Station domain level power supply gap processing and deploying method

Abstract

The invention discloses a station domain level power supply gap processing and deploying method, which overcomes the problems of difficult scheduling and poor economical efficiency of a power supply gap processing and deploying method in the prior art, and comprises the following steps: preferentially calling a main substation level adjustable distributed resource, and automatically controlling the discharge of an energy storage cluster in batches; if the power supply requirement cannot be met, adjusting the line operation mode under the main substation, and carrying out load transfer on the line; and if the line load transfer cannot meet the power supply requirement, calling the line-level gap adjustable distributed resources, and carrying out demand response. When the power supply gap of the main transformer occurs, the adjustable distributed resources, the operation mode of the distribution network line and the adjustable resources of the user side are allocated by utilizing the resources of the main transformer, the scheduling is convenient, an energy storage power supply does not need to be additionally added, the cost is saved, the power supply gap of the regional power grid is relieved, the power supply reliability is improved, and the power supply stability is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of power allocation, and in particular to a method for processing and allocating power supply gaps at a station level. Background Art

[0002] As the demand for power supply continues to increase, the scope of power shortage is also expanding. In some areas, there is a shortage of power supply and demand, and the power supply gap is getting bigger and bigger. The reason for the power supply gap is that the power supply of the system, including coal-fired units, nuclear power, gas-fired units, wind power, photovoltaic power and external power, cannot meet the load demand of the system at a certain moment.

[0003] The common measure in the power supply gap scenario is to combine the changes in supply and demand, incorporate the emergency reserve power supply that is ready for commissioning into the commissioning plan, improve the supply guarantee capability, give full play to the role of the large power grid, and achieve large-scale optimal allocation of power resources. However, traditional solutions have the problems of difficult scheduling and poor economic efficiency. Summary of the invention

[0004] The purpose of the present invention is to overcome the problems of difficult scheduling and poor economy in the power supply gap processing and allocation methods in the prior art, and provide a station-level power supply gap processing and allocation method. When a power supply gap occurs in the main transformer, its own resources are used to allocate adjustable distributed resources, distribution network line operation mode, and user-side adjustable resources. The scheduling is convenient, and no additional energy storage power supply is required, which saves costs, alleviates the power supply gap of the regional power grid, improves power supply reliability, and ensures stable power supply.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A method for handling and allocating power supply shortage at a station level, characterized by comprising the following steps: When a power supply gap occurs in the main substation, the adjustable distributed resources at the main substation level are used first to automatically control the discharge of the energy storage cluster in batches; If the power supply demand cannot be met, adjust the operation mode of the line under the main substation and transfer the load to the line; If the line load transfer cannot meet the power supply requirements, the line-level gap adjustable distributed resources will be called upon to respond to the demand.

[0006] The station-level power supply gap processing and allocation method provided by the present invention uses its own resources to solve the problem of planned load shortage initiated independently when a power supply gap occurs in the main transformer. By controlling adjustable distributed resources such as flexible direct current and energy storage, the operation mode of distribution network lines and user-side adjustable resources, the power supply gap of the regional power grid is alleviated, and there is no need to add additional energy storage power sources, which saves costs, improves power supply reliability, and ensures stable power supply.

[0007] Preferably, the adjustment of the line operation mode under the main substation includes: for overload exceeding the limit, circulating the resource equipment under the line load transfer target, integrating to form an overall overload exceeding limit control scheme combination, based on the full capacity access of distributed power sources, transferring the distributed power sources equivalent to the load, and generating a line operation mode adjustment strategy; for the line operation mode adjustment strategy within the line standard loop that has been generated, issuing a one-button remote control command, verifying and executing / restoring the generated line operation mode adjustment strategy.

[0008] Preferably, the transfer of distributed power sources equivalent to loads includes: for the target over-limit main substation, requesting topology services to obtain the associated feeders under it, sorting the feeders in sequence according to the priority of the standard ring to which the feeders belong and the feeder load conditions, and then taking the feeders as the minimum transfer unit, transferring the feeders in sequence until the overall overload limit is completely transferred out or all feeders are cycled; during this period, each time a line operation mode adjustment strategy is generated, the data section is updated, and subsequent line operation mode adjustment strategy generation is performed on the latest data section.

[0009] As a preference, centralized resources above 10kV are directly controlled by dispatching automation; for 10kV adjustable resources, when energy storage is aggregated, the short-term regulation potential of energy storage is fitted based on the characteristics of the energy storage system, combined with the short-term load characteristic prediction curve and cost; when flexible direct currents are aggregated, the active and reactive power upward adjustment margin curve and the active and reactive power downward adjustment margin curve are fitted in combination with the power control of the flexible direct currents themselves.

