Voltage and reactive power control and adjustment method under large-machine small-network and storage medium

Abstract

The invention provides a voltage and reactive power control and adjustment method and a storage medium under a large machine and a small network, and the method comprises the steps: determining the power generation state of each generator set and the operation state of each reactor; if at least one generator set is in a power generation state, generator end current values of all the generator sets are smaller than first preset current or generator end active power values are smaller than first preset active power, all the reactors are in a shutdown state, and the bus voltage is larger than first preset voltage, a first reactor outlet circuit breaker is controlled to be switched on, and a second reactor outlet circuit breaker is controlled to be switched off; incorporating the first reactor into the power system; if at least one generator set is in a power generation state, the generator end current values of all generator sets are smaller than a first preset voltage or the generator end active power values are smaller than a first preset active power, the first reactor is in a commissioning state, the rest reactors are all in a shutdown state, and the bus voltage is greater than the first preset voltage, the first reactor is started; and controlling the second reactor outlet circuit breaker to be switched on, and merging the second reactor into the power system.

Description

Technical Field

[0001] The present application relates to the field of power systems and automation control technology, and in particular to a voltage and reactive power control and regulation method and storage medium under large-scale machine and small-scale grid. Background Art

[0002] In the large-scale and small-network environment of Cambodia's power grid, the power grid situation is relatively complex. The Cambodian power grid has its own characteristics, such as the distribution of the highest voltage level and the composition of power sources. Taking the Sang River Second Hydropower Station as an example, many problems were exposed during its operation.

[0003] During the dry season, the power station output is low, and its transmission line has a large line distributed capacitance, which generates a large amount of excess reactive power, causing the power frequency voltage at the end of the line to increase. The generator set of the Sanhe Secondary Hydropower Station has been in the leading phase operation state for a long time. According to the monitoring data fed back by the power plant, it was in the leading phase operation from December to July of the following year, and the leading phase degree was deeper from December to April of the following year, and the leading phase degree was shallower from May to July. This leading phase operation is to maintain the voltage of the Sanhe high-voltage bus within the limit, because during this period, the Sanhe-Shangting Line and the Sanhe-Ratanakiri Line are transmitting reactive power to the Sanhe high-voltage bus.

[0004] To ensure stable operation of the system, the turbine generator sets have often been forced to operate under deep phase leading conditions for many years, which has an adverse effect on the life of the units. In order to ensure that the system voltage is stable within a certain range (such as below 240kV), multiple units are often operated in phase leading at the same time. In the dry season, due to the lack of water, the units can only operate at low load, which not only leads to low water energy utilization, but also low operating efficiency of the turbine generators.

[0005] When the phase advance of the hydro-turbine generator set is too deep, as the excitation current of the generator decreases, the no-load potential of the generator decreases, and the operating power angle increases, the stability margin of the generator decreases, and it is easy to enter the dangerous area where it cannot operate stably. In addition, when the generator is in phase advance operation, it will absorb reactive power from the system, causing the system voltage to drop. If the system capacity is small or the reactive power reserve is insufficient, the stable operation between the system and the generator will be destroyed. At the same time, when the generator is in deep phase advance operation, the change ratio of the stator end leakage flux increases, the end heats up seriously, and the temperature of the generator stator coil continues to rise. On the other hand, it will also cause the generator terminal voltage to decrease, and the plant power voltage will also decrease accordingly, which will directly affect the normal operation of the power equipment in the plant.

[0006] In addition, the reactors are currently manually switched on / off remotely or on-site during operation, and the automatic switching function has not yet been realized, nor does it have the function of analyzing and processing the reactive power data of the line. This is obviously insufficient when dealing with the complex reactive power control and regulation of the power grid. Summary of the invention

[0007] The present application aims to solve one of the technical problems in the related art at least to some extent.

[0008] To this end, the first purpose of this application is to propose a voltage and reactive power control and regulation method under large-scale machine and small-scale grid.

[0009] The second purpose of this application is to propose a voltage and reactive power control and regulation device for a large machine and a small grid.

[0010] The third objective of the present application is to provide an electronic device.

