Control method, device and system for optimizing voltage and reactive power of distribution network

Abstract

The embodiments of this specification disclose a control method, device and system for optimizing the voltage and reactive power of a distribution network. Among them, the control method applied to the master station side includes: receiving an adjustment request issued by a first device; obtaining distribution network data; determining the adjustment capability of the first device; if the first device has the adjustment capability, and it is determined according to the distribution network data that the adjustment request does not meet the preset control target, then sending a termination action instruction to the first device to cause the first device to terminate the adjustment action and perform optimization control. Applying the technical solution of the embodiments of this specification, the device side reports the voltage and reactive power adjustment demand to the master station. The master station coordinates the mutual actions between the devices at all levels according to the device's request and the optimization control target of the regional voltage and reactive power, realizes the reactive power balance on the spot, improves the transmission capacity of the line, and optimizes the control effect of the regional voltage and reactive power.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a control method, a control device and a control system for optimizing voltage and reactive power of a distribution network. Background Art

[0002] The power system is a large-scale, extremely complex and nonlinear system. The loads in the system consume not only active power but also reactive power. If the reactive power of the system is insufficient, the voltage level of the system will be reduced, and the load will operate at a voltage lower than the rated voltage, which will have a great impact on the safe operation of the equipment, such as insufficient motor processing, equipment temperature rise, and reduced system stability. If the reactive power of the system is excessive, the system voltage will increase. If the voltage is too high, it may damage the insulation of the equipment and affect the safe operation of the equipment.

[0003] Reactive power compensation can be performed by installing voltage reactive power equipment in the distribution network, but many of these voltage reactive power equipment are not in a communication state, and there is a lack of coordination and control between the equipment. When the voltage reactive power equipment is adjusting the voltage reactive power, it is basically controlled independently based on its own collected data, and it is impossible to optimize the voltage reactive power of the area. In the adjustment process, reactive current will flow over long distances, causing serious line losses. Summary of the invention

[0004] The embodiments of this specification provide a control method, a control device and a control system for optimizing the voltage and reactive power of a distribution network, which are used to solve the technical problem that the voltage and reactive power of the existing distribution network lack optimized control.

[0005] To solve the above technical problems, the embodiments of this specification are implemented as follows:

[0006] On the one hand, an embodiment of this specification provides a control method for optimizing voltage and reactive power of a distribution network, which is applied to a master station side, and includes:

[0007] receiving an adjustment request sent by the first device;

[0008] Obtain distribution network data;

[0009] determining a regulation capability of the first device;

[0010] If the first device has regulation capability and determines according to the power distribution network data that the regulation request does not meet the preset control target, a termination action instruction is issued to the first device so that the first device terminates the regulation action and performs optimization control;

[0011] The optimization control includes: when the adjustment request is a voltage pre-regulation request, sending a voltage adjustment instruction to the second device so that the second device adjusts the voltage to meet the voltage pre-regulation request of the first device; when the adjustment request is a reactive power pre-regulation request, sending a reactive power adjustment instruction to the third device so that the third device adjusts the reactive power to meet the reactive power pre-regulation request of the first device.

[0012] On the other hand, the embodiment of this specification also provides a control method for optimizing voltage and reactive power of a distribution network, which is applied to a device side and includes:

[0013] Collect the operation data of the equipment in real time;

[0014] If the operating data does not meet the set value, an adjustment request is sent to the master station;

[0015] If the device has the adjustment capability, then when the master station determines that the adjustment request satisfies the preset control target, it receives the action permission instruction issued by the master station, or when the master station determines that the adjustment request does not satisfy the preset control target, it receives the action termination instruction issued by the master station;

[0016] The operating parameters of the device are adjusted according to the allowable action instruction, or the adjustment action is terminated according to the terminate action instruction.

[0017] On the other hand, the embodiment of this specification also provides a control device for optimizing voltage and reactive power of a distribution network, which is applied to a master station side and includes:

[0018] A receiving module, configured to receive an adjustment request sent by the first device;

[0019] a capability determination module configured to determine a regulation capability of the first device;

[0020] A data acquisition module is configured to acquire distribution network data;

[0021] The control module is configured to, if the first device has an adjustment capability and it is determined according to the distribution network data that the adjustment request does not meet a preset control target, send a termination action instruction to the first device, so that the first device terminates the adjustment action and performs the optimization control; the optimization control includes: when the adjustment request is a voltage pre-adjustment request, determine a second device according to the distribution network data, and send a voltage adjustment instruction to the second device, so that the second device adjusts the voltage to meet the voltage pre-adjustment request of the first device; when the adjustment request is a reactive power pre-adjustment request, determine a third device according to the distribution network data, and send a reactive power adjustment instruction to the third device, so that the third device adjusts the reactive power to meet the reactive power pre-adjustment request of the first device.

[0022] On the other hand, the embodiment of this specification also provides a control device for optimizing voltage and reactive power of a distribution network, which is applied to a device side and includes:

[0023] A collection module is configured to collect operation data of the device in real time;

[0024] A request module, configured to send an adjustment request to the master station if the operating data does not meet the set value;

[0025] a receiving module configured to, if the device has an adjustment capability, receive an allow action instruction issued by the master station when the master station determines that the adjustment request satisfies a preset control target, or receive a terminate action instruction issued by the master station when the master station determines that the adjustment request does not satisfy the preset control target;

[0026] The adjustment module is configured to adjust the operating parameters of the device according to the allow action instruction, or terminate the adjustment action according to the terminate action instruction.

