CN109038615B - Stabilizer for inhibiting power oscillation of flexible direct current transmission system - Google Patents
Stabilizer for inhibiting power oscillation of flexible direct current transmission system 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
- H02J3/24—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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
- H02J2003/365—Reducing harmonics or oscillations in HVDC
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
Abstract
The invention discloses a stabilizer for inhibiting power oscillation of a flexible direct current transmission system, which comprises: the compensation command generator collects the power grid frequency and an active power signal output by the flexible direct current transmission system, forms an active power command value compensation signal, a d-axis current command value compensation signal and a d-axis output voltage compensation signal after calculation and processing, and outputs the three compensation signals to the converter station controller; the converter station controller collects three-phase output current and three-phase terminal voltage signals of the flexible direct current transmission system, and generates driving signals of the converter station by combining the received active power instruction value compensation signals, d-axis current instruction value compensation signals and d-axis output voltage compensation signals through calculation and processing. By the method and the device, the small signal stability of the flexible direct current transmission system can be effectively enhanced.
Description
Technical Field
The invention relates to the field of flexible direct current transmission, in particular to a stabilizer for inhibiting power oscillation of a flexible direct current transmission system.
Background
The flexible direct current transmission system mainly comprises a sending end flexible direct current converter station, a direct current transmission line used for transmitting direct current and a receiving end flexible direct current converter station. The method is widely applied to the field of power transmission, and the active power of the flexible direct current transmission system is stabilized by controlling the flexible direct current converter station. In the method, an active power reference signal and an active power detection signal are subjected to difference, and a d-axis current reference signal is generated after the difference passes through an active power controller. And the d-axis current reference signal and the d-axis current detection signal are subjected to difference, a d-axis output voltage signal is generated after passing through the d-axis current controller, and the flexible direct current converter station outputs corresponding active power according to the d-axis output voltage signal. When active power changes, the errors of the active power reference signal and the active power detection signal also change, the d-axis output voltage signal also changes according to the errors, and the flexible direct current converter station adjusts the output of the active power according to the d-axis output voltage signal, so that the active power is stabilized.
A flexible dc-added subsynchronous oscillation control system for suppressing subsynchronous resonance and oscillation is disclosed in chinese patent CN 103730903A. By adding a subsynchronous damping control strategy to the flexible direct current control system, a plurality of torsional vibration modes can be inhibited, so that the problem of multimode subsynchronous oscillation and resonance of the power system is solved. Chinese patent CN104934992A discloses a subsynchronous oscillation suppression device and method based on phase-locked loop error. The control module obtains a phase-locked loop error signal through signal detection, and then adjusts the size of electric damping through controlling reactive current, so that subsynchronous oscillation is suppressed.
The method for adding subsynchronous damping control to the flexible direct current control system has limitation when the fan is connected to the flexible direct current transmission system. When the fan is connected into the flexible direct-current power transmission system, power oscillation of various frequencies can occur in the system, besides subsynchronous oscillation, low-frequency oscillation and supersynchronous oscillation can also be generated, subsynchronous damping control faces oscillation of other frequencies, the control effect can be worsened, and the purpose of stabilizing active power cannot be achieved. Therefore, there is a need in the related art to seek a more sophisticated control method to solve this practical problem.
Disclosure of Invention
The invention aims to provide a stabilizer for inhibiting power oscillation of a flexible direct current transmission system, which can better inhibit power oscillation generated by interaction between the flexible direct current transmission system and other equipment.
To achieve the above object, according to one aspect of the present invention, there is provided a stabilizer for suppressing power oscillation of a flexible direct current transmission system, including a compensation command generator and a converter station controller; the compensation command generator is used for detecting active power of the flexible direct current transmission system and oscillation signals of alternating current power grid frequency, forming an active power command value compensation signal, a d-axis current command value compensation signal and a d-axis output voltage compensation signal after signal processing, and transmitting the three compensation signals to the converter controller; the converter station controller is used for detecting three-phase output current and three-phase terminal voltage signals of the flexible direct current transmission system, and meanwhile, generating driving signals of the converter station by combining the received active power instruction value compensation signals, d-axis current instruction value compensation signals and d-axis output voltage compensation signals through calculation and processing.
