KR102412053B1 - Integrated operating system for capacitive deionization module, method thereof and computer readable medium - Google Patents

Abstract

An integrated operation system for a capacitive desalination module, a control method thereof, and a computer-readable recording medium are provided. The integrated operation system of the capacitive desalination module provides raw water to the capacitive desalination module and the capacitive desalination module, and concentrates the production water from which ionic substances are removed by the capacitive desalination module or concentration containing the removed ionic substances. Surrounding facilities that receive and store water, a bidirectional power conversion module that applies purified power and water discharge power to the capacitive desalination module to remove ionic substances in raw water, and a single unit that controls the surrounding facilities and the bidirectional power conversion module It may include a processor.

Description

Integrated operation system for capacitive desalination module, its control method, and computer-readable recording medium

The present application relates to an integrated operation system of a capacitive desalination module, a control method thereof, 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 such, the electro-adsorption 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, the 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.

In addition, the system including the existing capacitive desalination module receives AC power from the grid and converts it to DC power, and since DC/DC power conversion is performed again to match the electrical insulation and voltage size, it is possible to control the power conversion. The processor and the peripheral equipment of the capacitive desalination module, for example, a transfer pump, and a processor for controlling various valves or sensors are configured separately.

Therefore, since two types of processors must be used, the price of the entire system rises, and since commands must be exchanged between processors through separate communication, the reliability of the system decreases when communication abnormalities occur, and control response due to delay between signals, etc. There is a problem with the sexuality dropping.

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

The present invention provides an integrated operation system for a capacitive desalination module capable of increasing system reliability by preventing communication abnormalities, improving control responsiveness by preventing a delay between signals, etc. and increasing power efficiency, and a control method thereof and a computer-readable recording medium.

According to an embodiment of the present invention, a capacitive desalination module; a peripheral facility for providing raw water to the capacitive desalination module, and receiving and storing the production water from which the ionic material has been removed by the capacitive desalination module or the concentrated water containing the removed ionic material; a bidirectional power conversion module for applying purified water power and waste water power to the capacitive desalination module to remove ionic substances in the raw water; and a single processor for controlling the peripheral equipment and the bidirectional power conversion module;

According to one embodiment of the present invention, the capacitive desalination module, and the capacitive desalination module to provide raw water, and the capacitive desalination module, the ionic material is removed by the production water or the removed ionic material is included An integrated operation system of a capacitive desalination module comprising a peripheral facility for receiving and storing concentrated water, and a bidirectional power conversion module for applying purified water and wastewater power to the capacitive desalination module to remove ionic substances in raw water In the control method of , in the purified mode, the water valve of the peripheral equipment is opened while the transfer pump of the peripheral equipment is operated, and the water purification power is preset to the capacitive desalination module by controlling the bidirectional power conversion module. applying for a first application time; and in the water discharge mode, while closing the production water valve of the surrounding facility, opening the concentrated water valve of the surrounding facility, and controlling the bi-directional power conversion module to apply a preset second application of the water discharge power to the capacitive desalination module It provides a control method of the integrated operation system of the capacitive desalination module, including; applying for a period of time.

According to one embodiment of the present invention, there is provided a computer-readable recording medium in which a program for executing the method in a computer is recorded.

According to one embodiment of the present invention, by controlling the peripheral facilities of the capacitive desalination module and the bidirectional power conversion module through a single processor, communication abnormality is prevented, thereby increasing the reliability of the system, and controlling the delay between signals Responsiveness can be improved.

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 an integrated operation 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 an integrated operation system of a capacitive desalination module according to an embodiment of the present invention.
Figure 3b is a peripheral equipment included in the integrated operation system of the capacitive desalination module according to an embodiment of the present invention.
4 is a block diagram of a single processor included in the integrated operation system of the 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 voltage and current waveforms during operation by a conventional unidirectional power conversion device.
8B is a diagram illustrating voltage and current waveforms during operation by the bidirectional power conversion device according to an embodiment of the present invention.
9 is a flowchart illustrating a control method of an integrated operation 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 an integrated operation system 100 of a capacitive desalination module according to an embodiment of the present invention.

First, as shown in FIG. 1 , the integrated operation system 100 of the capacitive desalination module according to an embodiment of the present invention includes a capacitive desalination module 120 and a power storage to remove ionic substances in raw water. A bidirectional power conversion module 110 for applying purified power and drain power to the type desalination module 120, and a capacitive desalination module 120 to provide raw water, and the capacitive desalination module 120 to convert ionic substances A single processor 140 for controlling the peripheral equipment 130 and the peripheral equipment 130 and the bidirectional power conversion module 110 to receive and store the removed production water or concentrated water containing the removed ionic material. may include

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 integrated operation 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 312 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.

