CN109888832B - Water-wind-light complementary power generation and grid-connected control simulation experiment system - Google Patents
Water-wind-light complementary power generation and grid-connected control simulation experiment system Download PDFInfo
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Abstract
The invention discloses a water-wind-light complementary power generation and grid-connected control simulation experiment system, which belongs to the field of electrical engineering and comprises a power supply simulation power generation module, a power supply grid-connected control module, a direct current inversion module, an alternating current distribution module and an alternating current and direct current electrical parameter monitoring module. The system can realize the operation of hydraulic simulation power generation, wind simulation power generation and photovoltaic simulation power generation, and the operation is safe, simple and convenient; the system can flexibly realize water-wind complementary power generation and grid connection, wind-solar complementary power generation and grid connection, water-light complementary power generation and grid connection, and water-wind-light complementary power generation and grid connection, and overcomes the defects of randomness, fluctuation, intermittence and the like of the output characteristic of the distributed power supply to a certain extent; the system load is expandable; the system has simple structure, low cost and good control effect.
Description
Technical Field
The invention relates to the field of electrical engineering, in particular to a water-wind-light complementary power generation and grid-connected control simulation experiment system.
Background
With the exhaustion of traditional fossil energy and the rapid development of national economy, how to improve the energy utilization rate and change the energy structure becomes increasingly urgent. In this context, distributed power generation and its related technologies have attracted increasing attention from the world. Among them, the distributed energy sources such as wind, light and water have huge reserves, wide distribution, cleanness and safety, and are widely applied in China.
However, due to the limitations of randomness, volatility, intermittency and the like of the output characteristics of the distributed power supply, the grid-connected control is still in an exploration stage. Based on a water, wind and light distributed power supply complementary micro-grid networking technology and an operation control strategy, multi-source power generation and grid connection devices such as hydraulic power generation grid connection operation, photovoltaic power generation grid connection operation, wind power generation grid connection operation, storage battery energy storage system grid connection operation and water and wind and light complementary grid connection operation are in urgent need of development.
Disclosure of Invention
The invention aims to provide a water-wind-light complementary power generation and grid-connected control simulation experiment system, which overcomes the defects of randomness, volatility, intermittency and the like of the output characteristics of a distributed power supply and solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a water-wind-light complementary power generation and grid-connected control simulation experiment system comprises a power supply simulation power generation module, a power supply grid-connected control module, a direct current inversion module, an alternating current distribution module and an alternating current and direct current electrical parameter monitoring module,
the power supply simulation power generation module comprises a hydroelectric generation simulator, a wind power generation simulator and a photovoltaic power generation simulator, wherein the hydroelectric generation simulator, the wind power generation simulator and the photovoltaic power generation simulator are respectively connected with a direct current contactor and a power regulator through a single-phase air switch and further connected with a +/-48V direct current bus;
the power supply grid-connected control module comprises a storage battery pack, and the storage battery pack is connected with the direct current contactor and the charge and discharge manager through a single-phase air switch and further connected with a +/-48V direct current bus;
the direct current inversion module comprises a three-phase inverter, the upstream of the three-phase inverter is connected with a +/-48V direct current bus, the downstream of the three-phase inverter is connected with a hydroelectric alternating current contactor, a wind power alternating current contactor and a photovoltaic alternating current contactor which are connected in parallel through a three-phase air switch and a 220V alternating current bus, and power is supplied to a first load, a second load and a third load through a single-phase air switch;
the alternating current power distribution module comprises an electrical control system, the electrical control system is connected with a touch screen, and the electrical control system controls a direct current relay, a direct current contactor, an alternating current relay, a hydroelectric alternating current contactor connected in parallel, a wind power alternating current contactor and a photovoltaic alternating current contactor to determine whether hydroelectric power, wind power and photoelectricity are connected in a grid mode; the electrical control system controls a direct current relay, a direct current contactor and a charge and discharge manager of the storage battery pack to determine whether the storage battery pack supplies power to a +/-48V direct current bus;
the electrical parameter detection module comprises a monitoring system, the monitoring system is connected with a display, and the monitoring system monitors the voltage and the current of the direct current contactor, the first load, the second load and the third load and the voltage and the frequency of the alternating current bus respectively.
