Non-power-cut operation method and device suitable for distributed photovoltaic circuit

Abstract

The invention relates to an uninterruptible power operation method and device suitable for a distributed photovoltaic circuit, and the method comprises the steps: connecting a mobile energy storage device in parallel at the AC side of a diesel generating set; acquiring voltage and current of a load side, and calculating load power according to the voltage and the current; the current working condition is determined according to the magnitude of the load power, and the diesel generating set and the mobile energy storage device are controlled according to the current working condition to achieve non-power-cut operation. The practical engineering problem that a diesel generator car unit cannot receive reverse power in the non-power-cut operation on-load process is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of electric power systems, and in particular to a non-stop operation method and device suitable for distributed photovoltaic lines. Background Art

[0002] In recent years, distributed power generation and grid-connected operation represented by photovoltaics (PV) have received widespread attention. With the large-scale access of distributed photovoltaics, the flow of distribution networks has developed from one-way flow to two-way flow, which has added uncertainties to the safe and stable operation of the power grid, and at the same time has brought new challenges to the daily production, maintenance, operation and maintenance of the distribution network.

[0003] In rural areas, due to the large number of distributed photovoltaics connected to the distribution network, during the period of large distributed photovoltaic power generation, photovoltaic power will be reversed. Traditional non-stop power supply operations realize line load transfer through the primary and secondary grid connection of diesel generators. Maintenance personnel can replace transformers, distribution boxes, transformer gear adjustment and other daily maintenance and operation and maintenance work at the top of the line switch. However, for lines or substations containing distributed photovoltaics, since the diesel generator unit cannot accept reverse power, it is impossible to perform non-stop power supply operations on the line. Summary of the invention

[0004] The present invention provides a non-stop operation method and device applicable to distributed photovoltaic lines, which solve the problem of non-stop operation of distributed photovoltaic lines.

[0005] The technical solution adopted by the present invention to solve the technical problem is: to provide a non-stop operation method applicable to distributed photovoltaic lines, comprising the following steps:

[0006] Connect a mobile energy storage device in parallel to the AC side of the diesel generator set;

[0007] Obtaining the voltage and current on the load side, and calculating the load power according to the voltage and current;

[0008] The current working condition is determined according to the load power, and the diesel generator set and the mobile energy storage device are controlled according to the current working condition to achieve non-stop operation.

[0009] Determining the current working condition according to the load power, and controlling the diesel generator set and the mobile energy storage device according to the current working condition to achieve non-stop operation, specifically includes:

[0010] Determining whether the load power is a positive value;

[0011] If the load power is a negative value, the current working condition is the first working condition, and the diesel generator set and the mobile energy storage device are controlled under the first working condition to achieve non-stop operation;

[0012] Under the first operating condition, the mobile energy storage device adopts the voltage source operation mode, and the first switch of the diesel generator set is closed; the mobile energy storage device absorbs photovoltaic reverse power.

[0013] In the first working condition, it also includes:

[0014] It is determined whether the state of charge of the mobile energy storage device exceeds a first preset value. If the state of charge of the mobile energy storage device exceeds the first preset value, the mobile energy storage device is controlled to stop absorbing photovoltaic reverse power.

[0015] The non-stop operation method applicable to distributed photovoltaic lines also includes:

[0016] If the load power is a positive value, determining whether the load power is less than the rated power of the mobile energy storage device;

[0017] If the load power is less than the rated power of the mobile energy storage device, the current operating condition is the second operating condition, and the diesel generator set and the mobile energy storage device are controlled under the second operating condition to achieve non-stop operation;

[0018] Under the second operating condition, the mobile energy storage device adopts the voltage source operation mode, the first switch of the diesel generator set is closed, the mobile energy storage device operates with load, and the third switch of the diesel generator set is disconnected; the diesel generator set is in hot standby state.

[0019] In the second working condition, it also includes:

[0020] Determine whether the state of charge of the mobile energy storage device is lower than a second preset value. If the state of charge of the mobile energy storage device is lower than the second preset value, start the diesel generator set and make the output of the diesel generator set the sum of the load power and the charging power of the mobile energy storage device.

[0021] The non-stop operation method applicable to distributed photovoltaic lines also includes:

[0022] If the load power is greater than the rated power of the mobile energy storage device, determining whether the load power is less than the rated power of the diesel generator set;

[0023] If the load power is less than the rated power of the diesel generator set, the current working condition is the third working condition, and the diesel generator set and the mobile energy storage device are controlled under the third working condition to achieve non-stop operation;

[0024] Under the third operating condition, the diesel generator set adopts the voltage source operation mode, the first switch of the diesel generator set is closed, the diesel generator set operates with load at the highest operating efficiency point, and the third switch of the diesel generator set is disconnected; when the operating power of the diesel generator set is greater than the load power, the mobile energy storage device is in a charging state; when the operating power of the diesel generator set is less than the load power, the mobile energy storage device is in a discharging state.

