CN117977520A - Light Chu Zhirou direct-current micro-grid system and control method thereof - Google Patents
Light Chu Zhirou direct-current micro-grid system and control method thereof Download PDFInfo
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Abstract
The invention relates to an optical storage direct-current flexible direct-current micro-grid system and a control method thereof, comprising the following steps: the photovoltaic module is connected with a direct current bus through a photovoltaic DCDC converter, the energy storage battery is connected with the direct current bus through an energy storage DCDC converter, the direct current bus is connected with a power grid system through a bidirectional DCAC converter, and the direct current bus is connected with a direct current load through a load DCDC converter; the energy management system controls the energy storage DCDC converter and the bidirectional DCAC converter according to the direct current power and the electric power of the direct current load, so that the direct current power is larger than the electric power, redundant direct current electric energy is stored in the energy storage battery, electric energy cannot be stored in the energy storage battery, redundant direct current is fed back to the power grid system, or the direct current power is smaller than the electric power, electric energy stored in the energy storage battery is provided to the direct current bus, electric energy cannot be provided in the energy storage battery, and electric energy of the power grid system is integrated into the direct current bus.
Description
Technical Field
The disclosure relates to the technical field of photovoltaic power generation, in particular to a light storage direct-current flexible direct-current micro-grid system and a control method thereof.
Background
The light storage power supply is an important mode for realizing carbon neutralization by civil electricity, after photovoltaic equipment is installed on a roof, flexible matching is not only between direct current load power consumption and electric energy stored by an energy storage system, but also between grid connection and grid disconnection of the direct current load, the light Chu Zhirou not only affects the power consumption safety and service life of the direct current load equipment, but also directly affects the stability of a power grid system, and if the direct current load is frequently switched between grid connection and grid disconnection, the power supply quantity of the power grid system cannot be timely adjusted, so that the power oscillation of the power grid system can be caused.
Disclosure of Invention
The invention aims to provide an optical storage direct-soft direct-current micro-grid system and a control method thereof, and aims to solve the technical problem that a power system cannot adjust the power supply quantity in time to cause power oscillation of the power system due to frequent grid-connection and grid-disconnection switching of a direct-current load in related scenes.
To achieve the above object, a first aspect of the embodiments of the present disclosure provides an optical storage direct-soft direct-current micro-grid system, the optical Chu Zhirou direct-current micro-grid system including:
the system comprises a photovoltaic assembly, a photovoltaic DCDC converter, a direct current bus, an energy storage battery, an energy storage DCDC converter, a bidirectional DCAC converter, a load DCDC converter and an energy management system;
the photovoltaic module is connected with the direct current bus through the photovoltaic DCDC converter, the energy storage battery is connected with the direct current bus through the energy storage DCDC converter, the direct current bus is connected with a power grid system through the bidirectional DCAC converter, and the direct current bus is connected with a direct current load through the load DCDC converter;
The energy management system is respectively in communication connection with the photovoltaic DCDC converter, the energy storage DCDC converter, the bidirectional DCAC converter and the load DCDC converter;
The photovoltaic DCDC converter is used for converting electric energy provided by the photovoltaic assembly into direct current by maximum power tracking and outputting the direct current to the direct current bus;
The energy management system is used for controlling the energy storage DCDC converter and the bidirectional DCAC converter according to the direct current power and the electric power of the direct current load so as to store redundant direct current electric energy into the energy storage battery when the direct current power is larger than the electric power and feed the redundant direct current electric energy back into the power grid system when the energy storage battery cannot store the electric energy, or supply the electric energy stored in the energy storage battery into the direct current bus when the direct current power is smaller than the electric power and combine the electric energy of the power grid system into the direct current bus when the energy storage battery cannot supply the electric energy.
In one possible implementation manner, the photovoltaic DCDC converter is specifically configured to convert the electrical energy provided by the photovoltaic module into direct current with maximum power tracking by:
acquiring the temperature of each solar cell panel in the photovoltaic module;
Determining the output current of each solar panel according to the temperature and the energy conversion efficiency of the solar panel;
Predicting the predicted output current at the next moment according to the output current at the current moment and the corresponding current change step length, wherein the current change step length is determined according to the illumination intensity of seasons and the illumination intensity change of each day in each season;
carrying out current correction on the output current through the predicted output current;
Obtaining maximum power tracking points of each solar panel in B and D;
and (3) bringing the maximum power tracking points of the B and the D and the rectified current into a preset calculation formula, determining the output power of the maximum power tracking corresponding to the photovoltaic module, and controlling the photovoltaic DCDC converter to convert the electric energy provided by the photovoltaic module into direct current by using the output power of the maximum power tracking.