[0010] Preferably, calling upon line-level gap-adjustable distributed resources includes: giving priority to calling upon line energy storage to increase output, and if the power supply demand cannot be met, forwarding the remaining demand to the demand response platform for demand response.

[0011] Preferably, according to the operating characteristics of the adjustable distributed resources and in combination with the real-time measurement data of the resource equipment, the adjustment parameters of the adjustable distributed resources are calculated as a reference for adjusting the adjustable distributed resources.

[0012] Preferably, the feeders are sorted in sequence according to the priority of the standard ring to which they belong and the load of the feeders, including: feeders to which the standard ring priority is low are given priority for transfer, and feeders to which the load rate is high are given priority for transfer when the standard ring priority is the same.

[0013] Preferably, in the process of generating the line operation mode adjustment strategy, the constraint condition is that the overload of the opposite side equipment does not exceed the limit. If it is not satisfied, the line operation mode adjustment strategy is skipped.

[0014] Preferably, the load status of the resource equipment of the distribution network is monitored in real time. If a main transformer power supply gap occurs and the main transformer load rate exceeds a limit, a corresponding main transformer power supply gap processing strategy is automatically generated.

[0015] Preferably, for the target load rate threshold, the resource equipment load information is searched in the corresponding database, the load rate is calculated to form the over-limit information, and it is determined whether the load rate of the main transformer exceeds the limit.

[0016] Therefore, the present invention has the following beneficial effects: when a power supply gap occurs in the main transformer, the distribution network's own resources are used to solve the problem of planned load shortage initiated independently. By controlling adjustable distributed resources such as flexible direct current and energy storage, the operation mode of the distribution network line and the adjustable resources on the user side, the power supply gap of the regional power grid is alleviated, and there is no need to add additional energy storage power sources, which saves costs, improves power supply reliability, and ensures stable power supply. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A flowchart of the steps for handling and allocating power supply gaps at the station level.

[0018] Figure 2 This is a schematic diagram of tracing the topology information of a user in Example 3.

[0019] Figure 3 This is a schematic diagram of system data interaction in Example 4.

[0020] Figure 4 This is a schematic diagram of the topological network in Example 5. DETAILED DESCRIPTION

[0021] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Embodiment 1: like Figure 1 In the illustrated embodiment, a station-level power supply gap processing and allocation method can be seen, and its operation process is as follows: Step 1, when a power supply gap occurs in the main substation, the main substation-level adjustable distributed resources are preferentially called to automatically control the discharge of the energy storage cluster in batches; Step 2, if the power supply demand cannot be met, the operation mode of the line under the main substation is adjusted to transfer the load to the line; Step 3, if the line load transfer cannot meet the power supply requirements, the line-level gap adjustable distributed resources are called to respond to the demand.

[0022] The station-level power supply gap processing and allocation method provided in this embodiment uses its own resources to solve the problem of planned load shortage initiated independently when a power supply gap occurs in the main transformer. By controlling adjustable distributed resources such as flexible direct current and energy storage, the operation mode of distribution network lines and user-side adjustable resources, the power supply gap of the regional power grid is alleviated without the need to add additional energy storage power sources, saving costs, improving power supply reliability, and ensuring stable power supply.

[0023] like Figure 1 As shown, in this embodiment, the station-level power supply gap processing and allocation method is specifically manifested as follows: The first stage: monitoring of power supply gap and over-limit load rate of main substation.

[0024] Monitor the operating status of all resource equipment in the distribution network, and determine whether there is a power supply gap in the main substation based on the monitoring results. If so, determine whether the load rate of the main substation exceeds the limit. If so, execute the second stage.

[0025] The second stage: handling the power supply gap in the main substation.

[0026] First, the adjustable distributed resources at the substation level are adjusted. After the adjustment, it is determined whether the load rate of the main substation has returned to normal. If so, it returns to the first stage. If it still has not returned to normal, the line operation mode is adjusted. After the adjustment, it is determined whether the load rate of the main substation has returned to normal. If so, it returns to the first stage. If it still has not returned to normal, the line power supply gap module is called (the line energy storage is called first to increase the output. If it is not enough, the remaining demand is forwarded to the demand response platform, and the demand response platform responds to the demand).

[0027] The third stage: Generation of line operation mode adjustment strategy.

[0028] First, determine the target main substation, and update the data section in real time according to the overload limit to determine whether there are any remaining transferable feeders. If not, generate a line operation mode adjustment strategy. If so, sort the transferable feeder plans to obtain a single feeder transfer strategy. After adjustment, determine whether the load rate of the main substation has returned to normal. If so, generate a line operation mode adjustment strategy. If it has not returned to normal, update the data section to determine whether there are any remaining transferable feeders, and implement a cycle until the overall overload limit is fully transferred out or all feeders are cycled.