[0011] A fourth objective of the present application is to provide a computer-readable storage medium.

[0012] A fifth object of the present application is to provide a computer program product.

[0013] To achieve the above-mentioned purpose, the first embodiment of the present application proposes a voltage and reactive power control and regulation method under a large machine and a small grid, including:

[0014] Determine the power generation status of each generator set and the operation status of each reactor;

[0015] If there is at least one generator set in a power generation state and the machine-end current values ​​of all generator sets are less than a first preset current or the machine-end active power values ​​are less than a first preset active power, and all reactors are in a shutdown state, and the bus voltage is greater than a first preset voltage, the first reactor outlet circuit breaker is controlled to close, and the first reactor is incorporated into the power system;

[0016] If there is at least one generator set in the power generation state and the machine-end current values ​​of all generator sets are less than the first preset voltage or the machine-end active power values ​​are less than the first preset active power, and the first reactor is in operation and the remaining reactors are in shutdown state, and the bus voltage is greater than the first preset voltage, control the second reactor outlet circuit breaker to close, and connect the second reactor to the power system.

[0017] Optionally, determining the power generation status of each generator set includes:

[0018] Collect the terminal current value, terminal active power value, outlet circuit breaker position and main transformer high-voltage side circuit breaker position of each generator set;

[0019] If the terminal current value of a certain generator set is greater than the second preset current, and the unit outlet circuit breaker is in the closed position and the main transformer high-voltage side circuit breaker is in the closed position, it is determined that the generator set is in the power generation state; or, if the terminal active power value of the generator set is greater than the second preset active power, and the unit outlet circuit breaker is in the closed position and the main transformer high-voltage side circuit breaker is in the closed position, it is determined that the generator set is in the power generation state;

[0020] Otherwise, it is determined that the generator set is in a shutdown state.

[0021] Optionally, determining the operation status of each reactor includes:

[0022] Collect the reactive power value of each reactor and the position of the output circuit breaker;

[0023] If the reactive power value of a certain reactor is greater than the first preset reactive power and the reactor outlet circuit breaker is in the closed position, it is determined that the reactor is in operation;

[0024] Otherwise, it is determined that the reactor is in a shutdown state.

[0025] Optionally, also include:

[0026] If there is at least one generator set in the generating state, and the machine-end current values ​​of all generator sets are less than the first preset voltage or the machine-end active power values ​​are less than the first preset active power, and the first reactor is in the operating state or the second reactor is in the operating state, and the number of units in the generating state is greater than the preset number, and the bus voltage is greater than the second preset voltage, a signal for the unit to be shut down is issued to remind the on-duty attendant to apply to the dispatcher to shut down excess unloaded units to reduce the water consumption rate of the units.

[0027] To achieve the above-mentioned purpose, the second embodiment of the present application proposes a voltage and reactive power control and regulation device under a large machine and a small grid, comprising:

[0028] The status confirmation module is used to determine the power generation status of each generator set and the operation status of each reactor;

[0029] The first input module controls the closing of the first reactor outlet circuit breaker to connect the first reactor to the power system if at least one generator set is in a power generation state and the machine-end current values ​​of all generator sets are less than a first preset current or the machine-end active power values ​​are less than a first preset active power, and all reactors are in a shutdown state, and the bus voltage is greater than a first preset voltage;

[0030] The second input module is used to control the closing of the second reactor outlet circuit breaker to connect the second reactor to the power system if there is at least one generator set in the power generation state and the machine-end current values ​​of all generator sets are less than the first preset voltage or the machine-end active power values ​​are less than the first preset active power, and the first reactor is in the operation state and the remaining reactors are in the shutdown state, and the bus voltage is greater than the first preset voltage.

[0031] To achieve the above-mentioned purpose, the third aspect of the present application provides an electronic device, including: a processor, and a memory communicatively connected to the processor;

[0032] The memory stores computer-executable instructions;

[0033] The processor executes the computer-executable instructions stored in the memory to implement the method as described in any one of the first aspects.

