Panoramic monitoring system and method suitable for photovoltaic station

Abstract

The invention relates to the technical field of photovoltaic monitoring, in particular to a panoramic monitoring system and method suitable for a photovoltaic station. The panoramic monitoring system configuration of the large-scale grid-connected photovoltaic power station in a scene mode of'high-voltage booster station-35kV pooling station-photovoltaic power generation area 'is studied, and reasonable configuration is carried out for layered arrangement of equipment of a safety and stability control layer, an emergency state monitoring layer, a field area network layer and a source control terminal layer and a communication method. A set of panoramic monitoring system configuration method combined with a relatively mature photovoltaic system architecture at present is provided, the communication control function of the panoramic monitoring system is perfected and optimized, and meanwhile, a set of standardized configuration method is provided for a panoramic monitoring system of a conventional photovoltaic power station.

Description

Technical Field

[0001] The present invention relates to the field of photovoltaic monitoring technology, and in particular to a panoramic monitoring system and method suitable for photovoltaic stations. Background Art

[0002] With the growing development of the new energy industry, the proportion of photovoltaic power generation has gradually increased. Compared with hydro turbines and steam turbines, photovoltaic power generation has the characteristics of large land area, many power generation units, and large control range. How to achieve lean control of the entire station in the event of a fault or disturbance in the power grid and realize the active support of photovoltaic stations to the power grid has become one of the urgent problems to be solved in today's photovoltaic industry.

[0003] Photovoltaic power stations use a single inverter as a power generation unit, and the number of devices that need to be sensed and controlled is much higher than that of wind power. Most of the panoramic monitoring systems of photovoltaic power stations currently being debugged set the safety and stability control layer and the emergency monitoring layer at the station control layer, and set source control terminals in the photovoltaic sub-arrays. Through the laid optical fiber network, the source control terminals communicate with the safety and stability control layer and the emergency monitoring layer. This solution has the problems of too long information transmission distance, inability to leanly control photovoltaic collection lines (35kV collection station array area incoming lines), heavy data processing burden of safety and stability control layer, and emergency monitoring layer equipment, and time delay. In the existing technology, no photovoltaic power station has officially put into operation a panoramic monitoring system, and the relevant standardized configuration methods are still blank. Summary of the invention

[0004] In view of the above problems, the present invention provides a panoramic monitoring system and method applicable to a photovoltaic station, which are used to simplify the structure of the panoramic monitoring system and reduce equipment delay.

[0005] In a first aspect, the present invention provides a panoramic monitoring system applicable to a photovoltaic station, comprising:

[0006] The dispatching end can control the resource monitoring master station, which is used to centrally monitor the photovoltaic stations;

[0007] The dispatch-end controllable resource monitoring master station is connected to several safety and stability control device hosts through the dispatch data network access device; the safety and stability control device host is set at the booster station to receive instructions issued by the dispatch-end controllable resource monitoring master station to realize the control of the photovoltaic system of the entire station;

[0008] The host of the safety and stability control device is connected to an emergency monitoring device and a slave of the safety and stability control device; the emergency monitoring device and the slave of the safety and stability control device are arranged at the collection station to receive instructions from the host of the safety and stability control device and to send instructions to the photovoltaic system and feeder in the corresponding collection area;

[0009] The emergency monitoring device and the safety and stability control device slave are connected to a number of photovoltaic sub-arrays; a source control terminal is arranged in each photovoltaic sub-array to receive instructions from the emergency monitoring device.

[0010] Furthermore, the source control terminal device of the photovoltaic sub-array is connected to a data collector, and the source control terminal device and the data collector use GOOSE communication;

[0011] The data collector is connected to the optical fiber distribution frame in the collection station through two cores of the optical fiber ring network laid in the photovoltaic sub-array;

[0012] The optical fiber distribution frame in the collection station is connected and communicated with the emergency monitoring device and the safety and stability control device slaves respectively through the ring network Ethernet switch.

