CN111146990A - Generator excitation control method and device for inhibiting subsynchronous oscillation - Google Patents
Generator excitation control method and device for inhibiting subsynchronous oscillation Download PDFInfo
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- CN111146990A CN111146990A CN202010099399.9A CN202010099399A CN111146990A CN 111146990 A CN111146990 A CN 111146990A CN 202010099399 A CN202010099399 A CN 202010099399A CN 111146990 A CN111146990 A CN 111146990A
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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
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
Abstract
The invention discloses a generator excitation control method and a generator excitation control device for inhibiting subsynchronous oscillation, wherein the method comprises the following steps: calculating to obtain an excitation current adjustment value according to the average rotating speed of the mechanical shafting and the rotating speed of the generator; adjusting the instantaneous reference value of the exciting current according to the adjusting value of the exciting current, and calculating to obtain the reference value of the exciting current; and calculating an excitation voltage reference value according to the excitation current reference value and the excitation current measured value and outputting the excitation voltage reference value. By implementing the invention, the electromagnetic torque can be adjusted by controlling the excitation voltage reference value, and the additional damping of the vibration mode is actually added to the mechanical shafting of the generator, which is equivalent to changing the structure of the system and stabilizing the original unstable system structure. Therefore, the control effect of the generator excitation control method adopting instantaneous value control is far better than that of average value control in terms of reaction speed and final stability.
Description
Technical Field
The invention relates to the technical field of power systems, in particular to a generator excitation control method and device for inhibiting subsynchronous oscillation.
Background
The subsynchronous oscillation of the power system is amplified oscillation caused by the fact that the natural frequency of a mechanical shafting of a generator is complementary with the resonant frequency of a power grid. Serious subsynchronous oscillation can directly cause serious damage to a rotor shaft system of a large-scale turbonator, so that serious accidents are caused, and the safe and stable operation of a power system is endangered.
With the development of power electronics technology, methods for suppressing subsynchronous oscillation by injecting a modal current into a generator using a FACTS apparatus have gradually appeared. The method specifically comprises the steps of detecting vibration modes of a generator shaft system by adopting a rotating speed sensor to obtain oscillation components of each torsional vibration mode. And forming a reference value of the injection current after the measured oscillation component passes through a proportional phase shifting link. The injection mode of the modal current can be divided into two modes according to the difference of the current injection positions. One is to inject a modal current into the rotor winding, i.e., the field winding, and this method is called an additional field damping controller (SEDC). Another is to inject a modal current at the stator winding side, such as a method using an additional subsynchronous damping controller (SSDC) for dc transmission, and to suppress subsynchronous oscillation currents at the stator side using a static synchronous compensator (STATCOM).
The existing modal current injection method is implemented by detecting a vibration mode and then injecting an opposite modal current, wherein the average value (or amplitude) of the modal current is controlled. The subsynchronous oscillation suppression method based on average value feedback has very limited control speed and control effect because a time window is needed for calculating the average value of the modal current, and only subsynchronous oscillation with small amplitude which is not divergent can be suppressed. But the method can not be applied to the divergent subsynchronous oscillation phenomenon caused by the structural reason of the system and the large disturbance caused by the fault.
Disclosure of Invention
In view of this, embodiments of the present invention provide a generator excitation control method and apparatus for suppressing sub-synchronous oscillation, so as to solve the problem that the divergent sub-synchronous oscillation phenomenon caused by large disturbance due to a fault cannot be solved by a method of injecting a modal current in the prior art.
The technical scheme provided by the invention is as follows:
the first aspect of the embodiments of the present invention provides a generator excitation control method for suppressing subsynchronous oscillation, where the generator excitation control method includes the following steps: calculating according to the average rotating speed of the mechanical shafting and the rotating speed of the generator to obtain an excitation current adjusting value; adjusting the instantaneous reference value of the exciting current according to the adjusting value of the exciting current, and calculating to obtain the reference value of the exciting current; and calculating an excitation voltage reference value according to the excitation current reference value and the excitation current measured value and outputting the excitation voltage reference value.
