CN114142474A - Damping control method and system for improving transient stability of new energy equipment - Google Patents

Damping control method and system for improving transient stability of new energy equipment Download PDF

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CN114142474A
CN114142474A CN202111490795.5A CN202111490795A CN114142474A CN 114142474 A CN114142474 A CN 114142474A CN 202111490795 A CN202111490795 A CN 202111490795A CN 114142474 A CN114142474 A CN 114142474A
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damping
signal
damping control
link
additional
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CN114142474B (en
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马锐
江克证
占萌
曹侃
黎金鑫
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Huazhong University of Science and Technology
Electric Power Research Institute of State Grid Hubei Electric Power Co Ltd
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Electric Power Research Institute of State Grid Hubei Electric Power Co Ltd
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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
    • H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
    • 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
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • 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
    • H02J3/40—Synchronising a generator for connection to a network or to another generator
    • H02J3/44—Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/22—The renewable source being solar energy
    • H02J2300/24—The renewable source being solar energy of photovoltaic origin
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy
    • 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
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Control Of Eletrric Generators (AREA)

Abstract

The invention discloses a damping control method and a damping control system for improving the transient stability of new energy equipment, which belong to the field of transient stability control of new energy power systems and comprise the following steps: the first part is a fault detection link and mainly provides a switching signal of an additional link. Judging whether to put into an additional control link on the basis of the original phase-locked loop control by detecting whether the amplitude of the terminal voltage is lower than a set value or not; the second part is a damping mode selection link, and different damping control modes and adaptive damping compensation coefficients are selected according to external input signals; and the third part is an additional damping control link, and the generated additional damping signal is compensated to the frequency output or the voltage output of the phase-locked loop according to an external control signal. The method and the device can improve the synchronous tracking operation capability of the new energy equipment under the condition of serious failure, are easy to modify the existing equipment and have low implementation cost.

