CN109669342A - The convergence state detection method and device of converter control system, storage medium - Google Patents
The convergence state detection method and device of converter control system, storage medium Download PDFInfo
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- CN109669342A CN109669342A CN201811509923.4A CN201811509923A CN109669342A CN 109669342 A CN109669342 A CN 109669342A CN 201811509923 A CN201811509923 A CN 201811509923A CN 109669342 A CN109669342 A CN 109669342A
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B1/00—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values
- G05B1/01—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric
- G05B1/02—Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric for comparing analogue signals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The embodiment of the present invention discloses the convergence state detection method and device, storage medium of a kind of converter control system.This method includes obtaining the value of feedback of target control variables belonging to multiple phases in converter control system；For each phase, the difference of multiple values of feedback based on the phase in the first predetermined amount of time and preset given value calculates standard deviation, and the first predetermined amount of time includes current time and from the forward N-1 moment at current time, and N is the integer more than or equal to 1；The standard deviation and convergence protection threshold value of multiple phases are compared respectively；According to comparison result, the convergence state of inverter controller is judged.Using the technical solution in the embodiment of the present invention, the False Rate to converter control system convergence state can reduce.
Description
Technical field
The present invention relates to technical field of wind power generation more particularly to a kind of convergence state detection sides of converter control system
Method and device, storage medium.
Background technique
Wind electric converter is the grid-connected core component of wind power generating set electric energy, when control variable is in convergence state,
Wind power converter control system can stable operation.Wherein, control variable is in convergence state and refers to the anti-of control variable
Feedback value follows setting value, and when value of feedback deviates setting value, system is in instability status, and control system will be unstable.
Currently, the protection of converter control system convergence generally uses error protection, by comparing the setting for controlling variable
The size of the error amount of value and value of feedback takes system protection, still, this error protection mode bad adaptability, to current transformer
The False Rate of control system convergence state is higher.
Summary of the invention
The embodiment of the invention provides the convergence state detection method and device of a kind of converter control system, storages to be situated between
Matter can reduce the False Rate to converter control system convergence state.
In a first aspect, the embodiment of the present invention provides a kind of convergence state detection method of converter control system, comprising:
Obtain the value of feedback of target control variables belonging to multiple phases in converter control system；
Multiple values of feedback and preset given value for each phase, based on the phase in the first predetermined amount of time
Difference calculates standard deviation, and the first predetermined amount of time includes current time and from the forward N-1 moment at current time, and N is big
In the integer for being equal to 1；
The standard deviation and convergence protection threshold value of multiple phases are compared respectively；
According to comparison result, the convergence state of inverter controller is judged.
In a kind of possible embodiment of first aspect, according to comparison result, the receipts of converter control system are judged
Hold back state, comprising: if the standard deviation of any phase is greater than convergence protection threshold value in multiple phases, it is determined that converter control system
In abnormal convergence state；If the standard deviation of multiple phases protects threshold value all less than or equal to convergence, it is determined that current transformer control
System processed is in normal convergence state.
In a kind of possible embodiment of first aspect, further includes: if converter control system is in abnormal convergence
State then blocks the modulation pulse of converter control system and executes shutdown operation to wind power generating set.
In a kind of possible embodiment of first aspect, further includes: if converter control system is in the second pre- timing
Between be continuously in abnormal convergence state in section, then block the modulation pulse of converter control system and wind power generating set executed
Shutdown operation, the second predetermined amount of time include current time and the M-1 moment from current time backward, and M is more than or equal to 1
Integer.
In a kind of possible embodiment of first aspect, mesh belonging to multiple phases in converter control system is obtained
The value of feedback of mark control variable, comprising: determine that converter control system is in modulation condition；It acquires more in converter control system
The value of feedback of target control variables belonging to a phase, target control variables include converter control system output electric current or
Output voltage.