Optionally, the adjusting the instantaneous reference value of the excitation current according to the excitation current adjustment value further includes: measuring the voltage of the generator to obtain a measured value of the voltage of the generator; and performing proportional integral calculation according to the difference value of the generator voltage measured value and the generator voltage reference value to obtain an excitation current reference value.
Alternatively, the generator average speed is calculated by the following formula:
wherein, a1、a2、a3、a4、a5、a6Is the velocity feedback coefficient, ω1、ω2、ω3、ω4、ω5、ω6And the rotating speed of each mass block of the mechanical shaft system is shown.
Optionally, calculating to obtain an excitation current adjustment value according to the average rotating speed of the mechanical shafting and the rotating speed of the generator, including calculating to obtain a rotating speed difference value according to the average rotating speed of the mechanical shafting and the rotating speed of the generator; and calculating to obtain an excitation current adjusting value according to the rotation speed difference value and the first proportional coefficient.
Optionally, calculating an excitation voltage reference value according to the excitation current reference value and the excitation current measurement value, and outputting the excitation voltage reference value, including: calculating to obtain an excitation current difference value according to the excitation current reference value and the excitation current measured value; calculating the excitation current difference value according to a second proportionality coefficient and an amplitude limiting link to obtain an excitation voltage reference value; and outputting the excitation voltage reference value by adopting a power electronic exciter.
A second aspect of an embodiment of the present invention provides a generator excitation control apparatus that suppresses subsynchronous oscillation, the generator excitation control including: the adjusting value calculating module is used for calculating to obtain an exciting current adjusting value according to the average rotating speed of the mechanical shafting and the rotating speed of the generator; the excitation current reference value calculating module is used for adjusting an excitation current instantaneous reference value according to the excitation current adjusting value and calculating to obtain an excitation current reference value; and the excitation voltage reference value calculating module is used for calculating and obtaining an excitation voltage reference value according to the excitation current reference value and the excitation current measured value and outputting the excitation voltage reference value.
A third aspect of the embodiments of the present invention provides a computer-readable storage medium, where computer instructions are stored, where the computer instructions are configured to cause a computer to execute a generator excitation control method for suppressing subsynchronous oscillation according to any one of the first aspect and the first aspect of the embodiments of the present invention.
A fourth aspect of an embodiment of the present invention provides a generator excitation control terminal that suppresses subsynchronous oscillation, including: the generator excitation control method for suppressing subsynchronous oscillation according to any one of the first aspect and the first aspect of the embodiments of the present invention is implemented by executing computer instructions stored in a memory and a processor, which are communicatively connected with each other.
The technical scheme provided by the invention has the following technical effects:
the generator excitation control method and the generator excitation control device for inhibiting subsynchronous oscillation provided by the embodiment of the invention can adjust the electromagnetic torque by controlling the excitation voltage, and the control method actually adds additional damping of a vibration mode to a mechanical shafting of the generator, namely changes the structure of a system, so that the original unstable system structure is stabilized. Therefore, the control effect of the generator excitation control method for suppressing subsynchronous oscillation provided by the embodiment of the invention by adopting instantaneous value control is far better than that of average value control in terms of reaction speed and final stability. Even for large disturbances and divergent subsynchronous oscillation phenomena, in the case of unsaturated output of the excitation controller, the first scaling factor k1 and the second scaling factor k2 can be adjusted as required, and the control method can achieve obvious suppression effect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a flow chart of a generator excitation control method to suppress subsynchronous oscillations in accordance with an embodiment of the present invention;
FIG. 2 is a flow chart of a generator excitation control method to suppress subsynchronous oscillations in accordance with another embodiment of the present invention;
FIG. 3 is a schematic diagram of an application model of a generator excitation control method for suppressing subsynchronous oscillation according to an embodiment of the invention;
FIG. 4 is a shafting equation root trajectory diagram of a generator excitation control method for suppressing subsynchronous oscillation according to an embodiment of the invention;
FIG. 5 is a schematic root-trace diagram of mode 2 of a generator excitation control method to suppress subsynchronous oscillations in accordance with an embodiment of the invention;
fig. 6 is a block diagram of a generator excitation control apparatus that suppresses subsynchronous oscillation according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a hardware structure of a generator excitation control terminal for suppressing subsynchronous oscillation according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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 some, but not all, embodiments of the present invention. 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.
