KR101920739B1 - Multi-inverter PV monitoring system - Google Patents

Abstract

The present invention relates to a system for monitoring a solar power generation facility of a multiple inverter system.
Problems to be solved by the present invention are as follows.
That is, there is a limit in the number of physical connection of serial communication in the multi-inverter type solar power generation system, an increase in communication load due to an excessive number of variables, a total system error due to stoppage of some inverters, .
For this, the generation output is determined by the sum of the movable inverters, and the cumulative generation amount is determined by the sum of the received value of the movable inverter (response inverter) and the final stored value of the non-active inverter (non-responsive inverter) It is determined by the state data of the inverter composed of codes.
In addition, a standard node with a collecting, analyzing and transmitting function can be utilized by assigning a layer-by-layer identification code (communication ID).
Finally, a monitoring unit supporting the local management status window of the grouped multiple inverters is presented.
The present invention has the following effects.
In other words, it is possible to overcome the limit of the number of physical connection of the serial communication in the multiple inverter type solar power generation system, to reduce the communication load by selecting the variable items, to prevent the total sum error even when the inverter is stopped, It is advantageous in that the management of the system can be facilitated.
In addition, if the size of multiple inverters is small, it can be configured as a single data collection unit. If the size of multiple inverters is large, it can be configured as a data collection unit at various stages. Therefore, .

Description

Multiple Inverter Solar Power Monitoring System {omitted}

The present invention relates to a system for monitoring a solar power generation facility of a multiple inverter system.

Generally, inverter of existing solar power plant constitutes network by using RS485 serial communication method and serial device of monitoring system as shown in Fig. 5. RS485 serial communication method has a very high number of inverters due to its technical characteristics. In the field where multiple inverters are applied, the existing monitoring system can not be applied due to the limitation of the number of inverters.

On the other hand, the data collected in one inverter has a number of items as shown in FIG. 3, and in the field where multiple inverters are applied, the collection items increase exponentially.

Particularly, as multiple inverters are applied, a moving inverter (non-responsive inverter) and a non-active inverter (non-responsive inverter) are generated as shown in FIG. 6 depending on the external solar radiation environment. ) Will result in an error.

In addition, the application of multiple inverters increases the number of inverters to be managed and the amount of data to be collected, which causes operation and maintenance complexity rather than the application sites of individual inverters.

Open Patent No. 10-2015-0077889 (July 20, 2015).

Problems to be solved by the present invention are as follows.

That is, there is a limit in the number of physical connection of serial communication in the multi-inverter type solar power generation system, an increase in communication load due to an excessive number of variables, a total system error due to stoppage of some inverters, .

For this, the generation output is determined by the sum of the movable inverters, and the cumulative generation amount is determined by the sum of the received value of the movable inverter (response inverter) and the final stored value of the non-active inverter (non-responsive inverter) It is determined by the state data of the inverter composed of codes.

In addition, a standard node with a collecting, analyzing and transmitting function can be utilized by assigning a layer-by-layer identification code (communication ID).

Finally, a monitoring unit supporting the local management status window of the grouped multiple inverters is presented.

In order to solve the above problems,

A power converter (100) comprising a plurality of inverters (111) for converting a DC power from a solar module to an AC power; A data collecting unit 200 for serial communication with all the inverters of the power conversion unit 100, collecting electrical data for each inverter, sorting necessary data, analyzing the data, and collecting analyzed data for each inverter; And a monitor unit (300) for converting the data collected by the data collecting unit (200) into a form that can be output, and outputting the electrical data, wherein the electrical data includes a line voltage between three phases extracted from the power converted by the inverter (111) The power conversion unit 100 includes a plurality of inverter groups 110 that group the inverters 111 into a predetermined number of units and each inverter group 110 110) is provided with a unique identification code, and a unique identification code including an identification code of the inverter group (110) belonging to each inverter (111) is given thereto. The data collecting unit (200) A lower collecting unit 210 for performing serial communication with the inverter 111 of the inverter group 110 and an upper collecting unit 220 for communicating with each lower collecting unit 210 in series, Electrical data is collected for each inverter and The data is sorted and analyzed, the analyzed data is collected for each inverter, the collected data is collected by the upper collecting unit 220 for each lower collecting unit, and the necessary data is selected and analyzed. The lower collecting unit 210 includes an input communication unit 211 for serial communication with the inverter 111 and collecting the electrical data of each inverter together with the identification code of the corresponding inverter, A collection data processing section 213 for sorting the electric power generation amount, the cumulative generation amount and the state data required by the monitor section 300 in the electrical data for each inverter collected in the inverter 211 by the state data selected by the collection data processing section 213 The current situation determination unit 214 for determining which inverter is in the active state and which inverter is in the inactive state, and the collected data processing unit 213, And an output communication unit 212 for transmitting data stored in the database unit 215 in serial communication with the upper collecting unit 220, Is a data indicating the current operating state of the inverter, and shows the state of the inverter including the operation state of the inverter, the error, the replacement cycle alarm, and the communication failure in various code arrays. In the current state determination unit 214, It is possible to stop the operation of storing the data of the corresponding inverter selected by the collected data processing unit 213 in the database unit 215 and store only the data of the inverter in operation in real time, Is communicated in series with the lower collecting unit 210 to collect the data of each lower collecting unit together with the identification code of the inverter group to which the lower collecting unit belongs A collection data processing unit 223 for analyzing the lower collection unit data collected by the input communication unit 221 and the input communication unit 221 and a control unit 223 for controlling the generation output of the power conversion unit analyzed by the collection data processing unit 223, The current state determination unit 224 and the collected data processing unit 223 for determining whether the lower collecting unit and each inverter 111 are in normal operation or not using the star state data, together with the identification code of the corresponding inverter group And an output communication unit 222 for outputting the data stored in the database unit 225 to the monitor unit 300. The output communication unit 222 outputs the collected data per inverter Wherein the power generation output of the power conversion unit is the sum of the power generation amount of the inverter that is in the active state and the cumulative power generation amount of the power conversion unit is the inverter state (inactive / inactive) And if the current state determining unit 224 determines that the operation state of the specific lower collecting unit is abnormal, if the current state determining unit 224 determines that the operation state of the specific lower collecting unit is abnormal, And stops storing work data (power generation output and cumulative power generation amount) in the database unit 225. FIG.