[0013] Furthermore, the slave of the safety and stability control device is arranged in the secondary panel room of the collection station, collects the single-phase current of the photovoltaic incoming line and / or outgoing line cabinet, and receives the tripping instruction of the master of the safety and stability control device;

[0014] The slave of the safety and stability control device is connected to the optical fiber distribution frame in the booster station through two cores of the optical fiber laid between the booster stations;

[0015] The optical fiber distribution frame in the booster station is connected and communicated with the host of the safety and stability control device through a star Ethernet switch.

[0016] Furthermore, the emergency monitoring device is arranged in the secondary disk room of the collection station, collects the information of the source control terminal in the corresponding collection area, realizes the collection of the source control terminal information and the issuance of control commands;

[0017] The emergency monitoring device is connected to the optical fiber distribution frame in the booster station through two cores of the optical fiber laid between the booster stations;

[0018] The optical fiber distribution frame in the booster station is connected and communicated with the host of the safety and stability control device through a star Ethernet switch.

[0019] Furthermore, the emergency monitoring device is connected to the safety and stability control device slave via an Ethernet cable.

[0020] Furthermore, the host of the safety and stability control device is arranged in the secondary room of the booster station, receives information from the emergency monitoring device and the slave of the safety and stability control device, and realizes information transmission between the power generation unit on the station side and the power grid.

[0021] In a second aspect, the present invention provides a panoramic monitoring method applicable to a photovoltaic station, using the above-mentioned monitoring system;

[0022] The host of the safety and stability control device communicates with the controllable resource monitoring master station at the dispatch end;

[0023] The safety and stability control device master communicates with the safety and stability control device slaves and emergency monitoring devices in the collection station;

[0024] The emergency monitoring device communicates with the source control terminal of the photovoltaic sub-array.

[0025] The present invention has at least the following beneficial effects:

[0026] The present invention studies the configuration of the panoramic monitoring system of a large-scale grid-connected photovoltaic power station under the scenario mode of "high-voltage booster station-35kV collection station-photovoltaic power generation area", rationalizes the layered layout and communication method of the safety and stability control layer, emergency monitoring layer, field network layer and source control terminal layer equipment, and proposes a panoramic monitoring system configuration method combined with the relatively mature photovoltaic system architecture. The present invention improves and optimizes the communication control function of the panoramic monitoring system, and at the same time proposes a standardized configuration method for the panoramic monitoring system of a conventional photovoltaic power station.

[0027] 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

[0028] 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.

[0029] Figure 1 This is a schematic diagram of the monitoring system architecture of the present invention;

[0030] Figure 2 It is a communication diagram of the monitoring system of the present invention. DETAILED DESCRIPTION

[0031] 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.

[0032] In the prior art, most of the panoramic monitoring systems of photovoltaic power stations that are being debugged set the safety and stability control layer and the emergency monitoring layer at the station control layer, and set the source control terminal in the photovoltaic sub-array. Through the laid optical fiber network, the source control terminal can communicate with the safety and stability control layer and the emergency monitoring layer. This solution has the problems of too long information transmission distance, inability to leanly control the photovoltaic collection line (35kV collection station array area incoming line), safety and stability control layer, and emergency monitoring layer equipment. The single machine data processing burden is heavy and there is time delay. The present invention is intended to simplify the structure of the panoramic monitoring system, reduce equipment delay, and realize lean control for photovoltaic incoming lines (35kV collection station array area outgoing lines), photovoltaic collection lines (35kV collection station array area incoming lines), and single inverters. At the same time, the solution is universal and standardized, and can be widely used in grid-connected photovoltaic power stations under different working conditions, thereby greatly enhancing the active support role of photovoltaic stations to the power grid.

