JP4267541B2 - Power supply - Google Patents

Description

  The present invention relates to a power supply device using inverter technology.

  In recent years, fossil fuel depletion and global warming have occurred due to an increase in the load on ordinary households. Use of clean energy and energy-saving devices such as solar power generation systems, power-saving devices, and system voltage stabilization devices have been developed. It has been demanded.

  Conventionally, this type of power supply device can output a current including a phase advance invalid component as a grid-connected power conversion device that links the generated power of the power generator to the grid side, and can reduce power consumption of a consumer load. Is known (see, for example, Patent Document 1).

  Hereinafter, the power supply apparatus will be described with reference to FIGS. 15 and 16.

As shown in FIG. 15, when a current Iinv including a phase advance invalid component is output from the grid interconnection inverter 101 to the distribution system 102, the supply voltage Vline = Vinv to the consumer general load 103 becomes the grid impedance 104 to the grid voltage Vg. A value obtained by adding the voltage drop Vdif at (R + j × L). (A) of FIG. 16 is an active power adjustment mode in which sunlight is radiated and the DC power supply supplies active power to the distribution system 102. The grid interconnection inverter 101 converts DC power from the DC power supply into AC power. And the vector diagram at the time of supplying electric power to the power distribution system 102 and the consumer general load 103 is shown. In this operation mode, the normal load voltage Vline is higher than the system voltage Vg. Next, FIG. 16B shows a vector diagram when the control of the grid interconnection inverter 101 is changed and reactive power is simultaneously supplied to the distribution system 102 and the consumer general load 103. In this case, as shown in the figure, the load voltage Vline is lower than the system voltage Vg, and the active power and the reactive power are appropriately controlled in consideration of the constant of the system impedance 104, thereby supplying the consumer general load 103. The load voltage Vline can be controlled to a voltage value lower than the rated voltage within a range equal to or higher than the operable lower limit voltage. Therefore, the supply voltage to the consumer general load 103 can be controlled to be lower than the rated voltage, and the power consumption of the consumer general load 103 can be reduced.
JP 2003-153444 A

  In such a conventional power supply device, when the power generation device is concentrated in the area and connected to the system power supply, there is a problem that the voltage of the system power supply rises and the generated power needs to be suppressed, It is required to reliably suppress the increase in system voltage and to effectively use the power generated by the power generator.

  In addition, during the recovery charge of the storage battery, the generated power may be reduced and the specified constant current charge may not be performed, and the time required for the recovery charge becomes longer, or the storage battery is repeated by repeating the recovery charge and the suspended state. Overcharging, that is, there is a possibility of affecting the life of the storage battery, and a power supply device that efficiently performs recovery charging is required.

  Furthermore, in the case of an unstable power supply source such as solar power generation, sufficient generated power cannot be obtained during recovery charging, so that the storage battery voltage decreases and the generated power increases again. If this method is used, there is a problem that the storage battery voltage exceeds the specified voltage, which may affect the life of the storage battery. It is necessary to suppress it.

  It is another object of the present invention to provide a power supply device that can efficiently perform recovery charging and perform charging while suppressing adverse effects on extending the life of a storage battery, even if it is recovery charging using only generated power. .

In order to achieve the above object, the power supply device of the present invention has two arms in which a diode in reverse parallel to a switching element is connected in series up and down, which outputs power generated by the power generating means to the AC power source. A grid-connected inverter having a main circuit control unit for controlling the full-bridge inverter, connected in parallel to the capacitor, and connected to the AC power source. filled electric storage battery in response to vertical fluctuations of the voltage to discharge to charge or AC power supply output power generated from the power generating means, the amount of power required to the constant voltage charging of the generated power is the battery of the power generating means even if no then continue charging, and was configured to Ru and a constant voltage charging means, not counting the charging duration Than is.

  By this means, even when the power generation apparatus is centrally installed, a power supply apparatus that can effectively use the generated power while suppressing an increase in the voltage of the system power supply can be obtained.

