CN114825330A - Additional damping control method, device and system for inhibiting active low-frequency oscillation - Google Patents
Additional damping control method, device and system for inhibiting active low-frequency oscillation Download PDFInfo
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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
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
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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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1885—Arrangements for adjusting, eliminating or compensating reactive power in networks using rotating means, e.g. synchronous generators
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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
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/48—Controlling the sharing of the in-phase component
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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Abstract
The invention discloses an additional damping control method, a device and a system for inhibiting active low-frequency oscillation. The invention provides excitation additional damping control for a phase modulator, which can exert the influence capability of the phase modulator on the dynamic stability of active power low-frequency oscillation, thereby being capable of utilizing phase modulators with different capacities, which are put into operation in the prior art and are gradually put into operation in the future, in a system to participate in restraining the low-frequency oscillation of the system.
Description
Technical Field
The invention relates to an additional damping control method and an additional damping control device for inhibiting system active power low-frequency oscillation in dynamic stability control of a power system, in particular to an additional damping control method, an additional damping control device and an additional damping control system for inhibiting active low-frequency oscillation, and belongs to the technical field of electrical engineering.
Background
In recent years, new energy such as wind power, photovoltaic and the like in China is developed in a blowout mode, the installed capacity ratio of the new energy in a power grid is increased day by day, and a large-scale new energy base and long-distance large-capacity alternating current and direct current transmission are developed rapidly, so that opportunities are provided for the application of a novel phase modulator. The large-scale new energy is often positioned at the tail end of an interconnected power grid, the power grid is weak in structure and small in local load, a conventional supporting power supply is lacked nearby, the dynamic elastic supporting capacity of power electronic reactive compensation equipment is lower than 1/2 of a phase modulator with the same capacity, the inertia frequency problem, the power angle and the voltage problem are obvious, and the power transmission capacity and the new energy absorption capacity are limited. In order to solve the voltage stability problem caused by the output of new energy at a direct current transmitting end and the hollowing of a conventional unit at a receiving end load center, a national power grid is provided with a large-capacity phase modulator and a distributed phase modulator in a plurality of direct current transmitting/receiving end converter stations and new energy field stations in a matched mode, the short-circuit capacity and the voltage stability level of the transmitting/receiving end power grid are improved, and the short-circuit capacity and the inertia support level of the new energy field stations are improved. The subsequent distributed phase modulators are expected to become matched standard equipment of the new energy station, and the number of the phase modulators is increased gradually along with the scale construction of the new energy station, so that the new energy station can meet the grid connection requirement specified by the GB38755 power system safety and stability guide rule.
In addition, the new energy stations are usually distributed at the tail end of a power grid in a high-proportion new energy sending system, the new energy stations are far away from the center of the power grid, the electrical connection with the system is weak, and the problem of dynamic stability of active power low-frequency oscillation of the high-proportion new energy sending system through alternating current and direct current still exists; meanwhile, active low-frequency oscillation between the generator group and the regional power grid and between the regional power grids occurs sometimes in the dynamic process after the system is disturbed. Therefore, the large, medium and small phase modulators configured in the system are used for participating in restraining the active power low-frequency oscillation of the system, relevant additional control is researched on the basis of not influencing the voltage and reactive power supporting capability of the phase modulators on a power grid, so that the influence capability of the phase modulators on the dynamic stability of the low-frequency oscillation is exerted, the stabilizing effect of the phase modulators on the power grid and the benefit brought by the investment of the phase modulators can be more fully exerted, the electric power safety and stability level of a weak area of the power grid, particularly the electric power safety and stability level of a new energy source accessed to a terminal area of the power grid is improved, and the high-quality electric energy sending capability is ensured.
However, in the prior art documents, only a method and a system for suppressing the subsynchronous oscillation of a new energy unit based on a phase modulator are found, which mainly aim at the oscillation suppression of a subsynchronous frequency band component, and no relevant data are found in the suppression technology of active low-frequency oscillation within the range of 0.1-3.0 Hz.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the additional control can exert the influence capability of a phase modulator on the dynamic stability of low-frequency oscillation, so that the phase modulators with different capacities, which are put into operation in the prior art and gradually put into operation in the future, can be used for participating in the suppression of the low-frequency oscillation of the system.