As a further scheme of the invention: when water and wind complementation is adopted, based on water and electricity, when the power of a microgrid is insufficient and the voltage of an alternating current bus is reduced to 95% of the rated voltage, an electric control system is used for controlling a direct current relay of wind power and a direct current contactor of the wind power to be closed, wind power is supplied to the +/-48V direct current bus side for power generation and is converted into 380/220V alternating current through a three-phase inverter, and meanwhile, an alternating current relay of the wind power and a wind power alternating current contactor are closed to supply power to the alternating current bus; when the power of the micro-grid is still insufficient and the voltage of the alternating-current bus is reduced to 95% of the rated voltage, the direct-current relay and the direct-current contactor of the storage battery pack are controlled to be closed through the electric control system, the state of the charge-discharge manager is controlled to be a discharge state, and the storage battery pack supplies power to the +/-48V direct-current bus; when the power of the microgrid has redundancy and the voltage of the alternating current bus rises to exceed 105% of the rated voltage, the power output by the power regulator can be controlled by the electric control system, so that the voltage of the alternating current bus is reduced to the rated voltage, the control strategy adopts master-slave control, and the control algorithm adopts SVPWM algorithm.
As a further scheme of the invention: when wind and light complementation is adopted, wind power is taken as a basis, when the power of a micro-grid is insufficient and the voltage of an alternating current bus is reduced to 95% of the rated voltage, an electric control system is used for controlling a direct current relay of wind power generation and a direct current contactor of the wind power generation to be closed, wind power generation is supplied to the +/-48V direct current bus side and is converted into 380/220V alternating current through a three-phase inverter, and meanwhile, an alternating current relay of photovoltaic power and a photovoltaic alternating current contactor are closed to supply power to the alternating current bus; when the power of the micro-grid is still insufficient and the voltage of the alternating-current bus is reduced to 95% of the rated voltage, the electric control system controls a direct-current relay and a direct-current contactor of the storage battery pack to be closed, the charge-discharge manager of the storage battery pack is in a discharge state, and the storage battery pack supplies power to the +/-48V direct-current bus; when the power of the microgrid has redundancy and the voltage of the alternating current bus rises to exceed 105% of the rated voltage, the power output by the power regulator can be controlled by the electric control system, so that the voltage of the alternating current bus is reduced to the rated voltage, the control strategy adopts master-slave control, and the control algorithm adopts SVPWM algorithm.
As a further scheme of the invention: when water-light complementation is adopted, based on hydropower, when the power of a microgrid is insufficient and the voltage of an alternating current bus is reduced to 95% of the rated voltage, an electric control system is used for controlling a direct current relay of photovoltaic power generation and a direct current contactor of photovoltaic power generation to be closed, photovoltaic power generation is supplied to the +/-48V direct current bus side and converted into 220V direct current through a three-phase inverter, and meanwhile, the alternating current relay of photovoltaic power and the photovoltaic alternating current contactor are closed to supply power to the alternating current bus; when the power of the micro-grid is still insufficient and the voltage of the alternating-current bus is reduced to 95% of the rated voltage, the direct-current relay and the direct-current contactor of the storage battery pack are controlled to be closed through the electric control system, the charge-discharge manager of the storage battery pack is in a discharge state, the storage battery pack supplies power to the +/-48V direct-current bus, the control strategy adopts master-slave control, and the control algorithm adopts an SVPWM algorithm.
