Unit reactive power output measurement method and apparatus, and computer device

Abstract

The present application relates to a unit reactive power output measurement method. The method comprises: when it is confirmed that the bus voltage in a power system falls within a preset voltage range, starting a first unit in the power system and adjusting same to a stable power generation state, and starting a second unit in the power system and adjusting same to power generation synchronous condensing; gradually increasing the reactive power output of the first unit, and when it is detected that power data of the power system exceeds a corresponding limit range in a measurement boundary condition, stopping increasing the reactive power output of the first unit, and starting to gradually increase the leading reactive power capacity of the second unit; when the leading reactive power capacity of the second unit reaches an under-excitation limiting condition, maintaining the leading reactive power capacity of the second unit for stable operation, and gradually increasing the lagging reactive power capacity of the first unit; and when it is detected that the power data of the power system reaches the measurement boundary condition, measuring the current reactive power output of the first unit and the current reactive power output of the second unit. The method can improve the accuracy of unit reactive power output measurement.

Description

Method, device and computer equipment for measuring reactive output of unit Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a method, device, computer equipment, storage medium and computer program product for measuring reactive output of a unit. Background Art

[0002] Reactive power output is a crucial factor in maintaining voltage stability in power systems. The reactive power output capability of a storage power plant's generator sets directly impacts the system's voltage level. By verifying the actual reactive power output capability of a storage power plant's generator sets, we can ensure they can provide sufficient reactive power to maintain grid voltage stability.

[0003] Currently, the power factor of a generator set is typically calculated by measuring the phase difference between its voltage and current. The reactive output is then inferred by adjusting the excitation voltage and using the power factor. However, this reactive output estimation method is susceptible to system voltage fluctuations, distortion of the voltage and current waveforms during measurement, harmonics, and other factors, resulting in inaccurate reactive output measurements. Summary of the Invention

[0004] Based on this, it is necessary to provide a method, device, computer equipment, computer-readable storage medium and computer program product for measuring reactive power of a unit, which can improve the accuracy of reactive power measurement of the unit, in order to address the above technical problems.

[0005] In a first aspect, the present application provides a method for measuring reactive power output of a generator set. The method comprises:

[0006] When confirming that the bus voltage in the power system is within a preset voltage range, starting the first unit in the power system and adjusting it to a steady-state power generation state, and starting the second unit in the power system and adjusting it to a power generation phase adjustment state;

[0007] gradually increasing the reactive output of the first generator set, and when detecting that power data of the power system exceeds a limit range corresponding to a preset measurement boundary condition, stopping increasing the reactive output of the first generator set and starting to gradually increase the reactive phase-leading capacity of the second generator set; the power data includes the system voltage; wherein increasing the reactive phase-leading capacity of the second generator set is used to reduce the system voltage;

[0008] When the reactive leading phase capacity of the second generator set reaches the under-excitation limit condition, the reactive leading phase capacity of the second generator set is maintained in stable operation, and the reactive lagging phase capacity of the first generator set is gradually increased;

[0009] When it is detected that the power data of the power system reaches the measurement boundary condition, the current reactive output of the first unit and the current reactive output of the second unit are measured.

[0010] In one embodiment, gradually increasing the reactive output of the first unit includes:

[0011] When it is detected that the power data of the power system does not meet the measurement boundary condition, gradually increasing the reactive output of the first unit according to a preset step size until the reactive output of the first unit is increased to an intermediate value;

[0012] The intermediate value is determined according to the rated active power of the first unit.

[0013] In one embodiment, after increasing the reactive output of the first unit to an intermediate value, the method further includes:

[0014] When the reactive output of the first generator set increases to an intermediate value, detecting power data of the power system;

[0015] If it is detected that the power data of the power system is still within the limit range corresponding to the measurement boundary conditions, the reactive output of the first unit will continue to be gradually increased according to the preset step size until the reactive output of the first unit is increased to a maximum value; the maximum value is determined based on the maximum phase delay of the first unit.

[0016] In one embodiment, when it is detected that the power data of the power system reaches the measurement boundary condition, measuring the current reactive output of the first unit and the current reactive output of the second unit includes:

[0017] In the process of maintaining the reactive leading phase capacity of the second generator set in stable operation and gradually increasing the reactive lagging phase capacity of the first generator set, detecting whether the power data of the power system meets the measurement boundary condition;

[0018] If it is detected that the power data of the power system reaches the measurement boundary condition, stopping increasing the reactive delayed phase capacity of the first unit to maintain stable operation of the first unit;

[0019] After the first unit and the second unit operate stably for a preset period of time, the current reactive output of the first unit and the current reactive output of the second unit are measured.

[0020] In one embodiment, starting the first unit and adjusting it to a steady-state power generation state, and starting the second unit and adjusting it to a power generation phase adjustment state, include:

[0021] Start the first unit and the second unit;

[0022] adjusting the active output of the first unit to a preset active output rated value and adjusting the reactive output of the first unit to zero according to a preset step size; the preset active output rated value is a positive number;

[0023] According to the preset step size, the active output of the second unit is adjusted to zero, and the reactive output of the second unit is adjusted to a preset reactive output rated value; the preset reactive output rated value is a negative number.

[0024] In one embodiment, the method further comprises:

[0025] During the process of starting up the first generator set and adjusting it to a steady-state power generation state, and starting up the second generator set and adjusting it to a power generation phase adjustment state, if it is detected that the bus voltage does not exceed the bus voltage lower limit in the measurement boundary condition, then adjusting the reactive output and active output of the second generator set is stopped to maintain stable operation of the second generator set;

[0026] After monitoring that the second unit operates stably for a preset period of time, the reactive output of the first unit and the reactive output of the second unit are measured.

[0027] In one embodiment, when it is detected that the power data of the power system reaches the measurement boundary condition, after measuring the current reactive output of the first unit and the current reactive output of the second unit, the method further includes:

[0028] Restoring the reactive output of the first unit and the reactive output of the second unit to initial values;

[0029] The loads of the first unit and the second unit are adjusted according to the current reactive output of the first unit and the current reactive output of the second unit.

