CN110940851A - Power detection device and method for modular programmable photovoltaic system - Google Patents
Power detection device and method for modular programmable photovoltaic system Download PDFInfo
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- CN110940851A CN110940851A CN201911124208.3A CN201911124208A CN110940851A CN 110940851 A CN110940851 A CN 110940851A CN 201911124208 A CN201911124208 A CN 201911124208A CN 110940851 A CN110940851 A CN 110940851A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R21/00—Arrangements for measuring electric power or power factor
- G01R21/06—Arrangements for measuring electric power or power factor by measuring current and voltage
Abstract
The invention discloses a device and a method for detecting power of a modularized programmable photovoltaic system, belonging to the field of a test method of a photovoltaic power generation system, and comprising a test host, an expansion module and a grid-connected inverter; the testing host machine measures voltage and current channels of the grid-connected inverter through the extension module, communicates with the extension module through the RS485 communication cable, and is cascaded through the built-in RS485 communication module to realize extension of the testing channel of the testing host machine; the test host sends a broadcast instruction to scan the extension module, the extension module sends a module number to the test host after receiving the broadcast instruction of the test host, connection is established, and the instruction of the test host is received to carry out testing and data transmission. According to the invention, the RS485 communication mode can be adopted for cascade measurement according to the use requirement, so that the test communication cost is reduced, the test channel is expanded, and the problem of simultaneous measurement and analysis of data of multiple voltage channels and multiple current channels is solved.
Description
Technical Field
The invention belongs to the field of photovoltaic power generation system test methods, and particularly relates to a modularized programmable photovoltaic system power detection device and method.
Background
At present, the domestic photovoltaic power generation technology is rapidly developed, the number of types of inverters is increased, and the power is increased. When power detection is performed on a photovoltaic power generation system, for a centralized inverter and a string inverter, due to different designs of the inverters, corresponding voltage and current channels are also diversified, a direct current voltage input channel of the string inverter is generally more than 6 channels, and a direct current input channel is generally more than 12 channels, so that how to simultaneously measure and analyze data of all voltage and current channels of the inverter to be detected is an important problem faced by current photovoltaic testing.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the modularized programmable photovoltaic system power detection method which is reasonable in design, overcomes the defects in the prior art and has a good effect.
In order to achieve the purpose, the invention adopts the following technical scheme:
a modularized programmable photovoltaic system power detection device comprises a test host, an expansion module and a grid-connected inverter; the testing host machine measures voltage and current channels of the grid-connected inverter through the extension module, communicates with the extension module through the RS485 communication cable, and is cascaded through the built-in RS485 communication module to realize extension of the testing channel of the testing host machine;
the test host sends a broadcast instruction to scan the extension module, the extension module sends a module number to the test host after receiving the broadcast instruction of the test host, connection is established, and the instruction of the test host is received to carry out testing and data transmission.
Preferably, the expansion module has an RS485 communication function, measures an inverter of the photovoltaic power generation system, and has three ac voltage test channels, three ac current test channels, three dc voltage test channels, and three dc current test channels, and detects voltage, current, power, and power generation of the photovoltaic power generation system.
Preferably, the test host supports an RS485 communication function, has three alternating voltage test channels, three alternating current test channels, one direct voltage test channel and one direct current test channel, and has functions of measuring and analyzing voltage, current, power generation and harmonic waves.
Preferably, the test host firstly sets test parameters of the expansion module, wherein the test parameters comprise a test time interval, a current clamp transformation ratio coefficient, the number of direct-current voltage test channels, the number of direct-current test channels, the number of alternating-current voltage test channels and the number of alternating-current test channels;
if the expansion module does not receive the test parameters sent by the test host, setting according to the test parameters received last time;
after the parameters are set, the expansion module receives a test starting instruction sent by the test host, detects corresponding voltage and current values, calculates power and power generation amount, receives a data reading instruction sent by the test host and sends data to the test host;
and if the expansion module does not receive the read data instruction sent by the test host after the single test is finished after receiving the test starting instruction of the test host, storing all the test data, and sending all the stored test data to the test host after receiving the read data instruction sent by the test host next time.