Second aspect, the embodiment of the present invention provide a kind of convergence state detection device of converter control system, comprising:
Value of feedback obtains module, for obtaining the anti-of target control variables belonging to multiple phases in converter control system
Feedback value；
Standard deviation computing module, it is multiple anti-in the first predetermined amount of time based on the phase for being directed to each phase
The difference of feedback value and preset given value calculates standard deviation, the first predetermined amount of time include current time and from current time to
N-1 preceding moment, N are the integer more than or equal to 1；
Comparison process module is compared for the standard deviation to multiple phases with convergence protection threshold value respectively；
Condition judgment module, for judging the convergence state of inverter controller according to comparison result.
In a kind of possible embodiment of second aspect, condition judgment module is specifically used for, if appointing in multiple phases
The standard deviation of one phase is greater than convergence protection threshold value, it is determined that converter control system is in abnormal convergence state；If multiple phases
The standard deviation of position protects threshold value all less than convergence is equal to, it is determined that converter control system is in normal convergence state.
It further include fault processing module in a kind of possible embodiment of second aspect, if being controlled for current transformer
System is in abnormal convergence state, then blocks the modulation pulse of converter control system and execute to wind power generating set and shut down behaviour
Make；Alternatively, blocking current transformer control if converter control system is continuously in abnormal convergence state in the second predetermined amount of time
The modulation pulse of system processed and to wind power generating set execute shutdown operation, the second predetermined amount of time include current time and from
The M-1 moment of current time backward, M are the integer more than or equal to 1.
In a kind of possible embodiment of second aspect, the inverter controller of wind power generating set is arranged in device
In.
The third aspect, the embodiment of the present invention provide a kind of computer readable storage medium, are stored thereon with program, program quilt
Processor realizes the convergence state detection device of converter control system as above when executing.
As described above, in embodiments of the present invention, for the convergence state for detecting converter control system, can first be become
The value of feedback for flowing target control variables belonging to multiple phases in device control system, for each phase, based on the phase the
The difference of multiple values of feedback and preset given value in one predetermined amount of time, calculates standard deviation.With the side of conventional error judgement
Formula is compared, standard deviation can accurate response converter control system without departing from extreme value, non-trigger electrode value protection, do not dissipate or send out
The fluctuation situation under very slow etc. operating conditions is dissipated, system convergence can not only be protected, and there is certain Lu Bangxing, energy
The erroneous judgement to system convergence state is enough avoided, to improve accuracy of judgement degree.
Detailed description of the invention
The present invention may be better understood from the description with reference to the accompanying drawing to a specific embodiment of the invention,
In, the same or similar appended drawing reference indicates the same or similar feature.
Fig. 1 be the present embodiments relate to wind power generating set grid connected structure schematic diagram；
Fig. 2 is the schematic diagram of current transformer net side sub-control system provided in an embodiment of the present invention；
Fig. 3 is the process signal of the convergence state detection method for the converter control system that one embodiment of the invention provides
Figure；
Fig. 4 be another embodiment of the present invention provides converter control system convergence state detection method process signal
Figure；
Fig. 5 is the structural schematic diagram of the convergence state detection device of converter control system provided in an embodiment of the present invention.
Specific embodiment
The feature and exemplary embodiment of various aspects of the invention is described more fully below.In following detailed description
In, many details are proposed, in order to provide complete understanding of the present invention.
Fig. 1 be the present embodiments relate to wind power generating set grid connected structure schematic diagram.As shown in Figure 1, wind-force is sent out
Current transformer 100 is provided between motor group and power grid.
Current transformer 100 successively includes rectifier 101, brake unit 102 and inverter 103 from generator side to net side.Its
In, the power module in rectifier 101 includes the full bridge structure of 6 IGBT composition, is generated for generating electricity to wind power generating set
Three-phase alternating current rectified.Brake unit 102 include 2 IGBT composition half-bridge structure, for consume active power with
DC bus-bar voltage is set to maintain stationary value.Power module in inverter 103 includes the full bridge structure of 6 IGBT composition, is used
It is connected to the grid in the direct current after rectification is converted to three-phase alternating current again.
