KR102402372B1 - Power conversion system for capacitive deionization module linked photovoltaic module, method of regenerating energy using thereof and computer readable medium - Google Patents

Abstract

A photovoltaic module-linked power conversion system of a capacitive desalination module, an energy recovery method using the same, and a computer-readable recording medium are provided. The photovoltaic module-linked power conversion system of the capacitive desalination module includes a capacitive desalination module, a photovoltaic module for supplying power by sunlight to the capacitive desalination module, and an AC voltage supplied from an AC power source during water purification. Bidirectional power that supplies the converted DC voltage and the DC voltage supplied from the solar module to the capacitive desalination module, and converts the DC voltage at both ends of the capacitive desalination module into AC voltage when water is discharged to be regenerated into the AC power source It may include a conversion module and a single processor for controlling the solar module and the bidirectional power conversion module.

Description

POWER CONVERSION SYSTEM FOR CAPACITIVE DEIONIZATION MODULE LINKED PHOTOVOLTAIC MODULE, METHOD OF REGENERATING ENERGY USING THEREOF AND COMPUTER READABLE MEDIUM

The present invention relates to a photovoltaic module-linked power conversion system of a capacitive desalination module, an energy recovery method using the same, and a computer-readable recording medium.

Capacitive DeIonization (CDI) is a kind of electro-adsorption technology. When an electric potential is applied to the electrode, the ionic substances move and adsorb to the electrode surface by the adsorption reaction in the electric double layer formed on the electrode surface ( ion adsorption reaction), when the adsorption capacity of the electrode reaches its limit, the electrode is regenerated by short-circuiting the charged electrode to desorb ionic materials (ion desorption reaction).

As described above, the electro-absorption technology is very easy to operate because it can absorb and desorb ions by changing only the potential of the electrode. Also, since the applied potential is operated at a low voltage where electrolysis does not occur, energy consumption is lower than that of the existing desalination process. There are features that can be significantly reduced.

However, in the existing capacitive desalination module, when the electrode is regenerated after the ionic material is adsorbed to the electrode, the charged electrode is short-circuited and consumed as thermal energy through the resistor. There is a risk of fire.

Therefore, in order to reduce overall energy consumption, it is possible to use a power conversion system in connection with renewable energy such as sunlight. However, if the capacitive desalination module is directly connected to the existing solar power conversion system, the power received from the solar module is converted to DC/DC power to match the grid and voltage level, and then DC/AC power conversion is performed again. Here, AC power is received from the grid, converted back to DC power, and DC/DC power conversion is performed again to match the electrical insulation and voltage size. The process is complicated, and there is a problem in that cost and power loss occur a lot in the process.

Korean Patent Application Laid-Open No. 2011-0071701 ('Electrosorption deionization device', publication date: June 29, 2011)

The present invention integrates a photovoltaic module and a capacitive desalination module into one system to increase control responsiveness, and at the same time, a capacitive desalination module that can increase power efficiency by using renewable energy An object of the present invention is to provide a conversion system, an energy recovery method using the same, and a computer-readable recording medium.

According to an embodiment of the present invention, a capacitive desalination module; a solar module for supplying power by sunlight to the capacitive desalination module; The DC voltage converted from the AC voltage supplied from the AC power supply during water purification and the DC voltage supplied from the photovoltaic module are supplied to the capacitive desalination module, and the DC voltage across the capacitive desalination module is converted to an AC voltage when water is discharged. a bidirectional power conversion module that converts to and regenerates the AC power; and a single processor for controlling the solar module and the bidirectional power conversion module.

The photovoltaic module according to an embodiment of the present invention is connected to the bidirectional power conversion module, and converts the photovoltaic voltage to DC/DC so as to be provided to the capacitive desalination module and converts the voltage to the boosted voltage of the bidirectional power conversion module can be provided to

According to an embodiment of the present invention, the solar module may include a seventh upper switch, a seventh lower switch connected in series with the seventh upper switch, and an inductor.

The solar module according to an embodiment of the present invention may provide the boosted voltage to the bidirectional power conversion module, and preferably boost the solar voltage and supply it to the DC link capacitor.

A single processor according to an embodiment of the present invention calculates an error between the current command value, the current designated value and the actual current measurement value through the MPPT algorithm from the actual voltage and actual current measurement values of the solar module, and the calculated The seventh upper switch and the seventh lower switch may be complementarily switched to output maximum power according to an error.

According to one embodiment of the present invention, by using the solar module integrated in the capacitive desalination module, the reliability of the system can be increased and the overall system price can be saved, and the solar module associated with the capacitive desalination module through a single processor And by controlling the bidirectional power conversion module, the power conversion process can be simplified to prevent power loss and consequent cost loss, and reduce environmental costs due to energy recycling.