[0025] Under the third working condition, it also includes:

[0026] Determine whether the state of charge of the mobile energy storage device is lower than a second preset value. If the state of charge of the mobile energy storage device is lower than the second preset value, control the mobile energy storage device to switch to a charging state, and the charging power of the mobile energy storage device does not exceed the difference between the rated power of the diesel generator set and the load power;

[0027] It is determined whether the state of charge of the mobile energy storage device exceeds a third preset value. If the state of charge of the mobile energy storage device exceeds the third preset value, the mobile energy storage device is controlled to switch to a standby state.

[0028] The non-stop operation method applicable to distributed photovoltaic lines also includes:

[0029] If the load power is greater than the rated power of the diesel generator set, the current operating condition is the fourth operating condition, and the diesel generator set and the mobile energy storage device are controlled under the fourth operating condition to achieve non-stop operation;

[0030] Under the fourth operating condition, the diesel generator set and the mobile energy storage device adopt a constant power operation mode, and the first switch of the diesel generator set is closed. When the diesel generator set and the mobile energy storage device jointly output power to the third switch of the diesel generator set and the current is close to zero, the third switch of the diesel generator set is disconnected, and the diesel generator set is switched to a voltage source mode, and the mobile energy storage device is a power source.

[0031] Under the fourth working condition, it also includes:

[0032] Determine whether the state of charge of the mobile energy storage device is lower than a fourth preset value. If the state of charge of the mobile energy storage device is lower than the fourth preset value, control the mobile energy storage device to stop running or deploy other mobile energy storage devices in parallel to the AC side of the diesel generator set.

[0033] The technical solution adopted by the present invention to solve the technical problem is: to provide a non-stop operation device suitable for distributed photovoltaic lines, comprising:

[0034] A connection module for connecting a mobile energy storage device in parallel to the AC side of a diesel generator set;

[0035] An acquisition calculation module is used to obtain the voltage and current on the load side and calculate the load power according to the voltage and current;

[0036] The control module is used to determine the current working condition according to the load power, and control the diesel generator set and the mobile energy storage device according to the current working condition to achieve non-stop operation.

[0037] The control module comprises:

[0038] A first judging unit, used to judge whether the load power is a positive value;

[0039] A first execution unit is used to control the diesel generator set and the mobile energy storage device to achieve non-stop operation under a first working condition when the load power is a positive value;

[0040] Under the first operating condition, the first execution unit controls the mobile energy storage device to adopt a voltage source operation mode and closes the first switch of the diesel generator set; the mobile energy storage device absorbs photovoltaic reverse power.

[0041] The first execution unit comprises:

[0042] A first state of charge determination subunit, used to determine whether the state of charge of the mobile energy storage device exceeds a first preset value;

[0043] The first control subunit is used to control the mobile energy storage device to stop absorbing photovoltaic reverse power when the charge state of the mobile energy storage device exceeds a first preset value.

[0044] The control module also includes:

[0045] A second judgment unit, used for judging whether the load power is less than the rated power of the mobile energy storage device when the load power is a positive value;

[0046] A second execution unit is used to control the diesel generator set and the mobile energy storage device to achieve non-stop operation under a second working condition when the load power is less than the rated power of the mobile energy storage device;

[0047] Under the second operating condition, the second execution unit controls the mobile energy storage device to adopt the voltage source operation mode, closes the first switch of the diesel generator set, the mobile energy storage device operates with load, and disconnects the third switch of the diesel generator set; the diesel generator set is in hot standby state.

[0048] The second execution unit further includes:

[0049] A second state of charge determination subunit, used to determine whether the state of charge of the mobile energy storage device is lower than a second preset value;

[0050] The second control subunit is used to start the diesel generator set when the charge state of the mobile energy storage device is lower than a second preset value, and make the output of the diesel generator set the sum of the load power and the charging power of the mobile energy storage device.

[0051] The control module also includes:

[0052] A third judgment unit, used for judging whether the load power is less than the rated power of the diesel generator set when the load power is greater than the rated power of the mobile energy storage device;

[0053] A third execution unit is used to control the diesel generator set and the mobile energy storage device to achieve non-stop operation under a third working condition when the load power is less than the rated power of the diesel generator set;

[0054] Under the third operating condition, the third execution unit controls the diesel generator set to adopt the voltage source operation mode, closes the first switch of the diesel generator set, and the diesel generator set operates with load at the highest operating efficiency point, and disconnects the third switch of the diesel generator set; when the operating power of the diesel generator set is greater than the load power, the mobile energy storage device is controlled to be in a charging state; when the operating power of the diesel generator set is less than the load power, the mobile energy storage device is controlled to be in a discharging state.