The invention adopts the following technical scheme for solving the technical problems:
an additional damping control method for suppressing active low-frequency oscillation comprises the following steps:
the method comprises the steps that the rotating speed of a phase modulator or the negative value of the active power of the phase modulator is taken as a first input signal, the first input signal is subjected to a first measurement link and a first stopping link to obtain a first variable quantity, the first variable quantity is subjected to a first low-pass filtering link, and then is subjected to a first third-order lead-lag correction link and a first upper and lower amplitude limiting link to obtain a first output signal;
taking the voltage frequency of a grid-connected point bus of a power generation unit at the position where a phase modulator is connected as a second input signal, obtaining a second variable quantity through the second input signal by a second measurement link and a second stopping link, and obtaining a second output signal through the second variable quantity by a second low-pass filtering link, a second third-order lead-lag correction link and a second upper and lower amplitude limiting link;
after the first output signal and the second output signal are superposed, the superposed signals are used as the output of the additional damping controller of the phase modulator through a third upper and lower amplitude limiting link, and positive damping effect is generated on the local active oscillation of the phase modulator and the system after the system is disturbed and the line active low-frequency oscillation between the new energy power generation unit and the system.
As a preferred embodiment of the method of the present invention, the specific steps of obtaining the first output signal are as follows:
As a preferred version of the method according to the invention, the first input signal U is 1 Taking the rotor speed omega of the phase modifier or the active power negative value-Pe of the phase modifier.
As a preferable scheme of the method of the present invention, in step 1, when the first blocking element is of two orders, the variation Δ U of the first input signal is 1 The calculation of (a) is shown as the formula (a), and the variation quantity delta U of the first input signal when the first stopping step is a first order 1 Is calculated as shown in equation (b):
wherein, T 5 Is the time constant of the first measurement link; t is w1 Is the first order DC-blocking element time constant, T w2 Is a second step straight ringA time-of-day constant; s represents a differential operator;
change vector signal DeltaU of first input signal in1 Is calculated as shown in equation (c):
wherein, K s1 For varying the vector signal Δ U in1 A gain factor of (d); a is n2 、a n1 、a n0 、a m1 And a m0 Is the coefficient of the first low-pass filtering element.
As a preferred embodiment of the method of the present invention, in the step 2, the signal Δ U is calculated according to the formula (d) * out1 Signal Δ U * out1 Obtaining a first output signal delta U after a first upper and lower amplitude limiting link out1 ：
Wherein, T 11 ～T 16 The time constant of the first third-order lead-lag correction link; the first upper and lower amplitude limit values are K L1 The per unit value is 5-10%.
As a preferred embodiment of the method of the present invention, the specific steps of obtaining the second output signal are as follows:
step 3, obtaining a second input signal U 2 The second measurement link and the second stopping link are sequentially carried out to obtain the variation delta U of the second input signal 2 Then the second low-pass filtering step and gain coefficient K are carried out s2 Obtaining a change vector signal delta U of the second input signal after amplification in2 ；
Step 4, change vector signal delta U of second input signal in2 A second output signal delta U is obtained after a second third-order lead-lag correction link and a second upper and lower amplitude limiting link out2 。
As a preferred variant of the inventive method, the second input signal U is 2 Taking the frequency f of the voltage of the grid-connected point bus of the power generation unit at the phase modulator access position s 。
As a preferable solution of the method of the present invention, in step 3, when the second stopping step is two-step, the variation Δ U of the second input signal is 2 Is calculated as shown in equation (e), the variation Δ U of the second input signal when the second stopping step is a first order 2 Is calculated as shown in equation (f):
wherein, T 6 Is the time constant of the measuring link; t is w3 Is the first order DC-blocking element time constant, T w4 Is a second order stopping link time constant; s represents a differential operator;
change vector signal DeltaU of second input signal in2 Is calculated as shown in equation (g):
wherein, K s2 For varying the vector signal Δ U in2 A gain factor of (d); a is k2 、a k1 、a k0 、a j1 And a j0 Is the coefficient of the second low-pass filtering element.