On the other hand, Figure 3b is a peripheral equipment included in the integrated operation system of the capacitive desalination module according to an embodiment of the present invention.

As shown in FIG. 3B , the peripheral equipment 130 includes a raw water storage tank 131 for storing raw water, and a transfer pump 132 for supplying raw water stored in the raw water storage tank 131 to the capacitive desalination module 120 . ), the production water storage tank 134 for receiving and storing the product water from which ionic substances have been removed from the raw water supplied to the capacitive desalination module 120, and the ionicity removed by the capacitive desalination module 120 A concentrated water storage tank 135 for receiving and storing concentrated water containing a substance, a production water valve V2 provided between the capacitive desalination module 120 and the production water storage tank, and a capacitive desalination module 120 ) and the concentrated water valve (V3) provided between the concentrated water storage tank may be included.

In addition, according to an embodiment of the present invention, the filter 133 and the capacitive desalination module 120 may further include a filter valve V1, the filter 133 and the capacitive desalination module 120, and Between the capacitive desalination module 120 and the production water storage tank 134, a flow measuring sensor (Flow Transmitter, FT) for measuring the flow rate of the flowing liquid, and a conductivity sensor for measuring the electrical conductivity of the liquid (ConducTivity sensor, CT) is further provided, and a conductivity sensor (CT) for measuring the electrical conductivity of the liquid may be further provided between the capacitive desalination module 120 and the concentrated water storage tank 135 .

Meanwhile, FIG. 4 is a block diagram of a single processor 140 included in the integrated operation system of the capacitive desalination module according to an embodiment of the present invention, for controlling the bidirectional power conversion module.

1, 3A and 4, the single processor 140 has a phase of the primary voltage (Vpri) of the isolation transformer 312 in the integer mode is higher than the phase of the secondary voltage (Vsec). Controls the bidirectional power conversion module 110 to advance by the set phase shift (PS), and in the withdrawal mode, the phase of the secondary voltage (Vsec) of the isolation transformer 312 is higher than the phase of the primary voltage (Vpri) It is possible to control the bidirectional power conversion module 110 to advance by a preset phase difference (PS). 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. 4 .

Specifically, the mode selection switch 403 receives an error between the current (Io) and the current command value (Io ^* ) flowing through the capacitive desalination module 120 for the current mode or the capacitive desalination module 120 for the voltage mode. ) between the DC voltage Vo and the DC voltage command value Vo ^* can be selectively input.

The PI controller 404 may receive a signal output from the mode selection switch 403 and output a current magnitude (Id ^* ) of the active power.

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 source through the proportional resonance controller PR.

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 ST31, SB31, ST4, SB4 for switching the switches T3, B3, T4, and B4 of the second module 313 can create The logic for generating the switching signals ST1, SB1, ST2, SB2, ST31, SB31, 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

Meanwhile, according to an embodiment of the present invention, the single processor 140 may further control the peripheral equipment shown in FIG. 3B .

Specifically, as shown in FIGS. 1 and 3B, a single processor 140, in the water purification mode, opens the production water valve V2 while operating the transfer pump 132, and operates the capacitive desalination module ( The purified water power may be applied to 120 ) for a preset first application time (in this case, the filter valve V1 is in an open state).

In addition, the single processor 140 closes the production water valve V2 and opens the concentrated water valve V3 in the water discharge mode, and applies a second preset water discharge power to the capacitive desalination module 120 . may be granted for a period of time.

In addition, the single processor 140 may be configured such that the accumulated flow rate (measured through the flow measurement sensor FT) exceeds a preset flow rate or the electrical conductivity of the raw water (electrical conductivity in the raw water storage tank 131) is too high. The capacitive desalination module 120 may be operated in the water purification mode under at least one condition of exceeding the set value.

Also, when the second application time elapses, the single processor 140 may close the concentrated water valve V3 and simultaneously turn off the power of the transfer pump 132 .

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, FIG. 8A is a diagram illustrating voltage and current waveforms during operation by a conventional unidirectional power conversion device, and FIG. 8B illustrates voltage and current waveforms during operation by a two-way power conversion device according to an embodiment of the present invention. it is one drawing

As shown in FIG. 8A, during operation by the existing one-way power conversion device, a short section exists and energy is transferred through a resistor to suppress the current fluctuation in the transient state between mode changes (from integer to drain or from drain to integer). Consume action is required. And, it can be seen that the product of voltage and current is always positive (+) whether it is an integer section or a drain section, so it is a section that consumes energy.

On the other hand, as shown in FIG. 8B , it can be seen that the product of the voltage and the current in the discharge section becomes negative (-) during operation by the bidirectional power conversion device according to the embodiment of the present invention, which is the power flows in the opposite direction. (that is, energy is recovered to the system) It can be seen that energy is supplied. And it can be seen that there is no current peak in the transient state between all transitions, and the transition is made smoothly.