[0033] like Figure 1 As shown, the present invention provides a panoramic monitoring system suitable for a photovoltaic station, comprising:

[0034] The dispatching end can control the resource monitoring master station, which is used to centrally monitor the photovoltaic stations;

[0035] The dispatch-end controllable resource monitoring master station is connected to several safety and stability control device hosts through the dispatch data network access device; the safety and stability control device host is set at the booster station to receive instructions issued by the dispatch-end controllable resource monitoring master station to realize the control of the photovoltaic system of the entire station;

[0036] The host of the safety and stability control device is connected to the emergency monitoring device and the slave of the safety and stability control device; the emergency monitoring device and the slave of the safety and stability control device are arranged at the 35kV collection station to receive the instructions of the host of the safety and stability control device and to send the instructions to the photovoltaic system and the 35kV feeder in the corresponding collection area;

[0037] The emergency monitoring device and the safety and stability control device slave are connected to a number of photovoltaic sub-arrays; a source control terminal is arranged in each photovoltaic sub-array to receive instructions from the emergency monitoring device.

[0038] In specific implementation, it is applicable to a single 35kV collection station, and can also be applicable to multiple 35kV collection stations; it can also be applicable to high-voltage booster stations, including: 110kV booster stations, 220kV booster stations, 330kV booster stations, etc.

[0039] In one embodiment, if Figure 2 As shown, the source control terminal device of the photovoltaic sub-array is connected to a data collector, and the source control terminal device and the data collector use GOOSE communication;

[0040] The data collector is connected to the optical fiber distribution frame in the 35kV collection station through two cores of the optical fiber ring network laid in the photovoltaic sub-array;

[0041] The optical fiber distribution frame in the 35kV collection station is connected and communicated with the emergency monitoring device and the safety and stability control device slaves respectively through the ring network Ethernet switch.

[0042] In one embodiment, if Figure 2 As shown, the slave of the safety and stability control device is set in the secondary panel room of the 35kV collection station, collects the single-phase current of the photovoltaic incoming line and / or outgoing line cabinet, and receives the tripping command of the host of the safety and stability control device;

[0043] The slave of the safety and stability control device is connected to the optical fiber distribution frame in the booster station through two cores of the optical fiber laid between the booster stations;

[0044] The optical fiber distribution frame in the booster station is connected and communicated with the host of the safety and stability control device through a star Ethernet switch.

[0045] In one embodiment, if Figure 2 As shown, the emergency monitoring device is set in the secondary panel room of the 35kV collection station to collect information from the source control terminals in the corresponding collection area, so as to realize the collection of source control terminal information and the issuance of control commands;

[0046] The emergency monitoring device is connected to the optical fiber distribution frame in the booster station through two cores of the optical fiber laid between the booster stations;

[0047] The optical fiber distribution frame in the booster station is connected and communicated with the host of the safety and stability control device through a star Ethernet switch.

[0048] In one embodiment, the emergency monitoring device is connected to the safety and stability control device slave via an Ethernet cable.

[0049] In one embodiment, the host of the safety and stability control device is arranged in the secondary room of the booster station, receives information from the emergency monitoring device and the safety and stability control device slave, and realizes information transmission between the power generation unit on the station side and the power grid.

[0050] The present invention provides a panoramic monitoring method applicable to a photovoltaic station, using the above-mentioned monitoring system;

[0051] The host of the safety and stability control device communicates with the controllable resource monitoring master station at the dispatch end;

[0052] The safety and stability control device master communicates with the safety and stability control device slaves and emergency monitoring devices in the 35kV collection station;

[0053] The emergency monitoring device communicates with the source control terminal of the photovoltaic sub-array.