In addition, the invention also provides a power detection method of the modularized programmable photovoltaic system, which adopts the power detection device of the modularized programmable photovoltaic system, and specifically comprises the following steps:
step S201: the test host sends a broadcast instruction to scan the expansion module;
step S202: if the test host sends the test parameters to the expansion module, step S203 is entered; if the test host does not send the test parameters to the expansion module, the step S204 is entered;
step S203: the expansion module receives and sets test parameters;
step S204: the expansion module is set according to the recently received test parameters;
step S205: the test host sends a test instruction to the expansion module, and the expansion module measures voltage and current data and calculates power;
step S206: if the test host sends a read data command to the expansion module, the step S207 is performed, and if the test host does not send a read data command to the expansion module, the step S208 is performed;
step S207: the expansion module sends the test data to the test host;
step S208: the expansion module stores the test data.
The invention has the following beneficial technical effects:
according to the invention, the RS485 communication mode can be adopted for cascade measurement according to the use requirement, so that the test communication cost is reduced, the test channel is expanded, and the problem of simultaneous measurement and analysis of data of multiple voltage channels and multiple current channels is solved.
Drawings
FIG. 1 is a schematic structural diagram of a testing apparatus according to the present invention.
FIG. 2 is a block flow diagram of a testing method of the present invention.
Detailed Description
The invention is described in further detail below with reference to the following figures and detailed description:
example 1:
as shown in fig. 1, a power detection apparatus for a modular programmable photovoltaic system includes a test host, an expansion module, and a grid-connected inverter; the testing host machine measures voltage and current channels of the grid-connected inverter through the extension module, communicates with the extension module through the RS485 communication cable, and is cascaded through the built-in RS485 communication module to realize extension of the testing channel of the testing host machine;
the test host sends a broadcast instruction to scan the extension module, the extension module sends a module number to the test host after receiving the broadcast instruction of the test host, connection is established, and the instruction of the test host is received to carry out testing and data transmission.
The expansion module has an RS485 communication function, measures an inverter of the photovoltaic power generation system, and is provided with three alternating voltage test channels, three alternating current test channels, three direct voltage test channels and three direct current test channels to detect the voltage, the current, the power and the generated energy of the photovoltaic power generation system.
The test host supports the RS485 communication function, has three alternating voltage test channels, three alternating current test channels, one direct voltage test channel and one direct current test channel, and has the functions of measuring and analyzing voltage, current, power, generating capacity and harmonic waves.
The test host computer firstly sets test parameters of the expansion module, wherein the test parameters comprise a test time interval, a current clamp transformation ratio coefficient, the number of direct current voltage test channels, the number of direct current test channels, the number of alternating current voltage test channels and the number of alternating current test channels;
if the expansion module does not receive the test parameters sent by the test host, setting according to the test parameters received last time;
after the parameters are set, the expansion module receives a test starting instruction sent by the test host, detects corresponding voltage and current values, calculates power and power generation amount, receives a data reading instruction sent by the test host and sends data to the test host;
and if the expansion module does not receive the read data instruction sent by the test host after the single test is finished after receiving the test starting instruction of the test host, storing all the test data, and sending all the stored test data to the test host after receiving the read data instruction sent by the test host next time.
Example 2:
on the basis of the above embodiment 1, the present invention further provides a power detection method for a modular programmable photovoltaic system, the flow of which is shown in fig. 2, and the method specifically includes the following steps:
step S201: the test host sends a broadcast instruction to scan the expansion module;
step S202: if the test host sends the test parameters to the expansion module, step S203 is entered; if the test host does not send the test parameters to the expansion module, the step S204 is entered;
step S203: the expansion module receives and sets test parameters;
step S204: the expansion module is set according to the recently received test parameters;
step S205: the test host sends a test instruction to the expansion module, and the expansion module measures voltage and current data and calculates power;
step S206: if the test host sends a read data command to the expansion module, the step S207 is performed, and if the test host does not send a read data command to the expansion module, the step S208 is performed;
step S207: the expansion module sends the test data to the test host;
step S208: the expansion module stores the test data.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (5)
1. A modularized programmable photovoltaic system power detection device is characterized in that: the system comprises a test host, an expansion module and a grid-connected inverter; the testing host machine measures voltage and current channels of the grid-connected inverter through the extension module, communicates with the extension module through the RS485 communication cable, and is cascaded through the built-in RS485 communication module to realize extension of the testing channel of the testing host machine;
the test host sends a broadcast instruction to scan the extension module, the extension module sends a module number to the test host after receiving the broadcast instruction of the test host, connection is established, and the instruction of the test host is received to carry out testing and data transmission.