As a further scheme of the invention: when water, wind and light complementation is adopted, based on water and electricity, when the power of a microgrid is insufficient and the voltage of an alternating current bus is reduced to 95% of the rated voltage, an electric control system is used for controlling a direct current relay of wind power and a direct current contactor of the wind power to be closed, wind power is supplied to the +/-48V direct current bus side for power generation and is converted into 220V direct current through a three-phase inverter, and meanwhile, an alternating current relay of the wind power and a wind power alternating current contactor are closed to supply power to the alternating current bus; when the power of the micro-grid is still insufficient and the voltage of the alternating current bus is reduced to 95% of the rated voltage, the electric control system controls the closing of a direct current relay of photovoltaic power generation and a direct current contactor of photovoltaic power generation, wind power is supplied to the +/-48V direct current bus side for power generation, the direct current is converted into 220V direct current through the three-phase inverter, and meanwhile, the alternating current relay of photovoltaic power and the photovoltaic alternating current contactor are closed to supply power to the alternating current bus; when the power of the micro-grid is still insufficient and the voltage of the alternating-current bus is reduced to 95% of the rated voltage, the direct-current relay and the direct-current contactor of the storage battery pack are controlled to be closed through the electric control system, and the storage battery pack supplies power to the +/-48V direct-current bus; when the power of the microgrid has redundancy and the voltage of the alternating current bus rises to exceed 105% of the rated voltage, the power output by the power regulator can be controlled by the electric control system, so that the voltage of the alternating current bus is reduced to the rated voltage, the control strategy adopts master-slave control, and the control algorithm adopts SVPWM algorithm.
As a further scheme of the invention: when the power of the microgrid has redundancy and the voltage of the alternating current bus exceeds 105% of a rated value, the state of a charge and discharge manager of the storage battery pack can be controlled to be a charging state through the electric control system, and the storage battery pack enters the charging state; when the monitoring system detects that the outlet voltage of the storage battery pack reaches the rated voltage, the electric control system controls a direct current relay and a direct current contactor of the storage battery pack to be disconnected, and the storage battery pack quits operation.
As a further scheme of the invention: when the power of the microgrid has redundancy, the voltage of the alternating-current bus exceeds 105% of the rated value, and the storage battery pack is already out of operation, the power regulator is controlled through the electric control system, the output of the hydroelectric generation simulator is properly reduced, and the control adopts PWM control.
As a further scheme of the invention: when the power of the microgrid has redundancy, the voltage of the alternating current bus exceeds 105% of a rated value, the storage battery pack is already out of operation, the power regulator is controlled by the electrical control system, the output of the hydroelectric generation simulator is properly reduced, and when the voltage of the alternating current bus still exceeds 105%, the output of the wind power generation simulator can be cut by the electrical control system through manual typing through the touch screen.
As a still further scheme of the invention: when the power of the microgrid has redundancy, the voltage of an alternating current bus exceeds 105% of a rated voltage, and the storage battery pack is already out of operation, the power regulator is controlled by the electrical control system, the output of the hydroelectric generation simulator is properly reduced, when the voltage of the alternating current bus still exceeds 105%, the output of the wind power generation simulator can be cut by the electrical control system through manual typing of the touch screen, and when the voltage of the alternating current bus still exceeds 105% of the rated voltage, the output of the photovoltaic generation simulator can be cut by the electrical control system through manual typing of the touch screen.
Compared with the prior art, the invention has the beneficial effects that:
1. the system can realize the operation of hydroelectric power generation, wind power generation and photovoltaic power generation, and the operation is safe, simple and convenient;
2. the system can flexibly realize water-wind complementary power generation and grid connection, wind-solar complementary power generation and grid connection, water-light complementary power generation and grid connection and water-wind-light complementary power generation and grid connection, and overcomes the defects of randomness, volatility, intermittence and the like of the output characteristic of the distributed power supply to a certain extent;
3. the system load is expandable;
4. the system has simple structure, low cost and good control effect.
Drawings
Fig. 1 is a schematic diagram of a water-wind-light complementary power generation and grid-connected control simulation experiment system.
Fig. 2 is a schematic diagram of an electrical control system in a water-wind-light complementary power generation and grid-connected control simulation experiment system.
