Multifunctional comprehensive efficiency test method and system

Abstract

The invention discloses a multifunctional comprehensive efficiency testing method and system, and relates to the technical field of photovoltaic station comprehensive testing, and the method comprises the steps: combining all functional layers to form multifunctional comprehensive efficiency testing equipment; real-time monitoring and continuous wave recording are carried out through multifunctional comprehensive efficiency testing equipment; and comprehensive efficiency testing is carried out on the new energy station. According to the multifunctional comprehensive efficiency test method provided by the invention, the efficiency and applicability of a photovoltaic station test are improved through a multi-channel intelligent signal processing architecture, the operation stability of a photovoltaic power station is improved through a field programmable gate array cooperative processing architecture, the convenience of environmental data acquisition is improved through a wireless communication technology, and the test efficiency and applicability of the photovoltaic power station are improved. According to the method, the automation degree of photovoltaic power station testing is improved by combining an embedded Linux operating system, the data analysis precision is improved through multiple calculation models, and better effects are achieved in the aspects of testing efficiency, stability and analysis precision.

Description

Technical Field

[0001] The invention relates to the technical field of photovoltaic station comprehensive testing, and in particular to a multifunctional comprehensive efficiency testing method. Background Art

[0002] As an important component of clean energy, photovoltaic power generation has been widely used around the world in recent years. The construction scale of photovoltaic sites has been continuously expanded, and the efficiency evaluation and testing technology of photovoltaic power generation systems has gradually developed. Early photovoltaic testing technology mainly focuses on the performance detection of single photovoltaic modules or single-channel inverters, such as analyzing the output characteristics of solar cells through IV characteristic curves, or measuring the power conversion efficiency of inverters. However, with the application of multiple groups of series-parallel photovoltaic modules and the rise of large-scale photovoltaic power stations, the demand for multi-channel, multi-functional, and high-precision comprehensive testing systems is increasing. In recent years, new energy testing technology has gradually developed in the direction of intelligence and automation. Comprehensive testing platforms based on digital signal processing (DSP), embedded systems and computer networks have become a research hotspot. These systems can integrate multiple test functions to realize inverter efficiency testing, photovoltaic power station power quality measurement, IV curve measurement and other test tasks, thereby improving the accuracy and reliability of the test.

[0003] Although the existing photovoltaic field station testing technology has made certain progress, there are still many shortcomings. First, the existing test equipment is mainly single-function, lacking integrated and modular design, and cannot meet the needs of inverter efficiency testing, IV characteristic measurement and power quality analysis at the same time, resulting in a wide variety of test equipment, complex use and high testing costs. Secondly, the existing test equipment has a limited number of channels in the efficiency test of multi-channel integrated inverters, which is difficult to meet the needs of multi-group input parallel testing of photovoltaic fields. Especially when measuring the overall conversion efficiency of large-scale photovoltaic power stations, the existing technology is difficult to provide enough measurement channels. In addition, the test accuracy is limited by traditional signal acquisition and processing technology. , existing equipment usually uses transmitters for signal transmission, which may introduce errors and reduce the accuracy of the test. The lack of wireless communication function also requires complex wiring processes for existing equipment when obtaining environmental parameters (such as solar irradiance, temperature, etc.), which increases the complexity of the test. Finally, the software intelligence level of existing equipment is low, and it is difficult to provide efficient data analysis, trend prediction and automatic calibration functions, resulting in insufficient data processing capabilities and difficulty in meeting the needs of modern photovoltaic sites for efficient and accurate testing. Therefore, the existing technology has obvious defects in comprehensive testing capabilities, test accuracy, automation level and data processing capabilities, and it is difficult to support efficient operation and maintenance and performance optimization of the photovoltaic power generation industry. Summary of the invention

[0004] In view of the above-mentioned problems, the present invention is proposed.