As described above, according to one embodiment of the present invention, by controlling the peripheral facilities of the capacitive desalination module and the bidirectional power conversion module through a single processor, communication abnormality is prevented, and the reliability of the system is increased, and the delay between signals It is possible to increase the control responsiveness by preventing the

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 a control method of an integrated operation system of a capacitive desalination module according to an embodiment of the present invention.

Hereinafter, a control method of the integrated operation system of the capacitive desalination module according to an embodiment of the present invention 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 control method S900 of the integrated operation system according to an embodiment of the present invention is a capacitive type according to the flow rate Qt and the electrical conductivity TDS accumulated in the single processor 140 . The desalination module 120 may be controlled in a water purification mode or a water discharge mode.

Specifically, the single processor 140 determines whether the accumulated flow rate Qt exceeds a preset flow rate Qr (S901). The accumulated flow rate Qt may be measured by a flow sensor (see FT in FIG. 3B ).

As a result of the determination in step S901, if the accumulated flow rate Qt exceeds the preset flow rate Qr, the flow proceeds to step S902 to clean the capacitive desalination module 120, and as a result of the determination, the accumulated flow rate Qt is If it does not exceed the preset flow rate Qr, it may proceed to step S903.

In step S903, the single processor 140 may further determine whether the electrical conductivity (TDS) in the raw water storage tank 131 exceeds a preset electrical conductivity (TDSr). As a result of the determination, if the electrical conductivity (TDS) in the raw water storage tank 131 exceeds the preset electrical conductivity (TDSr), the process proceeds to step S904, and the electrical conductivity (TDS) in the raw water storage tank 131 is the preset electrical conductivity ( TDSr), the process may proceed to step S901. In the present invention, the electrical conductivity is determined according to the total dissolved solids (TDS), but considering that the total dissolved solids (TDS) and the electrical conductivity are not necessarily proportional to the components of the liquid, the electrical conductivity It should be noted that it may mean only conductivity.

Steps S904 to S907 represent the operation in the water purification mode, and steps S908 to S912 represent the operation in the water drain mode.

In the water purification mode, the single processor 140 opens the production water valve V2 of the peripheral equipment 130 (S904), while operating the transfer pump 132 of the peripheral equipment 130 (S905), bidirectional power By controlling the conversion module 110, purified power may be applied to the capacitive desalination module 110 during a preset first application time TR1 (S906 to S907). Thereafter, when the preset first application time TR1 elapses, the following water withdrawal mode may be performed.

In the drain mode, the single processor 140 closes the production water valve V2 of the peripheral equipment 130 while opening the concentrated water valve V3 of the peripheral equipment 130 (S908), and the bidirectional power conversion module ( 110) to apply the drain power to the capacitive desalination module 120 for a preset second application time TR2 (S909 to S910). Thereafter, when the preset second application time TR2 has elapsed, the concentrated water valve may be opened (S911), and the power of the transfer pump may be turned off (S912).

As described above, the bidirectional power conversion module 110 can convert the DC voltage at both ends of the capacitive desalination module 120 into an AC voltage and regenerate it into the AC power supply 10 in the drain mode, as described above, and the bidirectional power conversion The module 110 includes a transformer for insulation 312 and a first module 311 forming a primary-side voltage (Vpri) of the transformer for insulation 312, and a secondary-side voltage (Vsec) of the transformer for insulation 312 A second module 313 forming a, and a DC link capacitor 320 disposed between the second module 313 and the capacitive desalination module (see 120 in FIG. 1 ) to store a DC voltage. It is the same 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 peripheral facilities of the capacitive desalination module and the bidirectional power conversion module through a single processor, communication abnormality is prevented, and the reliability of the system is increased, and the delay between signals It is possible to increase the control responsiveness by preventing the

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 method for controlling the integrated operation 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 by 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 through 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: cation 130: peripheral equipment
131: raw water storage tank 132: transfer pump
133: filter 134: production water storage tank
135: concentrated water storage tank 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, 402: error calculator
403: mode select switch 404: PI controller
405: PLL 406: multiplier
407: error calculator 408: proportional resonance controller
409: phase difference calculator 410: switching logic

Claims (15)