In the figure: the system comprises a 1-single-phase air switch, a 2-hydroelectric generation simulator, a 3-wind power generation simulator, a 4-hydroelectric generation simulator, a 5-storage battery pack, a 6-direct current contactor, a 7-power regulator, an 8-charge and discharge manager, a 91-direct current relay, a 92-alternating current relay, a 10-electrical control system, a 11-touch screen, a 12-display, a 13-monitoring system, a 14-three-phase inverter, a 15-three-phase air switch, a 161-hydroelectric alternating current contactor, a 162-wind power alternating current contactor, a 163-photovoltaic alternating current contactor, a 17-first load, a 18-second load and a 19-third load.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, in an embodiment of the present invention, a water-wind-solar hybrid power generation and grid-connected control simulation experiment system includes a power analog power generation module, a power grid-connected control module, a dc inversion module, an ac power distribution module, and an ac/dc electrical parameter monitoring module:
the power supply simulation power generation module comprises a hydroelectric generation simulator, a wind power generation simulator and a photovoltaic power generation simulator, wherein the hydroelectric generation simulator, the wind power generation simulator and the photovoltaic power generation simulator are respectively connected with a direct current contactor and a power regulator through a single-phase air switch and further connected with a +/-48V direct current bus;
the power supply grid-connected control module comprises a storage battery pack, and the storage battery pack is connected with the direct current contactor and the charge and discharge manager through a single-phase air switch and further connected with a +/-48V direct current bus;
the direct current inversion module comprises a three-phase inverter, the upstream of the three-phase inverter is connected with a +/-48V direct current bus, the downstream of the three-phase inverter is connected with a hydroelectric alternating current contactor, a wind power alternating current contactor and a photovoltaic alternating current contactor which are connected in parallel through a three-phase air switch and a 220V alternating current bus, and power is supplied to a first load, a second load and a third load through a single-phase air switch;
the alternating current power distribution module comprises an electrical control system, the electrical control system is connected with a touch screen, and the electrical control system controls a direct current relay, a direct current contactor, an alternating current relay, a hydroelectric alternating current contactor connected in parallel, a wind power alternating current contactor and a photovoltaic alternating current contactor to determine whether hydroelectric power, wind power and photoelectricity are connected in a grid mode; the electrical control system controls a direct current relay, a direct current contactor and a charge and discharge manager of the storage battery pack to determine whether the storage battery pack supplies power to a +/-48V direct current bus;
the electrical parameter detection module comprises a monitoring system, the monitoring system is connected with a display, and the monitoring system monitors the voltage and the current of the direct current contactor, the first load, the second load and the third load and the voltage and the frequency of the alternating current bus respectively.
When water and wind complementation is adopted, based on water and electricity, when the power of a microgrid is insufficient and the voltage of an alternating current bus is reduced to 95% of the rated voltage, an electric control system is used for controlling a direct current relay of wind power and a direct current contactor of the wind power to be closed, wind power is supplied to the +/-48V direct current bus side for power generation and is converted into 380/220V alternating current through a three-phase inverter, and meanwhile, an alternating current relay of the wind power and a wind power alternating current contactor are closed to supply power to the alternating current bus; when the power of the micro-grid is still insufficient and the voltage of the alternating-current bus is reduced to 95% of the rated voltage, the direct-current relay and the direct-current contactor of the storage battery pack are controlled to be closed through the electric control system, the state of the charge-discharge manager is controlled to be a discharge state, and the storage battery pack supplies power to the +/-48V direct-current bus; when the power of the microgrid has redundancy and the voltage of the alternating current bus rises to exceed 105% of the rated voltage, the power output by the power regulator can be controlled by the electric control system, so that the voltage of the alternating current bus is reduced to the rated voltage, the control strategy adopts master-slave control, and the control algorithm adopts SVPWM algorithm.
