A collaborative control method and device suitable for station area voltage control

Abstract

The present invention provides a collaborative control method and device suitable for substation voltage control, the method comprising: obtaining all regulating devices and corresponding collaborative control terminals in the substation; wherein the regulating devices include reactive regulating devices and voltage regulating devices; the collaborative control terminal corresponding to the reactive regulating device is the first control terminal; the collaborative control terminal corresponding to the voltage regulating device is the second control terminal; numbering each collaborative control terminal according to the corresponding node voltage array; controlling the collaborative control terminal according to the power factor value and the voltage value, combined with preset parameters, until the preset conditions are met. Compared with the prior art, the collaborative control terminal is divided into a first control terminal and a second control terminal, and according to the power factor value of the first control terminal and the voltage value of the second control terminal, coordinated control based on the substation is achieved without major upgrades to the power grid, thereby improving the reliability and stability of the power grid.

Description

Technical Field

[0001] The present invention relates to the field of reactive voltage control in distribution networks, and in particular to a coordinated control method and device suitable for voltage control in distribution networks. Background Art

[0002] As the power system's requirements for power supply reliability gradually increase, the 0.4kV power network, as the "last mile" of power transmission, also has higher power supply reliability requirements. However, the last nodes with control equipment in the current power system are all 10kV distribution transformers, and most of the 0.4kV lines derived from the distribution transformers do not have active control equipment. Without large-scale upgrades and renovations, it is obviously impossible to meet the increasing power supply reliability needs. In addition, with the construction of new power systems, the access of new loads and distributed power sources will inevitably increase gradually, affecting the reliability of power supply to the power grid. Summary of the invention

[0003] The present invention provides a collaborative control method and device suitable for substation voltage control, which can realize active control of the power grid based on the substation without major upgrading and reconstruction of the power grid, thereby improving the reliability and stability of the power supply of the power grid.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a coordinated control method applicable to substation voltage control, including:

[0005] Acquire all regulating devices in the substation area and the cooperative control terminals corresponding to each regulating device; wherein the regulating devices include reactive power regulating devices and voltage regulating devices; the cooperative control terminal corresponding to the reactive power regulating device is the first control terminal; and the cooperative control terminal corresponding to the voltage regulating device is the second control terminal;

[0006] According to the voltage arrays of the nodes corresponding to the cooperative control terminals within the first preset time range, the cooperative control terminals are numbered from 1 in descending order of the minimum voltage values ​​in the voltage arrays; wherein each voltage array corresponds to each cooperative control terminal one by one;

[0007] Controlling all cooperative control terminals according to power factor values ​​of nodes corresponding to all first control terminals at the current moment, in combination with a preset first threshold and the number of the cooperative control terminal;

[0008] When the power factor requirements of all first control terminals are met, all collaborative control terminals are controlled according to the voltage values ​​of the nodes corresponding to all second control terminals at the current moment, combined with the preset voltage threshold range and the number of the collaborative control terminal, until the voltage value requirements of the nodes corresponding to all second control terminals are met.

[0009] As a preferred solution, the control of all cooperative control terminals is performed according to the power factor values ​​of the nodes corresponding to all first control terminals at the current moment, combined with the preset first threshold and the number of the cooperative control terminal, specifically:

[0010] Obtain power factor values ​​of nodes corresponding to all first control terminals at the current moment; when there is at least one first control terminal whose power factor is less than a first threshold, repeat the following first control operation on all collaborative control terminals until there is no first control terminal whose power factor is less than the first threshold:

[0011] The control authority of all cooperative control terminals other than the one with the largest number is locked for a second preset time, and the power factor value of the node corresponding to the cooperative control terminal with the largest number is adjusted to be greater than or equal to the first threshold.

[0012] As a preferred solution, the obtaining of the power factor values ​​of the nodes corresponding to all the first control terminals at the current moment is specifically as follows:

[0013] The voltage value and current value of the node corresponding to each first control terminal at the current moment are obtained, and a voltage array and a current array are constructed respectively, and then the power factor value of the node corresponding to each first control terminal is calculated.

[0014] As a preferred solution, all cooperative control terminals are controlled according to the voltage values ​​of the nodes corresponding to all second control terminals at the current moment, in combination with the preset voltage threshold range and the number of the cooperative control terminal, specifically:

[0015] Obtain the voltage values ​​corresponding to all second control terminals at the current moment. When there is at least one second control terminal corresponding to a node whose voltage value is within a preset voltage threshold range, repeat the following second control operation on all cooperative control terminals until there is no second control terminal corresponding to a node whose voltage value is within the preset voltage threshold range:

[0016] The control authority of all cooperative control terminals other than the one with the smallest number is locked for a third preset time, and the voltage of the node corresponding to the cooperative control terminal with the smallest number is adjusted until it is outside the preset voltage threshold range.