[0029] The station-level power supply gap processing and allocation method provided in this embodiment realizes the regional (main transformer) power supply gap function. When a power supply gap occurs in a region (main transformer), the distribution automation system automatically generates a corresponding main transformer power supply gap processing strategy after receiving the gap value, and gives priority to calling substation-level resources (flexible direct current, system energy storage) to adjust the load rate, and automatically controls the discharge of energy storage clusters in batches with one button. Then, through functions such as "one-click transfer", the operation mode of each line under the main transformer is adjusted, and load transfer is performed on some lines to reduce the load of the heavily overloaded main transformer. When the line load transfer still cannot meet the requirements, the line power supply gap module is called (the line energy storage is called first to increase the output, and if it is not enough, the remaining demand is forwarded to the demand response platform, and the demand response platform performs demand response).

[0030] Embodiment 2: like Figure 1In the illustrated embodiment, a station-level power supply gap processing and allocation method can be seen, and its operation process is as follows: Step 1, when a power supply gap occurs in the main substation, the main substation-level adjustable distributed resources are preferentially called to automatically control the discharge of the energy storage cluster in batches; Step 2, if the power supply demand cannot be met, the operation mode of the line under the main substation is adjusted to transfer the load to the line; Step 3, if the line load transfer cannot meet the power supply requirements, the line-level gap adjustable distributed resources are called to respond to the demand.

[0031] The technical scheme and technical effects of the present invention will be further described below through specific examples. The following examples are explanations of the present invention and the present invention is not limited to the following examples.

[0032] The station-level power supply gap processing and allocation method provided in this embodiment is defined as follows: when a power supply gap occurs in the main substation, its own resources are used to solve the planned load shortage problem initiated independently. The control objects are: adjustable distributed resources such as flexible direct current and energy storage, distribution network line operation mode, and user-side adjustable resources. The triggering method is: starting from monitoring, accepting the planned power supply gap of the main transformer, and generating / executing with one click. The constraints include that the main transformer and the line do not exceed the limit.

[0033] When a power supply gap occurs in a region (main transformer), the over-limit problem is solved by adjusting the main transformer level and flexible DC adjustable centralized energy storage resources under the region (main transformer). If the power supply gap cannot be solved, the operation mode of each line under the main transformer is adjusted, and the load is transferred to some lines, and then the line gap module under the region (main transformer) is considered to be changed for processing. Priority is given to calling the line energy storage to increase the output. If it is not enough, the remaining demand is forwarded to the demand response platform, which will respond to the demand and make adjustments.

[0034] Control scheme generation rules: (1) Regional (main transformer) power flow status monitoring; (2) Solve the power supply gap problem by adjusting the adjustable distributed resources at the main transformer level; (3) If the power supply gap problem is not solved, further adjust the line operation mode; (4) If the power supply gap limit problem is still not resolved, the line-level gap adjustable distributed resources will be further called upon.

[0035] The specific steps include: Step 1: Equipment load status monitoring.

[0036] Monitor the load status of resource equipment in the distribution network to determine whether there is a power supply gap in the main transformer. If there is a power supply gap in the main transformer, determine whether the load rate of the main transformer exceeds the limit. If the load rate of the main transformer exceeds the limit, automatically generate the corresponding main transformer power supply gap processing strategy.

[0037] The equipment load status monitoring function relies on real-time and ultra-short-term forecast data sections. According to the target load rate threshold (which can be set), it searches for equipment load information in the corresponding database and calculates the load rate to form over-limit information.

[0038] For the main grid transformer equipment, the load rate is calculated as follows: read the transformer table, obtain the transformer winding table information through the association relationship, filter out the low-voltage windings of the target monitoring voltage level, and calculate the current load rate according to "current value / rated current". According to the corresponding high-voltage winding, calculate the power load rate according to "active value / winding normal rated power".

[0039] The real-time load status monitoring function of the main transformer equipment is designed as an independent sub-module, which is resident in the DSCADA host in the corresponding monitoring area, and monitors and updates the load information of related equipment in real time and writes it into a specific table.

[0040] Step 2: Strategy for handling power supply gap of main transformer.

[0041] In this embodiment, the main transformer power supply gap processing strategy includes three steps: giving priority to calling substation-level resources to adjust distributed resources and automatically controlling the discharge of energy storage clusters in batches; if the power supply demand cannot be met, adjusting the line operation mode of the main transformer and transferring the load to the line; if the line load transfer cannot meet the power supply requirements, calling the line power supply gap module.