[0005] Therefore, the technical problems solved by the present invention are: the existing photovoltaic field station testing method has a limited number of test channels, which is difficult to meet the needs of multi-group input parallel testing, and there are errors in the test accuracy, as well as how to improve the intelligence level of photovoltaic field station testing and optimize the data processing capabilities.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions: a multifunctional comprehensive efficiency testing method, comprising combining various functional layers to form a multifunctional comprehensive efficiency testing device; performing real-time monitoring and continuous wave recording through the multifunctional comprehensive efficiency testing device; and performing comprehensive efficiency testing on new energy stations.

[0007] As a preferred solution of the multifunctional comprehensive efficiency testing method described in the present invention, the multifunctional comprehensive efficiency testing device composed of the functional layers includes a signal processing layer, an application functional layer, and an extended functional layer. The signal processing layer is composed of an intelligent channel unit and a DSP. The signal processing layer performs waveform transformation, acquisition, and digital filtering on the signal, and performs true effective value calculation on the AC signal. The generated waveform, effective value, and switch status data are continuously written into the dual-port RAM connected to the PCIE bus. The application functional layer continuously reads the data buffered in the dual-port RAM through the PCIE bus, performs real-time monitoring, fault monitoring and recording, and trend chart functions, and publishes all data to remote clients in real time through Ethernet. The extended functional layer is implemented by a host computer software package, performs real-time monitoring of remote locations, and transmits and analyzes fault record data.

[0008] As a preferred embodiment of the multifunctional comprehensive efficiency testing method described in the present invention, the real-time monitoring and continuous recording by the multifunctional comprehensive efficiency testing equipment include real-time monitoring, real-time calculation of derived quantities as needed, and real-time calculation of signal harmonics and vector diagrams, and power quality analysis. The equipment serves as a data source, and real-time data is transmitted to a remote computer via a field bus, a computer network or a telephone dial-up. The remote computer aggregates data from various data sources, and configures application software as needed to realize trend recording, data statistics, system wiring diagrams, operating limit diagrams, parameter trend diagrams, and parameter reports.

[0009] As a preferred scheme of the multifunctional comprehensive efficiency testing method described in the present invention, the real-time monitoring and continuous recording by the multifunctional comprehensive efficiency testing equipment also includes continuous recording, continuously recording waveforms at a predefined sampling frequency, with a maximum recording time of 365 days, cyclic recording, and the recorded data is not lost when power is off, describing the long-term trend of the measured signal, and the recorded data is used to analyze slowly changing faults and long-term changing characteristics of load distribution, and provide data for changes in various parameters when the unit swings.

[0010] As a preferred scheme of the multifunctional comprehensive efficiency testing method described in the present invention, wherein: the comprehensive efficiency test of the new energy station includes an inverter efficiency test, and the inverter efficiency test is combined with a photovoltaic system environmental parameter acquisition device. The photovoltaic system environmental parameter acquisition device collects solar irradiance, ambient temperature, solar panel temperature, and ambient humidity. The data is transmitted wirelessly, and the input and output current, voltage and environmental parameters of the inverter are measured to calculate the power efficiency, energy efficiency, and PV system efficiency of the inverter, and evaluate the efficiency and loss of energy conversion.

[0011] As a preferred embodiment of the multifunctional comprehensive efficiency test method of the present invention, the comprehensive efficiency test of the new energy station also includes current-voltage curve measurement. When the solar cell exposed to light is connected to a load, the photocurrent flows through the load and generates terminal voltage at both ends of the load. The working condition of the solar cell is described by an equivalent circuit, which is expressed as:

[0012]

[0013] V=IR L

[0014] Where I is the current flowing into the load, V is the load terminal voltage, I L is the photocurrent, I D is the diode forward current, I O is the reverse saturation current of the diode, q is the electron charge, V D is the diode voltage, A is the diode ideality factor, K is the Boltzmann constant, T is the absolute temperature, R sh is the first parallel resistor, R S is the second parallel resistor, R L is the load, I sh is the bypass current. When the current flowing into the load is I, the load voltage is V, and the load R L When the load R changes from 0 to infinity, the load characteristic curve of the solar cell is obtained. L When the changes are continuous, a series of current and voltage data are obtained through measurement and the parameters are calculated.

