Multi-source coordination control cabinet and control method thereof

Abstract

The invention discloses a multi-source coordination control cabinet and a control method thereof. The multi-source coordination control cabinet comprises a first input end, a second input end, a third input end, a switch module and a control module. The first input end is connected with the optical storage system, the second input end is connected with the power grid and the third input end is connected with the generator; the first input end, the second input end and the third input end are connected with the output end of the multi-source coordination control cabinet through the switch module, and the output end is used for connecting a load; the control module is connected with the switch module and used for selecting at least one of the first input end, the second input end and the third input end to be communicated with the output end by controlling the switch module according to operation state signals of the power grid, the optical storage system and the generator. According to the invention, more types of power supplies are accessed, and when one or two power supplies fail, other power supplies can be selected to supply power to the load through the switch module, so that the power supply reliability is improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of power supply control, and in particular to a multi-source coordinated control cabinet and a control method thereof. Background Art

[0002] With the requirements of local consumption of photovoltaic energy and restrictions on access to the grid, it is necessary to make better use of photovoltaic energy and ensure the quality of the power grid. When there are emergencies such as power outages and power outages in the power grid, the reliability of the power supply system needs to be guaranteed. When the energy of the photovoltaic storage system is about to run out and the power grid is still in a power-off state, the continuity of power supply needs to be guaranteed. At present, most of the dual power switching cabinets on the market are dual power switching cabinets, which are usually photovoltaic storage systems and diesel generators, or diesel generators and power grids, or power grids and photovoltaic storage diesel generators, and the power supply reliability to the load is low. Summary of the invention

[0003] The present invention provides a multi-source coordinated control cabinet and a control method thereof, which connects to more types of power supplies. When one or two of the power supplies fail, other power supplies can be selected through a switch module to power the load, thereby improving power supply reliability.

[0004] According to one aspect of the present invention, a multi-source coordination control cabinet is provided, the multi-source coordination control cabinet comprising: a first input terminal, a second input terminal and a third input terminal, a switch module and a control module;

[0005] The first input end is connected to the photovoltaic storage system, the second input end is connected to the power grid, and the third input end is connected to the generator; the first input end, the second input end and the third input end are connected to the output end of the multi-source coordination control cabinet through the switch module, and the output end is used to connect the load;

[0006] The control module is connected to the switch module, and is used to select at least one of the first input terminal, the second input terminal and the third input terminal to be connected to the output terminal by controlling the switch module according to the operating status signals of the power grid, the photovoltaic storage system and the generator.

[0007] Optionally, the switch module includes: a photovoltaic storage circuit breaker, a power grid circuit breaker and a diesel engine circuit breaker;

[0008] The photovoltaic storage circuit breaker is connected between the first input terminal and the output terminal, the power grid circuit breaker is connected between the second input terminal and the output terminal, and the oil engine circuit breaker is connected between the third input terminal and the output terminal; the photovoltaic storage circuit breaker, the power grid circuit breaker and the oil engine circuit breaker are respectively connected to the control module.

[0009] Optionally, the switch module further comprises: a grid contactor and an oil engine contactor;

[0010] The grid contactor is connected between the grid circuit breaker and the output end, the oil engine contactor is connected between the oil engine circuit breaker and the output end, and the grid contactor and the oil engine contactor are respectively connected to the control module.

[0011] Optionally, the oil engine contactor is electrically interlocked with the grid contactor so that the oil engine contactor and the grid contactor are not closed at the same time.

[0012] Optionally, the switch module further comprises: a load circuit breaker;

[0013] The photovoltaic storage circuit breaker, the grid circuit breaker and the oil engine circuit breaker are connected to the output end through the load circuit breaker.

[0014] Optionally, the multi-source coordination control cabinet further includes a communication module, the communication module is communicatively connected to the control module, and the communication module is used to communicate and obtain operating status signals of the power grid, the photovoltaic storage system and the generator and transmit them to the control module;

[0015] The communication module is also used to communicate and obtain the power required by the load and transmit it to the photovoltaic storage system when the first input end and the second output end are connected to the output end.

[0016] According to another aspect of the present invention, a control method for a multi-source coordinated control cabinet is provided. The control method for a multi-source coordinated control cabinet is applied to the multi-source coordinated control cabinet described in any embodiment of the present invention. The control method includes:

[0017] Obtaining operating status signals of the power grid, the photovoltaic storage system and the generator;

[0018] According to the operating status signals of the power grid, the photovoltaic storage system and the generator, by controlling the switch module in the multi-source coordination control cabinet, at least one of the first input end, the second input end and the third input end of the multi-source coordination control cabinet is selected to be connected to the output end.

[0019] Optionally, the operation status signal of the power grid includes a first voltage status signal, the first voltage status signal indicating that the power grid voltage is normal; the operation status signal of the photovoltaic storage system includes a first operation status signal and a second operation status signal, the first operation status signal indicating that the photovoltaic storage system is in a non-startup state, and the second operation status signal indicating that the photovoltaic storage system is in a startable state;

[0020] The step of selecting at least one of the first input terminal, the second input terminal and the third input terminal of the multi-source coordination control cabinet to be connected to the output terminal by controlling a switch module in the multi-source coordination control cabinet according to the operation status signals of the power grid, the photovoltaic storage system and the generator comprises:

[0021] According to the first voltage state signal and the first operation state signal, selecting the second input end to be connected to the output end through the switch module;

[0022] According to the first voltage state signal and the second operation state signal, the first input end and the second input end are selected to be connected to the output end through the switch module.