In general, converter control system can be divided into pusher side sub-control system and net side sub-control system, currently, two sons
There is convergence protection in system, be generally mostly extreme value protection, by taking the overcurrent protection of power module as an example, when power module electricity
Stream is more than the threshold value of setting, will trigger overcurrent protection, unit is made to enter failure and shut down；Alternatively, using conventional error
Value is protected, and error refers to that value of feedback subtracts the difference of setting value, indicated with absolute error or relative error, using error value protection
Possibility with erroneous judgement, defencive function bad adaptability.
Fig. 2 is the schematic diagram of current transformer net side sub-control system provided in an embodiment of the present invention.
Wherein, power calculator 201 is according to three phase feedback currents i of current transformer net sideabcWith three-phase feedback voltage uabc, meter
Feedback of Power value Q is calculated, a PI feedback regulator is according to Feedback of Power value Q and power given value QrefObtain reactive current reference
Value iq_ref；Another PI feedback regulator is according to DC bus-bar voltage value of feedback UdcWith DC bus-bar voltage given value Udc_ref, obtain
To reactive current reference value id_ref。
Meanwhile PLL phaselocked loop is according to three phase feedback currents iabcPhase angle θ and angular frequency are obtained, is joined according to reactive current
Examine value iq_refWith busbar voltage given value Udc_refBy e-jθCalculator processing and coordinate system transformation (dq-abc), obtain current transformer
Inverter side given value of current value Iabc, PIR calculator is to current transformer inverter side given value of current value I*abcIt is anti-with current transformer inverter side electric current
Feedback value IabcIt is handled, obtains U∝And Uβ, PWM modulator 202 is according to U∝And UβTo the switch of current transformer net side sub-control system
Device exports PWM modulation wave.
Since there is also below possible for power module electric current:
(1) without departing from extreme value, non-trigger electrode value protection；
(2) fluctuation up and down around setting value has been showed；
(3) control system does not dissipate or dissipates very slow.
Therefore it needs to increase protection: the judgement of setting value and value of feedback departure degree, i.e., constringent judgement.Based on this,
The embodiment of the present invention provides the convergence state detection method and device, storage medium of a kind of converter control system, and the present invention is real
It applies example and is based on standard deviation (Standard Deviation), it, can for carrying out convergence state detection to converter control system
Reduce the False Rate to converter control system convergence state.
Fig. 3 is the process signal of the convergence state detection method for the converter control system that one embodiment of the invention provides
Figure.As shown in Fig. 2, the convergence state detection method includes step 301 to step 304.
In step 301, the value of feedback of target control variables belonging to multiple phases in converter control system is obtained.
Wherein, the control variable in converter control system includes that it exports electric current or output voltage.Refering to fig. 1, it controls
Variable processed can be the three-phase current feedback value (I of 103 net side S1 of invertera, Ib, Ic), i.e. I in Fig. 2abc, or simultaneously
Three-phase voltage value of feedback (the U of S2 at neta, Ub, Uc), i.e. u in Fig. 2abc。
In step 302, for each phase, multiple values of feedback based on the phase in the first predetermined amount of time and pre-
If given value difference, calculate standard deviation.
Wherein, the first predetermined amount of time can be understood as a standard deviation calculating cycle comprising current time and from
Forward N-1 moment at current time, N are the integer more than or equal to 1.
It illustratively, can current feedback values I to N number of momenta, IbAnd IcRespectively with given value of current value Ia*, IbAnd I *c*
Progress continuously makes the difference calculating, obtains N number of error for each phase, and the N number of error for being then based on each phase carries out standard deviation meter
It calculates, for 50 hertz of power grids, standard deviation calculating cycle is 20 milliseconds.
Wherein, data when current transformer is in modulation condition be should be for carrying out the data of standard deviation calculating, specifically,
, can be using the method gone out into, old value be newly worth when carrying out standard deviation calculating, i.e., the error information based on identical quantity carries out every time
Standard deviation calculates, for example, setting error storage array capacity is 20, is then directed to each moment, there is new error information entrance, old
Error information remove, then every time standard deviation calculating can be carried out based on 20 error informations.
The calculation formula of standard deviation sigma is as follows:
Wherein, xiFor error information, μ is error information x1, x2... xNAverage value,.
In step 303, the standard deviation of multiple phases and convergence protection threshold value are compared respectively.
