A method, system and device for voltage adaptive control of a flexible voltage regulating device

Abstract

The present invention relates to the field of power quality management, specifically a method, system and equipment for adaptive voltage control of a flexible voltage regulating device, which includes the following steps: S1, setting the intercepted concentrator address CCO; S2, reading all intercepted carrier communication messages of the designated concentrator; S3, an edge computing gateway device parses the intercepted message to obtain the voltage data of all end users; S4, counting the maximum and minimum values ​​of the voltage of all end users; S5, performing voltage control according to the statistical maximum and minimum values ​​of the voltage. The present invention obtains the voltage data of all end users in the substation area through carrier sensing, and performs adaptive control, which can ensure that all terminal voltages are within a qualified range. By intercepting the carrier communication message between the concentrator and the end user's meter, the voltage data of all end users can be obtained, without the need to install any additional collection equipment at the user's end, and has the advantages of low implementation cost and easy implementation.

Description

Technical Field

[0001] The present invention relates to the technical field of power quality management, and in particular to a method, system and equipment for voltage adaptive control of a flexible voltage regulating device. Background Art

[0002] At present, my country's rural distribution network generally has problems such as long power supply lines, small wire diameters, large line losses, and seasonal load fluctuations, which have caused problems such as low voltage at the back end of the line. At the same time, as a large number of distributed photovoltaics in rural areas are connected to the distribution network, the grid voltage will also be high.

[0003] The flexible voltage regulator can monitor the grid voltage at its installation point in real time, and perform closed-loop voltage regulation in real time with the goal of ensuring that the grid voltage at the installation point is qualified, ensuring that the voltage at the installation point is within a safe range. However, the voltage at the installation point of the flexible voltage regulator often cannot truly reflect the voltage situation of the end user of the line. The current solution cannot achieve adaptive control based on the voltage of all end users, and cannot solve the problem of voltage exceeding the limit for all end users. Summary of the invention

[0004] The purpose of the present invention is to propose a method, system and device for adaptive voltage control of a flexible voltage regulator, in view of the fact that the solution based on voltage control at the installation point of the flexible voltage regulator in the background technology cannot solve the problem of voltage exceeding the limit for all end users.

[0005] In one aspect, the present invention provides a method, system and device for adaptively controlling voltage of a flexible voltage regulating device, comprising the following steps:

[0006] S1. Set the concentrator address CCO to be listened: After obtaining the address of the concentrator in the substation where the project is installed, send the address remotely to the edge computing gateway device through the cloud platform, and the edge computing gateway device sends the address to the carrier sensing device, thereby setting the concentrator address that the carrier sensing device needs to listen to;

[0007] S2. Read all the carrier communication messages of the designated concentrators that are intercepted: After completing S1, the carrier sensing device will send all the messages communicated between the concentrator specified by S1 and the end-user carrier meter to the edge computing gateway device, and the edge computing gateway device reads all the received carrier communication messages and stores them in the cache queue;

[0008] S3, the edge computing gateway device parses the intercepted message to obtain the voltage data of all end users;

[0009] S4, counting the maximum and minimum voltages of all end users;

[0010] S5. Perform voltage control according to the statistical maximum and minimum voltage values.

[0011] Preferably, in S3, the edge computing gateway device periodically reads the communication message from the cache queue for parsing, first identifies the type of communication protocol through the communication protocol characteristics, and then parses the message according to the specific protocol format of the identified protocol type to obtain the effective value of the three-phase voltage.

[0012] Preferably, in S4, after all end-user voltages are acquired, the edge computing gateway device first performs data cleaning to remove unreasonable abnormal data, and then performs extreme value statistics on the cleaned voltage data to count the maximum and minimum values ​​of all voltages.

[0013] Preferably, in S5, the edge computing gateway device compares the statistically obtained maximum voltage value with a preset voltage control threshold. max Greater than the voltage upper threshold U uplimit That is U max >U uplimit When the edge computing gateway device sends a voltage reduction control command to the flexible voltage regulating device, the control algorithm uses PI for closed-loop control, and the control target is U max <(U uplimit -U hyst ), the constraint condition is the minimum voltage U min Greater than the voltage lower limit threshold U downlimit That is U min >U downlimit , where U hyst is the hysteresis voltage, the default setting is 10; when the minimum voltage U min Less than the voltage lower limit threshold U downlimit That is U min <U downlimit When the edge computing gateway device sends a voltage increase control command to the flexible voltage regulating device, the control algorithm uses PI for closed-loop control, and the control target is U min >(U downlimit +U hyst ), the constraint condition is the maximum voltage U max Less than the upper voltage threshold U uplimit That is U max <U uplimit , where U hyst is the hysteresis voltage, and the default setting is 10; otherwise, the target voltage value of the voltage control command is maintained without changing the status quo.