[0023] Optionally, the operation status signal of the power grid includes a second voltage status signal, and the second voltage status signal indicates that the power grid voltage is abnormal; the operation status signal of the photovoltaic storage system includes a first operation status signal and a second operation status signal, and the first operation status signal indicates that the photovoltaic storage system is in a non-startup state, and the second operation status signal indicates that the photovoltaic storage system is in a startable state;

[0024] The operating state signal of the generator includes a fourth operating state signal and a fifth operating state signal, wherein the fourth operating state signal indicates that the generator is in a non-starting state, and the fifth operating state signal indicates that the generator is in a startable state;

[0025] The step of selecting at least one of the first input terminal, the second input terminal and the third input terminal of the multi-source coordination control cabinet to be connected to the output terminal by controlling a switch module in the multi-source coordination control cabinet according to the operation status signals of the power grid, the photovoltaic storage system and the generator comprises:

[0026] According to the second voltage state signal, the second operation state signal, and the fourth operation state signal, the first input end is selected to be connected to the output end through the switch module;

[0027] According to the second voltage state signal, the first operation state signal, and the fifth operation state signal, the third input end is selected to be connected to the output end through the switch module.

[0028] Optionally, the operation status signal of the photovoltaic storage system further includes a third operation status signal, and the third operation status signal represents a low power alarm of the photovoltaic storage system;

[0029] The method further comprises: controlling a switch module in the multi-source coordination control cabinet to select at least one of the first input terminal, the second input terminal and the third input terminal of the multi-source coordination control cabinet to be connected to the output terminal according to the operation status signals of the power grid, the photovoltaic storage system and the generator;

[0030] According to the second voltage state signal, the third operation state signal, and the fifth operation state signal, the first input end and the third input end are selected to be connected to the output end through the switch module.

[0031] The technical solution of the embodiment of the present invention is to select at least one of the first input terminal, the second input terminal and the third input terminal of the multi-source coordination control cabinet to be connected to the output terminal by controlling the switch module according to the operating status signals of the power grid, the photovoltaic storage system and the generator. Compared with the prior art, more types of power supplies are connected. When one or two of the power supplies fail, other power supplies can be selected through the switch module to supply power to the load, thereby improving the power supply reliability. In summary, the present invention solves the problem that the dual-power switching cabinet is usually a photovoltaic storage system and a diesel generator, or a diesel generator and a power grid, or a power grid and a photovoltaic storage diesel generator, and the power supply reliability to the load is low.

[0032] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present invention, nor are they intended to limit the scope of the present invention. Other features of the present invention will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 is a structural schematic diagram of a multi-source coordinated control cabinet provided according to an embodiment of the present invention;

[0035] Figure 2 is a structural schematic diagram of another multi-source coordinated control cabinet provided according to an embodiment of the present invention;

[0036] Figure 3 is a structural schematic diagram of another multi-source coordinated control cabinet provided according to an embodiment of the present invention;

[0037] Figure 4 is an electrical schematic diagram of a multi-source coordinated control cabinet provided according to an embodiment of the present invention;

[0038] Figure 5 is a flow chart of a control method of a multi-source coordinated control cabinet provided according to an embodiment of the present invention;

[0039] Figure 6 is a control logic schematic diagram of a multi-source coordinated control cabinet provided according to an embodiment of the present invention;

[0040] Figure 7 is a control logic principle diagram of another multi-source coordinated control cabinet provided according to an embodiment of the present invention;

[0041] Figure 8 This is a control logic schematic diagram of another multi-source coordinated control cabinet provided according to an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0044] Figure 1 is a schematic diagram of a multi-source coordinated control cabinet provided according to an embodiment of the present invention, with reference to Figure 1 , an embodiment of the present invention provides a multi-source coordinated control cabinet, the multi-source coordinated control cabinet comprising: a first input terminal 1, a second input terminal 2 and a third input terminal 3, a switch module 10 and a control module 20;

[0045] The first input terminal 1 is connected to the photovoltaic storage system, the second input terminal 2 is connected to the power grid, and the third input terminal 3 is connected to the generator; the first input terminal 1, the second input terminal 2 and the third input terminal 3 are connected to the output terminal 4 of the multi-source coordination control cabinet through the switch module 10, and the output terminal 4 is used to connect the load;

[0046] The control module 20 is connected to the switch module 10, and is used to select at least one of the first input terminal 1, the second input terminal 2 and the third input terminal 3 to be connected to the output terminal 4 by controlling the switch module 10 according to the operating status signals of the power grid, the photovoltaic storage system and the generator.

[0047] Specifically, the control module 20 may be a controller, and the generator may be a diesel generator. The control module 20 may obtain the operating status signals of the power grid, the photovoltaic storage system, and the generator in real time by connecting to the dry contacts on the external power supply device or by means of communication. The power supply connected to the multi-source coordinated control cabinet includes the photovoltaic storage system, the power grid, and the generator. Under normal circumstances, the switch module may be controlled to select the first input terminal 1 to be connected to the output terminal 4, and the photovoltaic storage system supplies power to the load. Alternatively, the switch module may be controlled to select the second input terminal 2 to be connected to the output terminal 4, and the power grid supplies power to the load. Alternatively, the switch module may be controlled to select the third input terminal 3 to be connected to the output terminal 4, and the generator supplies power to the load. In the case of a failure in one or both of the power supplies in the photovoltaic storage system, the power grid, and the generator, other power supplies may be selected through the switch module to supply power to the load.

