Method and system for adjusting parameters of speed regulator of emergency diesel generator of high-temperature gas cooled reactor

Abstract

The invention relates to the technical field of emergency power systems, and discloses a high-temperature gas cooled reactor emergency diesel generator governor parameter adjusting method and system. The grid state information is used for indicating whether the operation condition of the power system in the grid is stable; and according to different power grid state information, on the basis of a Droop control principle, diesel generator speed regulator parameters in different power grid states are respectively set by utilizing power grid frequency information. By monitoring the frequency of the power grid in real time and dynamically adjusting the parameters of the speed regulator, accurate matching between the generator and the power demand of the power grid at the moment of grid connection is ensured, power impact is reduced, the reverse power phenomenon caused by frequency fluctuation is also avoided, and thus the stability of the whole power system is improved.

Description

Technical Field

[0001] The invention relates to the technical field of emergency power systems, and in particular to a method and system for adjusting parameters of a high-temperature gas-cooled reactor emergency diesel generator governor. Background Art

[0002] During the operation of the high-temperature gas-cooled reactor, due to its particularity and strict safety requirements, the configured diesel generator set assumes the important responsibility of providing reliable and safe electricity after losing the normal power supply outside the plant, so as to ensure that the reactor can be safely shut down and prevent damage to other important equipment due to failure of the external power supply system. Therefore, the diesel generator set must have key characteristics such as high reliability, stability, low maintenance requirements and fast start-up. As the core equipment in the speed control system of the emergency diesel generator set, the parameter setting of the speed governor plays a vital role in its performance. The parameter setting of the speed governor must not only meet the technical requirements of the unit, but also ensure the stability, sensitivity and reliability of the speed regulation performance.

[0003] At present, during the synchronous grid connection process of high-temperature reactor emergency diesel generator sets, due to improper parameter setting, the active power surge is often too high, followed by reverse power problems. Summary of the invention

[0004] In view of this, the present invention provides a method and system for adjusting parameters of a high temperature gas-cooled reactor emergency diesel generator governor to solve the problem of how to avoid excessive active power impact and subsequent reverse power phenomenon.

[0005] In a first aspect, the present invention provides a method for adjusting parameters of a high temperature gas-cooled reactor emergency diesel generator governor, the method comprising: obtaining grid state information and grid frequency information; the grid state information is used to indicate whether the operation status of the power system in the grid is stable;

[0006] According to different grid status information, based on the Droop control principle, the grid frequency information is used to set the diesel generator speed regulator parameters under different grid states.

[0007] The embodiment of the present invention monitors the grid frequency in real time and dynamically adjusts the speed regulator parameters according to the actual grid operating conditions to ensure that the generator accurately matches the power demand of the grid at the moment of grid connection, reduce power shock, and avoid reverse power phenomenon caused by frequency fluctuations. The optimized speed regulator parameters in this embodiment make the generator more stable when connected to the grid, reduce the shock to the grid, and thus improve the stability of the entire power system.

[0008] In an optional implementation, the grid state information is a stable state or an unstable state; the grid frequency information is a stable value of the grid frequency or a floating range of the grid frequency, and the grid frequency information is used to calculate the diesel generator speed regulator parameters under different grid states based on the Droop control principle according to different grid state information, specifically including:

[0009] When the grid state information is in a stable state, the automatic load power of the unit in the governor parameters during synchronous grid connection is set according to the stable value of the grid frequency and using the Droop control principle; wherein synchronous grid connection represents the process of synchronous connection between the generator and the grid;

[0010] When the grid state information is in an unstable state, the adjustment coefficient in the speed regulator parameters during synchronous grid connection is set according to the floating range of the grid frequency and by using the Droop control principle.

[0011] In the embodiment of the present invention, when the power grid is in a stable state, the grid frequency is relatively stable. By setting the automatic load power of the speed regulator, it can be ensured that the generator can automatically bear a certain load when connected to the grid, thereby effectively avoiding power fluctuations caused by load mismatch when connected to the grid. When the power grid state is unstable, the grid frequency may fluctuate. At this time, by adjusting the adjustment coefficient, the output power of the generator can be adjusted accordingly with the frequency fluctuation. When the frequency changes, the generator can respond quickly to the change in frequency, avoiding the reverse power phenomenon caused by frequency fluctuations.

[0012] In an optional implementation, when the grid state information is in a stable state, the automatic load power of the unit in the speed regulator parameters during synchronous grid connection is set according to the stable value of the grid frequency and using the Droop control principle, specifically including:

[0013] Determine the preset speed of the generator according to the stable value of the grid frequency;

[0014] Obtaining a current generator speed setting curve and a first generator speed in a Droop control mode, wherein the abscissa corresponding to the generator speed setting curve represents the grid load power, and the ordinate represents the generator speed; the first generator speed represents the generator speed corresponding to the generator speed setting curve when the grid load power is zero;

[0015] Keeping the slope of the current generator speed setting curve unchanged, continuously adjusting the first generator speed according to the preset power until the second generator speed is reached, wherein on the generator speed setting curve corresponding to the second generator speed, the generator speed corresponding to the preset power is the preset speed;

[0016] The automatic load power of the unit in the governor parameters during synchronous grid connection is determined based on the rotation speed of the second generator.

[0017] The embodiment of the present invention determines the preset speed of the generator according to the stable value of the grid frequency, obtains the current generator speed setting curve and the first generator speed under the Droop control mode, keeps the slope of the current generator speed setting curve unchanged, and continuously adjusts the first generator speed according to the preset power until the second generator speed is reached, so as to adjust the generator speed and the automatic load power of the unit, which can effectively reduce the impact of active power at the initial moment of synchronous grid connection, avoid instability of the generator or diesel engine due to sudden heavy load, and enable the power grid system to operate smoothly at a new balance point.