[0014] On the other hand, the present invention proposes a system for voltage adaptive control of a flexible voltage regulating device, including six functional modules, namely a carrier sensing module, a carrier message receiving module, a carrier message parsing module, a voltage statistics module, a voltage control module and a voltage regulation module.

[0015] Preferably, the carrier sensing module is implemented in the carrier sensing device, the HPLC module of the carrier sensing device only receives the communication message on the power line, and does not send any message to the power line. After receiving the communication message on the power line, the carrier sensing module filters out the communication messages of all carrier meters that a specific concentrator is responsible for according to the set CCO address, and sends the communication messages of all carrier meters that the concentrator is responsible for to the carrier message receiving module; the carrier message receiving module is implemented in the edge computing gateway device, and is informed in real time that the serial port has received the data, and reads the data in the serial port receiving buffer, and stores the read data in the FIFO cache queue for use by the carrier message parsing module; the carrier message parsing module is implemented in the edge computing gateway device, and the carrier message parsing module periodically queries whether there is data in the cache queue. If there is data, the data in the cache queue is read for parsing, and the parsing process includes communication protocol recognition The voltage statistics module is implemented in the edge computing gateway device. The voltage statistics module periodically queries the value of the statistical tag. If the value of the statistical tag is 1, the maximum voltage calculation is performed; the voltage control module is implemented in the edge computing gateway device. The voltage control module calculates the current voltage control target value of the flexible voltage device through the PI control algorithm based on the maximum voltage of all end users and the set voltage regulation threshold, and sends the target value to the flexible voltage regulation device through the Ethernet interface of the edge computing gateway device; the voltage regulation module is implemented in the flexible voltage regulation device. After receiving the voltage control target value through the Ethernet interface of the flexible voltage regulation device, the voltage regulation module calculates the difference ΔU between the voltage control target value Uref and the grid voltage Ug at the installation point of the flexible voltage regulation device, and superimposes the ΔU value on the line through the series side inverter and series transformer of the flexible voltage regulation device, so as to finally achieve the regulation effect of the line voltage.

[0016] On the other hand, the present invention proposes a device for adaptively controlling the voltage of a flexible voltage regulating device, which is used to implement a system for adaptively controlling the voltage of a flexible voltage regulating device. The device includes a carrier sensing device, an edge computing gateway device and a flexible voltage regulating device; the carrier sensing device is used to implement the functions of the above-mentioned carrier sensing module, the edge computing gateway device is used to implement the functions of the above-mentioned carrier message receiving module, carrier message parsing module, voltage data statistics module and voltage control module, and the flexible voltage regulating device serves as the final actuator to implement the functions of the voltage regulation module.

[0017] Compared with the prior art, the present invention has the following beneficial technical effects: by acquiring the voltage data of all end users in the substation area through carrier sensing, and performing adaptive control based on the voltage data of all end users, it can ensure that all terminal voltages are within the qualified range. By listening to the carrier communication message between the existing concentrator and the end user meter in the current distribution network, the voltage data of all end users can be acquired, without the need to install any additional collection equipment at the user end and lay any communication lines, which has the advantages of low implementation cost and easy implementation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A flowchart of an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of a voltage adaptive control system and product of a flexible voltage regulating device proposed by the present invention;

[0020] Figure 3 A schematic diagram of a system for a specific implementation application of the present invention. DETAILED DESCRIPTION

[0021] Embodiment 1

[0022] like Figure 1 As shown, a method for voltage adaptive control of a flexible voltage regulating device proposed by the present invention comprises the following steps:

[0023] S1. Set the concentrator address CCO to be listened: After obtaining the address of the concentrator in the substation where the project is installed, send the address remotely to the edge computing gateway device through the cloud platform. The edge computing gateway device sends the address to the carrier sensing device through the serial port, thereby setting the concentrator address that the carrier sensing device needs to listen to;