Description

Damping control method and system for improving transient stability of new energy equipment
Technical Field
The invention belongs to the field of transient stability control of new energy power systems, and particularly relates to a damping control method and system for improving transient stability of new energy equipment.
Background
A novel power system taking new energy as a main body is built into a power system taking renewable energy sources such as wind power and photovoltaic as main primary energy sources. In recent years, wind power generation in China is continuously and rapidly increased, the percentage of the wind power generation in a power grid is increasingly higher, and the wind power generation becomes three main energy sources in China. On the power transmission side, because primary energy and load in China are reversely distributed, in order to adapt to the energy distribution structure in China and meet the urgent requirements on aspects such as clean energy delivery, load center power supply, energy conservation, emission reduction and the like, national power grid companies vigorously develop extra-high voltage alternating current and direct current technologies suitable for long-distance and large-capacity power transmission. It is expected that high-proportion new energy access and alternating current-direct current hybrid connection will be one of the main characteristics of future electric power systems in China. The characteristics of high dependence on power electronic devices, high controllability, high action speed and the like of new energy power generation, extra-high voltage direct current transmission and the like bring a new transient stability problem to a power system, and the regulation and protection pressure of a power grid dispatching department is increased. In recent years, transient stability accidents related to new energy power generation, direct current transmission and the like occur for many times in domestic and foreign power systems, and the safe and stable operation of the power systems is seriously threatened.
According to the synchronous mode of the power electronic equipment, the power electronic equipment can be divided into two types of equipment, namely a phase-locked type equipment and a networking type equipment, the transient response characteristics of the two types of equipment are greatly different, and the phase-locked type equipment is widely applied. However, the existing analysis method is not fully aware of the transient stability problem, and especially, the influence of multiple coupling mechanisms such as multi-scale controller coupling, electromechanical and electromagnetic coupling and the like on the grid-connected transient stability of the phase-locked equipment needs to be further deepened. Therefore, the current research is also dispersed for the transient stability improvement strategy after various phase-locked devices such as new energy power generation and direct current transmission are connected to the power grid. Some control strategies are realized by changing the output power reference value of the new energy equipment after the fault occurs, and others are realized by changing the proportional and integral coefficients of the original phase-locked loop controller. In recent years, some strategies improve transient stability by adding control branches such as feedforward and feedback. However, the existing control strategies greatly change the existing phase-locked control structure, greatly affect the original characteristics of the device, easily cause new stability problems and reduce the design performance index of the phase-locked loop. Therefore, a control strategy that has a small change to the original control structure, has a weak influence on the performance index of the device, and can improve the transient stability of the system is needed.
Disclosure of Invention
Aiming at the defects and improvement requirements of the prior art, the invention provides a damping control method and a damping control system for improving the transient stability of new energy equipment, and aims to improve the synchronous tracking operation capability of the new energy equipment under the condition of serious faults, easily realize the synchronous tracking operation capability on the existing equipment and reduce the transformation cost.
In order to achieve the above purpose, the present invention comprises three parts in total, which are respectively:
the first part is a fault detection link and mainly provides a switching signal of an additional link. And judging whether to put into an additional control link or not by detecting whether the amplitude of the terminal voltage is lower than a set value or not. If the output signal of the detection link is 1 if the output signal is lower than the set value, an additional control link is put into the detection link on the basis of the control of the original phase-locked loop; if the output signal of the detection link is 0 if the output signal is larger than the set value, the additional link is not enabled, the original phase-locked controller is used independently, and the control logic can be described by the following mathematical expression.
Figure BDA0003399269070000021
The second part is a damping mode selection link, and different damping control modes and adaptive damping compensation coefficients are selected mainly according to external input signals. The selection of the damping mode can be set in advance and then operated in a grid-connected mode, and can also be changed in real time in the operation process of the device. When the damping control mode signal is 1, the damping mode is selected as a proportional link, namely the product of an output constant and an input angle; when the damping control mode signal is 2, the damping mode is selected as a cosine link, that is, the cosine signal value of the input angle is output, and the control logic is as follows:
Figure BDA0003399269070000031