An embodiment of the present invention provides a generator excitation control method for suppressing subsynchronous oscillation, and as shown in fig. 1, the generator excitation control method includes the following steps:
step S101: and calculating to obtain an excitation current adjusting value according to the average rotating speed of the mechanical shafting and the rotating speed of the generator.
In one embodiment, as shown in FIG. 2, the average rotation speed ω can be determined according to the mechanical axis systemmeanAnd generator speed omega5Calculating to obtain a rotation speed difference value; and calculating to obtain an excitation current adjusting value according to the rotation speed difference value and the first proportion coefficient k1, and specifically, multiplying the rotation speed difference value by the first proportion system k1 to obtain the excitation current adjusting value. First ratio systemThe value of system k1 may be set based on actual system parameters.
Alternatively, the mechanical shafting average rotational speed may be calculated by the following formula:
wherein, a1、a2、a3、a4、a5、a6Is the velocity feedback coefficient, ω1、ω2、ω3、ω4、ω5、ω6And the rotating speed of each mass block of the mechanical shaft system is shown.
Step S102: and adjusting the instantaneous reference value of the exciting current according to the adjusting value of the exciting current, and calculating to obtain the reference value of the exciting current.
In one embodiment, as shown in FIG. 2, the generator voltage may be measured to obtain a measured generator voltage value u before the instantaneous field current reference value is adjustedline_measure(ii) a Then according to the measured value u of the generator voltageline_measureAnd a generator voltage reference uline_refAnd (4) carrying out proportional integral calculation to obtain an instantaneous reference value of the exciting current. Specifically, the generator voltage reference value u is setline_refI.e. generator voltage set point and generator voltage measured value uline_measureAnd after addition, the signals are input into a proportional integrator PI for proportional integral calculation to obtain an instantaneous reference value of the exciting current. Then, the instantaneous reference value of the exciting current and the adjusting value of the exciting current can be added to obtain the reference value i of the exciting currentf_ref。
Step S103: and calculating an excitation voltage reference value according to the excitation current reference value and the excitation current measured value and outputting the excitation voltage reference value.
In one embodiment, as shown in FIG. 2, the reference value i may be based on the excitation currentf_refAnd field current measurement value if_measureCalculating to obtain an excitation current difference value; and calculating according to the excitation current difference and a second proportionality coefficient k2, and obtaining an excitation voltage reference value through an amplitude limiting link.
In particular, the exciter can be usedReference value of magnetic current if_refAnd field current measurement value if_measureAnd obtaining an excitation current difference value by subtracting, multiplying the excitation current difference value by a second proportional coefficient k2, and obtaining an excitation voltage reference value through an amplitude limiting link. The value of the second proportional system k2 can be set as desired. Wherein, the amplitude limiting step is to limit the amplitude of the value obtained by multiplying the difference value of the exciting current by the second proportionality coefficient k2, for example, setting the amplitude limiting interval to [ -10,10 [)]Indicating that the maximum output is 10, the minimum output is-10, and if the input is between-10 and 10, the output is equal to the input.