[0024] S2. Read all the carrier communication messages of the designated concentrators that are intercepted: After completing S1, the carrier sensing device will send all the messages communicated between the concentrator specified by S1 and the end-user carrier meter to the edge computing gateway device through the serial port. The edge computing gateway device reads all the received carrier communication messages and stores them in the cache queue;

[0025] S3. The edge computing gateway device parses the intercepted message to obtain the voltage data of all end users; the edge computing gateway device periodically reads the communication message from the cache queue for parsing. The default period is 3s, which can be adjusted according to the actual situation. First, the type of communication protocol is identified through the communication protocol characteristics. The types of communication protocols mainly include but are not limited to DL / T645-1997, DL / T645-2007, DL / T376.2, DL / T698.45, etc. Then, according to the specific protocol format of the identified protocol type, the effective value of the three-phase voltage is parsed from the message;

[0026] S4. Count the maximum and minimum values ​​of all end-user voltages. After all end-user voltages are obtained, the edge computing gateway device first cleans the data to remove unreasonable abnormal data, and then performs maximum value statistics on the cleaned voltage data to count the maximum and minimum values ​​of all voltages.

[0027] S5. Perform voltage control based on the statistical maximum and minimum voltage values; the edge computing gateway device compares the statistical maximum voltage value with the pre-set voltage control threshold. max Greater than the voltage upper threshold U uplimit That is U max >U uplimit When the edge computing gateway device sends a voltage reduction control command to the flexible voltage regulating device, the control algorithm uses PI for closed-loop control, and the control target is U max <(U uplimit -U hyst ), the constraint condition is the minimum voltage U min Greater than the voltage lower limit threshold U downlimit That is U min >U downlimit , where U hyst is the hysteresis voltage, the default setting is 10; when the minimum voltage U min Less than the voltage lower limit threshold U downlimit That is U min <U downlimit When the edge computing gateway device sends a voltage increase control command to the flexible voltage regulating device, the control algorithm uses PI for closed-loop control, and the control target is U min >(U downlimit +U hyst ), the constraint condition is the maximum voltage U max Less than the upper voltage threshold U uplimit That is U max <U uplimit , where U hyst is the hysteresis voltage, and the default setting is 10; otherwise, the target voltage value of the voltage control command is maintained without changing the status quo.

[0028] Embodiment 2

[0029] like Figure 2 As shown, a system for voltage adaptive control of a flexible voltage regulating device proposed in the present invention includes six functional modules, namely a carrier sensing module, a carrier message receiving module, a carrier message parsing module, a voltage statistics module, a voltage control module and a voltage regulation module.

[0030] Furthermore, the carrier sensing module is implemented in the carrier sensing device. The HPLC module of the carrier sensing device only receives communication messages on the power line, but does not send any messages to the power line, thereby realizing non-sensing listening, which does not affect the original electricity consumption information collection network at all. After receiving the communication message on the power line, the carrier sensing module filters out the communication messages of all carrier meters that a specific concentrator is responsible for according to the set CCO address, and sends the communication messages of all carrier meters that the concentrator is responsible for to the carrier message receiving module through the RS485 serial port of the carrier sensing device; the carrier message receiving module is implemented in the edge computing gateway device, and the serial port interrupt of the edge computing gateway device is used to obtain the data received by the serial port in real time, and read the data in the serial port receiving buffer, and store the read data in the FIFO cache queue for use by the carrier message parsing module; the carrier message parsing module is implemented in the edge computing gateway device, and the carrier message parsing module periodically queries whether there is data in the cache queue. If If there is data in the read cache queue, it is parsed, and the parsing process includes communication protocol identification and voltage data parsing; the voltage statistics module is implemented in the edge computing gateway device, and the voltage statistics module periodically queries the value of the statistical tag. If the value of the statistical tag is 1, the maximum voltage calculation is performed; the voltage control module is implemented in the edge computing gateway device, and the voltage control module calculates the current voltage control target value of the flexible voltage device through the PI control algorithm based on the maximum voltage of all end users and the set voltage regulation threshold, and sends the target value to the flexible voltage regulation device through the Ethernet interface of the edge computing gateway device; the voltage regulation module is implemented in the flexible voltage regulation device, and after receiving the voltage control target value through the Ethernet interface of the flexible voltage regulation device, the voltage regulation module calculates the difference ΔU between the voltage control target value Uref and the grid voltage Ug at the installation point of the flexible voltage regulation device, and superimposes the ΔU value on the line through the series side inverter and series transformer of the flexible voltage regulation device, so as to finally achieve the regulation effect of the line voltage.