[0030] In one embodiment, the measurement boundary conditions include the boundary range of the system voltage in the power system, the voltage boundary range of the outlet voltage of the first unit, the voltage boundary range of the outlet voltage of the second unit, the voltage boundary range of the unit power supply system in the power system, the current boundary range of the stator current of the generator in the power system, the current boundary range of the rotor current of the generator in the power system, the operating status and temperature rise range of the generator cooling system in the power system, and the vibration range of the generator set shaft system in the power system.

[0031] In a second aspect, the present application also provides a device for measuring reactive power output of a generator set. The device comprises:

[0032] a unit startup module, configured to, upon confirming that the bus voltage in the power system is within a preset voltage range, start the first unit in the power system and adjust it to a steady-state power generation state, and start the second unit in the power system and adjust it to a power generation phase modulation state;

[0033] a reactive power increasing module, configured to gradually increase the reactive output of the first generator set, and when detecting that power data of the power system exceeds a limit range corresponding to a preset measurement boundary condition, stop increasing the reactive output of the first generator set and begin gradually increasing the reactive phase leading capacity of the second generator set; the power data includes the system voltage; wherein increasing the reactive phase leading capacity of the second generator set is used to reduce the system voltage;

[0034] a reactive power debugging module, configured to maintain the reactive power leading capacity of the second generator set in stable operation and gradually increase the reactive power lagging capacity of the first generator set when the reactive power leading capacity of the second generator set reaches an under-excitation limit condition;

[0035] The reactive power measurement module is used to measure the current reactive power output of the first unit and the current reactive power output of the second unit when it is detected that the power data of the power system reaches the measurement boundary condition.

[0036] In a third aspect, the present application further provides a computer device. The computer device includes a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the following steps are performed:

[0037] When confirming that the bus voltage in the power system is within a preset voltage range, starting the first unit in the power system and adjusting it to a steady-state power generation state, and starting the second unit in the power system and adjusting it to a power generation phase adjustment state;

[0038] gradually increasing the reactive output of the first generator set, and when detecting that power data of the power system exceeds a limit range corresponding to a preset measurement boundary condition, stopping increasing the reactive output of the first generator set and starting to gradually increase the reactive phase-leading capacity of the second generator set; the power data includes the system voltage; wherein increasing the reactive phase-leading capacity of the second generator set is used to reduce the system voltage;

[0039] When the reactive leading phase capacity of the second generator set reaches the under-excitation limit condition, the reactive leading phase capacity of the second generator set is maintained in stable operation, and the reactive lagging phase capacity of the first generator set is gradually increased;

[0040] When it is detected that the power data of the power system reaches the measurement boundary condition, the current reactive output of the first unit and the current reactive output of the second unit are measured.

[0041] In a fourth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the following steps:

[0042] When confirming that the bus voltage in the power system is within a preset voltage range, starting the first unit in the power system and adjusting it to a steady-state power generation state, and starting the second unit in the power system and adjusting it to a power generation phase adjustment state;

[0043] gradually increasing the reactive output of the first generator set, and when detecting that power data of the power system exceeds a limit range corresponding to a preset measurement boundary condition, stopping increasing the reactive output of the first generator set and starting to gradually increase the reactive phase-leading capacity of the second generator set; the power data includes the system voltage; wherein increasing the reactive phase-leading capacity of the second generator set is used to reduce the system voltage;

[0044] When the reactive leading phase capacity of the second generator set reaches the under-excitation limit condition, the reactive leading phase capacity of the second generator set is maintained in stable operation, and the reactive lagging phase capacity of the first generator set is gradually increased;

[0045] When it is detected that the power data of the power system reaches the measurement boundary condition, the current reactive output of the first unit and the current reactive output of the second unit are measured.

[0046] In a fifth aspect, the present application further provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the following steps:

[0047] When confirming that the bus voltage in the power system is within a preset voltage range, starting the first unit in the power system and adjusting it to a steady-state power generation state, and starting the second unit in the power system and adjusting it to a power generation phase adjustment state;

[0048] gradually increasing the reactive output of the first generator set, and when detecting that power data of the power system exceeds a limit range corresponding to a preset measurement boundary condition, stopping increasing the reactive output of the first generator set and starting to gradually increase the reactive phase-leading capacity of the second generator set; the power data includes the system voltage; wherein increasing the reactive phase-leading capacity of the second generator set is used to reduce the system voltage;

[0049] When the reactive leading phase capacity of the second generator set reaches the under-excitation limit condition, the reactive leading phase capacity of the second generator set is maintained in stable operation, and the reactive lagging phase capacity of the first generator set is gradually increased;

[0050] When it is detected that the power data of the power system reaches the measurement boundary condition, the current reactive output of the first unit and the current reactive output of the second unit are measured.

[0051] The above-mentioned method, device, computer equipment, storage medium and computer program product for measuring the reactive output of the unit, when confirming that the bus voltage in the power system meets the preset voltage range, starts up the first unit in the power system and adjusts it to the steady state of power generation, and starts up the second unit in the power system and adjusts it to the phase-adjusted power generation; gradually increases the reactive output of the first unit, and when it is detected that the power data of the power system exceeds the corresponding limit range in the preset measurement boundary conditions, stops increasing the reactive output of the first unit, and starts to gradually increase the reactive leading capacity of the second unit; the power data includes the system voltage; wherein, increasing the reactive leading capacity of the second unit is used to reduce the system voltage; when the reactive leading capacity of the second unit reaches the under-excitation limit condition, maintains the reactive leading capacity of the second unit in stable operation, and starts to gradually increase the reactive lagging capacity of the first unit; when it is detected that the power data of the power system reaches the measurement boundary conditions, measures the current reactive output of the first unit and the current reactive output of the second unit. By adopting this method, the maximum reactive output of the unit when the measurement boundary conditions are reached is measured through the different load conditions of the unit during delayed phase operation and advanced phase operation, thereby improving the accuracy of the reactive output measurement of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] FIG1 is a schematic flow chart of a method for measuring reactive output of a generator set according to an embodiment;

[0053] FIG2 is a flow chart of the steps of increasing the reactive output of the first unit to a maximum value in one embodiment;

[0054] FIG3 is a flow chart showing the steps of measuring the current reactive output of the first unit and the current reactive output of the second unit in one embodiment;

[0055] FIG4 is a schematic flow chart of a method for measuring reactive output of a generator set according to another embodiment;

[0056] FIG5 is a structural block diagram of a reactive output measurement device for a generator set according to an embodiment;

[0057] FIG6 is a diagram showing the internal structure of a computer device in one embodiment. DETAILED DESCRIPTION

[0058] In order to make the purpose, technical solutions and advantages of this application more clear, the following further describes this application in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this application and are not intended to limit this application.

