Optical storage power generation system communication control system and method suitable for direct current coupling mode

Abstract

The invention relates to the technical field of optical storage power generation control, in particular to an optical storage power generation system communication control system and method suitable for a direct current coupling mode. The independent communication network and control network are established, so that the response time of the system can be greatly shortened, the response speed of the system is improved, and the coordinated and synchronous operation of photovoltaic and energy storage can be better realized. The control logic instruction issuing link is simple, equipment is reduced, the equipment failure rate is reduced, and economic benefits are improved. All photovoltaic and energy storage equipment information in the communication network is acquired by the energy management unit and the MMS network and is uploaded to the power station monitoring system, so that information interaction with the power station monitoring system is realized, and local information acquisition and display are realized at the same time. And all photovoltaic and energy storage equipment information is uploaded by adopting an independent communication network channel, so that congestion of a control network channel is avoided, and the reliability and the stability of power station operation are further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic power generation control, and in particular to a photovoltaic power generation system communication control system and method suitable for a direct current coupling mode. Background Art

[0002] In the existing communication control mode of photovoltaic storage system, the photovoltaic system realizes photovoltaic inverter output control through the photovoltaic data acquisition device and photovoltaic inverter communication, and the energy storage system realizes energy storage inverter output control through the energy management unit and energy storage converter and BMS information exchange. The photovoltaic system information is uniformly collected and collected by the photovoltaic data acquisition device and then sent to the power station monitoring system. The energy storage system information is uniformly collected by the energy management unit and collected by the photovoltaic data acquisition device and then sent to the power station monitoring system. This communication control mode will lead to congestion of the communication channel of the photovoltaic data acquisition device. At the same time, energy storage has one more communication link than photovoltaic, which is bound to lead to asynchronous control of photovoltaic and energy storage output.

[0003] In summary, the existing photovoltaic storage system communication control architecture is complex, and there are many control logic instruction issuance links, which leads to long communication time, which in turn affects the control response rate, and ultimately leads to the inability of photovoltaic and energy storage to coordinate and operate synchronously. At the same time, equipment configuration redundancy will lead to an increase in the failure rate, which in turn leads to a decrease in system reliability, which is not conducive to the reliable and stable operation of the power station. Summary of the invention

[0004] In view of the above problems, the present invention provides a communication control system and method for a photovoltaic power generation system suitable for a DC coupling mode.

[0005] In a first aspect, the present invention provides a communication control system for a photovoltaic power generation system in a DC coupling mode, comprising:

[0006] The power station monitoring system is connected to the optical fiber terminal box through an optical fiber ring network;

[0007] The optical fiber terminal box is connected to the GOOSE network for transmitting control instructions and the MMS network for collecting information;

[0008] The GOOSE network is connected to photovoltaic DC / DC and photovoltaic storage synchronous generator respectively;

[0009] The MMS network is connected to photovoltaic DC / DC, photovoltaic storage synchronous generator, battery management system BMS, box transformer measurement and control, and energy management unit EMU;

[0010] The optical fiber terminal box is connected to the energy management unit EMU through the CAN optical conversion module and the fire protection system in turn;

[0011] The energy management unit EMU is connected to an electric meter, a sensor and a control system respectively.

[0012] Furthermore, the battery management system BMS is connected to a battery system for energy storage;

[0013] The battery management system BMS is coupled to the photovoltaic DC side, and the battery management system BMS is connected to a photovoltaic storage synchronous generator;

[0014] The battery management system BMS is directly connected to the DC side of the photovoltaic and storage synchronous generator. The photovoltaic and storage synchronous generator adopts photovoltaic and storage DC coupling, AC networking and virtual synchronization control.

[0015] Further, the power station monitoring system includes: AGC / AVC system, primary frequency regulation system and or cluster control system;

[0016] AGC / AVC system, primary frequency modulation system and or cluster control system, connected to the main unit of photovoltaic power generation unit;

[0017] The photovoltaic power generation unit host is connected to the adjacent sub-array optical fiber terminal box and / or the photovoltaic power station monitoring system bay optical fiber distribution frame;

[0018] The adjacent sub-array optical fiber terminal boxes and / or the optical fiber distribution frames of the photovoltaic power station monitoring system bay layer are connected to the optical fiber terminal boxes through an optical fiber ring network.

[0019] Furthermore, it also includes: a photovoltaic storage coordination control device;

[0020] The photovoltaic energy storage coordination control device receives instructions from the power station monitoring system through a fiber optic ring network, and completes the allocation and issuance of instructions to all power output devices.