[0018] In an optional implementation manner, determining the preset speed of the generator according to the stable value of the grid frequency specifically includes:

[0019] Get the number of pole pairs of the generator itself;

[0020] Substitute the stable value of the grid frequency and the pole pair number of the generator into the speed calculation formula to calculate and obtain the preset speed of the generator; the speed calculation formula is:

[0021]

[0022] Among them, n represents the preset speed, f represents the stable value of the grid frequency, and p is the number of pole pairs of the generator itself.

[0023] The embodiment of the present invention can synchronize the output power of the generator with the grid frequency by calculating the preset rotation speed of the generator, avoid the mismatch between the power output and the grid frequency, and provide a data basis for the calculation of the automatic load power in the speed regulator parameters.

[0024] In an optional implementation, when the grid state information is in an unstable state, the adjustment coefficient in the speed regulator parameters during synchronous grid connection is set according to the floating range of the grid frequency and using the Droop control principle, specifically including:

[0025] Obtaining a current generator speed setting curve under the Droop control mode; wherein the horizontal axis corresponding to the generator speed setting curve represents the grid load power, and the vertical axis represents the generator speed;

[0026] Determining a first adjustment coefficient of the generator speed setting curve, wherein the first adjustment coefficient represents a slope of the generator speed setting curve when the generator is connected to the grid simultaneously;

[0027] Acquire a target grid frequency value within a floating range of the grid frequency, wherein the target grid frequency value represents a frequency value when the grid frequency rises;

[0028] determining a target engine speed of the generator according to a target grid frequency value;

[0029] Determining a target grid load power corresponding to the generator speed setting curve according to the target engine speed;

[0030] When the target grid load power is a negative value, the first adjustment coefficient is continuously increased until the second adjustment coefficient is reached, wherein, on the generator speed setting curve corresponding to the second adjustment coefficient, the grid load power corresponding to the target engine speed is a preset standard grid load power;

[0031] The second adjustment coefficient is used to determine the adjustment coefficient in the speed regulator parameters during synchronous grid connection.

[0032] The embodiment of the present invention obtains the current generator speed setting curve under the Droop control mode, obtains the target grid frequency value in the floating range of the grid frequency, to determine the target engine speed of the generator, and then determines the target grid load power corresponding to the generator speed setting curve. Once it is determined that the target grid load power is a negative value, the first adjustment coefficient is continuously increased until the second adjustment coefficient is reached. By automatically adjusting the adjustment coefficient of the speed regulator, it is possible to effectively adapt to changes in grid frequency, avoid reverse power problems, and ensure smooth operation of the diesel generator set after synchronous grid connection.

[0033] In an optional embodiment, the method further includes:

[0034] When the target grid load power is a positive value, determining whether the target grid load power is higher than a preset standard grid load power;

[0035] If so, continue to reduce the first adjustment coefficient until it reaches a second adjustment coefficient, wherein, on the generator speed setting curve corresponding to the second adjustment coefficient, the grid load power corresponding to the target engine speed is a preset standard grid load power.

[0036] In the embodiment of the present invention, when the target grid load power is a positive value, if the target grid load power is higher than the preset standard grid load power, the power output is reduced by reducing the adjustment coefficient to ensure that the power output of the generator does not exceed the preset standard load power, thereby ensuring the stable operation of the grid.

[0037] In a second aspect, the present invention provides a high temperature gas-cooled reactor emergency diesel generator governor parameter adjustment system, the system comprising:

[0038] A data acquisition module is used to acquire power grid status information and power grid frequency information; the power grid status information is used to indicate whether the operation status of the power system in the power grid is stable;

[0039] The parameter control module is used to set the diesel generator speed regulator parameters under different grid states based on the Droop control principle and grid frequency information according to different grid state information.

[0040] In a third aspect, the present invention provides a computer device, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, and the processor executing the method for adjusting the speed governor parameters of a high-temperature gas-cooled reactor emergency diesel generator according to the first aspect or any corresponding embodiment thereof by executing the computer instructions.

[0041] In a fourth aspect, the present invention provides a computer-readable storage medium having computer instructions stored thereon, the computer instructions being used to enable a computer to execute the method for adjusting parameters of a high-temperature gas-cooled reactor emergency diesel generator speed governor according to the first aspect or any corresponding embodiment thereof.

[0042] In a fifth aspect, the present invention provides a computer program product, comprising computer instructions, the computer instructions being used to enable a computer to execute the method for adjusting parameters of a high temperature gas-cooled reactor emergency diesel generator speed governor according to the first aspect or any corresponding embodiment thereof. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0044] Figure 1 It is a flow chart of a method for adjusting parameters of a high temperature gas-cooled reactor emergency diesel generator speed governor according to an embodiment of the present invention;

[0045] Figure 2 is a flow chart of another method for adjusting parameters of a high temperature gas-cooled reactor emergency diesel generator governor according to an embodiment of the present invention;

[0046] Figure 3 is a load-speed curve coordinate diagram of a method for adjusting parameters of a high-temperature gas-cooled reactor emergency diesel generator speed regulator according to an embodiment of the present invention;

[0047] Figure 4is a load-speed curve coordinate diagram of another method for adjusting parameters of a high-temperature gas-cooled reactor emergency diesel generator governor according to an embodiment of the present invention;

[0048] Figure 5 is a load-speed curve coordinate diagram of another method for adjusting parameters of a high-temperature gas-cooled reactor emergency diesel generator governor according to an embodiment of the present invention;

[0049] Figure 6 is a structural block diagram of a high temperature gas-cooled reactor emergency diesel generator governor parameter adjustment system according to an embodiment of the present invention;

[0050] Figure 7 It is a schematic diagram of the hardware structure of a computer device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0052] In the application of high temperature gas-cooled reactor (HTGR) emergency diesel generator sets, improper parameter setting of the governor may lead to excessive active power surge, followed by reverse power problems.