[0015] As a preferred embodiment of the multifunctional comprehensive efficiency testing method described in the present invention, the comprehensive efficiency test of the new energy station also includes a power quality test, real-time calculation of the steady-state power quality parameters and electricity parameters of the grid-connected point, continuous recording of the trend charts of the power quality parameters and electricity parameters, and statistics of the maximum value, minimum value, and 95% probability maximum value of each parameter in the monitoring interval, statistics of the power quality parameters of a 10-minute sequence according to the background interval and each 10% power interval, and calculation of the net occurrence value of harmonics or interharmonics and long-term flicker, under various operating conditions such as normal operation of the electric field, grid connection, and normal shutdown, continuous monitoring of 1-minute active power changes and 10-minute active power changes, and recording the maximum value of 1-minute active power changes and 10-minute active power changes.

[0016] Another object of the present invention is to provide a multifunctional comprehensive efficiency testing system, which can comprehensively measure and analyze the comprehensive efficiency of new energy stations through a comprehensive testing module, thereby solving the current problems of difficulty in conducting comprehensive testing of photovoltaic power stations, large errors in test results, and difficulty in adapting to different photovoltaic power station environments.

[0017] As a preferred solution of the multifunctional comprehensive efficiency testing system described in the present invention, it includes: an equipment composition module, a monitoring and recording module, and a comprehensive testing module; the equipment composition module is used to combine various functional layers to form a multifunctional comprehensive efficiency testing device; the monitoring and recording module is used to perform real-time monitoring and continuous recording through the multifunctional comprehensive efficiency testing device; the comprehensive testing module is used to perform comprehensive efficiency testing on new energy stations.

[0018] A computer device includes a memory and a processor, wherein the memory stores a computer program, and wherein the processor executes the computer program to implement a step of a multifunctional comprehensive efficiency testing method.

[0019] A computer-readable storage medium stores a computer program, wherein the computer program implements the steps of a multifunctional comprehensive efficiency testing method when executed by a processor.

[0020] Beneficial effects of the present invention: The multifunctional comprehensive efficiency testing method provided by the present invention improves the efficiency and applicability of photovoltaic field station testing through a multi-channel intelligent signal processing architecture, adopts a field programmable gate array collaborative processing architecture, improves the operating stability of photovoltaic power stations, and improves the convenience of environmental data collection through wireless communication technology. In combination with an embedded Linux operating system, the degree of automation of photovoltaic power station testing is improved. Through a variety of calculation models, the accuracy of data analysis is improved. The present invention achieves better results in terms of test efficiency, stability and analysis accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0022] Figure 1 An overall flow chart of a multifunctional comprehensive efficiency testing method provided for the first embodiment of the present invention.

[0023] Figure 2 A functional hierarchy diagram of a multifunctional comprehensive efficiency testing method provided for the first embodiment of the present invention.

[0024] Figure 3 A system structure diagram of a multifunctional comprehensive efficiency testing method provided for the first embodiment of the present invention.

[0025] Figure 4 An equivalent circuit diagram of a solar cell according to a multifunctional comprehensive efficiency testing method provided by the first embodiment of the present invention.

[0026] Figure 5 A solar cell volt-ampere characteristic curve diagram of a multifunctional comprehensive efficiency testing method provided by the first embodiment of the present invention.

[0027] Figure 6 A data flow diagram of a monitor and recorder of a multifunctional comprehensive efficiency testing method provided for the first embodiment of the present invention.

[0028] Figure 7 A chassis layout diagram of a multifunctional comprehensive efficiency testing method provided for the first embodiment of the present invention.