[0021] Furthermore, all power output devices receive instructions from the photovoltaic and energy storage coordination control device through the GOOSE network to coordinate and control the output coordination of photovoltaic and energy storage and the charging and discharging control of energy storage;

[0022] All power output devices, including: photovoltaic synchronous generators and photovoltaic DC / DC.

[0023] Further, the GOOSE network is provided with a GOOSE network switch;

[0024] The GOOSE network adopts the IEC61850-GOOSE communication protocol.

[0025] Furthermore, there is interlocking control between the AGC / AVC system, the cluster control system and the primary frequency modulation system, and the photovoltaic energy storage coordination control device only receives instructions from one of the systems at any time.

[0026] Furthermore, all photovoltaic and energy storage equipment information is collected through the energy management unit and MMS network, and sent to the power station monitoring system through the optical fiber ring network, realizing information interaction with the power station monitoring system and realizing on-site information collection and display.

[0027] Further, the MMS network is provided with an MMS network switch;

[0028] The MMS network adopts IEC61850-MMS or IEC104 communication protocol.

[0029] Furthermore, all photovoltaic and energy storage equipment, including sub-array step-up transformers and their measurement and control devices, photovoltaic and energy storage synchronous generators, photovoltaic DC / DC, battery systems, battery management systems BMS, metering systems, distribution systems, environmental control systems, fire protection systems, lighting, and threshold switches.

[0030] In a second aspect, the present invention provides a communication control method for a photovoltaic power generation system in a DC coupling mode.

[0031] The above-mentioned communication control system for the photovoltaic power generation system suitable for the DC coupling mode is used to control the photovoltaic power generation system.

[0032] The present invention has at least the following beneficial effects:

[0033] The present invention is applicable to the communication control method of the photovoltaic energy storage power generation system in the DC coupling mode. By establishing an independent communication network and control network, the system response time can be greatly reduced, the system response speed can be improved, and the coordinated and synchronous operation of photovoltaic and energy storage can be better achieved.

[0034] The present invention controls all power output devices in the network to directly receive instructions issued by the photovoltaic storage coordination control device, coordinates and controls the output coordination of photovoltaic and energy storage and the energy storage charging and discharging control, and adopts the IEC61850-GOOSE communication protocol. The control logic instruction issuance link is simple, the equipment is reduced, the equipment failure rate is reduced, and the economic benefits are improved.

[0035] In the communication network of the present invention, all photovoltaic and energy storage equipment information is collected by the energy management unit and the MMS network, and sent to the power station monitoring system to achieve information interaction with the power station monitoring system, while achieving local information collection and display, using IEC61850-MMS or IEC104 communication protocol. All photovoltaic and energy storage equipment information is sent through a separate communication network channel to avoid congestion in the control network channel, thereby improving the reliability and stability of power station operation.

[0036] The photovoltaic storage system of the present invention adopts the method of coupling energy storage with the photovoltaic DC side, and is equipped with a photovoltaic storage synchronous generator. The energy storage system is directly connected to the DC side of the photovoltaic storage synchronous generator. The photovoltaic storage synchronous generator adopts the technology of photovoltaic storage DC coupling, AC networking, and virtual synchronous control.

[0037] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 This is a schematic diagram of the communication control architecture of the photovoltaic power generation system according to an embodiment of the present invention;

[0040] Figure 2 Schematic diagram of the communication control system architecture of the photovoltaic storage system that couples the energy storage with the photovoltaic low-voltage AC side. DETAILED DESCRIPTION

[0041] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution 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 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 are within the scope of protection of the present invention.

[0042] The existing photovoltaic storage system communication control architecture is complex, and there are many links in the issuance of control logic instructions, which leads to long communication time, thus affecting the control response rate, and ultimately causing photovoltaic and energy storage to be unable to coordinate and operate synchronously. At the same time, redundant equipment configuration will lead to an increase in the failure rate, which in turn will reduce the reliability of the system, which is not conducive to the reliable and stable operation of the power station.

[0043] To this end, the present invention proposes a communication control system and method for a photovoltaic storage power generation system in a DC coupling mode. The present invention forms an independent communication network and control network. In the control network, photovoltaic and energy storage output are directly coordinated and controlled through a photovoltaic storage coordination control device and a GOOSE network; in the communication network, all photovoltaic storage equipment information is collected through an energy management unit and an MMS network and sent to a power station monitoring system to realize information interaction with the power station monitoring system.