Wherein, convergence protection threshold value can refer to national standard power quality, and grid-connected current harmonic content requires 5% or 10%
It determines, can also be determined according to actual test result.
In step 304, according to comparison result, judge the convergence state of converter control system.
As described above, in embodiments of the present invention, for the convergence state for detecting converter control system, can first be become
The value of feedback for flowing target control variables belonging to multiple phases in device control system, for each phase, based on the phase the
The difference of multiple values of feedback and preset given value in one predetermined amount of time, calculates standard deviation.With the side of conventional error judgement
Formula is compared, standard deviation can accurate response converter control system without departing from extreme value, non-trigger electrode value protection, do not dissipate or send out
The fluctuation situation under very slow etc. operating conditions is dissipated, system convergence can not only be protected, and there is certain Lu Bangxing, energy
The erroneous judgement to system convergence state is enough avoided, to improve accuracy of judgement degree.
For example, illustrating current transformer control system if the standard deviation of any phase is greater than convergence protection threshold value in multiple phases
The control variable perturbations amplitude of system is larger, system unstability, can determine that converter control system is in abnormal convergence state.
Conversely, if the standard deviation of multiple phases illustrates converter control system all less than convergence protection threshold value is equal to
Control variable perturbations amplitude it is normal, system run all right can determine that converter control system is in normal convergence state.
In embodiments of the present invention, the case where being in abnormal convergence state for inverter controller, can block immediately
The modulation pulse of converter control system, and shutdown operation is executed to wind power generating set, failure is quoted ahead of time, while uploading event
Hinder code, avoids direct economic loss caused by current transformer hardware damage and indirect economic loss.
In addition, it is contemplated that in wind power generation set grid-connection operational process, it is understood that there may be because of heave-load device or power network fluctuation
Caused electric current, voltage fluctuation avoid the erroneous judgement to converter control system convergence state for the interference for excluding power network fluctuation,
The failure tolerant time can be increased.
For example, only when converter control system is continuously in abnormal convergence state in the second predetermined amount of time,
It is final to determine that converter control system is in abnormal convergence state really, while blocking the modulation pulse of converter control system simultaneously
Shutdown operation is executed to wind power generating set.
Wherein, the second predetermined amount of time for realizing delay fault tolerance, including current time and from current time to
M-1 moment afterwards, M are the integer more than or equal to 1.
Fig. 4 be another embodiment of the present invention provides converter control system convergence state detection method process signal
Scheme, convergence state detection method shown in Fig. 4 includes step 401 to step 409, for illustrating in the embodiment of the present invention
Convergence state detection method is described in detail.
In step 401, judge whether current transformer is in modulation condition, if current transformer is in modulation condition, execute step
Rapid 302.
In step 402, using the method storage current flow error information being newly worth into old value out.
In step 403, judge whether that reaching a standard deviation calculating cycle thens follow the steps 404 if reaching.
In step 404, the standard deviation of current error in current period is calculated.
In step 405, whether the standard deviation for judging current error in current period is more than error protection value, if so,
Step 406 is executed, if it is not, thening follow the steps 407.
In a step 406, delay counter is cumulative.
In step 407, delay counter is reset.
In a step 408, judge whether delay counter accumulation interval is greater than predetermined delay time, if so, executing step
Rapid 409.
In step 409, trigger converter current on line side deviation is protected, block modulation pulse, and uploads fault code.
Fig. 5 is the structural schematic diagram of the convergence state detection device of converter control system provided in an embodiment of the present invention,
As shown in figure 5, the convergence state detection device includes: that value of feedback obtains module 501, standard deviation computing module 502, compares processing
Module 503 and condition judgment module 504.
Wherein, value of feedback obtains module 501 for obtaining target control belonging to multiple phases in converter control system
The value of feedback of variable.
Standard deviation computing module 502 is used to be directed to each phase, multiple in the first predetermined amount of time based on the phase
The difference of value of feedback and preset given value calculates standard deviation, and the first predetermined amount of time includes current time and from current time
Forward N-1 moment, N are the integer more than or equal to 1.