[0048] Exemplarily, when the grid voltage is operating normally and the photovoltaic storage system is in a non-startup state, the switch module 10 is controlled to select the second input terminal 2 to be connected to the output terminal 4, and the grid supplies power to the load.

[0049] When the grid voltage is in normal operation and the photovoltaic storage system is in a start-up state, the grid and the photovoltaic storage system jointly supply power to the load by controlling the switch module 10 to select the first input terminal 1 and the second input terminal 2 to be connected to the output terminal 4. When the grid and the photovoltaic storage system are in normal operation, the grid and the photovoltaic storage system jointly supply power to the load, which can better utilize the green energy of the photovoltaic storage system, improve the utilization rate of the photovoltaic storage system, and reduce the construction cost.

[0050] When the grid voltage is in an abnormal operating state, the photovoltaic storage system is in a start-up state and the generator is in a non-start-up state, the first input terminal 1 is connected to the output terminal 4 by controlling the switch module 10, and the photovoltaic storage system is off-grid to supply power to the load. The photovoltaic storage system has the function of automatically switching to an off-grid state when the grid loses power, and a small microgrid is constructed by the photovoltaic storage system. The power of the photovoltaic storage system is limited. When connected to the grid, it cannot provide energy for the entire grid. When the grid loses power, it must cut off the connection with the grid and establish a microgrid system independent of the grid to ensure the continuity of power supply to the load. When there are emergencies such as power outages and power outages in the grid, the photovoltaic storage system has the function of automatically switching to an off-grid state when the grid loses power, which can ensure the reliability of power supply.

[0051] When the operating state of the grid voltage is abnormal, the photovoltaic storage system is in a start-up state and is in a low-power state, and the generator is in a start-up state, the first input terminal 1 and the third input terminal 3 are connected to the output terminal 4 by controlling the switch module 10, and the photovoltaic storage system and the generator jointly supply power to the load.

[0052] When the energy of the photovoltaic storage system is about to run out and the grid is still in a power-off state, by adding a generator power supply circuit and providing an interface with the generator, the generator has an automatic start and stop function to ensure the continuity of power supply. The combination of the generator and the photovoltaic storage system fully utilizes the power generation characteristics of the two to form a complementary relationship, improves the power supply efficiency, and has good economic efficiency.

[0053] When the grid voltage is operating abnormally, the photovoltaic storage system is in a non-startup state and the generator is in a startup state, the third input terminal 3 is connected to the output terminal 4 by controlling the switch module 10, and the generator supplies power to the load.

[0054] The technical solution of the embodiment of the present invention is to select at least one of the first input terminal, the second input terminal and the third input terminal of the multi-source coordination control cabinet to be connected to the output terminal by controlling the switch module according to the operating status signals of the power grid, the photovoltaic storage system and the generator. Compared with the prior art, more types of power supplies are connected. When one or two of the power supplies fail, other power supplies can be selected through the switch module to supply power to the load, thereby improving the power supply reliability. In summary, the present invention solves the problem that the dual-power switching cabinet is usually a photovoltaic storage system and a diesel generator, or a diesel generator and a power grid, or a power grid and a photovoltaic storage diesel generator, and the power supply reliability to the load is low.

[0055] Figure 2 is a schematic diagram of the structure of another multi-source coordinated control cabinet provided according to an embodiment of the present invention, referring to Figure 2 Optionally, the switch module 10 includes: a photovoltaic storage circuit breaker Q PCS , Grid circuit breaker Q Grid And oil machine circuit breaker Q DG ;

[0056] Solar storage circuit breaker Q PCS Connected between the first input terminal 1 and the output terminal 4, the grid circuit breaker is connected between the second input terminal 2 and the output terminal 4, and the oil machine circuit breaker is connected between the third input terminal 3 and the output terminal 4; the photovoltaic storage circuit breaker Q PCS , Grid circuit breaker Q Grid And oil machine circuit breaker Q DG They are respectively connected to the control modules 20 .

[0057] Specifically, when the grid voltage is in normal operation and the photovoltaic storage system is in a non-startup state, the control module 20 controls the grid circuit breaker QGrid If closed, the grid supplies power to the load.

[0058] When the grid voltage is in normal operation and the photovoltaic storage system is in a startup state, the control module 20 controls the photovoltaic storage circuit breaker Q PCS Close, grid circuit breaker Q Grid When closed, the solar energy storage system and the power grid jointly supply power to the load.

[0059] When the grid voltage is in an abnormal state, the photovoltaic storage system is in a start-up state and the generator is in a non-start-up state, the control module 20 controls the photovoltaic storage circuit breaker Q PCS If closed, the photovoltaic storage system is off-grid to supply power to the load.

[0060] When the grid voltage is abnormal, the photovoltaic storage system is in a start-up state and is in a low power state, and the generator is in the start-up state, the control module 20 controls the photovoltaic storage circuit breaker Q PCS Close, oil machine circuit breaker Q DG When closed, the photovoltaic storage system and the generator jointly supply power to the load.

[0061] When the grid voltage is abnormal, the photovoltaic storage system is in a non-startup state and the generator is in a start-up state, the control module 20 controls the oil generator circuit breaker Q DG When closed, the generator supplies power to the load.

[0062] Or, solar storage circuit breaker Q PCS , Grid circuit breaker Q Grid And oil machine circuit breaker Q DG It can also be in the normally closed state. PCS , Grid circuit breaker Q Grid And oil machine circuit breaker Q DG They are respectively connected to the control module 20 and can also perform analog input (AI) sampling of voltage and current.

