CN112260596A - Generator stator current overcurrent control method and related device - Google Patents
Generator stator current overcurrent control method and related device Download PDFInfo
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- CN112260596A CN112260596A CN202011180644.5A CN202011180644A CN112260596A CN 112260596 A CN112260596 A CN 112260596A CN 202011180644 A CN202011180644 A CN 202011180644A CN 112260596 A CN112260596 A CN 112260596A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/105—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for increasing the stability
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/107—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for limiting effects of overloads
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Abstract
The invention discloses a generator stator current overcurrent control method and a related device, wherein the method comprises the following steps: obtaining stator current in the running of a generator set; if the active component is smaller than the preset maximum value of the active component, performing constant voltage closed-loop control according to the initial overcurrent limiting value; if the active component is between the preset active component maximum value and the gain active component maximum value, constant voltage closed-loop control is carried out according to the gain overcurrent limiting value, the gain active component maximum value is the product of a first gain coefficient which is larger than 1 and the preset active component maximum value, and the gain overcurrent limiting value is the sum of the initial overcurrent limiting value and the preset gain quantity; if the active component is larger than the maximum value of the gain active component, setting the given value of the reactive component to zero, and switching the control mode to constant reactive power closed-loop control according to the gain overcurrent limiting value. The technical problems that in the prior art, active power and reactive power of stator current are not distinguished, the excitation adjusting range is limited, and the stability of an overcurrent limiting link is poor are solved.
Description
Technical Field
The invention relates to the technical field of power system control, in particular to a generator stator current overcurrent control method and a related device.
Background
The dynamic stability problem of the system exists under certain specific operation conditions and faults of the power grid. For example, power oscillation of the unit causes a power oscillation monitoring alarm, and it is proved by experiments that the direct cause of the fault is that the stator current overcurrent control of the excitation system has a problem, which causes the power oscillation of the unit.
The existing closed-loop control method for the stator current effective value of the generator does not distinguish the active component and the reactive component of the stator current of the generator, so that the generator set is inevitably oscillated once the generator processes power exceeding the rated power, and at the moment, the adjustable range of the excitation regulator is very small, so that the stability of overcurrent limitation is poor.
Disclosure of Invention
The invention provides a generator stator current overcurrent control method and a related device, which are used for solving the technical problems that the stability of an overcurrent limiting link is poor due to the fact that the stator current is not distinguished by active power and reactive power and the excitation adjusting range is limited in the prior art.
In view of the above, a first aspect of the present invention provides a generator stator current overcurrent control method, including:
obtaining a stator current effective value in the running of a generator set, wherein the stator current effective value comprises an active component and a reactive component;
if the active component is smaller than the preset maximum value of the active component, performing constant voltage closed-loop control according to the initial overcurrent limiting value;
if the active component is between the preset active component maximum value and the gain active component maximum value, performing constant voltage closed-loop control according to a gain overcurrent limiting value, wherein the gain active component maximum value is a product of a first gain coefficient which is greater than 1 and the preset active component maximum value, and the gain overcurrent limiting value is the sum of the initial overcurrent limiting value and a preset gain quantity;
and if the active component is larger than the maximum value of the gain active component, setting the given value of the reactive component to zero, and switching the control mode to constant reactive power closed-loop control according to the gain overcurrent limiting value.
Optionally, the effective value of the stator current is:
wherein idFor the active component, iqIs the reactive component.
Optionally, the calculation process of the gain overcurrent limiting value is as follows:
calculating the preset gain according to a gain formula, the active component and the preset maximum value of the active component, wherein the gain formula is as follows:
ΔI＝Kp×(id-id max)；
wherein Δ I is the preset gain amount, KpIs the second gain factor, idFor the active component, id maxThe preset maximum value of the active component is obtained;
and summing the initial overcurrent limiting value and the preset gain amount to obtain a gain overcurrent limiting value.
A second aspect of the present invention provides a generator stator current overcurrent control apparatus, including:
the acquisition module is used for acquiring a stator current effective value in the running of the generator set, wherein the stator current effective value comprises an active component and a reactive component;
the first judgment module is used for carrying out constant voltage closed-loop control according to the initial overcurrent limiting value if the active component is smaller than the preset maximum value of the active component;
the second judgment module is used for carrying out constant-voltage closed-loop control according to a gain overcurrent limiting value if the active component is between the preset active component maximum value and the gain active component maximum value, wherein the gain active component maximum value is the product of a first gain coefficient which is greater than 1 and the preset active component maximum value, and the gain overcurrent limiting value is the sum of the initial overcurrent limiting value and a preset gain quantity;
and the third judgment module is used for setting the given value of the reactive component to zero if the active component is larger than the maximum value of the gain active component, and switching the control mode to constant reactive power closed-loop control according to the gain overcurrent limiting value.
