CN109600116B - Movable photovoltaic grid-connected detection system - Google Patents
Movable photovoltaic grid-connected detection system Download PDFInfo
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Abstract
The application relates to a portable photovoltaic detection system that is incorporated into power networks includes: the mobile device comprises a mobile device and a detection device arranged on the mobile device, wherein the detection device is also used for remotely connecting a control system; the detection device is provided with a power grid simulator, an oscilloscope, an island generation device, an electric energy quality monitor and a power tester; the power grid simulator is connected with a power grid and the photovoltaic power generation system to be tested; the island generating device is connected with a second test circuit, and the electric energy quality monitor is connected with the first test circuit and/or the second test circuit; the power tester is connected with at least one of the first test circuit and the second test circuit. The photovoltaic power generation system to be detected can be movably detected, the control system is remotely connected with the detection device, the detection content can be centralized on the operation of a workstation, the automatic operation is realized, the detection test process becomes convenient, safe and reliable, the on-site problem can be timely interrupted or diagnosed and recovered by detection personnel when the data are abnormal, and the normal operation and the personal safety of the detection are ensured.
Description
Technical Field
The application relates to the technical field of new energy power generation grid-connected detection, in particular to a mobile photovoltaic grid-connected detection system.
Background
Due to the rise of the photovoltaic power generation industry, the photovoltaic power generation technology is rapidly developed in the world at present, and a large number of grid-connected operation photovoltaic power stations are built. In order to ensure that grid-connected access of the photovoltaic power station does not have great influence on a power grid and operation state change of the power grid does not influence equipment safety of the photovoltaic power station, standards for grid-connected access of the photovoltaic power station and grid-connected detection standards are set by various countries, and only through grid-connected detection of relevant mechanisms, grid-connected qualification is obtained, and the photovoltaic power station can be accessed to the power grid to operate. The photovoltaic power station mobile detection platform provides an important means for analyzing the influence of various types of photovoltaic power station grid connection on a power grid for users and objectively evaluating the grid connection characteristics of the photovoltaic power stations. The photovoltaic grid-connected detection system is a safe and reliable basic condition of the detection platform.
The mobile photovoltaic grid-connected detection platform has the testing capabilities of testing the power quality of a photovoltaic power station, testing the active/reactive power control capability, testing the power grid adaptability, testing the low voltage ride through capability, testing the anti-islanding protection characteristic, testing the over-current protection of an inverter, testing the interoperability of an alternating current charging pile through reverse power protection, and the like.
At present, the automation degree of a photovoltaic grid-connected detection system is not high. The control is relatively rigid, the operation is complex, and the operation error is easy to occur. However, a complete set of mobile photovoltaic grid-connected detection system is needed, the whole set of functions are centralized, all operation logics are interlocked, tedious operations are reduced, the error rate is reduced to the minimum by centralized control, and the efficiency is improved.
The automation degree of the existing photovoltaic grid-connected detection trolley needs to be improved, the detection items are more and cannot be controlled in a centralized manner, single detection content needs to be manually controlled in the detection process, and inaccuracy and even accidents can be caused if other items are detected simultaneously or the test items conflict.
Disclosure of Invention
Based on this, it is necessary to provide a mobile photovoltaic grid-connected detection system.
A mobile photovoltaic grid-connected detection system comprises: the device comprises a mobile device and a detection device arranged on the mobile device, wherein the detection device is also used for remotely connecting a control system; the detection device is provided with a power grid simulator, an oscilloscope, an island generation device, an electric energy quality monitor and a power tester; one end of the power grid simulator is used for being connected with a power grid through a first test circuit, and the other end of the power grid simulator is used for being connected with a photovoltaic power generation system to be tested through a second test circuit; the islanding generation device is connected with the second test line, and the power quality monitor is connected with at least one of the first test line and the second test line; the power tester is connected with at least one of the first test line and the second test line.
The movable photovoltaic grid-connected detection system can movably detect a photovoltaic power generation system to be detected, the control system is remotely connected with the detection device, the detection content can be centralized on the operation of the workstation, the automatic operation is realized, the detection test process becomes convenient, safe and reliable, the on-site problem can be timely interrupted or diagnosed and recovered by detection personnel when the data is abnormal, and the normal operation and the personal safety of the detection are ensured.
In one embodiment, the detection device is provided with two power quality monitors, wherein a first power quality monitor is connected with the first test line, and a second power quality monitor is connected with the second test line.
In one embodiment, the detection device is provided with two power testers, wherein a connection point of the islanding generation device and the second test line is located between a connection point of the first power tester and the second test line and a connection point of the second power tester and the second test line.
In one embodiment, the detection device is provided with two power quality monitors and two power testers;
one end of the power grid simulator is connected with a first test circuit through a first circuit breaker and is used for being connected with a power grid through the first test circuit;
the other end of the power grid simulator is connected with a second test circuit through a second circuit breaker, and the second test circuit is connected with an external switch and is used for being connected with a photovoltaic power generation system to be tested through the external switch;
one end of the third circuit breaker is connected with the first test circuit, and the other end of the third circuit breaker is connected with the second test circuit;
the island generating device is connected with the second test circuit through a fourth circuit breaker;
in the two power quality monitors, the first power quality monitor is connected with the first test circuit, the second power quality monitor is connected with the second test circuit, and the connection point of the second power quality monitor is positioned between the connection point of the fourth circuit breaker and the second test circuit and the second circuit breaker;
in the two power testers, the first power tester is connected with the second test circuit, and the connection point of the first power tester is positioned between the connection point of the fourth circuit breaker and the second test circuit and the second circuit breaker;
the oscilloscope is respectively connected with the third circuit breaker and the second test circuit, and the oscilloscope is also used for connecting the photovoltaic power generation system to be tested.