As a preferred embodiment of the method of the present invention, in the step 4, the signal Δ U is calculated according to the formula (h) * out2 Signal Δ U * out2 A second output signal delta U is obtained after a second upper and lower amplitude limiting link out2 ：
Wherein, T 21 ～T 26 The time constant of the second third-order lead-lag correction link; the second upper and lower amplitude limit values are K L2 The per unit value is 5-10%.
As a preferred scheme of the method, the specific steps for generating the positive damping effect are as follows:
step 5, for the first output signal delta U out1 And a second output signal DeltaU out2 Overlapping to obtain output signal delta U out ；
Step 6, outputting the signal delta U out After passing through a third upper and lower amplitude limiting links, the output signal delta U is used as an output signal delta U of an additional damping controller of a phase modulator pss ；
Step 7, outputting the output signal delta U of the phase modulator additional damping controller pss Given signal U superposed to voltage closed-loop control of phase modulator excitation system ref And a feedback signal U g The offset input point of (a) produces an additional positive damping effect by the phase modulator excitation system.
An additional damping control device for suppressing active low-frequency oscillation comprises a first input signal acquisition module, a first input signal processing module, a second input signal acquisition module, a second input signal processing module and a superposition module, wherein:
the first input signal acquisition module is used for acquiring a first input signal U 1 ；
The first input signal processing module is used for processing a first input signal U 1 Obtaining the variation delta U of the first input signal after sequentially passing through a first measuring link and a first stopping link 1 Then the first low-pass filtering step and gain coefficient K are carried out s1 Obtaining a change vector signal delta U of the first input signal after amplification in1 (ii) a Change vector signal DeltaU of first input signal in1 Obtaining a first output signal delta U after a first third-order lead-lag correction link and a first upper and lower amplitude limiting link out1 ；
The second input signal acquisition module is used for acquiring a second input signal U 2 ；
The second input signal processing module is used for converting the second input signal into the second input signalInput signal U 2 Obtaining the variation delta U of the second input signal after sequentially passing through a second measurement link and a second stopping link 2 Then the second low-pass filtering step and gain coefficient K are carried out s2 Obtaining a change vector signal delta U of the second input signal after amplification in2 (ii) a Change vector signal DeltaU of second input signal in2 A second output signal delta U is obtained after a second third-order lead-lag correction link and a second upper and lower amplitude limiting link out2 ；
The superposition module is used for outputting a first output signal delta U out1 And a second output signal DeltaU out2 After superposition, the signal is used as an output signal delta U of an additional damping controller of a phase modulator after passing through a third upper and lower amplitude limiting links pss (ii) a And positive damping effect is generated on local active oscillation of the phase modulator and the system after the system is disturbed and on line active low-frequency oscillation between the new energy power generation unit and the system.
The control system based on the additional damping control device for inhibiting the active low-frequency oscillation comprises a superposition link and a control link of a phase modulator excitation system, wherein:
the superposition link is used for adding an output signal delta U of the phase modulator to an additional damping controller pss Given signal U superposed to voltage closed-loop control of phase modulator excitation system ref And a feedback signal U g The offset input point of (1);
and the control link of the phase modulator excitation system is used for generating additional positive damping action on local active oscillation of the phase modulator and the system after the system is disturbed and on line active low-frequency oscillation between the new energy power generation unit and the system according to signals generated by the deviation input point.
A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, the processor implementing the steps of the additional damping control method for damping active low frequency oscillations as described above when executing the computer program.
A computer readable storage medium, having stored thereon a computer program which, when being executed by a processor, carries out the steps of the additional damping control method of suppressing active low frequency oscillations as defined above.