[0029] Figure 8 A schematic diagram of inverter efficiency test software for a multifunctional comprehensive efficiency test method provided in the first embodiment of the present invention.

[0030] Fig. 9 An overall module diagram of a multifunctional comprehensive efficiency testing system provided for the third embodiment of the present invention. DETAILED DESCRIPTION

[0031] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0032] Example 1

[0033] Reference Figure 1-Figure 8 , as an embodiment of the present invention, provides a multifunctional comprehensive efficiency testing method, comprising:

[0034] S1: Combine various functional layers to form a multifunctional comprehensive efficiency testing device.

[0035] Furthermore, each functional layer is combined to form a multifunctional comprehensive efficiency testing device including a signal processing layer, an application functional layer, and an extended functional layer.

[0036] It should be noted that the signal processing layer is composed of an intelligent channel unit and a DSP. The signal processing layer performs waveform transformation, acquisition, digital filtering, and true effective value calculation on the AC signal. The generated waveform, effective value, and switch status data are continuously written into the dual-port RAM connected to the PCIE bus. The application function layer continuously reads the data buffered in the dual-port RAM through the PCIE bus, performs real-time monitoring, fault monitoring and recording, and trend chart functions, and publishes all data to remote clients in real time through Ethernet. The extended function layer is implemented by the host computer software package, which performs real-time monitoring of remote locations and transmits and analyzes fault record data.

[0037] It should also be noted that the equipment uses a data acquisition and processing platform built based on digital signal processors (DSP), embedded operating systems, computer networks and other technologies. The platform includes components such as data acquisition filtering, calculations, drivers, and communication functions. At the front end of the acquisition platform, it is equipped with an intelligent processing channel specially designed for photovoltaic equipment. The measured signal does not need to pass through the transmitter and can be directly connected to the instrument. On top of the acquisition platform, multiple application layer software modules are configured, including real-time monitoring, efficiency testing, IV testing and other functions.

[0038] It should also be noted that the basic data such as AC or DC voltage and current of the photovoltaic power station can be collected in real time through the analog channel. At the same time, the equipment has wireless communication function, which can communicate with some devices through serial wireless communication to obtain corresponding data. These data are used for real-time processing by software to carry out measurements of inverter efficiency test, IV test, power quality and other new energy station tests.

[0039] It should also be noted that the analog channel conditioning module performs electrical isolation transformation on the input signal, converting strong electric signals such as AC150V or DC2000V into 5V signals for input AD devices. For the voltage input module, the front end is equipped with an overvoltage protection unit. The channel's zero point, coefficient, ratio, anti-aliasing low-pass filter and other attribute parameters are stored in the module's built-in I2CEEPROM. These parameters are read by the DSP and used to construct the software processing parameters of the signal.

[0040] The device has a total of 24 analog channels. The AD device uses 4 AD7656s to achieve synchronous sampling and a single-channel maximum sampling rate of 100kHz. The AD7656 has 6 fully differential input channels with 80DB common-mode rejection, six 4μs continuous approximation analog-to-digital converters, and six differential sampling amplifiers. The conversion data results are read out by the DSP through a parallel output bus.

[0041] In the device, the task of DSP is to drive, read A / D converter, digital filtering, effective value calculation, data queue management, and send periodic interrupt signals to PC104+ module. Among them, data processing includes selecting LPF according to the current sampling frequency and low-pass filtering the signal;

[0042] In the device, one side of the dual-port RAM is mapped to the PCIE bus memory space, and the other side is connected to the external storage space of the DSP. The task of the dual-port RAM is to store data queues, parameters, and instructions for access by the DSP and PCIE bus, and provide interrupt signals to both sides;

[0043] The device plans to use a high-performance industrial control CPU module, which has a PCIE bus. The PCIE bus is bridged to the dual-port RAM through an FPGA. Under the scheduling of the driver, it is driven by the periodic interrupt signal from the DSP to periodically start the bus master group burst transmission. No CPU instruction operation is required, and data is transferred to the memory buffer specified by the driver in DMA mode.