[0054] 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:

[0055] The overall architecture of the panoramic monitoring system of this method is divided into three layers. The first layer is to set up two sets of safety and stability control device hosts at the booster station, receive the instructions issued by the controllable resource monitoring master station at the dispatching end, communicate with the lower-end equipment, and complete the control of the photovoltaic system of the entire station; the second layer is to set up a set of emergency monitoring devices and a set of safety and stability control device slaves at each 35kV collection station, receive the instructions of the safety and stability control device host, and complete the issuance of instructions for the photovoltaic system (including inverters and energy storage equipment, etc.) and 35kV feeders (including 35kV collection station inlet and outlet lines) in the corresponding collection area; the third layer is to set up a source control terminal in each photovoltaic sub-array, receive and collect instructions from the emergency monitoring device in the area, and realize lean control of each inverter in the sub-array.

[0056] The sub-array area source control terminal equipment and the sub-array data collector use GOOSE communication. In order to save investment, information is uploaded through two cores of the optical fiber ring network laid in the sub-array to the optical fiber distribution frame in the 35kV aggregation station, and the optical fiber ring network is no longer laid separately; the safety and stability control device slave is installed in the secondary panel room of the 35kV aggregation station to collect the single-phase current of the photovoltaic incoming / outgoing line cabinet and receive the tripping command of the host of the safety and stability control device. In order to save investment, information is uploaded through two cores of the optical fiber laid between the booster station and the booster station to communicate with the host of the safety and stability control device, and the optical fiber is no longer laid separately; emergency monitoring The device is installed in the secondary panel room of the 35kV collection station. The device is equipped with a dedicated switch to collect information from the source control terminals in the corresponding collection area, so as to realize the aggregation of source control terminal information and the issuance of control commands. In order to save investment, the information is uploaded to the booster station through two cores of the optical fiber laid between the booster station to communicate with the main unit of the safety and stability control device, and the optical fiber is no longer laid separately; the main unit of the safety and stability control device is installed in the secondary room of the booster station, and the device is equipped with a dedicated switch to receive information from the emergency monitoring device and the safety and stability control device slave machine, so as to realize the information transmission between the power generation unit on the station side and the power grid.

[0057] 1. Overall system architecture

[0058] The overall architecture of the panoramic monitoring system of this method is divided into three layers. The first layer is to set up two sets of safety and stability control device hosts at the booster station; the second layer is to set up one set of emergency monitoring device and one set of safety and stability control device slaves at each 35kV collection station; the third layer is to set up a source control terminal device in each photovoltaic sub-array to achieve lean control of the entire station.

[0059] 2. Communication method

[0060] The source control terminals are connected by a 2-core optical fiber ring network to send information to the 35kV collection station; the safety and stability control device slaves and emergency monitoring devices in each regional 35kV collection station are uploaded to the booster station using a 4-core optical cable; the main host of the safety and stability control device is connected to the dispatching data network access equipment using a network cable.

[0061] Control scope

[0062] The control scope of the panoramic monitoring system includes: inverters, energy storage equipment, 35kV collection station incoming lines, 35kV collection station outgoing lines, etc.

[0063] 1. By distributing the emergency monitoring devices in various 35kV collection stations, the data processing volume of each machine is reduced. Each area communicates with the main host of the safety and stability control device separately, simplifying the overall structure, greatly reducing the system response time, and improving the response speed.

[0064] 2. By installing the emergency monitoring device and the safety and stability control device from the machine in the secondary panel room of the 35kV collection station, the panel cabinet can be assembled in the factory and then the whole machine can be delivered to the site, saving on-site construction time.

[0065] 3. By installing the safety and stability control device slave in each 35kV collection station, the purpose of controlling each 35kV collection station outgoing line and 35kV collection station incoming line can be achieved. Compared with the traditional method of only controlling the 35kV collection station outgoing line, the lean degree is greatly improved.

[0066] The specific implementation method of the panoramic monitoring system configuration method applicable to photovoltaic stations is as follows:

[0067] (1) The host of the safety and stability control device directly receives the instructions issued by the controllable resource monitoring master station at the dispatching end.

[0068] (2) The main safety and stability control device communicates with the slave safety and stability control device and the emergency monitoring device in the 35kV collection station to issue instructions.