[0042] The specific manifestations are: (1) Adjustable distributed resource regulation (main transformer level / line level).

[0043] For the target area (main transformer) or line standard ring, relying on the equipment topology affiliation of distributed resources, controllable distributed resources such as energy storage and flexible direct current are aggregated, and their adjustable capacity information such as adjustable margin, response speed, active power characteristic curve, etc. are analyzed.

[0044] According to the regulation target and adjustable capacity, regulation control instructions are generated to remotely regulate and send the target distributed resource equipment, track and display the regulation status, display the active power changes of related equipment and the execution status of the regulation instructions, and alarm for abnormal regulation operations.

[0045] (2) Line operation mode adjustment strategy.

[0046] 1) Generation of line operation mode adjustment strategy.

[0047] The line operation mode adjustment strategy mainly relies on the topological transfer service. For overload exceeding the limit, the resource equipment under the transfer target is cycled and integrated to form an overall overload exceeding limit control solution combination. The specific logic is as follows: Considering the full capacity access of distributed power sources, the distributed power sources are equivalent to loads for transfer.

[0048] For the target overloaded main transformer requesting topology service, obtain the associated feeders under it, and sort the feeders in order according to the priority of the standard ring to which the feeders belong and the load of the feeders (the feeders to which the standard ring priority is low are given priority for transfer, and the feeders with high load rate are given priority for transfer when the standard ring priority is the same). Then, with the feeder as the minimum transfer unit, transfer the feeders in turn according to the previous transfer (ensuring that the opposite side feeder / main transformer is not overloaded) until the overall overload limit is fully transferred out or all feeders are cycled. During this period, the data section is updated every time a transfer plan is generated, and subsequent plan generation is performed on the latest data section.

[0049] During the generation of the transporter's adjustment strategy, the constraint condition is that the equipment on the opposite side is not overloaded. If this condition is not met, the plan will be skipped.

[0050] 2) Operation mode adjustment strategy verification / execution / recovery.

[0051] For the operation mode adjustment strategy within the generated line standard loop, a one-key remote control command issuing function is provided: 1. Supports the security remote control function of dual login for the operating user and the operating guardian. The two types of login account information must remain inconsistent. If all logins are not successfully completed as required, subsequent operation functions will be prohibited.

[0052] 2. Supports the verification function for the selected line operation mode adjustment plan, including verification of multiple types of information such as operation mode, operation safety, diagram and model changes, controllability of operation switches, etc. If the verification fails, the corresponding failure reason will be returned to the regional (main transformer) economic operation function interface and subsequent remote control operations will be prohibited.

[0053] 3. Support the execution / recovery function for the verified operation plan, issue the corresponding remote control instructions to the operation device in accordance with the specific content of the selected operation plan in a sequential control manner, update the remote control status in real time, and allow subsequent operations to be interrupted in case of failure. At the same time, the operation timeout limit, number of attempts and mode can be manually configured.

[0054] 4. Support the recovery function for the operations that have been attempted to be executed, generate a recovery operation sequence according to the order in which the operations were executed, and provide corresponding recovery operation functions.

[0055] The station-level power supply gap processing and allocation method provided in this embodiment uses its own resources to solve the problem of planned load shortage initiated independently when a power supply gap occurs in the main transformer. By controlling adjustable distributed resources such as flexible direct current and energy storage, the operation mode of distribution network lines and user-side adjustable resources, the power supply gap of the regional power grid is alleviated without the need to add additional energy storage power sources, saving costs, improving power supply reliability, and ensuring stable power supply.

[0056] Embodiment three: This embodiment provides a method for handling and allocating power supply gaps at a substation level, and further optimizes the method flow based on the second embodiment. The resource adjustment capacity and resource adjustable capacity in the region are analyzed to provide a reference for calling the main substation-level adjustable distributed resources and calling the line-level gap adjustable distributed resources.

[0057] Specifically include: Phase 1: Analysis of resource regulation capacity within the region.

[0058] The characteristic analysis and calculation of adjustable resources is an important basis for the distribution automation system to decompose the power supply gap demand. It is necessary to conduct in-depth research on the operating characteristics of various adjustable resources, summarize the margin calculation method of adjustable resources, and combine the real-time measurement data of resource equipment to calculate the real-time adjustable margin, downward margin, and adjustable duration of adjustable resources and write them into the database as a reference for the adjustment of each adjustable resource, so that various adjustable resources can safely, efficiently, and intelligently participate in the control and adjustment of the power supply gap mode. Taking the adjustable resource situation in a certain place as an example, hierarchical aggregation is carried out according to resources above 10kV, 10kV, and demand-side platform resources.