[0044] It should also be noted that the main links of the device include DSP program, Linux device driver, and Linux application. The three links are actually three functional layers. The lower layer provides services for the upper layer, and instructions and data are transmitted between layers through interrupts and call interfaces. The DSP program completes data acquisition, filtering, and dual-port RAM queue input. The device driver is the middle link and is a buffer for data flow. The Linux application completes data calculation as well as interface and communication services. Each link uses different development tools and language environments, and must adopt different software design and writing methods.

[0045] S2: Real-time monitoring and continuous recording are carried out through multifunctional comprehensive efficiency test equipment.

[0046] Furthermore, real-time monitoring and continuous wave recording including real-time monitoring are carried out through multifunctional comprehensive efficiency testing equipment.

[0047] It should be noted that derived quantity calculations are performed in real time as needed, and signal harmonics and vector diagrams are calculated in real time to perform power quality analysis. The equipment serves as the data source, and real-time data is transmitted to the remote computer via the field bus, computer network or telephone dial-up. The remote computer aggregates the data from each data source and configures the application software as needed to achieve trend recording, data statistics, system wiring diagrams, operating limit diagrams, parameter trend diagrams, and parameter reports.

[0048] Furthermore, real-time monitoring and continuous recording are performed through a multifunctional comprehensive efficiency testing device, and continuous recording is also included.

[0049] It should be noted that the waveform is recorded continuously at a predefined sampling frequency for a maximum of 365 days in a loop. The recorded data will not be lost when power is off. The long-term trend of the measured signal is described. The recorded data is used to analyze slowly changing faults and long-term changing characteristics of load distribution, and provide data for changes in various parameters when the unit swings.

[0050] S3: Conduct comprehensive efficiency tests on new energy stations.

[0051] Furthermore, comprehensive efficiency tests are conducted on new energy stations, including inverter efficiency tests.

[0052] It should be noted that the inverter efficiency test is carried out in conjunction with a photovoltaic system environmental parameter collection device. The photovoltaic system environmental parameter collection device collects solar irradiance, ambient temperature, solar panel temperature, and ambient humidity. The data is transmitted wirelessly. By measuring the input and output current, voltage, and environmental parameters of the inverter, the power efficiency, energy efficiency, and PV system efficiency of the inverter are calculated, and the efficiency and loss of energy conversion are evaluated.

[0053] It should also be noted that the inverter is a relatively important core component in the photovoltaic power generation system. It is used to convert the direct current of the PV module into alternating current so that it can be connected to the power grid or drive the AC load. The inverter efficiency test can be applied to the photovoltaic power station energy system or power system to evaluate the performance of the PV system that operates independently or is connected to the grid.

[0054] Furthermore, comprehensive efficiency testing of new energy stations also includes current and voltage curve measurements.

[0055] It should be noted that when a solar cell exposed to light is connected to a load, the photocurrent flows through the load and generates a terminal voltage at both ends of the load. The working condition of the solar cell can be described by an equivalent circuit, which is expressed as:

[0056]

[0057] V=IR L

[0058] Where I is the current flowing into the load, V is the load terminal voltage, I L is the photocurrent, ID is the diode forward current, I O is the reverse saturation current of the diode, q is the electron charge, V D is the diode voltage, A is the diode ideality factor, K is the Boltzmann constant, T is the absolute temperature, R sh is the first parallel resistor, R S is the second parallel resistor, R L is the load, I sh is the bypass current. When the current flowing into the load is I, the load voltage is V, and the load R L When the load R changes from 0 to infinity, the load characteristic curve of the solar cell is obtained. L When the changes are continuous, a series of current and voltage data are obtained through measurement and the parameters are calculated.

[0059] It should also be noted that Figure 4 The solar cell is used as a stable photocurrent I L A current source (light source stability) is connected in parallel with a diode in forward bias and a parallel resistor R sh , the forward current of the diode I D and bypass current I sh All I L Provided that the remaining photocurrent flows through a series resistor R S Inflow load R L .