[0055] The third execution unit further includes:

[0056] A third state of charge determination subunit, used to determine whether the state of charge of the mobile energy storage device is lower than a second preset value;

[0057] A third control subunit is used to control the mobile energy storage device to switch to a charging state when the state of charge of the mobile energy storage device is lower than a second preset value, and the charging power of the mobile energy storage device does not exceed the difference between the rated power of the diesel generator set and the load power;

[0058] a fourth state of charge determination subunit, configured to determine whether the state of charge of the mobile energy storage device exceeds a third preset value;

[0059] The fourth control subunit is used to control the mobile energy storage device to switch to a standby state when the charge state of the mobile energy storage device exceeds a third preset value.

[0060] The control module also includes:

[0061] A fourth execution unit is used to control the diesel generator set and the mobile energy storage device to achieve non-stop operation in a fourth working condition when the load power is greater than the rated power of the diesel generator set;

[0062] Under the fourth operating condition, the fourth execution unit controls the diesel generator set and the mobile energy storage device to adopt a constant power operation mode, closes the first switch of the diesel generator set, and when the diesel generator set and the mobile energy storage device jointly output power to the third switch current of the diesel generator set close to zero, the third switch of the diesel generator set is disconnected, the diesel generator set is switched to a voltage source mode, and the mobile energy storage device is a power source.

[0063] The fourth execution unit further includes:

[0064] a fifth state of charge determination subunit, configured to determine whether the state of charge of the mobile energy storage device is lower than a fourth preset value;

[0065] The fifth control subunit is used to control the mobile energy storage device to stop running or deploy other mobile energy storage devices in parallel to the AC side of the diesel generator set when the charge state of the mobile energy storage device is lower than a fourth preset value.

[0066] The technical solution adopted by the present invention to solve its technical problem is: to provide an electronic device, including a memory, a processor and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the steps of the above-mentioned method for non-stop operation applicable to distributed photovoltaic lines are implemented.

[0067] The technical solution adopted by the present invention to solve its technical problem is: providing a computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned non-stop operation method applicable to distributed photovoltaic lines are implemented.

[0068] Beneficial Effects

[0069] Due to the adoption of the above-mentioned technical scheme, the present invention has the following advantages and positive effects compared with the prior art: the present invention adopts the mode of parallel operation of mobile energy storage device and diesel generator set, and executes the diesel-storage joint operation control strategy under the condition of fully considering the boundary conditions such as the charge state of the mobile energy storage device and the optimal working efficiency of the diesel generator set (try to operate at the highest operating efficiency point) during non-stop operation, thereby solving the actual engineering problem that the diesel generator set cannot accept reverse power during non-stop operation and loading, and at the same time improves the operating efficiency of the diesel generator set during non-stop operation and the safe and stable operation of the mobile energy storage vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] Figure 1 It is a flow chart of a first embodiment of the present invention applicable to a non-stop operation method including distributed photovoltaic lines;

[0071] Figure 2 This is a schematic diagram of a diesel generator set and a mobile energy storage vehicle connected in parallel in the first embodiment of the present invention;

[0072] Figure 3 This is a flow chart of the control strategy for diesel-storage combined operation without power outages in the first embodiment of the present invention. DETAILED DESCRIPTION

[0073] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0074] The first embodiment of the present invention relates to a non-stop operation method applicable to distributed photovoltaic lines, which uses a mobile energy storage device and a diesel generator set to operate in parallel to solve the practical engineering problem that traditional non-stop operation methods cannot accept reverse power. Figure 1 As shown, the following steps are included:

[0075] Step 1: Connect a mobile energy storage device in parallel to the AC side of the diesel generator set. In this step, the mobile energy storage device uses a 500kW / 500kWh mobile energy storage vehicle, and the diesel generator set uses a 1MW diesel generator vehicle. Figure 2 As shown, in terms of access mode, the AC output side of the mobile energy storage vehicle is connected to the parallel interface of the diesel generator vehicle, so that the mobile energy storage vehicle and the diesel generator set are connected in parallel on the AC side. The lower end quick interface of the #2 switch of the diesel generator vehicle is connected to the load side (i.e., the lower end of the online switch), and the lower end quick interface of the #3 switch is connected to the power supply side of the grid (i.e., the upper end of the online switch). The online switch is disconnected, and the load is still powered by the grid. In terms of secondary communication, the main control of the mobile energy storage vehicle is connected to the controller of the diesel generator vehicle through 485 to receive control instructions from the diesel generator vehicle.