Compared with the prior art, the invention adopting the technical scheme has the following technical effects:
1. the invention respectively introduces a phase modulator power (or rotating speed) signal and a bus voltage frequency signal, the signal variation is subjected to low-pass filtering, gain amplification and multi-order lead-lag correction links to obtain a damping control output signal, the signal is superposed to a given and feedback deviation input point of the phase modulator excitation system voltage closed-loop control, and an additional damping effect is generated through the phase modulator excitation system.
2. The active low-frequency oscillation in the dynamic process after the system disturbance and the line low-frequency oscillation between the new energy power generation unit and the system are controlled by the excitation of the phase modulator to provide certain positive damping, so that the dynamic stability of the system is enhanced; the method has the advantages that the stabilizing effect of the phase modulator on the power grid and the benefits brought by the investment of the phase modulator are fully exerted, and the safety and stability level of the power in the weak area of the power grid, particularly the power in the terminal area of the new energy accessed into the power grid is improved.
Drawings
FIG. 1 is a block diagram of a model of the phase modulator additional damping control of the present invention;
FIG. 2 is a schematic diagram of the main wiring of the phase modulator access grid system;
FIG. 3 is a simulation of line transmission power oscillations after system disturbances without additional damping control of the phase modulator, where (a) is the line active power and (b) is the phase modulator output reactive power;
FIG. 4 is a simulation of line transmission power oscillation after system disturbance after the phase modulator is put into additional damping control, wherein (a) is line active power, and (b) is phase modulator output reactive power.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
With the increase of the number of large, medium and small phase modulators configured in a power grid system, the phase modulators are used for inhibiting the active power low-frequency oscillation of the system and exerting the influence capability of the phase modulators on the dynamic stability of the low-frequency oscillation, so that the stabilizing effect of the phase modulators on the power grid and the benefits brought by the investment of the phase modulators can be more fully exerted, and the power safety and stability level of a weak area of the power grid is improved.
Fig. 1 shows a block diagram of an additional damping control model of a phase modulator according to the present invention, which is designed and implemented by the following steps:
1) measuring the rotor speed omega of a phase modulator or the active power Pe of the phase modulator, wherein the active power Pe signal of the phase modulator needs to be inverted; the two are switched by a selection switch to be used as a first input signal U 1 。
First input signal U 1 Obtaining the variation delta U of the first input signal after the first measurement link and the first stopping link 1 Then the first low-pass filtering step and gain coefficient K are carried out s1 Obtaining a change vector signal delta U of the first input signal after amplification in1 。
When the first DC-blocking link is a two-step DC-blocking link, the variation delta U of the first input signal 1 Is calculated as shown in the following formula (a), when the first stopping element is a first stopping element, the variation amount Δ U of the first input signal is calculated 1 Is calculated as shown in the following formula (b):
wherein, T 5 Setting the inertia delay time of the first signal measurement according to the actual time constant of the measurement link; t is a unit of w1 Is the time constant of the first DC blocking element, T w2 Is a second stopping link time constant; s denotes a differential operator.
The measurement time constant represents the time for a valid measurement value obtained by measuring a certain analog quantity to reach 63.2% of a final measurement value, and represents the speed of measurement results obtained by measuring the analog quantity. The measurement time constants of the different analog quantities are different. Examples are: if the time constant of measuring an analog quantity by the measuring system is 15ms, the time from the time when the analog quantity suddenly changes to the time when the measured value reaches 63.2% of the actual final value of the analog quantity is 15 ms. The actual measurement time constant of the analog quantity is set according to a measurement system.
Variation vector signal DeltaU of first input signal in1 Is calculated as shown in the following formula (c):
wherein, K s1 For varying the vector signal Δ U in1 A gain factor of (d); a is n2 、a n1 、a n0 、a m1 And a m0 Is the coefficient of the first low-pass filtering element.
2) Change vector signal DeltaU of first input signal in1 Obtaining a first output signal delta U after a first third-order lead-lag correction link and a first upper and lower amplitude limiting link out1 。
Calculating according to formula (d) to obtain signal delta U * out1 Signal Δ U * out1 Obtaining a first output signal delta U after a first upper and lower amplitude limiting link out1 ：
Wherein, T 11 ～T 16 The time constant of the first third-order lead-lag correction link; the first upper and lower amplitude limit values are K L1 Generally, the per unit value is 5-10%.
