CN118249399A

CN118249399A - High-power hybrid power supply system based on direct current networking and control method thereof

Info

Publication number: CN118249399A
Application number: CN202410670338.1A
Authority: CN
Inventors: 裴畅荣; 潘勃; 陈新亮; 越恭; 郭俊青; 赵银飞; 郑维礼; 李小志
Original assignee: Shanxi Dehui Zhongtian Construction Engineering Co ltd; Taizhong Shenzhen International Heavy Equipment Technology Co ltd; Shanxi Construction Investment Group Co Ltd
Current assignee: Shanxi Dehui Zhongtian Construction Engineering Co ltd; Taizhong Shenzhen International Heavy Equipment Technology Co ltd; Shanxi Construction Investment Group Co Ltd
Priority date: 2024-05-28
Filing date: 2024-05-28
Publication date: 2024-06-25
Anticipated expiration: 2044-05-28
Also published as: CN118249399B

Abstract

The application relates to the technical field of power supply, and discloses a high-power hybrid power supply system based on direct current networking and a control method thereof, wherein the high-power hybrid power supply system comprises a direct current output cabinet, an inverter, a filter, an isolation transformer, a system output power distribution cabinet, an energy storage module, a data acquisition module and a controller; the input end of the direct current output cabinet is used for being connected with an external input power supply, the inverter is connected between the output end of the direct current output cabinet and the filter, the isolation transformer is connected between the filter and the input end of the system output power distribution cabinet, the output end of the system output power distribution cabinet is used for being connected with an electric load, and the energy storage module is connected to a direct current bus between the direct current output cabinet and the inverter; the controller is used for controlling the output of the direct current output cabinet and the charge and discharge of the energy storage module according to the collected state data. And when the load is smaller, surplus electric energy is stored, and when the load is larger, the electric energy is released, so that the system does not need to configure input capacity according to peak power, the power supply efficiency and the system load rate are improved, and the use cost is reduced.

Description

High-power hybrid power supply system based on direct current networking and control method thereof

Technical Field

The application relates to the technical field of power supply, in particular to a high-power hybrid power supply system based on direct current networking and a control method thereof.

Background

Often, a large number of engineering equipment is involved in engineering construction projects, and the demand for electric power is large. The traditional method for solving the problem of the electric power gap mainly adopts the following two methods: the capacity of the power grid is expanded or a diesel generator is additionally adopted for power generation, and the power supply system is configured according to peak power requirements required by projects in the two methods. However, the project involved in engineering construction is complicated and the equipment is various, and the method has the characteristics of large load, random load change and far more peak power than average power. Taking a pile driver which is commonly used in the current period of construction of engineering construction projects as an example, due to limited construction period, most engineering construction projects often need a plurality of pile drivers to operate simultaneously, the external power capacity requirement is large, the temporary power supply facility capacity of engineering construction often has difficulty in meeting the power requirement of the plurality of pile drivers for simultaneous construction, the requirements of different geological conditions on pile driving load power are different, and the power consumption is larger along with the deeper of the depth of driving precast piles. For example, in a three-stage reconstruction and expansion project of an international airport, pile foundation engineering is designed to drive 3 concrete precast piles into each pile hole, 3 hydraulic pile drivers are adopted for construction, a power grid power supply transformer with capacity of 630Kva is used for providing power, after pile driving is started, tripping phenomenon occurs, and the measurement shows that the load of the pile lifting process after the 3 rd precast pile is completely driven reaches 526Kw maximally, and the capacity of the power grid power supply transformer cannot meet the peak power requirement. Pile foundation construction process of driving 3 precast piles into each pile hole is divided into: the 6 processes of driving the first pile, welding, driving the second pile, welding, driving the third pile, and lifting the piles were measured, and the electric power and duration of each process of driving the pile using the hydraulic pile driver for the project were shown in fig. 1. Because the displacement, precast pile hanging, alignment and the like in the piling process consume time, each hydraulic pile driver works for 10 hours per day to complete 3 pile hole construction, and 3 hydraulic pile drivers complete 9 pile hole construction per day, the average power during piling operation is calculated to be 256.5kW, and therefore the peak power 1578kW and the average power 256.5kW of the 3 hydraulic pile drivers in the project are greatly different. If the configuration is carried out according to the peak power demand, the average power of the project is low, so that the load rate of the whole power supply equipment is very low, the cost is increased, the resource waste is easy to cause, and the requirement of green sustainable development is not met; if the configuration is carried out according to the average power, the power supply requirement cannot be met when the power requirement reaches the peak value, and the project progress is delayed. Therefore, the conventional method of peak power demand configuration cannot meet the demands of such engineering projects with large loads, random load changes, and peak power far greater than average power.

Disclosure of Invention

In view of the above, the present invention aims to provide a high-power hybrid power supply system based on dc networking and a control method thereof, which utilize the dc networking to conveniently control and the fast charge and discharge capability of an energy storage module, store surplus electric energy when the load is small, and release the stored electric energy fast when the load is large, so that the power supply system does not need to configure the input capacity according to the peak power, thereby improving the power supply efficiency and the system load rate, and reducing the use cost.

In order to achieve the above object, the following technical scheme is adopted:

in a first aspect, an embodiment of the present application provides a high-power hybrid power supply system based on dc networking, including: the system comprises a direct current output cabinet, an inverter, a filter, an isolation transformer, a system output power distribution cabinet, an energy storage module, a data acquisition module and a controller;

The input end of the direct current output cabinet is used for being connected with an external input power supply, the inverter is connected between the output end of the direct current output cabinet and the filter, the isolation transformer is connected between the filter and the input end of the system output power distribution cabinet, the output end of the system output power distribution cabinet is used for being connected with an electric load, and the energy storage module is connected to a direct current bus between the direct current output cabinet and the inverter through a high-voltage direct current contactor;

The data acquisition module is used for acquiring state data in the running process of the system;

The controller is used for controlling the output of the direct current output cabinet and the charge and discharge of the energy storage module according to the state data, and is connected with the control end of the high-voltage direct current contactor and controls the opening and closing of the high-voltage direct current contactor.

Optionally, the data acquisition module includes: the first ammeter is arranged at the output end of the direct-current output cabinet, and the second ammeter is arranged at the output end of the system output power distribution cabinet.

Optionally, the energy storage module uses a carbon-based capacitor as an energy storage material.

Optionally, the input end of the direct current output cabinet is provided with two incoming line breakers, the two incoming line breakers are mechanically interlocked, and the two incoming line breakers are respectively used for connecting a generator and a power grid power supply transformer.