[0017] As a preferred solution, before sequentially numbering the cooperative control terminals starting from 1, the method further includes:

[0018] Set the cooperative control terminal closest to the substation as the master terminal, and the other cooperative control terminals as slave terminals;

[0019] The master terminal is controlled to communicate with all slave terminals three times respectively, and the total number of cooperatively controlled terminals is updated according to the results of the three communications.

[0020] As a preferred solution, the controlling the master terminal to communicate with all slave terminals three times respectively is as follows:

[0021] Controlling the master terminal to communicate with all slave terminals three times respectively through a broadband carrier;

[0022] Alternatively, the master terminal is controlled to communicate with all slave terminals three times respectively through micro-power wireless.

[0023] As a preferred solution, the collaborative control terminal includes a sampling measurement module, a broadband carrier module, a micro-power wireless module, a control judgment module and a control output module; wherein,

[0024] The sampling and measuring module is used to obtain voltage and current, and calculate the corresponding power factor, active power and reactive power;

[0025] The broadband carrier module and the micro-power wireless module are used to communicate with other collaborative control terminals;

[0026] The control judgment module is used to judge whether the preset judgment condition is met;

[0027] The control output module is used to respond to action instructions and control corresponding regulating equipment.

[0028] Accordingly, an embodiment of the present invention further provides a collaborative control device suitable for substation voltage control, comprising an acquisition module, a numbering module, a first control module and a second control module; wherein,

[0029] The acquisition module is used to acquire all the regulating devices in the substation and the cooperative control terminals corresponding to each regulating device; wherein the regulating devices include reactive power regulating devices and voltage regulating devices; the cooperative control terminal corresponding to the reactive power regulating device is the first control terminal; and the cooperative control terminal corresponding to the voltage regulating device is the second control terminal;

[0030] The numbering module is used to number each collaborative control terminal from 1 in sequence according to the voltage arrays of the nodes corresponding to each collaborative control terminal within the first preset time range and in the order of the minimum voltage values ​​in each voltage array from large to small; wherein each voltage array corresponds to each collaborative control terminal one by one;

[0031] The first control module is used to control all cooperative control terminals according to the power factor values ​​of the nodes corresponding to all the first control terminals at the current moment, in combination with the preset first threshold and the number of the cooperative control terminal;

[0032] When the power factor requirements of all first control terminals are met, the second control module is used to control all collaborative control terminals according to the voltage values ​​of the nodes corresponding to all second control terminals at the current moment, combined with the preset voltage threshold range and the number of the collaborative control terminal, until the voltage value requirements of the nodes corresponding to all second control terminals are met.

[0033] As a preferred solution, the first control module controls all cooperative control terminals according to the power factor values ​​of the nodes corresponding to all first control terminals at the current moment, combined with the preset first threshold and the number of the cooperative control terminal, specifically:

[0034] The first control module obtains power factor values ​​of nodes corresponding to all first control terminals at the current moment; when there is at least one first control terminal whose power factor is less than a first threshold, repeatedly performs the following first control operation on all collaborative control terminals until there is no first control terminal whose power factor is less than the first threshold:

[0035] The control authority of all cooperative control terminals other than the one with the largest number is locked for a second preset time, and the power factor value of the node corresponding to the cooperative control terminal with the largest number is adjusted to be greater than or equal to the first threshold.

[0036] As a preferred solution, the second control module controls all cooperative control terminals according to the voltage values ​​of the nodes corresponding to all second control terminals at the current moment, combined with the preset voltage threshold range and the number of the cooperative control terminal, specifically:

[0037] The second control module obtains the voltage values ​​corresponding to all the second control terminals at the current moment, and when there is a voltage value of a node corresponding to at least one second control terminal within a preset voltage threshold range, repeatedly performs the following second control operation on all the collaborative control terminals until there is no voltage value of a node corresponding to the second control terminal within the preset voltage threshold range:

[0038] The control authority of all cooperative control terminals other than the one with the smallest number is locked for a third preset time, and the voltage of the node corresponding to the cooperative control terminal with the smallest number is adjusted until it is outside the preset voltage threshold range.

[0039] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0040] The embodiment of the present invention provides a collaborative control method and device suitable for substation voltage control, the method comprising: obtaining all regulating devices in the substation and the collaborative control terminals corresponding to each regulating device; wherein the regulating device comprises a reactive regulating device and a voltage regulating device; the collaborative control terminal corresponding to the reactive regulating device is a first control terminal; the collaborative control terminal corresponding to the voltage regulating device is a second control terminal; according to the voltage array of the node corresponding to each collaborative control terminal within the first preset time range, in the order of the minimum voltage value in each voltage array from large to small, the collaborative control terminals are numbered from 1 in sequence; wherein each voltage array corresponds to each collaborative control terminal one by one; according to the power factor value of the node corresponding to all the first control terminals at the current moment, combined with the preset first threshold value and the number of the collaborative control terminal, all the collaborative control terminals are controlled; when the power factor requirements of all the first control terminals are met, according to the voltage value of the node corresponding to all the second control terminals at the current moment, combined with the preset voltage threshold range and the number of the collaborative control terminal, all the collaborative control terminals are controlled until the voltage value requirements of the nodes corresponding to all the second control terminals are met. Compared with the existing technology, the collaborative control terminals are divided into power factor control terminals (first control terminals) and voltage control terminals (second control terminals), and the collaborative control terminals are numbered according to the voltage array of the nodes within the first preset time range. According to the power factor value of the first control terminal and the voltage value of the second control terminal, coordinated control based on substations is achieved without major upgrades to the power grid, thereby improving the reliability and stability of the power grid.