[0034] To achieve the above-mentioned purpose, the fourth aspect of the present application proposes a computer-readable storage medium, in which computer-readable storage medium is stored computer execution instructions, and when the computer execution instructions are executed by a processor, they are used to implement the method as described in any one of the first aspects.

[0035] To achieve the above-mentioned purpose, the fifth aspect of the present application proposes a computer program product, which implements any method in the first aspect when executed by a processor.

[0036] The present application provides a voltage, reactive power control, regulation method, device, electronic device and storage medium under large-scale machine and small-scale network, which realizes real-time status monitoring and intelligent regulation of generator sets and reactors, avoids deep phase-leading operation of generator sets under low load conditions, and thus improves the operating efficiency and life of the units. At the same time, according to the changes in system voltage and power generation status, control commands such as the closing order of the reactor outlet circuit breaker can be automatically issued through the monitoring system, and the reactor can be flexibly incorporated or disconnected to realize automatic control, reduce human intervention, improve response speed and system stability, improve the system's ability to regulate reactive power, and ensure that the bus voltage is stable within a preset range. In addition, by issuing a unit shutdown signal to remind the duty officer to apply for the shutdown of excess unloaded units, the waste of water energy is reduced, the utilization efficiency of water resources is improved, and the economy and stability of the power system are further enhanced.

[0037] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0039] Figure 1 A flow chart of a voltage and reactive power control and regulation method under a large machine and a small grid provided in an embodiment of the present application;

[0040] Figure 2 A schematic diagram of the logic flow of automatic input of the reactor provided in the embodiment of the present application;

[0041] Figure 3 A schematic diagram of the logic flow of the automatic alarm shutdown of the reactor provided in the embodiment of the present application;

[0042] Figure 4 A schematic diagram of the structure of a voltage and reactive power control and regulation device under a large machine and a small grid provided in an embodiment of the present application. DETAILED DESCRIPTION

[0043] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0044] In the large-scale and small-network environment of Cambodia's power grid, the power grid situation is relatively complex. The Cambodian power grid has its own characteristics, such as the distribution of the highest voltage level and the composition of power sources. Taking the Sang River Second Hydropower Station as an example, many problems were exposed during its operation.

[0045] During the dry season, the power station output is low, and its transmission line has a large line distributed capacitance, which generates a large amount of excess reactive power, causing the power frequency voltage at the end of the line to increase. The generator set of the Sanhe Secondary Hydropower Station has been in the leading phase operation state for a long time. According to the monitoring data fed back by the power plant, it was in the leading phase operation from December to July of the following year, and the leading phase degree was deeper from December to April of the following year, and the leading phase degree was shallower from May to July. This leading phase operation is to maintain the voltage of the Sanhe high-voltage bus within the limit, because during this period, the Sanhe-Shangting Line and the Sanhe-Ratanakiri Line are transmitting reactive power to the Sanhe high-voltage bus.

[0046] To ensure stable operation of the system, the turbine generator sets have often been forced to operate under deep phase leading conditions for many years, which has an adverse effect on the life of the units. In order to ensure that the system voltage is stable within a certain range (such as below 240kV), multiple units are often operated in phase leading at the same time. In the dry season, due to the lack of water, the units can only operate at low load, which not only leads to low water energy utilization, but also low operating efficiency of the turbine generators.

[0047] When the phase advance of the hydro-turbine generator set is too deep, as the excitation current of the generator decreases, the no-load potential of the generator decreases, and the operating power angle increases, the stability margin of the generator decreases, and it is easy to enter the dangerous area where it cannot operate stably. In addition, when the generator is in phase advance operation, it will absorb reactive power from the system, causing the system voltage to drop. If the system capacity is small or the reactive power reserve is insufficient, the stable operation between the system and the generator will be destroyed. At the same time, when the generator is in deep phase advance operation, the change ratio of the stator end leakage flux increases, the end heats up seriously, and the temperature of the generator stator coil continues to rise. On the other hand, it will also cause the generator terminal voltage to decrease, and the plant power voltage will also decrease accordingly, which will directly affect the normal operation of the power equipment in the plant.