In one possible implementation manner, the preset calculation formula is:
；
Wherein V MPPT is the voltage of maximum power tracking, I MPPT is the current after deviation correction, J B and J D are the maximum power tracking points of B and D respectively, I SC is the preset short-circuit current of the solar panel, V OC is the preset open-circuit voltage of the implementation solar panel, and P MPPT is the output power of maximum power tracking.
In one possible implementation, the energy management system is specifically configured to:
Controlling the energy storage DCDC converter to reduce the voltage and outputting the direct current electric energy on the direct current bus to the energy storage battery under the condition that the direct current electric power is larger than the electric power of the direct current load; and is combined with the other components of the water treatment device,
And under the condition that the energy storage battery cannot store electric energy, controlling the bidirectional DCAC converter to convert the direct-current electric energy on the direct-current bus into alternating current and feed the alternating current back to the power grid system.
In one possible implementation, the energy management system is specifically configured to:
Under the condition that the direct-current power is smaller than the power consumption of the direct-current load, controlling the energy storage DCDC converter to boost and outputting the direct-current electric energy stored in the energy storage battery to the direct-current bus; and is combined with the other components of the water treatment device,
And under the condition that the residual electric quantity of the energy storage battery is lower than a preset electric quantity threshold value, controlling the bidirectional DCAC converter to convert alternating current on the power grid system into direct current and outputting the direct current to the direct current bus.
In one possible implementation, the energy management system is further configured to:
And under the condition that the photovoltaic module does not output electric energy to the direct current, the direct current load stops using electric energy, and the current moment is in the electricity consumption valley period of the power grid system, the bidirectional DCAC converter is controlled to convert alternating current on the power grid system into direct current to be output to the direct current bus, and the energy storage DCDC converter is controlled to step down to output the direct current electric energy on the direct current bus to the energy storage battery.
In a second aspect of the embodiments of the present disclosure, a control method of a photovoltaic direct-current flexible direct-current micro grid system is provided, and the control method is applied to an energy management system, where the energy management system is respectively in communication connection with a photovoltaic DCDC converter, an energy storage DCDC converter, a bidirectional DCAC converter and a load DCDC converter in the photovoltaic Chu Zhirou direct-current micro grid system, a photovoltaic module in the photovoltaic Chu Zhirou direct-current micro grid system is connected with a direct-current bus through the photovoltaic DCDC converter, an energy storage battery in the photovoltaic Chu Zhirou direct-current micro grid system is connected with the direct-current bus through the energy storage DCDC converter, the direct-current bus is connected with a grid system through the bidirectional DCAC converter, and the direct-current bus is connected with a direct-current load through the load DCDC converter, and the control method of the photovoltaic Chu Zhirou direct-current micro grid system includes:
controlling the photovoltaic DCDC converter to track with maximum power, converting electric energy provided by the photovoltaic module into direct current, and outputting the direct current to the direct current bus;
And controlling the energy storage DCDC converter and the bidirectional DCAC converter according to the direct current power and the electric power of the direct current load so as to store redundant direct current electric energy into the energy storage battery under the condition that the direct current power is larger than the electric power, and feed the redundant direct current electric energy back to the power grid system under the condition that the energy storage battery cannot store the electric energy, or supply the electric energy stored in the energy storage battery to the direct current bus under the condition that the direct current power is smaller than the electric power, and integrate the electric energy of the power grid system into the direct current bus under the condition that the energy storage battery cannot supply the electric energy.
In one possible implementation manner, the controlling the photovoltaic DCDC converter to track at maximum power to convert the electrical energy provided by the photovoltaic module into direct current and output the direct current to the direct current bus includes:
acquiring the temperature of each solar cell panel in the photovoltaic module;
Determining the output current of each solar panel according to the temperature and the energy conversion efficiency of the solar panel;
Predicting the predicted output current at the next moment according to the output current at the current moment and the corresponding current change step length, wherein the current change step length is determined according to the illumination intensity of seasons and the illumination intensity change of each day in each season;
carrying out current correction on the output current through the predicted output current;
Obtaining maximum power tracking points of each solar panel in B and D;
And (3) bringing the maximum power tracking points of the B and the D and the rectified current into a preset calculation formula, determining the output power of the maximum power tracking corresponding to the photovoltaic module, controlling the photovoltaic DCDC converter to convert the electric energy provided by the photovoltaic module into direct current by using the output power of the maximum power tracking, and outputting the direct current to the direct current bus.