[0076] Step 2: Obtain the voltage and current on the load side, and calculate the load power based on the voltage and current.

[0077] Step 3, determine the current working condition according to the load power, and control the diesel generator and mobile energy storage vehicle according to the current working condition to achieve non-stop operation. Figure 3 The control strategy for the combined operation of diesel and energy storage without power outage is shown.

[0078] This step is divided into four working conditions according to the size of the load power, namely: (1) When the power is a negative value, it indicates that the current distributed photovoltaic power generation period is in progress and the power flows in the reverse direction. This situation is working condition 1; (2) When the power is a positive value and the power is less than the rated power of the mobile energy storage vehicle (less than 500kW), this situation is working condition 2; (3) When the power is a positive value and the power is greater than the rated power of the mobile energy storage vehicle but less than the rated power of the diesel generator vehicle (between 500kW and 1MW), this situation is working condition 3; (4) When the power is a positive value and the power is greater than the rated power of the diesel generator vehicle but less than the sum of the powers of the two vehicles (between 1MW and 1.5MW), this situation is working condition 4. Based on the above four working conditions, this step is specifically as follows:

[0079] First, determine whether the load power is a positive value. If the load power is a negative value, it indicates that the current period is a distributed photovoltaic power generation period, and the power flows in the reverse direction, that is, the current working condition is working condition 1. At this time, the diesel generator truck and the mobile energy storage truck are controlled under working condition 1 to achieve non-stop operation.

[0080] In the case of working condition 1, the mobile energy storage vehicle is started and the voltage source operation mode is adopted. After the same period is completed, the #1 switch of the diesel generator vehicle is closed. At this time, the reverse power of the distributed photovoltaic is absorbed and stored by the mobile energy storage vehicle. The diesel generator vehicle can be kept idle in this working condition (it is recommended that the non-stop operation time be between 10 am and 3 pm, and the initial SOC of the mobile energy storage vehicle be around 50% to ensure that there is space and capacity for charging when operating under working condition 1).

[0081] In working condition 1, it can also be determined whether the state of charge of the mobile energy storage vehicle is greater than 95%. When the state of charge of the mobile energy storage vehicle is greater than 95%, the mobile energy storage vehicle is controlled to stop absorbing photovoltaic reverse power.

[0082] During working condition 1, the real-time voltage and real-time current on the load side are also detected in real time, and the load power is calculated based on the real-time voltage and real-time current on the load side. If the load power changes from a negative value to a positive value, it will switch to the working condition 2 operation mode.

[0083] If the load power is a positive value, it is further determined whether the load power is less than the rated power of the mobile energy storage vehicle. If the load power is less than the rated power of the mobile energy storage vehicle, the current operating condition is operating condition 2, and the diesel generator vehicle and the mobile energy storage vehicle are controlled under operating condition 2 to achieve non-stop operation.

[0084] Under working condition 2, the mobile energy storage vehicle is started and the voltage source operation mode is adopted. After the synchronization is completed, the #1 switch of the diesel generator vehicle is closed. At this time, the mobile energy storage vehicle runs with the load, and the #3 switch of the diesel generator vehicle is disconnected. Under this working condition, the diesel generator vehicle is in hot standby state.

[0085] In working condition 2, it can also be determined whether the state of charge of the mobile energy storage vehicle is less than 20%. If the state of charge of the mobile energy storage vehicle is less than 20%, the diesel generator vehicle is started (as a power source), and the output of the diesel generator vehicle is made the sum of the load power and the charging power of the mobile energy storage vehicle, wherein the charging power of the mobile energy storage vehicle can be set by itself.

[0086] During operating condition 2, the real-time voltage and real-time current on the load side are also detected in real time, and the load power is calculated based on the real-time voltage and real-time current on the load side. If the load power changes from a positive value to a negative value, it switches to the operating mode of operating condition 1; if the load power increases to exceed the rated power of the mobile energy storage vehicle but is less than the power of the diesel generator vehicle, it switches to the operating mode of operating condition 3.

[0087] If the load power is greater than the rated power of the mobile energy storage vehicle, it is further determined whether the load power is less than the rated power of the diesel generator vehicle. If the load power is less than the rated power of the diesel generator vehicle, the current operating condition is operating condition 3, and the diesel generator vehicle and the mobile energy storage vehicle are controlled under operating condition 3 to achieve non-stop operation.