In one embodiment, the connection point of the third circuit breaker to the second test line is located between the connection point of the second power quality monitor to the second test line and the second circuit breaker; the connection point of the third circuit breaker and the first test line is positioned between the connection point of the first power quality monitor and the first test line and the first circuit breaker; and the connection point of the oscilloscope and the second test line is positioned between the connection point of the first power tester and the second test line and the connection point of the fourth circuit breaker and the second test line.
In one embodiment, the mobile photovoltaic grid-connected detection system further comprises a controller, the controller is connected with the detection device and is remotely connected with the control system, and the detection device is used for being remotely connected with the control system through the controller; the controller is used for receiving a command of the control system, namely a control command, and controlling the detection device to detect according to the command.
In one embodiment, the detection device further includes a controller, the controller is respectively connected to the grid simulator, the oscilloscope, the islanding generation device, the power quality monitor, and the power tester, and the controller is further configured to remotely connect to the control system.
In one embodiment, the mobile photovoltaic grid-connected detection system further comprises a control system, an Ethernet switch and a communication manager; the Ethernet switch and the communication manager are both arranged on the mobile equipment; the detection device is directly connected with one of the Ethernet switch and the communication manager, and the communication manager is connected with the Ethernet switch so that the detection device is directly or indirectly connected with the Ethernet switch and the communication manager; the control system is remotely connected with the Ethernet switch and is connected with the detection device through the Ethernet switch.
In one embodiment, the control system is connected to the detection device through the ethernet switch, and includes: the control system is directly connected with the detection device through the Ethernet switch, or the control system is sequentially connected with the detection device through the Ethernet switch and the communication manager.
In one embodiment, the mobile photovoltaic grid-connected detection system further comprises an instruction validity checking module, the instruction validity checking module is arranged on the mobile device and connected with the ethernet switch, and the control system is connected with the detection device through the ethernet switch and the instruction validity checking module; the instruction validity checking module is used for detecting the validity of the instruction issued by the control system, issuing the detection device when the instruction is valid and feeding back the control system when the instruction is invalid.
In one embodiment, the mobile device is a mobile cart.
Drawings
Fig. 1 is a schematic structural diagram of a detection apparatus according to an embodiment of the present application.
Fig. 2 is a system connection diagram according to another embodiment of the present application.
FIG. 3 is a schematic diagram of a test transition of another embodiment of the present application.
Fig. 4 is a schematic diagram of a basic detection flow according to another embodiment of the present application.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, embodiments accompanying the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. This application is capable of embodiments in many different forms than those described herein and that modifications may be made by one skilled in the art without departing from the spirit and scope of the application and it is therefore not intended to be limited to the specific embodiments disclosed below.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
An embodiment of the present application is, a portable photovoltaic grid-connected detection system, it includes: the device comprises a mobile device and a detection device arranged on the mobile device, wherein the detection device is also used for remotely connecting a control system; the detection device is provided with a power grid simulator, an oscilloscope, an island generation device, an electric energy quality monitor and a power tester; one end of the power grid simulator is used for being connected with a power grid through a first test circuit, and the other end of the power grid simulator is used for being connected with a photovoltaic power generation system to be tested through a second test circuit; the islanding generation device is connected with the second test line, and the power quality monitor is connected with at least one of the first test line and the second test line; the power tester is connected with at least one of the first test line and the second test line. The movable photovoltaic grid-connected detection system can movably detect a photovoltaic power generation system to be detected, the control system is remotely connected with the detection device, the detection content can be centralized on the operation of the workstation, the automatic operation is realized, the detection test process becomes convenient, safe and reliable, the on-site problem can be timely interrupted or diagnosed and recovered by detection personnel when the data is abnormal, and the normal operation and the personal safety of the detection are ensured.
In the traditional method, a detection trolley is often connected with a photovoltaic power generation system to be detected, various detection devices are connected to the detection trolley on site, and detection is carried out on the site, so that potential safety hazards exist on one hand, and centralized management is not facilitated on the other hand. All test items are constrained by a dual condition of logical interlocking and remote in-situ on-site. The detection trolley system is more rigorous and convenient. All operations can be visualized in the workstation. The problem reasons can be located quickly, faults and problems can be processed quickly, the experiment can be recovered in the shortest time, and normal working operation of equipment, experiments and personnel is guaranteed. In one embodiment, the mobile photovoltaic grid-connected detection system further comprises the control system, and in one embodiment, the control system is a monitoring system of a computer workstation; in one embodiment, the control system is used for selecting a detection state and issuing an instruction through communication, the detection device or the instruction validity checking module detects the validity of the instruction, the detection device is issued when the instruction is valid, and the control system is fed back when the instruction is invalid. Further, the command includes a control command and/or a setting parameter. In one embodiment, the mobile photovoltaic grid-connected detection system selects the detection state by adopting a monitoring system of a computer workstation, issues a control command and sets parameters through communication, a software system judges whether the detection state is effective or not through the issued command, and the software system issues the detection state to corresponding detection equipment for detection in a normal range. Otherwise, the instruction issuing is prompted to be invalid. The detected data can be uploaded back to the monitoring system of the workstation in a data interaction mode.