Comparison process module 503 is used to be compared the standard deviation of multiple phases respectively with convergence protection threshold value.
Condition judgment module 504 is used to judge the convergence state of inverter controller according to comparison result.State judges mould
Block 504 is specifically used for, if the standard deviation of any phase is greater than convergence protection threshold value in multiple phases, it is determined that current transformer control system
System is in abnormal convergence state；If the standard deviation of multiple phases protects threshold value all less than convergence is equal to, it is determined that current transformer control
System processed is in normal convergence state.
In one alternate embodiment, convergence state detection device further includes fault processing module, if being used for current transformer control
System processed is in abnormal convergence state, then blocks the modulation pulse of converter control system and execute shutdown to wind power generating set
Operation；Alternatively, blocking current transformer if converter control system is continuously in abnormal convergence state in the second predetermined amount of time
The modulation pulse of control system and to wind power generating set execute shutdown operation, the second predetermined amount of time include current time and
From the M-1 moment of current time backward, M is the integer more than or equal to 1.
It should be noted that above-mentioned convergence state detection device can integrate the inverter controller in wind power generating set
In, to avoid the transformation to hardware, it is also possible to the logical device with operation independent function, herein without limitation.
In addition, the embodiment of the present invention also provides a kind of computer readable storage medium, it is stored thereon with program, program is located
Reason device realizes the convergence state detection device of converter control system as above when executing.
It should be clear that all the embodiments in this specification are described in a progressive manner, each embodiment it
Between the same or similar part may refer to each other, the highlights of each of the examples are it is different from other embodiments it
Place.For device embodiment, related place may refer to the declaratives of embodiment of the method.Not office of the embodiment of the present invention
It is limited to particular step and structure described above and shown in figure.Those skilled in the art can understand the present invention in fact
It after the spirit for applying example, is variously modified, modification and addition, or the sequence between changing the step.Also, it is risen in order to concise
See, omits the detailed description to known method technology here.
Functional block shown in above structural block diagram can be implemented as hardware, software, firmware or their combination.When
When realizing in hardware, electronic circuit, specific integrated circuit (ASIC), firmware appropriate, plug-in unit, function may, for example, be
Card etc..When being realized with software mode, the element of the embodiment of the present invention is used to execute program or the generation of required task
Code section.Perhaps code segment can store in machine readable media program or the data-signal by carrying in carrier wave is passing
Defeated medium or communication links are sent." machine readable media " may include any medium for capableing of storage or transmission information.
The example of machine readable media includes electronic circuit, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), soft
Disk, CD-ROM, CD, hard disk, fiber medium, radio frequency (RF) link, etc..Code segment can be via such as internet, inline
The computer network of net etc. is downloaded.
The embodiment of the present invention can be realized in other specific forms, without departing from its spirit and essential characteristics.For example, special
Determining algorithm described in embodiment can be modified, and system architecture is without departing from the substantially smart of the embodiment of the present invention
Mind.Therefore, current embodiment is all counted as being exemplary rather than limited, the model of the embodiment of the present invention in all respects
It encloses by appended claims rather than foregoing description defines, also, falls into the meaning of claim and complete in the range of equivalent
Portion changes all to be included among the range of the embodiment of the present invention.
Claims (10)
1. a kind of convergence state detection method of converter control system, wherein include:
Obtain the value of feedback of target control variables belonging to multiple phases in converter control system；
For each phase, the difference of multiple values of feedback and preset given value based on the phase in the first predetermined amount of time
Value calculates standard deviation, and first predetermined amount of time includes current time and from the forward N-1 moment at current time, and N is
Integer more than or equal to 1；
The standard deviation and convergence protection threshold value of the multiple phase are compared respectively；
According to comparison result, the convergence state of the converter control system is judged.
2. according to the method described in claim 1, wherein, according to comparison result, judging the convergence of the converter control system
State, comprising:
If the standard deviation of any phase is greater than convergence protection threshold value in the multiple phase, it is determined that the current transformer control
System is in abnormal convergence state；
If the standard deviation of the multiple phase protects threshold value all less than or equal to the convergence, it is determined that the current transformer control
System is in normal convergence state.