In a second aspect, an embodiment of the present application provides a control method of a high-power hybrid power supply system based on a dc network as in the first aspect, including:

Detecting the real-time power P of an electric load, and comparing the real-time power P of the electric load with the rated output power P0 of a direct current output cabinet and the peak output power P1 of an energy storage module;

detecting the charge state E of the energy storage module;

When P < P0, if E is smaller than a first upper charge limit value, detecting the current DC bus voltage, adjusting the set voltage of the DC output cabinet to be higher than the DC bus voltage, controlling the DC output cabinet to output with rated output power for supplying power to the electric load and charging the energy storage module, otherwise, adjusting the set voltage of the DC output cabinet to be consistent with the DC bus voltage, and controlling the DC output cabinet to output in a variable power mode along with the electric load;

When P0 is more than or equal to P and less than or equal to P0+P1, if E is more than a first lower limit value of charge, detecting the current DC bus voltage, adjusting the setting voltage of the DC output cabinet to be lower than the DC bus voltage, controlling the DC output cabinet to output with rated output power so that the DC output cabinet and the energy storage module supply power to the power utilization load together, otherwise, generating load reduction operation prompt information;

When P > P0+P1, the system is controlled to stop supplying power to the electric load.

Optionally, when p0.ltoreq.p0.ltoreq.p0+p1, the method further includes:

And if E is smaller than the second lower charging limit value, the high-voltage direct-current contactor is controlled to be disconnected and the system is controlled to stop supplying power to the power utilization load, and after the system is determined to stop supplying power to the power utilization load, the high-voltage direct-current contactor is controlled to be closed, so that the energy storage module is charged.

Optionally, when the input power source is a generator, before performing the step corresponding to the condition "P < P0", the method further includes: p is determined to be less than or equal to 0.5P0;

when P is determined to be less than or equal to 0.5P0, judging whether E is smaller than a first charge lower limit value;

If E is not smaller than the first charge lower limit value, controlling the direct current output cabinet to stop outputting, and independently supplying power to the power utilization load through the energy storage module;

If E is smaller than the first charge lower limit value, detecting the current DC bus voltage, adjusting the setting voltage of the DC output cabinet to be higher than the DC bus voltage, controlling the DC output cabinet to output with rated output power so as to supply power to the electric load and charge the energy storage module, and controlling the DC output cabinet to stop outputting until E is larger than the first charge upper limit value, and independently supplying power to the electric load through the energy storage module.

Optionally, in the process of charging the energy storage module, the method further includes:

And when E is not greater than the charging mode threshold, controlling the direct current output cabinet to output at a rated output power constant current, and when E is greater than the charging mode threshold, controlling the direct current output cabinet to output at a rated output power constant voltage.

Optionally, the method further comprises:

Acquiring state data in the running process of the system acquired at fixed time, wherein each group of state data comprises: the data acquisition time, the real-time voltage of the energy storage module, the load side electric quantity and the direct current input side electric quantity;

Determining a plurality of deep charging periods and deep discharging periods according to the acquired state data, wherein one deep charging period refers to a process that the state of charge of the energy storage module is increased from not more than 40% to not less than 90% and the energy storage module is not discharged, one deep discharging period refers to a process that the state of charge of the energy storage module is reduced from not less than 90% to not more than 40% and the energy storage module is not charged, and the state of charge E is determined according to the real-time voltage, the discharge cut-off voltage and the charge cut-off voltage of the energy storage module;

Determining a charging performance index according to state data in a plurality of deep charging periods, and adjusting the charging cut-off voltage according to the charging performance index;

And determining a discharge performance index according to state data in a plurality of deep discharge periods, and adjusting the discharge cut-off voltage according to the discharge performance index.

Optionally, the charging performance index includes at least one of: designating a charge increment, designating a charge duration and a charge anomaly number; the specified charge increment is the charge increment of the energy storage module after being charged for a first specified duration in a deep charging period, the charge increment is determined according to the difference value between the electric quantity of the load side and the electric quantity of the direct current input side, the specified charge duration is the duration required when the state of charge of the energy storage module is increased from the first specified value to a second specified value in the deep charging period, and the abnormal charge is the duration that the state of charge is not increased in the deep charging period exceeds a preset duration;

the discharge performance index comprises at least one of the following: specifying a charge decrement and specifying a discharge time period; the specified charge decrement refers to a charge increment of the energy storage module after discharging for a second specified duration in a deep discharging period, the charge increment is determined according to a difference value between the load side electric quantity and the direct current input side electric quantity, and the specified discharging duration refers to a duration required when the state of charge of the energy storage module is reduced from the second specified value to the first specified value in the deep discharging period.

The beneficial effects of the application are as follows: according to the high-power hybrid power supply system based on the direct current networking and the control method thereof, the direct current output cabinet is used for converting alternating current into direct current which is controllably output, and the direct current is converged with the energy storage module and then drives the load, so that the surplus electric energy is stored when the load is small and the stored electric energy is quickly released when the load is large by utilizing the quick charge and discharge capability of the energy storage module, the peak power output by the system is greatly improved, and the project does not need to configure the input capacity according to the peak power, so that the power supply efficiency and the system load rate are improved, and the use cost is reduced. In addition, the input power supply drives the load through the direct current output cabinet, and the output power of the direct current output cabinet is controlled, so that the input power supply at the front end can not be overloaded, the change of the load at the rear end has no disturbance to the input power supply, and the power supply is ensured to be safer and more stable. Compared with the alternating current networking which needs to regulate and control factors such as voltage, phase and phase sequence, the direct current networking mode is relatively convenient to regulate and control.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application. In the drawings:

FIG. 1 is a data graph of power and duration during various processes of piling using a hydraulic pile driver;

Fig. 2 is a schematic structural diagram of the high-power hybrid power supply system based on the direct current networking;

FIG. 3 is a schematic flow chart of a control method of the DC networking-based high-power hybrid power supply system according to the present invention;

FIG. 4 is a schematic diagram of a second flow chart of a control method of the DC networking-based high-power hybrid power supply system of the invention;

FIG. 5 is a schematic diagram of a third flow chart of a control method of the DC networking-based high-power hybrid power supply system;

Fig. 6 is a flow chart of adaptively adjusting the charge and discharge cut-off voltage of the energy storage module according to the present invention.

In the figure: 1. a direct current output cabinet; 2. an energy storage module; 3. an inverter; 4. a filter; 5. an isolation transformer; 6. a system output power distribution cabinet; 7. a data acquisition module; 8. a controller; 9. a high voltage dc contactor; 10. a wire inlet circuit breaker; 11. a generator; 12. a grid supply transformer; 13. and (5) using an electric load.