Further preferably, the compensation command generator includes a ratio controller, a filter regulator, and a lead-lag loop controller, wherein:
the method comprises the following steps that a proportional controller collects active power and alternating current power grid frequency signals of a flexible direct current power transmission system, obtains a proportional control signal through calculation and selection, and outputs the proportional control signal to a filtering regulator;
the filter regulator receives the proportional control signal, detects a low-frequency oscillation signal, a subsynchronous oscillation signal and a high-frequency oscillation signal in the proportional control signal, and outputs the three oscillation signals to the lead-lag ring controller;
the lead-lag ring controller is used for receiving the low-frequency oscillation signal, the subsynchronous oscillation signal and the high-frequency oscillation signal and performing lead-lag adjustment on the phases of the low-frequency oscillation signal, the subsynchronous oscillation signal and the high-frequency oscillation signal to obtain a compensation signal.
The compensation command generator has the technical advantages that different power oscillation signals can be identified, the calculation of the amplitude proportion and the phase lead-lag of the signals can be carried out more reasonably and pertinently according to the oscillation frequency section of the power oscillation signals, the compensation signals are obtained, and the output characteristics of the power are adjusted through the compensation signals. The decoupling control of different oscillation frequencies can be realized.
As a further preferred, the proportional controller includes a first proportional device, a second proportional device and a signal selector, wherein the first proportional device collects a grid frequency signal and outputs a grid frequency proportional control signal; the second proportioner collects an active power signal of the flexible direct current transmission system and outputs an active power proportional control signal of the flexible direct current transmission system; the signal selector collects a power grid frequency proportion control signal and an active power proportion control signal of the flexible direct current transmission system, and one of the proportion signals is selected and output through calculation and signal processing.
The proportional controller has the technical advantages that the power grid frequency oscillation signal and the power oscillation signal can be collected at the same time, and the control target signal containing the oscillation information is generated through reasonable proportional control. The accuracy of the oscillation signal acquisition can be improved.
As a further preferred, the frequency band of the low-frequency oscillation signal is between 0.1Hz and 2Hz, the frequency band of the subsynchronous oscillation signal is between 2Hz and 50Hz, and the frequency band of the supersynchronous oscillation signal is between 50Hz and 500 Hz.
As a further preference, the converter station controller comprises an active power controller, a d-axis current controller, a reactive power controller, a q-axis current controller, a phase-locked controller, a coordinate converter and a driving signal generator. The active power controller receives an active power reference signal, an active power detection signal and an active power instruction value compensation signal, obtains a d-axis current reference signal through calculation and processing, and outputs the d-axis current reference signal to the d-axis current controller; the phase-locked controller receives the three-phase terminal voltage signal, obtains a power grid voltage phase signal through calculation and processing, and transmits the power grid voltage phase signal to the coordinate converter; and the coordinate converter receives the power grid voltage phase signals and the three-phase current signals and obtains d-axis current signals and q-axis current signals through coordinate conversion. The d-axis current controller receives a d-axis current reference signal, a d-axis current instruction value compensation signal and a d-axis output voltage compensation signal, and obtains a d-axis output voltage signal through calculation and processing; the q-axis current controller receives a q-axis current reference signal and a q-axis current signal, and a q-axis output voltage signal is obtained through calculation and processing; the driving signal generator receives the d-axis output voltage signal, the q-axis output voltage signal and the power grid voltage phase signal, obtains a driving signal through calculation and processing, and transmits the driving signal to the converter of the flexible direct current converter station.
The converter station controller has the technical advantages that compensation command signals and output three-phase current voltage signals are collected, rapid and accurate calculation is carried out, control signals are sent to the converter station, the power output of the converter station is adjusted, and the purpose of suppressing power oscillation is achieved. The rapidity and accuracy of control can be improved.
As a further preference, the active power controller includes an adder, a subtractor, a PI controller, and a limiter. The adder receives the active power instruction value compensation signal and the active power reference signal, adds the two to obtain an active power correction reference signal, and transmits the operation result to the subtractor; the subtractor receives the active power correction reference signal and the active power signal, performs subtraction operation on the active power correction reference signal and the active power signal to obtain an active power error value, and transmits a calculation result to the PI controller; and the PI controller receives the active power error value, obtains an initial d-axis current reference signal through calculation and processing, sends the initial d-axis current reference signal to the amplitude limiter for amplitude limiting, and finally obtains the d-axis current reference signal.