3) Fig. 2 is a schematic diagram of the main wiring of the phase modulator to the grid system. The phase modifier access place and the nearby power generation unit are electrically connected with the bus. Measuring frequency f of grid-connected point bus voltage of power generation unit near phase modulator access point s As a second input signal U 2 。
Second input signal U 2 Obtaining the variation delta U of the second input signal after the second measurement link and the second stopping link 2 Then the second low-pass filtering step and gain coefficient K are carried out s2 Obtaining a change vector signal delta U of the second input signal after amplification in2 。
When the second DC-isolating link is a two-step DC-isolating link, the variation delta U of the second input signal 2 Is calculated as shown in the following equation (e), when the second stopping element is a first stopping element, the variation Δ U of the second input signal is calculated 2 Is calculated as shown in the following formula (f):
wherein, T 6 Setting the inertia delay time measured by the second signal according to the actual time constant of the measuring link; t is w3 Is the time constant of the first DC blocking element, T w4 Is a second stopping link time constant; s denotes a differential operator.
Change vector signal DeltaU of second input signal in2 Is calculated as shown in the following formula (g):
wherein, K s2 For varying the vector signal Δ U in2 A gain factor of (d); a is k2 、a k1 、a k0 、a j1 And a j0 Is the coefficient of the second low-pass filtering element.
4) Change vector signal DeltaU of second input signal in2 A second output signal delta U is obtained after a second third-order lead-lag correction link and a second upper and lower amplitude limiting link out2 。
Calculating according to the formula (h) to obtain a signal delta U * out2 Signal Δ U * out2 A second output signal delta U is obtained after a second upper and lower amplitude limiting link out2 ：
Wherein, T 21 ～T 26 The time constant of the second third-order lead-lag correction link; the second upper and lower amplitude limit values are K L2 Generally, the per unit value is 5-10%.
5) The first output signal DeltaU obtained from step 2) out1 And the second output signal DeltaU obtained in step 4) out2 Overlapping to obtain output signal delta U out The calculation is as shown in the following formula (i):
ΔU out ＝ΔU out1 +ΔU out2 (i)
6) output signal delta U obtained in step 5) out After passing through a third upper and lower amplitude limiting links, the output delta U is used as the output delta U of the additional damping controller of the phase modulator pss The third upper and lower amplitude limits are K L Generally, the per-unit value is 10%.
7) Additional damping controller output Δ U obtained from step 6) pss The signals are superposed to the given and feedback deviation input points of the closed-loop control of the phase modulator excitation system voltage, and additional damping action is generated through the phase modulator excitation system.
Fig. 3 (a) and (b) show the power oscillation simulation situation transmitted on the transmission line between the new energy power generation unit and the system after the system is disturbed when the additional damping control of the phase modulator is not put into use, wherein the active oscillation damping ratio is 0.07, the oscillation frequency is more, and the oscillation is settled after a longer time;
fig. 4 (a) and (b) show the power oscillation simulation situation transmitted on the transmission line between the new energy power generation unit and the system after the system is disturbed after the phase modulator is put into additional damping control, at this time, the active oscillation damping ratio is improved to 0.198, the oscillation frequency is obviously reduced, and the oscillation is settled after a short time.
The phase modulator additional damping control implementation method of the invention comprises the following steps: first input signal U 1 The method comprises the steps that a rotating speed omega of a phase modulator or an active power negative value-Pe of the phase modulator is taken, a variable quantity is obtained through a blocking link, measurement noise is reduced through a low-pass filtering link, a lag characteristic of an excitation system of the phase modulator is compensated through a third-order lead lag link, and then torque generated by additional control is enabled to be close to a delta omega axis of the phase modulator, so that an effective positive damping effect is provided for active oscillation of the phase modulator and a local machine of the system after the system is disturbed; second input signal U 2 Taking the frequency f of the voltage of the grid-connected point bus of the power generation unit near the phase modulator access point s The variable quantity is obtained through a stopping link, the measurement noise is reduced through a low-pass filtering link, a non-low-frequency oscillation mode signal is restrained, and a certain phase relation is formed between the torque generated by additional control and the variable quantity of the transmission power of the line after the lag characteristic of the phase modulator is compensated through a three-order lead-lag link, so that an effective positive damping effect is provided for the active low-frequency oscillation of the line between the new energy power generation unit and the system; the first output signal and the second output signal have respective adjustable gain coefficient and amplitude limiting value, so that the action size and weight of the first output signal and the second output signal in the additional damping control can be changed, and the synthesized additional damping control can generate damping action on the oscillation condition.