In one possible implementation manner, the controlling the energy storage DCDC converter and the bidirectional DCAC converter according to the direct current power and the electric power of the direct current load includes:
Controlling the energy storage DCDC converter to reduce the voltage and outputting the direct current electric energy on the direct current bus to the energy storage battery under the condition that the direct current electric power is larger than the electric power of the direct current load; under the condition that the energy storage battery cannot store electric energy, the bidirectional DCAC converter is controlled to convert the direct-current electric energy on the direct-current bus into alternating current and feed the alternating current back to the power grid system;
Or alternatively
Under the condition that the direct-current power is smaller than the power consumption of the direct-current load, controlling the energy storage DCDC converter to boost and outputting the direct-current electric energy stored in the energy storage battery to the direct-current bus; and under the condition that the residual electric quantity of the energy storage battery is lower than a preset electric quantity threshold value, controlling the bidirectional DCAC converter to convert alternating current on the power grid system into direct current and output the direct current to the direct current bus.
In one possible implementation manner, the control method of the optical Chu Zhirou direct-current micro-grid system further includes:
And under the condition that the photovoltaic module does not output electric energy to the direct current, the direct current load stops using electric energy, and the current moment is in the electricity consumption valley period of the power grid system, the bidirectional DCAC converter is controlled to convert alternating current on the power grid system into direct current to be output to the direct current bus, and the energy storage DCDC converter is controlled to step down to output the direct current electric energy on the direct current bus to the energy storage battery.
Advantageous effects
The invention provides an optical storage direct-current flexible direct-current micro-grid system and a control method thereof. Compared with the prior art, the method has the following beneficial effects:
The photovoltaic module is connected with a direct current bus through a photovoltaic DCDC converter, the energy storage battery is connected with the direct current bus through an energy storage DCDC converter, the direct current bus is connected with a power grid system through a bidirectional DCAC converter, and the direct current bus is connected with a direct current load through a load DCDC converter; the energy management system controls the energy storage DCDC converter and the bidirectional DCAC converter according to the direct current power and the electric power of the direct current load, so that the direct current power is larger than the electric power, redundant direct current electric energy is stored in the energy storage battery, electric energy cannot be stored in the energy storage battery, redundant direct current is fed back to the power grid system, or the direct current power is smaller than the electric power, electric energy stored in the energy storage battery is provided to the direct current bus, electric energy cannot be provided in the energy storage battery, and electric energy of the power grid system is integrated into the direct current bus. Not only can provide electric energy through photovoltaic module, can also store the energy storage battery with surplus electric energy, and then can supply power for the direct current load through the energy storage battery, avoid frequently switching between being incorporated into the power networks and from the net switching, and then avoid the unable timely adjustment power supply volume of grid system, lead to grid system's electric shock.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
Fig. 1 is a schematic diagram of an optical storage direct-flexible direct-current micro-grid system according to an embodiment of the present disclosure.
Fig. 2 is a flowchart illustrating a control method of the optical storage direct-soft direct-current micro grid system according to an embodiment of the present disclosure.
Fig. 3 is a flowchart for implementing step S21 in fig. 2, according to an embodiment of the present disclosure.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
The disclosure provides a control method of an optical storage direct-soft direct-current micro-grid system, as shown in fig. 1, the optical Chu Zhirou direct-current micro-grid system includes:
the system comprises a photovoltaic assembly, a photovoltaic DCDC converter, a direct current bus, an energy storage battery, an energy storage DCDC converter, a bidirectional DCAC converter, a load DCDC converter and an energy management system;
The direct current bus is 750V, the photovoltaic modules are respectively connected with the direct current bus of 750V through the photovoltaic DCDC converters, the three photovoltaic modules are respectively connected with the direct current bus of 750V through one photovoltaic DCDC converter, the total power of the photovoltaic DCDC converters is 90kW, and each photovoltaic DCDC converter realizes the maximum power tracking of the photovoltaic modules, as shown in the figure 1.
The energy storage battery is a lead-carbon battery with high safety and long cycle life, meets the fire-fighting conditions of the building, and is connected to a 750V direct current bus through an energy storage DCDC converter. The rated power of the energy storage DCDC converter is 50KW, and the rated current is 150A.