[0053] Specifically, during the synchronous grid connection process, the generator needs to be synchronized with the grid, including frequency, phase and voltage matching. If the speed regulator parameters are not set properly, the output power of the generator may not match the demand of the grid. When the generator set is suddenly connected to the grid, there may be a sharp increase in active power. This is because the generator is already in a high speed or output power state before synchronizing with the grid, resulting in excess power at the moment of grid connection, forming a power shock. In addition, the generator may output too low power when connected to the grid, resulting in reverse power, which not only wastes energy, but also triggers the protection system of the generator to operate, eventually causing tripping.

[0054] A method for adjusting the parameters of a high-temperature gas-cooled reactor emergency diesel generator governor provided in an embodiment of the present invention is applied to the use scenario of a high-temperature gas-cooled reactor emergency diesel generator set. The generator set will be used in important facilities such as nuclear power plants as an emergency backup power supply to cope with emergencies such as failure of the main power supply. The present invention monitors the grid frequency in real time and dynamically adjusts the governor parameters to ensure that the generator accurately matches the power demand of the grid at the moment of grid connection, reduces power shocks, and avoids reverse power phenomena caused by frequency fluctuations, thereby improving the stability of the entire power system.

[0055] According to an embodiment of the present invention, an embodiment of a method for adjusting parameters of a high-temperature gas-cooled reactor emergency diesel generator governor is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0056] In this embodiment, a method for adjusting parameters of a high temperature gas-cooled reactor emergency diesel generator governor is provided, which can be used in the above-mentioned computer. Figure 1 is a flow chart of a method for adjusting parameters of a high temperature gas-cooled reactor emergency diesel generator speed regulator according to an embodiment of the present invention. Figure 1 As shown, the process includes the following steps:

[0057] Step S101, obtaining grid state information and grid frequency information; the grid state information is used to indicate whether the operation status of the power system in the grid is stable.

[0058] Step S102, according to different grid state information, based on the Droop control principle, and using grid frequency information, respectively set diesel generator speed regulator parameters under different grid states.

[0059] It should be noted that the grid status information refers to identification information that can directly determine the current operating status of the grid, such as the grid voltage stability state, load stability state and the corresponding unstable state; the grid frequency information refers to the frequency of electric energy in the power system, such as 50Hz or 60Hz. Droop control is a speed control method for generator sets, specifically used for load distribution between generators running in parallel. The principle is that by introducing a negative feedback, namely Droop, between the frequency and the output power, the generator can adjust its output power according to the change of the grid frequency.

[0060] It is understandable that when the load increases and the grid frequency decreases, the droop control will reduce the output power of the generator, and vice versa, it will increase the output power of the generator. The governor parameters refer to the control parameters in the generator governor, such as the droop coefficient, the differential coefficient, etc., where the differential coefficient is related to the response amplitude of the generator to the frequency change.

[0061] Specifically, the operation status and frequency changes of the power grid are monitored in real time, and appropriate speed regulator parameters are set according to different power grid status information and frequency information to cope with the current working conditions of the power grid. For example, if the power grid frequency is stable, a higher synchronous grid-connected power can be set; if the frequency is unstable, the regulation coefficient of the Droop control is adjusted to avoid reverse power when connecting to the grid.

[0062] The embodiment of the present invention monitors the grid frequency in real time and dynamically adjusts the speed regulator parameters according to the actual grid operating conditions to ensure that the generator accurately matches the power demand of the grid at the moment of grid connection, reduce power shock, and avoid reverse power phenomenon caused by frequency fluctuations. The optimized speed regulator parameters in this embodiment make the generator more stable when connected to the grid, reduce the shock to the grid, and thus improve the stability of the entire power system.

[0063] In this embodiment, a method for adjusting parameters of a high temperature gas-cooled reactor emergency diesel generator governor is provided, which can be used in the above-mentioned computer. Figure 2 is a flow chart of a method for adjusting parameters of a high temperature gas-cooled reactor emergency diesel generator speed regulator according to an embodiment of the present invention. Figure 2 As shown, the process includes the following steps:

[0064] Step S201, obtaining grid status information and grid frequency information; the grid status information is used to indicate whether the operation status of the power system in the grid is stable. Figure 1 Step S101 of the illustrated embodiment will not be described in detail here.

[0065] Step S202, according to different grid state information, based on the Droop control principle, and using grid frequency information, respectively set diesel generator speed regulator parameters under different grid states.

[0066] In practical applications, the diesel generator speed control system has two working modes: island operation and synchronous operation. The embodiment of the present invention takes the synchronous operation working mode as an example for explanation. In the synchronous operation mode, the synchronous grid-connected function of the diesel generator set and the power grid can be realized. The relationship between the speed and load of the diesel engine is expressed as a negative slope Droop linear curve, that is, when the load increases, the speed of the unit will decrease, and conversely, when the load decreases, the speed of the unit will increase. The grid frequency is expressed as a constant straight line. The intersection of these two curves is the balance point of the diesel generator when it is synchronously connected to the grid. That is to say, when the actual speed of the generator set runs at the intersection of the DROOP curve and the grid frequency straight line, it means that the generator set has reached a balanced state synchronized with the grid frequency. At this time, the speed regulator sets the deviation to zero through the setting of the differential coefficient and the automatic load power, thereby realizing stable grid-connected operation.

[0067] Specifically, the grid state information is a stable state or an unstable state, and the grid frequency information is a stable value of the grid frequency or a floating range of the grid frequency. Step S202 includes:

[0068] Step S2021, when the grid state information is in a stable state, according to the stable value of the grid frequency and using the Droop control principle, the automatic load power of the unit in the governor parameters during synchronous grid connection is set; wherein synchronous grid connection represents the process of synchronous connection of the generator to the grid.

[0069] It should be noted that the automatic load power of the unit is an adjustable parameter in the generator speed governor, which is used to characterize the ability of the generator to automatically adjust the generator output power when it is synchronously connected to the power grid. In actual application, after the generator is successfully synchronized with the power grid, the speed governor is used to control the generator to automatically bear a certain load.