[0027] On the other hand, an embodiment of the present specification also provides a control system for optimizing the voltage and reactive power of a distribution network, comprising a master station side control device as described above and an equipment side control device as described above, wherein the master station side control device is arranged in a substation, and there are multiple equipment side control devices, which are respectively arranged in multiple voltage and reactive power devices in the distribution network, and the master station side control device is communicatively connected with the multiple equipment side control devices and can execute the control method as described above.

[0028] The embodiments of this specification adopt at least one of the above-mentioned technical solutions to achieve the following beneficial effects: when the voltage reactive device in the distribution network determines that the output needs to be adjusted, the voltage reactive adjustment demand of the device is promptly reported to the main station through an adjustment request. The main station coordinates the mutual actions between the devices at all levels according to the request of the device and the optimization control target of the regional voltage reactive power, realizes the local balance of reactive power, and reduces the flow of reactive power in the power grid. Since the line loss caused by the reactive power flow is reduced, the active current passing capacity of the line is increased, the transmission capacity of the line is improved, and the optimization control of the regional voltage reactive power is ultimately guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of this specification or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this specification. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0030] Figure 1 It is a schematic diagram of the distribution of voltage and reactive power equipment in the distribution network;

[0031] Figure 2 This is a flow chart of a master station side control method according to Embodiment 1;

[0032] Figure 3 This is a flow chart of another master station side control method of embodiment 1;

[0033] Figure 4 This is a flow chart of the device side control method of Embodiment 2;

[0034] Figure 5 This is a structural block diagram of the master station side control device of Example 3;

[0035] Figure 6 This is a structural block diagram of the device-side control device of Embodiment 4;

[0036] Figure 7 is a structural block diagram of a control system of Embodiment 5;

[0037] Figure 8 This is a schematic diagram of an application example of the control system of the fifth embodiment. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solutions in this specification, the technical solutions in the embodiments of this specification will be clearly and completely described below in conjunction with the drawings in the embodiments of this specification. Obviously, the described embodiments are only part of the embodiments of this application, not all of them. Based on the embodiments of this specification, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of this application.

[0039] Firstly, the voltage and reactive power problems existing in the current power grid are analyzed.

[0040] 1) Large line loss. At present, most reactive power compensation equipment is realized by centralized compensation in substations, and the reactive power configuration of lines and transformers is relatively small, which leads to unreasonable reactive power configuration, resulting in a large amount of reactive power flow in the transmission line, increasing line loss.

[0041] 2) Voltage qualification rate problem. Since the lines and transformers lack the necessary voltage regulation function, voltage regulation mainly relies on centralized voltage regulation at substations. The voltage regulation method is single, and frequent adjustment of the main transformer tap will also increase transformer failures. Therefore, the tap switch action of the substation has a strict limit on the number of times, and it cannot respond to voltage requirements in time when the voltage changes. For some long-distance transmission lines, under light load and heavy load conditions, serious voltage unqualified problems will occur.

[0042] 3) Unreasonable reactive power configuration. Most reactive power compensation equipment is designed according to the maximum capacity, and large-capacity fixed switching is mostly used. However, in actual applications, due to the fact that it is not operated at full load, the reactive power compensation equipment will be over-compensated when it is switched on, and under-compensated when it is not switched on. In addition, manual switching is mostly used, which cannot respond to the changing load demand in time.

[0043] 4) Lack of management of voltage and reactive power equipment. Since most voltage and reactive power equipment are installed in a decentralized manner and have poor communication capabilities, the operating status of the equipment cannot be monitored in a timely manner and effective management cannot be performed.

[0044] 5) The control method of voltage and reactive power equipment is simple. Since most of the voltage and reactive power compensation devices currently used in the system are only judged and controlled by power factor or voltage switching, the control method is relatively simple and cannot meet the current comprehensive control requirements of voltage and reactive power.

[0045] 6) The automation level of voltage and reactive power equipment is low. At present, the switching of voltage and reactive power equipment mainly adopts manual switching, which cannot automatically control the switching in time according to the change of load.

[0046] 7) Poor equipment coordination ability. Most of the current voltage and reactive power equipment are installed in a decentralized manner and operate independently. There is no connection between the equipment, and there is no coordination function between the equipment, so it is impossible to achieve comprehensive voltage and reactive power integrated control.

[0047] 8) The three-phase imbalance of low-voltage transformers is serious. Due to the existence of single-phase loads and the irregular changes and distribution of single-phase loads, the current low-voltage three-phase imbalance is serious.

[0048] 9) The voltage and reactive power planning link is seriously disconnected from the operation link. The actual operation situation is not taken into consideration when planning the equipment. The operation of the equipment cannot be guided by planning, and the optimized and refined configuration cannot be carried out according to the operation results.

[0049] 10) The optimization software is disconnected from the equipment. Most of the current voltage and reactive power optimization software is based on the power flow analysis of the system. The equipment control is mainly concentrated in the substation and above power generation and transmission links, and the distribution network is basically not involved, resulting in the lack of effective optimization control of the distribution network that needs optimization the most.

[0050] It can be seen that, for the above problems existing in the power grid, it is difficult to achieve the optimization effect of the voltage and reactive power of the whole network by solving them only from the perspective of "point" or "line". Therefore, the inventors have proposed an optimization control method for the voltage and reactive power of the distribution network, which can optimize the system from the perspective of "surface" and solve most of the above problems.