In one embodiment, the power grid is a low voltage distribution grid; in one embodiment, the low-voltage distribution network is a 380V low-voltage distribution network; in one embodiment, the low-voltage distribution network is a three-phase 380V network. In one embodiment, one end of the power grid simulator is used for being connected with a 380V low-voltage power distribution network through a first test line, and the other end of the power grid simulator is used for being connected with a photovoltaic power generation system to be tested through a second test line. In practical application, the voltage of the power grid can be controlled or adjusted according to specific conditions and requirements. In one embodiment, the oscilloscope is used for acquiring the waveform of the connecting line; in one embodiment, the power tester is used for performing power analysis, namely power characteristic test on the connecting line; in one embodiment, the power quality monitor is used for performing power quality analysis (power quality test) on the connection line; in one embodiment, the grid simulator is used for outputting a simulated grid signal and performing a grid adaptability test and/or a low voltage ride through capability test. In one embodiment, the power grid simulator is adopted to simulate various power grid working conditions, and various disturbance environments such as voltage fluctuation, frequency disturbance, voltage temporary rise/fall, harmonic disturbance, three-phase imbalance and the like are provided for the performance test of the photovoltaic power generation system to be tested, particularly the photovoltaic inverter of the photovoltaic power generation system to be tested. The power grid simulator has bidirectional reversible four-quadrant operation capacity; the inverter has the functions of adjustable voltage, adjustable frequency, controllable harmonic wave, low voltage ride through simulation and the like, and can meet various testing requirements on the inverter. In one embodiment, the islanding generation device is used for carrying out an anti-islanding protection characteristic test. The islanding effect is a phenomenon that power generation equipment still serves as an isolated power supply to supply power to a load under the condition that a power grid suddenly loses voltage, and the islanding effect has great hidden dangers on the safety of the equipment and personnel, for example, when a maintainer stops power supply of the power grid and overhauls a power line and power equipment, if an inverter of a grid-connected solar power station still continues to supply power, casualty accidents of the maintainer can be caused. The islanding generating device is also called as an islanding preventing detection device, is usually applied to the identification detection of an islanding preventing function of a photovoltaic grid-connected inverter, and is also applied to the islanding preventing test and the identification detection of a grid-connected power supply, and it is required to be explained that an oscilloscope, a power tester, an electric energy quality monitor, a power grid simulator, an islanding generating device and the like in the embodiments of the application, including a control device and the like which are described later, can be purchased from the market, and is not the invention point of the application, the embodiments of the application mainly adopt the devices, skillfully combine and connect the devices, and apply the devices to mobile equipment to realize the movement detection function of a photovoltaic power generation system to be detected, and can automatically control and remotely control in the movement detection to realize automatic operation, so that the detection test process becomes convenient, safe and reliable, and the detection personnel can timely interrupt or diagnose and recover the field problem when the data is abnormal, thereby ensuring the normal operation of detection and personal safety.
In one embodiment, the detection device is provided with two power quality monitors, wherein a first power quality monitor is connected with the first test line, and a second power quality monitor is connected with the second test line. In one embodiment, the detection device is provided with two power testers, wherein a connection point of the islanding generation device and the second test line is located between a connection point of the first power tester and the second test line and a connection point of the second power tester and the second test line. It is understood that the connection point of the islanding generating device to the second test line, i.e. the connection point where the islanding generating device is connected to the second test line, is an access point, and so on for the remaining embodiments. The two power quality monitors and/or the two power testers can be used for detecting the power quality and/or the power at two positions, particularly at two different positions, the design is mainly set for matching with a power grid simulator and an island generating device, the two power quality monitors are respectively connected to two sides of the power grid simulator, and different conditions of the power grid simulator under the starting state or the non-use state can be monitored; the two power testers are respectively connected to two sides of a connection point of the island generating device and can be matched with the island generating device to realize accurate power test.
In one embodiment, the detection device is provided with two power quality monitors and two power testers; one end of the power grid simulator is connected with a first test circuit through a first circuit breaker and is used for being connected with a power grid through the first test circuit; the other end of the power grid simulator is connected with a second test circuit through a second circuit breaker, and the second test circuit is connected with an external switch and is used for being connected with a photovoltaic power generation system to be tested through the external switch; one end of the third circuit breaker is connected with the first test circuit, and the other end of the third circuit breaker is connected with the second test circuit; the island generating device is connected with the second test circuit through a fourth circuit breaker; in the two power quality monitors, the first power quality monitor is connected with the first test circuit, the second power quality monitor is connected with the second test circuit, and the connection point of the second power quality monitor is positioned between the connection point of the fourth circuit breaker and the second test circuit and the second circuit breaker; in the two power testers, the first power tester is connected with the second test circuit, and the connection point of the first power tester is positioned between the connection point of the fourth circuit breaker and the second test circuit and the second circuit breaker; and the oscilloscope is respectively connected with the third circuit breaker, the second test circuit and the external switch. In one embodiment, the connection point of a third circuit breaker to the second test line is located between the connection point of the second power quality monitor to the second test line and the second circuit breaker; the connection point of the third circuit breaker and the first test line is positioned between the connection point of the first power quality monitor and the first test line and the first circuit breaker; and the connection point of the oscilloscope and the second test line is positioned between the connection point of the first power tester and the second test line and the connection point of the fourth circuit breaker and the second test line. As shown in fig. 1, in one embodiment, the detecting device is provided with a grid simulator, an oscilloscope, an islanding generating device, two power quality monitors and two power testers; one end of the power grid simulator is connected with a first test line through a first circuit breaker CB1 and is used for being connected with a 380V low-voltage power distribution network through the first test line; the other end of the power grid simulator is connected with a second test circuit through a second circuit breaker CB2, and the second test circuit is connected with an external switch S1 and is used for being connected with a photovoltaic power generation system to be tested through the external switch; one end of a third circuit breaker CB3 is connected with the first test circuit, and the other end of the third circuit breaker CB3 is connected with the second test circuit; the island generating device is connected with the second test line through a fourth circuit breaker CB 4; in the two power quality monitors, the first power quality monitor is connected with the first test line, the second power quality monitor is connected with the second test line, and the connection point of the second power quality monitor is positioned between the connection point of the fourth circuit breaker CB4 and the second test line and the second circuit breaker CB 2; in the two power testers, the first power tester is connected with the second test line, and the connection point of the first power tester is positioned between the connection point of the fourth circuit breaker CB4 and the second test line and the second circuit breaker CB2, and the second power tester is connected with the second test line, and the connection point of the second power tester is positioned between the connection point of the fourth circuit breaker CB4 and the second test line and the external switch S1; the oscilloscope is connected with the third circuit breaker CB3 and the second test circuit respectively, and the oscilloscope is also used for connecting the photovoltaic power generation system to be tested. The connection point of the third circuit breaker CB3 and the second test line is positioned between the connection point of the second power quality monitor and the second test line and the second circuit breaker CB 2; the connection point of the third circuit breaker CB3 and the first test line is positioned between the connection point of the first power quality monitor and the first test line and the first circuit breaker CB 1; and the connection point of the oscilloscope and the second test line is positioned between the connection point of the first power tester and the second test line and the connection point of the fourth circuit breaker CB4 and the second test line. Due to the design, when the power grid simulator is required to be used for detection, the power grid simulator is connected in, and the power grid simulator is disconnected after detection, and the third circuit breaker CB3 can be connected after the power grid simulator is disconnected for further testing; on one hand, the photovoltaic power generation system to be detected is directly used after detection without dismantling the photovoltaic power generation system to be detected, on the other hand, the power grid is disconnected at any time and automatic detection is carried out again in the operation stage after the photovoltaic power generation system to be detected is connected, and the application is very convenient.