In addition, according to one embodiment of the present invention, there is an advantage in that the power efficiency can be increased by converting the DC voltage at both ends of the capacitive desalination module into an AC voltage in the water discharge mode and regenerating it into an AC power source to recover energy.

1 is a block diagram of a photovoltaic module-linked power conversion system of a capacitive desalination module according to an embodiment of the present invention.
2 is a conceptual diagram for explaining the operation of the capacitive desalination module according to an embodiment of the present invention.
3A is a circuit diagram of a bidirectional power conversion module included in a solar module-linked power conversion system of a capacitive desalination module according to an embodiment of the present invention.
3B is a circuit diagram of a bidirectional power conversion module included in a photovoltaic module-linked power conversion system of a capacitive desalination module and a photovoltaic module connected thereto according to an embodiment of the present invention.
4A to 4C are block diagrams of a single processor included in a solar module-linked power conversion system of a capacitive desalination module according to an embodiment of the present invention.
5 shows a control mode of the capacitive desalination module according to an embodiment of the present invention.
6 is a waveform diagram of a water purification mode of an energy regeneration device using a capacitive desalination module according to an embodiment of the present invention.
7 is a waveform diagram of a drain mode of an energy regeneration device using a capacitive desalination module according to an embodiment of the present invention.
8A is a diagram illustrating a current flow in a water purification mode of a capacitive desalination module according to an embodiment of the present invention.
8B is a diagram illustrating a current flow in a drain mode of a capacitive desalination module according to an embodiment of the present invention.
9 is a flowchart illustrating an energy regeneration method using a photovoltaic module-linked power conversion system of a capacitive desalination module according to an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the embodiment of the present invention may be modified in various other forms, and the scope of the present invention is not limited only to the embodiments described below. The shapes and sizes of elements in the drawings may be exaggerated for a clearer description, and elements indicated by the same reference numerals in the drawings are the same elements.

1 is a block diagram of a photovoltaic module-linked power conversion system 100 of a capacitive desalination module according to an embodiment of the present invention.

First, as shown in Figure 1, the solar module-linked power conversion system 100 of the capacitive desalination module according to an embodiment of the present invention, the capacitive desalination module 120 and the ionic material in the raw water A bidirectional power conversion module 110 for applying purified power and drain power to the capacitive desalination module 120 to remove it, and a photovoltaic module 130 for supplying power by sunlight to the capacitive desalination module; It may include a single processor 140 controlling the solar module 130 and the bidirectional power conversion module 110 .

In particular, according to an embodiment of the present invention, the above-described bidirectional power conversion module 110 converts the DC voltage of both ends 120 of the capacitive desalination module into an AC voltage in the drain mode to convert the AC power supply 10 (that is, the grid power) , Grid) can be regenerated.

On the other hand, Figure 2 is a conceptual diagram for explaining the operation of the capacitive desalination module 120 shown in Figure 1 described above.

In the capacitive deionization module (CDI) 120 , ionic materials are moved and adsorbed to the electrode surface by an adsorption reaction in the electric double layer formed on the electrode surface when a potential is applied to the electrode, and the adsorption capacity of the electrode When this limit is reached, the electrode is regenerated by discharging the charged electrode and desorbing the ionic material.

Specifically, first, in the water purification mode, as shown in FIG. 2A , when a positive potential is applied to the positive electrode 121a and a negative potential is applied to the negative electrode 121b, the negative ions 122 in the raw water W1 are the positive electrode At 121a, the positive ions 123 in the raw water W1 are adsorbed to the negative electrode 121b (referred to as 'ion adsorption reaction').

Then, in the withdrawal mode, as shown in (b) of FIG. 2 , a negative potential is applied to the positive electrode 121a and a positive potential is applied to the negative electrode 121b, or the electrodes 121a and 121b are short-circuited. At this time, the electrode ( The ionic materials adsorbed to 121a and 121b are desorbed from the electrodes 121a and 121b (referred to as 'ion desorption reaction').

Thereafter, as shown in (c) of FIG. 2, the concentrated water W2 containing ionic substances may be discharged to the outside.

In the present invention, instead of short-circuiting the electrodes 121a and 121b during the above-described ion desorption reaction, the DC voltage by the charged electrodes 121a and 121b of the capacitive desalination module 120 is regenerated into the AC power supply 10. characterized.

Separately, a polarity conversion module (see 330 in FIG. 3, to be described later) is placed to convert the polarity of the DC voltage of the DC link capacitor (refer to 320 in FIG. 3, to be described later) in the withdrawal mode to the capacitive desalination module 120 Of course, it is also possible to completely remove the residual ions attached to the capacitive desalination module 120 by providing.