[0051] First of all, it should be explained that the voltage and reactive power equipment distributed in the distribution network have different capabilities. Some have voltage regulation capabilities and can adjust the output voltage of the equipment to increase or decrease. Some have reactive power regulation capabilities and can perform reactive power compensation. Some equipment has both voltage regulation and reactive power regulation capabilities. This type of equipment can be called equipment with basic capabilities. In addition, some equipment with basic capabilities has reached the upper limit of regulation during operation and cannot continue to adjust or the adjustable amount is not enough to meet the demand. It can also be considered that the adjustment amount of the equipment is insufficient and does not have the adjustment ability. In addition, there is a type of equipment that cannot perform voltage and reactive power regulation itself, that is, insufficient basic capacity. Unless otherwise specified below, the "voltage and reactive power equipment" described in this manual covers equipment with various capabilities mentioned above, and the equipment "not having the adjustment ability" covers two situations: insufficient basic equipment capabilities and insufficient adjustment amount.

[0052] The control system and control method for optimizing voltage and reactive power of a power distribution network provided by the embodiments of this specification are described in detail below with reference to the accompanying drawings.

[0053] Figure 1 This is a schematic diagram of the distribution of voltage and reactive equipment in the distribution network. The substation is equipped with voltage and reactive equipment. The voltage and reactive integrated control device in the substation can be used to control the switching of the voltage and reactive equipment in the substation. Reactive compensation equipment and line voltage regulators are configured in the 10kV distribution line. By collecting the voltage and reactive data at each point of the distribution line, the switching of the voltage and reactive equipment of the line can be controlled. The equipment on the distribution side includes distribution transformers, distribution transformer intelligent terminals, voltage detectors, etc. According to the voltage and reactive data collected by the equipment on the distribution side, the switching of reactive compensation equipment can be controlled, and the distribution voltage can be guaranteed to be qualified through the voltage raising device.

[0054] Figure 1 All kinds of voltage reactive equipment in the distribution network are equipped with control devices, which can establish communication connections with the master station, send requests to the master station, report data, and receive responses or instructions from the master station. The master station can collect data and centrally control the voltage reactive equipment in the distribution network. The master station realizes data collection, data analysis and optimization control through a system combining software and hardware. The various functions of the master station can be completed by independent software and hardware modules, including: the data acquisition module collects distribution network data through the acquisition unit and stores it in a dedicated database, the data analysis module outputs the analysis results based on the collected distribution network data using dedicated analysis software, and the optimization control module issues corresponding control instructions to the network equipment based on the analysis results of the data analysis software. The host hardware of the master station system can be a single or clustered computer or workstation, and can be set up in the substation.

[0055] The following describes the specific implementation methods of the control method, control device and control system for optimizing the voltage and reactive power of the distribution network provided by the present application.

[0056] Embodiment 1:

[0057] Figure 2 The flowchart of a master station side control method for optimizing voltage and reactive power of a distribution network is schematically shown.

[0058] like Figure 2 As shown, the master station side control method of the first embodiment includes operations S110, S120, S131 and S141.

[0059] S110: Receive an adjustment request sent by a first device.

[0060] S120, obtaining distribution network data;

[0061] S130: Determine the adjustment capability of the first device.

[0062] S141: If the first device has regulation capability and determines according to the distribution network data that the regulation request does not meet the preset control target, a termination action instruction is sent to the first device to cause the first device to terminate the regulation action and perform optimization control.

[0063] The optimization control specifically includes: when the adjustment request is a voltage pre-adjustment request, sending a voltage adjustment instruction to the second device so that the second device adjusts the voltage to meet the voltage pre-adjustment request of the first device; when the adjustment request is a reactive power pre-adjustment request, sending a reactive power adjustment instruction to the third device so that the third device adjusts the reactive power to meet the reactive power pre-adjustment request of the first device.

[0064] The second device or the third device is determined according to the distribution network data, the second device is an upper-level device of the first device, and the second device has voltage regulation capability, and the third device is a lower-level device of the first device, and the third device has reactive power regulation capability.

[0065] According to the scheme of embodiment 1, in operation S110, the first device is a voltage reactive device in the distribution network, which may be a voltage device with voltage regulation capability, so that the output voltage of the device can be adjusted to increase or decrease, or a reactive device with reactive regulation capability, which can perform reactive compensation or balance, or a device with both voltage regulation and reactive regulation capabilities, or a device without voltage or reactive regulation capabilities, or a device with insufficient regulation capability. Correspondingly, the regulation capability of the first device includes voltage regulation capability, reactive regulation capability, and voltage reactive regulation capability. The type of regulation request issued by the first device includes a pre-regulation request for the voltage or reactive power of the device to be qualified, or a request to the master station to ensure the voltage or reactive power of the device to be qualified by other means. The content of the regulation request issued by the first device includes the type of pre-regulated voltage or reactive power, the value or gear required to be adjusted, and may also include the capability information of the first device, that is, the basic capability and adjustable amount of the first device.

[0066] The distribution network data in operation S120 include: voltage and reactive power operation data of each node device in the distribution network, and flow data of the distribution network. The voltage and reactive power operation data of each node device include the basic voltage and reactive power capacity of each node device, the preset upper and lower lines of voltage and reactive power, and the voltage and reactive power parameters in the current operation. Correspondingly, each node device needs to report the operation data of the device to the master station in real time or regularly. The flow of the distribution network is data that needs to be continuously monitored. The prior art already has a complete monitoring solution, and the embodiments of this specification do not limit this.