[0063] Figure 3 is a schematic diagram of the structure of another multi-source coordinated control cabinet provided according to an embodiment of the present invention, referring to Figure 3 Optionally, the switch module 10 further includes: a grid contactor QS DG Oil engine contactor QS Grid ;

[0064] Grid contactor QS DG Connect to the grid circuit breaker Q Grid Between the output terminal 4, the oil engine contactor QS Grid Connect to oil machine circuit breaker Q DG Between the output terminal 4, the grid contactor QS DGOil engine contactor QS Grid They are respectively connected to the control modules 20 .

[0065] Specifically, when the grid voltage is in normal operation and the photovoltaic storage system is in a non-startup state, the control module 20 controls the grid circuit breaker Q Grid Close, the control module 20 controls the grid circuit breaker Q Grid and grid contactor QS DG When closed, the grid supplies power to the load.

[0066] When the grid voltage is abnormal, the photovoltaic storage system is in a non-startup state and the generator is in a start-up state, the control module 20 controls the oil generator circuit breaker Q DG Oil engine contactor QS Grid When closed, the generator supplies power to the load. Alternatively, the grid contactor QS DG Oil engine contactor QS Grid In normally open state.

[0067] Grid contactor QS DG Oil engine contactor QS Grid They are connected to the control module 20 respectively, and can sample the switch position digital input (DI) signal to judge and verify the grid contactor QS DG Oil engine contactor QS Grid The control module 20 simultaneously outputs the position state of each switch in the multi-source coordinated control cabinet for display in the background.

[0068] Continue to refer Figure 3 , optionally, oil engine contactor QS Grid With grid contactor QS DG Electrical interlock to make the oil machine contactor QS Grid and grid contactor QS DG Not closed at the same time.

[0069] Specifically, in order to adapt to more types of generators (diesel generators) and prevent the possibility of the grid and generator supplying power to the load at the same time and misoperation when the generator has no synchronization function, a grid contactor QS is added. DG Oil engine contactor QS Grid Electrical interlock function.

[0070] The switching process of the multi-source coordination control cabinet can achieve automatic switching and provide manual operation. In order to prevent the photovoltaic storage system from being out of sync with the power grid or generator power supply under manual operation control, a shutdown interlock of the photovoltaic storage system power conversion system (Power Conversion System, PCS) is added.

[0071] Continue to refer Figure 3 Optionally, the switch module 10 further includes: a load circuit breaker Q Load ;

[0072] Solar storage circuit breaker Q PCS , Grid circuit breaker Q Grid And oil machine circuit breaker Q DG Through the load breaker Q Load Connect output 4.

[0073] Specifically, the control module 20 controls the photovoltaic storage circuit breaker Q PCS , Grid circuit breaker Q Grid , Oil machine circuit breaker Q DG and load breaker Q Load Close, grid contactor QS DG Or oil engine contactor QS Grid When closed, at least one of the solar storage system, the power grid and the generator can be selected to supply power to the load. Alternatively, the load circuit breaker Q Load In normally closed state.

[0074] Figure 4 is an electrical schematic diagram of a multi-source coordinated control cabinet provided according to an embodiment of the present invention, with reference to Figure 4 Optionally, the multi-source coordinated control cabinet further includes a communication module 30, which is communicatively connected to the control module 20, and the communication module 30 is used to communicate and obtain the operating status signals of the power grid, the photovoltaic storage system and the generator and transmit them to the control module 20;

[0075] The communication module 30 is also used to communicate and obtain the power required by the load and transmit it to the photovoltaic storage system when the first input terminal 1 and the second output terminal 2 are connected to the output terminal 4.

[0076] Specifically, when the photovoltaic storage system is connected to the power grid, the quality of the power grid must be guaranteed. When the photovoltaic storage system and the power grid are jointly powered, each power supply in the multi-source coordinated control cabinet has high-precision bidirectional power sampling, and the power of the load is sampled through multi-channel sampling and the logic program embedded in the communication module, and the PCS in the photovoltaic storage system is communicated in real time to send the real-time power required by the load, accurately control the output of photovoltaic energy in the photovoltaic storage system, and ensure that the photovoltaic energy does not flow back to the power grid.

[0077] In addition, some power supply devices cannot communicate directly with the control module 20, but can communicate with the communication module 30, and sampling control can be performed through the communication module 30, thereby increasing the reliability and applicability of the power supply devices.

[0078] Figure 4The communication module 30 in the embodiment uses 1 CAN and 3 RS485 interfaces for external communication. The first RS485 interface communicates with the optical storage system, the second RS485 interface communicates with the oil engine, the third RS485 interface is a reserved interface, and 1 CAN is a reserved interface.

[0079] Figure 5 is a flow chart of a control method of a multi-source coordinated control cabinet provided according to an embodiment of the present invention, with reference to Figure 5 The embodiment of the present invention further provides a control method of a multi-source coordinated control cabinet. The control method of the multi-source coordinated control cabinet is applied to the multi-source coordinated control cabinet of any embodiment of the present invention. The control method includes:

[0080] S110, obtaining operation status signals of the power grid, the photovoltaic storage system and the generator.

[0081] Specific, combined Figure 4 The control module 20 can obtain the operating status signals of the power grid, the photovoltaic storage system and the generator in real time by connecting to the dry contacts on the external power supply equipment or by communication.

