JP5609379B2 - Hybrid power supply - Google Patents

Description

  The present invention is applied to a power generation unit such as a solar battery and a hybrid power supply device that controls a supply voltage to a load. Based on a power failure information of a commercial power supply, the supply voltage to the load is controlled to The present invention relates to a hybrid power supply apparatus that contributes to the prevention of overvoltage, the expansion of voltage distortion, and the control stability when the control limit of a supply voltage to a load is reached.

  Conventionally, this type of power supply device (voltage supply control device for load) is known for home use or business use, which has a function of reducing excessive voltage of AC voltage and reducing power consumption (for example, , See Patent Document 1).

  In Patent Document 1, as shown in FIG. 4, a power saving device 101 includes a series transformer 104 arranged between an AC power supply 102 and a load 103, and an output side connected to a secondary winding of the series transformer 104. By providing the regenerative inverter 105, the voltage applied to the load 103 is controlled. Also, with this configuration, by continuously controlling the output of the regenerative inverter 105, the voltage applied to the load 103 can be continuously controlled, and stable power saving power can be supplied to the load 103 side.

  Moreover, in the grid-connected inverter linked to the grid, based on the detection signal of the single operation, for example, in the passive method, the gate block of the inverter unit is performed. In general, it is generally known that control is performed so that the system is disconnected from the system when it is identified as isolated operation.

JP 2002-335630 A

However, in the example of Patent Document 1, it is possible to control the load voltage continuously by using an inverter, and to effectively use power by increasing the power saving effect by supplying stable power saving power to the load. Yes, but you can't use natural energy. In addition, the grid-connected inverter can be used by converting the power extracted from natural energy into usable energy and linking it with the grid power supply. However, the load voltage is continuously controlled to save power to the load. There is a problem that it is impossible to control electric power and make effective use of electric power. From the viewpoint of preventing environmental destruction and global warming, effective use of electric power and energy saving using natural energy are strongly demanded.

  Further, the isolated operation detection in the conventional photovoltaic power generation system has a problem that it directly affects the supply voltage to the load immediately after the isolated operation state is reached, and stability for power supply is required.

  Therefore, the present invention makes use of electric power generated from natural energy and supplies power with a stable voltage to the load as before, enabling both effective use of electric power and energy saving, and load supply. It is an object of the present invention to provide a hybrid power supply apparatus that can prevent a steep rise or fall in voltage control and can stabilize power supply.

In order to achieve this object, the hybrid power supply device of the present invention has three arms in which diodes antiparallel to the switching elements are connected in series up and down, and is a full bridge configured by two of the three arms. Consists of a converter, two of the three arms, a full-bridge inverter that shares one arm with the full-bridge converter, a capacitor connected in parallel to the three arms, an AC power supply, and a primary winding in series And a power saving device comprising a series transformer in which a secondary winding is connected in series from the output of the full bridge inverter through a reactor, and the main circuit control unit for controlling the full bridge converter and the full bridge inverter, or A voltage stabilizing device; and power generation means connected in parallel to the capacitor; A hybrid power supply device that controls the full bridge converter as a grid-connected inverter of the power generation means, and controls the voltage supplied to the load by the full bridge inverter and a series transformer, wherein the voltage is supplied to the load. A power failure detection means for detecting a power failure is provided , comprising command value changing means for controlling a command value for voltage increase or decrease voltage control to be supplied to the load based on the detected power failure information, the power failure detection means comprising an AC power supply Passive detection means for detecting a power outage and detecting a power failure, and active detection means for determining a power failure by superimposing a disturbance on an AC power supply by a grid-connected inverter, wherein the command value changing means is the passive detection means or depending on which at it has detected a power outage of the active detection unit, and changes the command value of the temperature voltage or voltage drop control And than, thereby it is to achieve the intended purpose.