[0044] like Figure 1 As shown, the present invention provides a communication control system for a photovoltaic power generation system suitable for a DC coupling mode, comprising:

[0045] The power station monitoring system is connected to the optical fiber terminal box through an optical fiber ring network;

[0046] The optical fiber terminal box is connected to the GOOSE network for transmitting control instructions and the MMS network for collecting information;

[0047] The GOOSE network is connected to photovoltaic DC / DC and photovoltaic storage synchronous generator respectively;

[0048] The MMS network is connected to photovoltaic DC / DC, photovoltaic storage synchronous generator, battery management system BMS, box transformer measurement and control, and energy management unit EMU;

[0049] The optical fiber terminal box is connected to the energy management unit EMU through the CAN optical conversion module and the fire protection system in turn;

[0050] The energy management unit EMU is connected to an electric meter, a sensor and a control system respectively.

[0051] In specific implementation, the electricity meters include box-type transformer electricity meters, energy storage electricity meters and self-use electricity meters; the sensors include temperature and humidity sensors, insulation detection and transformer signal sensors; the control systems include power distribution systems, environmental control systems, lighting systems, threshold switches, metering systems, fire protection systems and UPS.

[0052] In one embodiment, the battery management system BMS is connected to a battery system for energy storage;

[0053] The battery management system BMS is coupled to the photovoltaic DC side, and the battery management system BMS is connected to a photovoltaic storage synchronous generator;

[0054] The battery management system BMS is directly connected to the DC side of the photovoltaic and storage synchronous generator. The photovoltaic and storage synchronous generator adopts photovoltaic and storage DC coupling, AC networking and virtual synchronization control.

[0055] In one embodiment, a power station monitoring system includes: an AGC / AVC system, a primary frequency modulation system and / or a cluster control system;

[0056] AGC / AVC system, primary frequency modulation system and or cluster control system, connected to the main unit of photovoltaic power generation unit;

[0057] The photovoltaic power generation unit host is connected to the adjacent sub-array optical fiber terminal box and / or the photovoltaic power station monitoring system bay optical fiber distribution frame;

[0058] The adjacent sub-array optical fiber terminal boxes and / or the optical fiber distribution frames of the photovoltaic power station monitoring system bay layer are connected to the optical fiber terminal boxes through an optical fiber ring network.

[0059] In one embodiment, it further includes: a photovoltaic energy storage coordination control device;

[0060] The photovoltaic energy storage coordination control device receives instructions from the power station monitoring system through a fiber optic ring network, and completes the allocation and issuance of instructions to all power output devices.

[0061] In one embodiment, all power output devices receive instructions issued by the photovoltaic and energy storage coordination control device through the GOOSE network to coordinate and control the output coordination of photovoltaic and energy storage and the charging and discharging control of energy storage;

[0062] All power output devices, including: photovoltaic synchronous generators and photovoltaic DC / DC.

[0063] In one embodiment, the GOOSE network is provided with a GOOSE network switch;

[0064] The GOOSE network adopts the IEC61850-GOOSE communication protocol.

[0065] In one embodiment, there is interlocking control between the AGC / AVC system, the cluster control system and the primary frequency modulation system, and the photovoltaic energy storage coordination control device only receives instructions from one of the systems at any time.

[0066] In one embodiment, all photovoltaic and energy storage equipment information is collected through the energy management unit and the MMS network, and sent to the power station monitoring system through a fiber optic ring network to achieve information interaction with the power station monitoring system and realize local information collection and display.

[0067] In one embodiment, the MMS network is provided with an MMS network switch;

[0068] The MMS network adopts IEC61850-MMS or IEC104 communication protocol.

[0069] In one embodiment, all photovoltaic and energy storage equipment, including sub-array step-up transformers and their measurement and control devices, photovoltaic and energy storage synchronous generators, photovoltaic DC / DC, battery systems, battery management systems BMS, metering systems, power distribution systems, environmental control systems, fire protection systems, lighting, and threshold switches.

[0070] The present invention provides a communication control method for a photovoltaic power generation system suitable for a DC coupling mode.

[0071] The above-mentioned communication control system for the photovoltaic power generation system suitable for the DC coupling mode is used to control the photovoltaic power generation system.

[0072] In the control method, all power output devices include photovoltaic synchronous generators and photovoltaic DC / DC, but are not limited to photovoltaic synchronous generators and photovoltaic DC / DC.