[0048] In addition, the reactors are currently manually switched on / off remotely or on-site during operation, and the automatic switching function has not yet been realized, nor does it have the function of analyzing and processing the reactive power data of the line. This is obviously insufficient when dealing with the complex reactive power control and regulation of the power grid.

[0049] In general, the prior art has the following technical problems:

[0050] 1) Insufficient status monitoring of generator sets: In hydropower stations, there is a lack of effective means to monitor the operating status of generator sets in real time, including current, power, and circuit breaker status.

[0051] 2) Power generation efficiency optimization problem: In the power system, how to optimize the power generation efficiency according to the actual operating status of the generator set is a challenge. A method is needed to determine which units should be in the power generation state and how to adjust their operation according to system demand.

[0052] 3) Low degree of automation in reactor control: The operational status of the reactor may require manual monitoring and operation, which is not only inefficient but also prone to errors.

[0053] 4) Difficulty in controlling system voltage: In the power system, maintaining a stable system voltage is a key issue. Too high or too low voltage may cause damage to the power system.

[0054] 5) Uneven distribution of resources: In the power system, there may be problems of uneven distribution of resources. For example, during certain periods of time, some units may be in an unloaded state, resulting in a waste of resources.

[0055] 6) Slow response: In the power system, the response to voltage anomalies and other situations may not be fast enough, and a fast and effective automatic control mechanism is needed to adjust the system status in time.

[0056] 7) Excessive human intervention: Existing power systems may be overly dependent on manual operations, which is not only inefficient but also susceptible to human errors.

[0057] 8) Lack of integrated monitoring system: There may be a lack of an integrated monitoring system to simultaneously monitor the status of the generator sets and reactors, as well as key parameters such as system voltage.

[0058] 9) Lack of intelligent decision support: In power systems, there may be a lack of intelligent decision support systems to help operators make quick and accurate decisions.

[0059] To address this problem, the present application provides a voltage and reactive power control and regulation method under a large machine and a small grid. Figure 1The flowchart of a voltage and reactive power control and regulation method under a large machine and small grid provided by the embodiment of the present application is as follows. Figure 1 As shown, the method comprises the following steps:

[0060] Step 101, determining the power generation status of each generator set and the operation status of each reactor.

[0061] In the embodiment of the present application, the process of determining the power generation status of each generator set is as follows:

[0062] First, the machine-end current value, machine-end active power value, outlet circuit breaker position and main transformer high-voltage side circuit breaker position of each generator set are collected.

[0063] As a possible implementation method, current sensors and power sensors are installed at the output end of each generator set to monitor the machine-end current and active power in real time, and position sensors (such as limit switches or contactors) are installed at the outlet circuit breaker and the main transformer high-voltage side circuit breaker to obtain the closing or disconnecting status of the switch. Then, each sensor is connected through a data acquisition unit (such as a PLC or embedded system), and the sensor data is received through an appropriate communication protocol (such as Modbus, CAN bus, etc.), and the data is stored in the memory. Then, the acquired data is processed to calculate the real-time power generation status of each generator set, and the processed data is transmitted to the centralized monitoring system through a network (such as Ethernet or wireless network). Finally, the machine-end current value, machine-end active power value, and the status (closing or disconnecting) of the outlet circuit breaker and the main transformer high-voltage side circuit breaker of each generator set are displayed on the monitoring system.

[0064] It should be noted that the machine-end current value, machine-end active power value, output circuit breaker position and main transformer high-voltage side circuit breaker position of each generator set can also be obtained by other means. This application does not make specific limitations on this. This application only provides a feasible method and does not serve as a specific limitation on this application.

[0065] Then, the power generation status of each generator set is judged:

[0066] If the terminal current value of a certain generator set is greater than the second preset current, and the generator set outlet circuit breaker is in the closed position and the main transformer high-voltage side circuit breaker is in the closed position, it is determined that the generator set is in the power generation state.

[0067] Alternatively, if the active power value at the generator end is greater than the second preset active power, and the generator output circuit breaker is in the closed position and the main transformer high-voltage side circuit breaker is in the closed position, it is determined that the generator set is in the power generation state.