[0059] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0060] In one embodiment, as shown in FIG1 , a method for measuring the reactive output of a generator set is provided. This embodiment uses the method applied to a terminal as an example for illustration. It is understandable that the method can also be applied to a server, or to a system including a terminal and a server, and implemented through the interaction between the terminal and the server. The terminal and the server refer to terminal devices and servers in a power system that can adjust parameters such as the active output, reactive output, and voltage of the generator set. In this embodiment, the method includes the following steps:

[0061] In step S101, when it is confirmed that the bus voltage in the power system meets the preset voltage range, the first unit in the power system is started and adjusted to a steady-state power generation state, and the second unit in the power system is started and adjusted to a power generation phase adjustment state.

[0062] The first unit and the second unit may be generator sets in the power system of the energy storage power station, used to generate electricity to supply to various devices and the power grid.

[0063] Among them, the preset voltage range refers to the preliminary range set for the bus voltage before starting the measurement; the preset voltage range should be lower than the bus voltage upper limit in the measurement boundary conditions; for example, if the bus voltage upper limit value in the measurement boundary conditions is set to 240kV, the preset voltage range can be set to 220kV to 233kV.

[0064] Specifically, the measurement time period can be selected during the peak load period of the power system, and measurements can be avoided as much as possible during the peak and valley periods of the power grid load, so as to accurately measure the actual capacity of the reactive power output of the energy storage power station unit during the peak period, so as to ensure that a stable and reliable voltage can be delivered during the peak power consumption period. During the peak load period of the power system, the terminal checks the voltage of the 220kV bus in the power system to ensure that the 220kV bus voltage is not higher than 233kV before executing the measurement step. When the 220kV bus voltage meets the preset voltage range (for example, not higher than 233kV), the first unit is started and adjusted to the steady state of power generation, and the second unit is started and adjusted to the power generation phase adjustment. If the bus voltage is higher than 233kV, the power system regulates the surrounding nearby plant units or capacitor banks to ensure that the bus voltage is maintained within 220kV to 233kV.

[0065] Step S102, gradually increasing the reactive output of the first unit. When it is detected that the power data of the power system exceeds the corresponding limit range in the preset measurement boundary conditions, stopping increasing the reactive output of the first unit and starting to gradually increase the reactive leading capacity of the second unit; the power data includes the system voltage; wherein, increasing the reactive leading capacity of the second unit is used to reduce the system voltage of the power system.

[0066] Among them, the reactive phase-leading capacity refers to the reactive power absorbed by the unit during phase-leading operation.

[0067] The measurement boundary conditions refer to the operating conditions set for the reactive output measurement experiment of the unit. The measurement boundary conditions include the data range and status standards of different power data (including) in the power system. It can be understood that when all sub-conditions in the measurement boundary conditions are met, the power data of the power system can be considered to have met the measurement boundary conditions; when any power data exceeds the data range in the measurement boundary conditions, it can be considered that the power data of the power system exceeds the measurement boundary conditions.

[0068] Among them, the power data includes the export voltage of the first and second units, 220kV bus voltage, 10kV system bus voltage for auxiliary power, 400V system voltage for auxiliary power, stator current, rotor current, operating status and temperature rise range of the generator cooling system, and generator set shaft vibration, etc.

[0069] Specifically, the reactive output of the first unit is gradually increased to the intermediate value. During this process, the terminal monitors in real time whether various power data in the power system (such as the first unit, bus voltage, etc.) exceed the limit value in the measurement boundary conditions; if it does not exceed the limit value in the measurement boundary conditions, the reactive output of the first unit is gradually increased from the intermediate value to the maximum value; if it exceeds the limit value in the measurement boundary conditions, there is no need to continue to gradually increase the reactive output of the first unit to the maximum value. Whether in the process of gradually increasing to the intermediate value or gradually increasing to the maximum value, when it is detected that any power data in the power system exceeds the limit value in the measurement boundary condition, for example, it is detected that the export voltage of the first unit is greater than or equal to the limit value of the voltage boundary range of the export voltage of the first unit in the preset measurement boundary condition (for example, 16.54kV), or it is detected that the bus voltage is greater than or equal to the limit value of the voltage boundary range of the 220kV bus voltage in the measurement boundary condition (for example, 240kV), then the increase in the reactive output of the first unit is stopped, and the second unit is operated in phase leading mode instead, that is, the reactive phase leading capacity of the second unit is gradually increased to reduce the system voltage of the power system, for example, the export voltage of the first unit in the power system can be reduced or the 220kV bus voltage can be reduced.

[0070] In practical applications, the upper and lower limits of the outlet voltages of the first and second units can be set according to the rated voltages; for example, the outlet voltage of the units in the measurement boundary conditions is maintained at 95% to 105% of the rated voltage (the rated voltage of the generator is 15.75 kV), that is, the outlet voltage of the units in the measurement boundary conditions should be maintained at 14.96 kV to 16.5375 kV (or 14.96 kV to 16.54 kV).

[0071] Step S103: When the reactive leading capacity of the second unit reaches the under-excitation limit condition, the reactive leading capacity of the second unit is maintained in stable operation, and the reactive lagging capacity of the first unit is gradually increased.

[0072] Among them, the under-excitation limit condition refers to the protection condition set to prevent the excitation system of the generator set in the power system from being unable to provide sufficient reactive power to maintain the voltage stability of the system.