The active power controller has the technical advantages that the active power command value compensation signal and the active power signal are collected, calculation and processing are carried out on a slow time scale, and d-axis current is controlled, so that output power is controlled to inhibit low-frequency oscillation. The rapidity and the accuracy of suppressing the low-frequency oscillation power can be improved.
Further preferably, the d-axis current controller includes an adder, a subtractor, and a PI controller. The adder receives the d-axis current reference signal and the d-axis current instruction value compensation signal, performs addition operation on the d-axis current reference signal and the d-axis current instruction value compensation signal to obtain a d-axis current correction reference signal, and transmits an operation result to the subtractor; the subtractor receives the d-axis current correction reference signal and the d-axis current signal, performs subtraction operation on the d-axis current correction reference signal and the d-axis current signal to obtain a d-axis current error value, and transmits a calculation result to the PI controller; the PI controller receives the d-axis current error value, obtains an initial d-axis output voltage signal through calculation and processing, and sends the initial d-axis output voltage signal to the adder; the adder receives the initial d-axis output voltage signal and the d-axis output voltage compensation signal, and adds the initial d-axis output voltage signal and the d-axis output voltage compensation signal to obtain a corrected d-axis output voltage signal.
The d-axis current controller has the technical advantages that a d-axis current instruction value compensation signal, a d-axis output voltage compensation signal, a d-axis current reference signal and a d-axis current signal are collected, calculation and processing are carried out on a relatively fast time scale, the d-axis output voltage signal is controlled, and therefore output power is controlled to inhibit subsynchronous oscillation and high-frequency oscillation. The rapidity and the accuracy of suppressing subsynchronous and high-frequency oscillation power can be improved.
According to the invention, the flexible direct current transmission system has good stability, and the power oscillation stabilizer can design a corresponding proportioner and a lead-lag regulator respectively aiming at the frequency characteristics of low-frequency oscillation, subsynchronous oscillation and supersynchronous oscillation, so as to more accurately regulate the power output of different frequency sections and achieve the purpose of inhibiting the oscillation of different frequency sections. The method is beneficial to protecting electronic components such as switching devices, inductors, capacitors and the like, prolonging the service life and improving the stability of the flexible direct current transmission system.
Drawings
Fig. 1 is a schematic structural diagram of a stabilizer for suppressing power oscillation of a flexible direct current transmission system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a compensation command generator in a stabilizer for suppressing power oscillation of a flexible direct current transmission system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a schematic structure of a proportional controller in a compensation command generator according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a lead-lag ring controller in a compensated command generator according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a converter station controller in a stabilizer for suppressing power oscillation of a flexible direct current transmission system according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an active power controller in a converter station controller according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a d-axis current controller in a converter station controller according to an embodiment of the present invention.
Detailed Description
The present invention is a control method and system for suppressing active power oscillation of a flexible direct current transmission system, and the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Fig. 1 is a schematic diagram of the overall principle of a power oscillation stabilizer according to the present invention. As shown in fig. 1, an application object of the power oscillation stabilizer according to the present invention is, for example, a flexible dc power transmission system, which includes, as well known in the art: a transmitting end alternating current network 11, a transmitting end line equivalent impedance 12, a transmitting end flexible direct current converter station filter regulator 13 for filtering input alternating current, a transmitting end flexible direct current converter station 21 for rectifying alternating current into direct current, a direct current transmission line 22 for transmitting direct current, a receiving end flexible direct current converter station 23 for inverting direct current into alternating current, a receiving end flexible direct current converter station filter regulator 24 for filtering output alternating current, a receiving end line equivalent impedance 25, a receiving end alternating current network 26, and the like.
The compensation command generator 3 is used for collecting the frequency signal f of the AC power gridgAnd active power signal P of flexible direct current transmission systemhvdcAnd obtaining an active power instruction value compensation signal P through calculation and processing based on the acquired signalcomD-axis current command value compensation signal idcomAnd d-axis output voltage compensation signal uccomAnd transmits the three-way compensation signal to the converter station controller 4.
The converter station controller 4 is used for collecting three-phase current signals i of the flexible direct current transmission systema、ib、icAnd a three-phase terminal voltage signal uta、utb、utcAnd obtains the driving signal 40 through calculation and processing based on the acquired signal, and then performs control of the receiving end flexible direct current converter station 23.