[0082] S120, according to the operating status signals of the power grid, the photovoltaic storage system and the generator, by controlling the switch module in the multi-source coordination control cabinet, select at least one of the first input terminal, the second input terminal and the third input terminal of the multi-source coordination control cabinet to be connected to the output terminal.

[0083] Specific, combined Figure 4 , the power supply connected to the multi-source coordinated control cabinet includes the photovoltaic storage system, the power grid and the generator. Under normal circumstances, the switch module can be controlled to select the first input terminal 1 to be connected to the output terminal 4, and the photovoltaic storage system supplies power to the load. Alternatively, the switch module can be controlled to select the second input terminal 2 to be connected to the output terminal 4, and the power grid supplies power to the load. Alternatively, the switch module can be controlled to select the third input terminal 3 to be connected to the output terminal 4, and the generator supplies power to the load. In the event of a failure in one or both of the power sources in the photovoltaic storage system, the power grid and the generator, other power sources can be selected through the switch module to supply power to the load.

[0084] Exemplarily, when the grid voltage is operating normally and the photovoltaic storage system is in a non-startup state, the switch module 10 is controlled to select the second input terminal 2 to be connected to the output terminal 4, and the grid supplies power to the load.

[0085] When the grid voltage is operating normally and the photovoltaic storage system is in a start-up state, the first input terminal 1 and the second input terminal 2 are connected to the output terminal 4 by controlling the switch module 10, and the grid and the photovoltaic storage system jointly supply power to the load.

[0086] When the grid voltage is operating abnormally, the photovoltaic storage system is in a start-up state and the generator is in a non-start-up state, the switch module 10 is controlled to select the first input terminal 1 to be connected to the output terminal 4, and the photovoltaic storage system is off-grid to supply power to the load.

[0087] When the operating state of the grid voltage is abnormal, the photovoltaic storage system is in a start-up state and is in a low-power state, and the generator is in a start-up state, the first input terminal 1 and the third input terminal 3 are connected to the output terminal 4 by controlling the switch module 10, and the photovoltaic storage system and the generator jointly supply power to the load.

[0088] When the grid voltage is operating abnormally, the photovoltaic storage system is in a non-startup state and the generator is in a startup state, the third input terminal 3 is connected to the output terminal 4 by controlling the switch module 10, and the generator supplies power to the load.

[0089] The control method of the multi-source coordinated control cabinet provided in an embodiment of the present invention is used to control the multi-source coordinated control cabinet provided in any embodiment of the present invention. Therefore, the control method of the multi-source coordinated control cabinet provided in an embodiment of the present invention also has the beneficial effects described in the above embodiments, which will not be repeated here.

[0090] On the basis of the above embodiments, the embodiment of the present invention further refines step S120, which is described in detail below, but is not intended to limit the present invention.

[0091] Optionally, the operation status signal of the power grid includes a first voltage status signal, the first voltage status signal indicates that the power grid voltage is normal; the operation status signal of the photovoltaic storage system includes a first operation status signal and a second operation status signal, the first operation status signal indicates that the photovoltaic storage system is in a non-startup state, and the second operation status signal indicates that the photovoltaic storage system is in a startable state;

[0092] S120, according to the operation status signals of the power grid, the photovoltaic storage system and the generator, by controlling the switch module in the multi-source coordination control cabinet to select at least one of the first input terminal, the second input terminal and the third input terminal of the multi-source coordination control cabinet to be connected to the output terminal, including:

[0093] a1) According to the first voltage state signal and the first operation state signal, the second input end is selected to be connected to the output end through the switch module.

[0094] Specific, combined Figure 4 When the grid voltage is normal and the photovoltaic storage system is in a non-startup state, the second input terminal 2 is connected to the output terminal 4 through the switch module 10, and the grid supplies power to the load.

[0095] a2) According to the first voltage state signal and the second operation state signal, the switch module selects the first input end and the second input end to be connected to the output end.

[0096] Specific, combined Figure 4 When the grid voltage is in normal operation and the photovoltaic storage system is in a startup state, the first input terminal 1 and the second input terminal 2 are connected to the output terminal 4 by controlling the switch module 10, and the grid and the photovoltaic storage system jointly supply power to the load.

[0097] On the basis of the above embodiments, the embodiment of the present invention further refines step S120, which is described in detail below, but is not intended to limit the present invention.

[0098] Optionally, the operation status signal of the power grid includes a second voltage status signal, the second voltage status signal indicates that the power grid voltage is abnormal; the operation status signal of the photovoltaic storage system includes a first operation status signal and a second operation status signal, the first operation status signal indicates that the photovoltaic storage system is in a non-startup state, and the second operation status signal indicates that the photovoltaic storage system is in a startable state;

[0099] The operation state signal of the generator includes a fourth operation state signal and a fifth operation state signal, the fourth operation state signal indicates that the generator is in a non-startup state, and the fifth operation state signal indicates that the generator is in a startable state;

[0100] S120, according to the operation status signals of the power grid, the photovoltaic storage system and the generator, by controlling the switch module in the multi-source coordination control cabinet to select at least one of the first input terminal, the second input terminal and the third input terminal of the multi-source coordination control cabinet to be connected to the output terminal, including:

[0101] b1) According to the second voltage state signal, the second operation state signal, and the fourth operation state signal, the first input end is selected to be connected to the output end through the switch module.

[0102] Specific, combined Figure 4 When the operating state of the grid voltage is abnormal, the photovoltaic storage system is in a start-up state and the generator is in a non-start-up state, the first input terminal 1 is connected to the output terminal 4 by controlling the switch module 10, and the photovoltaic storage system is off-grid to supply power to the load.