[0041] Furthermore, the coordination and cooperation of the actions of various regulating devices can be achieved through communication networking between the master terminal and the slave terminal. For substations with reactive power or voltage problems, the reactive power problems and voltage problems can be solved separately from the end, further reducing the amount of transformation brought about by the growth of electricity demand.

[0042] Furthermore, it is suitable for situations where there are multiple regulating devices in the substation. The regulating devices can be identified based on the distance between them, which reduces the degree of manual intervention to a certain extent and can solve reactive power problems and voltage problems in stages.

[0043] Furthermore, by controlling the time difference and locking the control authority, the mutual coupling between reactive power and voltage leading to effect fluctuations and frequent actions can be avoided, which can effectively improve the coordinated effect of substation voltage control. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 : A flow chart of an embodiment of a collaborative control method for substation voltage control provided by the present invention.

[0045] Figure 2: A structural diagram of an embodiment of the collaborative control terminal provided by the present invention.

[0046] Figure 3 : A schematic diagram of the installation of the table area adjustment equipment according to an embodiment of the present invention.

[0047] Figure 4 : A structural schematic diagram of an embodiment of a collaborative control device suitable for substation voltage control provided by the present invention. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0049] Embodiment one:

[0050] Please refer to Figure 1 , Figure 1 A coordinated control method for area voltage control provided in an embodiment of the present invention includes steps S1 to S4, wherein:

[0051] Step S1, obtain all regulating devices in the substation and the collaborative control terminal corresponding to each regulating device; wherein the regulating device (or control device) includes a reactive regulating device and a voltage regulating device; the collaborative control terminal corresponding to the reactive regulating device is the first control terminal; the collaborative control terminal corresponding to the voltage regulating device is the second control terminal.

[0052] In this embodiment, all the regulating devices in the substation and the cooperative control terminals corresponding to each regulating device are obtained. The regulating devices can be obtained by inputting. Moreover, each regulating device corresponds to at least one cooperative control terminal.

[0053] The regulating device can be divided into a reactive regulating device and a voltage regulating device according to its function, wherein the cooperative control terminal corresponding to the reactive regulating device is the first control terminal; and the cooperative control terminal corresponding to the voltage regulating device is the second control terminal. In addition, the control mode of the cooperative control terminal of the reactive regulating device, i.e., the first control terminal, is set to the reactive control mode, and the control mode of the cooperative control terminal of the voltage regulating device, i.e., the second control terminal, is set to the voltage control mode.

[0054] The reactive power control mode is specifically: controlling the action output of the reactive power regulation device according to the operating conditions of the reactive power or the power factor, so that the reactive power or the power factor meets the set target requirements.

[0055] The voltage control mode is specifically: controlling the action gear of the voltage regulating device according to the operating conditions of the voltage amplitude, so that the voltage amplitude meets the set target requirements.

[0056] Furthermore, before step S2, the collaborative control method further includes: setting the collaborative control terminal closest to the station area as a master terminal, and the remaining collaborative control terminals as slave terminals;

[0057] The master terminal is controlled to communicate with all slave terminals three times respectively, and the total number of cooperatively controlled terminals is updated according to the results of the three communications.

[0058] Preferably, the communication method adopts broadband carrier or micro-power wireless. Through broadband carrier, the master terminal is controlled to communicate with all slave terminals three times respectively; or through micro-power wireless, the master terminal is controlled to communicate with all slave terminals three times respectively.

[0059] The number of slave terminals that successfully communicated three times is recorded, and the number of slave terminals that successfully communicated is updated to the total number of cooperative control terminals n. In addition, the slave terminals that did not successfully communicate three times are offline operated and marked as events.

[0060] Step S2, according to the voltage array of the node corresponding to each collaborative control terminal within the first preset time range, number each collaborative control terminal in sequence from 1 in descending order of the minimum voltage value in each voltage array; wherein each voltage array corresponds to each collaborative control terminal one by one.

[0061] In this embodiment, the voltage data of all cooperative control terminals (corresponding to the total number of n cooperative control terminals after the above update) from the current time to the previous three days are collected, and the data is collected every 15 minutes, so as to obtain the voltage array (U h ). Each voltage array corresponds to each cooperative control terminal one by one.