3A is a circuit diagram of the bidirectional power conversion module 110 included in the solar module-linked power conversion system 100 of the capacitive desalination module according to an embodiment of the present invention.

The above-described bidirectional power conversion module 110 supplies the purified power converted from the AC voltage supplied from the AC power supply 10 to a DC voltage to the capacitive desalination module 120 in the water purification mode, and in the evacuation mode, capacitive desalination The drain power obtained by converting the DC voltage at both ends of the module 120 into the AC voltage may be regenerated into the AC power supply 10 .

Specifically, as shown in FIG. 3A , the bidirectional power conversion module 110 includes a first module 311 for forming an insulation transformer 312 and a primary side voltage Vpri of the insulation transformer 312 and , is disposed between the second module 313 and the second module 313 and the capacitive desalination module (see 120 in FIG. 1) for forming the secondary side voltage (Vsec) of the insulation transformer 312 to obtain a DC voltage It may be configured to include a DC link capacitor 320 to store. The circuit 310 including the first module 311 , the isolation transformer 312 , and the second module 313 is a main module.

The above-described first module 311 includes a pair of upper switches T1 and T2 composed of a first upper switch T1 and a second upper switch T2, and a pair of upper switches T1 and T2 and It may include a pair of lower switches B1 and B2 including the first lower switch B1 and the second lower switch B2 connected in series, and two voltage division capacitors C1 and C2.

Meanwhile, the second module 313 has a full-bridge structure including first legs T3 and B3 and second legs T4 and B4 connected in parallel, and the first legs T3 and B3 are third connected in series. It may include an upper switch T3 and a third lower switch B3, and the second legs T4 and B4 may include a fourth upper switch T4 and a fourth lower switch B4 connected in series.

On the other hand, the polarity conversion module 330 has a full-bridge structure including a third leg (T5, B5) and a fourth leg (T6, B6) connected in parallel, the third leg (T5, B5) is a fifth upper part connected in series It is composed of a switch T5 and a fifth lower switch B5, and the fourth legs T6 and B6 are composed of a sixth upper switch T6 and a sixth lower switch B6 connected in series, and the power storage in the drain mode In order to remove residual ions attached to the type desalination module 120 , the polarity of the DC voltage of the DC link capacitor 320 may be changed and provided to the capacitive desalination module 120 .

On the other hand, undescribed reference numeral 340 is an L-C filter composed of an inductor (L) and a capacitor (C), CT2 is a current sensor that measures the current (Io) flowing to the capacitive desalination module 120, CT1 is an AC power source It is a current sensor that measures the current (Is) flowing in (10), SPD (Serge Protection Device) is a surge protection device, GRID FUSE is a fuse that prevents overcurrent, RY_GRID is a kind of relay, CO is a capacitor at the input terminal, and , ACL means the inductor of the input stage.

Meanwhile, FIG. 3B is a circuit diagram of the solar module 130 connected in parallel to the DC link capacitor 320 according to an embodiment of the present invention.

The solar module 130 includes a boost converter, boosts the voltage of the solar module and supplies it to the DC link capacitor 320, and the bidirectional power conversion module 110 uses AC power ( When the AC voltage supplied from 10) is converted into a DC voltage to supply purified power to the capacitive desalination module 120 , the boosted voltage of the solar module may be provided to the capacitive desalination module 120 as well.

As shown in Figure 3b, the solar module 130 is a seventh upper switch (T7), a seventh lower switch (B7) connected in series with the seventh upper switch (T7), a seventh upper switch (T7) and Consists of an inductor that charges the power while the seventh lower switch B7 is off, and boosts the voltage of the solar module 130 while the seventh upper switch T7 and the seventh lower switch B7 are complementarily controlled And, through this, the boosted voltage can be provided to the capacitive desalination module 120 so that the bidirectional power conversion module 110 and grid connection are possible.

On the other hand, Figures 4a to 4c is a block diagram of a single processor 140 included in the solar module-linked power conversion system 100 of the capacitive desalination module according to an embodiment of the present invention, the bidirectional power conversion module 110 ) and to control the solar module 130 .

According to an embodiment of the present invention, as shown in FIGS. 1, 3B and 4A , a single processor 140 boosts the voltage of the solar module 130 to supply it to the DC link capacitor 320 . The solar module 130 may be further controlled, and for this purpose, a single processor 140 may be configured as shown in FIG. 4A .

Specifically, the single processor 140 calculates the current command value (Ipv*) having the maximum power, the actual voltage and actual current measurement values (Vpv, Ipv) of the solar module received through the MPPT module 401 From the current command value (Ipv*) can be calculated. The MPPT module 401 is a module for performing a Maximum Power Point Tracking (MPPT) algorithm, and may use a method for tracking maximum power, such as a Perturb and Observe (P&O) method, and is not limited thereto.