[0103] b2) According to the second voltage state signal, the first operation state signal, and the fifth operation state signal, the third input end is selected to be connected to the output end through the switch module.

[0104] Specific, combined Figure 4When the grid voltage is in an abnormal operating state, the photovoltaic storage system is in a non-startup state and the generator is in a startup state, the third input terminal 3 is connected to the output terminal 4 by controlling the switch module 10, and the generator supplies power to the load.

[0105] On the basis of the above embodiments, the embodiment of the present invention further refines step S120, which is described in detail below, but is not intended to limit the present invention.

[0106] Optionally, the operation status signal of the photovoltaic storage system further includes a third operation status signal, and the third operation status signal represents a low power alarm of the photovoltaic storage system;

[0107] S120, according to the operation status signals of the power grid, the photovoltaic storage system and the generator, by controlling the switch module in the multi-source coordination control cabinet, selecting at least one of the first input terminal, the second input terminal and the third input terminal of the multi-source coordination control cabinet to be connected to the output terminal, further comprising:

[0108] c) According to the second voltage state signal, the third operation state signal, and the fifth operation state signal, the first input end and the third input end are selected to be connected to the output end through the switch module.

[0109] Specific, combined Figure 4 When the operating state of the grid voltage is abnormal, the photovoltaic storage system is in a start-up state and is in a low-power state, and the generator is in a start-up state, the first input terminal 1 and the third input terminal 3 are connected to the output terminal 4 by controlling the switch module 10, and the photovoltaic storage system and the generator jointly supply power to the load.

[0110] Combination Figure 1 Optionally, the control method of the multi-source coordinated control cabinet also includes: according to the operating status signals of the power grid, the photovoltaic storage system and the generator, when the operating status signals of the power grid, the photovoltaic storage system and the generator are all abnormal, controlling the switch module 10 in the multi-source coordinated control cabinet to disconnect the first input terminal 1, the second input terminal 2 and the third input terminal 3 in the multi-source coordinated control cabinet from the output terminal 4.

[0111] Specifically, when the operating state of the grid voltage is abnormal, the operating state of the photovoltaic storage system is a state that cannot be started, and the operating state of the generator is a state that cannot be started, the first input terminal 1, the second input terminal 2 and the third input terminal 3 in the multi-source coordination control cabinet are disconnected from the output terminal 4 through the switch module 10, and power supply to the load is stopped.

[0112] Figure 6 is a control logic schematic diagram of a multi-source coordinated control cabinet provided according to an embodiment of the present invention, with reference to Figure 6 and Figure 4 , it should be noted that Figure 4DO1, DO2, DO3, and DO4 are switch digital output (DigitalOutput, DO) signals of the control module 20. Optionally, the corresponding information can be represented by whether the DO1, DO2, DO3, and DO4 signals are output, for example: output / non-output of the DO1 signal represents system failure / normal; output / non-output of the DO2 signal represents power grid abnormality / normal; output / non-output of the DO3 signal represents the start / shutdown of the photovoltaic storage system; output / non-output of the DO4 signal represents the start / stop of the oil engine. Optionally, the corresponding information can also be represented by the intensity, size, etc. of the output DO1, DO2, DO3, and DO4 signals, for example: when the output DO1 signal is high level / low level, it represents system failure / normal.

[0113] It can be understood that, in one embodiment, the control module 20 converts the corresponding signal into switch quantity DO1, DO2, DO3, DO4 signals by controlling switches such as relays, and then outputs them.

[0114] Exemplarily, the control module 20 controls the first normally open relay. When the first normally open relay is closed (i.e., when it is in motion), a DO1 signal is output, indicating a system failure. If the first normally open relay does not work, no DO1 signal is output, indicating that the system is normal. The DO1 signal is output to the background or control system for alarm prompts, and the signal can also be used as a backup signal for communication signals.

[0115] Exemplarily, the control module 20 controls the second normally open relay. When the second normally open relay is closed (i.e., in action), the DO2 signal is output, indicating that the power grid is abnormal. If the second normally open relay does not act, the DO2 signal is not output, indicating that the power grid is normal. The DO2 signal is output to the photovoltaic storage system, which requires the signal to switch the alarm and control logic. The signal can also be used as a backup signal for the communication signal.

[0116] Exemplarily, the control module 20 controls the third normally open relay. When the third normally open relay is closed (i.e., in motion), the DO3 signal is output, indicating that the photovoltaic storage system is turned on; if the third normally open relay is not in motion, the DO3 signal is not output, indicating that the photovoltaic storage system is turned off. The DO3 signal is output to the photovoltaic storage system and is used to turn the photovoltaic storage system on and off. The signal can also be used as a backup signal for the communication signal.

[0117] For example, the control module 20 controls the fourth normally open relay. When the fourth normally open relay is closed (i.e., in motion), the DO4 signal is output, indicating that the oil engine is started; if the fourth normally open relay is not in motion, the DO4 signal is not output, indicating that the oil engine is stopped. The DO4 signal is output to the oil engine system for starting and stopping the oil engine, and the signal can also be used as a backup signal for the communication signal.

[0118] It is understandable that the first to fourth normally open relays are not shown in the figure, and the first to fourth normally open relays can be four completely independent relays or integrated into one module. The first to fourth normally open relays can also be replaced by other types of relays or switches, which is not limited here.