[0060] It should also be noted that Figure 5 Each point on the curve is called an operating point, and the line connecting the operating point and the origin is called a load line, with a slope of The horizontal and vertical coordinates of the working point are the corresponding working voltage and working current. If the load resistance R is changed L Reach a specific value R m At this time, a point M is obtained on the curve, corresponding to the maximum product of the working current and the working voltage, P m =I m ×V m , point M is called the maximum power point of the solar cell, where I m is the optimal operating current, V m is the optimal working voltage, R m is the optimal load resistance, P m For maximum output power, when the load R L When the current and voltage are continuously changing, a series of current and voltage data are obtained through measurement, and the open circuit voltage V is calculated. oc , short circuit current I sc , fill factor FF, series resistance R S , parallel resistance Rsh and battery efficiency η.

[0061] Furthermore, comprehensive efficiency testing of new energy stations also includes power quality testing.

[0062] It should be noted that the steady-state power quality parameters and quantity parameters of the grid-connected point are calculated in real time, the trend charts of the power quality parameters and quantity parameters are continuously recorded, and the maximum value, minimum value and 95% probability maximum value of each parameter in the monitoring interval are statistically analyzed. The power quality parameters of a 10-minute sequence are statistically analyzed according to the background interval and each 10% power interval, and the net occurrence value of harmonics or interharmonics and long-term flicker is calculated. Under various operating conditions such as normal operation of the electric field, grid connection, and normal shutdown, the 1-minute active power change and the 10-minute active power change are continuously monitored, and the maximum value of the 1-minute active power change and the maximum value of the 10-minute active power change are recorded.

[0063] It should also be noted that electrical quantity parameters include frequency, voltage, unbalance, flicker, harmonics, etc., among which the measurement types of harmonics include harmonics, harmonic groups, harmonic subgroups, interharmonic groups, and interharmonic center subgroups.

[0064] It should also be noted that in order to ensure the accuracy of the series of parameters of harmonic analysis, a synchronous sampling mode is adopted, based on the synchronous sampling of digital phase-locked loop technology, to maintain high-precision synchronization with the fundamental frequency of the power system, and the data is sampled in a window of 10 fundamental cycles for discrete Fourier transform (DFT) to obtain a frequency spectrum with a frequency resolution of 5 Hz, ensuring the accuracy of parameters such as harmonics, harmonic (sub) groups, interharmonic (central sub) groups, and THD.

[0065] It should also be noted that the software contains a wealth of analytical calculation functions. In addition to general operations such as addition, subtraction, multiplication, division, integration, overshoot, time constant, number of oscillations, etc., it also includes analytical calculation functions in specific test items. The software has rich data curve analysis functions, multiple data overlay comparison, report generation and other functions, which can improve test efficiency, measurement accuracy and data processing capabilities, and realize the automation of electrical tests.

[0066] Example 2

[0067] An embodiment of the present invention provides a multifunctional comprehensive efficiency testing method. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through economic benefit calculation and simulation experiments.

[0068] The test contents of this experiment include inverter efficiency, maximum power point of IV curve, power quality THD (total harmonic distortion), environmental parameters (temperature, solar irradiance) and system energy conversion efficiency. The experiment was carried out in a 100kW photovoltaic power station to compare the performance of traditional test equipment and the test equipment of the present invention. This experiment selected three typical inverters of the 100kW photovoltaic power station and measured them using traditional test equipment and the test equipment of the present invention respectively.

[0069] Traditional equipment was used to measure the efficiency, IV curve, and power quality of the three sample inverters and record the data. Since traditional equipment relies on transmitters for signal transmission, there may be data deviations and the measurement process is time-consuming. In the grid-connected power quality test, traditional equipment has low data processing capabilities, resulting in large measurement errors of high-order harmonic components.