[0070] In a specific embodiment, step S2021 specifically includes:

[0071] A1, determines the preset speed of the generator according to the stable value of the grid frequency.

[0072] A2, obtain the current generator speed setting curve and the first generator speed under the Droop control mode, wherein the horizontal axis corresponding to the generator speed setting curve represents the grid load power, and the vertical axis represents the generator speed; the first generator speed represents the generator speed corresponding to the generator speed setting curve when the grid load power is zero.

[0073] A3, keep the slope of the current generator speed setting curve unchanged, and continuously adjust the first generator speed according to the preset power until the second generator speed is reached, wherein, on the generator speed setting curve corresponding to the second generator speed, the generator speed corresponding to the preset power is the preset speed.

[0074] A4, determining the automatic load power of the unit in the governor parameters when synchronously connected to the grid based on the rotation speed of the second generator.

[0075] For example, see Figure 3, determine the preset speed of the generator according to the stable value of the grid frequency. For example, when the generator is running in the Droop control mode, the speed corresponding to the initial grid-connected value initially set is 1000rmp. Obtain the generator speed setting curve and the first generator speed under the current Droop control mode. The horizontal axis of the speed setting curve represents the grid load power, and the vertical axis represents the generator speed. When the grid load power is zero, the speed corresponding to the intersection of the curve and the vertical axis is the first generator speed (the speed setting point at the initial grid-connected moment). The set grid-connected initial value is 10%, and the corresponding balance point is point A. Under the premise of keeping the slope of the current generator speed setting curve unchanged, gradually adjust the first generator speed. The goal is to make the generator speed reach the second generator speed. The second generator speed is determined according to the preset power, and the generator speed on the corresponding speed setting curve is the preset synchronous grid-connected speed. In this process, the balance point moves from point A to the left to point C, and the corresponding active power at the initial grid-connected moment is reduced to value E. Based on the speed of the second generator, the automatic load power of the unit in the governor parameters during the synchronous grid connection is determined, that is, the initial load power calculated corresponding to the speed of the second generator is 3%. The initial load power is optimized to 3% through adjustment, which reduces the initial value of the synchronous grid connection, and the balance point moves from point A to point C, which ultimately reduces the active power impact at the initial moment of grid connection, ensuring that the diesel engine can stably operate at the new balance point.

[0076] The embodiment of the present invention determines the preset speed of the generator according to the stable value of the grid frequency, obtains the current generator speed setting curve and the first generator speed under the Droop control mode, keeps the slope of the current generator speed setting curve unchanged, and continuously adjusts the first generator speed according to the preset power until the second generator speed is reached, so as to adjust the generator speed and the automatic load power of the unit, which can effectively reduce the impact of active power at the initial moment of synchronous grid connection, avoid instability of the generator or diesel engine due to sudden heavy load, and enable the power grid system to operate smoothly at a new balance point.

[0077] In an optional embodiment, determining the preset speed of the generator according to the stable value of the grid frequency specifically includes:

[0078] Get the number of pole pairs of the generator itself;

[0079] Substitute the stable value of the grid frequency and the pole pair number of the generator into the speed calculation formula to calculate and obtain the preset speed of the generator; the speed calculation formula is:

[0080]

[0081] Among them, n represents the preset speed, f represents the stable value of the grid frequency, and p is the number of pole pairs of the generator itself.

[0082] It should be noted that the number of pole pairs of a generator refers to half of the number of magnetic poles generated by the stator winding of the generator. Each pole pair of the generator rotor produces a complete magnetic field cycle, so the more pole pairs there are, the more electric energy waveform cycles the generator generates per rotation.

[0083] For example, the pole pair number of an emergency diesel generator is 3, and the grid frequency in the area is 50Hz. The speed calculation formula is used to calculate the preset speed of the generator to be 1000rpm. When the grid frequency is 50Hz, the generator needs to run at 1000rpm to synchronize with the grid frequency.

[0084] The embodiment of the present invention can synchronize the output power of the generator with the grid frequency by calculating the preset rotation speed of the generator, avoid the mismatch between the power output and the grid frequency, and provide a data basis for the calculation of the automatic load power in the speed regulator parameters.

[0085] Step S2022: When the grid state information is in an unstable state, the adjustment coefficient in the speed regulator parameters during synchronization and grid connection is set according to the floating range of the grid frequency and using the Droop control principle.

[0086] It should be noted that the regulation coefficient is also an adjustable parameter in the generator speed governor, which is used to characterize the relationship between the generator output power and frequency.

[0087] It is understandable that the regulation coefficient is set based on the Droop control principle. In the power system, Droop control balances the output power of the generator set by adjusting the regulation coefficient of the speed governor to avoid excessive frequency fluctuations. When the power grid is unstable, the grid frequency will fluctuate. The speed governor adjusts the output power of the generator according to the floating range of the grid frequency by setting the regulation coefficient. The larger the regulation coefficient, the more significant the power change of the generator when the frequency changes. Conversely, the smaller the regulation coefficient, the less significant the power change of the generator when the frequency changes.

[0088] In an optional embodiment, step S2022 specifically includes:

[0089] B1, obtaining the current generator speed setting curve under the Droop control mode; wherein the horizontal axis corresponding to the generator speed setting curve represents the grid load power, and the vertical axis represents the generator speed.

[0090] B2, determining a first adjustment coefficient of the generator speed setting curve, wherein the first adjustment coefficient represents a slope of the generator speed setting curve when the generator is connected to the grid synchronously.

[0091] B3, obtaining a target grid frequency value within a floating range of the grid frequency, wherein the target grid frequency value represents a frequency value when the grid frequency rises.

[0092] B4, determining a target engine speed of the generator according to the target grid frequency value.