[0119] The photovoltaic storage system PCS cannot be started signal DI1, the photovoltaic storage system low power alarm signal DI3, and the oil engine cannot be started signal DI2 are digital input (DI) signals of external device status quantities sampled by the control module 20.

[0120] First, the system is powered on for self-check; if the system fails, the first normally open relay is activated, and the control module 20 outputs the DO1 signal. Then the grid voltage is detected. If the grid voltage is normal, the grid contactor is closed, the second normally open relay, the third normally open relay, and the fourth normally open relay do not operate, and the control module 20 does not output the DO2 signal, the DO3 signal, and the DO4 signal, then only the grid supplies power to the load.

[0121] If DI1 is detected to be valid (the PV storage system PCS cannot be turned on), the second normally open relay, the third normally open relay, and the fourth normally open relay will not operate (the power grid is normal, the PV storage system PCS is turned off, and the oil generator is stopped), and only the power grid is used for power supply.

[0122] If DI1 is detected to be invalid (the PV storage system PCS can be turned on), the third normally open relay will be activated, the second normally open relay and the fourth normally open relay will not be activated (the power grid is normal, the PV storage system PCS is turned on, and the oil generator is stopped), and the PV storage system and the power grid jointly supply power to the load (the PV storage system and the power grid operate).

[0123] Figure 7 is a control logic schematic diagram of another multi-source coordinated control cabinet provided according to an embodiment of the present invention, referring to Figure 7 and Figure 4 First, the system is powered on for self-check; if the system has a fault, the first normally open relay is activated, and the control module 20 outputs the DO1 signal. Then the grid voltage is detected. If the grid voltage is abnormal, the grid contactor is opened, the second normally open relay is activated, the third normally open relay remains activated, and the fourth normally open relay does not operate. The control module 20 outputs the DO2 signal, outputs the DO3 signal, and does not output the DO4 signal. Only the photovoltaic storage system supplies power to the load (the photovoltaic storage system operates off the grid).

[0124] If the grid contactor is open, the second normally open relay is activated, the third normally open relay, and the fourth normally open relay remain inactive. The detection input DI1 is invalid (the PV storage system PCS can be turned on). The second normally open relay is detected, the third normally open relay is activated, and the fourth normally open relay is inactive (grid abnormality, PV storage system PCS is turned on, and the diesel generator is stopped), and only the PV storage system supplies power to the load (the PV storage system is off-grid).

[0125] Then, the detection input DI3 is valid (the PV system battery voltage is low alarm), the detection input DI2 is valid (the oil generator cannot be started), the second normally open relay is actuated, the third normally open relay is maintained, and the fourth normally open relay is inactive (grid abnormality, PV system PCS is turned on, and the oil generator is shut down), and only the PV system supplies power to the load (the PV system is off-grid). It should be noted that: when the PV system battery voltage is low alarm, the PV system battery voltage PCS is kept turned on until the PV system battery SOC drops to the value that needs to be shut down (at this time, the PV system will give a signal that it cannot be started), and then a shutdown signal will be given.

[0126] If input DI2 is invalid (the oil generator can be started), the second normally open relay and the fourth normally open relay will be activated, and the third normally open relay will not be activated (the power grid is abnormal, the PCS of the photovoltaic storage system is shut down, and the oil generator is started). The oil generator voltage is detected and the oil generator voltage is normal. The third normally open relay will not be activated (the PCS of the photovoltaic storage system is shut down) and the oil generator contactor will be closed, and only the oil generator will supply power to the load. If the detection of DI1 is valid (the PCS of the photovoltaic storage system cannot be started), only the oil generator will supply power to the load; if the detection of DI1 is invalid (the PCS of the photovoltaic storage system can be started), the second normally open relay, the third normally open relay, and the fourth normally open relay will be activated (the power grid is abnormal, the PCS of the photovoltaic storage system is started, and the oil generator is started), and the control module outputs DO2 signal, DO3 signal, and DO4 signal, then the photovoltaic storage system and the oil generator will jointly supply power to the load (the photovoltaic storage system and the oil generator run).

[0127] Figure 8 is a control logic schematic diagram of another multi-source coordinated control cabinet provided according to an embodiment of the present invention, referring to Figure 8 and Figure 4 First, power on to perform a system self-check; if the system has a fault, output DO1 will be activated. Then detect the grid voltage. If the grid voltage is abnormal, the grid contactor will be opened, the second normally open relay will be activated, the third normally open relay, and the fourth normally open relay will remain inactive. Detect DI1 to be valid (the photovoltaic storage system PCS cannot be started), detect DI2 to be invalid (the oil generator can be started), the second normally open relay and the fourth normally open relay will be activated, and the third normally open relay will not be activated (the grid is abnormal, the photovoltaic storage system PCS is shut down, and the oil generator is started). The control module 20 outputs the DO2 signal, does not output the DO3 signal, and outputs the DO4 signal. Detect the oil generator voltage. If the oil generator voltage is normal, the oil generator contactor will be closed, and only the oil generator will supply power to the load (the oil generator is running).

[0128] If DI2 is detected to be valid (the oil engine cannot be started), the second normally open relay is actuated, the third normally open relay and the fourth normally open relay are not actuated (the power grid is abnormal, the photovoltaic storage system PCS is shut down, and the oil engine is stopped), the control module 20 outputs the DO2 signal, does not output the DO3 signal, does not output the DO4 signal, and the power is cut off.