[0070] The test equipment of the present invention is used to directly collect signals from photovoltaic modules and inverters, realize multi-channel synchronous measurement, and improve measurement efficiency. The equipment realizes high-precision data calculation through DSP+FPGA collaborative processing, improves the measurement accuracy of IV curve, ensures the accuracy of maximum power point calculation, adopts a wireless environment monitoring system to obtain parameters such as solar irradiance and temperature, reduces manual wiring and measurement errors, improves data consistency, and adopts a DFT-based synchronous sampling algorithm to ensure accurate harmonic measurement data and significantly reduce power quality THD measurement errors.

[0071] As shown in Table 1, since the present invention adopts high-precision signal acquisition and synchronous measurement technology, the errors that may be introduced by traditional transmitters are avoided, making the inverter efficiency measurement more accurate. The device of the present invention can more accurately measure the volt-ampere characteristics of photovoltaic modules, ensure the accuracy of maximum power point calculation, help optimize the operation strategy of the photovoltaic system, and improve the overall power generation efficiency. The DFT-based synchronous sampling algorithm adopted by the present invention improves the accuracy of harmonic measurement, significantly optimizes the quality of photovoltaic grid connection, and helps to improve the stability of the power grid. Since the present invention integrates a wireless sensor network, it can synchronously obtain environmental parameters and automatically correct measurement errors, avoiding the inconsistency problem that may be caused by manual data input in traditional equipment. The improvement of system energy conversion efficiency is due to the more accurate IV curve analysis and inverter optimization parameter calculation provided by the device of the present invention, which reduces system energy loss and improves the conversion efficiency of the overall photovoltaic power station.

[0072] Table 1 Experimental data table

[0073]

[0074] Example 3

[0075] Reference Fig. 9, as an embodiment of the present invention, provides a multifunctional comprehensive efficiency testing system, including: an equipment composition module, a monitoring and recording module, and a comprehensive testing module.

[0076] The equipment composition module is used to combine various functional layers to form a multifunctional comprehensive efficiency testing device; the monitoring and recording module is used to perform real-time monitoring and continuous recording through the multifunctional comprehensive efficiency testing device; and the comprehensive testing module is used to perform comprehensive efficiency testing on new energy stations.

[0077] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0078] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0079] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering, or processing in another suitable manner as necessary, and then stored in a computer memory.

[0080] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc. It should be noted that the above embodiments are only used to illustrate the technical solution of the present invention and are not limited. Although the present invention is described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention, which should be included in the scope of the claims of the present invention.

[0081] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A multifunctional comprehensive efficiency testing method, characterized in that: include: Combining various functional layers to form a multifunctional comprehensive efficiency testing device; Real-time monitoring and continuous wave recording are carried out through multifunctional comprehensive efficiency test equipment; Conduct comprehensive efficiency tests on new energy stations.

2. The multifunctional comprehensive efficiency testing method according to claim 1, characterized in that: The multifunctional comprehensive efficiency test equipment is composed of a combination of various functional layers, including a signal processing layer, an application functional layer, and an extended functional layer. The signal processing layer is composed of an intelligent channel unit and a DSP. The signal processing layer performs waveform transformation, acquisition, and digital filtering on the signal, and performs true effective value calculation on the AC signal. The generated waveform, effective value, and switch status data are continuously written into a dual-port RAM connected to a PCIE bus. The application functional layer continuously reads the data buffered in the dual-port RAM through the PCIE bus, performs real-time monitoring, fault monitoring and recording, and trend chart functions, and publishes all data to a remote client in real time through Ethernet. The extended functional layer is implemented by a host computer software package, performs real-time monitoring of remote locations, and transmits and analyzes fault record data.