In particular, by this means, even if recovery charging is performed only with generated power, recovery charging is performed efficiently, and if the charging efficiency is low, the charging amount is not counted, and the storage battery has a long life. A power supply device that can perform charging while suppressing the above is obtained.

  Moreover, even if it is a case where the generated electric power of an electric power generation means does not satisfy | fill the electric energy required for the constant current charge of a storage battery, it was set as the structure provided with the constant current charge means which continues charging.

  By this means, a power supply device can be obtained that can perform recovery charging efficiently and perform charging while suppressing adverse effects on the extension of the life of the storage battery, even if it is recovery charging using only generated power.

  In addition, the storage battery charging control includes a storage battery voltage suppression unit that suppresses overshoot of the storage battery voltage due to fluctuations in the generated power of the power generation unit.

  By this means, even when recovery charging is performed only with generated power, the voltage of the storage battery can be kept within the specified range, and a power supply device that can perform charging while suppressing adverse effects on the extension of the life of the storage battery is obtained. It is done.

  Furthermore, the storage battery voltage suppression means is configured to include proportional integration control of the storage battery voltage.

  By this means, even when recovery charging is performed only with generated power, the voltage of the storage battery can be kept within the specified range, and a power supply device that can perform charging while suppressing adverse effects on the extension of the life of the storage battery is obtained. It is done.

  Moreover, the storage battery voltage suppression means is configured to include proportional-integral control and differential control of the storage battery voltage.

  By this means, even if there is a steep rise in the storage battery voltage due to recovery charging using only the generated power, the voltage of the storage battery can be kept within the specified range, and charging is performed while suppressing adverse effects on extending the life of the storage battery. A power supply device is obtained.

According to the present invention, a full-bridge inverter configured by two arms in which a diode in reverse parallel to a switching element is connected in series up and down, which outputs power generated by the power generating means to an AC power source, In a grid-connected inverter provided with a capacitor connected in parallel to the two arms and a main circuit control unit for controlling a full bridge inverter, the capacitor is connected in parallel, and according to the vertical fluctuation of the voltage of the AC power supply charging a power storage battery for performing discharge for charging or AC power supply output power generated from the power generation means, even when the generated power of the generator unit does not satisfy the amount of power required to the constant voltage charging of the battery It continues, and is formed to have a structure in which Ru and a constant voltage charging means, not counting the charging duration, power plant of concentrated installation Even when an, while suppressing the voltage rise of the system power source, it is possible to provide a power supply device having the effect that the generated power can be effectively utilized.

And in particular, even in the recovery charging with only outgoing denden force, effectively it performs recovery charge, and not counting the amount of charge when poor charging efficiency, to suppress an adverse effect on the life of the battery It is possible to provide a power supply device that can be charged.

  Moreover, even if the power generated by the power generation means does not satisfy the amount of power required for constant current charging of the storage battery, the power supply is equipped with constant current charging means that continues charging, so that recovery charging using only generated power is possible. Even in this case, it is possible to provide a power supply device that can perform recovery charging efficiently and perform charging while suppressing adverse effects on extending the life of the storage battery.

  Moreover, in the charging control of the storage battery, the storage battery voltage suppression means that suppresses the overshoot of the storage battery voltage due to fluctuations in the generated power of the power generation means is provided. It is possible to provide a power supply device that can make the voltage within a specified range and can perform charging while suppressing adverse effects on extending the life of the storage battery.

  Furthermore, the storage battery voltage suppression means is configured to have a proportional integral control of the storage battery voltage, so that the voltage of the storage battery can be within the specified range even when recovery charging is performed only by the generated power, and the long life of the storage battery Thus, it is possible to provide a power supply device having an effect of being able to perform charging while suppressing adverse effects on the conversion.

  In addition, the storage battery voltage suppression means includes a proportional integral control and a differentiation control of the storage battery voltage, so that the storage battery voltage is kept within a specified range even if there is a sharp increase in the storage battery voltage due to recovery charging only by the generated power. Therefore, it is possible to provide a power supply device that can perform charging while suppressing adverse effects on extending the life of the storage battery.