Optionally, the effective value of the stator current is:
wherein idFor the active component, iqIs the reactive component.
Optionally, the calculation process of the gain overcurrent limiting value is as follows:
calculating the preset gain according to a gain formula, the active component and the preset maximum value of the active component, wherein the gain formula is as follows:
ΔI＝Kp×(id-id max)；
wherein Δ I is the preset gain amount, KpIs the second gain factor, idFor the active component, id maxThe preset maximum value of the active component is obtained;
and summing the initial overcurrent limiting value and the preset gain amount to obtain a gain overcurrent limiting value.
A third aspect of the invention provides a generator stator current overcurrent control apparatus, the apparatus comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the generator stator current overcurrent control method according to the first aspect, according to instructions in the program code.
A fourth aspect of the present invention provides a computer-readable storage medium for storing program code for executing the generator stator current overcurrent control method of the first aspect.
A fifth aspect of the invention provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the generator stator current overcurrent control method of the first aspect.
According to the technical scheme, the invention has the following advantages:
the invention provides a generator stator current overcurrent control method, which comprises the following steps: obtaining a stator current effective value in the running of a generator set, wherein the stator current effective value comprises an active component and a reactive component; if the active component is smaller than the preset maximum value of the active component, performing constant voltage closed-loop control according to the initial overcurrent limiting value; if the active component is between the preset active component maximum value and the gain active component maximum value, constant voltage closed-loop control is carried out according to the gain overcurrent limiting value, the gain active component maximum value is the product of a first gain coefficient which is larger than 1 and the preset active component maximum value, and the gain overcurrent limiting value is the sum of the initial overcurrent limiting value and the preset gain quantity; if the active component is larger than the maximum value of the gain active component, setting the given value of the reactive component to zero, and switching the control mode to constant reactive power closed-loop control according to the gain overcurrent limiting value.
The generator stator current overcurrent control method distinguishes the active component and the reactive component of the stator current effective value, multiple judgment is carried out on the active component in a targeted manner, different overcurrent limiting values are adopted to carry out different closed-loop control under the condition that the active component is in different sizes, and the regulation limitation of the reactive component is reasonably utilized, so that different power change conditions in a system are responded, and the system is more stable and reliable. Therefore, the invention solves the technical problems that the prior art does not distinguish the active power from the reactive power of the stator current, and the excitation adjusting range is limited, so that the stability of the overcurrent limiting link is poor.
Drawings
Fig. 1 is a schematic flow chart of a generator stator current overcurrent control method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a generator stator current overcurrent control device according to an embodiment of the present invention;
fig. 3 is a unit power oscillation curve chart recorded by a power grid PMU according to an embodiment of the present invention
Fig. 4 is a monitoring wave recording diagram (water level, guide vane opening, active power) of the power plant unit provided by the embodiment of the invention;
FIG. 5 is a schematic diagram of a main control loop structure for limiting the stator current of the motor according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the motor stator current limit switching logic provided in accordance with an embodiment of the present invention;
FIG. 7 is a schematic diagram of a logic structure for automatically adjusting an overcurrent limiting value of a stator current of an engine according to an embodiment of the present invention;
FIG. 8 is a simulation test result of the old generator stator current limit control logic provided by an application example of the present invention;
fig. 9 is a simulation test result of the generator stator current limit control logic according to the embodiment of the present invention provided in the application example of the present invention.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Case analysis:
referring to fig. 3, taking a generator set of a secondary station of an indigenous bridge in the Guizhou as an example, when power oscillation occurs on a certain day, the oscillation frequency is 1.11Hz, the peak-to-peak value is 59MW, the oscillation duration is 3 minutes and 17 seconds, a power grid dispatcher immediately requests to quit a generator causing oscillation after a PMU power oscillation monitoring alarm is given, and the generator is disconnected after processing is quickly reduced to zero. Then, the fault unit makes a primary frequency modulation action, the power is locked for closed loop adjustment after the primary frequency modulation action, the main opening degree of the unit is fixed at 81.5%, the superposed value of the primary frequency modulation superposition amount gives the opening degree, the speed regulator operates in an opening degree mode, the water head of the surge shaft is 632 meters, please refer to fig. 4, the surge shaft is at the lowest water head at the time, the unit operates at 81.5% of the main opening degree, the unit output continuously increases along with the rise of the water head of the surge shaft, the unit active power increases to 241MW after a period of time, and the idle power increases from-50 MVar to-46 MVar under the regulation of an excitation device AVR. In the power oscillation process of the unit, the speed regulator is in an opening control mode, and the opening of the guide vane of the unit is basically kept unchanged, so that the power oscillation of the unit is not directly caused by the speed regulator. On-site investigation finds that the excitation regulator of the fault unit continuously sends out 'stator current overcurrent limiting action alarm' and returns, the alarm action frequency is consistent with the unit power oscillation frequency, and the direct reason that the fault is reproduced through testing is that the stator current overcurrent limiting of the excitation system has a defect, so that the power oscillation of the unit is caused. This is the discovery process of the technical problem of stator current overcurrent control.