[0062] Count the minimum voltage value (U) of each node corresponding to each collaborative control terminal in the past three days mini ), press U mini Each cooperative control terminal is numbered from 1 to n in descending order.

[0063] Step S3: Control all cooperative control terminals according to the power factor values ​​of the nodes corresponding to all first control terminals at the current moment, in combination with a preset first threshold and the number of the cooperative control terminal.

[0064] In this embodiment, power factor values ​​of nodes corresponding to all first control terminals at the current moment are obtained; when there is at least one first control terminal whose corresponding power factor is less than the first threshold, the following first control operation is repeatedly performed on all collaborative control terminals until there is no first control terminal whose corresponding power factor is less than the first threshold:

[0065] The control authority of all cooperative control terminals other than the largest number is locked for a second preset time, and the power factor value of the node corresponding to the cooperative control terminal with the largest number is adjusted to be greater than or equal to the first threshold. It should be noted that, as an example of this embodiment, obtaining the power factor values ​​of all nodes corresponding to the first control terminals at the current moment means monitoring the power factor values ​​of the nodes corresponding to the first control terminals in real time. When there is at least one first control terminal whose power factor is less than the first threshold, the above-mentioned first control operation is performed on all cooperative control terminals; after each execution of the first control operation, it is re-judged whether the condition of "there is at least one first control terminal whose power factor is less than the first threshold" is met. If it is met, the first control operation is re-executed until there is no first control terminal whose power factor is less than the first threshold. As another example of this embodiment, after each execution of the first control operation, the power factor values ​​of all nodes corresponding to the first control terminals at the current moment can be recalculated and obtained, and then it is determined whether there is at least one first control terminal whose power factor is less than the first threshold. If it is met, the first control operation is continued for the second, third...nth time until there is no first control terminal whose power factor is less than the first threshold.

[0066] The first threshold is preferably 0.93, the second preset time is 60 seconds, and the power factor values ​​of all nodes corresponding to the first control terminals at the current moment are preferably obtained as follows:

[0067] Get the voltage value (U) of each node corresponding to the first control terminal at the current moment i ) and current value (I i ), where the total number of nodes is i, and a voltage array and a current array are constructed respectively, and then the power factor value of each node corresponding to each first control terminal is calculated.

[0068] Step S4, when the power factor requirements of all first control terminals are met, all collaborative control terminals are controlled according to the voltage values ​​of the nodes corresponding to all second control terminals at the current moment, combined with the preset voltage threshold range and the number of the collaborative control terminal, until the voltage value requirements of the nodes corresponding to all second control terminals are met.

[0069] In this embodiment, when the power factors of all first control terminals are greater than or equal to the first threshold value (0.93), the voltage values ​​corresponding to all second control terminals at the current moment are obtained, and when there is at least one second control terminal corresponding to a node whose voltage value is within the preset voltage threshold range, the following second control operation is repeatedly performed on all cooperative control terminals until there is no second control terminal corresponding to a node whose voltage value is within the preset voltage threshold range:

[0070] The control authority of all cooperative control terminals other than the one with the smallest number is locked for a third preset time, and the voltage of the node corresponding to the cooperative control terminal with the smallest number is adjusted until it is outside the preset voltage threshold range.

[0071] The preset threshold range includes a range less than 342 V and greater than 406 V. The third preset time may be the same as or different from the second preset time, and is preferably 60 s in this embodiment.

[0072] It should be noted that, as an example of this embodiment, obtaining the voltage values ​​corresponding to all second control terminals at the current moment means monitoring the voltage corresponding to the second control terminal in real time. When there is at least one second control terminal corresponding to a voltage within the preset voltage range, the above-mentioned second control operation is performed on all cooperative control terminals; after each execution of the second control operation, it is re-determined whether the condition of "there is at least one second control terminal corresponding to a node whose voltage value is within the preset voltage threshold range" is met. If it is met, the second control operation is re-executed until there is no second control terminal corresponding to a voltage within the preset voltage threshold range. As another example of this embodiment, it is also possible to re-acquire the voltages of all second control terminal corresponding nodes at the current moment after each execution of the second control operation, and then determine whether there is at least one second control terminal corresponding to a voltage within the preset voltage threshold range. If it is met, the second control operation is continued for the second, third, ... nth time until there is no second control terminal corresponding to a node whose voltage value is within the preset voltage threshold range.

[0073] As a preferred solution, refer to Figure 2 The collaborative control terminal includes a sampling measurement module, a broadband carrier module, a micro-power wireless module, a control judgment module and a control output module; wherein,

[0074] The sampling and measuring module is used to obtain voltage and current, and calculate the corresponding power factor, active power and reactive power;

[0075] The broadband carrier module and the micro-power wireless module are used to communicate with other collaborative control terminals;

[0076] The control judgment module is used to judge whether the preset judgment condition is met;

[0077] The control output module is used to respond to action instructions and control corresponding regulating equipment.