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The present invention has the following effects.

In other words, it is possible to overcome the limit of the number of physical connection of the serial communication in the multiple inverter type solar power generation system, to reduce the communication load by selecting the variable items, to prevent the total sum error even when the inverter is stopped, It is advantageous in that the management of the system can be facilitated.

In addition, if the size of multiple inverters is small, it can be configured as a single data collection unit. If the size of multiple inverters is large, it can be configured as a data collection unit at various stages. Therefore, .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an overall configuration of a multi-inverter solar photovoltaic monitoring system according to the present invention; FIG.
2 is a block diagram showing the configuration of a lower collection unit or a higher collection unit;
3 is an illustration of an electrical data item collected in an inverter;
4 is a block diagram illustrating data selection at a lower collection unit;
5 is a conventional method for monitoring multiple inverters.
6 is an exemplary view showing the operation (response) state of the monitored inverter;
7 is an illustrative photograph of a monitor section;
8 is a flowchart showing a process of data selection and analysis in the data collecting unit of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. However, the scope of the present invention should be understood from the description of the claims. Further, the description of known technology which obscures the gist of the present invention is omitted.

The multi-inverter photovoltaic generation monitoring system of the present invention comprises a power conversion unit 100, a data collection unit 200, and a monitor unit 300, as shown in FIG.

The power conversion unit 100 includes a plurality of inverters 111 for converting the DC power from the photovoltaic power generation module into AC power. Specifically, the inverter 111 includes a plurality of inverter groups (110).

That is, as shown in FIG. 1, m inverter groups 110 each having n inverters as one unit can be constructed. In this case, the power converter 100 includes n × m inverters 111.

Each inverter group 110 is given a unique identification code. The identification code may be an ID or a serial number for identifying the inverter group 110, and in FIG. 1, serial numbers from 1 to m are given.

Each inverter 111 is given a unique identification code including an identification code of the inverter group 110 to which the inverter 111 belongs. An ID or a serial number for identifying the inverter 111 can also be designated by an identification code.

For example, in the case of the n-th inverter of the m-th group, a code of "m" is given to the inverter group 110 and a code of "m-n" is given to the n-th inverter.

This is an index for distinguishing which inverter 111 the data to be collected in the upper collecting unit 220 is.

The data collecting unit 200 performs serial communication with all the inverters of the power converting unit 100. The data collecting unit 200 collects electrical data for each inverter, selects necessary data, analyzes the data, and collects analyzed data for each inverter And includes a lower collecting unit 210 and an upper collecting unit 220 as shown in FIG.

The lower collecting unit 210 performs serial communication with the inverter 111 of each inverter group 110 and the upper collecting unit 220 communicates with each lower collecting unit 210 in series. Can be adopted. In this case, up to 32 inverters 111 can be connected to each lower collecting unit 210, so that the number of units of the inverter 111 constituting the inverter group 110 can be up to 32.

The maximum number of the inverters 111 connected to the data collecting unit 200 is 32 × 32 = 1,024 since the upper collecting unit 220 can also connect up to 32 lower collecting units 210.

2, the lower collecting unit 210 and the upper collecting unit 220 are connected to the input communication units 211 and 221, the output communication units 212 and 222, the collected data processing units 213 and 223, the current situation determination units 214 and 224, ).