Capacitive desalination module;
a peripheral facility for providing raw water to the capacitive desalination module, and receiving and storing the production water from which the ionic material has been removed by the capacitive desalination module or the concentrated water containing the removed ionic material;
a bidirectional power conversion module for applying purified water power and waste water power to the capacitive desalination module to remove ionic substances in the raw water; and
Includes; a single processor for controlling the peripheral equipment and the bidirectional power conversion module;
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 Controlled in voltage mode so that DC voltage is applied,
The integrated operation system of the capacitive desalination module, which controls the bidirectional power conversion module in the current mode so that a constant direct current is output from the capacitive desalination module in the water discharge mode.
According to claim 1,
The peripheral equipment is
raw water storage tank to store raw water;
a transfer pump for supplying raw water stored in the raw water storage tank to the capacitive desalination module;
a production water storage tank for receiving and storing production water from which ionic substances have been removed from the raw water supplied to the capacitive desalination module;
a concentrated water storage tank for receiving and storing concentrated water containing the ionic material removed by the capacitive desalination module;
a production water valve provided between the capacitive desalination module and the production water storage tank; and
a concentrated water valve provided between the capacitive desalination module and the concentrated water storage tank;
Including, the integrated operation system of the capacitive desalination module.
3. The method of claim 2,
The single processor,
In the water purification mode, the production water valve is opened while the transfer pump is operated, and the purified water power is applied to the capacitive desalination module for a preset first application time,
In the discharge mode, the integrated operation system of the capacitive desalination module, which closes the produced water valve while opening the concentrated water valve, and applies the discharge power to the capacitive desalination module for a second preset application time.
4. The method of claim 3,
The single processor,
Integrated operation of the capacitive desalination module, which operates the capacitive desalination module in the water purification mode under at least one of the case where the accumulated flow rate exceeds a preset flow rate or the electrical conductivity of the raw water exceeds a preset value system.
4. The method of claim 3,
The single processor,
When the second application time elapses, the concentrated water valve is closed and the power of the transfer pump is turned off at the same time.
According to claim 1,
The bidirectional power conversion module,
supplying the purified water power converted from the AC voltage supplied from the AC power source into a DC voltage to the capacitive desalination module in the water purification mode;
The integrated operation system of the capacitive desalination module for regenerating the evacuation power source obtained by converting the DC voltage at both ends of the capacitive desalination module into an AC voltage in the water discharge mode to the AC power source.
Capacitive desalination module;
a peripheral facility for providing raw water to the capacitive desalination module, and receiving and storing the production water from which the ionic material has been removed by the capacitive desalination module or the concentrated water containing the removed ionic material;
a bidirectional power conversion module for applying purified water power and waste water power to the capacitive desalination module to remove ionic substances in the raw water; and
Includes; a single processor for controlling the peripheral equipment 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 source into a DC voltage is supplied to the capacitive desalination module,
Regenerating the evacuation power, which converted the DC voltage at both ends of the capacitive desalination module into an AC voltage, into the AC power in the evacuation mode,
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, the integrated operation system of the capacitive desalination module.
8. The method of claim 7,
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 The integrated operation system of the capacitive desalination module, comprising a fourth upper switch and a fourth lower switch.
8. The method of claim 7,
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 water 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 bidirectional power conversion module, the integrated operation system of the capacitive desalination module.
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 isolation transformer, and Vdc is the voltage level of the DC link capacitor, the integrated operation system of the capacitive desalination module.
11. The method of claim 10,
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,
The integrated operation system of the capacitive desalination module, which has a value of 1/2 of the preset phase difference (PS).
8. The method of claim 7,
The integrated operation 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, the integrated operation system of the capacitive desalination module.
delete Capacitive desalination module, and supplying raw water to the capacitive desalination module, and receiving and storing the production water from which the ionic material has been removed by the capacitive desalination module or the concentrated water containing the removed ionic material is provided and stored A power storage comprising a facility, a bidirectional power conversion module for applying purified power and wastewater power to the capacitive desalination module to remove ionic substances in raw water, and a single processor for controlling the peripheral facilities and the bidirectional power conversion module In the control method of the integrated operation system of the type desalination module,
The single processor, in the water purification mode, opens the production water valve of the peripheral equipment while operating the transfer pump of the peripheral equipment, and controls the bidirectional power conversion module to supply the purified water power to the capacitive desalination module in advance applying for a first application time; and
The single processor, in the drainage mode, closes the production water valve of the peripheral equipment while opening the concentrated water valve of the peripheral equipment, and controls the bidirectional power conversion module to supply the drain power to the capacitive desalination module Including; applying for a preset second application time period;
The single processor,
In the water purification mode, the bidirectional power conversion module is controlled in a current mode so that a constant direct current is provided to the capacitive desalination module, but when the voltage at both ends of the capacitive desalination module reaches a target voltage, the capacitive desalination module It is controlled in voltage mode so that a constant DC voltage is applied,
In the discharge mode, the control method of the capacitive desalination module integrated operation system for controlling the bidirectional power conversion module in a current mode so that a constant direct current is output from the capacitive desalination module.
A computer-readable recording medium recording a program for executing the method of claim 14 on a computer.

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