meanwhile, the damping compensation coefficient in the damping mode selection link can be designed according to the requirements of performance indexes such as the rising time, the peak time and the adjusting time of the phase-locked loop response in a self-adaptive manner according to system parameters. According to different design performance requirements, the compensation parameter ζ and the system parameter including the line measurement inductance L can be usedgIs equipped with a current reference value idrefAnd terminal voltage measurement value UgAnd calculating a damping compensation coefficient meeting the design requirement, wherein the calculation method can be represented by the following mathematical formula:
Figure BDA0003399269070000032
and the third part is an additional damping control link which compensates the additional damping signal generated by the damping mode selection link to different signal positions of the original phase-locked loop according to an external control signal. The compensation position signal can be set in advance, and the position compensated by the additional damping control signal can be replaced according to the requirement in the operation process. When the compensation position signal is 1, the additional damping control signal compensates the q-axis voltage; when the compensated position signal is 2, the additional damping control signal will compensate for the frequency error, and its mathematical logic can be expressed by the following mathematical formula:
Figure BDA0003399269070000033
wherein u istq0Is a q-axis voltage signal, utqFor compensated q-axis electricityPressure signal, omega10As a frequency error signal, omega1F (delta) is a damping compensation signal for the compensated frequency error signal.
In another aspect, the present invention provides a damping control system for improving transient stability of new energy equipment, including:
a fault detection link for judging whether to switch the additional control part or not by detecting whether the amplitude of the voltage at the grid-connected end of the new energy equipment is lower than a set value, if so, switching an additional damping control link on the basis of the original phase-locked loop control, otherwise, disabling the additional damping control link;
a damping mode selection link for correspondingly generating linear and nonlinear damping compensation signals according to the damping control mode signal;
and the additional damping control link is used for adding the generated damping compensation signal to the position of different signals of the original phase-locked loop by setting the on-off signal in the additional damping control link.
Generally, by the above technical solution conceived by the present invention, the following beneficial effects can be obtained:
(1) the damping control method for improving the transient stability of the new energy equipment only performs additional compensation on the phase-locked control link, does not change other control structures, has small change on the original system control structure, has weak influence on other control performance indexes of the equipment, is easy to reform the existing equipment, and has low implementation cost.
(2) Through theoretical calculation, the additional control link provided by the invention does not change the control structure of the system in normal operation, does not change the parameters of the original phase-locked controller, and only provides proper damping when the system fails, so that the transient synchronous operation capability of the system can be practically improved.
Drawings
FIG. 1 is a block diagram of an additional control element provided in the practice of the present invention;
FIG. 2 is a flow chart of an additional damping control link input provided by the implementation of the present invention;
FIG. 3 is a time domain diagram of the phase-locked loop angle error after the additional control element provided by the present invention is added;
fig. 4 is a time domain diagram of the frequency error of the phase-locked loop after the additional control element provided by the implementation of the present invention is added.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the scope of the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
In the present application, the terms "first," "second," and the like (if any) in the description and the drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In order to improve the synchronous tracking operation capability of new energy equipment under the condition of serious fault and facilitate the upgrading and reconstruction of the existing equipment, the invention provides a damping control strategy for improving the transient stability of the new energy equipment, which only adds an additional control link to an original phase-locked controller when the fault occurs, and other control links such as a voltage control link, a power control link and a current control link, including the following control links, are not changed, wherein the specific control structure is shown in figure 1 and comprises the following steps: the device comprises an original phase-locked controller part and an additional control link. Wherein, the additional control link includes: a fault detection link, a damping mode selection link, an additional damping control link and the like.
The first part is a fault detection link and mainly provides a switching signal of an additional link. And judging whether to put into an additional control link or not by detecting whether the amplitude of the terminal voltage is lower than a set value or not. If the output signal of the detection link is 1 if the output signal is lower than the set value, an additional control link is put into the detection link on the basis of the control of the original phase-locked loop; if the output signal of the detection link is 0 if the output signal is larger than the set value, the additional link is not enabled, the original phase-locked controller is used independently, and the control logic can be described by the following mathematical expression.
Figure BDA0003399269070000051
The second part is a damping mode selection link, and different damping control modes and adaptive damping compensation coefficients are selected mainly according to external input signals. The selection of the damping mode can be set in advance and then operated in a grid-connected mode, and can also be changed in real time in the operation process of the device. When the damping control mode signal is 1, the damping mode is selected as a proportional link, namely the product of an output constant and an input angle; when the damping control mode signal is 2, the damping mode is selected as a cosine link, that is, the cosine signal value of the input angle is output, and the control logic is as follows:
Figure BDA0003399269070000052
meanwhile, the damping compensation coefficient in the damping mode selection link can be designed according to the requirements of performance indexes such as the rising time, the peak time and the adjusting time of the phase-locked loop response in a self-adaptive manner according to system parameters. According to different design performance requirements, the compensation parameter ζ and the system parameter including the line measurement inductance L can be usedgIs equipped with a current reference value idrefAnd terminal voltage measurement value UgAnd calculating a damping compensation coefficient meeting the design requirement, wherein the calculation method can be represented by the following mathematical formula:
Figure BDA0003399269070000061
and the third part is an additional damping control link which compensates the additional damping signal generated by the damping mode selection link to different signal positions of the original phase-locked loop according to an external control signal. The compensation position signal can be set in advance, and the position compensated by the additional damping control signal can be replaced according to the requirement in the operation process. When the compensation position signal is 1, the additional damping control signal compensates the q-axis voltage; when the compensated position signal is 2, the additional damping control signal will compensate for the frequency error, and its mathematical logic can be expressed by the following mathematical formula:
Figure BDA0003399269070000062
wherein u istq0Is a q-axis voltage signal, utqFor compensated q-axis voltage signals, omega10As a frequency error signal, omega1F (delta) is a damping compensation signal for the compensated frequency error signal.
The detection flow of the fault detection link is shown in fig. 2. The detection link firstly judges whether the terminal voltage value is smaller than a set value according to a set rule, if so, the output signal is 1, and the process returns to the beginning of continuous judgment. If not, continuously judging whether the output frequency error of the phase-locked loop is 0, if so, setting the output signal to be 0, and ending the process. If not, returning to the beginning to continue judging.
As shown in fig. 1, when the output signal of the fault detection link is 1, the additional control link is enabled, and the additional control link is put into use to participate in the original phase-locked controller. The damping mode selection link can select and output different damping signal forms according to the control mode signal. When the damping control mode signal is 1, the damping mode selection link outputs a linear damping signal, and the value of the linear damping signal is the product of the input signal and a preset damping compensation coefficient, namely the product of the phase-locked loop angle and a constant. When the damping control mode signal is 2, the damping mode selects a nonlinear output mode, and the output value of the nonlinear output mode is the product of the value of the input signal subjected to cosine operation and a preset damping compensation coefficient, namely the output value is the product of the cosine signal value of the phase-locked loop angle and a constant.
Wherein, the damping compensation coefficient k in the damping mode selection link1And k2The method can be self-adaptive according to different system design performance index requirements. By using different compensation parameters zeta and system parameters Lg、idref、UgCalculating a corresponding damping compensation systemNumber, i.e. k1，k2So as to obtain the final additional damping control signal to enter the next link.
An additional damping control link is shown in fig. 1, which uses the on and off of two switches to control the flow direction of the damping compensation signal. After the damping mode selection link determines the damping signal, the additional damping control link controls the damping signal to compensate to the position where the original phase-locked loop controls different signals. When the control signal of the additional damping control link is 1, the additional damping control link compensates the q-axis voltage; when the control signal of the additional damping control link is 2, the additional damping control link compensates the frequency error signal of the phase-locked loop.
Infinite bus voltage sag faults may be employed here to test the effectiveness of the control strategy presented in this patent. When the bus voltage drops from 1.0p.u. to 0.43p.u., the effectiveness of the present patent is verified by comparing the output angle of the phase-locked loop with the frequency time domain signal with or without the control strategy proposed by the present patent. The time domain simulation results are shown in fig. 3 and 4. It can be seen that after the new energy equipment adopting the original phase-locked loop control strategy suffers from a voltage drop to 0.43p.u., the angle and the frequency of the phase-locked loop are as shown by dotted lines in fig. 3 and 4, the angle and the frequency of the phase-locked loop are out of control, and the system is unstable. By adopting the transient stability control strategy provided by the patent, nonlinear and linear damping compensation is respectively carried out on the phase-locked loop, as shown by solid lines and dotted lines in fig. 3 and 4, the voltage drop resistance of the new energy equipment can be obviously improved, the frequency and the angle of the phase-locked loop are stabilized to a new balance point after disturbance, and the instability phenomenon does not occur in the system.
In conclusion, the damping control strategy for improving the transient stability of the new energy equipment provided by the invention can improve the synchronous tracking operation capability of the new energy equipment when the power grid has a serious fault, is easy to realize on the existing equipment, and has low modification cost on the existing equipment.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (9)