Through the above conception, compared with the active power controller of the flexible direct current transmission system in the prior art, the active power controller of the flexible direct current transmission system only calculates the grid side d-axis current command signal i according to the active power error valuedrefCompared with the prior art, the invention introduces the power grid frequency fgAnd active power PhvdcExtracting oscillation signals with different frequencies, and forming an active power command value compensation signal P after calculation and processingcomD-axis current command value compensation signal idcomAnd d-axis output voltage compensation signal uccomAnd combining the threeThe path compensation signal is output to a converter station controller 4; converter station controller for collecting three-phase current signals i of flexible direct current transmission systema、ib、icAnd a three-phase terminal voltage signal uta、utb、utcWhile combining the received active power command value compensation signal PcomD-axis current command value compensation signal idcomAnd d-axis output voltage compensation signal uccomThe drive signal 40 of the commutation flex station 23 is generated by calculation and processing, controlling the commutation flex station 23. By the control method, the oscillation signals of different frequencies of the active power of the flexible direct current transmission system can be detected and used as the reference factor in the active power control process, so that the active power oscillation of the flexible direct current transmission system is well inhibited, and the small-interference stability is improved.
As further preferred, as shown in fig. 2, the compensation command generator 3 includes a ratio controller 31, a filter regulator 32, and a lead-lag loop controller 33. The ratio controller 31 collects the active power signal P of the flexible direct current transmission systemhvdcAnd AC mains frequency signal fgAnd a proportional control signal 32 is obtained by calculation and selection and then output to a filter regulator 33; the filter regulator 33 receives the proportional control signal 32, detects the low-frequency oscillating signal 341, the sub-synchronous oscillating signal 342, and the high-frequency oscillating signal 343, and outputs these three oscillating signals to the lead-lag ring controller 35; the lead-lag ring controller 35 is configured to receive the low-frequency oscillating signal 341, the sub-synchronous oscillating signal 342, and the high-frequency oscillating signal 343, and perform a lead-lag adjustment of the phases thereof to obtain an active power command value compensation signal 36, a d-axis current command value compensation signal 37, and a d-axis output voltage compensation signal 38.
As a further preference, the frequency segment of the low-frequency oscillating signal 341 is between 0.1Hz and 2Hz, the frequency segment of the sub-synchronous oscillating signal 342 is between 2Hz and 50Hz, and the frequency segment of the super-synchronous oscillating signal 343 is between 50Hz and 500 Hz.
Further preferably, as shown in fig. 3, the proportional controller 31 includes a first proportioner 311 and a second proportioner312 and a signal selector 315, wherein the first comparator collects a grid frequency signal fgAnd outputs a grid frequency proportional control signal 313; the second proportioner collects the active power signal P of the flexible direct current transmission systemhvdcAnd outputs a flexible direct current transmission system active power proportion control signal 314; the signal selector 315 collects the grid frequency proportion control signal 313 and the active power proportion control signal 314 of the flexible direct current transmission system, and selects and outputs one of the proportion signals 32 through calculation and signal processing.
As further preferred, as shown in fig. 4, the lead-lag ring controller 33 includes a first phase adjuster 351, a second phase adjuster 352, and a third phase adjuster 353. The first phase adjuster 351 receives the low-frequency oscillation signal 341, obtains the active power command value compensation signal 36 through the lead-lag phase adjustment and calculation processing, the second phase adjuster 352 receives the subsynchronous oscillation signal 342, obtains the d-axis current command value compensation signal 37 through the lead-lag phase adjustment and calculation processing, receives the supersynchronous oscillation signal 343, and obtains the d-axis output voltage compensation signal 38 through the lead-lag phase adjustment and calculation processing.