According to the present invention, a full-bridge converter including three arms in which diodes antiparallel to the switching element are connected in series in the vertical direction is configured by two arms out of the three arms, and two arms out of the three arms. A full bridge inverter with one arm shared with the full bridge converter, a capacitor connected in parallel with the three arms, an AC power supply and a primary winding connected in series, and a reactor from the output of the full bridge inverter Through a series transformer in which secondary windings are connected in series, a power saving device constituted by a main circuit control unit for controlling the full bridge converter and a full bridge inverter, or a voltage stabilizing device, and connected in parallel to the capacitor Power generation means and grid connection of the full-bridge converter with the power generation means A hybrid power supply device that controls the voltage supplied to the load by the full bridge inverter and the series transformer, and controls the voltage to be increased or decreased, and includes a power failure detection means that detects a power failure of the AC power source. Command value changing means for controlling the command value of the voltage increase or decrease voltage control to be supplied to the load based on the power failure information , wherein the power failure detection means detects a power failure by detecting disturbance of the AC power supply. And an active detection means for determining a power failure by superimposing a disturbance on the AC power supply by a grid-connected inverter, and whether the command value changing means has detected a power failure by the passive detection means or the active detection means depending on, in the configuration for changing the command value of the temperature voltage or voltage drop control, the power generating means connected to the power-saving device or a voltage stabilizer, in By effectively controlling the data, the power generated from natural energy can be used, and the power can be supplied at a stable voltage to the load as before, enabling both effective use of power and energy saving. In addition, since the command value is changed based on the power failure information of the commercial power supply, it is possible to provide a hybrid power supply apparatus that can prevent a sudden increase or decrease in load supply voltage control and can stabilize power supply. it can.

Configuration diagram of hybrid power supply apparatus according to Embodiment 1 of the present invention Flow chart of the power failure detection means 15 Flow chart of the command value changing means 16 Configuration diagram of a conventional power supply device (voltage supply control device for load)

The hybrid power supply apparatus according to claim 1 of the present invention includes three arms in which diodes antiparallel to the switching elements are connected in series in the vertical direction, a full bridge converter configured by two of the three arms, and three It is composed of two arms, and a full-bridge inverter in which one arm is shared with a full-bridge converter, a capacitor connected in parallel to the three arms, an AC power source and a primary winding are connected in series, and A series transformer in which a secondary winding is connected in series from the output of the full bridge inverter through a reactor, and a power saving device or a voltage stabilization device configured by the full bridge converter, a main circuit control unit for controlling the full bridge inverter; Power generating means connected in parallel to the capacitor, and the full bridge capacitor A hybrid power supply device that controls the voltage supplied to the load by the full-bridge inverter and a series transformer, and controls the power supply as a grid interconnection inverter of the power generation means. comprising a power failure detection means detect, with a command value changing means for controlling a command value of the temperature voltage or voltage drop control voltage supplied to the load based on the detected power failure information, the power failure detection means, the disturbance of the AC power source A passive detection means for detecting a power failure by detecting a power failure and an active detection means for judging a power failure by superimposing a disturbance on an AC power supply by a grid-connected inverter, wherein the command value changing means is the passive detection means or the active According to which of the detection means detects the power failure, the command value for the control of the rising voltage or the falling voltage is changed . As a result, the power generation means is connected to the power saving device or the voltage stabilization device, and the inverter is effectively controlled, so that the power generated from the natural energy is used, and the power is supplied with the stable voltage to the load as before. Supplying power enables both efficient use of power and energy savings, and changes command values based on power failure information of commercial power supplies, preventing sudden increase or decrease in load supply voltage control and power supply Provided is a hybrid power supply device capable of stabilizing the power.

Also, different passive schemes of operation after detecting the detection timing, by performing an active method control suitable for each, to prevent a steeper rise in the effective load supply voltage control, or a reduction, power supply Provided is a hybrid power supply device capable of stabilizing the power.

Also, when detecting a power failure in passive detection means, the command value of the temperature voltage or voltage drop control is obtained by a configuration to be modified to reduce the temperature voltage width or voltage drop width. Thus, it is possible to provide a hybrid power supply device capable of stably and stably restarting the load supply voltage control at the same time as the return processing from the gate block control when the power failure detection function based on passive detection operates unnecessary.