[0073] In order to enable those skilled in the art to better understand the present invention, the principle of the present invention is described as follows in conjunction with the accompanying drawings:

[0074] The present invention is aimed at a photovoltaic storage power generation system that couples energy storage with the photovoltaic DC side, and proposes a communication control method for a photovoltaic storage power generation system that is suitable for a DC coupling mode. The photovoltaic storage system is equipped with a photovoltaic storage coordination control device, an energy management unit, and is also equipped with a GOOSE network switch, an MMS network switch, an optical fiber terminal box, etc., to form an independent communication network and control network. The communication network adopts the IEC61850-MMS or IEC104 protocol, and the control network adopts the IEC61850-GOOSE protocol. The photovoltaic storage coordination control device coordinates and controls the photovoltaic and energy storage outputs, and the energy management unit collects all intelligent device information through the MMS network and sends it to the power station monitoring system. Independent communication networks and control networks can greatly reduce the system response time and improve the system response speed; simplify the entire control link, reduce equipment, and have higher economic benefits, and can better realize the coordinated and synchronous operation of photovoltaics and energy storage.

[0075] like Figure 2 As shown, the communication control system and method of the photovoltaic storage system coupled with the photovoltaic low-voltage AC side are introduced as follows:

[0076] 1. Photovoltaic storage coupling method

[0077] 1) The photovoltaic storage system adopts the method of coupling energy storage with the low-voltage AC side of photovoltaic power generation. The energy storage system is connected in parallel with the AC side of the photovoltaic inverter to the low-voltage side of the sub-array step-up transformer.

[0078] 2) The power output equipment of the photovoltaic storage system includes photovoltaic inverters and energy storage converters. Both photovoltaic inverters and energy storage converters adopt grid-following control technology.

[0079] 2. Control methods

[0080] (1) The sub-array photovoltaic data acquisition device receives the instructions issued by the power station monitoring system (i.e., AGC / AVC system) through the optical fiber ring network, and calculates the rated capacity of the sub-array step-up transformer at 1.1 times (this value can be set), and takes the minimum value of the above values ​​as the sub-array maximum grid-connected point power Pmax; at the same time, the sub-array photovoltaic data acquisition device collects the grid-connected point power Ppcc of the box transformer in real time, and completes the distribution and issuance of instructions to the photovoltaic inverter and energy management unit.

[0081] 1) If Ppcc>Pmax, the energy storage system starts charging, and the charging power Pcharge is the difference between the two. ① If the difference between the two is greater than the rated power of the energy storage system, the energy storage system charges according to the rated power and starts to limit the photovoltaic power so that the grid-connected power is equal to the maximum allowable grid-connected power Pmax of the sub-array; ② If the battery is fully charged, the energy storage system charging power is 0, and starts to limit the photovoltaic power so that the grid-connected power is equal to the maximum allowable grid-connected power Pmax of the sub-array; ③ If the difference between the two is less than the rated power of the energy storage system, the energy storage system charges according to the difference power and controls the photovoltaic power to be unlimited.

[0082] 2) If Ppcc<Pmax, the energy storage system starts to discharge, and the discharge power Pdischarge is the difference between the two. ① If the difference between the two is greater than the rated power of the energy storage system, the energy storage system discharges according to the rated power and controls the photovoltaic power generation to be unlimited; ② If the battery is in an empty state, the energy storage system discharge power is 0, and controls the photovoltaic power generation to be unlimited; ③ If the difference between the two is less than the rated power of the energy storage system, the energy storage system discharges according to the difference power and controls the photovoltaic power generation to be unlimited.

[0083] (2) The photovoltaic inverter receives the instructions issued by the photovoltaic data acquisition device through the PLC power line carrier to complete the photovoltaic power control. The energy management unit receives the instructions issued by the photovoltaic data acquisition device to complete the allocation and issuance of instructions to the energy storage converter.

[0084] (3) The energy storage inverter receives instructions from the energy management unit to complete the charging and discharging control of the energy storage system.

[0085] 3. Communication method

[0086] (1) The photovoltaic system information and 35kV step-up transformer information are collected and aggregated by the photovoltaic data collection device.

[0087] (2) The energy storage system information is collected by the energy management unit and then sent to the photovoltaic data collection device for collection.

[0088] (3) The photovoltaic data acquisition device sends all collected information to the power station monitoring system via a fiber optic ring network.