[0069] (3) The safety and stability control device in the 35kV collection station receives instructions from the machine and the emergency monitoring device. The safety and stability control device accurately cuts off the 35kV feeder (including the 35kV collection station incoming line and the 35kV collection station outgoing line), and the emergency monitoring device sends instructions to the source control terminal equipment in the collection area.

[0070] (4) The source control terminal receives instructions and performs lean control of the energy storage, inverter and other equipment within the sub-array.

[0071] 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. A panoramic monitoring system suitable for photovoltaic stations, It is characterized in that include: The dispatching end can control the resource monitoring master station, which is used to centrally monitor the photovoltaic stations; The dispatch-end controllable resource monitoring master station is connected to several safety and stability control device hosts through the dispatch data network access device; the safety and stability control device host is set at the booster station to receive instructions issued by the dispatch-end controllable resource monitoring master station to realize the control of the photovoltaic system of the entire station; The safety and stability control device master is connected to an emergency monitoring device and a safety and stability control device slave; The emergency monitoring device and the safety and stability control device slaves are set up at the collection station to receive instructions from the safety and stability control device master and implement the issuance of instructions to the photovoltaic system and feeder in the corresponding collection area; The emergency monitoring device and the safety and stability control device slave are connected to a number of photovoltaic sub-arrays; a source control terminal is arranged in each photovoltaic sub-array to receive instructions from the emergency monitoring device.

2. According to claim 1, the panoramic monitoring system suitable for photovoltaic stations, It is characterized in that The source control terminal device of the photovoltaic sub-array is connected to the data collector, and the source control terminal device and the data collector use GOOSE communication; The data collector is connected to the optical fiber distribution frame in the collection station through two cores of the optical fiber ring network laid in the photovoltaic sub-array; The optical fiber distribution frame in the collection station is connected and communicated with the emergency monitoring device and the safety and stability control device slaves respectively through the ring network Ethernet switch.

3. According to claim 1, the panoramic monitoring system suitable for photovoltaic stations, It is characterized in that The slave of the safety and stability control device is installed in the secondary panel room of the collection station, collects the single-phase current of the photovoltaic incoming line and / or outgoing line cabinet, and receives the tripping command of the host of the safety and stability control device; The slave of the safety and stability control device is connected to the optical fiber distribution frame in the booster station through two cores of the optical fiber laid between the booster stations; The optical fiber distribution frame in the booster station is connected and communicated with the host of the safety and stability control device through a star Ethernet switch.

4. The panoramic monitoring system applicable to a photovoltaic station according to claim 1, It is characterized in that The emergency monitoring device is installed in the secondary disk room of the collection station to collect information from the source control terminals in the corresponding collection area, so as to realize the collection of source control terminal information and the issuance of control commands; The emergency monitoring device is connected to the optical fiber distribution frame in the booster station through two cores of the optical fiber laid between the booster stations; The optical fiber distribution frame in the booster station is connected and communicated with the host of the safety and stability control device through a star Ethernet switch.

5. The panoramic monitoring system applicable to a photovoltaic station according to claim 1, It is characterized in that The emergency monitoring device is connected to the safety and stability control device slave via an Ethernet cable.

6. The panoramic monitoring system applicable to a photovoltaic station according to claim 1, It is characterized in that The main unit of the safety and stability control device is installed in the secondary room of the booster station, receives information from the emergency monitoring device and the slave unit of the safety and stability control device, and realizes information transmission between the power generation unit on the station side and the power grid.

7. A panoramic monitoring method suitable for photovoltaic stations, It is characterized in that A monitoring system according to any one of claims 1 to 6; The host of the safety and stability control device communicates with the controllable resource monitoring master station at the dispatch end; The safety and stability control device master communicates with the safety and stability control device slaves and emergency monitoring devices in the collection station; The emergency monitoring device communicates with the source control terminal of the photovoltaic sub-array.

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