As further preferred, the converter station controller 4 comprises an active power controller 41, a d-axis current controller 43, a reactive power controller 48, a q-axis current controller 482, a phase lock controller 45, a coordinate converter 47 and a drive signal generator 49, as shown in fig. 5. Wherein the active power controller 41 receives an active power reference signal PrefActive power detection signal PhvdcAnd the active power instruction value compensation signal 36, obtain the d-axis current reference signal 42 through calculation and processing, and output the d-axis current reference signal 42 to the d-axis current controller 43; the phase-locked controller 45 receives a three-phase terminal voltage signal uta、utb、utcA power grid voltage phase signal 46 is obtained through calculation and processing and is transmitted to a coordinate converter 47; the coordinate converter 47 receives the grid voltage phase signal 46 and the three-phase current signal ia、ib、icThe d-axis current signal 471 and the q-axis current signal 472 are obtained by coordinate transformation. The d-axis current controller 43 receives the d-axisThe current reference signal 42, the d-axis current signal 471, the d-axis current instruction value compensation signal 37 and the d-axis output voltage compensation signal 38 are calculated and processed to obtain a d-axis output voltage signal 44; the q-axis current controller 482 receives the q-axis current reference signal 481 and the q-axis current signal 472, and calculates and processes the q-axis current reference signal 481 and the q-axis current signal 472 to obtain a q-axis output voltage signal 483; the drive signal generator 49 receives the d-axis output voltage signal 44, the q-axis output voltage signal 483, and the grid voltage phase signal 46, computes and processes the drive signal 40, and transmits the drive signal 40 to the soft dc converter station converter 23.
As further preferred, as shown in fig. 6, the active power controller 41 includes an adder 411, a subtractor 413, a PI controller 415, and a limiter 417. Wherein the adder 411 receives the active power command value compensation signal 36 and the active power reference signal PrefAdding the two signals to obtain an active power correction reference signal 412, and transmitting the operation result to the subtractor 413; the subtractor 413 receives the active power modification reference signal 412 and the active power signal PhvdcSubtracting the two values to obtain an active power error value 414, and transmitting the calculation result to the PI controller 415; the PI controller 415 receives the active power error value 414, obtains an initial d-axis current reference signal 416 through calculation and processing, and sends the initial d-axis current reference signal 416 to the limiter 417 for limiting, and finally obtains the d-axis current reference signal 42. Preferably, the limiter 417 has a maximum limiter value of 1.2 times the d-axis current rating and a minimum limiter value of-1.2 times the d-axis current rating.
Further preferably, as shown in fig. 7, the d-axis current controller 43 includes a first adder 431, a subtractor 433, a PI controller 435, and a second adder 437. The first adder 431 receives the d-axis current reference signal 42 and the d-axis current command value compensation signal 37, adds the two signals to obtain a d-axis current correction reference signal 432, and transmits the operation result to the subtractor 433; the subtractor 433 receives the d-axis current correction reference signal 432 and the d-axis current signal 471, performs subtraction operation on the two signals to obtain a d-axis current error value 434, and transmits a calculation result to the PI controller 435; the PI controller 435 receives the d-axis current error value 434, obtains an initial d-axis output voltage signal 436 through calculation and processing, and sends the initial d-axis output voltage signal to the second adder 437; the second summer 437 receives the initial d-axis output voltage signal 436 and the d-axis output voltage compensation signal 38 and adds them to produce the corrected d-axis output voltage signal 44.
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 (5)
1. A stabilizer for suppressing power oscillations of a flexible direct current transmission system, comprising: a compensation command generator and a converter station controller;
the compensation command generator is used for detecting active power of the flexible direct current transmission system and oscillation signals of alternating current power grid frequency, forming an active power command value compensation signal, a d-axis current command value compensation signal and a d-axis output voltage compensation signal after signal processing, and transmitting the three compensation signals to the converter controller;
the converter station controller is used for detecting three-phase output current and three-phase terminal voltage signals of the flexible direct current transmission system, and obtaining a driving signal for controlling the converter station by combining the received active power instruction value compensation signal, the d-axis current instruction value compensation signal and the d-axis output voltage compensation signal;
the compensation command generator includes: a proportional controller, a filter regulator and a lead-lag loop controller;
the proportion controller is used for acquiring active power and alternating current power grid frequency signals of the flexible direct current power transmission system and obtaining proportion control signals according to the active power and the alternating current power grid frequency signals;
the filter regulator is used for receiving the proportional control signal and detecting a low-frequency oscillation signal, a subsynchronous oscillation signal and a high-frequency oscillation signal in the proportional control signal;
the lead-lag ring controller is used for receiving the low-frequency oscillation signal, the subsynchronous oscillation signal and the high-frequency oscillation signal, performing lead-lag adjustment on the phases of the low-frequency oscillation signal, the subsynchronous oscillation signal and the high-frequency oscillation signal, and obtaining a compensation signal for correcting reference values of active power, current and voltage.