When wind and light complementation is adopted, wind power is taken as a basis, when the power of a micro-grid is insufficient and the voltage of an alternating current bus is reduced to 95% of the rated voltage, an electric control system is used for controlling a direct current relay of wind power generation and a direct current contactor of the wind power generation to be closed, wind power generation is supplied to the +/-48V direct current bus side and is converted into 380/220V alternating current through a three-phase inverter, and meanwhile, an alternating current relay of photovoltaic power and a photovoltaic alternating current contactor are closed to supply power to the alternating current bus; when the power of the micro-grid is still insufficient and the voltage of the alternating-current bus is reduced to 95% of the rated voltage, the electric control system controls a direct-current relay and a direct-current contactor of the storage battery pack to be closed, the charge-discharge manager of the storage battery pack is in a discharge state, and the storage battery pack supplies power to the +/-48V direct-current bus; when the power of the microgrid has redundancy and the voltage of the alternating current bus rises to exceed 105% of the rated voltage, the power output by the power regulator can be controlled by the electric control system, so that the voltage of the alternating current bus is reduced to the rated voltage, the control strategy adopts master-slave control, and the control algorithm adopts SVPWM algorithm.
When water-light complementation is adopted, based on hydropower, when the power of a microgrid is insufficient and the voltage of an alternating current bus is reduced to 95% of the rated voltage, an electric control system is used for controlling a direct current relay of photovoltaic power generation and a direct current contactor of photovoltaic power generation to be closed, photovoltaic power generation is supplied to the +/-48V direct current bus side and converted into 220V direct current through a three-phase inverter, and meanwhile, the alternating current relay of photovoltaic power and the photovoltaic alternating current contactor are closed to supply power to the alternating current bus; when the power of the micro-grid is still insufficient and the voltage of the alternating-current bus is reduced to 95% of the rated voltage, the direct-current relay and the direct-current contactor of the storage battery pack are controlled to be closed through the electric control system, the charge-discharge manager of the storage battery pack is in a discharge state, the storage battery pack supplies power to the +/-48V direct-current bus, the control strategy adopts master-slave control, and the control algorithm adopts an SVPWM algorithm.
When water, wind and light are used for complementation, water and electricity are used as a basis, when the power of a microgrid is insufficient and the voltage of an alternating current bus is reduced to 95% of the rated voltage, an electric control system is used for controlling a direct current relay of wind power and a direct current contactor of the wind power to be closed, wind power is supplied to the +/-48V direct current bus side for power generation, the direct current is converted into 220V direct current through a three-phase inverter, and meanwhile, an alternating current relay of the wind power and a wind power alternating current contactor are closed to supply power to the alternating current bus; when the power of the micro-grid is still insufficient and the voltage of the alternating current bus is reduced to 95% of the rated voltage, the electric control system controls the closing of a direct current relay of photovoltaic power generation and a direct current contactor of photovoltaic power generation, wind power is supplied to the +/-48V direct current bus side for power generation, the direct current is converted into 220V direct current through the three-phase inverter, and meanwhile, the alternating current relay of photovoltaic power and the photovoltaic alternating current contactor are closed to supply power to the alternating current bus; when the power of the micro-grid is still insufficient and the voltage of the alternating-current bus is reduced to 95% of the rated voltage, the direct-current relay and the direct-current contactor of the storage battery pack are controlled to be closed through the electric control system, and the storage battery pack supplies power to the +/-48V direct-current bus; when the power of the microgrid has redundancy and the voltage of the alternating current bus rises to exceed 105% of the rated voltage, the power output by the power regulator can be controlled by the electric control system, so that the voltage of the alternating current bus is reduced to the rated voltage, the control strategy adopts master-slave control, and the control algorithm adopts SVPWM algorithm.
When the power of the microgrid has redundancy and the voltage of the alternating current bus exceeds 105% of a rated value, the state of a charge and discharge manager of the storage battery pack can be controlled to be a charging state through the electric control system, and the storage battery pack enters the charging state; when the monitoring system detects that the outlet voltage of the storage battery pack reaches the rated voltage, the electric control system controls a direct current relay and a direct current contactor of the storage battery pack to be disconnected, and the storage battery pack quits operation.