[0078] The following takes the active monitoring and control of a certain area at 15:00 on June 2, 2022 as an example to further illustrate the technical solution of this embodiment:

[0079] The grid structure of this area refers to Figure 3 , and all relevant data of the substation have been entered into the system. From the data in the system, it can be seen that there are a total of 17 regulating devices in this substation, including 10 voltage regulating devices and 7 power factor regulating devices. And all regulating devices have been installed with collaborative control terminals.

[0080] According to the distance from the distribution transformer, the regulating equipment is numbered from 1 to 17. The numbering results refer to Figure 1 The cooperative control terminal supporting the reactive power regulation device is defined as the first control terminal, the cooperative control terminal supporting the voltage regulation device is defined as the second control terminal, the cooperative control terminal supporting the voltage regulation device with device number 1 is set as the master terminal, and the other cooperative control terminals are slave terminals.

[0081] Table 1 Regulation equipment number table

[0082]

[0083] The master terminal communicated with the slave terminal at 15:03, 15:06, and 15:09 respectively. The communication results showed that the power factor control terminal of the regulating device No. 11 only achieved one communication at 15:06, and no communication was achieved at the other two times. Therefore, the power factor control terminal of device No. 11 was offline, and an event reporting system was formed, and the total number of collaborative control terminals was updated to 16.

[0084] The voltage values ​​of the nodes corresponding to the remaining 16 collaborative control terminals at intervals of 15 minutes in the past three days were counted and compared, and the minimum voltage value of each node was obtained as shown in Table 2.

[0085] Table 2 Statistics of minimum voltage of nodes corresponding to each coordinated control terminal

[0086]

[0087] According to the minimum voltage value of the corresponding node of each cooperative control terminal, each cooperative control terminal is renumbered according to the following: the minimum voltage value is from high to low, and the number is from 1 to 16. Table 3 can be obtained:

[0088] Table 3 Statistics of minimum voltage of nodes corresponding to each coordinated control terminal

[0089]

[0090]

[0091] Collect the power factors of the nodes corresponding to each first control terminal (power factor control terminal), refer to Table 4:

[0092] Table 4 Power factor statistics of the first control terminal (power factor control terminal)

[0093] Terminal Number Terminal Type Corresponding node power factor Is it beyond the limit? 2 Power factor control terminal 0.96 no 4 Power factor control terminal 0.96 no 7 Power factor control terminal 0.95 no 10 Power factor control terminal 0.95 no 12 Power factor control terminal 0.93 no 16 Power factor control terminal 0.9 yes

[0094] It can be seen from Table 4 that only the node corresponding to the No. 16 power factor control terminal has a power factor exceeding the limit. Therefore, the control authority of all cooperative control terminals except the No. 16 power factor control terminal is locked, and the reactive power regulation equipment of the node corresponding to the No. 16 power factor control terminal is adjusted to adjust the power factor of the node corresponding to the No. 16 power factor control terminal to 0.94.

[0095] After locking all cooperative control terminals for 60 seconds, collect the power factors of the nodes corresponding to each power factor control terminal, refer to Table 5:

[0096] Table 5 Power factor statistics of the first control terminal (power factor control terminal) after adjustment

[0097] Terminal Number Terminal Type Corresponding node power factor Is it beyond the limit? 2 Power factor control terminal 0.96 no 4 Power factor control terminal 0.96 no 7 Power factor control terminal 0.95 no 10 Power factor control terminal 0.95 no 12 Power factor control terminal 0.94 no 16 Power factor control terminal 0.94 no

[0098] It can be seen from Table 5 that the power factors of the nodes corresponding to each power factor control terminal are up to standard. Then, the voltages of the nodes corresponding to each second control terminal are obtained, referring to Table 6:

[0099] Table 6 Statistics of node voltages corresponding to the second control terminal (voltage control terminal)

[0100] Terminal Number Terminal Type Corresponding node voltage value (V) Is it beyond the limit? 1 Voltage regulation terminal 409 yes 3 Voltage regulation terminal 394 no 5 Voltage regulation terminal 392 no 6 Voltage regulation terminal 379 no 8 Voltage regulation terminal 377 no 9 Voltage regulation terminal 366 no 11 Voltage regulation terminal 369 no 13 Voltage regulation terminal 340 yes 14 Voltage regulation terminal 340 yes 15 Voltage regulation terminal 339 yes

[0101] It can be seen from Table 6 that the voltages of the nodes corresponding to the 4 voltage control terminals (second control terminals) No. 1, No. 13, No. 14 and No. 15 are out of limit. According to the voltage control terminal numbers corresponding to the 4 out-of-limit nodes, the voltage control terminal number corresponding to node No. 2 is the smallest, that is, voltage control terminal No. 1. The control authority of all cooperative control terminals except voltage control terminal No. 1 is locked, and the voltage of the node corresponding to voltage control terminal No. 1 is adjusted to 405V by adjusting the voltage regulating device of the node corresponding to voltage control terminal No. 1. After locking all cooperative control terminals for 60 seconds, the voltage values ​​of the nodes corresponding to each voltage control terminal are collected, as shown in Table 7:

[0102] Table 7 Statistics of node voltage corresponding to the second control terminal (voltage control terminal) after one adjustment

[0103]

[0104]

[0105] It can be seen from Table 7 that the voltages of the nodes corresponding to the three voltage control terminals (second control terminals), No. 13, No. 14, and No. 15, are out of limit. According to the voltage control terminal numbers corresponding to the three out-of-limit nodes, the voltage control terminal number corresponding to node No. 12 is the smallest, that is, voltage control terminal No. 13. Therefore, the control authority of all cooperative control terminals except voltage control terminal No. 13 is locked, and the voltage of the node corresponding to voltage control terminal No. 13 is adjusted to 345V by adjusting the voltage regulating device of the node corresponding to voltage control terminal No. 13. After locking all cooperative control terminals for 60 seconds, the voltage values ​​of the nodes corresponding to each voltage control terminal are collected, as shown in Table 8:

[0106] Table 8 Statistics of voltages of nodes corresponding to the second control terminal after secondary adjustment

[0107] Terminal Number Terminal Type Corresponding node voltage value (V) Is it beyond the limit? 1 Voltage regulation terminal 405 no 3 Voltage regulation terminal 390 no 5 Voltage regulation terminal 390 no 6 Voltage regulation terminal 378 no 8 Voltage regulation terminal 377 no 9 Voltage regulation terminal 364 no 11 Voltage regulation terminal 369 no 13 Voltage regulation terminal 345 no 14 Voltage regulation terminal 340 yes 15 Voltage regulation terminal 343 no

[0108] As shown in Table 8, the voltage of the node corresponding to the No. 14 voltage control terminal is out of limit. Lock the control authority of all cooperative control terminals except the No. 14 voltage control terminal, and adjust the voltage of the node where the No. 14 voltage control terminal is located to 346V by adjusting the voltage regulation device of the node corresponding to the No. 14 voltage control terminal. After locking all cooperative control terminals for 60 seconds, collect the voltage values ​​of the nodes corresponding to each voltage control terminal, see Table 9:

[0109] Table 9 Statistics of the voltage of the corresponding nodes of the second control terminal (voltage control terminal) after three adjustments

[0110]

[0111]

[0112] It can be seen from Table 9 that the voltages of the nodes corresponding to all voltage control terminals (second control terminals) are within the limit, and finally the coordinated control of the substation regulation equipment is achieved.

[0113] Accordingly, refer to Figure 4 The embodiment of the present invention further provides a collaborative control device suitable for substation voltage control, comprising an acquisition module 101, a numbering module 102, a first control module 103 and a second control module 104; wherein,

[0114] The acquisition module 101 is used to acquire all the regulating devices in the substation area and the cooperative control terminals corresponding to each regulating device; wherein the regulating devices include reactive power regulating devices and voltage regulating devices; the cooperative control terminal corresponding to the reactive power regulating device is the first control terminal; and the cooperative control terminal corresponding to the voltage regulating device is the second control terminal;

[0115] The numbering module 102 is used to number each cooperative control terminal from 1 in sequence according to the voltage arrays of the nodes corresponding to each cooperative control terminal within the first preset time range and in the order of the smallest voltage value in each voltage array from large to small; wherein each voltage array corresponds to each cooperative control terminal one by one;

[0116] The first control module 103 is used to control all cooperative control terminals according to the power factor values ​​of the nodes corresponding to all the first control terminals at the current moment, in combination with the preset first threshold and the number of the cooperative control terminal;

[0117] When the power factor requirements of all first control terminals are met, the second control module 104 is used to control all collaborative control terminals according to the voltage values ​​of the nodes corresponding to all second control terminals at the current moment, combined with the preset voltage threshold range and the number of the collaborative control terminal, until the voltage value requirements of the nodes corresponding to all second control terminals are met.

[0118] As a preferred implementation, the first control module 103 controls all cooperative control terminals according to the power factor values ​​of the nodes corresponding to all first control terminals at the current moment, combined with the preset first threshold and the number of the cooperative control terminal, specifically:

[0119] The first control module 103 obtains power factor values ​​of nodes corresponding to all first control terminals at the current moment; when there is at least one first control terminal whose power factor is less than a first threshold, the following first control operation is repeatedly performed on all collaborative control terminals until there is no first control terminal whose power factor is less than the first threshold:

[0120] The control authority of all cooperative control terminals other than the one with the largest number is locked for a second preset time, and the power factor value of the node corresponding to the cooperative control terminal with the largest number is adjusted to be greater than or equal to the first threshold.