3. according to the method described in claim 1, wherein, further includes:
If the converter control system is in abnormal convergence state, the modulation pulse of the converter control system is blocked simultaneously
Shutdown operation is executed to wind power generating set.
4. according to the method described in claim 1, wherein, further includes:
If the converter control system is continuously in abnormal convergence state in the second predetermined amount of time, the unsteady flow is blocked
The modulation pulse of device control system simultaneously executes shutdown operation to wind power generating set, when second predetermined amount of time includes current
It carves and the M-1 moment from current time backward, M is the integer more than or equal to 1.
5. according to the method described in claim 1, wherein, target belonging to multiple phases in the acquisition converter control system
Control the value of feedback of variable, comprising:
Determine that the converter control system is in modulation condition；
The value of feedback of target control variables belonging to multiple phases in the converter control system is acquired, the target control becomes
Amount includes the output electric current or output voltage of the converter control system.
6. a kind of convergence state detection device of converter control system, wherein include:
Value of feedback obtains module, for obtaining the feedback of target control variables belonging to multiple phases in converter control system
Value；
Standard deviation computing module, for being directed to each phase, multiple values of feedback based on the phase in the first predetermined amount of time
Calculate standard deviation with the difference of preset given value, first predetermined amount of time include current time and current time forward
N-1 moment, N is integer more than or equal to 1；
Comparison process module is compared for the standard deviation to the multiple phase with convergence protection threshold value respectively；
Condition judgment module, for judging the convergence state of the converter control system according to comparison result.
7. device according to claim 6, wherein the condition judgment module is specifically used for, if in the multiple phase
The standard deviation of any phase is greater than the convergence and protects threshold value, it is determined that the converter control system is in abnormal convergence shape
State；If the standard deviation of the multiple phase protects threshold value all less than the convergence is equal to, it is determined that current transformer control system
System is in normal convergence state.
8. device according to claim 6, wherein further include: fault processing module, if for current transformer control system
System then blocks the modulation pulse of the converter control system and executes shutdown to wind power generating set in abnormal convergence state
Operation；Alternatively, blocking institute if the converter control system is continuously in abnormal convergence state in the second predetermined amount of time
It states the modulation pulse of converter control system and shutdown operation is executed to wind power generating set, second predetermined amount of time includes
The M-1 moment of current time and current time backward, M are the integer more than or equal to 1.
9. according to the described in any item devices of claim 6-8, wherein the current transformer of wind power generating set is arranged in described device
In controller.
10. a kind of computer readable storage medium, is stored thereon with program, which is characterized in that real when program is executed by processor
The now convergence state detection method of the converter control system as described in claim 1-5 any one.
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| CN112698570A (en) * | 2020-12-09 | 2021-04-23 | 河南知汇电力技术有限公司 | PI control system and method based on empirical error |
| CN112751317A (en) * | 2019-10-31 | 2021-05-04 | 北京金风科创风电设备有限公司 | Wind generating set short circuit detection method and device, storage medium and protection system |
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| 刘胜 等: "船舶航向GA-PID自适应控制研究", 《系统仿真学报》 * |
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| CN112147504A (en) * | 2019-06-27 | 2020-12-29 | 北京金风科创风电设备有限公司 | Converter fault detection method and device and computer equipment |
| CN112147504B (en) * | 2019-06-27 | 2024-02-23 | 北京金风科创风电设备有限公司 | Fault detection method and device for converter and computer equipment |
| CN112751317A (en) * | 2019-10-31 | 2021-05-04 | 北京金风科创风电设备有限公司 | Wind generating set short circuit detection method and device, storage medium and protection system |
| CN112751317B (en) * | 2019-10-31 | 2023-08-22 | 北京金风科创风电设备有限公司 | Short circuit detection method and device for wind generating set, storage medium and protection system |
| CN112698570A (en) * | 2020-12-09 | 2021-04-23 | 河南知汇电力技术有限公司 | PI control system and method based on empirical error |
| CN112698570B (en) * | 2020-12-09 | 2023-03-10 | 河南知汇电力技术有限公司 | PI control system and method based on empirical error |
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