[0088] In the case of working condition 3, the diesel generator car is started and the voltage source operation mode is adopted. After the synchronization is completed, the #1 switch of the diesel generator car is closed. At this time, the diesel generator car is operated with load, and the #3 switch of the diesel generator car is disconnected. Under this working condition, the diesel generator car can operate at 80% of the rated power (the highest operating efficiency point), and the excess or insufficient power can be supplemented by charging or discharging the mobile energy storage car, that is, when the operating power of the diesel generator car is greater than the load power, the mobile energy storage car is in a charging state; when the operating power of the diesel generator car is less than the load power, the mobile energy storage car is in a discharging state.

[0089] Under working condition 3, it can also be determined whether the state of charge of the mobile energy storage vehicle is less than 20%. If the state of charge of the mobile energy storage vehicle is less than 20%, the mobile energy storage vehicle switches to the charging state, and the charging power does not exceed the difference between the rated power of the diesel generator vehicle and the load power; if the state of charge of the mobile energy storage vehicle exceeds 20%, it is further determined whether the state of charge of the mobile energy storage vehicle is greater than 80%. If the state of charge of the mobile energy storage vehicle is greater than 80%, the mobile energy storage vehicle switches to the standby mode, and all loads are supplied by the diesel generator vehicle.

[0090] During operating condition 3, the real-time voltage and real-time current on the load side are also detected in real time, and the load power is calculated based on the real-time voltage and real-time current on the load side. If the load power increases to exceed the rated power of the diesel generator truck, it switches to the operating mode of operating condition 4; if the load power decreases to be lower than the rated power of the mobile energy storage vehicle, it switches to the operating mode of operating condition 2.

[0091] If the load power is greater than the rated power of the diesel generator truck, it is further determined whether the load power is less than the sum of the rated power of the diesel generator truck and the rated power of the mobile energy storage truck. If the load power is less than the sum of the rated power of the diesel generator truck and the rated power of the mobile energy storage truck, the current operating condition is operating condition 4, and the diesel generator truck and the mobile energy storage truck are controlled under operating condition 4 to achieve non-stop operation.

[0092] Under working condition 4, the diesel generator and the mobile energy storage vehicle are started and the constant power operation mode is adopted. After the synchronization is completed, the #1 switch of the diesel generator is closed. At this time, the diesel generator and the mobile energy storage vehicle jointly output until the current of the #3 switch of the diesel generator is close to 0, then the #3 switch of the diesel generator is disconnected, and the diesel generator is switched to the voltage source mode, and the mobile energy storage vehicle is the power source.

[0093] In working condition 4, it can also be determined whether the state of charge of the mobile energy storage vehicle is less than 10%. When the state of charge of the mobile energy storage vehicle is less than 10%, another power supply vehicle should be deployed immediately or the operation should be stopped.

[0094] During working condition 4, the real-time voltage and real-time current on the load side are also detected in real time, and the load power is calculated based on the real-time voltage and real-time current on the load side. If the load power drops below the rated power of the diesel generator vehicle, it switches to working condition 3 operation mode.

[0095] It is not difficult to find that the control strategy of the diesel-storage joint operation of this implementation method fully considers the boundary conditions such as the charge state of the mobile energy storage vehicle and the optimal working efficiency of the diesel generator vehicle during non-stop operation, and solves the practical engineering problem that the traditional diesel generator vehicle unit cannot accept reverse power during non-stop operation. At the same time, it improves the operating efficiency of the diesel generator vehicle during non-stop operation and the safe and stable operation of the mobile energy storage vehicle.

[0096] The second embodiment of the present invention relates to a non-stop operation device suitable for distributed photovoltaic lines, comprising:

[0097] A connection module for connecting a mobile energy storage device in parallel to the AC side of a diesel generator set;

[0098] An acquisition calculation module is used to obtain the voltage and current on the load side and calculate the load power according to the voltage and current;

[0099] The control module is used to determine the current working condition according to the load power, and control the diesel generator set and the mobile energy storage device according to the current working condition to achieve non-stop operation.

[0100] The control module comprises:

[0101] A first judging unit, used to judge whether the load power is a positive value;

[0102] A first execution unit is used to control the diesel generator set and the mobile energy storage device to achieve non-stop operation under a first working condition when the load power is a positive value;

[0103] Under the first operating condition, the first execution unit controls the mobile energy storage device to adopt a voltage source operation mode and closes the first switch of the diesel generator set; the mobile energy storage device absorbs photovoltaic reverse power.

[0104] The first execution unit comprises:

[0105] A first state of charge determination subunit, used to determine whether the state of charge of the mobile energy storage device exceeds a first preset value;

[0106] The first control subunit is used to control the mobile energy storage device to stop absorbing photovoltaic reverse power when the charge state of the mobile energy storage device exceeds a first preset value.

