Controller for energy generation system

1. An energy generation system, comprising:

a forward osmosis membrane unit comprising a separation membrane therein and configured to fluidly communicate with a discharge of non-permeating water, a supply of fresh water, a supply of salt water and a discharge of mixed water resulting from water that permeates the separation membrane; and

a controller comprising:

a first regulator that regulates the discharge of non-permeating water, by a non-permeating water discharger, from the forward osmosis membrane unit;

a second regulator that regulates the supply of fresh water, by a fresh water supplier, to the forward osmosis membrane unit;

a third regulator that regulates the supply of salt water, by a salt water supplier, to the forward osmosis membrane unit;

a fourth regulator that regulates the discharge of mixed water, by a mixed water discharger, from the forward osmosis membrane unit; and

a regulation controller that controls:

the first regulator, the second regulator, the third regulator, and the fourth regulator,

wherein the regulation controller controls the first regulator, the second regulator, the third regulator, and the fourth regulator according to a priority order,

the first regulator including a first control valve configured to change an opening amount therein so as to regulate the discharge of the non-permeating water from the forward osmosis membrane unit upon receipt of a first control signal from the regulation controller,

the second regulator including one of a second control valve and a pump of the second regulator, wherein a second control signal from the regulation controller is configured to control the supply of fresh water to the forward osmosis membrane unit to be approximately constant,

the third regulator including one of a third control valve and a pump of the third regulator, wherein a third control signal from the regulation controller is configured to control the supply of salt water to the forward osmosis membrane unit to be approximately constant, and

the fourth regulator including a fourth control valve, wherein a fourth control signal from the regulation controller is configured to control the discharge pressure of the mixed water to be approximately constant, wherein

the priority order is based upon measures selected from a group comprising one of:

(i) a number of times the regulation controller outputs each of the control signals in a fixed period;

(ii) an amount of time the regulation controller outputs each of the control signals in a fixed period; and

(iii) a frequency with which the regulation controller outputs each of the control signals in a fixed period.

2. The energy generation system according to claim 1 , wherein the forward osmosis membrane unit includes:

a salt water passage through which salt water supplied by the third regulator passes; and

a fresh water passage through which fresh water supplied by the second regulator passes, and

wherein the mixed water is produced by an osmosis phenomenon in the forward osmosis membrane unit.

3. The energy generation system according to claim 1 , wherein the priority order is as follows: in terms of the number of times the regulation controller outputs each of the control signals in a fixed period,

the number of times each of the control signals are outputted satisfying the following relation:

the first control signal≥the second control signal≥the third control signal≥the fourth control signal.

4. The energy generation system according to claim 1 ,

wherein the priority order is as follows: in terms of the amount of time the regulation controller outputs each of the control signals in a fixed period,

the amount of time each of the control signals are outputted satisfying the following relation:

the first control signal≥the second control signal≥the third control signal≥the fourth control signal.

5. The energy generation system according to claim 1 ,

wherein the priority order is as follows: in terms of the frequency with which the regulation controller outputs each of the control signals in a fixed period,

the frequency of the control signals being outputted to satisfy the following relation:

the first control≥signal the second control signal≥the third control≥signal the fourth control signal.

6. The energy generation system according to claim 1 ,

wherein the priority order is such that an order in which the regulation controller outputs the control signals in a fixed period is

the first control signal, the second control signal, the third control signal, and then the fourth control signal.

7. The energy generation system according to claim 1 , wherein the first control signal controls the first regulator so as to keep the discharge of non-permeating water approximately constant.

8. The energy generation system according to claim 1 , wherein the second control signal controls the second regulator so as to keep a supply pressure of fresh water to the forward osmosis membrane unit approximately constant.

9. The energy generation system according to claim 8 , wherein the second control signal controls the second regulator, based on at least one of an amount of discharge of the mixed water and a discharge pressure of the mixed water.

10. The energy generation system according to claim 1 , wherein the third control signal controls the third regulator so as to keep the supply of salt water to the forward osmosis membrane unit approximately constant.

11. The energy generation system according to claim 1 , wherein the fourth control signal controls the fourth regulator so as to keep a discharge pressure of the mixed water approximately constant.

12. The energy generation system according to claim 11 , wherein the fourth control signal controls the fourth regulator, based on a salt concentration of the mixed water, so as to keep the discharge pressure of the mixed water approximately constant.