The invention according to claim 1 of the present invention is constituted by a power generation means and two arms in which a diode in reverse parallel to a switching element is connected in series up and down, which outputs the generated power obtained by the power generation means to an AC power source. In a grid-connected inverter having a full bridge inverter, a capacitor connected in parallel to the two arms, and a main circuit control unit for controlling the full bridge inverter, the capacitor is connected in parallel and the voltage of the AC power supply is comprising a power storage battery in accordance with the fluctuation to discharge for charging or AC power supply output power generated from the power generating means, the generated power of the generator unit does not satisfy the amount of power required to the constant voltage charging of the battery even when continuing the charging, and is obtained by a configuration in which Ru with constant voltage charging means, not counting the charging duration, Even if the collector is focused installed, an effect that it is possible while suppressing the voltage rise of the system power source, to effectively utilize the generated power. In particular, even if the recovery charge is based only on the generated power, the recovery charge is efficiently performed, and if the charging efficiency is poor, the charging amount is not counted and the charging is performed while suppressing the adverse effect on the extension of the life of the storage battery. It has the effect of being able to.

  In addition, the power generation means has a configuration including constant current charging means that continues charging even when the amount of power required for constant current charging of the storage battery is not satisfied. Even if it is charge, it has the effect | action which can perform recovery charge efficiently and can perform charge which suppressed the bad influence with respect to the lifetime extension of a storage battery.

  In addition, in the storage battery charging control, the storage battery voltage suppression means for suppressing the overshoot of the storage battery voltage due to fluctuations in the generated power of the power generation means is provided. Thus, the battery can be charged with an adverse effect on the extension of the life of the storage battery.

  Furthermore, the storage battery voltage suppression means is configured to have a proportional integral control of the storage battery voltage, and the storage battery voltage can be within a specified range even in the recovery charge only by the generated power. It has the effect that it is possible to perform charging while suppressing adverse effects on the life extension.

  In addition, the storage battery voltage suppression means is configured to have proportional integral control and differential control of the storage battery voltage, and even if there is a sharp increase in the storage battery voltage due to recovery charging only by the generated power, the storage battery voltage is regulated within a specified range. It has the effect | action that it can carry out inside and can perform the charge which suppressed the bad influence with respect to the lifetime extension of a storage battery.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

( Assumption example 1 )
FIG. 1 is a configuration diagram of a power supply device according to the first premise example .

  As shown in the figure, a solar cell 1a and a step-up chopper circuit 1b as power generation means 1, and switching elements 3a to 3a that output generated power obtained by raising the power from the solar cell 1a by the step-up chopper circuit 1b to an AC power source 2. A full bridge inverter 6 composed of two arms 5a and 5b in which diodes 4a to 4d antiparallel to 3d are vertically connected in series, a capacitor 7 connected in parallel to the two arms 5a and 5b, and a full bridge inverter 6 In a grid-connected inverter 9 having a main circuit control unit 8 for controlling the power supply, the generator 7 is connected in parallel with the capacitor 7 and the generated power from the power generation means 1 is charged according to the vertical fluctuation of the voltage of the AC power supply 2 or the AC power supply. A storage battery 10a, a charge / discharge circuit 10b, and a charge / discharge control unit as a power storage means 10 for discharging to output to 2. It is constituted by 0c.

  Next, a control flowchart of the charge / discharge control unit 10c will be described with reference to FIG.