[0107] The control module also includes:

[0108] A second judgment unit, used for judging whether the load power is less than the rated power of the mobile energy storage device when the load power is a positive value;

[0109] A second execution unit is used to control the diesel generator set and the mobile energy storage device to achieve non-stop operation under a second working condition when the load power is less than the rated power of the mobile energy storage device;

[0110] Under the second operating condition, the second execution unit controls the mobile energy storage device to adopt the voltage source operation mode, closes the first switch of the diesel generator set, the mobile energy storage device operates with load, and disconnects the third switch of the diesel generator set; the diesel generator set is in hot standby state.

[0111] The second execution unit further includes:

[0112] A second state of charge determination subunit, used to determine whether the state of charge of the mobile energy storage device is lower than a second preset value;

[0113] The second control subunit is used to start the diesel generator set when the charge state of the mobile energy storage device is lower than a second preset value, and make the output of the diesel generator set the sum of the load power and the charging power of the mobile energy storage device.

[0114] The control module also includes:

[0115] A third judgment unit, used for judging whether the load power is less than the rated power of the diesel generator set when the load power is greater than the rated power of the mobile energy storage device;

[0116] A third execution unit is used to control the diesel generator set and the mobile energy storage device to achieve non-stop operation under a third working condition when the load power is less than the rated power of the diesel generator set;

[0117] Under the third operating condition, the third execution unit controls the diesel generator set to adopt the voltage source operation mode, closes the first switch of the diesel generator set, and the diesel generator set operates with load at the highest operating efficiency point, and disconnects the third switch of the diesel generator set; when the operating power of the diesel generator set is greater than the load power, the mobile energy storage device is controlled to be in a charging state; when the operating power of the diesel generator set is less than the load power, the mobile energy storage device is controlled to be in a discharging state.

[0118] The third execution unit further includes:

[0119] A third state of charge determination subunit, used to determine whether the state of charge of the mobile energy storage device is lower than a second preset value;

[0120] A third control subunit is used to control the mobile energy storage device to switch to a charging state when the state of charge of the mobile energy storage device is lower than a second preset value, and the charging power of the mobile energy storage device does not exceed the difference between the rated power of the diesel generator set and the load power;

[0121] a fourth state of charge determination subunit, configured to determine whether the state of charge of the mobile energy storage device exceeds a third preset value;

[0122] The fourth control subunit is used to control the mobile energy storage device to switch to a standby state when the charge state of the mobile energy storage device exceeds a third preset value.

[0123] The control module also includes:

[0124] A fourth execution unit is used to control the diesel generator set and the mobile energy storage device to achieve non-stop operation in a fourth working condition when the load power is greater than the rated power of the diesel generator set;

[0125] Under the fourth operating condition, the fourth execution unit controls the diesel generator set and the mobile energy storage device to adopt a constant power operation mode, closes the first switch of the diesel generator set, and when the diesel generator set and the mobile energy storage device jointly output power to the third switch current of the diesel generator set close to zero, the third switch of the diesel generator set is disconnected, the diesel generator set is switched to a voltage source mode, and the mobile energy storage device is a power source.

[0126] The fourth execution unit further includes:

[0127] a fifth state of charge determination subunit, configured to determine whether the state of charge of the mobile energy storage device is lower than a fourth preset value;

[0128] The fifth control subunit is used to control the mobile energy storage device to stop running or deploy other mobile energy storage devices in parallel to the AC side of the diesel generator set when the charge state of the mobile energy storage device is lower than a fourth preset value.

[0129] The third embodiment of the present invention relates to an electronic device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the first embodiment of the method for non-stop operation applicable to distributed photovoltaic lines when executing the computer program.

[0130] The fourth embodiment of the present invention relates to a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the first embodiment of the method for non-stop operation of distributed photovoltaic lines.

[0131] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) that contain computer-usable program code.

[0132] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0133] These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction method, which is implemented in the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0134] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0135] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A non-stop operation method applicable to distributed photovoltaic lines, characterized in that: The following steps are involved: Connect a mobile energy storage device in parallel to the AC side of the diesel generator set; Obtaining the voltage and current on the load side, and calculating the load power according to the voltage and current; The current working condition is determined according to the load power, and the diesel generator set and the mobile energy storage device are controlled according to the current working condition to achieve non-stop operation.

2. The non-stop operation method applicable to distributed photovoltaic lines according to claim 1 is characterized in that: Determining the current working condition according to the load power, and controlling the diesel generator set and the mobile energy storage device according to the current working condition to achieve non-stop operation, specifically includes: Determining whether the load power is a positive value; If the load power is a negative value, the current working condition is the first working condition, and the diesel generator set and the mobile energy storage device are controlled under the first working condition to achieve non-stop operation; Under the first operating condition, the mobile energy storage device adopts the voltage source operation mode, and the first switch of the diesel generator set is closed; the mobile energy storage device absorbs the photovoltaic reverse power.