[0067] In operation S130, the regulation capability of the first device may be determined through power distribution network data, or, when the regulation request sent by the first device carries information about the regulation capability, may be directly determined based on the content of the regulation request.

[0068] In operation S141, the preset control target may include a preset regional control principle and a corresponding regional optimization algorithm. The regional control principle involves various aspects of the regional control, including, for example, voltage control priority or reactive compensation priority, voltage control from top to bottom, reactive control from bottom to top, reactive discrete compensation and smooth compensation combined, global optimization with the lowest voltage deviation as the goal, global optimization with the highest global node qualification rate and the lowest distribution network loss as the optimization goal, regional voltage over-limit deviation as the real-time voltage optimization reference, etc. Under the set control principle, there are different corresponding regional optimization algorithms, such as: a relaxed voltage reactive optimization algorithm of quadratic constraint quadratic optimization, an improved particle swarm algorithm, or an improved genetic algorithm. Since different regional distribution networks have their own characteristics, the control targets preset for the region may be different.

[0069] In some scenarios, when the first device issues a voltage regulation request, the master station can first determine whether the reason for the voltage regulation of the requesting node is caused by the line based on the regional control principle. If so, the voltage regulation demand of the first device is met by adjusting the voltage of the upper device in the line. If the upper device does not have the regulation capability at this time (the basic capability is insufficient or the voltage regulation quota is insufficient), the regulation request of the first device is carried out to meet the control target, that is, the first device is allowed to regulate the voltage. Correspondingly, if the first device issues a reactive power regulation request, the master station can first determine whether the reason for the reactive power regulation of the requesting node is caused by the line based on the regional control principle. If so, the reactive power regulation demand of the first device is met by adjusting the reactive power of the lower device in the line. If the lower device does not have the regulation capability at this time (the basic capability is insufficient or the reactive power regulation quota is insufficient), the regulation request of the first device is carried out to meet the control target, that is, the first device is allowed to regulate the reactive power.

[0070] In operation S141, the master station also needs to determine the second device or the third device when performing optimization control, specifically including: determining the upper device or lower device associated with the first device based on the gene map relationship of the first device in the distribution network; determining the upper device with voltage regulation capability as the second device according to the voltage reactive operation data of the upper device contained in the distribution network data, or determining the lower device with reactive regulation capability as the third device according to the voltage reactive operation data of the lower device. The connection structure between each node device in the distribution network has a gene map relationship, for example, Figure 1 In the figure, the upper-level device of the line voltage regulator is the line compensation device, the upper-level device is the substation, the lower-level device of the line voltage regulator is the distribution transformer, and the lower-level device is the distribution intelligent terminal.

[0071] By using the gene map relationship of the first device in the distribution network, the superior device and the subordinate device of the first device can be determined, and through the distribution network data, specifically the voltage and reactive power operation data of each node device, it can be determined whether the superior device or the subordinate device has the response capability to respond to the adjustment request. If the superior device of the first device has the adjustment capability and the adjustment amount is sufficient, it is determined that the superior device has the response capability and can be used as the second device. If not, it is determined whether the superior device of the first device meets the condition, and so on. Through the preset control target, it can also be limited to only evaluate the response capability of the superior device of the first device. If the superior device of the first device does not have the response capability, the adjustment action of the first device is allowed, and the response capability of its superior device is no longer evaluated. A similar method can be used to determine the third device.

[0072] In operation S141, the master station sends an instruction to terminate the action to the first device, which can realize a closed loop response to the adjustment request of the first device and obtain a more complete control effect. In particular, in some implementation scenarios, considering reasons such as communication failure, when the first device cannot receive the instruction sent by the master station in time and delays the voltage and reactive power adjustment, the first device can be set to actively perform the adjustment action according to the needs of the device when it does not receive the instruction to allow the action or terminate the action sent by the master station.

[0073] In another implementation of the master station side control method, other branch operations may be included after operation S130 of the technical solution of embodiment 1. Figure 3 A flow chart schematically shows another control method at the master station side.

[0074] like Figure 3 As shown, based on the technical solution of the first embodiment, after operation S130, operation S142 is further included.

[0075] S142: If the first device does not have the adjustment capability, directly perform optimization control.

[0076] When the first device does not have the regulation capability, the regulation request it sends reflects the demand for voltage or reactive power regulation, and it is expected that the master station will meet the demand in other ways. Therefore, when the master station determines that the first device does not have the regulation capability, it can combine the regulation request and determine the second device or third device that meets the preset control target and the corresponding regulation parameters according to the regional optimization algorithm, thereby performing optimization control.

[0077] like Figure 3 As shown, based on the technical solution of the first embodiment, after operation S130, operation S143 is further included.

[0078] S143: If the adjustment result meets the preset control target, an action permission instruction is sent to the first device to enable the first device to perform the adjustment action.

[0079] When the first device has the adjustment capability and the adjustment request it sends can meet the preset control target, the master station allows the first device to perform the adjustment action. The master station can pre-calculate the state of the distribution network after the first device executes the adjustment action it requested. If the adjusted distribution network meets the following conditions: the voltage reactive power of the equipment at each level meets the corresponding safety requirements, the number of adjustment actions required by other node devices is the minimum, and the voltage reactive power of the area after adjustment is within the optimization range, then it is considered that the adjustment request meets the preset control target. These calculations and judgments can be achieved through mathematical optimization algorithms, such as a relaxed voltage reactive power optimization algorithm for quadratic constraint quadratic optimization, based on an improved particle swarm algorithm, or based on an improved genetic algorithm, etc., and this specification does not limit this. Compared with the method in the prior art that only relies on flow data calculation and judgment, the technical solution of this embodiment combines the equipment adjustment capability and can be optimized from a global perspective, which is conducive to achieving the optimal effect of regional voltage reactive power.