In the embodiment of the disclosure, the photovoltaic modules are electrically connected with a 750V direct current bus through photovoltaic DCDC converters with rated power of 90KW and rated current of 120A respectively. And the direct current load is electrically connected with a direct current bus of 750V through a load DCDC converter with rated power of 50KW and rated current of 350A. Wherein, the rated power of the bidirectional DCAC converter is 100KW.
The photovoltaic module is connected with the direct current bus through the photovoltaic DCDC converter, the energy storage battery is connected with the direct current bus through the energy storage DCDC converter, the direct current bus is connected with a power grid system through the bidirectional DCAC converter, and the direct current bus is connected with a direct current load through the load DCDC converter;
The energy management system is respectively in communication connection with the photovoltaic DCDC converter, the energy storage DCDC converter, the bidirectional DCAC converter and the load DCDC converter;
The energy management system is respectively in communication connection with the photovoltaic DCDC converter, the energy storage DCDC converter, the bidirectional DCAC converter and the load DCDC converter through a CAN bus. The energy management system may be configured with a control panel to facilitate viewing and setting of corresponding parameters via the control panel. Optionally, the energy management system is communicatively connected to the energy storage battery via a CAN bus. The direct current load may be a direct current lighting fixture and the direct current lighting fixture is electrically connected to the load DCDC converter through the lighting feeder box.
The photovoltaic DCDC converter is used for converting electric energy provided by the photovoltaic assembly into direct current by maximum power tracking and outputting the direct current to the direct current bus;
the photovoltaic DCDC converter, the energy storage DCDC converter and the load DCDC converter can realize overvoltage and undervoltage protection on the high-voltage side, overvoltage and undervoltage protection on the low-voltage side, overcurrent protection, overtemperature protection and communication protection, and can automatically recover work after the protection is released.
The energy management system is used for controlling the energy storage DCDC converter and the bidirectional DCAC converter according to the direct current power and the electric power of the direct current load so as to store redundant direct current electric energy into the energy storage battery when the direct current power is larger than the electric power and feed the redundant direct current electric energy back into the power grid system when the energy storage battery cannot store the electric energy, or supply the electric energy stored in the energy storage battery into the direct current bus when the direct current power is smaller than the electric power and combine the electric energy of the power grid system into the direct current bus when the energy storage battery cannot supply the electric energy.
It can be understood that when grid connection is performed, the direct current bus is established by the bidirectional DCAC converter, the power generated by the photovoltaic module is directly stored in the energy storage battery or is supplied to the direct current lighting load, redundant electric energy can be fed back to the power grid through the bidirectional DCAC, if the power generated by the photovoltaic module is smaller than the power used by the direct current load, the electric energy stored by the storage battery is preferentially used, and if the power of the battery is too low, the grid connection absorbs energy from the power grid through the bidirectional DCAC converter to supply power to the direct current load.
When the direct current bus is off-grid, the energy storage DCDC converter is used for establishing a direct current bus, the photovoltaic assembly is used for generating power and the energy storage battery is used for supplying power for the direct current load, and if the photovoltaic power generation power is larger than the power used by the direct current illumination load, the redundant electric energy charges the storage battery.
The photovoltaic module is connected with a direct current bus of 750V through a photovoltaic DCDC converter, and maximum power tracking of the photovoltaic module is realized by adopting a DCDC parallel connection mode of multiple branches. The 750V direct current bus is established by an energy storage DCDC converter, and the battery of the energy storage DCDC converter is connected with an energy storage battery in a side connection mode. The direct current side of the bidirectional DCAC converter is connected with a direct current bus of 750V, and the alternating current side is connected with a commercial power grid. The direct current load supplies power for 220V, and the load DCDC converter is used for carrying out 750V step-down.
The photovoltaic module generates electricity and directly stores in a battery or supplies power for a direct current load, redundant electric energy can be fed back to a power grid through a grid-connected bidirectional inverter, if the photovoltaic power generation power is smaller than the electric power for the direct current illumination load, the electric energy stored in the storage battery is preferentially used, and if the electric quantity of the battery is too low, the grid-connected bidirectional inverter absorbs energy from the power grid to charge the storage battery. The system has off-grid operation function, and when the power grid recovers power supply, the grid-connected bidirectional inverter is automatically put into operation without human intervention.