Detailed Description

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.

In order that those skilled in the art will better understand the present application, a technical solution in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present application, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.

Referring to fig. 2, the high-power hybrid power supply system based on the direct current networking provided by the embodiment of the application at least comprises the following parts: the system comprises a direct current output cabinet 1, an energy storage module 2, an inverter 3, a filter 4, an isolation transformer 5, a system output power distribution cabinet 6, a data acquisition module 7 and a controller 8. The input end of the direct current output cabinet 1 is used for being connected with an external input power supply (a generator 11 and a power grid power supply transformer 12), the inverter 3 is connected between the output end of the direct current output cabinet 1 and the filter 4, the isolation transformer 5 is connected between the filter 4 and the input end of the system output power distribution cabinet 6, the output end of the system output power distribution cabinet 6 is used for being connected with an electric load 13, and the energy storage module 2 is connected to a direct current bus between the direct current output cabinet 1 and the inverter 3 through a high-voltage direct current contactor 9. The data acquisition module 7 is used for acquiring state data in the running process of the system. The controller 8 is used for controlling the output of the direct current output cabinet 1 and the charge and discharge of the energy storage module 2 according to the state data. The controller 8 is connected with the control end of the high-voltage direct-current contactor 9, and the controller 8 can realize the opening and closing control of the high-voltage direct-current contactor 9.

The data acquisition module 7 acquires state data in the running process of the system in real time and sends the state data to the controller 8. The data acquisition module 7 may include various types of sensors disposed at various acquisition objects in the system, the type of sensor being selected based on the type of data acquired. For example, in order to monitor the dc bus voltage in real time, a voltmeter may be provided at the output end of the dc output cabinet 1; in order to detect the electric quantity at the direct current input side and the direct current bus voltage, a first ammeter can be arranged at the output end of the direct current output cabinet 1; in order to detect the real-time power and the load-side power of the power consumer 13, a second electric meter may be provided at the output of the system output power distribution cabinet 6.

The controller 8 is connected with the data acquisition module 7 to acquire the state data acquired by the data acquisition module 7 in real time, and generates control instructions for all parts of the system according to the acquired state data so as to dynamically adjust the power supply mode according to the input power supply and the load condition. The controller 8 is also connected to the controlled object, and controls the controlled object by sending a corresponding control command to the controlled object. For example, when the controlled object is the dc output cabinet 1, the controller 8 may adjust the output mode (e.g. output at rated power and output at variable power) of the dc output cabinet 1 and set the internal parameters of the dc output cabinet 1 by sending a corresponding instruction to the dc output cabinet 1. For more specific control methods reference is made to the following embodiments.

The direct current output cabinet 1 can convert the input alternating current into direct current for output, the direct current output cabinet 1 can adjust the output voltage, current and power, and the conversion efficiency is very high. The output end of the direct current output cabinet 1 and the energy storage module 2 are connected into a direct current bus bar to be converged and then connected to the input end of the inverter 3, the inverter 3 converts direct current into alternating current to be output, the output end of the inverter 3 is connected to the input end of the filter 4, the filter 4 further optimizes fundamental wave and harmonic wave of the inverted alternating current, the output end of the filter 4 is connected to the input end of the isolation transformer 5, three-phase alternating current is converted into three-phase four-wire alternating current of 380V and 50Hz after passing through the isolation transformer 5, and finally power is supplied to the electric load 13 through the system output power distribution cabinet 6. In the running process of the system, when the power consumption load 13 is smaller, the direct current output cabinet 1 supplies power to the load independently, and meanwhile, the energy storage module 2 rapidly stores surplus electric energy output by the direct current output cabinet 1; when the power consumption load 13 becomes large, the energy storage module 2 rapidly outputs stored electric energy, and the electric energy and the direct current output cabinet 1 provide high-power consumption requirements, so that the system achieves stable balance load.

According to the high-power hybrid power supply system based on the direct current networking, the direct current output cabinet 1 converts alternating current into direct current which is controllably output, the direct current is converged with the energy storage module 2 and then drives the load, so that the surplus electric energy is stored when the load is small by utilizing the rapid charge and discharge capability of the energy storage module 2, the stored electric energy is rapidly released when the load is large, the peak power output by the system is greatly improved, the power supply system does not need to configure the input capacity according to the peak power, the power supply efficiency and the system load rate are improved, and the use cost is reduced. In addition, the input power supply drives the load through the direct current output cabinet 1, and the output power of the direct current output cabinet 1 is controlled, so that the input power supply at the front end can not be overloaded, the load change at the rear end has no disturbance to the input power supply, and the power supply is ensured to be safer and more stable. And compared with the alternating current networking which needs to regulate and control factors such as voltage, phase and phase sequence, the regulation and control of the direct current networking mode are more convenient.

With reference to fig. 2, in one possible embodiment, two incoming circuit breakers 10 are provided at the input of the dc output cabinet 1, the two incoming circuit breakers 10 being mechanically interlocked, the two incoming circuit breakers 10 being respectively for connecting the generator 11 and the grid supply transformer 12. When the power is supplied by the power grid, the power supply of the power grid power supply transformer 12 can be used as an input power supply; when the power grid is inconvenient to supply power, the generator 11 can be used as an input power source. The output end of the power grid power supply transformer 12 or the generator 11 (such as a diesel generator) is connected to the incoming line breaker 10 at the input end of the direct current output cabinet 1, and the two incoming line breakers 10 are mechanically interlocked, so that only one path of alternating current can be ensured to be used as an electric energy input source of the power supply device at the same time.

In specific implementation, the energy storage module 2 can be formed by adopting any existing chargeable and dischargeable cell.

In an alternative embodiment, the energy storage module 2 uses a power type carbon-based capacitor as the energy storage material. The carbon-based capacitor has the energy density close to that of a lithium iron phosphate battery, but has high power density, high energy storage charge-discharge multiplying power and charge-discharge capacity of more than 5C, and is used as an energy storage power material, the speed of responding to the load change requirement is higher, and the output peak power is high. After the discharging process is completed, the carbon-based capacitor can be charged rapidly.