[0080] In addition, the above operations S141, S142 and S143 may be implemented individually or in combination.

[0081] According to the technical solution of embodiment 1, the master station coordinates the mutual actions between the equipment at all levels based on the adjustment request of the equipment and the optimization control target of the regional voltage and reactive power, so as to meet the local reactive power balance and reduce the flow of reactive power in the power grid, improve the qualified rate of the regional voltage, and thus achieve the optimal control effect of the regional voltage and reactive power.

[0082] Embodiment 2:

[0083] Figure 4 A flow chart of a device-side control method for optimizing voltage and reactive power of a distribution network provided in Embodiment 2 is schematically shown.

[0084] like Figure 4 As shown, the device-side control method of the second embodiment includes operations S210 to S240.

[0085] S210, collecting operation data of the device in real time.

[0086] S220: If the operating data does not meet the set value, an adjustment request is sent to the master station.

[0087] S230, if the device has adjustment capability, then when the master station determines that the adjustment request meets the preset control target, it receives an allow action instruction issued by the master station, or when the master station determines that the adjustment request does not meet the preset control target, it receives a terminate action instruction issued by the master station.

[0088] S240: adjusting the operating parameters of the device according to the allow action instruction, or terminating the adjustment action according to the terminate action instruction.

[0089] In the second embodiment, if the device has the ability to adjust, it can request adjustment from the master station according to the operating data of the device and receive the response of the master station to continue or terminate the adjustment action of the device. When the adjustment request meets the control target preset by the master station, the master station allows it to perform the adjustment action. When its adjustment request does not meet the control target preset by the master station, the master station will terminate its adjustment action and send adjustment instructions to other devices instead. After the other devices perform the adjustment, they can meet the adjustment requirements of the current device.

[0090] The device-side control method of the second embodiment further includes, if the device has the ability to adjust, if it does not receive the permission action instruction or the termination action instruction issued by the master station within the set time, automatically adjusting the operating parameters of the device. When communication fails or is delayed, if the device cannot obtain effective instructions from the system within the specified time, the device will automatically control according to its own judgment target to ensure that the voltage and reactive power can be met in time.

[0091] In some embodiments, when the device does not have the adjustment capability, the device only needs to perform operations S210 and S220, that is, report the adjustment requirements to the master station. The master station determines a suitable device with adjustment capability for the device based on the optimization algorithm, and satisfies the adjustment requirements of the device through the adjustment of other devices.

[0092] In some embodiments, when the operating parameters of the device meet the requirements, such as the voltage is qualified, the device needs to maintain a communication connection with the master station. When the device needs to respond to adjustments due to the adjustment requirements of other devices in the distribution network, the master station will send an adjustment instruction to the device, and the device can meet the adjustment requirements of other devices after executing the adjustment.

[0093] According to the scheme of the second embodiment, the voltage reactive device sends an adjustment request to the master station according to its own operating status. The master station coordinates the mutual actions between the devices at all levels according to the optimization control target of the regional voltage reactive power, thereby achieving the optimal control effect of the regional voltage reactive power. Compared with the scheme in the prior art in which the device side only reports the operating data to the master station and the master station performs centralized control, the scheme of this embodiment triggers the optimization control of the master station side with the request of the device side, which has the advantages of strong real-time and strong pertinence.

[0094] Embodiment three:

[0095] Embodiment 3 provides a master station side control device for optimizing voltage and reactive power of a distribution network.

[0096] Figure 5 The structural block diagram of a master station side control device 300 for optimizing voltage and reactive power of a power distribution network provided in Embodiment 3 is schematically shown. The device 300 can be implemented as part or all of an electronic device through software, hardware or a combination of both.

[0097] like Figure 5 As shown, the control device 300 at the master station side includes a receiving module 310, a capability determination module 320 and a control module 330. The master station side device 300 can execute the various master station side methods described above.

[0098] The receiving module 310 is configured to receive an adjustment request sent by the first device.

[0099] The capability determination module 320 is configured to determine the regulation capability of the first device.

[0100] The control module 330 is configured to send a termination action instruction to the first device if the first device has the regulation capability and determines according to the distribution network data that the regulation request does not meet the preset control target, so that the first device terminates the regulation action and performs optimization control; the optimization control includes: when the regulation request is a voltage pre-regulation request, sending a voltage regulation instruction to the second device, so that the second device regulates the voltage to meet the voltage pre-regulation request of the first device; when the regulation request is a reactive power pre-regulation request, sending a reactive power regulation instruction to the third device, so that the third device regulates the reactive power to meet the reactive power pre-regulation request of the first device.

[0101] According to the technical solution of Example 3, the control module on the master station side coordinates the mutual actions between the equipment at all levels based on the adjustment request on the equipment side and the optimization control target of the regional voltage and reactive power, so as to meet the local balance of reactive power and thus reduce the flow of reactive power in the power grid, improve the qualified rate of regional voltage, and thus achieve the optimal control effect of regional voltage and reactive power.