[0068] If both of the above two judgment conditions are not met, it is determined that the generator set is in a shutdown state.

[0069] It can be understood that the second preset current and the second preset active power need to be set according to the actual scenario, and this application does not make any specific limitations on this.

[0070] In the embodiment of the present application, the process of determining the operation status of each reactor is as follows:

[0071] First, collect the reactive power value of each reactor and the position of the output circuit breaker.

[0072] It can be understood that the process of collecting reactor data can be similar to the process of collecting generator set data.

[0073] As a possible implementation method, a reactive power sensor (such as a power quality analyzer or a corresponding power measuring instrument) is installed at the output end of each reactor to monitor the reactive power of the reactor in real time, and a position sensor (such as a limit switch or a contactor) is installed at the outlet circuit breaker position of the reactor to detect the closing and disconnecting status of the circuit breaker. Then, each sensor is connected by setting a data acquisition unit (such as a PLC, an embedded system or a dedicated power monitoring device), and the sensor data is received through an appropriate communication protocol (such as Modbus, CAN bus, etc.) and stored in the memory. Then, the acquired data is processed to calculate the real-time power generation status of each generator set, and the processed data is transmitted to the centralized monitoring system through a network (such as Ethernet or wireless network). Finally, the machine-end current value, machine-end active power value, and the status (closed or disconnected) of the outlet circuit breaker and the high-voltage side circuit breaker of the main transformer are displayed on the monitoring system.

[0074] It should be noted that the reactive power value of each reactor and the output circuit breaker position can also be obtained by other means, and this application does not make specific limitations on this. This application only provides a feasible method and does not serve as a specific limitation on this application.

[0075] Then, judge the operation status of each reactor:

[0076] If the reactive power value of a certain reactor is greater than the first preset reactive power and the reactor outlet circuit breaker is in the closed position, it is determined that the reactor is in operation; otherwise, it is determined that the reactor is in shutdown.

[0077] It can be understood that the first preset reactive power needs to be set according to the actual scenario, and this application does not make any specific limitation on this.

[0078] In an embodiment of the present application, under specific conditions, such as when the current and power values ​​of the generator set are lower than specific thresholds, the operation status of the reactor, and the system voltage is higher or lower than a specific value, the system automatically controls the addition of the reactor or the shutdown of the unit to adjust the system voltage, refer to steps 102 and 103.

[0079] Step 102: If there is at least one generator set in the power generation state and the machine-end current values ​​of all generator sets are less than the first preset current or the machine-end active power values ​​are less than the first preset active power, and all reactors are in the shutdown state, and the bus voltage is greater than the first preset voltage, control the first reactor outlet circuit breaker to close, and connect the first reactor to the power system.

[0080] In this step, a logical judgment process is performed on whether the reactor is incorporated into the power system, which corresponds to the scenario where all reactors are in an outage state.

[0081] It can be understood that the first preset current, the first preset active power, and the first preset voltage need to be set according to the actual scenario, and this application does not make any specific limitations on this.

[0082] Step 103: If there is at least one generator set in the power generation state and the machine-end current values ​​of all generator sets are less than the first preset voltage or the machine-end active power values ​​are less than the first preset active power, and the first reactor is in operation and the remaining reactors are in shutdown state, and the bus voltage is greater than the first preset voltage, control the second reactor outlet circuit breaker to close and connect the second reactor to the power system.

[0083] In this step, a logical judgment process is performed on whether other reactors in the shutdown state are incorporated into the power system, which corresponds to the scenario where the first reactor is in operation and the other reactors are in the shutdown state.

[0084] It can be understood that the first preset current, the first preset active power, and the first preset voltage need to be set according to the actual scenario, and this application does not make any specific limitations on this.

[0085] It is understandable that if a certain scenario also has a third reactor, the subsequent judgment and incorporation process is as follows:

[0086] If there is at least one generator set in the power generation state and the machine-end current values ​​of all generator sets are less than the first preset voltage or the machine-end active power values ​​are less than the first preset active power, and the first reactor and the second reactor are in operation and the remaining reactors are in shutdown state, and the bus voltage is greater than the first preset voltage, control the third reactor outlet circuit breaker to close, and connect the third reactor to the power system.