The error calculator 402 may calculate an error between the command current Ipv* output from the MPPT module 401 and the actual current measured value Ipv.

The current controller 403 may control the current by the error, and the switching signals ST7 and SB7 for controlling the duty ratios of the seventh upper switch T7 and the seventh lower switch B7 through current control. ) to control the switch on-off time.

The single processor 140 may complementarily switch the seventh upper switch T7 and the seventh lower switch B7 of the solar module 130 through the above configuration. Only the duty ratio of the seventh lower switch B7 may be controlled through the current controller 413 and the seventh upper switch T7 may be turned off, but the seventh upper switch T7 and the seventh lower switch B7 may be turned off. Complementary switching can increase power efficiency through synchronous rectification.

On the other hand, as shown in Figures 1, 3a and 4b, the single processor 140 in the integer mode, the phase of the primary voltage (Vpri) of the isolation transformer 312 in the secondary voltage (Vsec) phase Controls the bidirectional power conversion module 110 to advance by a more preset phase difference (Phase Shift, PS), and in the withdrawal mode, the phase of the secondary voltage (Vsec) of the insulation transformer 312 is the primary voltage (Vpri) It is possible to control the bidirectional power conversion module 110 to advance by a preset phase difference (PS) than the phase. The above-described phase difference PS may also be referred to as an 'outer leg phase shift'.

Here, the preset phase difference may be determined according to Equation 1 below.

[Equation 1]

Here, PS is a preset phase difference, Vs ^* is a command value of the AC voltage (Vs), Ts is a switching period, n is a turn ratio of the insulation transformer 312 , and Vdc may be a voltage level of the DC link capacitor 320 .

For this purpose, a single processor 140 may be configured as shown in FIG. 4B .

Specifically, the PI controller 404 receives an error signal between the command value (Vdc*) of the DC voltage stored in the DC link capacitor 320 output from the error calculator 407 and the actual DC voltage (Vdc) and receives the current of the active power. You can print the size (Id ^* ). At this time, when the DC voltage command value (Vdc*) stored in the DC link capacitor 320 is greater than or equal to the peak value of the grid voltage, the DC voltage command value (Vdc*) is output from the MPPT module 401 for grid transmission. It can be set higher than (Vpv*).

The multiplier 406 multiplies the value obtained by multiplying the phase of the AC voltage Vs obtained through the PLL (Place Locked Loop) 405 by the sine function (sin wt) and the current magnitude (Id ^* ) obtained above to obtain the command value of the AC current ( Is ^* ) can be obtained.

The error calculator 407 may calculate an error between the command value Is ^* of the AC current output from the multiplier 406 and the actual AC current Is.

The error between the command value Is ^* of the AC current and the actual AC current Is may be converted into a command value Vs ^* of the AC power supply through the proportional resonance controller PR 408 .

Thereafter, the command value Vs ^* of the AC power is input to the phase difference calculating unit 409 , and the phase difference calculating unit 409 may calculate the phase difference PS by Equation 1 described above.

On the other hand, in the switching logic 410, the switches T1, B1, T2, B2 of the first module 311 of the bidirectional power conversion module 110 based on the signs of the phase difference PS and the AC power Vs obtained above. ) for switching the switching signals ST1, SB1, ST2, SB2 and the switching signals ST3, SB3, ST4, SB4 for switching the switches T3, B3, T4, and B4 of the second module 313 ) can be created. The logic for generating the switching signals ST1, SB1, ST2, SB2, ST3, SB3, ST4, SB4 can be implemented in various ways as long as it can be controlled to operate as in Equation 1 and the following (the simplest (may be implemented using a timer based on the ST1 signal), a detailed description thereof will be omitted in the present invention.

Specifically, the single processor 140 operates the first upper switch T1 and the first lower switch B1, and the second upper switch T2 and the second lower switch B2 of the first module 311 . Complementarily switching, the third upper switch (T3) and the third lower switch (B3) constituting the first legs (T3, B3) of the second module 313, and the second legs (T4, B4) The fourth upper switch (T4) and the fourth lower switch (B4) constituting it may be complementary switched.

In addition, in the present invention, the phase of the switching signal of the third upper switch (T3) and the third lower switch (B3) constituting the first leg (T3, B3) and the fourth constituting the second leg (T4, B4) The phase difference between the phases of the switching signals of the upper switch T4 and the fourth lower switch B4 (referred to as 'inner leg phase shift') has a value of 1/2 of the phase difference PS obtained above. can be switched to

In addition, as shown in Fig. 4c, the mode selection switch 413 receives an error between the current (Io) and the current command value (Io ^* ) flowing in the capacitive desalination module 120 for the current mode or selects the voltage mode. For this purpose, an error between the DC voltage Vo and the DC voltage command value Vo ^* of the capacitive desalination module 120 may be selectively input.