According to the technical scheme, the photovoltaic module is connected with the direct current bus through the photovoltaic DCDC converter, the energy storage battery is connected with the direct current bus through the energy storage DCDC converter, the direct current bus is connected with the power grid system through the bidirectional DCAC converter, and the direct current bus is connected with the direct current load through the load DCDC converter; the energy management system controls the energy storage DCDC converter and the bidirectional DCAC converter according to the direct current power and the electric power of the direct current load, so that the direct current power is larger than the electric power, redundant direct current electric energy is stored in the energy storage battery, electric energy cannot be stored in the energy storage battery, redundant direct current is fed back to the power grid system, or the direct current power is smaller than the electric power, electric energy stored in the energy storage battery is provided to the direct current bus, electric energy cannot be provided in the energy storage battery, and electric energy of the power grid system is integrated into the direct current bus. Not only can provide electric energy through photovoltaic module, can also store the energy storage battery with surplus electric energy, and then can supply power for the direct current load through the energy storage battery, avoid frequently switching between being incorporated into the power networks and from the net switching, and then avoid the unable timely adjustment power supply volume of grid system, lead to grid system's electric shock.
In one possible implementation manner, the photovoltaic DCDC converter is specifically configured to convert the electrical energy provided by the photovoltaic module into direct current with maximum power tracking by:
acquiring the temperature of each solar cell panel in the photovoltaic module;
Determining the output current of each solar panel according to the temperature and the energy conversion efficiency of the solar panel;
Predicting the predicted output current at the next moment according to the output current at the current moment and the corresponding current change step length, wherein the current change step length is determined according to the illumination intensity of seasons and the illumination intensity change of each day in each season;
Typically, the value of the current change step is determined from the intensity of the illumination in the season, and the direction of the current change is determined from the intensity of the illumination on each day in each season.
For example, the current change steps in summer and autumn are larger than the current change step in spring, which is larger than the current change step in winter, the current change step in the morning until 3 pm is the current increasing direction, and the current change step in the afternoon after 3 pm is the current decreasing direction.
Carrying out current correction on the output current through the predicted output current;
In the embodiment of the disclosure, the average value of the output current and the predicted output current can be calculated to obtain the corrected current, and the gain coefficient of the first-order current filter can be adjusted through the predicted output current, so that the output current is filtered according to the first-order current filter with the adjusted gain coefficient of the first-order current filter, and the current correction is realized.
Obtaining maximum power tracking points of each solar panel in B and D;
and (3) bringing the maximum power tracking points of the B and the D and the rectified current into a preset calculation formula, determining the output power of the maximum power tracking corresponding to the photovoltaic module, and controlling the photovoltaic DCDC converter to convert the electric energy provided by the photovoltaic module into direct current by using the output power of the maximum power tracking.
In one possible implementation manner, the preset calculation formula is:
；
Wherein V MPPT is the voltage of maximum power tracking, I MPPT is the current after deviation correction, J B and J D are the maximum power tracking points of B and D respectively, I SC is the preset short-circuit current of the solar panel, V OC is the preset open-circuit voltage of the implementation solar panel, and P MPPT is the output power of maximum power tracking.
In one possible implementation, the energy management system is specifically configured to:
Controlling the energy storage DCDC converter to reduce the voltage and outputting the direct current electric energy on the direct current bus to the energy storage battery under the condition that the direct current electric power is larger than the electric power of the direct current load; and is combined with the other components of the water treatment device,
And under the condition that the energy storage battery cannot store electric energy, controlling the bidirectional DCAC converter to convert the direct-current electric energy on the direct-current bus into alternating current and feed the alternating current back to the power grid system.
In one possible implementation, the energy management system is specifically configured to:
Under the condition that the direct-current power is smaller than the power consumption of the direct-current load, controlling the energy storage DCDC converter to boost and outputting the direct-current electric energy stored in the energy storage battery to the direct-current bus; and is combined with the other components of the water treatment device,
And under the condition that the residual electric quantity of the energy storage battery is lower than a preset electric quantity threshold value, controlling the bidirectional DCAC converter to convert alternating current on the power grid system into direct current and outputting the direct current to the direct current bus.
In one possible implementation, the energy management system is further configured to:
And under the condition that the photovoltaic module does not output electric energy to the direct current, the direct current load stops using electric energy, and the current moment is in the electricity consumption valley period of the power grid system, the bidirectional DCAC converter is controlled to convert alternating current on the power grid system into direct current to be output to the direct current bus, and the energy storage DCDC converter is controlled to step down to output the direct current electric energy on the direct current bus to the energy storage battery.
Therefore, the energy storage battery can be charged by reasonably utilizing the power grid system in the electricity consumption valley period of the power grid system, and the power impact on the power grid system caused by grid-connected charging without selecting the opportunity is avoided.