The invention also provides an additional damping control device for inhibiting active low-frequency oscillation, which comprises a first input signal acquisition module, a first input signal processing module, a second input signal acquisition module, a second input signal processing module and a superposition module, wherein:
the first input signal acquisition module is used for acquiring a first input signal U 1 ；
The first input signal processing module is used for processing a first input signal U 1 Obtaining the variation delta U of the first input signal after sequentially passing through a first measuring link and a first stopping link 1 Then the first low-pass filtering step and gain coefficient K are carried out s1 Obtaining a change vector signal delta U of the first input signal after amplification in1 (ii) a Change vector signal DeltaU of first input signal in1 Through the first three-step lead-lag correctionObtaining a first output signal delta U after a positive link and a first upper and lower amplitude limiting link out1 ；
The second input signal acquisition module is used for acquiring a second input signal U 2 ；
The second input signal processing module is used for processing a second input signal U 2 Obtaining the variation delta U of the second input signal after sequentially passing through a second measurement link and a second stopping link 2 Then the second low-pass filtering step and gain coefficient K are carried out s2 Obtaining a change vector signal delta U of the second input signal after amplification in2 (ii) a Change vector signal DeltaU of second input signal in2 A second output signal delta U is obtained after a second third-order lead-lag correction link and a second upper and lower amplitude limiting link out2 ；
The superposition module is used for outputting the first output signal delta U out1 And a second output signal DeltaU out2 After superposition, the signal is used as an output signal delta U of an additional damping controller of a phase modulator after passing through a third upper and lower amplitude limiting links pss (ii) a And positive damping effect is generated on local active oscillation of the phase modulator and the system after the system is disturbed and on line active low-frequency oscillation between the new energy power generation unit and the system. .
The invention also provides an additional damping control system for inhibiting active low-frequency oscillation, which comprises the control device, a superposition link and a control link of a phase modulator excitation system, wherein the control link comprises the following steps:
the superposition link is used for adding an output signal delta U of the phase modulator to the damping controller pss Given signal U superposed to voltage closed-loop control of phase modulator excitation system ref And a feedback signal U g The offset input point of (1);
and the control link of the phase modulator excitation system is used for generating additional positive damping action on local active oscillation of the phase modulator and the system after the system is disturbed and on line active low-frequency oscillation between the new energy power generation unit and the system according to signals generated by the deviation input point.
All relevant contents of each step related to the embodiment of the aforementioned additional damping control method for suppressing active low-frequency oscillation may be cited to the functional description of the functional module corresponding to the additional damping control device and system for suppressing active low-frequency oscillation in the embodiment of the present application, and are not described herein again.
Based on the same inventive concept, the embodiment of the present application provides a computer device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the aforementioned additional damping control method for suppressing active low-frequency oscillation when executing the computer program.