[0087] Similarly, the subsequent fourth inductor and fifth inductor are similar, and this application will not repeat them.

[0088] In addition, the method proposed in this application can also perform automatic alarm for the reactor.

[0089] Specifically, for the scenario with two reactors, if there is at least one generator set in the power generation state, and the machine-end current values ​​of all generator sets are less than the first preset voltage or the machine-end active power values ​​are less than the first preset active power, and the first reactor is in the operation state or the second reactor is in the operation state, and the number of units in the power generation state is greater than the preset number, and the bus voltage is greater than the second preset voltage, a signal for the unit to be shut down is issued to remind the on-duty attendant to apply to the dispatcher to shut down excess unloaded units, so as to reduce the water consumption rate of the units, reduce resource waste and improve efficiency.

[0090] It is understandable that the preset number of units in power generation state needs to be set according to the actual scenario, and this application does not make any specific limitations on this.

[0091] In order to more clearly illustrate the process of the voltage and reactive power control and regulation method under a large machine and a small grid proposed in this application, a specific embodiment is given below for illustration. This embodiment is illustrated by taking the scenario of Sanghe 1-8 units and Shangding substation 230kV 1# reactor and 230kV 2# reactor in the Lancang River Basin as an example.

[0092] Example 1

[0093] (1)Reference Figure 2 , collect the terminal current values ​​of Sanghe 1-8 units. If the unit current is greater than 1.1%In (rated current) and the unit outlet circuit breaker is in the closed position and the main transformer high-voltage side circuit breaker is in the closed position, it is determined that the unit is in the power generation state.

[0094] In addition, the power generation state is set to 1 and the shutdown state is set to 0.

[0095] (2) Collect the active power values ​​of Sanghe 1-8 units. If the active power of the unit is greater than 1% Pn (rated active power) and the unit outlet circuit breaker is in the closed position and the main transformer high-voltage side circuit breaker is in the closed position, it is determined that the unit is in the power generation state.

[0096] In addition, the power generation state is set to 1 and the shutdown state is set to 0.

[0097] (3) By forming an “or” relationship between (1) and (2), we can obtain the units 1-8 that are currently in power generation status.

[0098] (4) Add up the number of units in power generation. For example, if units 1, 4, and 6 generate 1 MW each, 1 / 50*100%=2%Pn>1%Pn, then units 1, 4, and 6 are in power generation, and the total number of units in power generation is 3.

[0099] (5) Collect the reactive power value of the 230kV 1# reactor and the position of the 230kV 1# reactor outlet circuit breaker of Shangding Substation. When the reactive power value of the 230kV 1# reactor is greater than 80% Qn (rated reactive power) and the 230kV 1# reactor outlet circuit breaker is in the closed position, it is determined that the 230kV 1# reactor is in operation and is set to 1; otherwise, it is in the "out of operation" state and is set to 0.

[0100] (6) Collect the reactive power value of the 230kV 2# reactor of Shangding Substation and the closing position of the 230kV 2# reactor outlet circuit breaker. When the reactive power value of the 230kV 2# reactor is greater than 80% Qn (rated reactive power) and the 230kV 2# reactor outlet circuit breaker is in the closing position, it is determined that the 230kV 2# reactor is in operation and is set to 1; otherwise, it is in the "out of operation" state and is set to 0.

[0101] (7) When (1) and (2) are satisfied, that is, at least one generator set among units 1-8 is in the generating state, and the terminal current value of units 1-8 is [less than 5.5% In (rated current) or less than 5% Pn (rated active power)], and [the 230kV 1# reactor is in the shutdown state and the 230kV 2# reactor is in the shutdown state], and the system voltage (bus voltage) is greater than 240kV, the monitoring system automatically issues a closing command for the 230kV 1# reactor outlet circuit breaker, connects the 230kV 1# reactor to the system, and reduces the system voltage (putting one reactor into operation can reduce the system voltage by about 1.5kV).