Because the system adopts a direct current networking mode, when the external load changes instantaneously, the carbon-based capacitor energy storage module 2 responds preferentially, and the carbon-based capacitor has multi-multiplying power discharging capability, so that the capacitor can respond to the external peak load demand quickly in a very short time, and meanwhile, the output power of the direct current output cabinet 1 is always on-line, so that the peak load capacity of the system is equivalent to the sum of the rated power of the direct current output cabinet 1 and the peak output power of the carbon-based capacitor, and the output peak power is high. Therefore, the power supply system provided by the embodiment of the application uses the power type carbon-based capacitor as the energy storage material, so that intelligent and controllable high-power output can be realized in a direct current networking mode.

In one possible implementation, the controller 8 may also be connected to a background server by wired or wireless means, and store the operation data collected during the operation of the system in a database, so as to analyze, examine, maintain and upgrade the system and authorized remote control functions according to the historical operation data.

Referring to fig. 3, the embodiment of the application also provides a control method of a high-power hybrid power supply system based on direct current networking, which can be applied to the controller 8 shown in fig. 2, and comprises the following steps:

S301, detecting real-time power P of the electric load 13 and the state of charge E of the energy storage module 2.

In particular, the real-time power P of the electric load 13 can be collected by the second electric meter.

In a specific implementation, a BMS (BATTERY MANAGEMENT SYSTEM ) may be configured for the energy storage module 2, and the state of charge of the energy storage module 2 is detected by the BMS. Referring to fig. 2, the dc bus voltage V0 may also be obtained by measuring a first ammeter disposed on the dc bus, where the dc bus voltage is equal to the battery voltage of the energy storage module 2, and the state of charge E of the energy storage module 2 is calculated according to the formula e= (V-V1)/(V2-V1) ×100%, where V represents the battery voltage of the energy storage module 2, V1 represents the discharge cut-off voltage of the energy storage module 2, and V2 represents the charge cut-off voltage of the energy storage module 2.

In practice, the real-time power of the electric load 13 and the state of charge of the energy storage module 2 are periodically detected, so as to obtain the latest data. For example, at 10 seconds or 30 seconds intervals.

S302, comparing the real-time power P of the electric load 13 with the rated output power P0 of the direct current output cabinet 1 and the peak output power P1 of the energy storage module 2; if P < P0, execute step S303; if P0 is not less than P and not more than P0+P1, executing step S304; if P > P0+P1, step S305 is performed.

The rated output power P0 of the dc output cabinet 1 and the peak output power P1 of the energy storage module 2 are data known in advance.

S303, judging whether E is smaller than the first upper charge limit value, if so, executing a step S3031, otherwise, executing a step S3032.

The first upper limit value of charge may be any value of 85% -100%. In one possible embodiment, the first upper charge limit value has a value of 90%.

S3031, detecting the current DC bus voltage, adjusting the setting voltage of the DC output cabinet 1 to be higher than the DC bus voltage, and controlling the DC output cabinet 1 to output with rated output power.

It should be noted that the set voltage is an internal adjustable parameter of the dc output cabinet 1, and the voltage output by the dc output cabinet 1 can be controlled by modifying the set voltage. Referring to fig. 2, the energy storage module 2 is directly connected to the dc bus through the high voltage dc contactor 9, and the battery voltage of the energy storage module 2 can be considered to be equal to the dc bus voltage V0. By adjusting the set voltage of the direct current output cabinet 1, a voltage difference is formed between the output end of the direct current output cabinet 1 and the energy storage module 2, so that the control of charging and discharging of the energy storage module 2 is realized.

In practice, the current dc bus voltage may be measured by a first meter disposed on the dc bus. After the controller 8 obtains the current dc bus voltage, determines a new setting voltage according to the dc bus voltage, where the value of the new setting voltage is greater than the dc bus voltage, and then sends a setting voltage adjustment instruction and an output mode adjustment instruction to the dc output cabinet 1, where the setting voltage adjustment instruction carries the value of the new setting voltage, and the output mode adjustment instruction includes an output mode that is output with rated output power. The dc output cabinet 1 adjusts the set voltage according to the received instruction and adjusts the output mode to output at the rated output power. After the direct current output cabinet 1 is set according to the instruction of the controller 8, the output power of the direct current output cabinet 1 is P0, wherein part of power meets the electricity load 13, the rest power is used for charging the energy storage module 2, and the voltage output by the direct current output cabinet 1 is higher than the voltage of the energy storage module 2, so that a pressure difference is formed, and the energy storage module 2 is charged.

In one possible implementation manner, during the process of charging the energy storage module 2 through the direct current output cabinet 1, when the charge state of the energy storage module 2 is not greater than the charging mode threshold value, controlling the direct current output cabinet 1 to output at the rated output power with constant current; when the charge state of the energy storage module 2 is larger than the charge mode threshold value, the direct current output cabinet 1 is controlled to output at a rated output power constant voltage. The charging mode threshold may be any one of 75% to 85%. In one possible embodiment, the charge mode threshold has a value of 80%. The constant-current charging mode can be selected when the state of charge is low, so that the charging speed can be increased, and the constant-voltage charging mode can be selected when the state of charge is high, so that overcharging and battery protection can be avoided.

S3032, the setting voltage of the direct current output cabinet 1 is adjusted to be consistent with the voltage of the direct current bus, and the direct current output cabinet 1 is controlled to output in a variable power mode along with the electric load 13.

In specific implementation, after determining that P < P0 and E is not less than the first upper charge limit value, the controller 8 sends a set voltage adjustment instruction and an output mode adjustment instruction to the dc output cabinet 1, where the set voltage adjustment instruction includes a voltage value of the dc bus voltage, and the output mode adjustment instruction includes an output mode that is output in a variable power mode. The dc output cabinet 1 sets the set voltage to the voltage value of the dc bus voltage according to the received instruction, and adjusts the output mode to output in the variable power mode. At this time, the voltage output by the dc output cabinet 1 is consistent with the dc bus voltage (i.e. the battery voltage of the energy storage module 2), the energy storage module 2 is neither charged nor discharged, and the dc output cabinet 1 is loaded alone, so that the dc output cabinet 1 can dynamically adjust the output power according to the change of the power load 13, but the maximum output power does not exceed the rated output power P0 of the dc output cabinet 1.

S304, judging whether E is larger than a first charge lower limit value, if so, executing step S3041, otherwise, executing step S3042.

The first lower limit value of charge may be any value from 20% to 40%. In one possible embodiment, the first lower charge limit value has a value of 30%.

S3041, detecting the current DC bus voltage, adjusting the setting voltage of the DC output cabinet 1 to be lower than the detected DC bus voltage, and controlling the DC output cabinet 1 to output at rated output power.