The embodiment of the disclosure also provides a control method of a light-storage direct-current flexible direct-current micro-grid system, which is applied to an energy management system, wherein the energy management system is respectively in communication connection with a photovoltaic DCDC converter, an energy-storage DCDC converter, a bidirectional DCAC converter and a load DCDC converter in the light Chu Zhirou direct-current micro-grid system, a photovoltaic component in the light Chu Zhirou direct-current micro-grid system is connected with a direct-current bus through the photovoltaic DCDC converter, an energy-storage battery in the light Chu Zhirou direct-current micro-grid system is connected with the direct-current bus through the energy-storage DCDC converter, the direct-current bus is connected with a grid system through the bidirectional DCAC converter, and the direct-current bus is connected with a direct-current load through the load DCDC converter, as shown in fig. 2, and the control method of the light Chu Zhirou direct-current micro-grid system comprises:
in step S21, the photovoltaic DCDC converter is controlled to track with maximum power, convert the electric energy provided by the photovoltaic module into direct current, and output the direct current to the direct current bus;
in step S22, the energy storage DCDC converter and the bidirectional DCAC converter are controlled according to the dc power and the power consumption of the dc load, so as to store the redundant dc power to the energy storage battery when the dc power is greater than the power consumption, and feed the redundant dc power back to the power grid system when the energy storage battery cannot store the power consumption, or supply the power stored in the energy storage battery to the dc bus when the dc power is less than the power consumption, and to incorporate the power of the power grid system to the dc bus when the energy storage battery cannot supply the power consumption.
In one possible implementation manner, referring to fig. 3, in step S21, the controlling the photovoltaic DCDC converter to track at maximum power and convert the electrical energy provided by the photovoltaic module into direct current and output the direct current to the direct current bus includes:
In step S211, the temperature of each solar panel in the photovoltaic module is obtained;
In step S212, determining an output current of each solar panel according to the temperature and the energy conversion efficiency of the solar panel;
in step S213, the predicted output current at the next time is predicted according to the output current at the current time and the corresponding current change step, where the current change step is determined according to the illumination intensity in the season and the illumination intensity change of each day in each season;
in step S214, performing current correction on the output current through the predicted output current;
in step S215, the maximum power tracking point of each solar panel in B and D is obtained;
In step S216, the maximum power tracking points of B and D and the rectified current are brought into a preset calculation formula, the output power of the maximum power tracking corresponding to the photovoltaic module is determined, the photovoltaic DCDC converter is controlled to convert the electric energy provided by the photovoltaic module into direct current by using the output power of the maximum power tracking, and the direct current is output to the direct current bus.
In a possible implementation manner, in step S22, the controlling the energy storage DCDC converter and the bidirectional DCAC converter according to the direct current power and the electric power of the direct current load includes:
Controlling the energy storage DCDC converter to reduce the voltage and outputting the direct current electric energy on the direct current bus to the energy storage battery under the condition that the direct current electric power is larger than the electric power of the direct current load; under the condition that the energy storage battery cannot store electric energy, the bidirectional DCAC converter is controlled to convert the direct-current electric energy on the direct-current bus into alternating current and feed the alternating current back to the power grid system;
Or alternatively
Under the condition that the direct-current power is smaller than the power consumption of the direct-current load, controlling the energy storage DCDC converter to boost and outputting the direct-current electric energy stored in the energy storage battery to the direct-current bus; and under the condition that the residual electric quantity of the energy storage battery is lower than a preset electric quantity threshold value, controlling the bidirectional DCAC converter to convert alternating current on the power grid system into direct current and output the direct current to the direct current bus.
In one possible implementation manner, the control method of the optical Chu Zhirou direct-current micro-grid system further includes:
And under the condition that the photovoltaic module does not output electric energy to the direct current, the direct current load stops using electric energy, and the current moment is in the electricity consumption valley period of the power grid system, the bidirectional DCAC converter is controlled to convert alternating current on the power grid system into direct current to be output to the direct current bus, and the energy storage DCDC converter is controlled to step down to output the direct current electric energy on the direct current bus to the energy storage battery.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the above embodiments, and various changes, modifications, substitutions and alterations can be made to these embodiments within the scope of the technical idea of the present disclosure, which all fall within the scope of protection of the present disclosure.
