct current link circuit

Cited By (59)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007317072A (en) * 2006-05-29 2007-12-06 Mitsubishi Electric Corp Photovoltaic power generation system
US9680304B2 (en) 2006-12-06 2017-06-13 Solaredge Technologies Ltd. Method for distributed power harvesting using DC power sources
US9960731B2 (en) 2006-12-06 2018-05-01 Solaredge Technologies Ltd. Pairing of components in a direct current distributed power generation system
US9960667B2 (en) 2006-12-06 2018-05-01 Solaredge Technologies Ltd. System and method for protection during inverter shutdown in distributed power installations
US9966766B2 (en) 2006-12-06 2018-05-08 Solaredge Technologies Ltd. Battery power delivery module
US9853490B2 (en) 2006-12-06 2017-12-26 Solaredge Technologies Ltd. Distributed power system using direct current power sources
US9543889B2 (en) 2006-12-06 2017-01-10 Solaredge Technologies Ltd. Distributed power harvesting systems using DC power sources
US9590526B2 (en) 2006-12-06 2017-03-07 Solaredge Technologies Ltd. Safety mechanisms, wake up and shutdown methods in distributed power installations
US9948233B2 (en) 2006-12-06 2018-04-17 Solaredge Technologies Ltd. Distributed power harvesting systems using DC power sources
US9112379B2 (en) 2006-12-06 2015-08-18 Solaredge Technologies Ltd. Pairing of components in a direct current distributed power generation system
US9130401B2 (en) 2006-12-06 2015-09-08 Solaredge Technologies Ltd. Distributed power harvesting systems using DC power sources
US10097007B2 (en) 2006-12-06 2018-10-09 Solaredge Technologies Ltd. Method for distributed power harvesting using DC power sources
US9644993B2 (en) 2006-12-06 2017-05-09 Solaredge Technologies Ltd. Monitoring of distributed power harvesting systems using DC power sources
US9368964B2 (en) 2006-12-06 2016-06-14 Solaredge Technologies Ltd. Distributed power system using direct current power sources
US10447150B2 (en) 2006-12-06 2019-10-15 Solaredge Technologies Ltd. Distributed power harvesting systems using DC power sources
US10230245B2 (en) 2006-12-06 2019-03-12 Solaredge Technologies Ltd Battery power delivery module
KR100908156B1 (en) * 2007-04-13 2009-07-16 경남대학교 산학협력단 Solar maximum power tracking device and method
US10516336B2 (en) 2007-08-06 2019-12-24 Solaredge Technologies Ltd. Digital average input current control in power converter
US10116217B2 (en) 2007-08-06 2018-10-30 Solaredge Technologies Ltd. Digital average input current control in power converter
US9673711B2 (en) 2007-08-06 2017-06-06 Solaredge Technologies Ltd. Digital average input current control in power converter
US9853538B2 (en) 2007-12-04 2017-12-26 Solaredge Technologies Ltd. Distributed power harvesting systems using DC power sources
US9407161B2 (en) 2007-12-05 2016-08-02 Solaredge Technologies Ltd. Parallel connected inverters
US9831824B2 (en) 2007-12-05 2017-11-28 SolareEdge Technologies Ltd. Current sensing on a MOSFET
US9979280B2 (en) 2007-12-05 2018-05-22 Solaredge Technologies Ltd. Parallel connected inverters
US9291696B2 (en) 2007-12-05 2016-03-22 Solaredge Technologies Ltd. Photovoltaic system power tracking method
US9876430B2 (en) 2008-03-24 2018-01-23 Solaredge Technologies Ltd. Zero voltage switching
US10468878B2 (en) 2008-05-05 2019-11-05 Solaredge Technologies Ltd. Direct current power combiner
US9362743B2 (en) 2008-05-05 2016-06-07 Solaredge Technologies Ltd. Direct current power combiner
US10461687B2 (en) 2008-12-04 2019-10-29 Solaredge Technologies Ltd. Testing of a photovoltaic panel
US9537445B2 (en) 2008-12-04 2017-01-03 Solaredge Technologies Ltd. Testing of a photovoltaic panel
US9869701B2 (en) 2009-05-26 2018-01-16 Solaredge Technologies Ltd. Theft detection and prevention in a power generation system
WO2011119587A3 (en) * 2010-03-22 2011-12-29 Tigo Energy, Inc. Systems and methods for detecting and correcting a suboptimal operation of one or more inverters in a multi-inverter system
WO2011119587A2 (en) * 2010-03-22 2011-09-29 Tigo Energy, Inc. Systems and methods for detecting and correcting a suboptimal operation of one or more inverters in a multi-inverter system
US8922061B2 (en) 2010-03-22 2014-12-30 Tigo Energy, Inc. Systems and methods for detecting and correcting a suboptimal operation of one or more inverters in a multi-inverter system
US10355637B2 (en) 2010-04-02 2019-07-16 Tigo Energy, Inc. Systems and methods for mapping the connectivity topology of local management units in photovoltaic arrays
US9312399B2 (en) 2010-04-02 2016-04-12 Tigo Energy, Inc. Systems and methods for mapping the connectivity topology of local management units in photovoltaic arrays
FR2964759A1 (en) * 2010-09-10 2012-03-16 Nexcis Control of the operation of a photovoltaic panel.
WO2012032274A1 (en) * 2010-09-10 2012-03-15 Nexcis Photovoltaic panel operation control
KR101222090B1 (en) 2010-11-04 2013-01-15 경상대학교산학협력단 Maximum Power Point Tracking Power Conversion and Charging System
US9647442B2 (en) 2010-11-09 2017-05-09 Solaredge Technologies Ltd. Arc detection and prevention in a power generation system
JP2012113639A (en) * 2010-11-26 2012-06-14 Japan Radio Co Ltd Maximum power point follow-up method for solar battery
US9401599B2 (en) 2010-12-09 2016-07-26 Solaredge Technologies Ltd. Disconnection of a string carrying direct current power
US9935458B2 (en) 2010-12-09 2018-04-03 Solaredge Technologies Ltd. Disconnection of a string carrying direct current power
US9866098B2 (en) 2011-01-12 2018-01-09 Solaredge Technologies Ltd. Serially connected inverters
US10396662B2 (en) 2011-09-12 2019-08-27 Solaredge Technologies Ltd Direct current link circuit
US9853565B2 (en) 2012-01-30 2017-12-26 Solaredge Technologies Ltd. Maximized power in a photovoltaic distributed power system
US10381977B2 (en) 2012-01-30 2019-08-13 Solaredge Technologies Ltd Photovoltaic panel circuitry
US9923516B2 (en) 2012-01-30 2018-03-20 Solaredge Technologies Ltd. Photovoltaic panel circuitry
US9812984B2 (en) 2012-01-30 2017-11-07 Solaredge Technologies Ltd. Maximizing power in a photovoltaic distributed power system
US9639106B2 (en) 2012-03-05 2017-05-02 Solaredge Technologies Ltd. Direct current link circuit
US10007288B2 (en) 2012-03-05 2018-06-26 Solaredge Technologies Ltd. Direct current link circuit
US9235228B2 (en) 2012-03-05 2016-01-12 Solaredge Technologies Ltd. Direct current link circuit
US10115841B2 (en) 2012-06-04 2018-10-30 Solaredge Technologies Ltd. Integrated photovoltaic panel circuitry
US9548619B2 (en) 2013-03-14 2017-01-17 Solaredge Technologies Ltd. Method and apparatus for storing and depleting energy
US9941813B2 (en) 2013-03-14 2018-04-10 Solaredge Technologies Ltd. High frequency multi-level inverter
US9819178B2 (en) 2013-03-15 2017-11-14 Solaredge Technologies Ltd. Bypass mechanism
US9318974B2 (en) 2014-03-26 2016-04-19 Solaredge Technologies Ltd. Multi-level inverter with flying capacitor topology
US10230310B2 (en) 2016-04-05 2019-03-12 Solaredge Technologies Ltd Safety switch for photovoltaic systems
CN106371496A (en) * 2016-10-26 2017-02-01 西安电子科技大学 Ultra-low voltage comparator circuit for maximum power point tracking (MPPT) circuit and MPPT circuit