[0102] Embodiment 4:

[0103] Embodiment 4 provides a device-side control apparatus for optimizing voltage and reactive power of a power distribution network.

[0104] Figure 6 The structural block diagram of a device-side control device 400 for optimizing voltage and reactive power of a power distribution network provided in Embodiment 4 is schematically shown. The device 400 can be implemented as part or all of an electronic device through software, hardware, or a combination of both.

[0105] like Figure 6 As shown, the device-side control apparatus 400 includes a collection module 410, a request module 420, a receiving module 430, and an adjustment module 440. The device-side apparatus 400 can execute the various device-side methods described above.

[0106] The acquisition module 410 is configured to acquire the operation data of the device in real time.

[0107] The request module 420 is configured to send an adjustment request to the master station if the operating data does not meet the set value.

[0108] The receiving module 430 is configured to, if the device has the adjustment capability, receive an allow action instruction issued by the master station when the master station determines that the adjustment request meets the preset control target, or to receive a terminate action instruction issued by the master station when the master station determines that the adjustment request does not meet the preset control target.

[0109] The adjustment module 440 is configured to adjust the operating parameters of the device according to the allow action instruction, or terminate the adjustment action according to the terminate action instruction.

[0110] According to the technical solution of the fourth embodiment, each module on the device side enables the corresponding function according to the operating state of the device. If the device has the adjustment capability and the operating data meets the set value, the receiving module 430 is also configured to monitor the adjustment instructions issued by the master station to respond to the adjustment request of other devices. Alternatively, if the device does not have the adjustment capability and the operating data does not meet the set value, only the acquisition module and the request module are enabled, and after issuing the request, the coordination control result of the master station is waited for.

[0111] According to the technical solution of the fourth embodiment, the control device on the equipment side sends an adjustment request to the master station according to the operating status of the voltage reactive device. The master station coordinates the mutual actions between the devices at all levels according to the optimized control target of the regional voltage reactive power, thereby achieving the optimal control effect of the regional voltage reactive power. The control device on the equipment side can also enable corresponding functions according to the operating status of the equipment, thereby enhancing the flexibility and applicability of the equipment side device.

[0112] Embodiment five:

[0113] Embodiment 5 provides a control system for optimizing voltage and reactive power of a power distribution network.

[0114] Figure 7 The structural block diagram of a control system 500 for optimizing voltage and reactive power of a power distribution network provided in Embodiment 5 is schematically shown. The system 500 can be implemented as part or all of an electronic device through software, hardware or a combination of both.

[0115] like Figure 7 As shown, the control system 500 includes the master station side control device 300 and the equipment side control device 400 mentioned above. The master station side control device 300 is arranged in the substation, and there are multiple equipment side control devices 400, which are respectively arranged in multiple voltage and reactive devices in the distribution network. The master station side control device 300 is communicatively connected with the multiple equipment side control devices 400 and can execute the various methods described above.

[0116] According to the control system of Example 5, the master station coordinates and optimizes the voltage and reactive power equipment in the area, including responding to the active request of the first device, and triggering the adjustment of the second device and the third device based on the request of the first device. The master station coordinates the mutual actions between the equipment at all levels according to the optimization control target of the regional voltage and reactive power, and achieves the optimal control effect of the regional voltage and reactive power. The equipment-side control device is bound to the voltage and reactive power equipment one by one, collects and reports the operation data of the equipment respectively, and issues a voltage and reactive power adjustment request when necessary, monitors the control instructions issued by the master station, and executes corresponding control actions according to the control instructions.

[0117] Now combined Figure 8 , the control operations performed by the control system provided in Example 5 are illustrated by way of example.

[0118] Figure 8 The voltage reactive devices of each node in the communication connection is established with the master station side control device through the device side control device. The master station is set in the substation (not shown in the figure). In the control system of the fifth embodiment, the device side implements the request mechanism, and the master station side implements the intervention mechanism, which is explained in the following through several embodiments.

[0119] 1) Request mechanism embodiment 1 on the device side

[0120] Assume that the line voltage regulator at ② is the first device, which has the voltage regulation capability. The device-side control device bound to the device can collect the voltage of the device in real time. When it is determined that the device voltage is lower than the set value, the control device at ② sends a voltage increase regulation request to the master station. After receiving the voltage increase regulation request at ②, the master station first determines whether the voltage of the substation at ① is close to the voltage lower limit value, and checks whether the voltage of other distribution lines at the substation at ① is also low or close to low voltage. If there is a low voltage in other distribution lines, it is determined that the low voltage on the outgoing line side of the upper substation causes the low voltage in the distribution line. At this time, according to the principle of voltage regulation from top to bottom, the voltage increase action of the first device at ② is terminated, and the voltage regulating device (i.e., the second device) at the substation at ① is preferentially selected for voltage regulation to solve the problem of generally low line voltage. If the master station does not find that other lines have low voltage after analysis, or the voltage regulating equipment of the substation at ① does not have the ability to increase the voltage (for example, the number of adjustments is limited or it has been adjusted to the highest voltage gear), then the adjustment request is processed to meet the control target, and an action permission instruction is issued to the first device at ② to allow it to perform voltage regulation. The first device at ② increases the voltage according to the action permission instruction, thereby ensuring the voltage qualification rate of the line and improving the power supply quality of the line. In this embodiment, the device adjusts the voltage reactive power according to its own needs, and the master station makes optimization judgments based on the distribution network data. When the voltage reactive power device needs to act according to the global optimization goal, it responds to the device's adjustment request to achieve regional optimization control.

