JP2012029542A - Hybrid power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device in which power generation means is connected to a voltage stabilization device, and that requires no individual inverter, and that performs control with efficiency to utilize natural energy efficiently, and that supplies a voltage to a load with stability to enable to save energy, and that prevents steep rise or fall in load supply voltage control to enable to stabilize power supplying.SOLUTION: A hybrid power supply device 1 has: a voltage stabilization device 13 consisting of a full-bridge converter 5, a full-bridge inverter 6, a capacitor 7, a reactor 8, an output reactor 10, and a main circuit controller 12; photovoltaic power generating means 14; power failure detecting means 15; and command value changing means 16.

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 2002-270884 A (Summary, FIG. 1)

  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 solves the above-described conventional problems, and uses electric power generated from natural energy and supplies power with a stable voltage to a load as in the past. It is an object of the present invention to provide a hybrid power supply apparatus that can achieve both of the above and prevent a steep rise or fall in load supply voltage control and 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. It is composed of a converter and two of the three arms, and includes a full-bridge inverter in which one arm is shared with the full-bridge converter, and a capacitor connected in parallel to the three arms. The full-bridge converter passes through a reactor. An AC power source is connected, and the output of the full bridge inverter is connected to a load through an output reactor, or a power saving device or a voltage stabilizing device, power generation means connected in parallel to the capacitor, and the full bridge converter. As a grid-connected inverter for power generation means A hybrid power supply that controls the voltage supplied to the load by the full-bridge inverter, and includes a power failure detection means for detecting a power failure of the AC power source, and loads based on the detected power failure information And a command value changing means for controlling the command value of the voltage increase or decrease voltage control to be supplied to the battery. This achieves 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. And a full-bridge inverter in which one arm is shared with the full-bridge converter, and a capacitor connected in parallel to the three arms. The full-bridge converter is connected to an AC power source through a reactor, and the output of the full-bridge inverter Is a power saving device configured by connecting to a load through an output reactor, or a voltage stabilizing device, power generation means connected in parallel to the capacitor, and controls the full bridge converter as a grid-connected inverter of the power generation means, and Loaded by the full bridge inverter A hybrid power supply device that controls the voltage to be supplied by increasing or decreasing voltage, and includes a power failure detection means for detecting a power failure of the AC power supply, and controls the voltage increase or decrease of the voltage supplied to the load based on the detected power failure information Use power generated from natural energy by connecting the power generation device to the power-saving device or voltage stabilization device and effectively controlling the inverter. In addition, by supplying power to the load with a stable voltage as before, it is possible to achieve both effective use of power and energy saving, and change the command value based on power failure information of the commercial power supply. It is possible to provide a hybrid power supply apparatus that can prevent a steep rise or fall in control and stabilize power supply.

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 includes a full-bridge inverter that shares one arm with the full-bridge converter, and a capacitor connected in parallel to the three arms. The full-bridge converter is connected to an AC power source through a reactor. The output of the full bridge inverter is connected to a load through an output reactor, a power saving device or a voltage stabilizing device, power generation means connected in parallel to the capacitor, and the full bridge converter connected to the system of the power generation means. Control as a system inverter and A hybrid power supply device for controlling the voltage supplied to the load by the ridge inverter to increase or decrease the 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. Command value changing means for controlling a command value for voltage or voltage drop control is provided. 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.

  Further, in the hybrid power supply device according to claim 2, the power failure detection means determines the power failure by superimposing the disturbance on the AC power supply by the passive detection means for detecting the power failure by detecting the disturbance of the AC power supply and the grid interconnection inverter. And a second command value changing means for changing the command value for the boost voltage or voltage drop control depending on whether the power failure is detected by the passive detection means or the active detection means. is there. As a result, the control suitable for each of the passive method and the active method with different detection time limit and post-detection operation can be performed to prevent the steep rise or fall of the load supply voltage control more effectively. Provided is a hybrid power supply device capable of stabilizing the power.

  Further, the hybrid power supply device according to claim 3 is configured to change the command value of the rising voltage or the falling voltage control so as to reduce the rising voltage width or the falling voltage width when the power failure is detected by the passive detection means. Is. 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.