[0073] Among them, the reactive power generated by the reactive delayed phase capacity group during delayed phase operation.

[0074] Specifically, when the reactive leading capacity of the second unit increases to the under-excitation limit condition, the second unit is kept stable in operation at the reactive leading capacity. At this time, the first unit begins to continue to increase the reactive lagging capacity. The reactive power corresponding to the reactive lagging capacity when the preset measurement boundary condition is reached is the maximum lagging capacity of the first unit, thereby realizing accurate measurement of the maximum lagging capacity of the first unit.

[0075] Step S104 : When it is detected that the power data of the power system reaches a measurement boundary condition, the current reactive output of the first unit and the current reactive output of the second unit are measured.

[0076] Among them, the current reactive output is the maximum reactive output capacity that the unit can achieve during peak load.

[0077] Specifically, after reducing the power data of the power system, if it is detected that the power data of the power system reaches the measurement boundary conditions again, the preset operating time will continue to be run, and then the current active output, reactive output, machine terminal voltage, bus voltage value, 10kV plant power voltage, 400V plant power voltage, as well as generator stator current, rotor excitation current, temperature rise of each part and unit swing data of the first unit and the second unit will be measured and stored.

[0078] In the above-mentioned method for measuring reactive output of a generator set, upon confirming that the bus voltage in the power system meets a preset voltage range, the first generator set in the power system is started and adjusted to a steady-state power generation state, and the second generator set in the power system is started and adjusted to a phase-shifted power generation state; the reactive output of the first generator set is gradually increased; and when it is detected that the power data of the power system exceeds the limit range corresponding to the preset measurement boundary conditions, the reactive output of the first generator set is stopped from being increased, and the reactive leading capacity of the second generator set is gradually increased; the power data includes the system voltage; wherein the reactive leading capacity of the second generator set is increased to reduce the system voltage; when the reactive leading capacity of the second generator set reaches the underexcitation limit condition, the reactive leading capacity of the second generator set is maintained at a stable operation, and the reactive lagging capacity of the first generator set is gradually increased; when it is detected that the power data of the power system reaches the measurement boundary conditions, the current reactive output of the first generator set and the current reactive output of the second generator set are measured. Using this method, the maximum reactive output of the generator set when the measurement boundary conditions are met is measured by taking into account the different load conditions of the generator set during lagging and leading operation, thereby improving the accuracy of the reactive output measurement of the generator set.

[0079] In one embodiment, the above-mentioned step S102, gradually increasing the reactive output of the first unit, specifically includes the following contents: when it is detected that the power data of the power system does not meet the measurement boundary conditions, gradually increasing the reactive output of the first unit according to a preset step size until the reactive output of the first unit is increased to an intermediate value.

[0080] The intermediate value is determined based on the rated active power of the first unit. In practical applications, if the rated power factor of the energy storage power station unit is 0.9, the intermediate value of the reactive output can be 43% of the rated active power. For example, the intermediate value of the reactive output of the first unit can be 129 MVar.

[0081] The preset step size refers to a preset increase / decrease step size for reactive power output. The preset step size can be set to 10 MVar.

[0082] After the above step S101 completes the adjustment of the steady-state power generation of the first unit and the power generation phase adjustment of the second unit, the reactive output of the first unit is first increased to an intermediate value. Specifically, the terminal gradually increases the reactive output of the first unit in the steady-state power generation state according to a preset step size of 10MVar. During this period, the terminal monitors the power data of the power system in real time, for example, monitoring whether the power data such as the outlet voltage and bus voltage of the first unit and the second unit exceed the limit value in the measurement boundary condition. If the power data of the power system does not exceed the limit value in the measurement boundary condition, the reactive output of the first unit continues to be gradually increased according to the preset step size. If any one of the power data exceeds the limit value in the measurement boundary condition, the current reactive output of the first unit and the current reactive output of the second unit are measured according to the above steps S102 to S104, and the current reactive output is the maximum reactive output capacity of the unit.

[0083] In this embodiment, the reactive output of the first unit is gradually increased to an intermediate value according to a preset step size. At the same time, the power data of the power system is detected in real time to see whether they have reached the measurement boundary conditions, so as to measure whether the power system will reach the measurement boundary conditions in the process of increasing the reactive output to the intermediate value, and then measure the maximum reactive output capacity of the first unit and the second unit in the power system.

[0084] In one embodiment, as shown in FIG2 , after increasing the reactive output of the first unit to an intermediate value, the method further includes:

[0085] Step S201: When the reactive output of the first unit increases to an intermediate value, power data of the power system is detected.

[0086] Step S202: If it is detected that the power data of the power system is still within the limit range corresponding to the measurement boundary condition, the reactive output of the first unit is gradually increased according to the preset step size until the reactive output of the first unit is increased to the maximum value.

[0087] The maximum value is determined based on the maximum delayed phase capability of the first unit. In practice, the rated capacity of the pumped storage power station unit is 334 MVA, the rated power is 300 MW, and the rated maximum delayed phase capability is approximately 146 MVar. Therefore, the maximum reactive output of the first unit is 146 MVar.

[0088] Specifically, if the reactive output of the first unit increases to the intermediate value, but there is still no power data exceeding the corresponding limit in the measurement boundary condition, for example, if the output voltage of the first unit is detected to be less than the output voltage upper limit in the preset measurement boundary condition, or if the bus voltage is detected to be less than the bus voltage upper limit in the measurement boundary condition, then the terminal can continue to gradually increase the reactive output of the first unit according to the above-mentioned preset step size of 10MVar. During this period, the terminal monitors in real time whether the power data such as the first unit, the second unit and the bus voltage exceed the limit in the measurement boundary condition. If none of the power data exceeds the corresponding limit in the measurement boundary condition, then the reactive output of the first unit continues to be gradually increased according to the preset step size until the reactive output of the first unit increases to the maximum value. If there is any power data exceeding the corresponding limit in the measurement boundary condition, then the current reactive output of the first unit and the current reactive output of the second unit are measured according to the above-mentioned steps S102 to S104, and the current reactive output is the maximum reactive output capacity of the unit.