Referring to fig. 5, a structure of a main control loop for controlling the overcurrent of the stator current of the generator is as shown in fig. 5, according to a design standard of the generator, the stator current of the generator needs to continuously operate for a long time under 1.1 times of the rated stator current, when a constant value current of the generator is greater than 1.1 times of the rated stator current, heat accumulation is generated, and the generator set allows the heat accumulation to meet a certain condition:
wherein, IaIs the actual value of the generator stator current, INFor the generator stator current rating, t is the run time. And after the current of the generator stator is subjected to overcurrent limiting action, the generator excitation system is switched to a generator stator current closed-loop control mode.
For easy understanding, referring to fig. 1, a first embodiment of a method for controlling an overcurrent of a stator current of a generator according to the present invention includes:
The effective stator current values are:
wherein idAs the active component, iqIs the reactive component.
Active component i of stator current effective valuedIs controlled by the speed regulating system of the generator set, and the reactive component iqIs controlled by the excitation system, so that the excitation system can only control the reactive component i of the generator stator currentqWhen the active power of the generator exceeds the rated active power to generate power, the active component of the effective value of the stator current of the generator already exceeds the limit value of the stator current, and no matter how the corresponding reactive component is adjusted by the excitation system, the effective value of the stator current of the generator cannot be adjusted to be below the limit value, so that unit oscillation is inevitably caused. The existing design scheme only considers the working condition that the output of the unit cannot exceed the rated power, but actually the output of the hydroelectric generating unit exceeds the rated power sometimes, moreover, when the active component of the generating unit is large, the adjustable range of the excitation regulator is very small, and the adjustment quality is reduced to a large extent. Therefore, different levels of analysis need to be performed on active components with large influences, and different control adjustment modes are provided, so that the stability of the system is ensured.
And 102, if the active component is smaller than the preset maximum value of the active component, performing constant voltage closed-loop control according to the initial overcurrent limiting value.
It should be noted that the preset maximum value of the active component is the maximum value of the active component of the stator current, and the active component idLess than a preset maximum value i of active componentd maxIn the process, the set initial overcurrent limiting value I is directly adopted without special adjustment or control operationsetConstant voltage closed-loop control is carried out, the stator current overcurrent limiter works normally, and the output of the stator current limiting loop is assumed to be IexoutPlease refer to fig. 6, QoutThe output is 0, and after the two outputs are compared, the smaller value output is taken as the stator current limit output. I isexoutReferring to fig. 7, the active component idLess than a preset maximum value i of active componentd maxWhen i isd-id maxThrough KpAfter the link is less than 0, the output limit of the amplitude limiting link in fig. 7 is 0, and the given value of the initial overcurrent limit value is superposed to be 0, so that the correct action of the initial overcurrent limit is not influenced.
And 103, if the active component is between the preset active component maximum value and the gain active component maximum value, performing constant-voltage closed-loop control according to a gain overcurrent limiting value, wherein the gain active component maximum value is the product of a first gain coefficient which is greater than 1 and the preset active component maximum value, and the gain overcurrent limiting value is the sum of an initial overcurrent limiting value and a preset gain quantity.
In addition, k is usediRepresenting the first gain factor, then gain active component maximum i'd maxMay be represented by i'd max＝ki×id maxThe active component is i between the preset maximum value of the active component and the maximum value of the gain active componentd max≤id≤i'd maxAt this time, Q in FIG. 6outThe output is 0, the gain overcurrent limit value at this time is not the initial overcurrent limit value but an updated overcurrent limit value obtained through calculation, at this time, the gain calculation improves the generator stator current overcurrent limit value and is not enough to switch the control mode, and the gain overcurrent limit value and I in FIG. 7setAnd I is still less than 0 after calculation, so the stator current limit output is IexoutThe constant voltage closed-loop control mode in the normal working process is still adopted, but the improvement of the limit value can ensure that the stator current overcurrent limit does not malfunction.