Further, command value change means, when detecting a power failure in the active detection unit, in which a configuration to be changed to stop the rise voltage or voltage drop control. As a result, the power failure detection function based on active detection can quickly eliminate an unnecessary operation, that is, an imbalance in power balance when the circuit is disconnected, and a stable control operation can be performed without increasing the capacitor voltage. Provided is a hybrid power supply capable of

Further, command value changing means, raising the voltage or the voltage drop control is obtained by an arrangement for determining a command value such that the voltage of the capacitor is within a predetermined range. As a result, it is possible to control based on the power balance when a power failure is detected regardless of whether it is passive detection or active detection. To do.

Further, the temperature voltage or voltage drop control time from power failure occurs until the power failure detection is obtained by the configuration of controlling to limit at a predetermined temperature voltage range or a predetermined voltage drop width. As a result, a hybrid power supply apparatus that can prevent an unnecessary increase in the command voltage for the step-up / step-down control operation when the single operation state from the occurrence of a power failure to the detection of the power failure occurs, and enables a stable control operation. I will provide a.

(Embodiment 1)
Hereinafter, the configuration of the hybrid power supply apparatus 1 will be described with reference to FIG. As shown in FIG. 1, the hybrid power supply apparatus 1 includes three arms 4a to 4c in which diodes 3a to 3f antiparallel to switching elements 2a to 2f are connected in series in the vertical direction, and is a full bridge configured by the arms 4a and 4b. A full bridge inverter 6 constituted by a converter 5 and arms 4b and 4c, a capacitor 7 connected in parallel to the three arms 4a to 4c, an AC power supply 8 and a primary winding 9a are connected in series, and the full bridge inverter 6 A voltage stabilizer 12 comprising a series transformer 9 in which a secondary winding 9b is connected in series from the output of the power supply through a reactor 10, a main circuit controller 11 for controlling the full bridge converter 5 and the full bridge inverter 6, and a capacitor The solar power generation means 13 as the power generation means connected in parallel with the The hybrid power source is configured to control the output of the power generated by the sunlight power generation means 13 to the AC power source 8 and to control the voltage supplied to the load 14 by the full bridge inverter 6 and the series transformer 9. The apparatus 1 is provided with a power failure detection means 15 for detecting a power failure of the AC power supply 8, and based on the detected power failure information (for example, a flag indicating a power failure), a command value for increasing or decreasing the voltage supplied to the load 14 Is provided with command value changing means 16 for controlling.

  Next, the flowchart of the power failure detection means 15 will be described with reference to FIG.

  As shown in the figure, the power failure detection unit 15 includes a passive detection unit 15a that detects a power failure by detecting a disturbance of the AC power supply 8, and an active detection unit 15b that determines a power failure by superimposing the disturbance on the AC power source 8. The second command value changing means 15c is provided for changing the command value for the voltage increase or voltage drop control depending on whether the passive detection means 15a or the active detection means 15b detects a power failure. The passive detection means 15a inputs the voltage detection value of the AC power supply 8. When the input voltage detection value of the AC power supply 8 passes zero, a zero flag is set, the count value of the period detection counter is stored, and the current counter value is reset. The cycle detection counter always counts up, and the count number of the zero cross cycle is sequentially stored and updated. When the deviation exceeds the predetermined count number by sequentially comparing with the count number of the zero-cross cycle and the specified count number corresponding to the half cycle of the basic power supply frequency f (50 Hz or 60 Hz), it is determined as a power failure, and the predetermined count number If it is below, it determines with it being in a healthy state. Next, the active detection means 15b performs the regenerative current control by adding Δf for the frequency disturbance to the power supply frequency f. The regenerative current control is controlled by appropriately switching the switching elements 2a to 2d. At this time, when the count number of the zero crossing period fluctuates according to the addition of Δf, Δf is further added to perform regenerative current control. This process is repeated to determine that a power failure occurs when the count number of the zero-cross cycle falls below the predetermined count number, that is, when the power supply frequency rises, and the state where the count number exceeds the predetermined value is continued, or the basic power supply frequency f When it approaches, it is determined that the sound is healthy and the frequency disturbance in the regenerative current control is returned to the initial value.