[0093] B5, determining a target grid load power corresponding to the generator speed setting curve according to the target engine speed.

[0094] B6, when the target grid load power is a negative value, the first adjustment coefficient is continuously increased until the second adjustment coefficient is reached, wherein, on the generator speed setting curve corresponding to the second adjustment coefficient, the grid load power corresponding to the target engine speed is the preset standard grid load power.

[0095] B7, determining the second adjustment coefficient as the adjustment coefficient in the speed regulator parameters during synchronization and grid connection.

[0096] It is understandable that the speed governor adjustment coefficient K of the diesel generator set c It is a key parameter that determines the relationship between the generator output power and the grid frequency, and the calculation method of the regulation coefficient is expressed by the following formula:

[0097]

[0098] Among them, Δf is the unit frequency change rate, and ΔP is the unit power change rate. When the grid frequency changes, the diesel generator set is in synchronous grid-connected mode. At this time, the adjustment coefficient is optimized and adjusted according to the Droop control principle to adapt to the change of grid frequency and avoid reverse power problems.

[0099] Specifically, the speed setting curve of the current diesel generator in the Droop control mode is obtained, and the first adjustment coefficient of the speed setting curve is determined. The first adjustment coefficient represents the slope of the speed setting curve when the synchronous grid is connected, and the target grid frequency value within the floating range of the grid frequency is obtained. For example, when the grid frequency rises to 50.1Hz, the frequency value can be set as the target grid frequency, and the target speed of the generator is determined according to the target grid frequency value (for example, 50.1Hz) (the corresponding speed value is 1002rpm). Using the determined target engine speed, the corresponding target grid load power is found on the speed setting curve. If the target grid load power is a negative value at this time, the first adjustment coefficient is continuously increased until the second adjustment coefficient is reached. At this time, on the speed setting curve corresponding to the second adjustment coefficient, the grid load power corresponding to the target engine speed (1002rpm) is the preset standard grid load power. The adjusted second adjustment coefficient is used as the adjustment coefficient in the governor parameters when the synchronous grid is connected to ensure that the balance point of the generator set moves from the negative half axis to the positive half axis when the grid frequency increases, avoiding the reverse power problem.

[0100] For example, refer to Figure 4 When the grid frequency rises from 50Hz to 50.1Hz, since the Droop control curve of the generator set remains unchanged, the operating point of the diesel generator will move from the original equilibrium point (assumed to be point A) to the new intersection point C. At this time, the diesel engine speed rises to 1002rmp and the output power will drop to the E value.

[0101] For example, refer to Figure 5 If the speed regulator's differential coefficient is set too small, the Droop curve will be relatively flat. At this time, the new balance point may move to point B of the negative power axis, that is, the active power output by the generator becomes negative (i.e., reverse power). In order to avoid this situation, it is necessary to adjust the differential coefficient. Through steps B1 to B7, when it is detected that the output power of the generator drops to a negative value when the grid frequency rises, the system will automatically increase the differential coefficient and correct the differential coefficient to K. c2 (First adjustment coefficient) greater than or equal to K c1 (Second adjustment coefficient) makes the Droop curve steeper and the equilibrium point moves to a new position D, at which the output power of the generator is a positive value E, located on the positive half axis of power, effectively avoiding the reverse power problem.

[0102] The embodiment of the present invention obtains the current generator speed setting curve under the Droop control mode, obtains the target grid frequency value in the floating range of the grid frequency, to determine the target engine speed of the generator, and then determines the target grid load power corresponding to the generator speed setting curve. Once it is determined that the target grid load power is a negative value, the first adjustment coefficient is continuously increased until the second adjustment coefficient is reached. By automatically adjusting the adjustment coefficient of the speed regulator, it is possible to effectively adapt to changes in grid frequency, avoid reverse power problems, and ensure smooth operation of the diesel generator set after synchronous grid connection.

[0103] In another specific embodiment, step B6 and step B7 may also be replaced by the following steps:

[0104] C1, when the target grid load power is a positive value, it is determined whether the target grid load power is higher than a preset standard grid load power.

[0105] C2: If yes, continue to reduce the first adjustment coefficient until it reaches a second adjustment coefficient, wherein, on the generator speed setting curve corresponding to the second adjustment coefficient, the grid load power corresponding to the target engine speed is a preset standard grid load power.

[0106] It is worth noting that when the target grid load power is a positive value, the power output by the generator may be greater than or equal to the grid demand, exceeding the preset standard grid load power, causing the generator to output excessive power and affecting the stability of the system. Therefore, it is necessary to reduce the adjustment coefficient to reduce the output power of the generator to meet the preset standard.

[0107] Specifically, in order to solve the problem of excessive power, it is necessary to continuously reduce the first adjustment coefficient until the second adjustment coefficient is reached. During this adjustment process, the reduction of the adjustment coefficient will make the Droop curve flatter, thereby reducing the output power of the generator, so that at the target speed, the power output of the generator is equal to the preset standard grid load power.

[0108] In the embodiment of the present invention, when the target grid load power is a positive value, if the target grid load power is higher than the preset standard grid load power, the power output is reduced by reducing the adjustment coefficient to ensure that the power output of the generator does not exceed the preset standard load power, thereby ensuring the stable operation of the grid.

[0109] It is understandable that steps C1 and C2 are mainly to prevent excessive power output, while steps B6 and B7 are to prevent excessive power output or reverse power. The present invention also implements an embodiment in which, in two different situations, the output power of the generator is stabilized at an appropriate value when the grid frequency changes by adjusting the adjustment coefficient for different power deviations.

[0110] In the embodiment of the present invention, when the power grid is in a stable state, the grid frequency is relatively stable. By setting the automatic load power of the speed regulator, it can be ensured that the generator can automatically bear a certain load when connected to the grid, thereby effectively avoiding power fluctuations caused by load mismatch when connected to the grid. When the power grid state is unstable, the grid frequency may fluctuate. At this time, by adjusting the adjustment coefficient, the output power of the generator can be adjusted accordingly with the frequency fluctuation. When the frequency changes, the generator can respond quickly to the change in frequency, avoiding the reverse power phenomenon caused by frequency fluctuations.