Accordingly, when the mode selection switch 413 determines the current mode (CC(+), CC(-)) and the voltage mode (CV) according to the received error, as shown in FIG. 5 below, the current controller ( 414) can control the current according to the determined mode, and the switching logic 415 also switches the switches T5, B5, T6, B6 of the polarity conversion module 330 according to the determined mode. ST5, SB5, ST6, SB6) can be created. The logic for generating the switching signals ST5, SB5, ST6, SB6 can be implemented in various ways as long as it can be controlled to operate as shown in FIGS. 8A and 8B (the simplest is using a timer based on the ST5 signal) may be implemented), a detailed description thereof will be omitted in the present invention.

On the other hand, Figure 5 shows a control mode of the capacitive desalination module according to an embodiment of the present invention.

As shown in FIG. 5 , the control mode according to an embodiment of the present invention may be divided into a current mode (CC(+), CC(-)) and a voltage mode (CV) to be controlled. In the current mode, CC(+) is a mode in which the load current (Io) is (+) and energy is supplied from the AC power supply (Vs) to the capacitive desalination module 120. In the current control mode, CC(-) is the load current (Io) may be a mode in which energy is regenerated from the capacitive desalination module 120 to the AC power source (Vs) as (-).

That is, the single processor 140 controls the bidirectional power conversion module 110 in the current mode (CC(+)) so that a constant direct current (Io) is provided to the water purification mode capacitive desalination module 120, but the capacitive type When the voltage Vo at both ends of the desalination module 120 reaches the target voltage, it is controlled in the voltage mode (CV) so that a constant DC voltage is applied to the capacitive desalination module 120, and in the drain mode, the capacitive desalination module 120 ) to output a constant direct current (Io) from the bidirectional power conversion module 110 can be controlled in the current mode (CC(-)).

On the other hand, Figure 6 is a waveform diagram of the water purification mode of the integrated operation system of the capacitive desalination module according to an embodiment of the present invention, (a) is the primary side voltage (Vpri) waveform of the insulation transformer, the secondary side of the insulation transformer Voltage (Vsec) waveform, IL is the current waveform flowing to the primary side of the insulation transformer, (b) is the switching of the switches (T1, T2, B1, B2) when the sign of the AC voltage (Vs) is (+) Waveforms of the signals ST1, ST2, SB1, SB2, (c) is the switching signal ST1, ST2, of the switches T1, T2, B1, B2 when the sign of the AC voltage Vs is (-) Waveforms of SB1 and SB2, (d) is the switching signals ST3, SB3, ST4, and SB4 for the switches T3, B3, T4, and B4. In FIG. 6, a switching signal is generated in consideration of the dead time.

6, the single processor 140 controls the switching signals ST1, ST2, SB1, SB2 of the switches T1, T2, B1, B2 according to the sign of the AC voltage Vs, When power is supplied from the AC power supply 10 to the capacitive desalination module 120, that is, in the water purification mode, the phase of the primary voltage (Vpri) of the insulation transformer is a preset phase difference (PS) from the phase of the secondary voltage (Vsec) ), it can be seen that it is switched to advance by

On the other hand, Figure 7 is a waveform diagram of the discharge mode of the integrated operation system of the capacitive desalination module according to an embodiment of the present invention, (a) is a primary side voltage (Vpri) waveform of the insulation transformer, the secondary side of the insulation transformer Voltage (Vsec) waveform, IL is the current waveform flowing to the primary side of the insulation transformer, (b) is the switching of the switches (T1, T2, B1, B2) when the sign of the AC voltage (Vs) is (+) Waveforms of the signals ST1, ST2, SB1, SB2, (c) is the switching signal ST1, ST2, of the switches T1, T2, B1, B2 when the sign of the AC voltage Vs is (-) Waveforms of SB1 and SB2, (d) is the switching signals ST3, SB3, ST4, and SB4 for the switches T3, B3, T4, and B4. In FIG. 7, a switching signal is generated in consideration of the dead time.