[0089] In this embodiment, the reactive output of the first unit is gradually increased from the intermediate value to the maximum value according to a preset step size, and at the same time, the power data of the power system is detected in real time to see whether the measurement boundary conditions are met, so as to measure whether the measurement boundary conditions are met in the process of the reactive output increasing from the intermediate value to the maximum value, and then the maximum reactive output capacity of the first unit and the second unit is measured.

[0090] In one embodiment, as shown in FIG3 , the above step S104, when it is detected that the power data of the power system reaches the measurement boundary condition, measures the current reactive output of the first unit and the current reactive output of the second unit, specifically including the following:

[0091] Step S301 , while maintaining the reactive leading capacity of the second unit in stable operation and gradually increasing the reactive lagging capacity of the first unit, detect whether the power data of the power system meets the measurement boundary conditions.

[0092] Step S302: If it is detected that the power data of the power system reaches the measurement boundary condition, then the increase of the reactive delayed phase capacity of the first unit is stopped to maintain the stable operation of the first unit.

[0093] Step S303 : After the first unit and the second unit have been stably operating for a preset period of time, the current reactive output of the first unit and the current reactive output of the second unit are measured.

[0094] Specifically, in the process of maintaining the reactive leading capacity of the second unit in stable operation and gradually increasing the reactive lagging capacity of the first unit, the terminal will detect in real time whether the various power data of the power system (such as active output, reactive output, terminal voltage, bus voltage, 10kV plant power voltage, 400V plant power voltage, as well as generator stator current, rotor excitation current, temperature rise of various parts and unit swing data, etc.) have reached the measurement boundary conditions. If the various power data of the power system have reached the boundary conditions, the terminal will increase the reactive lagging capacity of the first unit to maintain the stable operation of the first unit. After the first and second units have been operating stably for a preset period of time (for example, 5 minutes), the terminal measures the current reactive output of the first unit and the current reactive output of the second unit and other various power data and stores them.

[0095] In this embodiment, while maintaining the stable operation of the reactive leading capacity of the second unit, the reactive lagging capacity of the first unit is gradually increased; if it is detected that all power data of the power system have reached the measurement boundary conditions, the increase of the reactive lagging capacity of the first unit is stopped to maintain the stable operation of the first unit; and after the first unit and the second unit have been stably operating for a preset period of time, the current reactive output of the first unit and the current reactive output of the second unit are measured, thereby realizing the measurement of the maximum reactive output capacity of the generator set of the energy storage power station, and will not be affected by the fluctuations of the voltage and current waveforms, thereby improving the accuracy of the reactive output measurement of the unit.

[0096] In one embodiment, the above-mentioned step S101, starting the first unit and adjusting it to a steady-state power generation state, and starting the second unit and adjusting it to a power generation phase adjustment state, specifically includes the following contents: starting the first unit and the second unit; adjusting the active output of the first unit to a preset active output rated value and the reactive output of the first unit to zero according to a preset step size; the preset active output rated value is a positive number; adjusting the active output of the second unit to zero according to a preset step size, and adjusting the reactive output of the second unit to a preset reactive output rated value; the preset reactive output rated value is a negative number.

[0097] Specifically, the terminal starts the first unit and adjusts it to a steady-state power generation state. This may involve adjusting the active output of the first unit to a preset active output rating of 300 MW and the reactive output of the first unit to 0 Mvar in a preset step size of 10 Mvar. The terminal starts the second unit and adjusts it to a power generation phase adjustment state. This may involve adjusting the active output of the second unit to 0 MW and the reactive output of the second unit to a preset reactive output rating of -100 Mvar in a preset step size of 10 Mvar.

[0098] In this embodiment, the first unit and the second unit are started up; the active output of the first unit is adjusted to a preset active output rated value, and the reactive output of the first unit is adjusted to zero according to a preset step size; at the same time, the active output of the second unit is adjusted to zero, and the reactive output of the second unit is adjusted to a preset reactive output rated value according to a preset step size, thereby realizing the start-up and load adjustment of the first unit and the second unit, and laying the foundation for the subsequent step of increasing the reactive output of the first unit to an intermediate value or a maximum value.

[0099] In one embodiment, the above-mentioned method for measuring the reactive output of the unit also includes: when the first unit is started and adjusted to the steady state of power generation, and when the second unit is started and adjusted to the power generation phase adjustment, if it is detected that the bus voltage does not exceed the lower limit of the bus voltage in the measurement boundary condition, then the adjustment of the reactive output and active output of the second unit is stopped to maintain the stable operation of the second unit; after monitoring the preset time of stable operation of the second unit, the reactive output of the first unit and the reactive output of the second unit are measured.

[0100] Specifically, during the process of starting the first unit and adjusting it to the steady state of power generation, and starting the second unit and adjusting it to the phase-adjusted power generation, if it is detected that the bus voltage is lower than or equal to the bus voltage lower limit of 228kV in the above-mentioned measurement boundary conditions, the reactive phase advance of the second unit is stopped and the operation is maintained in this state, that is, the adjustment of the reactive output and active output of the second unit is stopped; after the second unit has been running stably for a preset period of time (for example, 10 minutes), the active output, reactive output, terminal voltage, 220kV bus voltage value, 10kV plant power voltage, 400V plant power voltage, generator stator current, rotor excitation current, temperature rise of each part, unit swing data and other unit data of the first unit and the second unit are measured and stored.

[0101] In this embodiment, during the process of starting up the first unit and adjusting it to the steady state of power generation, and starting up the second unit and adjusting it to the power generation phase adjustment, the bus voltage is detected in real time to see whether it does not exceed the lower limit of the bus voltage in the measurement boundary conditions, thereby laying the foundation for subsequent detection of whether the bus voltage reaches the measurement boundary conditions, realizing the start-up and loading of the first and second units, and completing the recording of the unit data in the current state.