[0121] As a preferred implementation, the second control module 104 controls all cooperative control terminals according to the voltage values ​​of the nodes corresponding to all second control terminals at the current moment, combined with the preset voltage threshold range and the number of the cooperative control terminal, specifically:

[0122] The second control module 104 obtains the voltage values ​​corresponding to all the second control terminals at the current moment, and when there is a voltage value of a node corresponding to at least one second control terminal within the preset voltage threshold range, the following second control operation is repeatedly performed on all the cooperative control terminals until there is no voltage value of a node corresponding to the second control terminal within the preset voltage threshold range:

[0123] The control authority of all cooperative control terminals other than the one with the smallest number is locked for a third preset time, and the voltage of the node corresponding to the cooperative control terminal with the smallest number is adjusted until it is outside the preset voltage threshold range.

[0124] Compared with the prior art, the embodiments of the present invention have the following beneficial effects:

[0125] The embodiment of the present invention provides a collaborative control method and device suitable for substation voltage control, the method comprising: obtaining all regulating devices in the substation and the collaborative control terminals corresponding to each regulating device; wherein the regulating device comprises a reactive regulating device and a voltage regulating device; the collaborative control terminal corresponding to the reactive regulating device is a first control terminal; the collaborative control terminal corresponding to the voltage regulating device is a second control terminal; according to the voltage array of the node corresponding to each collaborative control terminal within the first preset time range, in the order of the minimum voltage value in each voltage array from large to small, the collaborative control terminals are numbered from 1 in sequence; wherein each voltage array corresponds to each collaborative control terminal one by one; according to the power factor value of the node corresponding to all the first control terminals at the current moment, combined with the preset first threshold value and the number of the collaborative control terminal, all the collaborative control terminals are controlled; when the power factor requirements of all the first control terminals are met, according to the voltage value of the node corresponding to all the second control terminals at the current moment, combined with the preset voltage threshold range and the number of the collaborative control terminal, all the collaborative control terminals are controlled until the voltage value requirements of the nodes corresponding to all the second control terminals are met. Compared with the existing technology, the collaborative control terminals are divided into power factor control terminals (first control terminals) and voltage control terminals (second control terminals), and the collaborative control terminals are numbered according to the voltage array of the nodes within the first preset time range. According to the power factor value of the first control terminal and the voltage value of the second control terminal, coordinated control based on substations is achieved without major upgrades to the power grid, thereby improving the reliability and stability of the power grid.

[0126] Furthermore, the coordination and cooperation of the actions of various regulating devices can be achieved through communication networking between the master terminal and the slave terminal. For substations with reactive power or voltage problems, the reactive power problems and voltage problems can be solved separately from the end, further reducing the amount of transformation brought about by the growth of electricity demand.

[0127] Furthermore, it is suitable for situations where there are multiple regulating devices in the substation. The regulating devices can be identified based on the distance between them, which reduces the degree of manual intervention to a certain extent and can solve reactive power problems and voltage problems in stages.

[0128] Furthermore, by controlling the time difference and locking the control authority, the mutual coupling between reactive power and voltage leading to effect fluctuations and frequent actions can be avoided, which can effectively improve the coordinated effect of substation voltage control.

[0129] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A coordinated control method suitable for area voltage control, characterized in that: include: Acquire all regulating devices in the substation area and the cooperative control terminals corresponding to each regulating device; wherein the regulating devices include reactive power regulating devices and voltage regulating devices; the cooperative control terminal corresponding to the reactive power regulating device is the first control terminal; and the cooperative control terminal corresponding to the voltage regulating device is the second control terminal; According to the voltage arrays of the nodes corresponding to the cooperative control terminals within the first preset time range, the cooperative control terminals are numbered from 1 in descending order of the minimum voltage values ​​in the voltage arrays; wherein each voltage array corresponds to each cooperative control terminal one by one; Controlling all cooperative control terminals according to power factor values ​​of nodes corresponding to all first control terminals at the current moment, in combination with a preset first threshold and the number of the cooperative control terminal; When the power factor requirements of all the first control terminals are met, all the cooperative control terminals are controlled according to the voltage values ​​of the nodes corresponding to all the second control terminals at the current moment, in combination with the preset voltage threshold range and the number of the cooperative control terminal, until the voltage value requirements of the nodes corresponding to all the second control terminals are met; The controlling of all cooperative control terminals according to the power factor values ​​of the nodes corresponding to all first control terminals at the current moment, in combination with the preset first threshold and the number of the cooperative control terminal, is specifically as follows: Obtaining power factor values ​​of all nodes corresponding to the first control terminals at the current moment; When there is at least one first control terminal whose corresponding power factor is less than the first threshold, repeatedly perform the following first control operation on all cooperative control terminals until there is no first control terminal whose corresponding power factor is less than the first threshold: Blocking the control authority of all cooperative control terminals other than the largest numbered terminal for a second preset time, and adjusting the power factor value of the node corresponding to the cooperative control terminal with the largest numbered terminal to be greater than or equal to the first threshold; The controlling of all cooperative control terminals according to the voltage values ​​of the nodes corresponding to all second control terminals at the current moment, in combination with the preset voltage threshold range and the number of the cooperative control terminal, is specifically as follows: Obtain the voltage values ​​corresponding to all second control terminals at the current moment. When there is at least one second control terminal corresponding to a node whose voltage value is within a preset voltage threshold range, repeat the following second control operation on all cooperative control terminals until there is no second control terminal corresponding to a node whose voltage value is within the preset voltage threshold range: The control authority of all cooperative control terminals other than the one with the smallest number is locked for a third preset time, and the voltage of the node corresponding to the cooperative control terminal with the smallest number is adjusted until it is outside the preset voltage threshold range.