Further, the calculation process of the gain overcurrent limiting value is as follows:
calculating a preset gain according to a gain formula, the active component and a preset maximum value of the active component, wherein the gain formula is as follows:
ΔI＝Kp×(id-id max)；
wherein, Delta I is a preset gain amount, KpIs the second gain factor, idAs the active component, id maxThe maximum value of the preset active component is obtained; and summing the initial overcurrent limiting value and a preset gain amount to obtain a gain overcurrent limiting value. That is, the gain overcurrent limit value is I'set＝ΔI+Iset(ii) a Through reasonable setting KpCan ensure the final output IexoutIs 0, so that the control mode is not affected.
And step 104, if the active component is larger than the maximum value of the gain active component, setting the given value of the reactive component to zero, and switching the control mode to constant reactive power closed-loop control according to the gain overcurrent limiting value.
When i is required to be mentionedd＞i'd maxAt this time, please refer to FIG. 6, let the constant reactive power close loop QrefSwitching the control mode to constant reactive power closed-loop control when the control mode is 0, and setting the given value i of the reactive componentqControl to zero, thus obtaining
This result is obtained by the minimum reactive regulation that can be achieved by the excitation regulator, which enables the heat accumulated after the current of the stator of the generator has been over-current to be sufficiently dissipated. I'set＝ΔI+IsetIncreasing and adjusting the reactive power to the minimum, namely I reaches the minimum, and obtaining a control quantity I through PIDexoutIs larger, i.e. Iexout＞QoutThe control mode is switched to constant reactive power closed-loop control by the overcurrent limitation of the stator current, and the output of the stator current limitation is Qout。
According to the generator stator current overcurrent control method provided by the embodiment of the invention, the active component and the reactive component of the stator current effective value are distinguished, the active component is subjected to multiple judgment in a targeted manner, different overcurrent limiting values are adopted to perform different closed-loop control under the condition that the active component is in different sizes, and the regulation limitation of the reactive component is reasonably utilized, so that different power change conditions in a system are responded, and the system is more stable and reliable. Therefore, the embodiment of the invention solves the technical problems that the stator current overcurrent control loop has poor stability due to the fact that the active power and the reactive power of the stator current are not distinguished in the prior art and the excitation adjusting range is limited.
In order to facilitate understanding, the invention provides an application example of a generator stator current overcurrent control method, taking a generator set of a secondary station of an overpass as an example, an RTDS closed-loop simulation test is carried out on a power oscillation event of the generator set, and a simulation test result of an old generator stator current limiting logic is adopted as shown in fig. 8, so that a fault is reproduced, wherein IA is a generator stator current effective value, PGEN1 is generator active power, QGEN1 is generator reactive power, VMGEN1 is a generator stator voltage effective value, and EFGEN1 is generator excitation voltage. By adopting the control method in the embodiment of the invention to carry out simulation calculation, the result shown in fig. 9 can be obtained, wherein IA is the effective value of the current of the stator of the generator, PGEN1 is the active power of the generator, QGEN1 is the reactive power of the generator, VMGEN1 is the effective value of the voltage of the stator of the generator, and EFGEN1 is the excitation voltage of the generator. When the active power of the excitation system exceeds the maximum value of the gain active component, the control mode is switched to constant reactive power closed-loop control, the reactive power of the unit is controlled to be 0, the stability of the system is ensured, and thus the power oscillation phenomenon does not occur.
For easy understanding, referring to fig. 2, the present invention provides an embodiment of a generator stator current overcurrent control apparatus, including:
the obtaining module 201 is configured to obtain a stator current effective value in operation of the generator set, where the stator current effective value includes an active component and a reactive component;
the first judgment module 202 is configured to perform constant-voltage closed-loop control according to the initial overcurrent limiting value if the active component is smaller than a preset maximum value of the active component;
the second judgment module 203 is configured to perform constant-voltage closed-loop control according to a gain overcurrent limiting value if the active component is between a preset active component maximum value and a gain active component maximum value, where the gain active component maximum value is a product of a first gain coefficient greater than 1 and the preset active component maximum value, and the gain overcurrent limiting value is a sum of an initial overcurrent limiting value and a preset gain amount;
and a third judging module 204, configured to set a given value of the reactive component to zero if the active component is greater than the maximum value of the gain active component, and switch the control mode to constant reactive power closed-loop control according to the gain overcurrent limiting value.