2. The stabilizer of claim 1, wherein the proportional controller includes a first proportional, a second proportional, and a signal selector;
the first proportioner is used for collecting a power grid frequency signal and outputting a power grid frequency proportion control signal according to the power grid frequency signal;
the second proportioner is used for acquiring an active power signal of the flexible direct current transmission system and outputting an active power proportion control signal of the flexible direct current transmission system according to the active power signal;
the signal selector is used for collecting a power grid frequency proportion control signal and an active power proportion control signal of the flexible direct current transmission system, and selecting one of the proportion signals with obvious oscillation frequency according to the power grid frequency proportion control signal and the active power proportion control signal.
3. A stabilizer according to any of claims 1-2, characterized in that the converter station controller comprises: the device comprises an active power controller, a d-axis current controller, a reactive power controller, a q-axis current controller, a phase-locked controller, a coordinate converter and a driving signal generator;
the active power controller is used for receiving an active power reference signal, an active power detection signal and an active power instruction value compensation signal and obtaining a d-axis current reference signal;
the phase-locking controller is used for receiving a three-phase terminal voltage signal and acquiring a power grid voltage phase signal;
the coordinate converter is used for receiving a power grid voltage phase signal and a three-phase current signal and obtaining a d-axis current signal and a q-axis current signal through coordinate conversion;
the d-axis current controller is used for receiving a d-axis current reference signal, a d-axis current instruction value compensation signal and a d-axis output voltage compensation signal and obtaining a d-axis output voltage signal;
the q-axis current controller is used for receiving a q-axis current reference signal and a q-axis current signal and obtaining a q-axis output voltage signal;
the driving signal generator is used for receiving the d-axis output voltage signal, the q-axis output voltage signal and the power grid voltage phase signal and obtaining a driving signal for controlling the converter station.
4. The stabilizer of claim 3, wherein the active power controller comprises: the device comprises an adder, a subtracter, a PI controller and an amplitude limiter;
the adder is used for receiving the active power instruction value compensation signal and the active power reference signal and performing addition operation on the two signals to obtain an active power correction reference signal;
the subtractor is used for receiving the active power correction reference signal and the active power signal and carrying out subtraction operation on the active power correction reference signal and the active power signal to obtain an active power error value;
the PI controller is used for receiving the active power error value and obtaining an initial d-axis current reference signal according to the active power error value;
the limiter is used for receiving the initial d-axis current reference signal and carrying out limiting processing on the initial d-axis current reference signal to obtain a d-axis current reference signal.
5. The stabilizer of claim 3, wherein the d-axis current controller comprises: an adder, a subtractor and a PI controller;
the adder is used for receiving the d-axis current reference signal and the d-axis current instruction value compensation signal and performing addition operation on the d-axis current reference signal and the d-axis current instruction value compensation signal to obtain a d-axis current correction reference signal;
the subtracter is used for receiving the d-axis current correction reference signal and the d-axis current signal and carrying out subtraction operation on the d-axis current correction reference signal and the d-axis current signal to obtain a d-axis current error value;
the PI controller is used for receiving the d-axis current error value and obtaining an initial d-axis output voltage signal according to the d-axis current error value;
the adder is used for receiving the initial d-axis output voltage signal and the d-axis output voltage compensation signal and adding the initial d-axis output voltage signal and the d-axis output voltage compensation signal to obtain a corrected d-axis output voltage signal.
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| CN112600211B (en) * | 2020-11-24 | 2023-08-22 | 全球能源互联网研究院有限公司 | Voltage compensation device and method for end-to-end direct current transmission system |
| CN113162070B (en) * | 2021-04-22 | 2022-06-17 | 浙江大学 | High-frequency oscillation suppression method for flexible direct current transmission system |
| CN113036783A (en) * | 2021-05-08 | 2021-06-25 | 国网经济技术研究院有限公司 | Flexible-direct high-frequency oscillation control method and system |
| CN113036784A (en) * | 2021-05-08 | 2021-06-25 | 国网经济技术研究院有限公司 | Flexible-direct high-frequency oscillation control method and system based on hysteresis link |
| CN113629751B (en) * | 2021-08-10 | 2024-04-23 | 国网经济技术研究院有限公司 | Phase-locked loop phase compensation method and system for high-frequency oscillation control of flexible direct system |
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