  As shown in the figure, the charge / discharge control unit 10c receives the system voltage Vac. When the system voltage Vac exceeds the system upper limit voltage Vac_max, the output current command value of the system interconnection inverter 9 is commanded to be lowered by ΔI. At this time, the output current command value is reduced to zero, and no power is received from the AC power source 2. Due to this command, the supply and demand balance of the generated power is lost, and the voltage of the intermediate capacitor 7 increases. Next, the charge / discharge control unit 10 c inputs the voltage of the capacitor 7. It is determined whether or not the input voltage Vc of the capacitor 7 is higher than the charging threshold value Vch. The command value for the charging current is calculated by inputting to the PI controller from the deviation between the target value Vch * of the voltage of the capacitor 7 and the actual voltage value Vc. Here, if the charging current command value is larger than the chargeable current Ib_cha of the storage battery 10a, the charging current command value is limited to Ib_cha. Further, by limiting the charging current and reducing the output to the AC power source 2, the boost chopper circuit 1b deviates from the MPPT control (maximum power follow-up control) of the solar cell 1a when the supply and demand balance of the generated power is lost. Limit control to constant power control will be performed. On the contrary, when the system voltage Vac falls below the system lower limit voltage Vac_min, the output current command value of the system interconnection inverter 9 is commanded to be increased by ΔI. The command of the output current at this time is limited to the maximum current Iinv_max that can be output from the grid interconnection inverter 9, and limit control is performed. Due to this output current increase command, the supply and demand balance of the generated power is disrupted, so the voltage of the intermediate capacitor 7 decreases. Next, the charge / discharge control unit 10 c inputs the voltage of the capacitor 7. It is determined whether or not the input voltage Vc of the capacitor 7 is lower than the discharge threshold value Vcl. The discharge current command value is calculated by inputting it to the PI controller from the deviation between the target value Vcl * of the voltage of the capacitor 7 and the actual voltage value Vc, as in the case of charging. Furthermore, if the discharge current command value is larger than the dischargeable current Ib_dis of the storage battery 10a, the discharge current command value is limited to Ib_dis.

As described above, according to the first premise example , the solar cell 1a and the boost chopper circuit 1b, and the switching element that outputs the generated power obtained by raising the power from the solar cell 1a by the boost chopper circuit 1b to the AC power source 2. A full bridge inverter 6 composed of two arms 5a and 5b in which diodes 4a to 4d antiparallel to 3a to 3d are connected in series vertically, a capacitor 7 connected in parallel to the two arms 5a and 5b, and a full bridge In a grid-connected inverter 9 having a main circuit control unit 8 for controlling the inverter 6, it is connected in parallel to the capacitor 7, and the generated power from the power generation means 1 is charged according to the vertical fluctuation of the voltage of the AC power supply 2 or Storage battery 10a, charge / discharge circuit 10b, and charge / discharge control section as power storage means 10 for discharging to output to AC power supply 2 By configuring the 0c, and thus capable of charging or discharging the excess power from the full-bridge inverter 6 to the storage battery 10a through the charge-discharge circuit 10b. Further, even when the power generation devices are centrally installed, the generated power can be effectively used while suppressing the voltage increase of the system power supply.

  In this embodiment, the storage battery 10a is used as the storage medium of the storage means 10, but an electric double layer capacitor, a nickel metal hydride battery, a lithium ion battery, or the like may be used.

( Reference Example 1 )
FIG. 3 is a configuration diagram of the power supply device according to the first reference example .

As shown in the figure, the power supply device in Reference Example 1 includes a solar battery 1a and a step-up chopper circuit 1b as power generation means 1, and an AC power source 2 that generates power generated by boosting the power from the solar cell 1a by the step-up chopper circuit 1b. A full bridge inverter 6 composed of two arms 5a and 5b in which diodes 4a to 4d antiparallel to switching elements 3a to 3d connected in series are connected in parallel to the two arms 5a and 5b. In a grid-connected inverter 9 provided with a capacitor 7 and a main circuit control unit 8 for controlling the full-bridge inverter 6, it is connected in parallel to the capacitor 7 and from the power generation means 1 according to the vertical fluctuation of the voltage of the AC power supply 2. A storage battery 10a as a power storage means 10 for charging or discharging the generated power to be discharged or output to the AC power source 2; A circuit 10b and the charge-discharge control section 10c, is constituted by a blocking diode 11a as the inserted, generated power charging means or the recovery charging control means in series between the capacitor 7 and the full-bridge inverter 6.