Further, the effective value of the stator current is:
wherein idAs the active component, iqIs the reactive component.
Further, the calculation process of the gain overcurrent limiting value is as follows:
calculating a preset gain according to a gain formula, the active component and a preset maximum value of the active component, wherein the gain formula is as follows:
ΔI＝Kp×(id-id max)；
wherein, Delta I is a preset gain amount, KpIs the second gain factor, idAs the active component, id maxThe maximum value of the preset active component is obtained;
and summing the initial overcurrent limiting value and a preset gain amount to obtain a gain overcurrent limiting value.
The invention also provides a generator stator current overcurrent control device, which comprises a processor and a memory:
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is used for executing the generator stator current overcurrent control method in the above method embodiment according to instructions in the program code.
The invention also provides a computer readable storage medium for storing program code for executing the generator stator current overcurrent control method in the above method embodiment.
The invention also provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the generator stator current overcurrent control method in the above-described method embodiments.
In the embodiments provided in the present invention, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method according to the embodiments of the present invention through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. A generator stator current overcurrent control method is characterized by comprising the following steps:
obtaining a stator current effective value in the running of a generator set, wherein the stator current effective value comprises an active component and a reactive component;
if the active component is smaller than the preset maximum value of the active component, performing constant voltage closed-loop control according to the initial overcurrent limiting value;
if the active component is between the preset active component maximum value and the gain active component maximum value, performing constant voltage closed-loop control according to a gain overcurrent limiting value, wherein the gain active component maximum value is a product of a first gain coefficient which is greater than 1 and the preset active component maximum value, and the gain overcurrent limiting value is the sum of the initial overcurrent limiting value and a preset gain quantity;
and if the active component is larger than the maximum value of the gain active component, setting the given value of the reactive component to zero, and switching the control mode to constant reactive power closed-loop control according to the gain overcurrent limiting value.
2. The generator stator current overcurrent control method according to claim 1, wherein the stator current effective value is:
wherein idFor the active component, iqIs the reactive component.
3. The generator stator current overcurrent control method according to claim 1, wherein the gain overcurrent limit value is calculated by:
calculating the preset gain according to a gain formula, the active component and the preset maximum value of the active component, wherein the gain formula is as follows:
ΔI＝Kp×(id-idmax)；
wherein Δ I is the preset gain amount, KpIs the second gain factor, idFor the active component, idmaxThe preset maximum value of the active component is obtained;
and summing the initial overcurrent limiting value and the preset gain amount to obtain a gain overcurrent limiting value.
4. A generator stator current overcurrent control device is characterized by comprising:
the acquisition module is used for acquiring a stator current effective value in the running of the generator set, wherein the stator current effective value comprises an active component and a reactive component;
the first judgment module is used for carrying out constant voltage closed-loop control according to the initial overcurrent limiting value if the active component is smaller than the preset maximum value of the active component;
the second judgment module is used for carrying out constant-voltage closed-loop control according to a gain overcurrent limiting value if the active component is between the preset active component maximum value and the gain active component maximum value, wherein the gain active component maximum value is the product of a first gain coefficient which is greater than 1 and the preset active component maximum value, and the gain overcurrent limiting value is the sum of the initial overcurrent limiting value and a preset gain quantity;
and the third judgment module is used for setting the given value of the reactive component to zero if the active component is larger than the maximum value of the gain active component, and switching the control mode to constant reactive power closed-loop control according to the gain overcurrent limiting value.
5. Generator stator current over-current control arrangement according to claim 4, wherein said stator current effective value is:
wherein idFor the active component, iqIs the reactive component.
6. The generator stator current overcurrent control apparatus according to claim 4, wherein the gain overcurrent limit value is calculated by:
calculating the preset gain according to a gain formula, the active component and the preset maximum value of the active component, wherein the gain formula is as follows:
ΔI＝Kp×(id-idmax)；
wherein Δ I is the preset gain amount, KpIs the second gain factor, idFor the active component, idmaxThe preset maximum value of the active component is obtained;
and summing the initial overcurrent limiting value and the preset gain amount to obtain a gain overcurrent limiting value.
7. A generator stator current overcurrent control apparatus, comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the generator stator current overcurrent control method of any one of claims 1 to 3 according to instructions in the program code.
8. A computer-readable storage medium for storing program code for executing the generator stator current overcurrent control method according to any one of claims 1 to 3.
9. A computer program product comprising instructions that, when run on a computer, cause the computer to perform the generator stator current overcurrent control method of any one of claims 1 to 3.
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