In one embodiment, the mobile photovoltaic grid-connected detection system further comprises a controller, the controller is connected with the detection device and is remotely connected with the control system, and the detection device is used for being remotely connected with the control system through the controller; the controller is used for receiving a command of the control system, namely a control command, and controlling the detection device to detect according to the command. Or, in one embodiment, the detection device further includes a controller, the controller is respectively connected to the grid simulator, the oscilloscope, the islanding generation device, the power quality monitor, and the power tester, and the controller is further configured to remotely connect to the control system. Further, in one embodiment, the controller is connected to the power grid simulator, the oscilloscope, the island generator, the power quality monitor, and the power tester, respectively, and configured to receive a control command, which is an instruction of the control system, and control the power grid simulator, the oscilloscope, the island generator, the power quality monitor, and the power tester to perform detection according to the command. Further, in one embodiment, the controller is connected to the first circuit breaker, the second circuit breaker, the third circuit breaker, the fourth circuit breaker, and the external switch, and the controller is configured to control the first circuit breaker, the fourth circuit breaker, and the external switch, respectively, so as to implement various detection controls on the detection device, including controlling the grid simulator, the oscilloscope, the island generation device, the power quality monitor, the power tester, and the like. In one embodiment, the controller controls the grid simulator, the oscilloscope, the islanding generation device, the two power quality monitors, the two power testers, and the like respectively. In one embodiment, the controller is provided with an instruction validity checking module, the instruction validity checking module is used for detecting the validity of an instruction issued by the control system, when the instruction is valid, the controller executes the instruction to control the detection device to detect according to the instruction, and when the instruction is invalid, the controller feeds back the control system. In one embodiment, the control system is configured to receive an instruction input by an external user or generate an instruction according to a detection scheme, and send the instruction to the controller. Further, in one embodiment, the instructions are a set of instructions, or the instructions are used to form a test scenario. Further, the mobile photovoltaic grid-connected detection system further comprises a signal transmission device, the signal transmission device is connected with the controller, the signal transmission device is used for receiving a control signal and transmitting the control signal to the controller, and the controller is further used for respectively controlling the power grid simulator, the oscilloscope, the power tester, the electric energy quality monitor and the island generation device according to the control signal. In one embodiment, the controller controls the power grid simulator, the oscilloscope, the power tester, the power quality monitor and the island generator to output or test respectively according to the control signal. In one embodiment, the control signal includes a test scheme, and the controller is configured to control the power grid simulator, the oscilloscope, the power tester, the power quality monitor, and the islanding generation device to output or test according to the test scheme in the control signal. In one embodiment, the test scheme is set or adjusted according to the photovoltaic power generation system under test. In one embodiment, the signal transmission device is a wireless transmission device, and is configured to receive the control signal through wireless transmission. In one embodiment, the controller is an industrial personal computer such as a centralized control industrial personal computer. In one embodiment, the signal transmission device is an ethernet switch and/or a communication manager. Furthermore, the data acquisition function of the photovoltaic power generation system to be detected and the photovoltaic inverter thereof in the mobile photovoltaic grid-connected detection system is realized by relying on a power tester, an oscilloscope and an electric energy quality monitor, and the high-precision acquisition and analysis of voltage, current and circuit breaker signals can be realized. The power quality monitor collects and analyzes the power quality of the grid-connected point. The device uploads data to a centralized control industrial personal computer through an RS 485/Ethernet interface, and automatic test and data automatic analysis functions of detection items are achieved. In one embodiment, the mobile photovoltaic grid-connected detection system further comprises a control system, an Ethernet switch and a communication manager; the Ethernet switch and the communication manager are both arranged on the mobile equipment; the detection device is directly connected with one of the Ethernet switch and the communication manager, and the communication manager is connected with the Ethernet switch so that the detection device is directly or indirectly connected with the Ethernet switch and the communication manager; the control system is remotely connected with the Ethernet switch and is connected with the detection device through the Ethernet switch. In one embodiment, the control system is connected to the detection device through the ethernet switch, and includes: the control system is directly connected with the detection device through the Ethernet switch, or the control system is sequentially connected with the detection device through the Ethernet switch and the communication manager. Further, in one embodiment, the mobile photovoltaic grid-connected detection system further includes a controller, a control system, an ethernet switch and a communication manager, where the ethernet switch and the communication manager are both disposed on the mobile device; the controller is connected with the detection device, the Ethernet switch and the communication management machine, the controller is remotely connected with the control system, the detection device is directly connected with the controller and is connected with the Ethernet switch and the communication management machine through the controller, the controller is remotely connected with the control system through the Ethernet switch and/or the communication management machine, the controller is used for receiving an instruction of the control system, namely a control instruction, and the detection device is controlled to detect according to the instruction. In one embodiment, the mobile photovoltaic grid-connected detection system further comprises an output device, and the output device is connected with the control system; further, the control system is further configured to control the output device to generate and output detection results of the oscilloscope, the power tester, the power quality monitor and the island generation device, where the detection results are used to provide safety evaluation and performance evaluation of the photovoltaic power generation system to be tested; further, the control system is further configured to control the output device to generate and output a detection result of the oscilloscope, the power tester, the power quality monitor, and the island generation device for the photovoltaic power generation system to be detected, where the detection result is used to provide safety evaluation and performance evaluation of the photovoltaic power generation system to be detected. With such a design, the output of the detection result can be controlled by the control system.