Based on the same inventive concept, embodiments of the present application provide a computer-readable storage medium, where a computer program is stored, and the computer program, when executed by a processor, implements the aforementioned steps of the additional damping control method for suppressing active low-frequency oscillation.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (14)
1. An additional damping control method for suppressing active low-frequency oscillation is characterized by comprising the following steps:
the method comprises the steps that the rotating speed of a phase modulator or the negative value of the active power of the phase modulator is taken as a first input signal, the first input signal is subjected to a first measurement link and a first stopping link to obtain a first variable quantity, the first variable quantity is subjected to a first low-pass filtering link, and then is subjected to a first third-order lead-lag correction link and a first upper and lower amplitude limiting link to obtain a first output signal;
taking the voltage frequency of a grid-connected point bus of a power generation unit at the position where a phase modulator is connected as a second input signal, obtaining a second variable quantity through the second input signal by a second measurement link and a second stopping link, and obtaining a second output signal through the second variable quantity by a second low-pass filtering link, a second third-order lead-lag correction link and a second upper and lower amplitude limiting link;
after the first output signal and the second output signal are superposed, the superposed signals are used as the output of the additional damping controller of the phase modulator through a third upper and lower amplitude limiting link, and positive damping effect is generated on the local active oscillation of the phase modulator and the system after the system is disturbed and the line active low-frequency oscillation between the new energy power generation unit and the system.
2. The method for additional damping control of active low frequency oscillation suppression according to claim 1, wherein the specific steps of obtaining the first output signal are as follows:
step 1, obtaining a first input signal U 1 Obtaining the variation delta U of the first input signal after sequentially passing through a first measuring link and a first stopping link 1 Then the first low-pass filtering step and gain coefficient K are carried out s1 Obtaining a change vector signal delta U of the first input signal after amplification in1 ；
Step 2, change vector signal delta U of first input signal in1 Obtaining a first output signal delta U after a first third-order lead-lag correction link and a first upper and lower amplitude limiting link out1 。
3. The method for additional damping control of active low frequency oscillations according to claim 2, characterized in that, said first input signal U 1 Taking the rotor speed omega of a phase modulator or the negative value-Pe of the active power of the phase modulator.
4. The active low-frequency oscillation suppressing additional damping control method according to claim 2, wherein in the step 1, the first blocking element is a variation Δ U of the first input signal with two stages 1 The calculation of (a) is shown as the formula (a), and the variation quantity delta U of the first input signal when the first stopping step is a first order 1 Is calculated as shown in equation (b):
wherein, T 5 Is the time constant of the first measurement link; t is a unit of w1 Is the first order DC-blocking element time constant, T w2 Is a second order stopping link time constant; s represents a differential operator;
change vector signal DeltaU of first input signal in1 Is calculated as shown in equation (c):
wherein, K s1 For varying the vector signal Δ U in1 A gain factor of (d); a is n2 、a n1 、a n0 、a m1 And a m0 Is the coefficient of the first low-pass filtering element.
5. The active low frequency oscillation suppressing additional damping control method according to claim 4, wherein in the step 2, the signal Δ U is calculated according to the formula (d) * out1 Signal Δ U * out1 Obtaining a first output signal delta U after a first upper and lower amplitude limiting link out1 ：
Wherein, T 11 ～T 16 The time constant of the first third-order lead-lag correction link; the first upper and lower amplitude limit values are K L1 The per unit value is 5-10%.
6. The method for additional damping control of active low frequency oscillation suppression according to claim 1, wherein the specific steps of obtaining the second output signal are as follows:
step 3, obtaining a second input signal U 2 The second measurement link and the second stopping link are sequentially carried out to obtain the variation delta U of the second input signal 2 Then passes through a second low-pass filtering ringPitch and gain factor K s2 Obtaining a change vector signal delta U of the second input signal after amplification in2 ；
Step 4, change vector signal delta U of second input signal in2 A second output signal delta U is obtained after a second third-order lead-lag correction link and a second upper and lower amplitude limiting link out2 。
7. The active low frequency oscillation suppressing additional damping control method according to claim 6, wherein the second input signal U is 2 Taking the frequency f of the voltage of the grid-connected point bus of the power generation unit at the phase modulator access position s 。
8. The active low-frequency oscillation suppressing additional damping control method according to claim 6, wherein in the step 3, the second stopping link is a variation Δ U of the second input signal in two steps 2 Is calculated as shown in equation (e), the variation Δ U of the second input signal when the second stopping step is a first order 2 Is calculated as shown in equation (f):
wherein, T 6 Is the time constant of the measuring link; t is w3 Is the first order DC-blocking element time constant, T w4 Is a second order stopping link time constant; s represents a differential operator;
change vector signal DeltaU of second input signal in2 Is calculated as shown in equation (g):
wherein, K s2 For varying the vector signal Δ U in2 A gain factor of (d); a is k2 、a k1 、a k0 、a j1 And a j0 Is the coefficient of the second low-pass filtering element.