2. A coordinated control method for area voltage control according to claim 1, characterized in that: The obtaining of the power factor values ​​of the nodes corresponding to all the first control terminals at the current moment is specifically as follows: The voltage value and current value of the node corresponding to each first control terminal at the current moment are obtained, and a voltage array and a current array are constructed respectively, and then the power factor value of the node corresponding to each first control terminal is calculated.

3. A coordinated control method for area voltage control according to claim 1, characterized in that: Before the collaborative control terminals are numbered sequentially starting from 1, the method further includes: Set the cooperative control terminal closest to the substation as the master terminal, and the other cooperative control terminals as slave terminals; The master terminal is controlled to communicate with all slave terminals three times respectively, and the total number of cooperatively controlled terminals is updated according to the results of the three communications.

4. A coordinated control method for area voltage control as claimed in claim 3, characterized in that: The controlling the master terminal to communicate with all slave terminals three times respectively is specifically as follows: Controlling the master terminal to communicate with all slave terminals three times respectively through a broadband carrier; Alternatively, the master terminal is controlled to communicate with all slave terminals three times respectively through micro-power wireless.

5. A coordinated control method for substation voltage control according to any one of claims 1 to 4, characterized in that: The collaborative control terminal includes a sampling measurement module, a broadband carrier module, a micro-power wireless module, a control judgment module and a control output module; wherein, The sampling and measuring module is used to obtain voltage and current, and calculate the corresponding power factor, active power and reactive power; The broadband carrier module and the micro-power wireless module are used to communicate with other collaborative control terminals; The control judgment module is used to judge whether the preset judgment condition is met; The control output module is used to respond to action instructions and control corresponding regulating equipment.

6. A coordinated control device suitable for area voltage control, characterized in that: It includes an acquisition module, a numbering module, a first control module and a second control module; wherein, The acquisition module is used to acquire all the regulating devices in the substation and the cooperative control terminals corresponding to each regulating device; wherein the regulating devices include reactive power regulating devices and voltage regulating devices; the cooperative control terminal corresponding to the reactive power regulating device is the first control terminal; and the cooperative control terminal corresponding to the voltage regulating device is the second control terminal; The numbering module is used to number each collaborative control terminal from 1 in sequence according to the voltage arrays of the nodes corresponding to each collaborative control terminal within the first preset time range and in the order of the minimum voltage values ​​in each voltage array from large to small; wherein each voltage array corresponds to each collaborative control terminal one by one; The first control module is used to control all cooperative control terminals according to the power factor values ​​of the nodes corresponding to all the first control terminals at the current moment, in combination with the preset first threshold and the number of the cooperative control terminal; When the power factor requirements of all the first control terminals are met, the second control module is used to control all the cooperative control terminals according to the voltage values ​​of the nodes corresponding to all the second control terminals at the current moment, in combination with the preset voltage threshold range and the number of the cooperative control terminal, until the voltage value requirements of the nodes corresponding to all the second control terminals are met; The first control module controls all cooperative control terminals according to the power factor values ​​of the nodes corresponding to all first control terminals at the current moment, combined with the preset first threshold and the number of the cooperative control terminal, specifically: The first control module obtains power factor values ​​of nodes corresponding to all first control terminals at the current moment; when there is at least one first control terminal whose power factor is less than a first threshold, repeatedly performs the following first control operation on all collaborative control terminals until there is no first control terminal whose power factor is less than the first threshold: Blocking the control authority of all cooperative control terminals other than the largest numbered terminal for a second preset time, and adjusting the power factor value of the node corresponding to the cooperative control terminal with the largest numbered terminal to be greater than or equal to the first threshold; The second control module controls all cooperative control terminals according to the voltage values ​​of the nodes corresponding to all second control terminals at the current moment, in combination with the preset voltage threshold range and the number of the cooperative control terminal, specifically: The second control module obtains the voltage values ​​corresponding to all the second control terminals at the current moment, and when there is a voltage value of a node corresponding to at least one second control terminal within a preset voltage threshold range, repeatedly performs the following second control operation on all the collaborative control terminals until there is no voltage value of a node corresponding to the second control terminal within the preset voltage threshold range: The control authority of all cooperative control terminals other than the one with the smallest number is locked for a third preset time, and the voltage of the node corresponding to the cooperative control terminal with the smallest number is adjusted until it is outside the preset voltage threshold range.

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