[0121] 2) Request mechanism on the device side Example 2

[0122] If the first device does not have the voltage regulation capability, that is, the device itself does not have the voltage regulation capability, or the voltage regulation amount of the device is insufficient, the master station will control other devices to meet the regulation requirements of the first device. Assume that the device at ④ is the first device, which does not have the voltage regulation capability. When the operating voltage of the device at ④ is low, a voltage regulation request is issued, requesting the master station to ensure that the voltage at this location is qualified by other means. After receiving the voltage regulation request, the master station determines whether the line to which the device belongs has the ability to respond to the voltage regulation request through the gene map relationship in the distribution network, that is, whether other voltage regulation devices in the line can meet the voltage regulation request through voltage regulation. If the line has the voltage regulation capability, it is pre-determined by calculation whether the voltage of the devices at other locations in the line will exceed the limit after executing the voltage regulation action. If the voltage does not exceed the limit, it is determined that the line can respond to this request and perform corresponding optimization control. At this time, the master station sends a voltage regulation instruction to the line voltage regulator (i.e., the second device) at ②, and meets the voltage regulation requirement at ④ through the voltage regulation at ②. In this embodiment, the device adjusts the voltage and reactive power according to its own demand request, and the master station makes optimization judgments based on the distribution network data. When the voltage and reactive power equipment is required to act according to the global optimization goal, it responds to the adjustment request of the equipment to achieve regional optimization control.

[0123] 3) Master Station Side Intervention Mechanism Example 1

[0124] Assume that the substation at ① is the first device, and the reactive power at ① is low. The substation sends a reactive power regulation request. After analysis, the master station determines that the low reactive power of the substation is caused by the reactive power shortage of the lower-level line, and determines that the reactive power compensation device at ③ in the line (i.e., the third device) has the ability to regulate reactive power. At this time, the master station sends a termination action instruction to the first device at ①, so that the reactive power regulation device of the substation terminates the reactive power regulation action, and the third device at ③ performs reactive power regulation to meet the reactive power demand at ①. In this embodiment, the master station makes optimization judgments based on the distribution network data. When the voltage reactive power device needs to act according to the global optimization goal, the device requesting the action is intervened to modify the action to achieve regional optimization control.

[0125] 4) Example 2 of the intervention mechanism on the master station side

[0126] Assuming that the voltage of the line voltage regulator at ② meets the voltage control limit, and the line compensation device at ③ is the first device, the first device at ③ issues a voltage adjustment request. After comprehensive judgment, the master station determines that voltage adjustment at ② can achieve the effect of optimal control. Therefore, the master station terminates the voltage adjustment action at ③ and issues a voltage adjustment instruction to the line voltage regulator at ② (i.e., the second device), forcing the device at ② to adjust the voltage to meet the voltage adjustment requirements of the first device at ③. In this embodiment, the master station makes optimization judgments based on the power grid framework, voltage, reactive power conditions, and power flow conditions. When the voltage reactive power equipment needs to act according to the global optimization goal, intervention measures are taken for the normally operating equipment to force the equipment to act, thereby achieving regional optimization control.

[0127] According to the technical solution of Example 5, by constructing a distribution network optimization control system, the equipment adjusts the voltage and reactive power according to its own demand requests, the main station makes optimization judgments based on the distribution network data, responds to the equipment's adjustment requests, coordinates the mutual actions between regions, and realizes the optimization control of the voltage and reactive power of the distribution network, thereby ensuring the qualified rate of voltages at all levels in the region.

[0128] The above is a description of a specific embodiment of the present specification. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recorded in the claims can be performed in an order different from that in the embodiments and still achieve the desired results. In addition, the processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0129] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0130] The systems, devices, modules or units described in the above embodiments may be implemented by computer chips or entities, or by products with certain functions. A typical implementation device is a computer. Specifically, the computer may be, for example, a personal computer, a laptop computer, a cellular phone, a camera phone, a smart phone, a personal digital assistant, a media player, a navigation device, an email device, a game console, a tablet computer, a wearable device, or a combination of any of these devices.

[0131] For the convenience of description, the above devices are described in terms of functions and are divided into various units. Of course, when implementing one or more embodiments of this specification, the functions of each unit can be implemented in the same or multiple software and / or hardware.

[0132] Those skilled in the art will appreciate that the embodiments of this specification may be provided as methods, systems, or computer program products. Therefore, the embodiments of this specification may be in the form of complete hardware embodiments, complete software embodiments, or embodiments in combination with software and hardware. Moreover, the embodiments of this specification may be in the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0133] It should also be noted that the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprises a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0134] The specification may be described in the general context of computer-executable instructions executed by a computer, such as program modules. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform specific tasks or implement specific abstract data types. The specification may also be practiced in distributed computing environments where tasks are performed by remote processing devices connected through a communication network. In a distributed computing environment, program modules may be located in local and remote computer storage media including storage devices.

[0135] Each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. In particular, for the system embodiment, since it is basically similar to the method embodiment, the description is relatively simple, and the relevant parts can be referred to the partial description of the method embodiment.