In specific implementation, after the controller 8 obtains the current dc bus voltage, determines a new setting voltage according to the dc bus voltage, where the value of the new setting voltage is smaller than the dc bus voltage, and then sends a setting voltage adjustment instruction and an output mode adjustment instruction to the dc output cabinet 1, where the setting voltage adjustment instruction carries the value of the new setting voltage, and the output mode adjustment instruction includes an output mode that is output with rated output power. The dc output cabinet 1 adjusts the set voltage according to the received instruction and adjusts the output mode to output at the rated output power. After the direct current output cabinet 1 is set according to the instruction of the controller 8, the output power of the direct current output cabinet 1 is P0, the voltage output by the direct current output cabinet 1 is lower than the voltage of the energy storage module 2, the energy storage module 2 starts discharging, and the direct current output cabinet 1 and the energy storage module 2 supply power to the power utilization load 13 together.

S3042, generating load-reducing operation prompt information.

When the real-time power P of the power load 13 is greater than the rated output power of the direct-current output cabinet 1 and the electric quantity of the energy storage module 2 is smaller than a certain value, the system can generate load-reducing operation prompt information for prompting operation and maintenance personnel that the system is about to be unable to normally supply power and prompting load reduction.

In one possible implementation, when p0.ltoreq.p0.ltoreq.p0+p1, if E is smaller than the second lower charging limit value, the high-voltage dc contactor 9 is controlled to be opened and the system is controlled to stop supplying power to the power utilization load 13, and after the system is determined to stop supplying power to the power utilization load 13, the high-voltage dc contactor 9 is controlled to be closed, so as to charge the energy storage module 2. The second lower charge limit value is smaller than the first lower charge limit value, and the second lower charge limit value can be any one of 5% -15%. In one possible embodiment, the second lower charge limit value has a value of 10%.

Referring to fig. 4, if E is not greater than the first lower charge limit value, step S3043 may be further executed to determine whether E is less than the second lower charge limit value, if yes, step S3044 is executed to control the high-voltage dc contactor 9 to open and the system to stop supplying power to the power load 13, and step S3045 is executed to control the high-voltage dc contactor 9 to close after determining that the system stops supplying power to the power load 13; after step S3045 is performed, the system has stopped supplying power to the power load 13, i.e. the system has returned to P < P0 at this time, returns to step S301, and enters the detection judgment of the next round, so as to charge the energy storage battery. If E is not less than the second lower charge limit value, step S3042 is performed.

Based on the steps S3043 and S3044, the power supply to the load is automatically stopped before the battery is over-discharged, and the energy storage battery is charged, so that the power utilization safety of the system is protected.

In specific implementation, when executing step S3044, an alarm prompt of low battery power can be sent out, and the operation and maintenance personnel can select to run the system after the power of the power load 13 is reduced to below P0, or load the power through the energy storage module 2 and the dc output cabinet 1 together after the energy storage module 2 finishes charging.

And S305, the control system stops supplying power to the electric load 13.

When P > P0+P1, the load of the electric load 13 exceeds the maximum power which can be output by the system, and in order to ensure the safety of the system, the controller 8 can perform overload protection and shut down the system. The operation of overload protection may include: (1) The purpose of stopping supplying power to the electric load 13 is achieved by controlling at least one of the direct current output cabinet 1, the inverter 3, the filter 4, the isolation transformer 5 and the system output power distribution cabinet 6 to stop working; (2) The high-voltage direct-current contactor 9 is disconnected to cut off the connection between the energy storage module 2 and the bus, and the energy storage module 2 stops charging and discharging.

In a specific implementation, after the controller 8 finishes executing step S305, after determining that the system stops supplying power to the power load 13, the high-voltage dc contactor 9 may be controlled to be closed, so as to charge the energy storage module 2. Or after the controller 8 has executed step S305, an alarm for system overload and shutdown may be sent, and the operation and maintenance personnel may remove the fault and reduce the load and then start the system.

In the control method of the high-power hybrid power supply system based on direct current networking provided in the above embodiment, the input power may be the power grid power supply transformer 12, or may be the generator 11, such as a diesel generator.

According to the control method of the high-power hybrid power supply system based on the direct current networking, provided by the embodiment of the application, by utilizing the rapid charge and discharge capability of the energy storage module 2, surplus electric energy is stored when the load is small, and the stored electric energy is rapidly released when the load is large, so that the power supply system does not need to configure the input capacity according to the project peak power, the power supply efficiency and the system load rate are improved, the use cost is reduced, the front-end input power supply is not directly influenced by the load change, and the power supply is safer and more stable.

In one possible implementation, when the input power source is the generator 11, in order to maintain the generator 11 at the optimal oil consumption load area to the maximum extent, the energy storage module 2 supplies power to the electricity utilization load 13 alone under the condition that P is less than or equal to 0.5P0, and only when the electric quantity of the energy storage module 2 is too low, the generator 11 supplies power to the electricity utilization load 13 through the direct current output cabinet 1, and meanwhile charges the energy storage module 2. Referring to fig. 5, the embodiment of the present application further provides a control method of a high-power hybrid power supply system based on a dc network, which can be applied to the controller 8 shown in fig. 2, and includes the following steps:

s501, detecting real-time power P of the electric load 13 and the state of charge E of the energy storage module 2.

In specific implementation, the state of charge of the energy storage module 2 can be detected through the BMS, the direct current bus voltage can be obtained through measurement of the first ammeter arranged on the direct current bus, the direct current bus voltage is equal to the battery voltage of the energy storage module 2, and the state of charge E of the energy storage module 2 is calculated according to the formula e= (V-V1)/(V2-V1) ×100%.

S502, comparing the real-time power P of the electric load 13 with the rated output power P0 of the direct current output cabinet 1 and the peak output power P1 of the energy storage module 2; if P is less than or equal to 0.5P0, executing step S506; if 0.5p0< p0, then step S503 is performed; if P0 is less than or equal to P is less than or equal to P0+P1, executing step S504; if P > P0+P1, then step S505 is performed.

S506, judging whether E is smaller than a first lower charge limit value; if yes, step S5062 is performed, otherwise step S5061 is performed.

S5061, controlling the direct current output cabinet 1 to stop outputting, and independently supplying power to the electric load 13 through the energy storage module 2.

When P is less than or equal to 0.5P0 and the charge state of the energy storage module 2 is greater than the first lower charge limit value, the controller 8 controls the direct current output cabinet 1 to stop outputting, and at the moment, the energy storage module 2 can automatically supply power to the electricity utilization load 13, and the energy storage module 2 independently supplies power to the electricity utilization load 13.