[0089] In a photovoltaic storage system that couples energy storage with the low-voltage AC side of photovoltaics, the communication control method will lead to congestion in the communication channel of the photovoltaic data acquisition device. At the same time, energy storage has one more communication link than photovoltaics, which will inevitably lead to asynchronous control of photovoltaic and energy storage output.

[0090] like Figure 1 As shown, the present invention is applicable to the communication control system and method of the photovoltaic power generation system in DC coupling mode as follows:

[0091] 1. Photovoltaic storage coupling method

[0092] 1) The photovoltaic storage system adopts the method of coupling energy storage with the photovoltaic DC side, and is equipped with a photovoltaic storage synchronous generator. The energy storage system is directly connected to the DC side of the photovoltaic storage synchronous generator. The photovoltaic storage synchronous generator adopts photovoltaic storage DC coupling, AC networking, and virtual synchronous control technology.

[0093] 2) The photovoltaic energy storage synchronous generator has grid-type control technology, which mainly includes fast inertia-frequency control, active voltage support control, transient stability control, etc.

[0094] 3) The photovoltaic and energy storage synchronous generator is organically combined with hardware design and control algorithm, and the photovoltaic and energy storage synchronous generator and energy storage system are used to build "virtual inertia" to provide active support for frequency and voltage.

[0095] 2. Control methods

[0096] (1) The photovoltaic and energy storage coordination control device receives instructions from the power station monitoring system (i.e., AGC / AVC system, primary frequency modulation system, and cluster control system) through a fiber optic ring network, and completes the allocation and issuance of instructions to all power output devices [including but not limited to photovoltaic and energy storage synchronous generators and photovoltaic DC / DC].

[0097] (2) All power output devices [including but not limited to PV-storage synchronous generators and PV DC / DC] receive instructions from the PV-storage coordination control device through the GOOSE network to coordinate and control the output coordination of PV and energy storage and the charging and discharging control of energy storage.

[0098] (3) The GOOSE network adopts the IEC61850-GOOSE communication protocol.

[0099] (4) There is interlocking control between the AGC / AVC system, cluster control system, and primary frequency modulation system. The coordinated control device only receives instructions from one of the systems at any time.

[0100] 3. Communication method

[0101] (1) Information from all photovoltaic and energy storage equipment [including sub-array step-up transformers and their measurement and control devices, photovoltaic and energy storage synchronous generators, photovoltaic DC / DC, battery systems (including battery cells, modules, etc.), battery management systems (BMS), metering systems, distribution systems, environmental control systems, fire protection systems, lighting, threshold switches, etc.] is collected by the energy management unit and the MMS network, and sent to the power station monitoring system (i.e., AGC / AVC system, primary frequency modulation system, cluster control system) through a fiber optic ring network to achieve information interaction with the power station monitoring system and local information collection and display.

[0102] (2) The MMS network adopts IEC61850-MMS or IEC104 communication protocol.

[0103] The present invention is applicable to the communication control system of the photovoltaic and energy storage power generation system in the DC coupling mode. The photovoltaic and energy storage coordination control device directly controls the active and reactive output of the power output equipment [including but not limited to the photovoltaic and energy storage synchronous generator, photovoltaic DC / DC] to realize the coordinated and synchronous operation of photovoltaic and energy storage, so that the photovoltaic and energy storage system is equivalent to a conventional power generation system with rotational inertia and active support capability.

[0104] The present invention is applicable to a communication control method of a photovoltaic power generation system in a DC coupling mode, and establishes an independent communication network and a control network.

[0105] In the control network of the present invention, photovoltaic and energy storage outputs are directly coordinated and controlled through a photovoltaic storage coordination control device and a GOOSE network, and the IEC61850-GOOSE communication protocol is adopted.

[0106] In the communication network of the present invention, all the information of the optical storage equipment is collected through the energy management unit and the MMS network and sent to the power station monitoring system to realize information interaction with the power station monitoring system, and the IEC61850-MMS or IEC104 communication protocol is adopted.

[0107] The photovoltaic storage system of the present invention adopts the method of coupling energy storage with the photovoltaic DC side, and is equipped with a photovoltaic storage synchronous generator. The energy storage system is directly connected to the DC side of the photovoltaic storage synchronous generator. The photovoltaic storage synchronous generator adopts the technology of photovoltaic storage DC coupling, AC networking, and virtual synchronous control.

[0108] The photovoltaic energy storage synchronous generator of the present invention has a grid-forming control technology, which mainly includes fast inertia-frequency control, active voltage support control, transient stability control, etc.