[0102] (8) When (1) and (2) are satisfied, that is, at least one generator set among units 1-8 is in the generating state, and the terminal current value of units 1-8 is [less than 5.5% In (rated current) or less than 5% Pn (rated active power)], and the 230kV 1# reactor is in operation, and the system voltage (bus voltage) is greater than 240kV, the monitoring system automatically issues a closing command for the 230kV 2# reactor outlet circuit breaker, connects the 230kV 2# reactor to the system, and reduces the system voltage.

[0103] (9)Reference Figure 3 When (1) and (2) are satisfied, that is, there is at least one generator set in the 1-8 units in the generating state, and the terminal current value of the 1-8 units is [less than 5.5% In (rated current) or less than 5% Pn (rated active power)], and [(5) = 1 or (6) = 1], that is, at least one reactor is in operation, and (4) ≥ 3, that is, the total number of generating units is greater than 3, and the acquisition system voltage (bus voltage) is less than 235 kV, the monitoring system automatically sends a "unit can be shut down" signal to remind the on-duty operator to apply to the dispatcher in time to shut down the redundant unloaded units to reduce the unit water consumption rate.

[0104] In order to implement the above-mentioned embodiments, the present application also proposes a voltage and reactive power control and regulation device under a large machine and a small grid. Figure 4 The structure diagram of a voltage and reactive power control and regulation device 10 under a large machine and a small grid provided in an embodiment of the present application is shown in FIG. Figure 4 As shown, the device comprises:

[0105] The state confirmation module 100 is used to determine the power generation state of each generator set and the operation state of each reactor;

[0106] The first input module 200 controls the first reactor outlet circuit breaker to close if at least one generator set is in a power generation state and the machine-end current values ​​of all generator sets are less than a first preset current or the machine-end active power values ​​are less than a first preset active power, and all reactors are in a shutdown state, and the bus voltage is greater than a first preset voltage, so as to integrate the first reactor into the power system;

[0107] The second input module 300 is used to control the closing of the second reactor outlet circuit breaker to connect the second reactor to the power system if there is at least one generator set in the power generation state and the machine-end current values ​​of all generator sets are less than the first preset voltage or the machine-end active power values ​​are less than the first preset active power, and the first reactor is in the operation state and the remaining reactors are in the shutdown state, and the bus voltage is greater than the first preset voltage.

[0108] In order to implement the above embodiments, the present application also proposes an electronic device, comprising: a processor, and a memory communicatively connected to the processor; the memory stores computer-executable instructions; the processor executes the computer-executable instructions stored in the memory to implement the method provided by the above embodiments.

[0109] In order to implement the above embodiments, the present application also proposes a computer-readable storage medium, in which computer-executable instructions are stored. When the computer-executable instructions are executed by a processor, they are used to implement the methods provided by the above embodiments.

[0110] In order to implement the above embodiments, the present application also proposes a computer program product, including a computer program, which implements the methods provided by the above embodiments when executed by a processor.

[0111] The collection, storage, use, processing, transmission, provision and disclosure of user personal information involved in this application are in compliance with relevant laws and regulations and do not violate public order and good morals.

[0112] It should be noted that personal information from users should be collected for legitimate and reasonable purposes and should not be shared or sold outside of these legitimate uses. In addition, such collection / sharing should be carried out after receiving the user's informed consent, including but not limited to notifying the user to read the user agreement / user notice and sign the agreement / authorization including authorization of relevant user information before the user uses the function. In addition, any necessary steps should be taken to protect and safeguard access to such personal information data and ensure that others who have access to personal information data comply with its privacy policy and procedures.

[0113] The present application is expected to provide an implementation scheme for users to selectively block the use or access of personal information data. That is, the present disclosure is expected to provide hardware and / or software to prevent or block access to such personal information data. Once the personal information data is no longer needed, the risk can be minimized by limiting data collection and deleting the data. In addition, when applicable, such personal information is de-identified to protect the privacy of the user.