  Next, the flowchart of the voltage increase / decrease voltage control when the power failure is detected by the passive detection means 15a or the active detection means 15b, that is, the flowchart of the command value changing means 16, will be described with reference to FIG.

  As shown in the figure, when the command value changing unit 16 detects a power failure by the passive detection unit 15a, the command value changing unit 16 decreases the voltage increase width or the voltage drop width according to either the voltage increase or voltage drop control at that time, When a power failure is detected by the active detection means 15b, the rising voltage or falling voltage control is stopped. At this time, the step-up / step-down control is performed within a predetermined range of the voltage of the capacitor 7 (for example, 340 to 360 V when connected to a commercial power source of 200 V, 170 to when it is connected to a commercial power source of 100 V. The command value is determined by proportional integral control so as to be 180V). Here, since the full bridge converter 5 is gate-blocked or stopped, the electric power flowing in through the series transformer 9 cannot be regenerated, so that the voltage of the capacitor 7 increases. Proportional integral control is performed according to the rising speed at this time.

  Further, since the power failure is not recognized in the time from the occurrence of the power failure to the detection of the power failure, the voltage increase / decrease control of the voltage supplied to the load 14 is connected to a predetermined voltage increase width (for example, 200V commercial power supply). If it is connected to a commercial power supply of 20V or 100V, it is connected to a commercial power supply of 20V or 100V if it is connected to a predetermined voltage drop width (for example, a commercial power supply of 200V). In such a case, the control is configured so as to limit at 6V).

  As described above, power generation means is connected to the voltage stabilization device, and the inverter is effectively controlled, so that power generated from natural energy is used and power is supplied to the load with a stable voltage as before. This makes it possible to achieve both effective use of power and energy saving, and to change the command value based on the power failure information of the commercial power supply. A hybrid power supply device that can be stabilized can be provided.

  In addition, by carrying out control suitable for each of the passive method and active method in which the detection time limit by the power failure detection means and the operation after detection are different, it is possible to more effectively prevent the sudden increase or decrease in load supply voltage control. Thus, a hybrid power supply device capable of stabilizing the power supply can be provided.

  In addition, when the power failure detection function based on passive detection operates unnecessary, the load supply voltage control can be restarted quickly and stably simultaneously with the return processing from the gate block control, eliminating the power failure detection function using active detection means. It is possible to provide a hybrid power supply apparatus that can quickly release an imbalance in power balance during operation, that is, disconnection, and can perform a stable control operation without increasing the voltage of the capacitor.

  In addition, since the command value is determined so that the voltage of the capacitor is within a predetermined range, the voltage increase or decrease voltage control is performed when a power failure is detected regardless of whether it is passive detection or active detection. Since control based on balance is possible, a hybrid power supply apparatus that can enable more stable control operation can be provided.

  In addition, the voltage increase or decrease control for the time from the occurrence of a power outage to the detection of the power outage is controlled so as to be limited by a predetermined voltage step-up or a predetermined voltage step-down, so that the stand-alone operation from the time of the power outage to the detection of the power outage It is possible to provide a hybrid power supply apparatus that can prevent an increase in command voltage that is unnecessary for the step-up / step-down control operation when the state is reached, and that enables a stable control operation.

  In addition, although the passive detection means showed the voltage phase jump detection system, it is good also as other detection systems (for example, frequency change rate detection system etc.), and although the active detection means also showed the frequency shift system, others The detection method (for example, reactive power fluctuation method or the like) may be used.

  In addition, although an example of the predetermined range of the capacitor is shown, other ranges may be used in consideration of the withstand voltage of the capacitor and the commercial power supply voltage.