[0059] (1) Aggregation of adjustable resources above 10kV.

[0060] Mainly centralized energy storage, flexible direct current and other resources above 10kV, which are directly controlled by dispatching automation.

[0061] (2) 10kV adjustable resource aggregation.

[0062] For example, the 10kV adjustable resources in a certain place mainly include 10kV centralized energy storage, 10kV large users, and 10kV flexible direct current (full name: flexible direct current transmission technology, which has the advantages of fast response, independent control, and no need for converter stations. It can flexibly adjust the direction and size of power transmission to achieve rapid changes in the voltage and current of the power grid without reducing the voltage and current to zero or changing the voltage polarity to wait for insulation recovery). For 10kV large users connected through dedicated lines, power can be directly cut off for peak shaving, and the regulation potential is the total power that can be cut off. 10kV centralized energy storage has a fast response speed and can be directly controlled through dedicated lines. In the process of aggregating energy storage, the maximum power constraint of the energy storage system, the upper limit constraint of SOC, the lower limit constraint of SOC, and the number of charge and discharge times per day are fully considered. In combination with various factors such as the short-term load characteristic prediction curve and cost, shallow charging and discharge are mainly used to avoid excessive charging and discharging, and the short-term regulation potential of energy storage is fitted. During the aggregation process of 10kV flexible DC, since the flexible DC can provide active and reactive power regulation, combined with the power control of the flexible DC itself, the active and reactive power increase and decrease margin curves are fitted.

[0063] Demand-side platforms can adjust resource aggregation.

[0064] It is mainly for large users connected through public transformers, and is the load that can be directly cut off through branch switches. The regulation potential is the total power of all cuttable loads.

[0065] Phase 2: Analysis of resource adjustable capacity based on topology information.

[0066] like Figure 2 As shown, according to the customer number obtained from the demand-side platform, the user's topology information is traced. After obtaining the customer number from the marketing business application system of the demand-side platform, the distribution transformer to which the customer number belongs is traced based on the marketing PMS. Through the distribution network automation system, the feeder and 10kV outgoing line to which the customer number belongs are traced in turn. For large dedicated line users, the 10kV outgoing line to which they belong is directly traced according to the customer number. After entering the dispatching scope, the main transformer and substation to which the customer belongs are traced in turn through the dispatching automation system, and finally the marketing, distribution and dispatching data are connected.

[0067] After obtaining the dynamic mapping relationship between the above-mentioned power grid topology and load resources, the fine analysis of adjustable resources is realized based on factors such as adjustable resource response level, cost, and importance. In order to facilitate users to fully and clearly grasp the large number of scattered adjustable resource information, the adjustable capacity information of resources at different levels is analyzed from the three levels of a certain county, district, and feeder, that is, the adjustable capacity aggregation result information at different granularities.

[0068] Embodiment 4: This embodiment provides a station-level power supply gap processing and allocation method. On the basis of the second embodiment, the method process is further optimized, and data interaction is performed between various devices in the power supply gap processing and allocation to realize the station-level power supply gap processing and allocation.

[0069] In this embodiment, the station-level power supply gap processing and allocation method is applied to the station-level power supply gap processing and allocation system, and data interaction is carried out between the subsystems in the station-level power supply gap processing and allocation system, and also between the subsystems.

[0070] A station-level power supply shortage processing and dispatching system, comprising: The main transformer equipment load status monitoring system is designed as an independent sub-module, which is resident in the DSCADA host in the corresponding monitoring area, and monitors and updates the load information of related equipment in real time and writes it into a specific table. Each independent sub-module is a data acquisition device, which is installed on the resource equipment to collect data from the corresponding resource equipment.

[0071] The distribution automation system establishes a dynamic mapping relationship between the grid topology and load resources, realizes the aggregation analysis of adjustable capacity, and sends the adjustable capacity of resources to the dispatching automation system. After receiving the power supply gap information sent by the dispatching automation system, it automatically generates the corresponding main transformer power supply gap processing strategy, prioritizes the use of substation-level resources (flexible direct current, system energy storage) to adjust the load rate, and automatically controls the discharge of energy storage clusters in batches with one click. Then, through functions such as "one-click transfer", the operation mode of each line under the main transformer is adjusted, and load transfer is performed on some lines to reduce the load of the heavily overloaded main transformer. When the line load transfer still cannot meet the requirements, the line power supply gap module is called (the line energy storage is called first to increase the output, and if it is not enough, the remaining demand is forwarded to the demand response platform, and the demand response platform responds to the demand).