As described above, according to the first reference example , the storage battery 10a is charged by the storage means 10 by preventing the inflow of power from the AC power source 2 by the backflow prevention diode 11a and charging only the generated power from the power generation means 1. Or the recovery charge of the storage battery 10a can be performed.

( Reference Example 2 )
FIG. 4 is a configuration diagram of the power supply device according to the second reference example .

  As shown in the figure, the power supply apparatus according to the third embodiment includes a solar cell 1a and a boost chopper circuit 1b as power generation means 1, and an AC power source that generates power generated by boosting the power from the solar cell 1a by the boost chopper circuit 1b. 2 is connected in parallel to the two arms 5a and 5b, and a full bridge inverter 6 composed of two arms 5a and 5b in which diodes 4a to 4d antiparallel to the switching elements 3a to 3d are connected in series vertically. In the grid interconnection inverter 9 provided with the capacitor 7 and the main circuit control unit 8 for controlling the full bridge inverter 6, the power generation means 1 is connected in parallel to the capacitor 7 and according to the vertical fluctuation of the voltage of the AC power supply 2. A storage battery 10a serving as a power storage means 10 for performing a discharge for charging or outputting the generated power from the AC power source 2; A discharge circuit 10b and the charge and discharge control unit 10c, and then an inverter blocking control section 11b of the generated power charging unit or recovery charge control means.

  Next, a flowchart of the inverter backflow prevention control unit 11b will be described with reference to FIG.

  As shown in the figure, the inverter backflow prevention control unit 11b transmits an output lower limit value setting so that the output power command value of the main circuit control unit 8 that controls the full bridge inverter 6 always takes a positive value Po_min. The charging / discharging circuit 10b controls the voltage of the capacitor 7 to be Vc_cha during charging. For this reason, when the generated power becomes insufficient, the voltage of the capacitor 7 decreases. Accordingly, since the main circuit control unit 8 that controls the full bridge inverter 6 always operates with the positive value Po_min as the output lower limit value, the charge / discharge circuit 10b controls the decrease in the voltage of the capacitor 7, and the storage battery 10a is controlled. In the operation control that has been controlled to charge, the charging current is reduced and the control is switched to the discharge control.

  As described above, according to the third embodiment, charging of the storage battery 10a of the power storage means 10 is controlled by the inverter backflow prevention control unit 11b so that the AC power supply 2 is always output. Therefore, only the generated power from the power generation means 1 can be charged or recovered.

(Embodiment 1 )
Figure 6 shows a block diagram of a power supply device according to the first embodiment.

As shown in the figure, the power supply device according to the first embodiment has constant current charging that continues charging even when the power generated by the power generation means 1 does not satisfy the amount of power required for constant current charging of the storage battery 10a. Means 12 and constant voltage charging means 13 that continues charging even when the power generated by the power generation means 1 does not satisfy the amount of power required for constant voltage charging of the storage battery 10a, and does not count the charging duration. In the charging control of the storage battery 10a, the storage battery voltage suppression means 14 is configured to suppress the overshoot of the voltage of the storage battery 10a due to fluctuations in the generated power of the power generation means 1.

  Next, a flowchart of the constant current charging unit 12 will be described with reference to FIG.

  As shown in the figure, the constant current charging means 12 inputs a recovery charge flag signal indicating that recovery charging is being performed and a recovery charge enable flag signal indicating whether or not there is generated power necessary for recovery charging. When both of the input recovery charge flag signal and recovery charge enable flag signal are ON, that is, during recovery charge and there is no necessary generated power, control is performed so that the voltage of the capacitor 7 becomes constant. Charge control is performed while keeping the voltage of 7 constant. The upper limit value of the charging current at this time uses a command value at the time of constant current charging of the storage battery 10a and prevents overcharging to the storage battery 10a. Therefore, when the generated power increases to a charge amount that exceeds the command value for constant current charging of the storage battery 10a, it is saturated by the command value at the time of constant current charging, which is the upper limit value, and does not become a command exceeding the upper limit value. is doing.