[0102] In one embodiment, in the above step S104, after detecting that the power data of the power system reaches the measurement boundary conditions, measuring the current reactive output of the first unit and the current reactive output of the second unit, it also includes: restoring the reactive output of the first unit and the reactive output of the second unit to the initial value; and adjusting the load of the first unit and the second unit according to the current reactive output of the first unit and the current reactive output of the second unit.

[0103] The initial value refers to the normal operating value of the unit before the above-mentioned reactive output measurement step of the unit is performed.

[0104] Specifically, after completing the measurement of the maximum reactive output capacity of the unit, the terminal restores the reactive output of the first unit and the reactive output of the second unit to their initial values. After restoring to the initial values, the terminal again measures and stores the unit data, including the active output, reactive output, terminal voltage, 220kV bus voltage, 10kV plant power voltage, 400V plant power voltage, generator stator current, rotor excitation current, temperature rise of various components, and unit swing data of the first and second units; a message indicating the completion of the unit reactive output measurement is generated and feedback is provided. In addition, the terminal can also generate a unit dispatch instruction based on the current reactive output of the first unit and the current reactive output of the second unit; the unit dispatch instruction is used to increase or decrease the load of the first unit and the second unit or to shut down the unit.

[0105] In this embodiment, by restoring the reactive output of the first and second units to their initial values, the unit operating parameters are restored, reducing the impact of the current unit reactive output measurement on peak load periods. Furthermore, the loads of the first and second units are adjusted based on their current reactive outputs, improving the dispatch of unit loads and thus enhancing the operational reliability of the power system.

[0106] In one embodiment, the measurement boundary conditions include the voltage boundary range of the system voltage in the power system, the voltage boundary range of the outlet voltage of the first unit, the voltage boundary range of the outlet voltage of the second unit, the voltage boundary range of the unit power supply system in the power system, the current boundary range of the generator stator current in the power system, the current boundary range of the generator rotor current in the power system, the operating status and temperature rise range of the generator cooling system in the power system, and the vibration range of the generator set shaft system in the power system.

[0107] In practical applications, the measurement boundary conditions can be set as:

[0108] 1. The 220kV bus voltage is maintained at 228kV~240kV;

[0109] 2. The unit outlet voltage is maintained at 95% to 105% of the rated voltage, i.e. 14.96kV to 16.5375kV;

[0110] 3. The 10kV busbar voltage for power supply to the plant is maintained at 9.5kV to 10.5kV;

[0111] 4. The 400V power supply voltage of the factory is maintained at 360~420V;

[0112] 5. The stator current shall not exceed the rated current, i.e. 12243.5A;

[0113] 6. The rotor current shall not exceed the rated current, i.e. 1600A;

[0114] 7. The cooling system of the generator is working normally and the temperature rise of each part is within the normal range;

[0115] 8. The vibration of the generator set shaft system is within the normal range.

[0116] It is understood that when all conditions in the measurement boundary conditions are met, the measurement boundary conditions are considered to be met. When any condition in the measurement boundary conditions is not met, the measurement boundary conditions are considered to be exceeded.

[0117] In one embodiment, as shown in FIG4 , another method for measuring reactive output of a generator set is provided. The method is described by taking the application of the method to a power system as an example, and includes the following steps:

[0118] In step S401, when it is confirmed that the bus voltage in the power system meets the preset voltage range, the first unit in the power system is started and adjusted to a steady-state power generation state, and the second unit in the power system is started and adjusted to a power generation phase modulation state.

[0119] Step S402, gradually increase the reactive output of the first unit; when it is detected that the power data of the power system exceeds the corresponding limit range in the preset measurement boundary conditions, stop increasing the reactive output of the first unit and start gradually increasing the reactive leading capacity of the second unit.

[0120] The power data includes system voltage; wherein, increasing the reactive phase leading capacity of the second unit is used to reduce the system voltage.

[0121] Step S403: When the reactive leading capacity of the second unit reaches the under-excitation limit condition, the reactive leading capacity of the second unit is maintained in stable operation, and the reactive lagging capacity of the first unit is gradually increased.

[0122] Step S404 , while maintaining the reactive leading capacity of the second unit in stable operation and gradually increasing the reactive lagging capacity of the first unit, detect whether the power data of the power system meets the measurement boundary conditions.

[0123] Step S405: If it is detected that the power data of the power system reaches the measurement boundary condition, then the increase of the reactive delayed phase capacity of the first unit is stopped to maintain the stable operation of the first unit.

[0124] Step S406 , after the first unit and the second unit have been stably operating for a preset period of time, the current reactive output of the first unit and the current reactive output of the second unit are measured.

[0125] Step S407: Restore the reactive output of the first unit and the reactive output of the second unit to their initial values.

[0126] Step S408: adjusting the loads of the first unit and the second unit according to the current reactive output of the first unit and the current reactive output of the second unit.

[0127] The above-mentioned reactive output measurement method of the unit can achieve the following beneficial effects: through the different conditions of the unit load during delayed phase operation and advanced phase operation, the maximum reactive output of the unit when the measurement boundary conditions are reached is measured, thereby improving the accuracy of the unit reactive output measurement.

[0128] In order to more clearly illustrate the reactive power output measurement method of the unit provided by the embodiment of the present disclosure, the reactive power output measurement method of the unit is specifically described below using a specific embodiment. Another reactive power output measurement method of the unit is provided, which can be applied to the power system and specifically includes the following contents:

[0129] Step 1: Check the bus voltage.

[0130] Step 2: Start the first and second units and apply load.

[0131] Step 3: Increase the reactive power output to the intermediate state.

[0132] Step 4: Increase the reactive power output to the maximum value.

[0133] Step 5: Restore the reactive output of the first unit and the second unit to the initial value.

[0134] In this embodiment, the maximum reactive output of the unit when the measurement boundary conditions are reached is measured by taking into account the different load conditions of the unit during delayed phase operation and advanced phase operation, thereby improving the accuracy of the reactive output measurement of the unit. This allows the energy storage power station to maintain safe and stable power transmission during peak power consumption periods based on the actual reactive output capacity of the unit.