9. The method for additional damping control of active low frequency oscillation suppression according to claim 8, wherein in the step 4, the signal Δ U is calculated according to the formula (h) * out2 Signal Δ U * out2 A second output signal delta U is obtained after a second upper and lower amplitude limiting link out2 ：
Wherein, T 21 ～T 26 The time constant of the second third-order lead-lag correction link; the second upper and lower amplitude limit values are K L2 The per unit value is 5-10%.
10. The method for additional damping control of active low frequency oscillation suppression according to claim 1, wherein the specific steps of generating positive damping are as follows:
step 5, for the first output signal delta U out1 And a second output signal DeltaU out2 Overlapping to obtain output signal delta U out ；
Step 6, outputting the signal delta U out After passing through a third upper and lower amplitude limiting links, the output signal delta U is used as an output signal delta U of an additional damping controller of a phase modulator pss ；
Step 7, adding the output signal delta U of the damping controller to the phase modulator pss Given signal U superposed to voltage closed-loop control of phase modulator excitation system ref And a feedback signal U g The offset input point of (a) produces an additional positive damping effect by the phase modulator excitation system.
11. An additional damping control device for inhibiting active low-frequency oscillation is characterized by comprising a first input signal acquisition module, a first input signal processing module, a second input signal acquisition module, a second input signal processing module and a superposition module, wherein:
the first input signal acquisition module is used for acquiring a first input signal U 1 ；
The first input signal processing module is used for processing a first input signal U 1 Obtaining the variation delta U of the first input signal after sequentially passing through a first measuring link and a first stopping link 1 Then the first low-pass filtering step and gain coefficient K are carried out s1 Obtaining a change vector signal delta U of the first input signal after amplification in1 (ii) a Change vector signal DeltaU of first input signal in1 Obtaining a first output signal delta U after a first third-order lead-lag correction link and a first upper and lower amplitude limiting link out1 ；
The second input signal acquisition module is used for acquiring a second input signal U 2 ；
The second input signal processing module is used for processing a second input signal U 2 Obtaining the variation delta U of the second input signal after sequentially passing through a second measurement link and a second stopping link 2 Then the second low-pass filtering step and gain coefficient K are carried out s2 Obtaining a change vector signal delta U of the second input signal after amplification in2 (ii) a Change vector signal DeltaU of second input signal in2 A second output signal delta U is obtained after a second third-order lead-lag correction link and a second upper and lower amplitude limiting link out2 ；
The superposition module is used for outputting a first output signal delta U out1 And a second output signal DeltaU out2 After superposition, the signal is used as an output signal delta U of an additional damping controller of a phase modulator after passing through a third upper and lower amplitude limiting links pss (ii) a And positive damping effect is generated on local active oscillation of the phase modulator and the system after the system is disturbed and on line active low-frequency oscillation between the new energy power generation unit and the system.
12. The control system of the additional damping control device for suppressing active low frequency oscillation according to claim 11, wherein the control system comprises a superposition link and a control link of a phase modulator excitation system, wherein:
the superposition link is used for adding an output signal delta U of the phase modulator to an additional damping controller pss Given signal U superposed to voltage closed-loop control of phase modulator excitation system ref And a feedback signal U g The offset input point of (1);
and the control link of the phase modulator excitation system is used for generating additional positive damping action on local active oscillation of the phase modulator and the system after the system is disturbed and on line active low-frequency oscillation between the new energy power generation unit and the system according to signals generated by the deviation input point.
13. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the additional damping control method for damping active low frequency oscillations according to any one of claims 1 to 10 when executing the computer program.
14. A computer-readable storage medium, in which a computer program is stored, which, when being executed by a processor, carries out the steps of the method for additional damping control of active low frequency oscillations according to any one of claims 1 to 10.
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