7, the single processor 140 controls the switching signals ST1, ST2, SB1, SB2 of the switches T1, T2, B1, B2 according to the sign of the AC voltage Vs, When power is supplied from the AC power supply 10 to the capacitive desalination module 120, that is, in the withdrawal mode, the phase of the secondary voltage (Vsec) of the insulation transformer is a preset phase difference (PS) than the phase of the primary voltage (Vpri) ), it can be seen that it is switched to advance by

Finally, Figure 8a shows a current flow diagram of the polarity conversion module 330 in the water purification mode of the capacitive desalination module 120 according to an embodiment of the present invention, Figure 8b is according to an embodiment of the present invention It is a view showing a current flow diagram of the polarity conversion module 330 in the withdrawal mode of the capacitive desalination module.

As shown in FIG. 8A , when the capacitive desalination module 120 performs the water purification mode, the switching logic 415 shown in FIG. 4C is the third leg (T5, B5) in the polarity conversion module 330 of the fifth upper switch T5 generates a switching signal ST5 that is always ON, and complementarily controls the sixth upper switch T6 and the sixth lower switch B6 of the fourth legs T6 and B6. to generate the switching signals ST6 and SB6. It operates similarly to battery charging operation.

On the other hand, as shown in Fig. 8b, when the capacitive desalination module 120 performs the evacuation mode, the switching logic 415 shown in Fig. 4c is, in the polarity conversion module 330, the fourth leg T6, The sixth lower switch B6 of B6 generates a switching signal SB6 that is always ON, and complements the fifth upper switch T5 and the fifth lower switch B5 of the third legs T5 and B5. The switching signals ST5 and SB5 may be generated to control the . It operates similarly to battery discharge operation.

As described above, according to one embodiment of the present invention, by using the solar system integrated in the capacitive desalination module, the reliability of the system can be increased and the overall system price can be saved, and the capacitive desalination module and the capacitive desalination module through a single processor By controlling the associated photovoltaic module and the bidirectional power conversion module, the power conversion process can be simplified, thereby preventing power loss and consequent cost loss, and reducing environmental costs due to energy recycling.

In addition, according to one embodiment of the present invention, there is an advantage in that the power efficiency can be increased by converting the DC voltage at both ends of the capacitive desalination module into an AC voltage in the water discharge mode and regenerating it into an AC power source to recover energy.

Meanwhile, FIG. 9 is a flowchart illustrating an energy regeneration method using a solar module-linked power conversion system of a capacitive desalination module according to an embodiment of the present invention.

Hereinafter, an energy regeneration method using the solar module-linked power conversion system of the capacitive desalination module will be described with reference to FIGS. 1 to 9 . However, for the sake of simplification of the invention, descriptions of overlapping parts with respect to FIGS. 1 to 8B will be omitted.

1 to 9, the energy regeneration method using the solar module-linked power conversion system of the capacitive desalination module according to an embodiment of the present invention,

In the bidirectional power conversion module 110, it may be initiated by converting the AC voltage supplied from the AC power supply 10 to a DC voltage at the time of purification and supplying the AC voltage to the capacitive desalination module 120 (S901).

At this time, the voltage applied by DC/DC conversion from the solar module 130 is provided to the DC link capacitor 320 in which the voltage obtained by converting the AC voltage supplied from the AC power supply 10 into a DC voltage is stored, so that the capacitor type It may be supplied to the desalination module 120 .

Next, the bidirectional power conversion module 110 may convert the DC voltage at both ends of the capacitive desalination module 120 into an AC voltage when the water is discharged to be regenerated into the AC power supply 10 ( S902 ).

The above-described bi-directional power conversion module 110, the bi-directional power conversion module 110 is an insulation transformer 312, and a first module 311 for forming the primary-side voltage (Vpri) of the insulation transformer 312 and , is disposed between the second module 313 and the second module 313 and the capacitive desalination module (see 120 in FIG. 1) for forming the secondary side voltage (Vsec) of the insulation transformer 312 to obtain a DC voltage It may be configured to include the DC link capacitor 320 to store as described above.

In addition, according to one embodiment of the present invention, the single processor 140 has a preset phase difference ( Controls the bidirectional power conversion module 110 to lead by as much as Phase Shift, PS), and in the withdrawal mode, the phase of the secondary voltage (Vsec) of the insulation transformer 312 is a preset phase difference than the phase of the primary voltage (Vpri) As described above, it is possible to control the bidirectional power conversion module 110 to advance by (PS).

As described above, according to one embodiment of the present invention, by controlling the photovoltaic module and the bidirectional power conversion module of the capacitive desalination module through a single processor, communication abnormality is prevented, and the reliability of the system is increased, and the By preventing delay, etc., control responsiveness can be improved.

In addition, according to one embodiment of the present invention, by using the solar module integrated in the capacitive desalination module, the reliability of the system can be increased and the overall system price can be saved, and the power conversion process is simplified so that the power loss and consequent cost loss can be prevented, and environmental costs due to energy recycling can be reduced.