In one embodiment, the mobile photovoltaic grid-connected detection system comprises a computer monitoring background, an Ethernet switch and a communication management machine. The background and the communication manager are connected to the switch through the Ethernet, the detection equipment is connected to the communication manager or the switch through the Ethernet or RS485, and the communication manager receives the RS485 communication protocol, completes conversion of the Ethernet communication protocol and transmits the converted Ethernet communication protocol to the background through the switch. In one embodiment, the control system is a computer monitoring background, which may also be referred to as a computer workstation, a computer background, or a background; or the control system is a monitoring system of a computer workstation. In one embodiment, a computer background directly controls all detection devices in the mobile platform, a monitoring system of the background selects detection items, issues control instructions and sets parameters through communication, a software system judges whether the issued instructions are effective through a logical relationship, and the instructions are issued to corresponding detection equipment in a normal range for detection. Otherwise, the instruction issuing is prompted to be invalid. The detected data can be uploaded back to the monitoring system of the workstation in a data interaction mode. In one embodiment, the control system is used for setting four states of an idle state, a standby state, a test state and a fault state. The shutdown state is used to indicate that the detection system is in a shutdown state. The standby state is a preparation work from the shutdown state to the test state. The test state is used to represent the entry test item. The fault state is used for indicating that an abnormal condition occurs in the detection system. The states can be converted when certain conditions are met. The opening and closing operation gear position adjusting operation of the switch may occur in each state.
Further, in one embodiment, the control system is further configured to connect the photovoltaic power generation system to be tested to a power grid or send an alarm signal according to the detection result, and in one embodiment, the control system is further configured to determine that the photovoltaic power generation system to be tested passes the detection according to the detection result, that is, when the photovoltaic power generation system to be tested passes the safety evaluation and the performance evaluation, that is, when the photovoltaic power generation system to be tested does not have a potential safety hazard, connect the photovoltaic power generation system to be tested to the power grid; the control system is also used for sending an alarm signal when the photovoltaic power generation system to be detected is determined not to pass the detection according to the detection result, namely the photovoltaic power generation system to be detected does not pass the safety evaluation and the performance evaluation, namely the potential safety hazard exists; in one embodiment, the control system sends an alarm sound or sends alarm information to a mobile terminal of an administrator or sends alarm information to a management server.
Aiming at the defects of the existing trolley software system technology, in one embodiment, the control system of the mobile photovoltaic grid-connected detection system is a monitoring system of a computer workstation, namely the computer workstation is provided with the monitoring system, a detection state is selected by the monitoring system and an instruction is issued in a communication mode, the instruction comprises a control instruction and a setting parameter, the controller or the detection device receives the issued instruction and judges whether the instruction is effective, and the instruction is issued to corresponding detection equipment such as a power grid simulator, an oscilloscope, an island generation device, an electric energy quality monitor and/or a power tester within a normal range to perform detection work; otherwise, the instruction issuing is prompted to be invalid. The detected data is uploaded back to the monitoring system of the computer workstation in the form of data interaction. Therefore, centralized control and remote control in the detection work of the movable trolley can be realized, and the movable grid-connected detection is safer, more convenient and more reliable.
Further, in one embodiment, the control system is used for setting detection content and parameters; further, in one embodiment, the content of the detection of the mobile photovoltaic grid-connected detection system or the controller or the control system includes: three kinds of grid-connected detection tests of low voltage ride through, island detection and power grid adaptability and setting of corresponding parameters. Further, in one embodiment, the test process state of the mobile grid-connected photovoltaic detection system or the controller or the control system includes: the system comprises a shutdown state, a standby state, a test state, a power grid adaptation state (also called as a power grid adaptation test state), a low voltage ride through test state, an island test state and a fault state. Further, in one embodiment, the mobile photovoltaic grid-connected detection system or the controller or the control system further includes control and/or setting of a control instruction. In one embodiment, the setting the detection content and the parameter includes:
1) power grid adaptability test state: three-phase voltage setting and frequency setting.
2) Island test state of the island generating device: r, L, C value setting.
3) Low voltage ride through test state: fall time setting, fall depth setting and fall mode setting.
In one embodiment, the command, i.e., the control command, includes a power-on command, a test command, a reset command, a stop command, and a circuit breaker switching-on/off command. It can be understood that the circuit breaker switching-on/off command includes a first circuit breaker switching-on/off command, a fourth circuit breaker switching-on/off command, an external switch switching-on/off command and the like.
In one embodiment, the network connection for communication is that the computer workstation accesses the switch through the ethernet, the circuit breaker, i.e. the switch, accesses the communication controller through RS485 communication in a terminal mode, and the communication controller accesses the switch through the ethernet. The detection means are accessed to the switch via the ethernet. Wherein, the communication controller completes the interconversion from the RS485 communication protocol to the Ethernet communication protocol. In one embodiment, each test is provided with an emergency stop control, a remote control and a local control, and correspondingly, the controller or the control system is provided with an emergency stop button, and the remote/local knob is uploaded to the background workstation along with the test equipment through the ethernet (IEC104, Modbus, IEC61850 and the like). In one embodiment, the circuit breakers are uploaded to a background through terminals, and in one embodiment, 4 terminals are arranged in fig. 2 corresponding to 4 circuit breakers in fig. 1, namely switches CB1 to CB4, and four states of the circuit breakers are collected through the terminals.