  Next, a flowchart of the constant voltage charging unit 13 will be described with reference to FIG.

  As shown in the figure, the constant voltage charging means 13 starts counting the charging duration when the voltage of the storage battery 10a reaches the specified voltage during the recovery charging and the charging current at that time becomes smaller than the specified value. . Thereafter, when the generated power decreases and the constant voltage charging of the storage battery 10a cannot be continued, the charging of the storage battery 10a is continued, but the counting of the charging duration time is interrupted. The counting of the charging duration time is resumed when the generated power becomes enough generated power for the recovery charge again, and the voltage of the storage battery 10a reaches the specified voltage and at the same time becomes smaller than the specified charging current. The initial value of the count of the charge continuation time at the time of resumption is the count value when charging is interrupted.

  Next, the control block of the storage battery voltage suppression means 14 will be described with reference to FIG.

  As shown in the figure, the storage battery voltage suppression means 14 is composed of a control block for constant voltage charging and a control block for constant current charging. The control block at the time of constant voltage charging determines the charging current from the deviation between the voltage target value of the storage battery 10a and the actual voltage of the storage battery 10a. The charge current command value is calculated by inputting the deviation into the PI controller. Next, the control block at the time of constant current charge transmits a command to the charge / discharge control unit 10c by inputting the deviation between the charge current target value of the storage battery 10a and the actual charge current to the PI controller. Furthermore, when the rate of increase of the voltage of the storage battery 10a is fast, it is possible to add differential control as shown in FIG. 10 and input the voltage of the storage battery 10a to the PID controller. The voltage of the storage battery 10a is sequentially input to the input of the differential control, and calculation is performed by multiplying the voltage change amount of the storage battery 10a by a differential gain. Thereby, the voltage of the storage battery 10a is controlled not to exceed the specified voltage regardless of the state of charge.

  In FIG. 11, the example of a result which suppressed the voltage rise of the storage battery 10a by the storage battery voltage suppression means 14 is shown.

  As shown in the figure, the voltage of the storage battery 10a is controlled so that the initial rising speed at the start of charging is equivalent to that of a normal PI controller, and the specified voltage is not exceeded when the voltage of the storage battery 10a increases. Is possible.

As described above, according to the first embodiment, since the generated power is effectively charged during the recovery charging of the storage battery 10a, the storage battery 10a can be charged even when the specified current cannot be charged. . In addition, if the storage battery 10a is near full charge and the charging control is switched to constant voltage charging, and the generated power is insufficient, the charging efficiency of the storage battery 10a deteriorates, so the charging count is stopped and the life of the storage battery 10a is extended. Can be achieved. Further, when the generated power is reduced during the recovery charging to the storage battery 10a and the voltage of the storage battery 10a is temporarily reduced, even when restarting from constant current charging, it is equivalent to normal charging. By ensuring the charging rising speed, charging can be started and continued at an early stage, and the voltage of the storage battery 10a can be controlled without exceeding the specified voltage.

( Reference Example 3 )
FIG. 12 is a configuration diagram of the power supply device according to the third reference example .

As shown in the figure, in the power supply device in Reference Example 3 , during the recovery charging of the storage battery 10a, the priority order of the power supply of the generated power is priority control means 15 that gives the storage battery 10a the highest priority, and the recovery charging of the storage battery 10a. In this case, the power supply priority order of the generated power includes the second priority control means 16 that gives the highest priority to the output to the AC power supply 2.

  Next, a flowchart of the priority control means 15 will be described with reference to FIG.

  As shown in the figure, the priority order control means 15 inputs a recovery charge flag signal and determines whether or not it is recovery charge. As a result of the determination, if recovery charging is being performed, a command is transmitted so that the main circuit control unit 8 that controls the full bridge inverter 6 operates in the voltage control mode of the capacitor 7. Furthermore, the priority order control means 15 transmits a command to the charge / discharge control unit 10c to perform constant current charge control.