The lower collecting unit 210 collects electrical data for each inverter, selects necessary data, analyzes the collected data, and collects analyzed data for each inverter. The detailed roles of the respective components are as follows.

The input communication unit 211 is in serial communication with the inverter 111 and collects the electrical data of each inverter together with the identification code of the corresponding inverter. 3, the electrical data includes a line voltage, a line current, a phase, a generated power, and a cumulative three-phase line voltage that can be extracted from the power converted by the inverter 111, Total generated power, state, and the like.

The collection data processing unit 213 serves to sort necessary data from the electrical data of each inverter collected by the input communication unit 211. [ That is, as shown in FIG. 4, only the data required by the monitor unit 300 is extracted from the electrical data that can be collected by the input communication unit 211. In order to monitor solar power generation, power generation, cumulative power generation, and status data are indispensable among the electrical data. In this case, the status data is data indicating the current operation state of the inverter and includes inverter operation information, error, Is represented by a plurality of code arrays. It is possible to judge whether or not the inverter is operated through this state data. The selected data is stored in the database unit 215 in real time.

The current situation determination unit 214 determines the current operation state of each inverter. The current state determination unit 214 determines whether the inverter is in the active state and in which the inverter is in the inactive state based on the state data selected by the collected data processing unit 213 . If it is determined that the specific inverter is in the inactive state, the collection data processing unit 213 stops the operation of storing the data of the selected inverter in the database unit 215.

The database unit 215 is a part in which the data selected by the collected data processing unit 213 is stored together with the identification code of the corresponding inverter. However, only the data of the inverter in operation is stored by the current situation determination unit 214 in real time.

The output communication unit 212 transmits the data stored in the database unit 215 to the upper collecting unit 220 and is also based on a serial communication method such as RS485.

The upper collecting unit 220 collects analyzed data for each lower collecting unit, selects necessary data, analyzes the collected data, and collects analyzed data for each lower collecting unit. same.

The input communication unit 221 is in serial communication with the lower collecting unit 210 and collects the data of each lower collecting unit together with the identification code of the inverter group to which the lower collecting unit belongs.

The collected data processing unit 223 analyzes the data collected by the input communication unit 221. At this time, the power generation output of the power conversion section 100 is calculated as the sum of the power generation amounts of the inverters in the active state, and the cumulative power generation amount of the power conversion section 100 is the power generation amount of the inverter Calculated as the sum of the last accumulated power generation. The analyzed data is stored in the database unit 225 in real time.

The current situation determination unit 224 determines the operation state of each lower collecting unit for each inverter 111. The present situation determination unit 224 determines the state of operation of each lower collecting unit based on the generation output of the power conversion unit analyzed by the collected data processing unit 223, Data can be used to determine whether the lower collecting unit and each inverter 111 are in normal operation. If it is determined that the operation state of the specific lower collecting unit is abnormal, the operation of storing the data (power generation output and accumulated power generation amount) of the lower collecting unit analyzed by the collected data processing unit 223 in the database unit 225 is stopped.

The database unit 225 stores the data analyzed by the collected data processing unit 223 together with the identification code of the corresponding inverter group and the output communication unit 222 transmits the data stored in the database unit 225 to the monitor unit 300. [ . In this case, the output communication unit 222 and the monitor unit 300 may be connected to a wide area network (WAN).

The monitor unit 300 provides a function of converting the data collected by the data collecting unit 200 into a form that can be outputted and outputting the collected data. In the display as shown in FIG. 7, the collected data and the inverter status (inactive / inactive) If the output is displayed, it is possible to monitor the status of solar power generation easily and to check whether the inverter is faulty.

A method for monitoring a solar panel of a multiple inverter according to the present invention is as follows (see FIG. 8).

(Single inverter group The power conversion unit  Occation)

Step 1: The power conversion unit, which is composed of a plurality of inverters, converts the DC power from the PV module to AC power, receives status data from each inverter, and determines whether each inverter is in operation.

If it is determined in the first step that the inverter is a movable inverter, the controller collects and collects the electric power, the cumulative electric power and the state data among the electric data of the inverter in real time, Stop collecting and storing electrical data.

Step 3: In the second step, the last stored power generation amount, cumulative generation amount and status data of each inverter are retrieved and transmitted to the monitoring unit.

(Multiple inverter groups The power conversion unit  Occation)

First, a plurality of inverters for converting a DC power from a solar power module into an AC power supply receives status data from each inverter in a power conversion unit including a plurality of inverter groups to determine whether each inverter is in operation.

Second step: If it is determined in the first step that the inverter is a movable inverter, the power generation amount, the cumulative power generation amount, and the status data among the electrical data of the inverter are selectively collected for each inverter group and are stored in real time. The inverter stops collecting and storing electrical data.