When the power of the microgrid has redundancy, the voltage of the alternating-current bus exceeds 105% of the rated value, and the storage battery pack is already out of operation, the power regulator is controlled through the electric control system, the output of the hydroelectric generation simulator is properly reduced, and the control adopts PWM control.
When the power of the microgrid has redundancy, the voltage of the alternating current bus exceeds 105% of a rated value, the storage battery pack is already out of operation, the power regulator is controlled by the electrical control system, the output of the hydroelectric generation simulator is properly reduced, and when the voltage of the alternating current bus still exceeds 105%, the output of the wind power generation simulator can be cut by the electrical control system through manual typing through the touch screen.
When the power of the microgrid has redundancy, the voltage of an alternating current bus exceeds 105% of a rated voltage, and the storage battery pack is already out of operation, the power regulator is controlled by the electrical control system, the output of the hydroelectric generation simulator is properly reduced, when the voltage of the alternating current bus still exceeds 105%, the output of the wind power generation simulator can be cut by the electrical control system through manual typing of the touch screen, and when the voltage of the alternating current bus still exceeds 105% of the rated voltage, the output of the photovoltaic generation simulator can be cut by the electrical control system through manual typing of the touch screen.
When grid-connected operation fails, the unidirectional air switch 1 and the three-phase air switch 15 automatically cut off current, and the system is protected.
As shown in fig. 2, the electrical control system provided by the embodiment of the present invention has the following principle: and inputting the measured voltage at the side of the alternating current bus into a single chip microcomputer, and respectively controlling whether the water and electricity, the wind power, the photovoltaic power generation and the storage battery are put into operation or not by utilizing a PQ control algorithm and a V/F control algorithm. After the grid connection is finished, the power regulator can be used for finely adjusting the output of hydropower, wind power and photovoltaic, and the fine adjustment method adopts PWM control.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The utility model provides a complementary electricity generation of water wind-light and grid-connected control simulation experiment system, includes power simulation power generation module, power grid-connected control module, direct current contravariant module, alternating current distribution module and alternating current-direct current electrical parameter monitoring module, its characterized in that:
the power supply simulation power generation module comprises a hydroelectric generation simulator (2), a wind power generation simulator (3) and a photovoltaic power generation simulator (4), wherein the hydroelectric generation simulator (2), the wind power generation simulator (3) and the photovoltaic power generation simulator (4) are respectively connected with a direct current contactor (6) and a power regulator (7) through a single-phase air switch (1) and further connected with a +/-48V direct current bus;
the power supply grid-connected control module comprises a storage battery pack (5), wherein the storage battery pack (5) is connected with a direct current contactor (6) and a charge and discharge manager (8) through a single-phase air switch (1) and further connected with a +/-48V direct current bus;
the direct current inversion module comprises a three-phase inverter (14), wherein the upstream of the three-phase inverter (14) is connected with a +/-48V direct current bus, the downstream of the three-phase inverter is connected with a 220V alternating current bus through a three-phase air switch (15), a hydroelectric alternating current contactor (161), a wind-electric alternating current contactor (162) and a photovoltaic alternating current contactor (163) which are connected in parallel, and power is respectively supplied to a first load (17), a second load (18) and a third load (19) through a single-phase air switch (1);
the alternating current power distribution module comprises an electrical control system (10), the electrical control system (10) is connected with a touch screen (11), and the electrical control system (10) controls a direct current relay (91), a direct current contactor (6), an alternating current relay (92), a hydroelectric and electric alternating current contactor (161), a wind and electric alternating current contactor (162) and a photovoltaic alternating current contactor (163) which are connected in parallel to determine whether hydroelectric power, wind power and photoelectric power are connected in a grid mode; the electrical control system (10) controls a direct current relay (91), a direct current contactor (6) and a charge and discharge manager (8) of the storage battery pack (5) to determine whether the storage battery pack (5) supplies power to a +/-48V direct current bus;