[0109] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. Applicable to the communication control system of photovoltaic power generation system in DC coupling mode, It is characterized in that include: The power station monitoring system is connected to the optical fiber terminal box through an optical fiber ring network; The optical fiber terminal box is connected to the GOOSE network for transmitting control instructions and the MMS network for collecting information; The GOOSE network is connected to photovoltaic DC / DC and photovoltaic storage synchronous generator respectively; The MMS network is connected to photovoltaic DC / DC, photovoltaic storage synchronous generator, battery management system BMS, box transformer measurement and control, and energy management unit EMU; The optical fiber terminal box is connected to the energy management unit EMU through the CAN optical conversion module and the fire protection system in turn; The energy management unit EMU is connected to an electric meter, a sensor and a control system respectively.

2. The communication control system for a photovoltaic power generation system suitable for a DC coupling mode according to claim 1, It is characterized in that The battery management system BMS is connected to a battery system for energy storage; The battery management system BMS is coupled to the photovoltaic DC side, and the battery management system BMS is connected to a photovoltaic storage synchronous generator; The battery management system BMS is directly connected to the DC side of the photovoltaic and storage synchronous generator. The photovoltaic and storage synchronous generator adopts photovoltaic and storage DC coupling, AC networking and virtual synchronization control.

3. The communication control system for a photovoltaic power generation system suitable for a DC coupling mode according to claim 1, It is characterized in that Power station monitoring system, including: AGC / AVC system, primary frequency regulation system and / or cluster control system; AGC / AVC system, primary frequency modulation system and or cluster control system, connected to the main unit of photovoltaic power generation unit; The photovoltaic power generation unit host is connected to the adjacent sub-array optical fiber terminal box and / or the photovoltaic power station monitoring system bay optical fiber distribution frame; The adjacent sub-array optical fiber terminal boxes and / or the optical fiber distribution frames of the photovoltaic power station monitoring system bay layer are connected to the optical fiber terminal boxes through an optical fiber ring network.

4. The communication control system for a photovoltaic power generation system suitable for a DC coupling mode according to claim 1, It is characterized in that It also includes: a photovoltaic storage coordination control device; The photovoltaic energy storage coordination control device receives instructions from the power station monitoring system through a fiber optic ring network, and completes the allocation and issuance of instructions to all power output devices.

5. The communication control system for a photovoltaic power generation system suitable for a DC coupling mode according to claim 4, It is characterized in that All power output devices receive instructions from the photovoltaic and energy storage coordination control device through the GOOSE network to coordinate and control the output coordination of photovoltaic and energy storage and the charging and discharging control of energy storage; All power output devices, including: photovoltaic synchronous generators and photovoltaic DC / DC.

6. The communication control system for a photovoltaic power generation system suitable for a DC coupling mode according to claim 5, It is characterized in that The GOOSE network is equipped with a GOOSE network switch; The GOOSE network adopts the IEC61850-GOOSE communication protocol.

7. The communication control system for a photovoltaic power generation system suitable for a DC coupling mode according to claim 4, It is characterized in that There is interlocking control between the AGC / AVC system, the cluster control system and the primary frequency modulation system, and the photovoltaic energy storage coordination control device only receives instructions from one of the systems at any time.

8. The communication control system for a photovoltaic power generation system suitable for a DC coupling mode according to claim 1, It is characterized in that All photovoltaic and energy storage equipment information is collected through the energy management unit and MMS network, and sent to the power station monitoring system through the optical fiber ring network, realizing information interaction with the power station monitoring system and realizing on-site information collection and display.

9. The communication control system for a photovoltaic power generation system suitable for a DC coupling mode according to claim 8, It is characterized in that The MMS network is provided with an MMS network switch; The MMS network adopts IEC61850-MMS or IEC104 communication protocol.

10. The communication control system for a photovoltaic power generation system suitable for a DC coupling mode according to claim 8, It is characterized in that All photovoltaic and energy storage equipment, including sub-array step-up transformers and their measurement and control devices, photovoltaic and energy storage synchronous generators, photovoltaic DC / DC, battery systems, battery management systems BMS, metering systems, distribution systems, environmental control systems, fire protection systems, lighting, and threshold switches.

11. Communication control method for photovoltaic power generation system in DC coupling mode, It is characterized in that A photovoltaic power generation system communication control system suitable for a DC coupling mode according to any one of claims 1 to 10 is used to control the photovoltaic power generation system.

Images