In one embodiment, a control system of the mobile photovoltaic grid-connected detection system is used for setting a background test process state; the background test process state comprises 4 states of a shutdown state, a standby state, a test state and a fault state, wherein the test state is divided into a power grid adaptability test state, a low voltage ride through test state and an island test state. Wherein the shutdown state is used for representing that the detection system is in a shutdown state. In the shutdown state, all the circuit breakers and contactors are in the open position, otherwise, the background executes the sub-operation. When the device is in a shutdown state, when a background receives a remote signal of any detection device and a background startup command, the device is switched to a standby state, and when the control operation fails and an emergency stop signal or a safety chain action signal is received, the device is switched to a fault state; wherein the standby state is used for indicating the preparation work before the detection start test is finished. In the standby state, any test detection device is driven far away, and the detection device is started up, the standby state is entered, namely, the test state can be entered by giving a test item instruction. And when the background receives the sudden stop of the background detection equipment, the local state of all the equipment or the shutdown of the equipment in the standby state, switching to the shutdown state. When the content of a remote detection item is selected, switching to a test state, and switching to a fault state when the control operation fails or a background receives an emergency stop signal or a background receives a safety chain action signal; the test states are used for indicating entering into a detection test, and three test states, namely a power grid adaptability test state, a low voltage ride through test state and an island test state, are available. In one embodiment, the fitness test state comprises: and selecting a power grid adaptation test in a background workstation, setting response parameters at a remote place by the testing device, wherein the response parameters comprise voltage response parameters and/or frequency response parameters, and then starting the testing device to obtain an adaptation test state. In one embodiment, the low voltage ride through test state comprises: selecting a low-voltage ride through test in the background, setting corresponding parameters including a falling time, a falling mode and/or a falling depth at a remote place of the test device, and then starting the test device to obtain a low-voltage ride through test state. In one embodiment, the islanding test state comprises: selecting an island test in the background, setting corresponding parameters comprising R, L, C and a corresponding circuit breaker by the remote testing device, and then starting the device to be an island test state. If one item is detected, the execution is refused when the other detected content is operated, for example, the inoperable phenomenon is fed back to realize the function interlocking. And all the operation parameter configuration and data can be completed and collected in the background, namely the control system. And in the test state, automatically entering the standby state after the test is finished, and if the test is carried out again, selecting the test state on the background, selecting the detection content and the preset parameters, and entering the test state again. And when any one of the situations of control operation failure, emergency stop signal received by the background, safety chain action signal received and background stop command received occurs, the fault state is switched to. And the fault state is used for indicating that the detection system has an abnormal condition. In a fault state, the background can default to open all the contactors. When the breaker is in a fault state, when all the breakers are in an off state, the 'emergency stop' button is not pressed down and the safety chain is not started, the breaker is switched to a stop state after a reset instruction is sent out at the background. By the design, the detection content of the mobile photovoltaic grid-connected detection system can be operated by focusing on the detection system arranged at the workstation, automation is realized, the detection test process is convenient, safe and reliable, and the detection content logic is designed aiming at the characteristics of the mobile photovoltaic grid-connected detection, so that the detection content has a logic interlocking relationship during operation, a plurality of detection items are simultaneously operated under the condition of no communication during detection, the detection result is meaningful, and the reliability of the test detection result is ensured. And the design and detection content are integrated, other equipment and in-station data are visually embodied during detection, and the situation that detection personnel can timely interrupt or diagnose and recover the site problem when the data are abnormal is ensured, so that the normal operation and personal safety of the detection are ensured.
In one embodiment, the mobile photovoltaic grid-connected detection system further comprises an instruction validity checking module, the instruction validity checking module is arranged on the mobile device and connected with the ethernet switch, and the control system is connected with the detection device through the ethernet switch and the instruction validity checking module; the instruction validity checking module is used for detecting the validity of the instruction issued by the control system, issuing the detection device when the instruction is valid and feeding back the control system when the instruction is invalid. Further, in one embodiment, the instruction validity checking module is disposed in the controller, and in one embodiment, the controller is integrally disposed with the instruction validity checking module.
In one embodiment, the mobile device is a mobile cart. The movable trolley is common equipment in the field, but the traditional movable trolley has single function and limited detection performance, and is not enough for protecting workers, the detection device is adopted in each embodiment, so that the safety performance of the movable trolley is greatly improved, a detection instruction can be sent out from a workstation, namely a control system, and a detection result can be displayed on the workstation, so that the detection content is concentrated on the operation of the workstation, the automatic operation is realized, the detection test process is convenient, safe and reliable, the detection personnel can timely interrupt or diagnose and recover the field problem when the data is abnormal, and the normal operation and personal safety of the detection are ensured.
In one embodiment, the electrical structure of the detection device is as shown in fig. 1, in the aspect of power quality monitoring, two power quality monitoring points are arranged, so that power quality observation required in detection can be completed, for a photovoltaic power generation system to be detected equipped with a power quality measurement device, comparison of the power quality measurement device installed in the photovoltaic power generation system to be detected can be realized, the correctness of the power quality measurement device can be checked, and the power quality measurement device carried by the photovoltaic power generation system to be detected can store data for one year for calling and checking. The power quality monitoring device also needs to have the function of measuring the direct current injection current. The power testing device comprises an alternating current network end, a photovoltaic power generation end and an RLC load end. The power testing device can set the measured values of voltage, current, active power, reactive power, power factor and the like through the background. The monitoring devices enter the switch through the Ethernet to interact with the background, and data are checked. The CB1 and the CB2 can cooperate with the CB3 to switch on or off the grid simulator. Island test state experiments can be conducted through the CB 4. In one embodiment, as shown in fig. 1, the oscilloscope obtains the breaking signal thereof through the CB3, obtains the current signal thereof through the second test line, and obtains the stop signal thereof through the photovoltaic power generation system to be tested.