It should be further noted that, where specific features described in the foregoing embodiments are combined in any suitable manner, they should also be regarded as disclosure of the present disclosure, and various possible combinations are not separately described in order to avoid unnecessary repetition. The technical scope of the present application is not limited to the contents of the specification, and must be determined according to the scope of claims.
Claims (10)
1. An optical storage direct-soft direct-current micro-grid system, characterized in that the optical Chu Zhirou direct-current micro-grid system comprises:
the system comprises a photovoltaic assembly, a photovoltaic DCDC converter, a direct current bus, an energy storage battery, an energy storage DCDC converter, a bidirectional DCAC converter, a load DCDC converter and an energy management system;
the photovoltaic module is connected with the direct current bus through the photovoltaic DCDC converter, the energy storage battery is connected with the direct current bus through the energy storage DCDC converter, the direct current bus is connected with a power grid system through the bidirectional DCAC converter, and the direct current bus is connected with a direct current load through the load DCDC converter;
The energy management system is respectively in communication connection with the photovoltaic DCDC converter, the energy storage DCDC converter, the bidirectional DCAC converter and the load DCDC converter;
The photovoltaic DCDC converter is used for converting electric energy provided by the photovoltaic assembly into direct current by maximum power tracking and outputting the direct current to the direct current bus;
The energy management system is used for controlling the energy storage DCDC converter and the bidirectional DCAC converter according to the direct current power and the electric power of the direct current load so as to store redundant direct current electric energy into the energy storage battery when the direct current power is larger than the electric power and feed the redundant direct current electric energy back into the power grid system when the energy storage battery cannot store the electric energy, or supply the electric energy stored in the energy storage battery into the direct current bus when the direct current power is smaller than the electric power and combine the electric energy of the power grid system into the direct current bus when the energy storage battery cannot supply the electric energy.
2. The light Chu Zhirou direct current microgrid system according to claim 1, wherein the photovoltaic DCDC converter is specifically configured to convert electrical energy provided by the photovoltaic module into direct current with maximum power tracking by:
acquiring the temperature of each solar cell panel in the photovoltaic module;
Determining the output current of each solar panel according to the temperature and the energy conversion efficiency of the solar panel;
Predicting the predicted output current at the next moment according to the output current at the current moment and the corresponding current change step length, wherein the current change step length is determined according to the illumination intensity of seasons and the illumination intensity change of each day in each season;
carrying out current correction on the output current through the predicted output current;
Obtaining maximum power tracking points of each solar panel in B and D;
and (3) bringing the maximum power tracking points of the B and the D and the rectified current into a preset calculation formula, determining the output power of the maximum power tracking corresponding to the photovoltaic module, and controlling the photovoltaic DCDC converter to convert the electric energy provided by the photovoltaic module into direct current by using the output power of the maximum power tracking.
3. The light Chu Zhirou dc micro grid system according to claim 2, wherein the predetermined calculation formula is:
；
Wherein V MPPT is the voltage of maximum power tracking, I MPPT is the current after deviation correction, J B and J D are the maximum power tracking points of B and D respectively, I SC is the preset short-circuit current of the solar panel, V OC is the preset open-circuit voltage of the implementation solar panel, and P MPPT is the output power of maximum power tracking.
4. The light Chu Zhirou direct current microgrid system according to any one of claims 1-3, wherein the energy management system is specifically configured to:
Controlling the energy storage DCDC converter to reduce the voltage and outputting the direct current electric energy on the direct current bus to the energy storage battery under the condition that the direct current electric power is larger than the electric power of the direct current load; and is combined with the other components of the water treatment device,
And under the condition that the energy storage battery cannot store electric energy, controlling the bidirectional DCAC converter to convert the direct-current electric energy on the direct-current bus into alternating current and feed the alternating current back to the power grid system.
5. The light Chu Zhirou direct current microgrid system according to any one of claims 1-3, wherein the energy management system is specifically configured to:
Under the condition that the direct-current power is smaller than the power consumption of the direct-current load, controlling the energy storage DCDC converter to boost and outputting the direct-current electric energy stored in the energy storage battery to the direct-current bus; and is combined with the other components of the water treatment device,
And under the condition that the residual electric quantity of the energy storage battery is lower than a preset electric quantity threshold value, controlling the bidirectional DCAC converter to convert alternating current on the power grid system into direct current and outputting the direct current to the direct current bus.