  According to a fourth aspect of the present invention, the command value changing means is configured to stop the voltage increase or voltage drop control when the power detection is detected by the active detection means. 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

  According to a fifth aspect of the present invention, the command value changing means is configured to determine the command value so that the voltage of the capacitor is within a predetermined range for the voltage increase or voltage drop control. 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 hybrid power supply device according to claim 6 is configured to control so that the voltage rise or voltage drop control during the time from the occurrence of a power failure to the detection of the power failure is limited by a predetermined voltage rise width or a predetermined voltage drop width. Is. 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. The full bridge inverter 6 constituted by the converter 5 and the arms 4b and 4c, the capacitor 7 connected in parallel to the three arms 4a to 4c, and the full bridge converter 5 are connected to the AC power source 9 through the reactor 8, and the full bridge inverter 6 Is connected to a load 11 through an output reactor 10, and as a voltage stabilizing device 13 constituted by a main circuit control unit 12 for controlling the full bridge converter 5 and the full bridge inverter 6, and a power generation means connected in parallel to the capacitor 7. Solar power generation means 14 and full bridge converter 5 Controlled as a grid-connected inverter of the sunlight power generation means 14, and the voltage supplied to the load by the full bridge inverter 6 is controlled to increase or decrease the voltage, and the power failure detection means 15 for detecting the power failure of the AC power source 9 is provided and detected. There is provided command value changing means 16 for controlling a command value for voltage increase or decrease voltage control to be supplied to the load 11 based on the power failure information.

  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 means 15 includes a passive detection means 15a that detects a power failure by detecting a disturbance of the AC power supply 9, and an active detection means 15b that determines a power failure by superimposing the disturbance on the AC power supply 9. 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 9. When the input voltage detection value of the AC power supply 9 passes zero, the zero flag is set and the cycle detection counter 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 that flows when the inductive load is connected to the load 11 cannot be regenerated, so the voltage of the capacitor 7 rises. 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 or decrease control of the voltage supplied to the load 11 is connected to a predetermined voltage increase width (for example, 200 V 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 is configured. 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, any 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 one arm, the full bridge converter is connected to an AC power source through a reactor, and the output of the full bridge inverter is connected to a load through an output reactor, or a voltage stabilizing device And a power generation means connected in parallel to the capacitor, and a hybrid power source that controls the full-bridge converter as a grid-connected inverter of the power generation means, and that controls the voltage supplied to the load by the full-bridge inverter. A power failure detection means for detecting a power failure of the AC power supply, and 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 Therefore, 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, which is useful.

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 Reactor 9 AC power supply 10 Output reactor 11 Load 12 Main circuit control part 13 Voltage stabilization apparatus 14 Sunlight Power generation means 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 (6)

A full-bridge converter composed of two arms out of three arms and three arms in which diodes antiparallel to the switching element are vertically connected in series, and one arm composed of two arms out of three arms A full-bridge inverter shared with the full-bridge converter, and a capacitor connected in parallel to the three arms. The full-bridge converter is connected to an AC power source through a reactor, and the output of the full-bridge inverter is connected to a load through an output reactor. A power saving device configured by connecting, or a voltage stabilizing device, power generation means connected in parallel to the capacitor, and controlling the full-bridge converter as a grid-connected inverter of the power generation means, and loading by the full-bridge inverter Increase the voltage supplied to A hybrid power supply device that controls voltage or voltage drop, and has power failure detection means that detects a power failure of the AC power supply, and controls the command value for voltage increase or decrease voltage control supplied to the load based on the detected power failure information A hybrid power supply apparatus comprising command value changing means for performing the operation. The power failure detection means includes a passive detection means for detecting a power failure 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. 2. The hybrid power supply apparatus according to claim 1, further comprising second command value changing means for changing a command value for increasing voltage or falling voltage control depending on which of the active detecting means detects a power failure. 3. The hybrid power supply apparatus according to claim 2, wherein when a power failure is detected by the passive detection means, the command value for the rising voltage or falling voltage control is changed so as to reduce the rising voltage width or the falling voltage width. 4. The hybrid power supply apparatus according to claim 2, wherein the command value changing means is changed 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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