[0072] The dispatching automation system combines the resource adjustable capabilities sent by the distribution automation system and sends the power supply gap information to the distribution automation system.

[0073] The demand response platform responds to the remaining demand sent by the distribution automation system.

[0074] The station-level power supply shortage processing and allocation also includes: The storage unit is used to store real-time measurement data of resource equipment, power supply gap information, as well as regional resource adjustment capacity analysis program, adjustable capacity analysis program based on topology information, and line operation mode adjustment strategy generation program.

[0075] An execution unit is used to execute the station-level power supply gap processing and allocation method in Example 1 or Example 2 by running the software program and / or module stored in the memory and calling the data stored in the memory.

[0076] The display screen is used to display the current power supply gap information, the distributed resource adjustment plan, and the line operation mode adjustment plan. The display screen may include a liquid crystal display and a touch panel.

[0077] The voice unit, including a speaker, outputs an audio signal to prompt the staff when a power supply gap occurs, and automatically informs the user that the load restoration has been completed by the user after the power supply gap is restored.

[0078] The interface unit, including the I / O interface, provides an interface between the execution unit and the peripheral interface module, which may be a keyboard, a click wheel, buttons, etc. These buttons may include but are not limited to: a home button, a volume button, a start button, and a lock button.

[0079] The sensor unit includes one or more sensors. For example, the sensor assembly can detect the open / closed state of the independent submodule in the main transformer equipment load status monitoring system, and the relative positioning of the independent submodule. The sensor assembly may include a current sensor and a voltage sensor in the independent submodule, which are configured to monitor the load status of the resource equipment. The sensor assembly may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0080] The communication module is a module for data transmission between various systems. It collects data collected by independent sub-modules and obtains the communication time, communication network and communication data packets that meet the business needs in the determined application scenario; it can be understood that a two-way communication network is used. For example, a basic function of the load status monitoring system of the main transformer equipment is to edit, confirm and estimate the data and statistical information collected from the resource equipment, and at the same time ensure the integrity and accuracy of the data flow or information system flowing to the rest of the system even if the user side of the communication network fails or is interrupted.

[0081] In this embodiment, information collection is mainly realized by communication with various systems. In general, considering the construction cost and communication stability, serial physical communication is used for information transmission. The RS485 interface standard is adopted, and the data signal is transmitted in a balanced transmission mode to ensure that data can be uploaded and received based on the protocol to realize the two-way data transmission function.

[0082] The following information frames are used for data transmission: Start character + identification code + separator + control code + length + data + check code + end character.

[0083] The identification code is the unique identification information of the independent submodule, and the identification code can be used to query the database for which resource device the independent submodule collects information. The control code indicates whether the information frame is uplink data or downlink data, and the check code is the cyclic redundancy check code CRC.

[0084] In the main transformer equipment load status monitoring system, the communication network is based on the TCP / IP protocol. The data collected by the independent sub-modules are encapsulated into IP data packets and remotely transmitted to the DSCADA host over the public network for parsing, acquisition, processing and storage.

[0085] In other embodiments, if the distance between the systems is short, the communication module also includes a near field communication module to facilitate short-range communication. For example, the near field communication module can be implemented based on radio frequency identification technology, infrared data association technology, ultra-wideband technology, Bluetooth technology and other technologies.

[0086] The data for interaction in this embodiment includes: (1) Distributed resource data.

[0087] 1) Photovoltaic data.

[0088] Topological subordination of photovoltaic equipment; measured data of photovoltaic equipment: active power, reactive power, voltage, current; adjustable margin information of photovoltaic equipment; status and historical information of photovoltaic equipment; remote signaling and telemetry data of photovoltaic equipment grid connection points.

[0089] 2) Energy storage data.

[0090] Topological subordination of energy storage equipment; measured data of energy storage equipment: active power, reactive power, voltage, current; energy storage margin information of energy storage equipment; status and historical information of energy storage equipment.

[0091] 3) Flexible DC device data.

[0092] Topological dependency of flexible DC devices; measured data of flexible DC devices: active power, reactive power, voltage, current; regulation margin information of flexible DC devices; status and historical information of flexible DC devices.

[0093] (2) Intrinsic distribution network equipment information and measurement data are shown in the following table: Serial number Mainnet equipment Static model data Real-time measurement data 1 transformer Device Affiliation Active power, reactive power, current, voltage 2 breaker Device Affiliation Active power, reactive power, current, voltage, remote signaling 3 load Device Affiliation Active power, reactive power, current, voltage 4 Distribution switch Device Affiliation Active power, reactive power, current, voltage, remote signaling (3) System data interaction.