Similar Documents

Publication Publication Date Title
Safari et al. Simulation and hardware implementation of incremental conductance MPPT with direct control method using cuk converter
Hua et al. Implementation of a DSP-controlled photovoltaic system with peak power tracking
US7969133B2 (en) Method and system for providing local converters to provide maximum power point tracking in an energy generating system
US7991511B2 (en) Method and system for selecting between centralized and distributed maximum power point tracking in an energy generating system
US7521914B2 (en) Photovoltaic DC-to-AC power converter and control method
Wai et al. Grid-connected photovoltaic generation system
US9077206B2 (en) Method and system for activating and deactivating an energy generating system
US8390261B2 (en) Maximum power point tracker bypass
US8139382B2 (en) System and method for integrating local maximum power point tracking into an energy generating system having centralized maximum power point tracking
US8279644B2 (en) Method and system for providing maximum power point tracking in an energy generating system
JP5503745B2 (en) Photovoltaic power generation system, control device used in solar power generation system, control method and program thereof
JP5621094B2 (en) Localized power point optimizer for solar cell devices
US7042195B2 (en) Method of controlling photovoltaic power generation system
Chen et al. A cost-effective single-stage inverter with maximum power point tracking
KR102037989B1 (en) Maximum power point tracking for power conversion system and method thereof
Won et al. A new maximum power point tracker of photovoltaic arrays using fuzzy controller
KR101076988B1 (en) A method for activating a multi-string inverter for photovoltaic plants
US20070236187A1 (en) High-performance solar photovoltaic ( PV) energy conversion system
Lian et al. A maximum power point tracking method based on perturb-and-observe combined with particle swarm optimization
Kobayashi et al. A study of a two stage maximum power point tracking control of a photovoltaic system under partially shaded insolation conditions
Chen et al. Multiinput inverter for grid-connected hybrid PV/wind power system
TWI390817B (en) Series solar system with current-matching function
US20120161526A1 (en) Dc power source conversion modules, power harvesting systems, junction boxes and methods for dc power source conversion modules
Hua et al. Comparative study of peak power tracking techniques for solar storage system
EP2128972B1 (en) High efficiency multi-source photovoltaic inverter

Legal Events

Date Code Title Description
A621 Written request for application examination

Effective date: 20051212

Free format text: JAPANESE INTERMEDIATE CODE: A621

A131 Notification of reasons for refusal

Free format text: JAPANESE INTERMEDIATE CODE: A131

Effective date: 20081209

A02 Decision of refusal

Free format text: JAPANESE INTERMEDIATE CODE: A02

Effective date: 20090407