Step 3: The power generation amount, cumulative power generation amount, and status data for each inverter last stored in the second step are called up, and the power generation output of the power conversion unit and the cumulative power generation amount of the power conversion unit are analyzed.

Step 4: The analyzed data for each inverter group analyzed in the third step is transmitted to the monitoring unit.

In this case, the power generation output of the power conversion section 100 is calculated as the sum of the power generation amounts of the inverters in the active state, and the cumulative power generation amount of the power conversion section 100 is calculated as the final power of the inverter Is calculated as the sum of cumulative power generation amounts.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be clear to those who have knowledge.

100:
110: Inverter group
111: Inverter
200: Data collecting unit
210:
211: input communication section
212: output communication section
213: Collected data processor
214: Current situation judgment unit
215:
220:
221: input communication section
222:
223: Collected data processor
224: Current Situation Judgment Unit
225:
300:

Claims (7)

A power converter (100) comprising a plurality of inverters (111) for converting a DC power from a solar module to an AC power;
A data collecting unit 200 for serial communication with all the inverters of the power conversion unit 100, collecting electrical data for each inverter, sorting necessary data, analyzing the data, and collecting analyzed data for each inverter;
And a monitor unit (300) for converting the data collected by the data collecting unit (200) into an outputable form and outputting the converted data,

The electrical data
Phase line voltage, line current, phase, power generation amount, cumulative power generation amount, and operating state of three phases extracted from the power converted by the inverter 111,

The power conversion unit 100
And a plurality of inverter groups (110) grouped by dividing the inverters (111) into a predetermined number of units,

Each inverter group 110 is given a unique identification code,
Each inverter 111 is provided with a unique identification code including an identification code of the inverter group 110 to which it belongs,

The data collecting unit 200
A lower collecting unit 210 for serially communicating with the inverter 111 of each inverter group 110,
And an upper collecting unit 220 that communicates with each lower collecting unit 210 in serial,

In the lower collecting unit 210
Each inverter collects electrical data, selects necessary data, analyzes it, collects analyzed data for each inverter,
In the upper collecting unit 220
Collecting analyzed data for each subordinate collection unit, sorting necessary data, analyzing the collected data, and collecting analyzed data for each subordinate collection unit.

The lower collecting unit 210
An input communication unit 211 for serial communication with the inverter 111 to collect the electrical data of each inverter together with the identification code of the corresponding inverter,
A collection data processing unit 213 for selecting the electric power generation amount, the cumulative electric power generation amount, and the state data required by the monitor unit 300 from the electric data for each inverter collected by the input communication unit 211,
A current situation determination unit 214 for determining which inverter is in the active state and which is in the inactive state based on the state data selected by the collected data processing unit 213,
A database unit 215 for storing the selected data in the collected data processing unit 213 together with the identification code of the corresponding inverter,
And an output communication unit (212) for communicating with the upper collecting unit (220) in serial communication to transmit data stored in the database unit (215)

The state data is data indicating the present operating state of the inverter
The status of the inverter, including whether the inverter is running, an error, a replacement cycle alarm, or a communication fault,

If the current situation determination unit 214 determines that the specific inverter is in the inactive state
The collection data processing unit 213 stops the operation of storing the data of the selected inverter in the database unit 215,
Only the data of the inverter in operation is stored in real time,

The upper collecting unit 220
An input communication unit 221 for serial communication with the lower collecting unit 210 to collect data of each lower collecting unit together with an identification code of the inverter group to which the lower collecting unit belongs,
A collection data processing unit 223 for analyzing the collected lower-order part data collected by the input communication unit 221,
A current state determination unit 224 for determining whether the lower collecting unit and each inverter 111 are in normal operation using the power generation output of the power conversion unit, the cumulative power generation amount, and the state data for each inverter 111 analyzed by the collected data processing unit 223 ),
A database unit 225 for storing the data analyzed by the collected data processing unit 223 together with the identification code of the corresponding inverter group,
And an output communication unit (222) for transmitting the data stored in the database unit (225) to the monitor unit (300)

The output communication unit 222 outputs the collected data and the inverter status (inactive / inactive) for each inverter to the display,

Wherein the power generation output of the power conversion section is a sum of power generation amounts of the inverters in the active state,
Wherein the cumulative generation amount of the power conversion unit is the sum of the cumulative generation amount of the inverter in the active state and the final cumulative generation amount of the inverter in the inactive state,

If the current state determination unit 224 determines that the operation state of the specific lower collecting unit is abnormal
And stops the work of storing the data (power generation output and accumulated power generation amount) of the lower collecting unit analyzed by the collected data processing unit 223 in the database unit 225
Multiple inverter PV monitoring system.
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