S5062, detecting the current DC bus voltage, adjusting the setting voltage of the DC output cabinet 1 to be higher than the DC bus voltage, controlling the DC output cabinet 1 to output with rated output power, and executing step S5063.

When P is less than or equal to 0.5P0 and the state of charge of the energy storage module 2 is not greater than the first lower limit value of charge, the energy storage module 2 is in a low-power state and cannot drive a load for a long time, at this time, the generator 11 at the input end is started, and the generator 11 is loaded through the direct-current output cabinet 1 and charges the energy storage module 2. At this time, since the dc output cabinet 1 operates at the rated output power, the output power of the generator 11 does not exceed the rated output power P0.

The output power of the generator 11 is only affected by the direct current output cabinet 1, and the maximum power (namely rated output power P0) output by the direct current output cabinet 1 is adjusted to be consistent with the rated power of the generator 11 in advance by adjusting the output power of the direct current output cabinet 1 to respond to the load demand, so that the generator 11 is ensured not to be overloaded.

S5063, judging whether the state of charge of the energy storage module 2 is greater than a first upper limit value of charge; if yes, go to step S5061; otherwise, the dc output cabinet 1 continues to output at the rated output power to supply power to the electric load 13 and to charge the energy storage module 2.

The first upper limit value of charge may be any value from 90% to 100%. In one possible embodiment, the first upper charge limit value has a value of 98%. In another possible embodiment, the first upper charge limit value has a value of 90%.

Step S5063 is adopted to judge whether the energy storage module 2 is full of enough electric quantity, and after the energy storage module 2 is full of enough electric quantity, the direct current output cabinet 1 is suspended, and power is independently supplied to the power utilization load 13 through the energy storage module 2; if the broken energy storage module 2 is not fully charged with enough electric quantity, the generator 11 is used for continuously charging the energy storage module 2.

S503, judging whether E is smaller than the first upper limit value, if yes, executing step S5031, otherwise, executing step S5032.

S5031, detecting the current DC bus voltage, adjusting the setting voltage of the DC output cabinet 1 to be higher than the DC bus voltage, and controlling the DC output cabinet 1 to output with rated output power.

S5032, adjusting the set voltage of the direct current output cabinet 1 to be consistent with the voltage of the direct current bus, and controlling the direct current output cabinet 1 to output in a variable power mode along with the electric load 13.

S504, judging whether E is larger than a first charge lower limit value, if so, executing step S5041, otherwise, executing step S5042.

S5041, detecting the current DC bus voltage, adjusting the setting voltage of the DC output cabinet 1 to be lower than the detected DC bus voltage, and controlling the DC output cabinet 1 to output at rated output power.

In specific implementation, after the controller 8 obtains the current dc bus voltage, determines a new setting voltage according to the dc bus voltage, where the value of the new setting voltage is smaller than the dc bus voltage, and then sends a setting voltage adjustment instruction and an output mode adjustment instruction to the dc output cabinet 1, where the voltage adjustment instruction carries the value of the new setting voltage, and the output mode adjustment instruction includes an output mode that is output with rated output power. The dc output cabinet 1 adjusts the set voltage according to the received instruction and adjusts the output mode to output at the rated output power. After the direct current output cabinet 1 is set according to the instruction of the controller 8, the output power of the direct current output cabinet 1 is P0, the voltage output by the direct current output cabinet 1 is lower than the voltage of the energy storage module 2, the energy storage module 2 starts discharging, and the direct current output cabinet 1 and the energy storage module 2 supply power to the power utilization load 13 together.

S5042, generating load reduction operation prompt information.

In one possible implementation, when p0.ltoreq.p0.ltoreq.p0+p1, if E is smaller than the second lower charging limit value, the high-voltage dc contactor 9 is controlled to be opened and the system is controlled to stop supplying power to the power utilization load 13, and after the system is determined to stop supplying power to the power utilization load 13, the high-voltage dc contactor 9 is controlled to be closed, so as to charge the energy storage module 2. The second lower charge limit value is smaller than the first lower charge limit value, and the second lower charge limit value can be any one of 5% -15%. In one possible embodiment, the second lower charge limit value has a value of 10%. The specific execution process refers to steps 3043 to S3045 in fig. 4, and will not be described again.

S505, the control system stops supplying power to the electric load 13.

When P > P0+P1, the load of the electric load 13 exceeds the maximum power which can be output by the system, and in order to ensure the safety of the system, the controller 8 can perform overload protection and shut down the system. The operation of overload protection may include: (1) The aim of stopping power supply to the electric load 13 is achieved by controlling at least one of the direct current output cabinet 1, the inverter 3, the filter 4, the isolation transformer 5 and the system output power distribution cabinet 6 to stop working; (2) The high-voltage direct-current contactor 9 is disconnected to cut off the connection between the energy storage module 2 and the bus, and the energy storage module 2 stops charging and discharging.

In specific implementation, after the controller 8 completes step S505, after determining that the system stops supplying power to the power load 13, the controller controls the high-voltage dc contactor 9 to close, so as to charge the energy storage module 2. Or after the controller 8 has executed step S505, an alarm for system overload and shutdown may be sent, and the system may be restarted after the operation and maintenance personnel remove the fault.

In the control method of the high-power hybrid power supply system based on direct current networking provided by the embodiment of the application, the generator 11 for providing energy is not directly connected with a rear-end load through the direct current output cabinet 1, the output power of the direct current output cabinet 1 and the charge and discharge of the energy storage module 2 are adjusted according to the load change of the electric load 13 in the control process, the control of the load power of the generator 11 is indirectly realized, the power of the generator 11 is maintained in the interval of 0.5P0-P0 during the running, namely, the generator 11 is maintained in the optimal oil consumption load area to the maximum extent, the oil consumption is reduced, and the power generation efficiency is improved. By utilizing the rapid charge and discharge capability of the energy storage module 2, surplus electric energy is stored when the load is small, and the stored electric energy is rapidly released when the load is large, so that the project does not need to configure the input capacity according to the peak power, thereby improving the power supply efficiency and the system load rate and reducing the use cost.

In one possible implementation, the controller 8 uploads the data collected by the data collection module 7 to the background server at intervals of 10 seconds or 30 seconds. The background server stores the data which are collected at the same time into a database as state data in the running process of the system after finishing the data, and the data collected at the same time can be generally finished into a group of data. Based on this, referring to fig. 6, the control method of the high-power hybrid power supply system based on the dc networking according to the embodiment of the present application further includes the following steps:

s601, acquiring state data in the running process of the system acquired at fixed time.