[0136] The above is only an embodiment of this specification and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A control method for optimizing voltage and reactive power of a distribution network, applied to a master station, characterized in that: include: receiving an adjustment request sent by the first device; Obtain distribution network data; determining a regulation capability of the first device; If the first device has regulation capability and determines according to the power distribution network data that the regulation request does not meet the preset control target, a termination action instruction is issued to the first device so that the first device terminates the regulation action and performs optimization control; The optimization control includes: when the adjustment request is a voltage pre-adjustment request, issuing a voltage adjustment instruction to the second device so that the second device adjusts the voltage to meet the voltage pre-adjustment request of the first device; when the adjustment request is a reactive power pre-adjustment request, issuing a reactive power adjustment instruction to the third device so that the third device adjusts the reactive power to meet the reactive power pre-adjustment request of the first device; The second device or the third device is determined according to the distribution network data, the second device is an upper-level device of the first device and has voltage regulation capability, and the third device is a lower-level device of the first device and has reactive power regulation capability.

2. The method according to claim 1, characterized in that The method further comprises: If the first device has the regulation capability and it is determined according to the power distribution network data that the regulation request meets the preset control target, an action permission instruction is sent to the first device to enable the first device to perform the regulation action.

3. The method according to claim 1, characterized in that The method further comprises: If the first device does not have the adjustment capability, then the optimization control is performed.

4. The method according to claim 1, characterized in that: The distribution network data includes: The voltage and reactive power operation data of each node device in the distribution network, and the flow data of the distribution network, wherein the voltage and reactive power operation data of each node device include the basic voltage and reactive power capacity of each node device, the preset upper and lower limits of voltage and reactive power, and the voltage and reactive power parameters in the current operation.

5. A control method for optimizing voltage and reactive power of a distribution network, applied to a device side, characterized in that: include: Collect the operation data of the equipment in real time; If the operating data does not meet the set value, an adjustment request is sent to the master station; If the device has the regulation capability, then when the master station determines that the regulation request satisfies the preset control target, the device receives an action permission instruction issued by the master station, or when the master station determines that the regulation request does not satisfy the preset control target, the device receives an action termination instruction issued by the master station, so that the master station performs the following optimization control: when the regulation request is a voltage pre-regulation request, a voltage regulation instruction is issued to the second device, so that the second device regulates the voltage to meet the voltage pre-regulation request of the first device; In the case where the regulation request is a reactive pre-regulation request, a reactive regulation instruction is issued to a third device, so that the third device regulates reactive power to meet the reactive pre-regulation request of the first device; wherein the second device or the third device determines, according to the distribution network data, that the second device is an upper-level device of the first device and has a voltage regulation capability, and the third device is a lower-level device of the first device and has a reactive regulation capability; The operating parameters of the device are adjusted according to the allowable action instruction, or the adjustment action is terminated according to the terminate action instruction.

6. The method according to claim 5, characterized in that The method further comprises: If the device has the adjustment capability, it will automatically adjust the operating parameters of the device if it does not receive the action permission instruction or the action termination instruction issued by the master station within the set time.

7. A master station side control device for optimizing voltage and reactive power of a distribution network, characterized in that: include: A receiving module, configured to receive an adjustment request sent by the first device; a capability determination module configured to determine a regulation capability of the first device; A data acquisition module is configured to acquire distribution network data; a control module configured to send a termination action instruction to the first device if the first device has a regulation capability and determines according to the distribution network data that the regulation request does not meet a preset control target, so that the first device terminates the regulation action and performs optimization control; The optimization control includes: when the regulation request is a voltage pre-regulation request, issuing a voltage regulation instruction to the second device so that the second device regulates the voltage to meet the voltage pre-regulation request of the first device; when the regulation request is a reactive power pre-regulation request, issuing a reactive power regulation instruction to the third device so that the third device regulates the reactive power to meet the reactive power pre-regulation request of the first device; wherein the second device or the third device determines, based on the distribution network data, that the second device is an upper-level device of the first device and has voltage regulation capability, and the third device is a lower-level device of the first device and has reactive power regulation capability.

8. A device-side control device for optimizing voltage and reactive power of a distribution network, characterized in that: include: A collection module is configured to collect operation data of the device in real time; A request module, configured to send an adjustment request to the master station if the operating data does not meet the set value; The receiving module is configured to, if the device has the adjustment capability, receive the action permission instruction issued by the master station when the master station determines that the adjustment request satisfies the preset control target, or receive the action termination instruction issued by the master station when the master station determines that the adjustment request does not satisfy the preset control target, so that the master station performs the following optimization control: when the adjustment request is a voltage pre-adjustment request, issue a voltage adjustment instruction to the second device so that the second device adjusts the voltage to meet the voltage pre-adjustment request of the first device; In the case where the regulation request is a reactive pre-regulation request, a reactive regulation instruction is issued to a third device, so that the third device regulates reactive power to meet the reactive pre-regulation request of the first device; wherein the second device or the third device determines, according to the distribution network data, that the second device is an upper-level device of the first device and has a voltage regulation capability, and the third device is a lower-level device of the first device and has a reactive regulation capability; The adjustment module is configured to adjust the operating parameters of the device according to the allow action instruction, or terminate the adjustment action according to the terminate action instruction.

9. A control system for optimizing voltage and reactive power of a distribution network, characterized in that: It comprises a master station side control device as described in claim 7 and an equipment side control device as described in claim 8, wherein the master station side control device is arranged in a substation, and there are multiple equipment side control devices, which are respectively arranged in multiple voltage and reactive devices in the distribution network, and the master station side control device is communicatively connected with the multiple equipment side control devices and can execute the control method as described in any one of claims 1-6.

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