In one embodiment, the communication and connection are as shown in fig. 2, and in one embodiment, the grid adaptability test is performed through a grid adaptability test state, which includes: and (3) testing operation voltage deviation, voltage fluctuation and flicker, three-phase voltage unbalance, frequency deviation, harmonic waves and inter-harmonic waves. And the background transmits voltage and frequency to the power grid simulator, and the power grid simulator regulates the output data and transmits the output data to the background to judge whether the output data is qualified or not. As shown in fig. 2, the command issuing of all tests is issued by the control system and issued to each detection device through the switch or the communication manager.
In one embodiment, the low voltage ride through test is performed by a low voltage ride through test state comprising: when the voltage, the frequency and the power quality are disturbed, a power grid simulator is needed, the background control CB1 and the CB2 are closed, the CB3 is opened, and the CB4 is opened.
In one embodiment, the islanding test is performed through an islanding test state, which includes:
1) the control system controls the CB1 and the CB2 to be disconnected, the CB3 to be closed and the S1 to be closed at the background, so that the photovoltaic power generation system keeps stable operation. Measuring the active power and reactive power output of the photovoltaic power generation system to be tested through a power testing device;
2) the background controls to close CB4, and the inductor L, the capacitor C and the resistor R are sequentially put into the background, so that: the reactive power consumed by the LC is equal to the reactive power emitted by the tested power station, wherein the value of the LC is referred to by the following formula; the active power consumed by the RLC is equal to the active power sent by the tested station; the quality factor of the RLC resonant circuit is 1 +/-0.1; the fundamental current flowing through K2 is less than 5% of the measured photovoltaic plant output current.
3) The background control opens the CB3, and the time from the opening of the switch CB3 to the stop of the power supply of the photovoltaic power generation system to the AC load is recorded through a digital oscilloscope. And if the photovoltaic power generation system to be detected stops supplying power to the alternating current load within 2s, the detection is not continued.
Further, in one embodiment, the islanding generator is used for performing an islanding test in cooperation, and during the islanding test detection process, the islanding generator or related equipment is used for accurately simulating that the alternating-current resonance frequency is 50 Hz. The inductive load is larger than the capacitance, the resonant frequency is larger than 50Hz, the inductive load ratio is smaller than the capacitance, the resonant frequency is smaller than 50Hz, the parasitic quantity of components is too large, and the resonant frequency deviation can be caused. When the inverter island automatic protection test is tested, the protection is prevented from being caused by over-frequency or under-frequency instead of anti-island protection.
Further, in one embodiment, the background communicates with the detection device or a grid simulator, an oscilloscope, an island generation device, a power quality monitor and a power tester therein, and sets a test state confirmation. Wherein the test states include: a power grid adaptability test state, a low voltage ride through test state and an island test state. And an emergency stop button and a remote/local button are arranged on a power grid simulator, an oscilloscope, an island generating device, an electric energy quality monitor, a power tester, each circuit breaker, an external switch and the like of the detection device. The background is provided with a display structure for realizing the telemetering amount display of the states.
Further, in one embodiment, as shown in FIG. 3, the test procedure status is described as follows.
1) In a shutdown state: the shutdown state is used to indicate that the detection system is in a shutdown state. And in the shutdown state, all the circuit breakers and the contactors are in the disconnection positions, otherwise, an alarm page can display that the contactors are not disconnected.
And in the shutdown state, when the detection equipment is in a remote position and receives a background startup command, the detection equipment enters a standby state. And when the control operation fails, receiving an emergency stop signal or a safety chain action signal, and switching to a fault state.
2) Standby state: the standby state is a preparation work from the shutdown state to the test state. When any test detection device is shot to a remote place and the detection device is started, the test device enters a standby state, namely a test item command can be given to enter a test state.
In the standby state, when the background receives the emergency stop of the background detection equipment, the on-site state of all the equipment or the shutdown of the equipment, the standby state is switched to the shutdown state. And when the content of the remote detection item is selected, switching to a test state, and switching to a fault state when the control operation fails or the background receives an emergency stop signal or the background receives a safety chain action signal.
3) Test state
The test states are used for indicating entering into a detection test, wherein three test states are a power grid adaptability test state, a low voltage ride through test state and an island test state. Adaptability test state: and selecting a power grid adaptation test in a background workstation, and setting response parameters (voltage and frequency) and starting the test device at a remote place to obtain an adaptation test state. Low voltage ride through test state: and selecting a low-voltage ride through test in the background, setting corresponding parameters (fall time, fall mode and fall depth) of the test device at a remote place, and starting the test device to obtain a low-voltage ride through test state. An island test state: and selecting an island test in the background, setting corresponding parameters (R, L, C and corresponding circuit breakers) when the testing device is in a remote position, and starting the testing device to be an island test state. If one item is detected, the operation of other detection contents can not be operated. All operational parameter configuration and data can be completed and collected in the background.
And in the test state, automatically entering the standby state after the test is finished, if the test is carried out again, selecting the test state in the background, and selecting the detection content and the preset parameters, so that the test state can be entered again. And when any one of the situations of control operation failure, emergency stop signal received by the background, safety chain action signal received and background stop command received occurs, the fault state is switched to.
4) Failure state
The fault state is used for indicating that an abnormal condition occurs in the detection system. In a fault state, the background can default to open all the contactors.
In a fault state, when all the circuit breakers are in an off state, the 'emergency stop' button is not pressed down, and the safety chain is not started, the circuit breakers are switched to a stop state after a reset instruction is sent out at the background.
Further, in one embodiment, as shown in fig. 4, the system is powered on through the entrance, and then the detection device is remote (i.e. a remote device, the same applies below), and then enters the standby state.
And judging whether CB1 closing, CB2 closing, CB3 opening and CB4 opening exist simultaneously, if so, further judging whether the power grid simulator is far away, otherwise, entering a standby state, if so, continuously judging whether a low-voltage ride through test is started, if so, entering the low-voltage ride through test state and entering the standby state after the low-voltage ride through test is finished, and otherwise, entering the power grid adaptability test state and entering the standby state after the low-voltage ride through test is finished.