  Next, the flowchart of the second priority control means 16 will be described with reference to FIG.

  As shown in the figure, the second priority control means 16 transmits a constant power control command to the main circuit control unit 8 that controls the full bridge inverter 6 when the recovery charge is not being performed from the recovery charge flag signal. Further, the second priority order control means 16 sends a command to the charge / discharge control unit 10c to control the voltage of the capacitor 7.

As described above, according to the third embodiment , the priority control unit 15 supplies the generated power to the first priority for the management and the life extension of the storage battery 10a during the recovery charge, and the second priority. By means of the forward control means 16, the generated power can be fed with the output to the grid being given the first priority at times other than recovery charging. Therefore, even if it is recovery charge only of generated electric power, recovery charge can be implemented efficiently, and since only the required capacity is provided with the storage battery 10a, the capacity of the storage battery 10a can be minimized, and the entire apparatus can be downsized. Can be achieved.

  Since the power generation means using solar cells and fuel cells can be easily connected to the capacitor in parallel, the generated power can be easily peak shifted using the power storage means. It can also be applied to households that require power, and by automatically determining the impedance on the AC power supply side, output suppression during grid interconnection can be predicted in advance, so that harmony with the system side is aimed at It can also be applied to centralized interconnection applications where necessary.

Configuration diagram of power supply device according to precondition example 1 of the present invention Control flowchart of the charge / discharge control unit The block diagram of the power supply device of the reference example 1 of this invention The block diagram of the power supply device of the reference 2 of this invention Flow chart of the inverter backflow prevention control unit Configuration diagram of power supply device according to Embodiment 1 of the present invention Flow chart of identification current charging means Flowchart of identification voltage charging means Control block diagram of the storage battery voltage suppression means (during PI control) Control block diagram of the storage battery voltage suppression means (during PID control) (A) The figure which shows the Example at the time of exceeding the same storage battery voltage upper limit (b) The figure which shows the Example at the time of the rise suppression of the storage battery voltage The block diagram of the power supply device of the reference example 3 of this invention Flow chart of the same priority control means Flow chart of the second priority control means Block diagram of a conventional power supply (system-connected inverter) Vector diagram when controlling the supply voltage

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Power generation means 2 AC power source 3 Switching element 4 Diode 5 Arm 6 Full bridge inverter 7 Capacitor 8 Main circuit control part 9 System interconnection inverter 10a Storage battery 10b Charge / discharge circuit 10c Charge / discharge control part 11a Backflow prevention diode 11b Inverter backflow prevention control part 12 constant current charging means 13 constant voltage charging means 14 storage battery voltage suppression means 15 priority order control means 16 second priority order control means

Claims (5)

A full-bridge inverter composed of two arms in which a diode in reverse parallel to a switching element is connected in series up and down, which outputs the generated power obtained by the power generation means to an AC power source, and in parallel with the two arms And a grid-connected inverter having a main circuit control unit for controlling a full-bridge inverter, and connected to the capacitor in parallel, and generated power from the power generation means according to the vertical fluctuation of the voltage of the AC power supply. and a power storage pond for performing discharge for charging or AC power output, generated power of the generator means continues to charge even when not satisfied the amount of power required for constant-voltage charging of the battery, And a constant voltage charging means that does not count the charging duration time . 2. The power supply apparatus according to claim 1, further comprising a constant current charging unit that continues charging even when the generated power of the power generation unit does not satisfy the amount of power required for constant current charging of the storage battery. 2. The power supply apparatus according to claim 1, further comprising a storage battery voltage suppression unit that suppresses overshoot of the storage battery voltage due to fluctuations in power generated by the power generation unit in charge control of the storage battery. The power supply apparatus according to claim 3 , wherein the storage battery voltage suppression means includes proportional-integral control of the storage battery voltage. The power supply apparatus according to claim 3 , wherein the storage battery voltage suppression means includes proportional-integral control and differential control of the storage battery voltage.

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