In addition, according to one embodiment of the present invention, there is an advantage in that the power efficiency can be increased by converting the DC voltage at both ends of the capacitive desalination module into an AC voltage in the water discharge mode and regenerating it into an AC power source to recover energy.

The energy regeneration method using the solar module-linked power conversion system of the capacitive desalination module according to the embodiment of the present invention described above may be produced as a program to be executed in a computer and stored in a computer-readable recording medium. Examples of the computer-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like. In addition, the computer-readable recording medium is distributed in a computer system connected to a network, so that the computer-readable code can be stored and executed in a distributed manner. And a functional program, code, and code segments for implementing the method can be easily inferred by programmers in the art to which the present invention pertains.

In addition, in describing the present invention, 'processor' is used in various ways, for example, a processor, program instructions executed by the processor, software module, microcode, computer program product, logic circuit, application-specific integrated circuit, firmware, etc. can be implemented by

The present invention is not limited by the above-described embodiments and the accompanying drawings. It is intended to limit the scope of rights by the appended claims, and it is to those of ordinary skill in the art that various types of substitutions, modifications and changes can be made without departing from the technical spirit of the present invention described in the claims. it will be self-evident

10: AC power, 110: bidirectional power conversion module
120: CDI module, 121a: positive electrode
121b: negative electrode, 122: negative ion
123: positive ion, 130: solar module
140: single processor;
310: main module, 311: first module
312: isolation transformer, 313: second module
320: DC link capacitor, 330: polarity conversion module
340: LC filter, 401: MPPT module,
402: error calculator, 403: current controller;
404: PI controller, 405: PLL,
406: multiplier, 407: error calculator;
408: proportional resonance controller, 409: phase difference calculating unit,
410: switching logic, 411, 412: error calculator;
413: mode selection switch, 414: current controller;
415: switching logic

Claims (15)

Capacitive desalination module;
a solar module for supplying power by sunlight to the capacitive desalination module;
The DC voltage converted from the AC voltage supplied from the AC power source during water purification and the DC voltage supplied from the solar module are supplied to the capacitive desalination module, and the DC voltage at both ends of the capacitive desalination module is converted to AC voltage when water is discharged. a bidirectional power conversion module that converts to and regenerates the AC power; and
Includes; a single processor for controlling the solar module and the bidirectional power conversion module,
The bidirectional power conversion module,
In the water purification mode, the purified water converted from the AC voltage supplied from the AC power supply to the DC voltage is supplied to the capacitive desalination module.
Regenerating the evacuation power that converts the DC voltage at both ends of the capacitive desalination module into AC voltage into the AC power in the evacuation mode,
The single processor,
In the water purification mode, the bidirectional power conversion module is controlled in the current mode so that a constant DC current is provided to the capacitive desalination module, and when the voltage at both ends of the capacitive desalination module reaches a target voltage, the capacitive desalination module is constant Control in voltage mode so that DC voltage is applied,
A solar-linked power conversion system of a capacitive desalination module for controlling the bi-directional power conversion module in a current mode so that a constant direct current is output from the capacitive desalination module in a drain mode.
According to claim 1,
The photovoltaic module is connected to the bidirectional power conversion module, and provides a voltage boosted by DC/DC conversion of a solar voltage to the bidirectional power conversion module so as to be provided to the capacitive desalination module, a capacitive desalination module of solar power conversion system.
delete According to claim 1,
The bidirectional power conversion module,
Isolation transformer;
a first module for forming a primary voltage of the insulation transformer;
a second module for forming a secondary-side voltage of the insulation transformer; and
a DC link capacitor disposed between the second module and the capacitive desalination module to store a DC voltage;
Including, a solar-linked power conversion system of the capacitive desalination module.
Capacitive desalination module;
a solar module for supplying power by sunlight to the capacitive desalination module;
The DC voltage converted from the AC voltage supplied from the AC power source during water purification and the DC voltage supplied from the solar module are supplied to the capacitive desalination module, and the DC voltage at both ends of the capacitive desalination module is converted to AC voltage when water is discharged. a bidirectional power conversion module that converts to and regenerates the AC power; and
Includes; a single processor for controlling the solar module and the bidirectional power conversion module,
The bidirectional power conversion module,
Isolation transformer;
a first module for forming a primary voltage of the insulation transformer;
a second module for forming a secondary-side voltage of the insulation transformer; and
a DC link capacitor disposed between the second module and the capacitive desalination module to store a DC voltage;
The first module includes a pair of upper switches including a first upper switch and a second upper switch, and a pair of lower switches including a first lower switch and a second lower switch connected in series with the pair of upper switches; , consisting of two voltage division capacitors,
The second module has a full-bridge structure including a first leg and a second leg connected in parallel, wherein the first leg is composed of a third upper switch and a third lower switch connected in series, and the second leg is connected in series Consisting of a fourth upper switch and a fourth lower switch, a solar-linked power conversion system of a capacitive desalination module.
3. The method of claim 2,
The solar module includes a seventh upper switch, a seventh lower switch connected in series with the seventh upper switch, and an inductor, a solar-linked power conversion system for a capacitive desalination module.
5. The method of claim 4,
The solar module boosts the solar voltage and supplies it to the DC link capacitor, a solar-linked power conversion system for a capacitive desalination module.
7. The method of claim 6,
The single processor,
Calculate the current command value and the error between the current command value and the actual current measurement value through the MPPT algorithm from the actual voltage and actual current measurement values of the solar module,
Complementarily switching the seventh upper switch and the seventh lower switch to output maximum power according to the calculated error, a solar-linked power conversion system for a capacitive desalination module.
5. The method of claim 4,
The single processor,
In the integer mode, controlling the bidirectional power conversion module so that the phase of the primary voltage of the insulation transformer is ahead by a preset phase difference (PS) than the phase of the secondary voltage,
In the withdrawal mode, the phase of the secondary voltage of the insulation transformer is ahead of the phase of the primary voltage by a preset phase difference (PS) to control the bi-directional power conversion module, the capacitive desalination module solar-linked power conversion system .
10. The method of claim 9,
The preset phase difference PS is,
Equation:

where Vs ^* is the command value of the AC voltage, Ts is the switching period, n is the turn ratio of the insulation transformer, and Vdc is the voltage level of the DC link capacitor, the solar-linked power conversion system of the capacitive desalination module .
Capacitive desalination module;
a solar module for supplying power by sunlight to the capacitive desalination module;
The DC voltage converted from the AC voltage supplied from the AC power source during water purification and the DC voltage supplied from the solar module are supplied to the capacitive desalination module, and the DC voltage at both ends of the capacitive desalination module is converted to AC voltage when water is discharged. a bidirectional power conversion module that converts to and regenerates the AC power; and
Includes; a single processor for controlling the solar module and the bidirectional power conversion module,
The bidirectional power conversion module,
Isolation transformer;
a first module for forming a primary voltage of the insulation transformer;
a second module for forming a secondary-side voltage of the insulation transformer; and
a DC link capacitor disposed between the second module and the capacitive desalination module to store a DC voltage;
The single processor,
Complementarily switching the first upper switch and the first lower switch of the first module, and the second upper switch and the second lower switch,
Complementarily switching the third upper switch and the third lower switch constituting the first leg of the second module, and the fourth upper switch and the fourth lower switch constituting the second leg,
The phase difference between the phases of the switching signals of the third upper switch and the third lower switch constituting the first leg and the phases of the switching signals of the fourth upper switch and the fourth lower switch constituting the second leg,
Having a value of 1/2 of the preset phase difference (PS), the solar-linked power conversion system of the capacitive desalination module.
5. The method of claim 4,
The solar-linked power conversion system of the capacitive desalination module,
a polarity conversion module that converts the polarity of the DC voltage of the DC link capacitor to remove the residual ions attached to the capacitive desalination module in the evacuation mode and provides it to the capacitive desalination module;
Further comprising, a solar-linked power conversion system of the capacitive desalination module.
delete A capacitive desalination module, a photovoltaic module for supplying power by sunlight to the capacitive desalination module, and bidirectional power for applying purified water and drain power to the capacitive desalination module to remove ionic substances in raw water In the energy regeneration method of a solar-linked power conversion system of a capacitive desalination module including a conversion module,
a first step of converting an AC voltage supplied from an AC power source into a DC voltage during water purification and supplying it to the capacitive desalination module; and
A second step of converting the DC voltage at both ends of the capacitive desalination module into an AC voltage and regenerating the DC voltage into the AC power when the water is discharged.
The first step is to supply the purified power that converts the AC voltage supplied from the AC power to the DC voltage in the water purification mode to the capacitive desalination module, and the bidirectional power conversion module to provide a constant DC current to the capacitive desalination module Control in current mode, but control in voltage mode so that a constant DC voltage is applied to the capacitive desalination module when the voltage at both ends of the capacitive desalination module reaches a target voltage,
The second step is to regenerate the drain power that converts the DC voltage at both ends of the capacitive desalination module into the AC voltage in the drain mode to the AC power source, and the bidirectional power conversion module so that a constant DC current is output from the capacitive desalination module An energy regeneration method using a photovoltaic-linked power conversion system of a capacitive desalination module that controls in a current mode.
A computer-readable recording medium recording a program for executing the method of claim 14 on a computer.

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