Wherein each set of status data comprises at least: the data acquisition time, the real-time voltage of the energy storage module 2, the load side electric quantity, the direct current input side electric quantity and the like.

In specific implementation, the real-time voltage and the direct current input side electric quantity of the energy storage module 2 can be collected through the first ammeter, and the load side electric quantity can be collected through the second ammeter.

The state data acquired in step S601 is data acquired after the last adjustment of the charge cutoff voltage and the discharge cutoff voltage.

S602, determining a plurality of deep charge periods and deep discharge periods according to the acquired state data.

One deep charging cycle refers to a process in which the state of charge of the energy storage module 2 is increased from not more than 40% to not less than 90%, and no discharge occurs in the energy storage module 2. A deep discharging period refers to a process that the state of charge of the energy storage module 2 is reduced from no less than 90% to no more than 40%, and the energy storage module 2 is not charged.

In specific implementation, determining the charge state E of the energy storage module 2 corresponding to each data acquisition time according to the real-time voltage in each group of state data and the current charge cut-off voltage and discharge cut-off voltage; according to the sequence of the data acquisition time, a sequence of the change of the state of charge E along with time is obtained, a continuously rising interval of the state of charge E is determined from the sequence, each interval corresponds to a charging process without discharging, and the intervals can be determined in a mode of finding an extremum; the starting time of each interval is a charging starting point, the ending time of each interval is a charging ending point, and the intervals meeting the following conditions are screened from the intervals: e at the starting moment is less than or equal to 40 percent, E at the ending moment is more than or equal to 90 percent, and the interval meeting the conditions is a deep charging period.

In specific implementation, determining the charge state E of the energy storage module 2 corresponding to each data acquisition time according to the real-time voltage in each group of state data and the current charge cut-off voltage and discharge cut-off voltage; according to the sequence of the data acquisition time, a sequence of the change of the state of charge E along with time is obtained, a continuously reduced interval of the state of charge E is determined from the sequence, each interval corresponds to a discharging process without charging, and the intervals can be determined in a mode of finding an extreme value; the starting time of each interval is the discharge starting point, the ending time of each interval is the discharge ending point, and the intervals meeting the following conditions are screened from the intervals: e at the starting moment is more than or equal to 90% and E at the ending moment is less than or equal to 40%, and the interval meeting the conditions is a deep discharge period.

S603, determining a charging performance index according to state data in a plurality of deep charging periods, and adjusting the charging cut-off voltage according to the charging performance index.

In specific implementation, at least one of the following charging performance indexes is adopted: a change trend of the specified charge increment, a change trend of the specified charge duration, and the number of charge abnormalities.

The specified charge increment refers to the charge increment of the energy storage module 2 after being charged for a first specified duration in a deep charging period. The charge increment is determined based on the difference between the load side charge and the dc input side charge. The first specified duration should be less than the shortest deep charge period, and a period in the middle of the deep charge period is generally selected as the first specified duration, for example, the period of 40% -80% of the state of charge is, specifically, determined according to historical data, for example, a minimum of 40 minutes is required for charging the state of charge from 40% -80%, and then the first specified duration should be less than 40 minutes, for example, 30 minutes is optional. Further, the timing starting time of the first designated duration may be a starting time of a deep charging period or a corresponding time when the state of charge reaches a certain value (e.g. 40%, 50%).

In specific implementation, for each deep charging period, a start time t1 of a first specified duration, a direct current input side electric quantity Q1, t1 and a load side electric quantity Q2, t1 are obtained, and an end time t2 of the first specified duration, a direct current input side electric quantity Q1, t2 and a load side electric quantity Q2, t2 are obtained, wherein after the first specified duration (t 2-t 1) is charged in the deep charging period, a charge increment Δq= (Q2, t2-Q2, t 1) - (Q1, t2-Q1, t 1) of the energy storage module 2 is obtained. And obtaining the change trend of the appointed charge increment along with time according to the corresponding data acquisition time and the appointed charge increment delta Q of each depth charging period. When the trend of Δq decreasing with time exceeds a preset threshold or Δq is smaller than a certain preset value, the charging cut-off voltage of the energy storage module 2 is reduced. The magnitude of the charge cutoff voltage and the tendency of Δq to decrease over time are positively correlated. In particular, the trend may be determined based on the slope of the specified charge increment over time.

The specified charging duration refers to a duration required when the state of charge of the energy storage module 2 increases from the first specified value to the second specified value in one deep charging period. The first specified value is not less than 40%, the second specified value is not more than 80%, and the first specified value is less than the second specified value, and the specific value can be selected according to practical application conditions within the range.

In specific implementation, for each deep charging period, a data acquisition time T1 with a state of charge of the energy storage module 2 being a first specified value and a data acquisition time T2 with a state of charge being a second specified value in the deep charging period are obtained, and a charging duration Δt=t2-T1 is specified. And obtaining the change trend of the delta T along with time according to the designated charging duration delta T corresponding to each deep charging period. When the trend of the delta T becoming longer exceeds a preset threshold or the delta T is larger than a certain preset value, the charging cut-off voltage of the energy storage module 2 is reduced.

The abnormal charge refers to that the duration of the state of charge which is not increased in one deep charge period exceeds a preset duration. The preset duration is a value determined empirically and based on historical data, for example 5 minutes. During charging, a long period of non-increase in state of charge indicates that the energy storage battery may have problems, such as no charge after 80% charge.

In the implementation, for each deep charging period, a time-varying sequence of the state of charge in the deep period can be obtained, the situation that the state of charge is not increased and the duration exceeds the preset duration is found from the sequence, and the statistical value of the abnormal charging is increased once when the situation occurs once. And counting the charging anomalies for all the deep charging periods to obtain the total number of charging anomalies. When the number of abnormal charging times exceeds a certain preset value, the charging cut-off voltage of the energy storage module 2 is reduced.

In specific implementation, the two or three indexes can be combined to determine and adjust the charge cut-off voltage of the energy storage module 2. For example, when all the three indexes meet the requirements, the charging cut-off voltage is adjusted; and when any two of the three indexes meet the requirement, adjusting the charging cut-off voltage.

S604, determining a discharge performance index according to state data in a plurality of deep discharge periods, and adjusting discharge cut-off voltage according to the discharge performance index.

In specific implementation, the discharge performance index includes at least one of the following indexes: a change trend of the specified charge decrement and a change trend of the specified discharge time period.