  Further, the predetermined value of the voltage boost / buck voltage supplied to the load is also shown as an example, but the target voltage obtained by adding the commercial power supply voltage and the voltage boost / buck width is within the range of 180 to 220V in the case of the 200V system, the 100V system In this case, other voltage may be used as long as it is within the range of 95 to 107V.

  A hybrid power supply apparatus according to the present invention includes a full bridge converter configured by three arms in which diodes antiparallel to switching elements are connected in series up and down, a full bridge inverter sharing one arm with a full bridge converter, and the 3 A capacitor connected in parallel to two arms, a series transformer in which an AC power source and a primary winding are connected in series, and a secondary winding is connected in series through the reactor from the output of the full bridge inverter, and the full bridge converter, A power saving device or voltage stabilization device configured by a main circuit control unit that controls a full bridge inverter, a power generation unit connected in parallel to the capacitor, and the full bridge converter as a grid interconnection inverter of the power generation unit. And directly with the full-bridge inverter. A hybrid power supply device that controls the voltage supplied to the load by a transformer by increasing or decreasing voltage, and includes a power failure detection means for detecting a power failure of the AC power supply, and the voltage supplied to the load is increased based on the detected power failure information. Since the command value changing means for controlling the command value for voltage or voltage drop control is provided, it is possible to provide a hybrid power supply apparatus that can be applied not only to solar power generation but also to other power generation means such as a fuel cell. It is.

DESCRIPTION OF SYMBOLS 1 Hybrid power supply device 2a-2f Switching element 3a-3f Diode 4a-4c Arm 5 Full bridge converter 6 Full bridge inverter 7 Capacitor 8 AC power supply 9 Series transformer 9a Primary winding 9b Secondary winding 10 Reactor 11 Main circuit control part DESCRIPTION OF SYMBOLS 12 Voltage stabilizer 13 Solar power generation means 14 Load 15 Power failure detection means 15a Passive detection means 15b Active detection means 15c Second command value change means 16 Command value change means

Claims (5)

It has three arms that are connected in series with a diode in antiparallel with the switching element,
A full-bridge converter composed of two of the three arms;
A full bridge inverter composed of two of the three arms, one arm shared with the full bridge converter,
A capacitor connected in parallel to the three arms;
A series transformer in which an AC power source and a primary winding are connected in series, and a secondary winding is connected in series from the output of a full-bridge inverter through a reactor;
A power saving device constituted by a main circuit control unit for controlling the full bridge converter, a full bridge inverter, or a voltage stabilizing device;
Power generation means connected in parallel to the capacitor;
A hybrid power supply apparatus that controls the full-bridge converter as a grid-connected inverter of the power generation means, and controls a voltage supplied to a load by the full-bridge inverter and a series transformer to increase or decrease voltage,
A power failure detection means for detecting a power failure of the AC power supply, a command value changing means for controlling a command value for voltage increase or decrease voltage control supplied to the load based on the detected power failure information ,
The power failure detection means includes a passive detection means for detecting a power outage by detecting a disturbance of the AC power supply, and an active detection means for determining a power failure by superimposing the disturbance on the AC power supply by a grid-connected inverter,
The hybrid power supply apparatus, wherein the command value changing means changes a command value for increasing voltage or decreasing voltage control depending on whether the power failure is detected by the passive detecting means or the active detecting means . When detecting the power failure by passive detection means, the command value of the temperature voltage or voltage drop control hybrid power supply apparatus according to claim 1, wherein the change to reduce the temperature voltage width or voltage drop width. The hybrid power supply apparatus according to claim 1 or 2 , wherein the command value changing means changes so as to stop the rising voltage or falling voltage control when the active detection means detects a power failure. 2. The hybrid power supply apparatus according to claim 1, wherein the command value changing means determines the command value so that the voltage of the capacitor falls within a predetermined range in the voltage increase or voltage drop control. 2. The hybrid power supply apparatus according to claim 1, wherein the rising voltage or falling voltage control for the time from the occurrence of a power failure to detection of the power failure is controlled so as to be limited by a predetermined rising voltage width or a predetermined lower voltage width.

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