[0135] It should be understood that, although the various steps in the flowcharts involved in the various embodiments described above are displayed in sequence according to the instructions of the arrows, these steps are not necessarily executed in sequence in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order restriction on the execution of these steps, and these steps can be executed in other orders. Moreover, at least a portion of the steps in the flowcharts involved in the various embodiments described above can include multiple steps or multiple stages, and these steps or stages are not necessarily executed and completed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a portion of steps or stages in other steps.

[0136] Based on the same inventive concept, embodiments of the present application also provide a unit reactive power measurement device for implementing the aforementioned unit reactive power measurement method. The solution provided by this device is similar to the solution described in the aforementioned method. Therefore, the specific limitations of one or more unit reactive power measurement device embodiments provided below can be found in the limitations of the unit reactive power measurement method described above and will not be further elaborated here.

[0137] In one embodiment, as shown in FIG5 , a reactive power output measurement device 500 is provided, comprising: a unit startup module 501 , a reactive power increase module 502 , a reactive power debugging module 503 and a reactive power measurement module 504 , wherein:

[0138] The unit startup module 501 is used to start the first unit in the power system and adjust it to a steady state of power generation, and start the second unit in the power system and adjust it to a phase-adjusted power generation state when confirming that the bus voltage in the power system meets the preset voltage range.

[0139] The reactive power increasing module 502 is used to gradually increase the reactive output of the first unit. When it is detected that the power data of the power system exceeds the corresponding limit range in the preset measurement boundary conditions, the reactive power increasing module 502 stops increasing the reactive output of the first unit and starts to gradually increase the reactive phase leading capacity of the second unit. The power data includes the system voltage. Increasing the reactive phase leading capacity of the second unit is used to reduce the system voltage.

[0140] The reactive power debugging module 503 is used to maintain the reactive power leading capacity of the second unit in stable operation and gradually increase the reactive power lagging capacity of the first unit when the reactive power leading capacity of the second unit reaches the underexcitation limit condition.

[0141] The reactive power measurement module 504 is configured to measure the current reactive power output of the first unit and the current reactive power output of the second unit when it is detected that the power data of the power system reaches a measurement boundary condition.

[0142] In one embodiment, the reactive power increasing module 502 is further used to gradually increase the reactive output of the first unit according to a preset step size when it is detected that the power data of the power system does not meet the measurement boundary conditions, until the reactive output of the first unit is increased to an intermediate value; wherein the intermediate value is determined based on the rated active power of the first unit.

[0143] In one embodiment, the unit reactive output measurement device 500 also includes a reactive growth module, which is used to detect the power data of the power system when the reactive output of the first unit increases to an intermediate value; if it is detected that the power data of the power system is still within the limit range corresponding to the measurement boundary condition, the reactive output of the first unit is gradually increased according to the preset step size until the reactive output of the first unit is increased to a maximum value; the maximum value is determined based on the maximum delay phase of the first unit.

[0144] In one embodiment, the reactive power measurement module 504 is also used to detect whether the power data of the power system reaches the measurement boundary condition while maintaining the stable operation of the reactive leading capacity of the second unit and gradually increasing the reactive lagging capacity of the first unit; if it is detected that the power data of the power system reaches the measurement boundary condition, then stop increasing the reactive lagging capacity of the first unit to maintain the stable operation of the first unit; after the first unit and the second unit have been stably operating for a preset period of time, measure the current reactive output of the first unit and the current reactive output of the second unit.

[0145] In one embodiment, the unit startup module 501 is also used to start the first unit and the second unit; adjust the active output of the first unit to a preset active output rated value according to a preset step size, and adjust the reactive output of the first unit to zero; the preset active output rated value is a positive number; adjust the active output of the second unit to zero according to a preset step size, and adjust the reactive output of the second unit to a preset reactive output rated value; the preset reactive output rated value is a negative number.

[0146] In one embodiment, the voltage detection module of the reactive output measurement device 500 of the unit is used to stop adjusting the reactive output and active output of the second unit to maintain stable operation of the second unit if it is detected that the bus voltage does not exceed the lower limit of the bus voltage in the measurement boundary condition during the process of starting up the first unit and adjusting it to the steady state of power generation, and starting up the second unit and adjusting it to the phase modulation of power generation, and after monitoring the stable operation of the second unit for a preset period of time, measure the reactive output of the first unit and the reactive output of the second unit.

[0147] In one embodiment, the reactive power recovery module of the unit reactive power measurement device 500 is used to restore the reactive power of the first unit and the reactive power of the second unit to the initial value; and adjust the load of the first unit and the second unit according to the current reactive power of the first unit and the current reactive power of the second unit.

[0148] In one embodiment, the measurement boundary conditions in the unit reactive output measurement device 500 include the boundary range of the system voltage in the power system, the voltage boundary range of the outlet voltage of the first unit, the voltage boundary range of the outlet voltage of the second unit, the voltage boundary range of the unit power system in the power system, the current boundary range of the stator current of the generator in the power system, the current boundary range of the rotor current of the generator in the power system, the operating status and temperature rise range of the generator cooling system in the power system, and the vibration range of the generator shaft system in the power system.

[0149] Each module in the reactive power output measurement device described above can be implemented in whole or in part through software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in hardware form, or can be stored in a memory in the computer device in software form, so that the processor can call and execute the corresponding operations of each module.

[0150] In one embodiment, a computer device is provided. The computer device may be a power system, and its internal structure diagram may be as shown in Figure 6. The computer device includes a processor, a memory, an input / output interface (I / O), and a communication interface. The processor, memory, and I / O interface are connected via a system bus, and the communication interface is connected to the system bus via the I / O interface. The processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program, and a database. The internal memory provides an environment for the operation of the operating system and computer program in the non-volatile storage medium. The database of the computer device is used to store unit data such as current reactive output. The I / O interface of the computer device is used to exchange information between the processor and external devices. The communication interface of the computer device is used to communicate with external terminals via a network connection. When the computer program is executed by the processor, a method for measuring unit reactive output is implemented.

[0151] Those skilled in the art will understand that the structure shown in FIG6 is merely a block diagram of a portion of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0152] In one embodiment, a computer device is further provided, including a memory and a processor. The memory stores a computer program, and the processor implements the steps in the above method embodiments when executing the computer program.