The specified charge decrement refers to a charge value increment of the energy storage module 2 after discharging for a second specified duration in a deep discharging period, and the charge increment is determined according to a difference value between the load side electric quantity and the direct current input side electric quantity. The calculation mode of the designated charge decrement is similar to that of the designated charge increment, the selection mode of the second designated time period is similar to that of the first designated time period, and the repeated description is omitted. And obtaining the change trend of the specified charge decrement along with time according to the corresponding data acquisition time and the specified charge decrement of each deep discharge period. When the trend of decreasing the specified charge decrement with time exceeds a preset threshold or the specified charge decrement is smaller than a certain preset value, the discharge cut-off voltage of the energy storage module 2 is lowered. The magnitude of the discharge cutoff voltage and the tendency of the specified charge reduction over time are positively correlated. Specifically, the trend may be judged based on the slope of the specified charge loss over time.

The specified discharge duration refers to a duration required when the state of charge of the energy storage module 2 drops from the second specified value to the first specified value in one deep discharge period. The determination mode of the appointed discharging time is similar to the determination mode of the appointed charging time, and is not repeated. And obtaining the change trend of the specified discharge time length along with time according to the specified discharge time length corresponding to each deep discharge period. And when the trend of the longer appointed discharge time length exceeds a preset threshold value or the appointed discharge time length is larger than a certain preset value, reducing the discharge cut-off voltage of the energy storage module 2.

In one possible embodiment, the discharge cutoff voltage is adjusted when both the specified charge decrement and the specified discharge duration meet the requirements; or when one of the specified charge decrement or the specified discharge duration satisfies the requirement, the discharge cutoff voltage is adjusted.

In the implementation, the step shown in fig. 6 may be executed periodically by the background server, for example, when the accumulated deep charge period and deep discharge period reach a certain number, these data are analyzed, or these data are analyzed at certain intervals (such as one month), so as to determine the state difference of the energy storage module 2, if the difference is obvious, a suggestion for adjusting the charge and discharge cut-off voltage is given, and the operation and maintenance personnel can accept the suggestion according to the actual selection. By recording the data such as voltage, current, electric quantity and the like during each deep charge and discharge, a data analysis model is established, so that the performance of the energy storage module 2 is analyzed, a suggestion for optimizing the internal direct current voltage range is provided for the system, and the stability and the safety of the energy storage module 2 and the system are improved.

According to the high-power hybrid power supply system based on the direct current networking and the control method thereof, the direct current networking mode is adopted in the system, the energy storage module 2 with the multi-rate discharging capability responds preferentially at the moment of external load change, so that the system can respond to the external peak load demand rapidly in a very short time, and meanwhile, the output power of the direct current output cabinet 1 is always on line, so that the peak load capacity of the whole power supply system is equal to the sum of the rated output power of the direct current output cabinet 1 and the peak output power of the energy storage module 2, and the output peak power is large; when the external load is smaller, the energy storage module 2 or the input power supply can be carried independently according to the situation, or the energy storage module 2 can be charged while being carried by the input power supply, so that the energy surplus is avoided. Therefore, the high-power hybrid power supply system based on the direct current networking and the control method thereof are particularly suitable for scenes of large load, random load starting and large phase difference between average power and peak power in large-scale engineering construction projects, and can meet the field power consumption requirement under the condition of no capacity expansion. For example, during the construction period of pile drivers of engineering construction, the device can meet the power requirement of simultaneous construction of a plurality of hydraulic pile drivers, improve the scene adaptability of the hydraulic pile drivers, promote the transformation of pile foundation construction industry to greener environment-friendly construction, save cost and contribute to environmental protection.

The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, component disassembly, or combination thereof, etc. that falls within the spirit and principles of the present invention should be included in the scope of the present invention.

Claims

1. High-power hybrid power supply system based on direct current network deployment, characterized by comprising: the system comprises a direct current output cabinet, an inverter, a filter, an isolation transformer, a system output power distribution cabinet, an energy storage module, a data acquisition module and a controller;

2. The high-power hybrid power supply system based on direct current networking of claim 1, wherein: the data acquisition module comprises a first ammeter arranged at the output end of the direct-current output cabinet and a second ammeter arranged at the output end of the system output power distribution cabinet.

3. The high-power hybrid power supply system based on direct current networking of claim 2, wherein: the energy storage module takes a carbon-based capacitor as an energy storage material.

4. The dc networking-based high power hybrid power supply system according to claim 3, wherein: the input end of the direct current output cabinet is provided with two incoming line breakers, the two incoming line breakers are mechanically interlocked, and the two incoming line breakers are respectively used for connecting a generator and a power grid power supply transformer.

5. A control method of a dc networking-based high power hybrid power supply system according to any one of claims 1 to 4, comprising the steps of:

detecting the charge state E of the energy storage module;

6. The control method of a high-power hybrid power supply system based on direct current networking according to claim 5, wherein when p0.ltoreq.p0+p1 is not more than p0, the method further comprises:

7. The method for controlling a high-power hybrid power supply system based on direct current networking according to claim 6, wherein, when the input power source is a generator, before the step corresponding to the condition "P < P0" is performed, the method further comprises: p is determined to be less than or equal to 0.5P0;

if E is smaller than the first charge lower limit value, detecting the current DC bus voltage, adjusting the setting voltage of the DC output cabinet to be higher than the DC bus voltage, controlling the DC output cabinet to output with rated output power so as to supply power to an electric load and charge an energy storage module, and controlling the DC output cabinet to stop outputting until E is larger than the first charge upper limit value, and independently supplying power to the electric load through the energy storage module.

8. The control method of the high-power hybrid power supply system based on the direct current network according to claim 7, wherein the control method comprises the following steps: and in the process of charging the energy storage module, when E is not greater than a charging mode threshold, controlling the direct current output cabinet to output at a rated output power constant current, and when E is greater than the charging mode threshold, controlling the direct current output cabinet to output at a rated output power constant voltage.

9. The method for controlling a high-power hybrid power supply system based on direct current networking according to claim 8, further comprising:

10. The method for controlling a high-power hybrid power supply system based on direct current networking according to claim 9, wherein the charging performance index comprises at least one of the following: designating a charge increment, designating a charge duration and a charge anomaly number; the specified charge increment is the charge increment of the energy storage module after being charged for a first specified duration in a deep charging period, the charge increment is determined according to the difference value between the electric quantity of the load side and the electric quantity of the direct current input side, the specified charge duration is the duration required when the state of charge of the energy storage module is increased from the first specified value to a second specified value in the deep charging period, and the abnormal charge is the duration that the state of charge is not increased in the deep charging period exceeds a preset duration;