And judging whether CB1 closing, CB2 closing, CB3 closing and CB4 closing exist simultaneously, further judging whether an island generating device is far away or not when the result is negative, otherwise, entering a standby state, continuously judging whether CB1 closing, CB2 closing and S1 contract exist or not when the result is positive, and entering the island test state and entering the standby state after the judgment is positive. Further, in one embodiment, when the results existing in the processes of CB1 contract, CB2 contract and S1 contract are judged to be negative, the related information is fed back.
It should be noted that other embodiments of the present application further include a mobile photovoltaic grid-connected detection system formed by combining technical features of the above embodiments with each other and capable of being implemented.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the claims. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.
Claims (10)
1. The utility model provides a portable grid-connected PV detecting system which characterized in that includes: the device comprises a mobile device and a detection device arranged on the mobile device, wherein the detection device is also used for remotely connecting a control system;
the detection device is provided with a power grid simulator, an oscilloscope, an island generation device, an electric energy quality monitor and a power tester;
one end of the power grid simulator is used for being connected with a power grid through a first test circuit, and the other end of the power grid simulator is used for being connected with a photovoltaic power generation system to be tested through a second test circuit;
the islanding generating device is connected with the second test line,
the power quality monitor is connected with at least one of the first test line and the second test line;
the power tester is connected with at least one of the first test line and the second test line;
the detection device is provided with two power quality monitors and two power testers; one end of the power grid simulator is connected with a first test circuit through a first circuit breaker and is used for being connected with a power grid through the first test circuit; the other end of the power grid simulator is connected with a second test circuit through a second circuit breaker, and the second test circuit is connected with an external switch and is used for being connected with a photovoltaic power generation system to be tested through the external switch; one end of the third circuit breaker is connected with the first test circuit, and the other end of the third circuit breaker is connected with the second test circuit; the island generating device is connected with the second test circuit through a fourth circuit breaker; in the two power quality monitors, the first power quality monitor is connected with the first test circuit, the second power quality monitor is connected with the second test circuit, and the connection point of the second power quality monitor is positioned between the connection point of the fourth circuit breaker and the second test circuit and the second circuit breaker; in the two power testers, the first power tester is connected with the second test circuit, and the connection point of the first power tester is positioned between the connection point of the fourth circuit breaker and the second test circuit and the second circuit breaker; the oscilloscope is respectively connected with the third circuit breaker and the second test circuit, and is also used for connecting the photovoltaic power generation system to be tested;
the mobile photovoltaic grid-connected detection system also comprises a controller, the controller is connected with the detection device and is remotely connected with the control system, and the detection device is used for being remotely connected with the control system through the controller; the controller is used for receiving an instruction of the control system and controlling the detection device to detect according to the instruction;
the mobile photovoltaic grid-connected detection system also comprises a control system, an Ethernet switch and a communication manager; the Ethernet switch and the communication manager are both arranged on the mobile equipment; the detection device is directly connected with one of the Ethernet switch and the communication manager, and the communication manager is connected with the Ethernet switch so that the detection device is directly or indirectly connected with the Ethernet switch and the communication manager; the control system is remotely connected with the Ethernet switch and is connected with the detection device through the Ethernet switch.
2. The system according to claim 1, wherein the detection device is provided with two power quality monitors, wherein a first power quality monitor is connected to the first test line, and a second power quality monitor is connected to the second test line.
3. The system according to claim 1, wherein the detection device is provided with two power testers, and a connection point of the islanding generation device and the second test line is located between a connection point of a first power tester and the second test line and a connection point of a second power tester and the second test line.
4. The mobile grid-connected photovoltaic detection system of claim 1, wherein the grid is a low voltage distribution grid.
5. The mobile grid-connected photovoltaic detection system according to claim 1, wherein a connection point of the third circuit breaker and the second test line is located between a connection point of the second power quality monitor and the second test line and the second circuit breaker; the connection point of the third circuit breaker and the first test line is positioned between the connection point of the first power quality monitor and the first test line and the first circuit breaker; and the connection point of the oscilloscope and the second test line is positioned between the connection point of the first power tester and the second test line and the connection point of the fourth circuit breaker and the second test line.
6. The mobile grid-connected photovoltaic detection system according to claim 1, wherein the controller is connected to the grid simulator, the oscilloscope, the island generator, the power quality monitor, and the power tester, respectively, and configured to receive an instruction from the control system, and control the grid simulator, the oscilloscope, the island generator, the power quality monitor, and the power tester to perform detection according to the instruction.
7. The mobile grid-connected photovoltaic detection system of claim 1, further comprising an output device, wherein the output device is connected to the control system; the control system is further used for controlling the output device to generate and output detection results of the oscilloscope, the power tester, the electric energy quality monitor and the island generating device, and the detection results are used for providing safety evaluation and performance evaluation of the photovoltaic power generation system to be tested.
8. The system according to claim 1, wherein the control system is connected to the detection device through the ethernet switch, and comprises: the control system is directly connected with the detection device through the Ethernet switch, or the control system is sequentially connected with the detection device through the Ethernet switch and the communication manager.
9. The mobile grid-connected PV detection system of claim 1, further comprising a command validity checking module, wherein the command validity checking module is disposed on the mobile device and connected to the Ethernet switch, and the control system is connected to the detection device through the Ethernet switch and the command validity checking module; the instruction validity checking module is used for detecting the validity of the instruction issued by the control system, issuing the detection device when the instruction is valid and feeding back the control system when the instruction is invalid.
10. The mobile grid-connected photovoltaic detection system according to any one of claims 1 to 9, wherein the mobile device is a mobile trolley.
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| CN105515530A (en) * | 2016-01-21 | 2016-04-20 | 嘉兴清源电气科技有限公司 | Platform and method for grid-connected detection of photovoltaic power generation system |
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