[0153] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0154] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0155] Those skilled in the art will appreciate that all or part of the processes in the above-mentioned embodiment methods can be implemented by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, database or other media used in the embodiments provided in this application may include at least one of non-volatile and volatile memory. Non-volatile memory may include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory may include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in the various embodiments provided herein may include at least one of a relational database and a non-relational database. Non-relational databases may include, but are not limited to, distributed databases based on blockchains. The processor involved in the various embodiments provided herein may be, but are not limited to, a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, and the like.

[0156] The technical features of the above embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0157] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A method for measuring reactive output of a unit, characterized in that: The method comprises: When confirming that the bus voltage in the power system meets the preset voltage range, the first unit in the power system is started and adjusted to a steady state of power generation, and the second unit in the power system is started and adjusted to a power generation phase adjustment; gradually increasing the reactive output of the first unit, and when it is detected that the power data of the power system exceeds the corresponding limit range in the preset measurement boundary condition, stopping increasing the reactive output of the first unit and starting to gradually increase the reactive phase leading capacity of the second unit; the power data includes the system voltage; wherein increasing the reactive phase leading capacity of the second unit is used to reduce the system voltage; When the reactive leading phase capacity of the second unit reaches the under-excitation limit condition, the reactive leading phase capacity of the second unit is kept in stable operation, and the reactive lagging phase capacity of the first unit is gradually increased; When it is detected that the power data of the power system reaches the measurement boundary condition, the current reactive output of the first unit and the current reactive output of the second unit are measured.

2. The method according to claim 1, characterized in that The step of gradually increasing the reactive output of the first unit comprises: When it is detected that the power data of the power system does not reach the measurement boundary condition, gradually increasing the reactive output of the first unit according to a preset step length until the reactive output of the first unit is increased to an intermediate value; The intermediate value is determined according to the rated active power of the first unit.

3. The method according to claim 2, characterized in that After increasing the reactive output of the first unit to an intermediate value, the method further includes: When the reactive output of the first generator set increases to an intermediate value, detecting power data of the power system; If it is detected that the power data of the power system is still within the limit range corresponding to the measurement boundary conditions, the reactive output of the first unit continues to be gradually increased according to the preset step size until the reactive output of the first unit is increased to a maximum value; the maximum value is determined based on the maximum delay of the first unit.

4. The method according to claim 1, characterized in that The measuring, when detecting that the power data of the power system reaches the measurement boundary condition, the current reactive output of the first unit and the current reactive output of the second unit comprises: In the process of maintaining the reactive leading phase capacity of the second unit in stable operation and gradually increasing the reactive lagging phase capacity of the first unit, detecting whether the power data of the power system reaches the measurement boundary condition; If it is detected that the power data of the power system reaches the measurement boundary condition, stopping increasing the reactive delayed phase capacity of the first unit to maintain stable operation of the first unit; After the first unit and the second unit operate stably for a preset period of time, the current reactive output of the first unit and the current reactive output of the second unit are measured.

5. The method according to claim 1, characterized in that The step of starting the first unit and adjusting it to a steady-state power generation state, and starting the second unit and adjusting it to a power generation phase adjustment state, comprises: Start the first unit and the second unit; According to a preset step length, the active output of the first unit is adjusted to a preset active output rated value, and the reactive output of the first unit is adjusted to zero; the preset active output rated value is a positive number; According to the preset step size, the active output of the second unit is adjusted to zero, and the reactive output of the second unit is adjusted to a preset reactive output rated value; the preset reactive output rated value is a negative number.

6. The method according to claim 5, characterized in that The method further comprises: In the process of starting the first unit and adjusting it to a steady state of power generation, and starting the second unit and adjusting it to a power generation phase adjustment, if it is detected that the bus voltage does not exceed the lower limit of the bus voltage in the measurement boundary condition, then the reactive output and active output of the second unit are stopped to maintain stable operation of the second unit; After monitoring that the second unit operates stably for a preset period of time, the reactive output of the first unit and the reactive output of the second unit are measured.

7. The method according to claim 1, characterized in that In the case where it is detected that the power data of the power system reaches the measurement boundary condition, after measuring the current reactive output of the first unit and the current reactive output of the second unit, the method further includes: Restoring the reactive output of the first unit and the reactive output of the second unit to initial values; The loads of the first unit and the second unit are adjusted according to the current reactive output of the first unit and the current reactive output of the second unit.

8. The method according to any one of claims 1 to 7, characterized in that: The measurement boundary conditions include the boundary range of the system voltage in the power system, the voltage boundary range of the outlet voltage of the first unit, the voltage boundary range of the outlet voltage of the second unit, the voltage boundary range of the unit power supply system in the power system, the current boundary range of the stator current of the generator in the power system, the current boundary range of the rotor current of the generator in the power system, the operating status and temperature rise range of the cooling system of the generator in the power system, and the vibration range of the shaft system of the generator set in the power system.

9. A reactive power output measuring device for a unit, characterized in that: The device comprises: A unit startup module is used to start the first unit in the power system and adjust it to a steady state of power generation, and start the second unit in the power system and adjust it to a power generation phase adjustment state when confirming that the bus voltage in the power system meets a preset voltage range; a reactive power increasing module, configured to gradually increase the reactive power output of the first unit, and when detecting that the power data of the power system exceeds the corresponding limit range in the preset measurement boundary condition, stop increasing the reactive power output of the first unit, and start gradually increasing the reactive phase leading capacity of the second unit; the power data includes the system voltage; wherein increasing the reactive phase leading capacity of the second unit is used to reduce the system voltage; A reactive power debugging module, used for maintaining the reactive power leading capacity of the second unit in stable operation and gradually increasing the reactive power lagging capacity of the first unit when the reactive power leading capacity of the second unit reaches the under-excitation limit condition; The reactive power measurement module is used to measure the current reactive power output of the first unit and the current reactive power output of the second unit when it is detected that the power data of the power system reaches the measurement boundary condition.

10. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 8 are implemented.

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