[0094] Relying on the dispatching automation system, distribution automation system and demand-side platform, based on the information interaction channel of marketing, distribution and dispatching, two-way information interaction of marketing, distribution and dispatching is realized. Figure 3 As shown in the figure, during the data uplink process, the demand-side platform transmits customer information to the distribution automation system, which analyzes the dynamic mapping relationship between the power grid topology and load resources and sends the adjustable capacity to the dispatching automation system. During the data downlink process, the dispatching automation system sends the power supply gap information to the distribution automation system, which pushes the response demand of the partition to the demand-side platform based on the refined analysis of the adjustable capacity of the partition.

[0095] 1) Uplink data.

[0096] The uplink data from the demand-side platform to the distribution automation system mainly includes customer number, customer name, rated capacity, active power, reducible active power, duration and execution results.

[0097] The uplink data from the distribution automation system to the dispatching automation system mainly includes resource aggregation information such as regional adjustable resource types and adjustable capacity.

[0098] 2) Downlink data.

[0099] The downlink data sent by the dispatching automation system to the distribution automation system mainly includes regional power supply gap data such as power supply gap time, range, and capacity.

[0100] The downlink data sent by the distribution automation system to the demand-side platform mainly includes demand response strategy data such as response target values ​​and response strategy recommendations.

[0101] Embodiment five: This embodiment provides a method for handling and allocating power supply shortages at a station level, and the method is executed by introducing a specific application scenario according to the third embodiment.

[0102] (1) Application objects: Jianshan Substation 1# main transformer (50MVA), Jianshan Substation 2# main transformer (80MVA), Jianshan Substation 3# main transformer (80MVA), which have 21 20kV lines and 13 10kV lines under their jurisdiction.

[0103] (2) Adjustable resources at the main transformer level: 1 main transformer level energy storage station (Xianxia Road energy storage station) and 1 flexible DC converter station (Phoenix converter station).

[0104] (3) Line-level adjustable resources: 4 user-level energy storage units (Bei'an Line - Hejin Electronic Energy Storage, Anjiang Line - Xinneng Microgrid Energy Storage, Tingchao Line - Haiding Mechanical Energy Storage, Huangshan Line - Jiatong Expressway Energy Storage).

[0105] Its topology network is as follows Figure 4 As shown, Jianshan transformer No. 1 main transformer is connected to the load and the flexible DC converter station respectively, Jianshan transformer No. 1 main transformer is connected to the load and is connected to Jianshan transformer No. 3 main transformer through resistor R, Jianshan transformer No. 3 main transformer is connected to the flexible DC converter station and the energy storage station respectively, and the energy storage station is connected to the load.

[0106] Application scenarios: During the peak summer period, due to continuous rain, the photovoltaic output decreased and the gap of 110kV Jianshan Substation 3# main transformer in Jianshan area of ​​a certain place was 30,000 kilowatts. Combined with the adjustable resources of a certain place, hierarchical aggregation was carried out according to the resources above 10kV, 10kV, and demand-side platform.

[0107] (1) Adjustable resources above 10 kV are directly controlled by dispatching automation.

[0108] (2) 10kV adjustable resources.

[0109] The 10kV adjustable resources in a certain area mainly include 10kV centralized energy storage, large users, and flexible direct current. For 10kV large users accessed through dedicated lines, the power can be directly cut off for peak shaving, and the regulation potential is the total power that can be cut off. The 10kV centralized energy storage has a fast response speed and can be directly controlled through a dedicated line. In the process of aggregating energy storage, the constraints such as the maximum power constraint of the energy storage system for charging and discharging, the upper limit constraint of SOC, the lower limit constraint of SOC, and the number of charging and discharging times per day are fully considered. In addition, various factors such as the short-term load characteristic prediction curve and cost are combined, and shallow charging and discharging are mainly used to avoid excessive charging and discharging, and the short-term regulation potential of energy storage is fitted. Flexible direct current can provide active and reactive power regulation. Combined with the power control of the flexible direct current itself, the active and reactive power upward and downward adjustment margin curves are fitted.

[0110] (3) The adjustable resource adjustment potential of the demand-side platform is the total power of all cuttable loads.