the electrical parameter monitoring module comprises a monitoring system (13), the monitoring system (13) is connected with a display (12), and the monitoring system (13) monitors the voltage and the current of the direct current contactor (6), the first load (17), the second load (18) and the third load (19) and the voltage and the frequency of an alternating current bus respectively;
when water and wind complementation is adopted, water and electricity are taken as a basis, when the power of a microgrid is insufficient and the voltage of an alternating current bus is reduced to 95% of the rated voltage, an electric control system (10) is used for controlling a direct current relay (91) of wind power and a direct current contactor (6) of the wind power to be closed, wind power is supplied to the +/-48V direct current bus side for power generation, the alternating current relay (92) of the wind power and the wind power alternating current contactor (162) are converted into 380/220V alternating current through a three-phase inverter (14), and meanwhile, the alternating current relay (92) of the wind power and the wind power alternating current contactor (162) are closed to supply power to the alternating current bus; when the power of the microgrid is still insufficient and the voltage of the alternating-current bus is reduced to 95% of the rated voltage, the direct-current relay (91) and the direct-current contactor (6) of the storage battery pack (5) are controlled to be closed through the electric control system (10), the state of the charge-discharge manager (8) is controlled to be a discharge state, and the storage battery pack (5) supplies power to the +/-48V direct-current bus; when the power of the microgrid has redundancy and the voltage of the alternating current bus rises to exceed 105% of the rated voltage, the power output by the power regulator (7) can be controlled by the electric control system (10) to ensure that the voltage of the alternating current bus is reduced to the rated voltage, the control strategy adopts master-slave control, and the control algorithm adopts SVPWM algorithm;
when wind and light complementation is adopted, wind power is taken as a basis, when the power of a microgrid is insufficient and the voltage of an alternating current bus is reduced to 95% of the rated voltage, a direct current relay (91) of wind power generation and a direct current contactor (6) of wind power generation are controlled to be closed through an electrical control system (10), wind power generation is supplied to the +/-48V direct current bus side, the alternating current is converted into 380/220V alternating current through a three-phase inverter (14), and meanwhile, an alternating current relay (92) of photovoltaic power and a photovoltaic alternating current contactor (163) are closed to supply power to the alternating current bus; when the power of the microgrid is still insufficient and the voltage of the alternating-current bus is reduced to 95% of the rated voltage, the direct-current relay (91) and the direct-current contactor (6) of the storage battery pack (5) are controlled to be closed through the electric control system (10), the charge-discharge manager (8) of the storage battery pack (6) is in a discharge state, and the storage battery pack (5) supplies power to the +/-48V direct-current bus; when the power of the microgrid has redundancy and the voltage of the alternating current bus rises to exceed 105% of the rated voltage, the power output by the power regulator (7) can be controlled by the electric control system (10) to ensure that the voltage of the alternating current bus is reduced to the rated voltage, the control strategy adopts master-slave control, and the control algorithm adopts SVPWM algorithm;
when water and light complementation is adopted, based on water and electricity, when the power of a microgrid is insufficient and the voltage of an alternating current bus is reduced to 95% of the rated voltage, an electric control system (10) is used for controlling a direct current relay (91) of photovoltaic power generation and a direct current contactor (6) of photovoltaic power generation to be closed, the photovoltaic power generation is supplied to the +/-48V direct current bus side and is converted into 220V direct current through a three-phase inverter (14), and meanwhile, an alternating current relay (92) of photovoltaic power and a photovoltaic alternating current contactor (163) are closed to supply power to the alternating current bus; when the power of the microgrid is still insufficient and the voltage of an alternating-current bus is reduced to 95% of the rated voltage, an electric control system (10) is used for controlling a direct-current relay (91) and a direct-current contactor (6) of a storage battery pack (5) to be closed, a charge and discharge manager (8) of the storage battery pack (6) is in a discharge state, the storage battery pack (5) supplies power to a +/-48V direct-current bus, a control strategy adopts master-slave control, and a control algorithm adopts an SVPWM algorithm;