[0111] In actual application, after executing a high-temperature gas-cooled reactor emergency diesel generator governor parameter adjustment method provided by the present invention, the no-load speed and full-power set speed of the unit were tested and verified by setting and adjusting key parameters in the verification stage.

[0112] Specifically, the steps for testing and verifying the no-load speed and full-power setting speed of the unit include:

[0113] The first step is to set the experimental environment to 24-hour synchronization and load test (i.e. 100% load for 22 hours and 110% load for 2 hours). The initial setting of the no-load speed is 1022rpm. The initial test shows that when the unit is at full power, the speed is 999.804rpm, and the manual speed increase or decrease setting of the speed regulator is 5rpm / s.

[0114] The second step is to calculate the adjustment coefficient according to the following formula:

[0115]

[0116] Among them, DROOP is the adjustment coefficient; N set Set the speed for the unit without load; N e Set the speed for the unit at full load. Substitute the above set value into the formula and calculate the adjustment coefficient (first adjustment coefficient) at this time:

[0117]

[0118] Step 3: Under the same adjustment coefficient DROOP, when different no-load speed limits N are set set When the full load speed is set to N e Different, a certain speed N0, according to the following formula to calculate the active power output at a specific speed:

[0119]

[0120] Among them, P0 represents the active power output at a specific speed; P e Indicates the full power of the diesel engine (i.e. 1450kW); Nset Indicates no-load set speed (i.e. 1022rmp); N e Indicates the full power set speed of the unit (i.e. 999.804rmp); N0 specific speed (speed after grid connection). Specifically, in the grid frequency recording, identify the lowest and highest frequency values, which are the upper and lower limits of the change. The corresponding grid frequency change range is 49.975Hz~50.051Hz. According to the calculation formula of P0, the corresponding unit output full power change is 1455.6~1561kW, which means that preliminary tests show that within the grid frequency change range (49.975Hz~50.051Hz), the full power output of the unit varies from 1455.6kW to 1561kW, with a fluctuation range of 105.9kW, which is too large and unstable.

[0121] In the fourth step, according to a method for adjusting the speed regulator parameters of a high temperature gas-cooled reactor emergency diesel generator provided by an embodiment of the present invention, when the target grid load power is a negative value, the first adjustment coefficient (2.22%) is continuously increased until the second adjustment coefficient is reached. Specifically, the no-load speed of the unit is set to N set =1060rmp, full power setting speed N e =1000.31rmp, according to the following formula, the second adjustment coefficient is calculated to be 6%, which is the final adjustment target:

[0122]

[0123] At the same time, the unit no-load speed and the unit full-power set speed are re-submitted into the calculation formula of P0, and the load power variation range is obtained to be 1560.9~1521.7kW, and the load fluctuation is reduced to 39.2kW. Compared with the previous 105.9kW, the fluctuation range is significantly smaller.

[0124] Through the four steps of testing and verifying the no-load speed and full-power set speed of the above-mentioned unit, it can be seen that after adjustment and optimization by the present invention, the influence of active power on power grid fluctuations can be significantly reduced. In more than 40 grid-connected tests after this optimization, no reverse power problem occurred, which verifies that the method of the present invention can also effectively avoid reverse power conditions at the time of grid connection.

[0125] In this embodiment, a high temperature gas-cooled reactor emergency diesel generator governor parameter adjustment system is also provided, which is used to implement the above-mentioned embodiments and preferred implementation modes, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware of a predetermined function. Although the system described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0126] This embodiment provides a high temperature gas-cooled reactor emergency diesel generator governor parameter adjustment system, such as Figure 6 As shown, including:

[0127] The data acquisition module 601 is used to acquire power grid status information and power grid frequency information; the power grid status information is used to indicate whether the operation status of the power system in the power grid is stable;

[0128] The parameter control module 602 is used to set the diesel generator speed regulator parameters under different grid states based on the Droop control principle and grid frequency information according to different grid state information.

[0129] In some optional implementations, the grid state information is a stable state or an unstable state; the grid frequency information is a stable value of the grid frequency or a floating range of the grid frequency, and the parameter control module 602 specifically includes:

[0130] A stable state parameter setting unit, used for setting the automatic load power of the unit in the governor parameter during synchronous grid connection according to the stable value of the grid frequency and using the Droop control principle when the grid state information is in a stable state; wherein synchronous grid connection represents the process of synchronous connection of the generator with the grid;

[0131] The non-stable state parameter setting unit is used to set the adjustment coefficient in the speed regulator parameters during synchronous grid connection according to the floating range of the grid frequency and using the Droop control principle when the grid state information is in a non-stable state.

[0132] In some optional implementations, the stable state parameter setting unit includes:

[0133] A generator preset speed determination subunit, used to determine the preset speed of the generator according to the stable value of the grid frequency;

[0134] The speed setting curve acquisition subunit is used to acquire the current generator speed setting curve and the first generator speed in the Droop control mode, wherein the abscissa corresponding to the generator speed setting curve represents the grid load power, and the ordinate represents the generator speed; the first generator speed represents the generator speed corresponding to the generator speed setting curve when the grid load power is zero;

[0135] a generator speed adjustment subunit, for maintaining the slope of the current generator speed setting curve unchanged, and continuously adjusting the first generator speed according to a preset power until a second generator speed is reached, wherein on the generator speed setting curve corresponding to the second generator speed, the generator speed corresponding to the preset power is the preset speed;

[0136] The automatic load power determination subunit is used to determine the automatic load power of the unit in the speed regulator parameters when the synchronization is connected to the grid based on the speed of the second generator.