The generator excitation control method for inhibiting subsynchronous oscillation provided by the embodiment of the invention can adjust the electromagnetic torque through the excitation voltage reference value, and the control method actually adds additional damping of a vibration mode to a mechanical shafting of the generator, which is equivalent to changing the structure of a system and stabilizing the original unstable system structure. Therefore, the control effect of the generator excitation control method for suppressing subsynchronous oscillation provided by the embodiment of the invention by adopting instantaneous value control is far better than that of average value control in terms of reaction speed and final stability. Even for large disturbances and divergent subsynchronous oscillation phenomena, in the case that the output of the excitation controller is not saturated, the first scaling factor k1 and the second scaling factor k2 can be adjusted as required, so that the control method can achieve obvious suppression effect.
The following IEEE subsynchronous oscillation first standard model is an example, and a generator excitation control method for suppressing subsynchronous oscillation according to an embodiment of the present invention is described in detail.
As shown in fig. 3, which is a schematic structural diagram of the first standard model, the module may be represented as a single machine G (including an HP high-pressure cylinder, an IP intermediate-pressure cylinder, a LAP low-pressure cylinder A, LBP low-pressure cylinder B, GEN generator, and an EXC exciter) of a six-mass shafting, and connected to an INFINITE power supply system (INFINITE BUS) through LC series compensation. Because the resonant frequency of the LC series compensation is complementary with the inherent frequency of the six-mass-block shafting, and the sum of the two frequencies is equal to the power frequency (60Hz), the shafting of the generator can continuously increase the mechanical oscillation process in the normal operation process of the generator, and the safety of the generator is finally damaged. The vibration of the six-mass system can be decomposed into six modes, and the natural frequencies of the six modes are 15.71Hz,20.21Hz,25.55Hz,32.29Hz,47.46Hz and 0.00 Hz. Where the natural frequency of mode 2, 20.21Hz, is complementary to the resonant frequency of the LC series. So what diverges in the first standard model is the mode 2 vibration.
For the six-mass-block shafting module, the damping on the shafting is generally negligible. Therefore, the mechanical shafting dynamic equation can be expressed by formula (2).
Wherein θ ═ θ1θ2θ3θ4θ5θ6]TIs the angular displacement vector of the mechanical axis system,
represents the vector of the angular velocity and is,
representing angular acceleration vector, moment of inertia matrix
JiIs the moment of inertia of the mass No. i. Rigidity matrix
KijIs the elastic coefficient between the mass block i and the mass block j. Torque vector T ═ T1T2T3T4TE0]T. T when the mechanical shafting is in steady operationE＝-T1-T2-T3-T4And the direction of the rotation of the shafting is a positive direction when the generator is in steady-state operation.
When the electromagnetic torque is adjusted using the excitation voltage, T can be assumedE＝-T1-T2-T3-T4+ΔTE_fWherein Δ TE_fThe controllable additional electromagnetic torque is used for inhibiting the modal vibration of the mechanical shafting.
Therefore, the additional electromagnetic torque and the average rotation speed of the mechanical shafting can be expressed by formula (3).
Wherein d is a negative feedback coefficient in the unit of N.m.s/rad. a is1、a2、a3、a4、a5、a6Is a speed feedback coefficient and can be configured according to the actual arrangement condition of the sensors. Here, a may be assumed first1、a2、a3、a4、a5、a6Are all equal to 1. Namely, it is
For the above assumptions, it is first verified whether it has an influence on the steady-state operation condition and on the vibration mode.
Substituting the formula (4) into the formula (2) to obtain the formula (5)
Wherein
T＝[T1T2T3T4(-T1-T2-T3-T4)0]T。
Compared with the formula (2), the formula (5) is equivalent to adding an additional damping matrix D. Since the feedback controlled electromagnetic torque can only be applied to the generator, which is the fifth mass, only the fifth row of the damping matrix D is a non-zero element. The equation (5) is transformed into equation (6), and then the stability of equation (4) can be studied by studying the characteristic root of equation (6).