3. The non-stop operation method applicable to distributed photovoltaic lines according to claim 2 is characterized in that: In the first working condition, it also includes: It is determined whether the state of charge of the mobile energy storage device exceeds a first preset value. If the state of charge of the mobile energy storage device exceeds the first preset value, the mobile energy storage device is controlled to stop absorbing photovoltaic reverse power.

4. The non-stop operation method applicable to distributed photovoltaic lines according to claim 2 is characterized in that: Also includes: If the load power is a positive value, determine whether the load power is less than the rated power of the mobile energy storage device; if the load power is less than the rated power of the mobile energy storage device, the current operating condition is the second operating condition, and the diesel generator set and the mobile energy storage device are controlled under the second operating condition to achieve non-stop operation; Under the second operating condition, the mobile energy storage device adopts the voltage source operation mode, the first switch of the diesel generator set is closed, the mobile energy storage device operates with load, and the third switch of the diesel generator set is disconnected; the diesel generator set is in hot standby state.

5. The non-stop operation method applicable to distributed photovoltaic lines according to claim 4 is characterized in that: In the second working condition, it also includes: Determine whether the state of charge of the mobile energy storage device is lower than a second preset value. If the state of charge of the mobile energy storage device is lower than the second preset value, start the diesel generator set and make the output of the diesel generator set the sum of the load power and the charging power of the mobile energy storage device.

6. The non-stop operation method applicable to distributed photovoltaic lines according to claim 4 is characterized in that: Also includes: If the load power is greater than the rated power of the mobile energy storage device, determining whether the load power is less than the rated power of the diesel generator set; If the load power is less than the rated power of the diesel generator set, the current working condition is the third working condition, and the diesel generator set and the mobile energy storage device are controlled under the third working condition to achieve non-stop operation; Under the third working condition, the diesel generator set adopts the voltage source operation mode, the first switch of the diesel generator set is closed, the diesel generator set operates with load at the highest operating efficiency point, and the third switch of the diesel generator set is disconnected; When the operating power of the diesel generator set is greater than the load power, the mobile energy storage device is in a charging state; When the operating power of the diesel generator set is less than the load power, the mobile energy storage device is in a discharging state.

7. The non-stop operation method applicable to distributed photovoltaic lines according to claim 6, characterized in that: Under the third working condition, it also includes: Determine whether the state of charge of the mobile energy storage device is lower than a second preset value. If the state of charge of the mobile energy storage device is lower than the second preset value, control the mobile energy storage device to switch to a charging state, and the charging power of the mobile energy storage device does not exceed the difference between the rated power of the diesel generator set and the load power; It is determined whether the state of charge of the mobile energy storage device exceeds a third preset value. If the state of charge of the mobile energy storage device exceeds the third preset value, the mobile energy storage device is controlled to switch to a standby state.

8. The non-stop operation method applicable to distributed photovoltaic lines according to claim 6, characterized in that: Also includes: If the load power is greater than the rated power of the diesel generator set, the current operating condition is the fourth operating condition, and the diesel generator set and the mobile energy storage device are controlled under the fourth operating condition to achieve non-stop operation; Under the fourth operating condition, the diesel generator set and the mobile energy storage device adopt a constant power operation mode, and the first switch of the diesel generator set is closed. When the diesel generator set and the mobile energy storage device jointly output power to the third switch of the diesel generator set and the current is close to zero, the third switch of the diesel generator set is disconnected, and the diesel generator set is switched to a voltage source mode, and the mobile energy storage device is a power source.

9. The non-stop operation method applicable to distributed photovoltaic lines according to claim 8, characterized in that: Under the fourth working condition, it also includes: Determine whether the state of charge of the mobile energy storage device is lower than a fourth preset value. If the state of charge of the mobile energy storage device is lower than the fourth preset value, control the mobile energy storage device to stop running or deploy other mobile energy storage devices in parallel to the AC side of the diesel generator set.

10. A non-stop operation device suitable for distributed photovoltaic lines, characterized in that: include: A connection module for connecting a mobile energy storage device in parallel to the AC side of a diesel generator set; The acquisition calculation module is used to obtain the voltage and current on the load side and calculate the load power based on the voltage and current; the control module is used to determine the current working condition according to the size of the load power, and control the diesel generator set and the mobile energy storage device according to the current working condition to achieve non-stop operation.

11. The non-stop operation device applicable to distributed photovoltaic lines according to claim 10, characterized in that: The control module comprises: A first judging unit, used to judge whether the load power is a positive value; A first execution unit is used to control the diesel generator set and the mobile energy storage device to achieve non-stop operation under a first working condition when the load power is a positive value; Under the first operating condition, the first execution unit controls the mobile energy storage device to adopt a voltage source operation mode and closes the first switch of the diesel generator set; the mobile energy storage device absorbs photovoltaic reverse power.