6. The light Chu Zhirou direct current microgrid system of claim 5, wherein said energy management system is further configured to:
And under the condition that the photovoltaic module does not output electric energy to the direct current, the direct current load stops using electric energy, and the current moment is in the electricity consumption valley period of the power grid system, the bidirectional DCAC converter is controlled to convert alternating current on the power grid system into direct current to be output to the direct current bus, and the energy storage DCDC converter is controlled to step down to output the direct current electric energy on the direct current bus to the energy storage battery.
7. The control method of the light-storage direct-current flexible direct-current micro-grid system is characterized by being applied to an energy management system, wherein the energy management system is respectively in communication connection with a photovoltaic DCDC converter, an energy storage DCDC converter, a bidirectional DCAC converter and a load DCDC converter in the light Chu Zhirou direct-current micro-grid system, a photovoltaic component in the light Chu Zhirou direct-current micro-grid system is connected with a direct-current bus through the photovoltaic DCDC converter, an energy storage battery in the light Chu Zhirou direct-current micro-grid system is connected with the direct-current bus through the energy storage DCDC converter, the direct-current bus is connected with a grid system through the bidirectional DCAC converter, the direct-current bus is connected with a direct-current load through the load DCDC converter, and the control method of the light Chu Zhirou direct-current micro-grid system comprises the following steps:
controlling the photovoltaic DCDC converter to track with maximum power, converting electric energy provided by the photovoltaic module into direct current, and outputting the direct current to the direct current bus;
And controlling the energy storage DCDC converter and the bidirectional DCAC converter according to the direct current power and the electric power of the direct current load so as to store redundant direct current electric energy into the energy storage battery under the condition that the direct current power is larger than the electric power, and feed the redundant direct current electric energy back to the power grid system under the condition that the energy storage battery cannot store the electric energy, or supply the electric energy stored in the energy storage battery to the direct current bus under the condition that the direct current power is smaller than the electric power, and integrate the electric energy of the power grid system into the direct current bus under the condition that the energy storage battery cannot supply the electric energy.
8. The method for controlling a dc micro-grid system according to claim 7, wherein controlling the photovoltaic DCDC converter to track at maximum power converts electrical energy provided by the photovoltaic module into dc power, and outputs the dc power to the dc bus comprises:
acquiring the temperature of each solar cell panel in the photovoltaic module;
Determining the output current of each solar panel according to the temperature and the energy conversion efficiency of the solar panel;
Predicting the predicted output current at the next moment according to the output current at the current moment and the corresponding current change step length, wherein the current change step length is determined according to the illumination intensity of seasons and the illumination intensity change of each day in each season;
carrying out current correction on the output current through the predicted output current;
Obtaining maximum power tracking points of each solar panel in B and D;
And (3) bringing the maximum power tracking points of the B and the D and the rectified current into a preset calculation formula, determining the output power of the maximum power tracking corresponding to the photovoltaic module, controlling the photovoltaic DCDC converter to convert the electric energy provided by the photovoltaic module into direct current by using the output power of the maximum power tracking, and outputting the direct current to the direct current bus.
9. The method for controlling an optical Chu Zhirou dc micro-grid system according to claim 7 or 8, wherein the controlling the energy storage DCDC converter and the bidirectional DCAC converter according to the dc power and the power consumption of the dc load includes:
Controlling the energy storage DCDC converter to reduce the voltage and outputting the direct current electric energy on the direct current bus to the energy storage battery under the condition that the direct current electric power is larger than the electric power of the direct current load; under the condition that the energy storage battery cannot store electric energy, the bidirectional DCAC converter is controlled to convert the direct-current electric energy on the direct-current bus into alternating current and feed the alternating current back to the power grid system;
Or alternatively
Under the condition that the direct-current power is smaller than the power consumption of the direct-current load, controlling the energy storage DCDC converter to boost and outputting the direct-current electric energy stored in the energy storage battery to the direct-current bus; and under the condition that the residual electric quantity of the energy storage battery is lower than a preset electric quantity threshold value, controlling the bidirectional DCAC converter to convert alternating current on the power grid system into direct current and output the direct current to the direct current bus.
10. The method for controlling an optical Chu Zhirou dc micro-grid system according to claim 9, wherein the method for controlling an optical Chu Zhirou dc micro-grid system further comprises:
And under the condition that the photovoltaic module does not output electric energy to the direct current, the direct current load stops using electric energy, and the current moment is in the electricity consumption valley period of the power grid system, the bidirectional DCAC converter is controlled to convert alternating current on the power grid system into direct current to be output to the direct current bus, and the energy storage DCDC converter is controlled to step down to output the direct current electric energy on the direct current bus to the energy storage battery.
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