[0137] In some optional implementations, the generator preset speed determination subunit is specifically used to: obtain the number of pole pairs of the generator itself; substitute the stable value of the grid frequency and the number of pole pairs of the generator itself into the speed calculation formula to calculate and obtain the preset speed of the generator; the speed calculation formula is:

[0138]

[0139] Among them, n represents the preset speed, f represents the stable value of the grid frequency, and p is the number of pole pairs of the generator itself.

[0140] In some optional implementations, the non-stable state parameter setting unit includes:

[0141] The speed setting curve acquisition subunit is used to acquire the current generator speed setting curve in the Droop control mode; wherein the horizontal axis corresponding to the generator speed setting curve represents the grid load power, and the vertical axis represents the generator speed;

[0142] A first adjustment coefficient determination subunit, used to determine a first adjustment coefficient of the generator speed setting curve, wherein the first adjustment coefficient represents the slope of the generator speed setting curve when the generator is connected to the grid simultaneously;

[0143] A target grid frequency value acquisition subunit is used to acquire a target grid frequency value within a floating range of the grid frequency, wherein the target grid frequency value represents a frequency value when the grid frequency rises;

[0144] a target generator speed determination subunit, for determining a target engine speed of the generator according to a target grid frequency value;

[0145] a target load power determination subunit, configured to determine a target grid load power corresponding to the generator speed setting curve according to the target engine speed;

[0146] A modulation coefficient adjustment subunit, configured to continuously increase the first modulation coefficient until a second modulation coefficient is reached when the target grid load power is a negative value, wherein, on the generator speed setting curve corresponding to the second modulation coefficient, the grid load power corresponding to the target engine speed is a preset standard grid load power;

[0147] The adjustment coefficient setting subunit is used to determine the adjustment coefficient in the speed regulator parameters during synchronous grid connection with the second adjustment coefficient.

[0148] In some optional implementations, the non-stable state parameter setting unit further includes:

[0149] A target load power judgment subunit is used to judge whether the target grid load power is higher than a preset standard grid load power when the target grid load power is a positive value;

[0150] The modulation coefficient reduction subunit is used to continuously reduce the first modulation coefficient until a second modulation coefficient is reached, wherein, on the generator speed setting curve corresponding to the second modulation coefficient, the grid load power corresponding to the target engine speed is a preset standard grid load power.

[0151] The further functional description of each of the above modules and units is the same as that of the above corresponding embodiments and will not be repeated here.

[0152] The high temperature gas-cooled reactor emergency diesel generator governor parameter adjustment system in this embodiment is presented in the form of a functional unit, where the unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that executes one or more software or fixed programs, and / or other devices that can provide the above functions.

[0153] The embodiment of the present invention also provides a computer device having the above Figure 6 The high temperature gas-cooled reactor emergency diesel generator governor parameter adjustment system is shown.

[0154] See also Figure 7 , Figure 7 is a schematic diagram of the structure of a computer device provided by an optional embodiment of the present invention, such as Figure 7 As shown, the computer device includes: one or more processors 10, a memory 20, and interfaces for connecting various components, including high-speed interfaces and low-speed interfaces. Various components are connected to each other using different buses for communication, and can be installed on a common mainboard or installed in other ways as needed. The processor can process the instructions executed in the computer device, including instructions stored in or on the memory to display the graphical information of the GUI on an external input / output device (such as, a display device coupled to the interface). In some optional embodiments, if necessary, multiple processors and / or multiple buses can be used together with multiple memories and multiple memories. Similarly, multiple computer devices can be connected, and each device provides some necessary operations (for example, as a server array, a group of blade servers, or a multi-processor system). Figure 7 A processor 10 is taken as an example.

[0155] The processor 10 may be a central processing unit, a network processor or a combination thereof. The processor 10 may further include a hardware chip. The hardware chip may be a dedicated integrated circuit, a programmable logic device or a combination thereof. The programmable logic device may be a complex programmable logic device, a field programmable gate array, a general purpose array logic or any combination thereof.

[0156] The memory 20 stores instructions executable by at least one processor 10, so that at least one processor 10 executes the method shown in the above embodiment.

[0157] The memory 20 may include a program storage area and a data storage area, wherein the program storage area may store an operating system, an application required for at least one function; the data storage area may store data created according to the use of the computer device, etc. In addition, the memory 20 may include a high-speed random access memory, and may also include a non-transient memory, such as at least one disk storage device, a flash memory device, or other non-transient solid-state storage device. In some optional embodiments, the memory 20 may optionally include a memory remotely arranged relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0158] The memory 20 may include a volatile memory, such as a random access memory; the memory may also include a non-volatile memory, such as a flash memory, a hard disk or a solid state drive; the memory 20 may also include a combination of the above types of memory.

[0159] The computer device further comprises a communication interface 30 for the computer device to communicate with other devices or a communication network.

[0160] The embodiment of the present invention also provides a computer-readable storage medium. The method according to the embodiment of the present invention can be implemented in hardware, firmware, or can be implemented as a computer code that can be recorded in a storage medium, or can be implemented as a computer code that is originally stored in a remote storage medium or a non-temporary machine-readable storage medium and will be stored in a local storage medium through a network download, so that the method described herein can be stored in such software processing on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. Among them, the storage medium can be a magnetic disk, an optical disk, a read-only storage memory, a random access memory, a flash memory, a hard disk or a solid-state hard disk, etc.; further, the storage medium can also include a combination of the above types of memories. It can be understood that a computer, a processor, a microprocessor controller, or programmable hardware includes a storage component that can store or receive software or computer code. When the software or computer code is accessed and executed by a computer, a processor, or hardware, the method shown in the above embodiment is implemented.