[0129] The above specific implementations do not constitute a limitation on the protection scope of the present invention. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-source coordinated control cabinet, characterized in that: include: A first input terminal, a second input terminal, a third input terminal, a switch module and a control module; The first input end is connected to the photovoltaic storage system, the second input end is connected to the power grid, and the third input end is connected to the generator; the first input end, the second input end and the third input end are connected to the output end of the multi-source coordination control cabinet through the switch module, and the output end is used to connect the load; The control module is connected to the switch module, and is used to select at least one of the first input terminal, the second input terminal and the third input terminal to be connected to the output terminal by controlling the switch module according to the operating status signals of the power grid, the photovoltaic storage system and the generator.

2. The multi-source coordination control cabinet according to claim 1, characterized in that: The switch module includes: a photovoltaic storage circuit breaker, a power grid circuit breaker and a diesel engine circuit breaker; The photovoltaic storage circuit breaker is connected between the first input terminal and the output terminal, the power grid circuit breaker is connected between the second input terminal and the output terminal, and the oil engine circuit breaker is connected between the third input terminal and the output terminal; the photovoltaic storage circuit breaker, the power grid circuit breaker and the oil engine circuit breaker are respectively connected to the control module.

3. The multi-source coordination control cabinet according to claim 2, characterized in that: The switch module also includes: a power grid contactor and an oil engine contactor; The grid contactor is connected between the grid circuit breaker and the output end, the oil engine contactor is connected between the oil engine circuit breaker and the output end, and the grid contactor and the oil engine contactor are respectively connected to the control module.

4. The multi-source coordination control cabinet according to claim 3, characterized in that: The oil engine contactor is electrically interlocked with the grid contactor so that the oil engine contactor and the grid contactor are not closed at the same time.

5. The multi-source coordination control cabinet according to claim 2, characterized in that: The switch module further includes: a load circuit breaker; The photovoltaic storage circuit breaker, the grid circuit breaker and the oil engine circuit breaker are connected to the output end through the load circuit breaker.

6. The multi-source coordination control cabinet according to claim 1, characterized in that: It also includes a communication module, which is communicatively connected to the control module, and is used to communicate and obtain operating status signals of the power grid, the photovoltaic storage system, and the generator, and transmit them to the control module; The communication module is also used to communicate and obtain the power required by the load and transmit it to the photovoltaic storage system when the first input end and the second output end are connected to the output end.

7. A control method for a multi-source coordinated control cabinet, characterized in that: Applied to the multi-source coordinated control cabinet according to any one of claims 1 to 6, the control method comprises: Obtaining operating status signals of the power grid, the photovoltaic storage system and the generator; According to the operating status signals of the power grid, the photovoltaic storage system and the generator, by controlling the switch module in the multi-source coordination control cabinet, at least one of the first input end, the second input end and the third input end of the multi-source coordination control cabinet is selected to be connected to the output end.

8. The control method of the multi-source coordinated control cabinet according to claim 7, characterized in that: The operation status signal of the power grid includes a first voltage status signal, and the first voltage status signal indicates that the power grid voltage is normal; the operation status signal of the photovoltaic storage system includes a first operation status signal and a second operation status signal, and the first operation status signal indicates that the photovoltaic storage system is in a non-startup state, and the second operation status signal indicates that the photovoltaic storage system is in a startable state; The step of selecting at least one of the first input terminal, the second input terminal and the third input terminal of the multi-source coordination control cabinet to be connected to the output terminal by controlling a switch module in the multi-source coordination control cabinet according to the operation status signals of the power grid, the photovoltaic storage system and the generator comprises: According to the first voltage state signal and the first operation state signal, selecting the second input end to be connected to the output end through the switch module; According to the first voltage state signal and the second operation state signal, the first input end and the second input end are selected by the switch module to be connected to the output end.

9. The control method of the multi-source coordinated control cabinet according to claim 7, characterized in that: The operation status signal of the power grid includes a second voltage status signal, and the second voltage status signal indicates that the power grid voltage is abnormal; the operation status signal of the photovoltaic storage system includes a first operation status signal and a second operation status signal, and the first operation status signal indicates that the photovoltaic storage system is in a non-startup state, and the second operation status signal indicates that the photovoltaic storage system is in a startable state; The operating state signal of the generator includes a fourth operating state signal and a fifth operating state signal, wherein the fourth operating state signal indicates that the generator is in a non-starting state, and the fifth operating state signal indicates that the generator is in a startable state; The step of selecting at least one of the first input terminal, the second input terminal and the third input terminal of the multi-source coordination control cabinet to be connected to the output terminal by controlling a switch module in the multi-source coordination control cabinet according to the operation status signals of the power grid, the photovoltaic storage system and the generator comprises: According to the second voltage state signal, the second operation state signal, and the fourth operation state signal, the first input end is selected to be connected to the output end through the switch module; According to the second voltage state signal, the first operation state signal, and the fifth operation state signal, the third input end is selected to be connected to the output end through the switch module.

10. The control method of the multi-source coordinated control cabinet according to claim 9, characterized in that: The operation status signal of the photovoltaic storage system further includes a third operation status signal, wherein the third operation status signal indicates a low power alarm of the photovoltaic storage system; The method further comprises: controlling a switch module in the multi-source coordination control cabinet to select at least one of the first input terminal, the second input terminal and the third input terminal of the multi-source coordination control cabinet to be connected to the output terminal according to the operation status signals of the power grid, the photovoltaic storage system and the generator; According to the second voltage state signal, the third operation state signal, and the fifth operation state signal, the first input end and the third input end are selected to be connected to the output end through the switch module.

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