12. The non-stop operation device applicable to distributed photovoltaic lines according to claim 11, characterized in that: The first execution unit comprises: A first state of charge determination subunit, used to determine whether the state of charge of the mobile energy storage device exceeds a first preset value; The first control subunit is used to control the mobile energy storage device to stop absorbing photovoltaic reverse power when the charge state of the mobile energy storage device exceeds a first preset value.

13. The non-stop operation device applicable to distributed photovoltaic lines according to claim 11, characterized in that: The control module also includes: A second judgment unit, used for judging whether the load power is less than the rated power of the mobile energy storage device when the load power is a positive value; A second execution unit is used to control the diesel generator set and the mobile energy storage device to achieve non-stop operation under a second working condition when the load power is less than the rated power of the mobile energy storage device; Under the second operating condition, the second execution unit controls the mobile energy storage device to adopt the voltage source operation mode, closes the first switch of the diesel generator set, the mobile energy storage device operates with load, and disconnects the third switch of the diesel generator set; the diesel generator set is in hot standby state.

14. The non-stop operation device applicable to distributed photovoltaic lines according to claim 13, characterized in that: The second execution unit further includes: A second state of charge determination subunit, used to determine whether the state of charge of the mobile energy storage device is lower than a second preset value; The second control subunit is used to start the diesel generator set when the charge state of the mobile energy storage device is lower than a second preset value, and make the output of the diesel generator set the sum of the load power and the charging power of the mobile energy storage device.

15. The non-stop operation device applicable to distributed photovoltaic lines according to claim 13, characterized in that: The control module also includes: A third judgment unit, used for judging whether the load power is less than the rated power of the diesel generator set when the load power is greater than the rated power of the mobile energy storage device; A third execution unit is used to control the diesel generator set and the mobile energy storage device to achieve non-stop operation under a third working condition when the load power is less than the rated power of the diesel generator set; Under the third operating condition, the third execution unit controls the diesel generator set to adopt the voltage source operation mode, closes the first switch of the diesel generator set, and the diesel generator set operates with load at the highest operating efficiency point, and disconnects the third switch of the diesel generator set; when the operating power of the diesel generator set is greater than the load power, the mobile energy storage device is controlled to be in a charging state; when the operating power of the diesel generator set is less than the load power, the mobile energy storage device is controlled to be in a discharging state.

16. The non-stop operation device applicable to distributed photovoltaic lines according to claim 15, characterized in that: The third execution unit further includes: A third state of charge determination subunit, used to determine whether the state of charge of the mobile energy storage device is lower than a second preset value; A third control subunit is used to control the mobile energy storage device to switch to a charging state when the state of charge of the mobile energy storage device is lower than a second preset value, and the charging power of the mobile energy storage device does not exceed the difference between the rated power of the diesel generator set and the load power; a fourth state of charge determination subunit, configured to determine whether the state of charge of the mobile energy storage device exceeds a third preset value; The fourth control subunit is used to control the mobile energy storage device to switch to a standby state when the charge state of the mobile energy storage device exceeds a third preset value.

17. The non-stop operation device applicable to distributed photovoltaic lines according to claim 15, characterized in that: The control module also includes: A fourth execution unit is used to control the diesel generator set and the mobile energy storage device to achieve non-stop operation in a fourth working condition when the load power is greater than the rated power of the diesel generator set; Under the fourth operating condition, the fourth execution unit controls the diesel generator set and the mobile energy storage device to adopt a constant power operation mode, closes the first switch of the diesel generator set, and when the diesel generator set and the mobile energy storage device jointly output power to the third switch current of the diesel generator set close to zero, the third switch of the diesel generator set is disconnected, the diesel generator set is switched to a voltage source mode, and the mobile energy storage device is a power source.

18. The non-stop operation device applicable to distributed photovoltaic lines according to claim 17, characterized in that: The fourth execution unit further includes: a fifth state of charge determination subunit, configured to determine whether the state of charge of the mobile energy storage device is lower than a fourth preset value; The fifth control subunit is used to control the mobile energy storage device to stop running or deploy other mobile energy storage devices in parallel to the AC side of the diesel generator set when the charge state of the mobile energy storage device is lower than a fourth preset value.

19. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for non-stop operation applicable to distributed photovoltaic lines as described in any one of claims 1 to 9 are implemented.

20. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for non-stop operation applicable to distributed photovoltaic lines as claimed in any one of claims 1 to 9 are implemented.

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