3. The multifunctional comprehensive efficiency testing method according to claim 2, characterized in that: The real-time monitoring and continuous recording by the multifunctional comprehensive efficiency test equipment include real-time monitoring, real-time calculation of derived quantities as needed, real-time calculation of signal harmonics and vector diagrams, and power quality analysis. The equipment serves as a data source, and real-time data is transmitted to a remote computer via a field bus, a computer network or a dial-up telephone. The remote computer aggregates data from various data sources and configures application software as needed to realize trend recording, data statistics, system wiring diagrams, operating limit diagrams, parameter trend diagrams, and parameter reports.

4. The multifunctional comprehensive efficiency testing method according to claim 3, characterized in that: The real-time monitoring and continuous recording by the multifunctional comprehensive efficiency test equipment also includes continuous recording, which continuously records waveforms at a predefined sampling frequency. The recording time is up to 365 days. The recording is cyclic and the recorded data is not lost when the power is off. The long-term trend of the measured signal is described. The recorded data is used to analyze slowly changing faults and long-term changing characteristics of load distribution, and provide data for changes in various parameters when the unit swings.

5. The multifunctional comprehensive efficiency testing method according to claim 4, characterized in that: The comprehensive efficiency test of the new energy station includes an inverter efficiency test. The inverter efficiency test is combined with a photovoltaic system environmental parameter collection device to collect solar irradiance, ambient temperature, solar panel temperature, and ambient humidity. The data is exchanged wirelessly and the input and output current, voltage, and environmental parameters of the inverter are measured to calculate the power efficiency, energy efficiency, and PV system efficiency of the inverter, and evaluate the efficiency and loss of energy conversion.

6. The multifunctional comprehensive efficiency testing method according to claim 5, characterized in that: The comprehensive efficiency test of the new energy station also includes current-voltage curve measurement. When the solar cell under illumination is connected to a load, the photocurrent flows through the load and generates terminal voltage at both ends of the load. The working condition of the solar cell is described by an equivalent circuit, which is expressed as: V=IR L Where I is the current flowing into the load, V is the load terminal voltage, I L is the photocurrent, I D is the diode forward current, I O is the reverse saturation current of the diode, q is the electron charge, V D is the diode voltage, A is the diode ideality factor, K is the Boltzmann constant, T is the absolute temperature, R sh is the first parallel resistor, R S is the second parallel resistor, R L is the load, I sh is the bypass current. When the current flowing into the load is I, the load voltage is V, and the load R L When the load R changes from 0 to infinity, the load characteristic curve of the solar cell is obtained. L When the changes are continuous, a series of current and voltage data are obtained through measurement and the parameters are calculated.

7. The multifunctional comprehensive efficiency testing method according to claim 6, characterized in that: The comprehensive efficiency test of the new energy station also includes a power quality test, real-time calculation of the steady-state power quality parameters and electricity parameters of the grid-connected point, continuous recording of the trend charts of the power quality parameters and electricity parameters, and statistics of the maximum value, minimum value, and 95% probability maximum value of each parameter in the monitoring interval, statistics of the power quality parameters of a 10-minute sequence according to the background interval and each 10% power interval, and calculation of the net occurrence value of harmonics or interharmonics, and long-term flicker, and under various operating conditions such as normal operation of the electric field, grid connection, and normal shutdown, continuous monitoring of 1-minute active power changes and 10-minute active power changes, and recording the maximum value of 1-minute active power changes and 10-minute active power changes.

8. A system using the multifunctional comprehensive efficiency testing method according to any one of claims 1 to 7, characterized in that: It includes equipment composition module, monitoring and recording module, and comprehensive testing module; The equipment composition module is used to combine various functional layers to form a multifunctional comprehensive efficiency test equipment; The monitoring and recording module is used to perform real-time monitoring and continuous recording through the multifunctional comprehensive efficiency testing equipment; The comprehensive test module is used to perform comprehensive efficiency tests on new energy stations.

9. A computer device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the multifunctional comprehensive efficiency testing method described in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the multifunctional comprehensive efficiency testing method described in any one of claims 1 to 7 are implemented.

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