When the negative feedback coefficient d is from 0 to 5 × 106When N.m.s/rad is varied, the root locus of equation (6) can be obtained. As shown in FIG. 4, when d>At 0, except for the dual root on the zero coordinate, all characteristic roots are on the left half plane, which shows that the electromagnetic torque negative feedback applied by the formula (4) provides positive damping for all vibration modes, and the whole mechanical system is stable. In practical applications, it is possible to redesign equation (3) for different sensor arrangements, such as when the speed sensor of mass 3 fails or no sensor is arranged, there is a30. But as long as its root trajectory is in the left half of the complex plane, it is possible to stabilize the system. If the root track corresponding to each mode is on the right half plane of the complex plane, the feedback coefficient of the rotating speed of the shafting needs to be readjusted, and finally the root track needs to be on the left half plane.
The above analysis is made ignoring the influence of LC series compensation of the electrical part on the motor shafting. The situation is somewhat complicated when considering the effect of LC crosstalk. But since the mechanical axis system is a linear system, it can still be analyzed according to the superposition principle: assuming that the micro disturbance current on the LC series compensation is delta i when the generator is in steady-state operationabc(t) the amount of current disturbance on the d-and q-axes of the generator after dq conversion is Δ id(t) and Δ iq(T) the disturbance amount of the electromagnetic torque caused thereby is Δ TE_dq(Δid,Δiq) The disturbance quantity is related to Δ idAnd Δ iqIn the first standard model, and Δ T in the first standard modelE_dq(Δid,Δiq) Is the same as the natural frequency of mode 2, so at the time of subsynchronous oscillation, Δ TE_dq(Δid,Δiq) This is the cause of the increase in the energy of the shafting mode 2.
As shown in fig. 5, for the root locus of mode 2, the abscissa (real part of the characteristic root) represents the vibration mode amplitude (and the mode shape root)Speed) of decay under negative feedback. Due to Delta TE_dqThe method is bounded, so that a positive real number delta can be always found, when the real part of a characteristic root is smaller than-delta, the attenuation speed of the vibration amplitude is greater than the gain speed of an electric part to the vibration amplitude under the negative feedback action, and the value range of a coefficient d for stabilizing a system is d1<d<d2。
On the other hand, the output of a real controller is always bounded, and the controller has an output saturation phenomenon, Δ TE_fCan only be adjusted within a certain range. Let coefficient d be assumed>d3In time, the controller will saturate, and the value range of d should be d1<d<d3. As can be seen from fig. 5, as long as d3>d1Stable control of the power system can be achieved.
Therefore, according to the analysis and calculation, the generator excitation control method for suppressing the subsynchronous oscillation provided by the embodiment of the invention can be used for actually increasing the additional damping of the vibration mode for the mechanical shafting of the generator when the electromagnetic torque is adjusted by adopting the excitation voltage reference value, which is equivalent to changing the structure of the system and can achieve better stability. Meanwhile, even for large disturbance and a divergent subsynchronous oscillation phenomenon, the control method can achieve obvious inhibition effect only under the condition that the output of the excitation controller is not saturated.
In one embodiment, the electromagnetic torque for the synchronous generator may be represented by equation (7) in the Park coordinate system.
Wherein idAnd ΨdIs d-axis current and flux, iqAnd ΨqIs the q-axis current and flux linkage.
In dq coordinates, the relationship between flux linkage and current can be expressed as equation (8).
Wherein
Can be used to represent the inductance matrix in dq coordinates.
Thus d-axis flux linkage Ψ for the generatordAnd q-axis flux linkage ΨqCan be expressed as equation (9) in terms of current.
Wherein ifIs the current of the field winding f, iD、ig、iQCurrents in damping windings D, g, Q, respectively, LdAnd LqIs self-inductance of d-and q-axes, LdfIs the mutual inductance between the d and f windings, LdDIs the mutual inductance between the D and D windings, LqgIs the mutual inductance between the q and g windings, LqQIs the mutual inductance between the Q and Q windings.