[0031] Furthermore, the specific working process of the carrier message parsing module is as follows:

[0032] Step 1: Identify the communication protocol type of the carrier message according to the communication protocol characteristics. The types of communication protocols mainly include but are not limited to DL / T645-1997, DL / T645-2007, DL / T376.2, DL / T698.45, etc.

[0033] Step 2: According to the identified protocol type, search for the voltage data message, locate the position of the voltage data in the message, extract the voltage data and calculate the effective value of the voltage according to the data type specified by the protocol.

[0034] Furthermore, the specific working process of the voltage data statistics module is as follows:

[0035] Step 1: Clean the voltage data and extract a voltage value U rms , if U rms If the value of is within the normal and reasonable range, then U rms Include the maximum value in the calculation; otherwise, eliminate the voltage value and continue to take the next voltage value until a valid voltage value is obtained.

[0036] Step 2: Calculate the maximum value. When calculating for the first time, directly use the voltage value U rms Assign a value to the maximum voltage U max and voltage minimum value U min ; Otherwise, the voltage value U that will be involved in the calculation rms With the maximum value U max and the minimum value U min For comparison, if U rms >U max , then the voltage value U rms Assign a value to the maximum voltage U max , if U rms min , then the voltage value U rms Assign the voltage minimum value U min .

[0037] Step 3: Repeat steps 1 and 2 until all voltages are included in the statistical calculation and finally get U max and U min .

[0038] Furthermore, the voltage control module voltage regulation control start condition is that the voltage exceeds the upper limit U max >U uplimit Or the voltage exceeds the lower limit U min downlimit The control target of voltage exceeding the upper limit is U max <(U uplimit -U hyst ), the constraint is U min >U downlimit The control target of the voltage lower limit is U min >(U downlimit +U hyst ), the constraint is U max uplimit .

[0039] Embodiment 3

[0040] like Figure 3 ​​​As shown, a device for adaptive voltage control of a flexible voltage regulating device proposed in the present invention is used to implement a system for adaptive voltage control of the above-mentioned flexible voltage regulating device, and the device includes a carrier sensing device, an edge computing gateway device and a flexible voltage regulating device; the carrier sensing device is used to implement the functions of the above-mentioned carrier sensing module, the edge computing gateway device is used to implement the functions of the above-mentioned carrier message receiving module, the carrier message parsing module, the voltage data statistics module and the voltage control module, and the flexible voltage regulating device serves as the final actuator to implement the functions of the voltage regulation module.

[0041] In summary, the present invention obtains the voltage data of all end users in the substation area through carrier sensing, and performs adaptive control based on the voltage data of all end users, so as to ensure that all terminal voltages are within the qualified range. By listening to the carrier communication message between the existing concentrator and the end user meter in the current distribution network, the voltage data of all end users can be obtained, without the need to install any additional collection equipment at the user end and lay any communication lines, which has the advantages of low implementation cost and easy implementation.

[0042] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A method for voltage adaptive control of a flexible voltage regulating device, characterized in that: The following steps are involved: S1. Set the concentrator address CCO to be listened: After obtaining the address of the concentrator in the substation where the project is installed, send the address remotely to the edge computing gateway device through the cloud platform, and the edge computing gateway device sends the address to the carrier sensing device, thereby setting the concentrator address that the carrier sensing device needs to listen to; S2. Read all the carrier communication messages of the designated concentrators that are intercepted: After completing S1, the carrier sensing device will send all the messages communicated between the concentrator specified by S1 and the end-user carrier meter to the edge computing gateway device, and the edge computing gateway device reads all the received carrier communication messages and stores them in the cache queue; S3, the edge computing gateway device parses the intercepted message to obtain the voltage data of all end users; S4, counting the maximum and minimum voltages of all end users; S5. Perform voltage control according to the statistical maximum and minimum voltage values.

2. The method for voltage adaptive control of a flexible voltage regulating device according to claim 1, characterized in that: In S3, the edge computing gateway device periodically reads the communication message from the cache queue for parsing. First, the type of communication protocol is identified through the communication protocol characteristics, and then the effective value of the three-phase voltage is parsed from the message according to the specific protocol format of the identified protocol type.