2. The modular programmable photovoltaic system power detection apparatus of claim 1, wherein: the expansion module has an RS485 communication function, measures an inverter of the photovoltaic power generation system, and is provided with three alternating voltage test channels, three alternating current test channels, three direct voltage test channels and three direct current test channels to detect the voltage, the current, the power and the generated energy of the photovoltaic power generation system.
3. The modular programmable photovoltaic system power detection apparatus of claim 1, wherein: the test host supports the RS485 communication function, has three alternating voltage test channels, three alternating current test channels, one direct voltage test channel and one direct current test channel, and has the functions of measuring and analyzing voltage, current, power, generating capacity and harmonic waves.
4. The modular programmable photovoltaic system power detection apparatus of claim 1, wherein: the test host computer firstly sets test parameters of the expansion module, wherein the test parameters comprise a test time interval, a current clamp transformation ratio coefficient, the number of direct current voltage test channels, the number of direct current test channels, the number of alternating current voltage test channels and the number of alternating current test channels;
if the expansion module does not receive the test parameters sent by the test host, setting according to the test parameters received last time;
after the parameters are set, the expansion module receives a test starting instruction sent by the test host, detects corresponding voltage and current values, calculates power and power generation amount, receives a data reading instruction sent by the test host and sends data to the test host;
and if the expansion module does not receive the read data instruction sent by the test host after the single test is finished after receiving the test starting instruction of the test host, storing all the test data, and sending all the stored test data to the test host after receiving the read data instruction sent by the test host next time.
5. A power detection method for a modularized programmable photovoltaic system is characterized by comprising the following steps: the power detection device of the modular programmable photovoltaic system according to claim 1, comprising:
step S201: the test host sends a broadcast instruction to scan the expansion module;
step S202: if the test host sends the test parameters to the expansion module, step S203 is entered; if the test host does not send the test parameters to the expansion module, the step S204 is entered;
step S203: the expansion module receives and sets test parameters;
step S204: the expansion module is set according to the recently received test parameters;
step S205: the test host sends a test instruction to the expansion module, and the expansion module measures voltage and current data and calculates power;
step S206: if the test host sends a read data command to the expansion module, the step S207 is performed, and if the test host does not send a read data command to the expansion module, the step S208 is performed;
step S207: the expansion module sends the test data to the test host;
step S208: the expansion module stores the test data.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112653392A (en) * | 2020-12-17 | 2021-04-13 | 中电科仪器仪表(安徽)有限公司 | Photovoltaic power station multi-group string multi-component power detection device and method |
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| CN103472331A (en) * | 2013-09-13 | 2013-12-25 | 同济大学 | Photovoltaic power generation fault diagnosis system based on photovoltaic physical model |
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- 2019-11-18 CN CN201911124208.3A patent/CN110940851A/en active Pending
Patent Citations (5)
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| CN201311461Y (en) * | 2008-11-28 | 2009-09-16 | 皇明太阳能集团有限公司 | Grid-connection photovoltaic data detecting system |
| CN202649334U (en) * | 2012-04-13 | 2013-01-02 | 珈伟太阳能科技(上海)有限公司 | Alternating current collector based on information system of photovoltaic power station |
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| CN103472331A (en) * | 2013-09-13 | 2013-12-25 | 同济大学 | Photovoltaic power generation fault diagnosis system based on photovoltaic physical model |
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