By substituting equation (9) into equation (7), equation (10) can be calculated.
In the case of small perturbations, i can be considered to beq，id，ig，iD，iQWhen the state quantity is approximate to a steady state value, if the exciting current increment delta i can be controlledfThen, the amount of change in the electromagnetic torque due to the increase in the exciting current is Δ TE＝1.5LdfiqΔif. It can be seen that i is onlyqIs unchanged in sign, TEAnd ifThere is a monotonic correlation between i when ifAt increasing time, TEAnd also increases.
Meanwhile, considering the relationship between the winding current and the winding flux linkage, the excitation current may be expressed as equation (12) as shown in equation (11).
if＝ΓfdΨd+ΓfΨf+ΓfDΨDFormula (12)
Wherein
Matrix gammaparkPosition of non-zero element and LparkThe same is true. Therefore, when the excitation flux linkage is increased by Δ ΨfThe increase of exciting current caused is delta if＝ΓfΔΨf. Excitation current ifWith excitation flux linkage ΨfThere is a monotonic correlation between them, i.e. when ΨfAt increasing time, ifAnd also increases. And due to the excitation flux linkage psif＝∫ufdt, so that the pair Ψ can be realized by rapidly adjusting the excitation voltagefAnd ifTo finally realize the control of TEAnd (4) controlling.
Therefore, it can be seen from the above analysis and calculation that the generator excitation control method for suppressing subsynchronous oscillation according to the embodiments of the present invention can adjust the electromagnetic torque by controlling the excitation voltage, and specifically, when the reference value of the excitation voltage input to the generator changes monotonically, the excitation flux linkage can change monotonically; the monotonous correlation exists between the exciting current and the exciting flux linkage, so that the exciting current can be monotonously changed by the monotonous changing exciting voltage reference value; meanwhile, a monotonicity relation exists between the exciting current and the electromagnetic torque of the generator, so that the electromagnetic torque can be monotonously changed by the monotonously changing exciting voltage. Therefore, the generator excitation control method for suppressing the subsynchronous oscillation provided by the embodiment of the invention can realize the adjustment of the instantaneous value of the electromagnetic torque of the generator, thereby suppressing the subsynchronous oscillation phenomenon.
An embodiment of the present invention further provides a generator excitation control device for suppressing subsynchronous oscillation, as shown in fig. 6, the device includes:
the adjusting value calculating module 1 is used for calculating an exciting current adjusting value according to the average rotating speed of the mechanical shafting and the rotating speed of the generator; for details, refer to the related description of step S101 in the above method embodiment.
The excitation current reference value calculating module 2 is used for adjusting an excitation current instantaneous reference value according to the excitation current adjusting value and calculating to obtain an excitation current reference value; for details, refer to the related description of step S102 in the above method embodiment.
The excitation voltage reference value calculation module 3 is used for calculating an excitation voltage reference value according to the excitation current reference value and the excitation current measurement value and outputting the excitation voltage reference value; for details, refer to the related description of step S103 in the above method embodiment.
The functional description of the generator excitation control device for suppressing the subsynchronous oscillation provided by the embodiment of the invention refers to the generator excitation control method for suppressing the subsynchronous oscillation in the above embodiment in detail.
The generator excitation control terminal for suppressing the subsynchronous oscillation may include, as shown in fig. 7, a processor 51 and a memory 52, where the processor 51 and the memory 52 may be connected by a bus or in another manner, and fig. 7 takes the connection by the bus as an example.
The processor 51 may be a Central Processing Unit (CPU). The Processor 51 may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or combinations thereof.
The memory 52, which is a non-transitory computer readable storage medium, may be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as the corresponding program instructions/modules in the embodiments of the present invention. The processor 51 executes various functional applications and data processing of the processor by running non-transitory software programs, instructions and modules stored in the memory 52, that is, implements the generator excitation control method of suppressing subsynchronous oscillation in the above-described method embodiments.