3. The method for voltage adaptive control of a flexible voltage regulating device according to claim 1, characterized in that: In S4, after all end-user voltages are obtained, the edge computing gateway device first performs data cleaning to remove unreasonable abnormal data, and then performs extreme value statistics on the cleaned voltage data to count the maximum and minimum values ​​of all voltages.

4. The method for voltage adaptive control of a flexible voltage regulating device according to claim 1, characterized in that: In S5, the edge computing gateway device compares the statistical maximum voltage value with the preset voltage control threshold. max Greater than the voltage upper threshold U uplimit That is U max >U uplimit When the edge computing gateway device sends a voltage reduction control command to the flexible voltage regulating device, the control algorithm uses PI for closed-loop control, and the control target is U max <(U uplimit -U hyst ), the constraint condition is the minimum voltage U min Greater than the voltage lower limit threshold U downlimit That is U min >U downlimit , where U hyst is the hysteresis voltage, the default setting is 10; when the minimum voltage U min Less than the voltage lower limit threshold U downlimit That is U min <U downlimit When the edge computing gateway device sends a voltage increase control command to the flexible voltage regulating device, the control algorithm uses PI for closed-loop control, and the control target is U min >(U downlimit +U hyst ), the constraint condition is the maximum voltage U max Less than the voltage upper threshold U uplimit That is U max <U uplimit , where U hyst is the hysteresis voltage, and the default setting is 10; otherwise, the target voltage value of the voltage control command is maintained without changing the status quo.

5. A system for voltage adaptive control of a flexible voltage regulating device, characterized in that: It includes six functional modules, namely, a carrier sensing module, a carrier message receiving module, a carrier message parsing module, a voltage statistics module, a voltage control module and a voltage regulation module.

6. The system for voltage adaptive control of a flexible voltage regulating device according to claim 5, characterized in that: The carrier sense module is implemented in the carrier sense device. The HPLC module of the carrier sense device only receives the communication messages on the power line, but does not send any messages to the power line. After receiving the communication messages on the power line, the carrier sense module filters out the communication messages of all carrier meters that a specific concentrator is responsible for according to the set CCO address, and sends the communication messages of all carrier meters that the concentrator is responsible for to the carrier message receiving module; The carrier message receiving module is implemented in the edge computing gateway device, which is aware of the data received by the serial port in real time, reads the data in the serial port receiving buffer, and stores the read data in the FIFO cache queue for use by the carrier message parsing module; the carrier message parsing module is implemented in the edge computing gateway device, and the carrier message parsing module periodically queries whether there is data in the cache queue. If there is data, the data in the cache queue is read for parsing. The parsing process includes communication protocol identification and voltage data parsing; the voltage statistics module is implemented in the edge computing gateway device, and the voltage statistics module periodically queries the value of the statistical mark. If the value of the statistical mark is 1, the maximum value of the voltage is calculated; the voltage control module is The voltage control module is implemented in the edge computing gateway device. The voltage control module calculates the current voltage control target value of the flexible voltage device through the PI control algorithm based on the voltage maximum value of all end users and the set voltage regulation threshold, and sends the target value to the flexible voltage regulation device through the Ethernet interface of the edge computing gateway device; the voltage regulation module is implemented in the flexible voltage regulation device. After receiving the voltage control target value through the Ethernet interface of the flexible voltage regulation device, the voltage regulation module calculates the difference ΔU between the voltage control target value Uref and the grid voltage Ug at the installation point of the flexible voltage regulation device, and superimposes the ΔU value on the line through the series side inverter and series transformer of the flexible voltage regulation device, so as to finally achieve the regulation effect of the line voltage.

7. A device for adaptive voltage control of a flexible voltage regulator, used to implement the system for adaptive voltage control of a flexible voltage regulator according to claim 6, characterized in that: The device includes a carrier sensing device, an edge computing gateway device and a flexible voltage regulating device; the carrier sensing device is used to realize the functions of the above-mentioned carrier sensing module, the edge computing gateway device is used to realize the functions of the above-mentioned carrier message receiving module, carrier message parsing module, voltage data statistics module and voltage control module, and the flexible voltage regulating device is used as the final actuator to realize the function of the voltage regulation module.

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