[0114] In the description of the aforementioned embodiments, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0115] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0116] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0117] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute the instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0118] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, multiple steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0119] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0120] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0121] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

[0122] It should be understood that the various forms of processes shown above can be used to reorder, add or delete steps. For example, the steps recorded in this application can be executed in parallel, sequentially or in different orders, as long as the expected results of the technical solution of this application can be achieved, and this document is not limited here.

[0123] The above specific implementations do not constitute a limitation on the protection scope of this application. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of this application should be included in the protection scope of this application.

Claims

1. A voltage and reactive power control and regulation method under large-scale machine and small-scale grid, characterized in that: The following steps are involved: Determine the power generation status of each generator set and the operation status of each reactor; If there is at least one generator set in a power generation state and the machine-end current values ​​of all generator sets are less than a first preset current or the machine-end active power values ​​are less than a first preset active power, and all reactors are in a shutdown state, and the bus voltage is greater than a first preset voltage, the first reactor outlet circuit breaker is controlled to close, and the first reactor is incorporated into the power system; If there is at least one generator set in the power generation state and the machine-end current values ​​of all generator sets are less than the first preset voltage or the machine-end active power values ​​are less than the first preset active power, and the first reactor is in operation and the remaining reactors are in shutdown state, and the bus voltage is greater than the first preset voltage, control the second reactor outlet circuit breaker to close, and connect the second reactor to the power system.

2. The method according to claim 1, characterized in that The step of determining the power generation status of each generator set includes: Collect the terminal current value, terminal active power value, outlet circuit breaker position and main transformer high-voltage side circuit breaker position of each generator set; If the terminal current value of a certain generator set is greater than the second preset current, and the unit outlet circuit breaker is in the closed position and the main transformer high-voltage side circuit breaker is in the closed position, it is determined that the generator set is in the power generation state; or, if the terminal active power value of the generator set is greater than the second preset active power, and the unit outlet circuit breaker is in the closed position and the main transformer high-voltage side circuit breaker is in the closed position, it is determined that the generator set is in the power generation state; Otherwise, it is determined that the generator set is in a shutdown state.

3. The method according to claim 2, characterized in that Determining the operation status of each reactor includes: Collect the reactive power value of each reactor and the position of the output circuit breaker; If the reactive power value of a certain reactor is greater than the first preset reactive power and the reactor outlet circuit breaker is in the closed position, it is determined that the reactor is in operation; Otherwise, it is determined that the reactor is in a shutdown state.

4. The method according to claim 3, characterized in that: Also includes: If there is at least one generator set in the generating state, and the machine-end current values ​​of all generator sets are less than the first preset voltage or the machine-end active power values ​​are less than the first preset active power, and the first reactor is in the operating state or the second reactor is in the operating state, and the number of units in the generating state is greater than the preset number, and the bus voltage is greater than the second preset voltage, a signal for the unit to be shut down is issued to remind the on-duty attendant to apply to the dispatcher to shut down excess unloaded units to reduce the water consumption rate of the units.

5. A voltage and reactive power control and regulation device for large-scale machine and small-scale network, characterized in that: include: The status confirmation module is used to determine the power generation status of each generator set and the operation status of each reactor; The first input module controls the closing of the first reactor outlet circuit breaker to connect the first reactor to the power system if at least one generator set is in a power generation state and the machine-end current values ​​of all generator sets are less than a first preset current or the machine-end active power values ​​are less than a first preset active power, and all reactors are in a shutdown state, and the bus voltage is greater than a first preset voltage; The second input module is used to control the closing of the second reactor outlet circuit breaker to connect the second reactor to the power system if there is at least one generator set in the power generation state and the machine-end current values ​​of all generator sets are less than the first preset voltage or the machine-end active power values ​​are less than the first preset active power, and the first reactor is in the operation state and the remaining reactors are in the shutdown state, and the bus voltage is greater than the first preset voltage.

6. An electronic device, characterized in that: include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory to implement the method according to any one of claims 1 to 4.

7. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer-executable instructions, which are used to implement the method according to any one of claims 1 to 4 when executed by a processor.

8. A computer program product, characterized in that The invention comprises a computer program, which implements the method according to any one of claims 1 to 4 when being executed by a processor.

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