[0161] A part of the present invention may be applied as a computer program product, such as a computer program instruction, which, when executed by a computer, can call or provide the method and / or technical solution according to the present invention through the operation of the computer. Those skilled in the art should understand that the existence of the computer program instruction in a computer-readable medium includes, but is not limited to, a source file, an executable file, an installation package file, etc., and accordingly, the way in which the computer program instruction is executed by the computer includes, but is not limited to: the computer directly executes the instruction, or the computer compiles the instruction and then executes the corresponding compiled program, or the computer reads and executes the instruction, or the computer reads and installs the instruction and then executes the corresponding installed program. Here, the computer-readable medium may be any available computer-readable storage medium or communication medium accessible to the computer.

[0162] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the defined scope.

Claims

1. A method for adjusting the speed governor parameters of a high temperature gas-cooled reactor emergency diesel generator. It is characterized in that The method comprises: Acquiring grid status information and grid frequency information; the grid status information is used to indicate whether the operation status of the power system in the grid is stable; According to different grid status information, based on the Droop control principle, the grid frequency information is used to set the diesel generator speed regulator parameters under different grid states.

2. The method according to claim 1, It is characterized in that The grid state information is a stable state or an unstable state; the grid frequency information is a stable value of the grid frequency or a floating range of the grid frequency. The grid frequency information is used to calculate the diesel generator speed regulator parameters under different grid states based on the Droop control principle according to different grid state information, specifically including: When the grid state information is in a stable state, the automatic load power of the unit in the governor parameters during synchronous grid connection is set according to the stable value of the grid frequency and using the Droop control principle; wherein synchronous grid connection represents the process of synchronous connection between the generator and the grid; When the grid state information is in an unstable state, the adjustment coefficient in the speed regulator parameters during synchronous grid connection is set according to the floating range of the grid frequency and by using the Droop control principle.

3. The method according to claim 2, It is characterized in that When the grid state information is in a stable state, according to the stable value of the grid frequency and using the Droop control principle, the automatic load power of the unit in the speed regulator parameters during synchronous grid connection is set, specifically including: Determine the preset speed of the generator according to the stable value of the grid frequency; Obtaining a current generator speed setting curve and a first generator speed in a Droop control mode, wherein the abscissa corresponding to the generator speed setting curve represents the grid load power, and the ordinate represents the generator speed; the first generator speed represents the generator speed corresponding to the generator speed setting curve when the grid load power is zero; Keeping the slope of the current generator speed setting curve unchanged, continuously adjusting the first generator speed according to the preset power until the second generator speed is reached, wherein on the generator speed setting curve corresponding to the second generator speed, the generator speed corresponding to the preset power is the preset speed; The automatic load power of the unit in the governor parameters during synchronous grid connection is determined based on the rotation speed of the second generator.

4. The method according to claim 3, It is characterized in that Determining the preset speed of the generator according to the stable value of the grid frequency specifically includes: Get the number of pole pairs of the generator itself; Substitute the stable value of the grid frequency and the pole pair number of the generator into the speed calculation formula to calculate and obtain the preset speed of the generator; the speed calculation formula is: Among them, n represents the preset speed, f represents the stable value of the grid frequency, and p is the number of pole pairs of the generator itself.

5. The method according to claim 2, It is characterized in that When the grid state information is in an unstable state, according to the floating range of the grid frequency and using the Droop control principle, the adjustment coefficient in the speed regulator parameters during synchronous grid connection is set, specifically including: Obtaining a current generator speed setting curve under the Droop control mode; wherein the horizontal axis corresponding to the generator speed setting curve represents the grid load power, and the vertical axis represents the generator speed; Determining a first adjustment coefficient of the generator speed setting curve, wherein the first adjustment coefficient represents a slope of the generator speed setting curve when the generator is connected to the grid simultaneously; Acquire a target grid frequency value within a floating range of the grid frequency, wherein the target grid frequency value represents a frequency value when the grid frequency rises; determining a target engine speed of the generator according to a target grid frequency value; Determining a target grid load power corresponding to the generator speed setting curve according to the target engine speed; When the target grid load power is a negative value, the first adjustment coefficient is continuously increased until the second adjustment coefficient is reached, wherein, on the generator speed setting curve corresponding to the second adjustment coefficient, the grid load power corresponding to the target engine speed is a preset standard grid load power; The second adjustment coefficient is used to determine the adjustment coefficient in the speed regulator parameters during synchronous grid connection.

6. The method according to claim 5, It is characterized in that The method further comprises: When the target grid load power is a positive value, determining whether the target grid load power is higher than a preset standard grid load power; If so, continue to reduce the first adjustment coefficient until it reaches a second adjustment coefficient, wherein, on the generator speed setting curve corresponding to the second adjustment coefficient, the grid load power corresponding to the target engine speed is a preset standard grid load power.

7. A high temperature gas-cooled reactor emergency diesel generator governor parameter adjustment system, It is characterized in that The system comprises: A data acquisition module is used to acquire power grid status information and power grid frequency information; the power grid status information is used to indicate whether the operation status of the power system in the power grid is stable; The parameter control module is used to set the diesel generator speed regulator parameters under different grid states based on the Droop control principle and grid frequency information according to different grid state information.

8. A computer device, It is characterized in that include: A memory and a processor, wherein the memory and the processor are communicatively connected to each other, the memory stores computer instructions, and the processor executes the method for adjusting the speed regulator parameters of a high-temperature gas-cooled reactor emergency diesel generator according to any one of claims 1 to 6 by executing the computer instructions.

9. A computer-readable storage medium, It is characterized in that The computer-readable storage medium stores computer instructions, and the computer instructions are used to enable a computer to execute the method for adjusting parameters of a high-temperature gas-cooled reactor emergency diesel generator governor according to any one of claims 1 to 6.

10. A computer program product, It is characterized in that It comprises computer instructions, and the computer instructions are used to enable a computer to execute the method for adjusting parameters of a high-temperature gas-cooled reactor emergency diesel generator governor according to any one of claims 1 to 6.

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