[0111] In the specific implementation, the dispatcher adopts the station-level power supply gap processing and allocation method provided in Example 2 or Example 3. After executing the accident plan with one click through the dispatching technical support system and the distribution automation system, the estimated gap of the 3# main transformer of Jianshan Substation is 30,000 kilowatts. The distribution automation system intelligently forms the optimal strategy based on the grid topology and load resources, and adjusts the substation-level resources (flexible direct current, system energy storage, aggregator energy storage, etc.) in turn. It automatically controls the discharge of energy storage clusters in batches with one click. The distribution automation first adjusts the operation mode (one-click transfer), and if it is not enough, the line plan gap module is called (the line energy storage is called first to increase the output, and if it is not enough, the remaining demand is forwarded to the demand response platform, and the demand response platform responds to the demand). And notify the user to reduce the load through the demand side platform. After the power supply gap is restored, according to the one-click power restoration instruction of the control center, the customer is automatically notified to complete the load recovery by himself.

[0112] The above-described embodiment is only a preferred solution of the present invention and does not limit the present invention in any form. There are other variations and modifications without exceeding the technical solution described in the claims.

Claims

1. A method for handling and allocating power supply shortage at a station level, characterized in that: include: Prioritize the use of main substation-level adjustable distributed resources and automatically control the discharge of energy storage clusters in batches; If the power supply demand cannot be met, adjust the operation mode of the line under the main substation and transfer the load to the line; If the line load transfer cannot meet the power supply requirements, the line-level gap adjustable distributed resources will be called upon to respond to the demand.

2. A method for handling and allocating power supply shortages at a station level according to claim 1, characterized in that: The adjustment of the line operation mode under the main substation includes: for overload exceeding the limit, circulating the resource equipment under the line load transfer target, integrating to form an overall overload exceeding limit control solution combination, based on the full capacity access of distributed power sources, transferring the distributed power sources equivalent to the load, and generating a line operation mode adjustment strategy; for the line operation mode adjustment strategy within the line standard loop that has been generated, issuing a one-button remote control command, and verifying and executing / restoring the generated line operation mode adjustment strategy.

3. A method for handling and allocating power supply shortages at a station level according to claim 2, characterized in that: The method of transferring the distributed power supply equivalent to the load includes: requesting the topology service for the target over-limit main substation to obtain the associated feeders under it, sorting the feeders in sequence according to the priority of the standard ring to which the feeders belong and the feeder load conditions, and then taking the feeders as the minimum transfer unit, transferring the feeders in sequence until the overall overload limit is completely transferred out or all feeders are cycled; during this period, each time a line operation mode adjustment strategy is generated, the data section is updated, and subsequent line operation mode adjustment strategy generation is performed on the latest data section.

4. A method for handling and allocating power supply shortage at a station level according to claim 1, characterized in that: For concentrated resources above 10kV, direct control is carried out using dispatching automation. For 10kV adjustable resources, when energy storage is aggregated, the short-term regulation potential of energy storage is fitted based on the characteristics of the energy storage system, combined with the short-term load characteristic prediction curve and cost. When flexible direct currents are aggregated, the active and reactive power upward adjustment margin curve and the active and reactive power downward adjustment margin curve are fitted in combination with the power control of the flexible direct currents themselves.

5. A method for handling and allocating power supply shortage at a station level according to claim 1, 2 or 4, characterized in that: Calling on line-level gap adjustable distributed resources includes: giving priority to calling on line energy storage to increase output. If the power supply demand cannot be met, the remaining demand will be forwarded to the demand response platform for demand response.

6. A method for handling and allocating power supply shortage at a station level according to claim 5, characterized in that: According to the operating characteristics of the adjustable distributed resources and combined with the real-time measurement data of the resource equipment, the adjustment parameters of the adjustable distributed resources are calculated as a reference for adjusting the adjustable distributed resources.

7. A method for handling and allocating power supply shortage at a station level according to claim 2 or 3, characterized in that: During the generation of the line operation mode adjustment strategy, the constraint condition is that the overload of the opposite side equipment does not exceed the limit. If it is not satisfied, the line operation mode adjustment strategy is skipped.

8. A method for handling and allocating power supply shortages at a station level according to claim 3, characterized in that: The feeders are sorted in sequence according to the priority of the standard ring to which the feeders belong and the load conditions of the feeders, including: feeders to which the standard ring priority is low are given priority in transfer, and feeders to which the load rate is high are given priority in transfer when the standard ring priority is the same.

9. A method for handling and allocating power supply shortage at a station level according to claim 1, 2 or 4, characterized in that: The load status of the resource equipment in the distribution network is monitored in real time. If a main transformer power supply gap occurs and the main transformer load rate exceeds the limit, the corresponding main transformer power supply gap processing strategy is automatically generated.

10. A method for handling and allocating power supply shortage at a station level according to claim 9, characterized in that: For the target load rate threshold, search and obtain resource equipment load information in the corresponding database, calculate the load rate to form the over-limit information, and determine whether the main transformer load rate exceeds the limit.

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