The memory 52 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor 51, and the like. Further, the memory 52 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory 52 may optionally include memory located remotely from the processor 51, and these remote memories may be connected to the processor 51 via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The one or more modules are stored in the memory 52 and, when executed by the processor 51, perform a generator excitation control method that suppresses subsynchronous oscillations as in the embodiment shown in fig. 1.
The specific details of the generator excitation control terminal for suppressing the subsynchronous oscillation may be understood by referring to the corresponding related description and effects in the embodiment shown in fig. 1, and are not described herein again.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
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 invention, and such modifications and variations fall within the scope defined by the appended claims.
Claims (8)
1. A generator excitation control method for suppressing subsynchronous oscillation is characterized by comprising the following steps of:
calculating to obtain an excitation current adjustment value according to the average rotating speed of the mechanical shafting and the rotating speed of the generator;
adjusting the instantaneous reference value of the exciting current according to the adjusting value of the exciting current, and calculating to obtain the reference value of the exciting current;
and calculating an excitation voltage reference value according to the excitation current reference value and the excitation current measured value and outputting the excitation voltage reference value.
2. The generator excitation control method for suppressing subsynchronous oscillation according to claim 1, wherein an excitation current instantaneous reference value is adjusted according to the excitation current adjustment value, and before, further comprising:
measuring the voltage of the generator to obtain a measured value of the voltage of the generator;
and performing proportional integral calculation according to the difference value of the generator voltage measured value and the generator voltage reference value to obtain an excitation current instantaneous reference value.
3. The generator excitation control method for suppressing subsynchronous oscillation according to claim 1, wherein the average rotation speed of the mechanical shafting is calculated by the following formula:
wherein, a1、a2、a3、a4、a5、a6Is the velocity feedback coefficient, ω1、ω2、ω3、ω4、ω5、ω6And the rotating speed of each mass block of the generator shafting is represented.
4. The generator excitation control method for suppressing subsynchronous oscillation according to claim 1, wherein calculating an excitation current adjustment value according to the average rotation speed of the mechanical shafting and the rotation speed of the generator comprises:
calculating to obtain a rotating speed difference value according to the average rotating speed of the mechanical shafting and the rotating speed of the generator;
and calculating to obtain an excitation current adjusting value according to the rotation speed difference value and the first proportional coefficient.
5. The generator excitation control method for suppressing subsynchronous oscillation according to claim 1, wherein calculating and outputting an excitation voltage reference value according to the excitation current reference value and an excitation current measurement value comprises:
calculating to obtain an excitation current difference value according to the excitation current reference value and the excitation current measured value;
calculating the excitation current difference value according to a second proportionality coefficient and an amplitude limiting link to obtain an excitation voltage reference value;
and outputting the excitation voltage reference value by adopting a power electronic exciter.
6. A generator excitation control device that suppresses subsynchronous oscillation, comprising:
the adjusting value calculating module is used for calculating to obtain an exciting current adjusting value according to the average rotating speed of the mechanical shafting and the rotating speed of the generator;
the excitation current reference value calculating module is used for adjusting an excitation current instantaneous reference value according to the excitation current adjusting value and calculating to obtain an excitation current reference value;
and the excitation voltage reference value calculating module is used for calculating and obtaining an excitation voltage reference value according to the excitation current reference value and the excitation current measured value and outputting the excitation voltage reference value.
7. A computer-readable storage medium storing computer instructions for causing a computer to execute the method for generator excitation control with subsynchronous oscillation suppression according to any one of claims 1 to 5.
8. A generator excitation control terminal for suppressing subsynchronous oscillation, comprising: a memory and a processor, the memory and the processor being communicatively connected to each other, the memory storing computer instructions, the processor executing the computer instructions to perform the generator excitation control method of suppressing subsynchronous oscillation according to any one of claims 1 to 5.
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