1. A damping control method for improving transient stability of new energy equipment is characterized by comprising the following steps:
(1) whether an additional control part is switched or not is judged by detecting whether the amplitude of the voltage at the grid-connected end of the new energy equipment is lower than a set value or not, if so, an additional damping control link is put into the control of the original phase-locked loop, otherwise, the additional damping control link is not enabled;
(2) generating linear and nonlinear damping compensation signals according to the damping control mode signals;
(3) in the additional damping control link, the generated damping compensation signal is added at the position of different signals of the original phase-locked loop by setting the on and off signals.
2. The damping control method according to claim 1, wherein when the voltage of the grid-connected machine of the new energy equipment is lower than a set value, the output signal is 1; when the voltage of the grid-connected machine end of the new energy equipment is greater than a set value, the output signal is 0 and is represented as:
Figure FDA0003399269060000011
wherein Flag is the output signal, UtEquipping grid-connected machine terminal voltage, U for new energythIs a set value.
3. The damping control method according to claim 2, wherein the additional damping control link is switched in when a fault is detected, and the additional damping control link is not switched in normal operation, that is, the operation environment and parameters of the original phase-locked loop are not changed.
4. The damping control method according to claim 1, wherein the form of the damping compensation signal is changed according to the damping control mode signal, and the specific mathematical operation is as follows:
Figure FDA0003399269060000012
wherein F (delta) is a damping compensation signal, F is a damping control mode signal, and when the damping control mode signal is 1, the damping mode is selected as a proportional link, namely the output is a constant k1Product with input angle δ; when the damping control mode signal is 2, the damping mode is selected as a cosine operation link, i.e. the output is constant k2The product of the cosine of the input angle delta.
5. The damping control method according to claim 4, characterized in that the constant k1And constant k2Comprises the following steps:
Figure FDA0003399269060000021
wherein L isgMeasuring inductance for the line idrefFor equipping with current reference values, UgAs a terminal voltage measurement value, ki,pllIs an integral coefficient, k, of a phase-locked loop controllerp,pllProportionality coefficient, xi, of a phase-locked loop controller1Is a linear compensation coefficient, xi2Is a nonlinear compensation coefficient.
6. The damping control method according to claim 4, characterized in that the damping control mode signal is set in advance or changed in operation, namely the damping mode is selected to be either set and then operated in a grid-connected mode or changed in real time during the operation of the device.
7. The damping control method according to claim 1, wherein the position of the damping compensation signal is controlled according to the position compensation signal, and the specific mathematical operation is as follows:
Figure FDA0003399269060000022
wherein u istq0Is a q-axis voltage signal, utqFor compensated q-axis voltage signals, omega10As a frequency error signal, omega1F (delta) is a damping compensation signal for the compensated frequency error signal, and the damping compensation signal is added to the q-axis voltage signal when the position compensation signal M is 1; when the position compensation signal M is 2, the damping compensation signal is added to the frequency error signal.
8. The damping control method according to claim 7, wherein the damping signal compensation position can be set in advance, and the position to which the additional damping control signal is added can be changed in real time as required during operation.
9. The utility model provides an improve new forms of energy and equip damping control system of transient stability which characterized in that includes:
a fault detection link for judging whether to switch the additional control part or not by detecting whether the amplitude of the voltage at the grid-connected end of the new energy equipment is lower than a set value, if so, switching an additional damping control link on the basis of the original phase-locked loop control, otherwise, disabling the additional damping control link;
a damping mode selection link for correspondingly generating linear and nonlinear damping compensation signals according to the damping control mode signal;
and the additional damping control link is used for adding the generated damping compensation signal to the position of different signals of the original phase-locked loop by setting the on-off signal in the additional damping control link.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116231720A (en) * 2023-03-28 2023-06-06 山东大学 Method and system for improving transient stability of new energy through flexible direct current grid-connected system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111146809A (en) * 2020-01-19 2020-05-12 重庆大学 Grid-connected inverter transient stability control method based on improved phase-locked loop

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111146809A (en) * 2020-01-19 2020-05-12 重庆大学 Grid-connected inverter transient stability control method based on improved phase-locked loop

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116231720A (en) * 2023-03-28 2023-06-06 山东大学 Method and system for improving transient stability of new energy through flexible direct current grid-connected system
CN116231720B (en) * 2023-03-28 2023-10-27 山东大学 Method and system for improving transient stability of new energy through flexible direct current grid-connected system

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