when water, wind and light complementation is adopted, based on water and electricity, when the power of a microgrid is insufficient and the voltage of an alternating current bus is reduced to 95% of the rated voltage, an electric control system (10) is used for controlling a direct current relay (91) of wind power and a direct current contactor (6) of the wind power to be closed, wind power is supplied to the +/-48V direct current bus side for power generation and is converted into 220V direct current through a three-phase inverter (14), and meanwhile, an alternating current relay (92) of the wind power and an alternating current contactor (162) of the wind power are closed to supply power to the alternating current bus; when the power of the micro-grid is still insufficient and the voltage of the alternating current bus is reduced to 95% of the rated voltage, the electric control system (10) is used for controlling the photovoltaic power generation direct current relay (91) and the photovoltaic power generation direct current contactor (6) to be closed, wind power generation is supplied to the +/-48V direct current bus side, the direct current is converted into 220V direct current through the three-phase inverter (14), meanwhile, the photovoltaic alternating current relay (92) and the photovoltaic alternating current contactor (163) are closed, and power is supplied to the alternating current bus; when the power of the micro-grid is still insufficient and the voltage of the alternating-current bus is reduced to 95% of the rated voltage, the direct-current relay (91) and the direct-current contactor (6) of the storage battery pack (5) are controlled to be closed through the electric control system (10), and the storage battery pack (5) supplies power to the +/-48V direct-current bus; when the power of the microgrid has redundancy and the voltage of the alternating current bus rises to exceed 105% of the rated voltage, the power output by the power regulator (7) can be controlled through the electric control system (10), so that the voltage of the alternating current bus is reduced to the rated voltage, the control strategy adopts master-slave control, and the control algorithm adopts SVPWM algorithm.
2. The water-wind-light complementary power generation and grid-connection control simulation experiment system as claimed in any one of claim 1, wherein when the power of the microgrid has redundancy and the voltage of the alternating current bus exceeds 105% of a rated value, the state of a charge-discharge manager (8) of the storage battery pack (5) can be controlled to be a charging state through the electrical control system (10), and the storage battery pack (5) enters the charging state; when the monitoring system (13) detects that the outlet voltage of the storage battery pack (5) reaches the rated voltage, the direct current relay (91) and the direct current contactor (6) of the storage battery pack (5) are controlled to be disconnected through the electric control system (10), and the storage battery pack (5) stops running.
3. The water-wind-light complementary power generation and grid-connection control simulation experiment system as claimed in claim 1, wherein when the microgrid power has redundancy, the alternating-current bus voltage exceeds 105% of the rated value, and the storage battery pack (5) is out of operation, the power regulator (8) is controlled by the electrical control system (10), and the output of the hydroelectric power generation simulator (2) is appropriately reduced, wherein the control adopts PWM control.
4. The water-wind-light complementary power generation and grid-connection control simulation experiment system as claimed in claim 1, wherein when the microgrid power has redundancy, the alternating current bus voltage exceeds 105% of the rated value, and the storage battery pack (5) is already out of operation, the power regulator (8) is controlled by the electrical control system (10), the output of the hydroelectric power generation simulator (2) is appropriately reduced, and when the alternating current bus voltage still exceeds 105%, the touch screen (11) can be manually keyed in, so that the electrical control system (10) cuts off the output of the wind power generation simulator (3).
5. The water-wind-light complementary power generation and grid-connection control simulation experiment system as claimed in claim 1, wherein when the microgrid power has redundancy, the alternating current bus voltage exceeds 105% of the rated value, and the storage battery pack (5) is already out of operation, the power regulator (8) is controlled by the electrical control system (10), the output of the hydroelectric generation simulator (2) is appropriately reduced, when the alternating current bus voltage still exceeds 105%, the touch screen (11) can be used for manually typing in, so that the electrical control system (10) cuts off the output of the wind power generation simulator (3), and when the alternating current bus voltage still exceeds 105% of the rated voltage, the touch screen (11) can be used for manually typing in, so that the electrical control system (10) cuts off the output of the photovoltaic generation simulator (4).
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