CN106410820B - Additional secondary/supersynchronous oscillation control method of broadband and control system - Google Patents
Additional secondary/supersynchronous oscillation control method of broadband and control 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
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Abstract
The invention discloses a kind of additional secondary/supersynchronous oscillation control method of broadband and control system, method includes: to acquire the total three-phase current i in blower sidecOr the three-phase current i that line side is totalL；Filter out subsynchronous and supersynchronous harmonic component；Phase delay is compensated, and/or carries out at least one of phase offset and amplitude compensation；Convert current signal to the reference current I of static reactive generatorSVG；According to reference current ISVGThe additional control signals for being sent to static reactive generator are calculated with the received reference value of static reactive generator；Additional control signals are adjusted.The present invention has the advantage that acquiring the total current in blower side or line side in real time, calculate additional control signals, by controlling static reactive generator, at secondary/supersynchronous frequency that resonance occurs, static reactive generator is equivalent to be connected in parallel on the emotional resistance at bus, the condition that system resonance occurs is destroyed, to effectively inhibit secondary/supersynchronous resonance of system when wind power plant access.
Description
Technical Field
The invention relates to the technical field of power system control, in particular to a broadband additional subsynchronous/supersynchronous oscillation control method and a control system.
Background
Wind energy is a clean and sustainable energy which is widely distributed, and wind power generation in China is continuously and rapidly developed. Considering the reverse distribution of resources and load centers in China, large-scale wind power long-distance delivery becomes a necessary trend. When the wind power plant sends power out through a power transmission line with a series compensation capacitor, secondary/super-synchronous resonance or oscillation which mainly takes an induction generator effect may occur, and the safe and stable operation of a power system is influenced.
Disclosure of Invention
The present invention is directed to solving at least one of the above problems.
Therefore, the first purpose of the invention is to provide a broadband additional subsynchronous/supersynchronous oscillation control method.
A second object of the present invention is to provide a wide-band additional subsynchronous/supersynchronous oscillation control system.
In order to achieve the above object, an embodiment of the present invention discloses a broadband additional subsynchronous/supersynchronous oscillation control method, which includes the following steps: s1: collecting the total three-phase current i of the fan sidecOr total three-phase current i on the line sideL(ii) a S2: to the total three-phase current i of the fan sidecOr the total three-phase current i on the line sideLFiltering to filter out subsynchronous and supersynchronous harmonic components; s3: compensating for phase delays generated by the measurement, filter and the static var generator, and/or performing at least one of a predetermined phase offset and amplitude compensation; s4: converting the compensated or offset current signal into the reference current I of the static var generatorSVGThe method specifically comprises the following steps: when the collected signal is the fan side current icWhen the temperature of the water is higher than the set temperature,when the collected signal is a line side current iLWhen the temperature of the water is higher than the set temperature,wherein, IL,abc(s) and Ic,abc(s) respectively representing the three-phase currents of the line side and the fan sides a, b and c after the signal processing; i isSVG,abc(s) representing the additional reference current of the static var generator; rL、LLRespectively representing the equivalent resistance and inductance, R, of the line sideSVG、LSVGRespectively representing the settable additional equivalent resistance and inductance of the static var generator; s5: according to a reference current ISVGAnd calculating an additional control signal sent to the static var generator according to the reference value received by the static var generator; s6: and adjusting the additional control signal to make the control signal within a preset range.
According to the broadband additional subsynchronous/supersynchronous oscillation control method provided by the embodiment of the invention, the total current of the side of a fan or the side of a line is collected in real time, an additional control signal is calculated, and the static var generator is controlled to be equivalent to inductive impedance connected in parallel with a bus at the subsynchronous/supersynchronous frequency position where resonance occurs, so that the condition of system resonance occurrence is damaged, and subsynchronous/supersynchronous resonance of a system when a wind power plant is accessed is effectively inhibited.
In addition, the broadband additional subsynchronous/supersynchronous oscillation control method according to the above embodiment of the present invention may further have the following additional technical features:
further, step S2 further includes: filtering out the total current i of the fan side by using a band elimination filtercOr the line side total current iLThe fundamental component of (a); and/or filtering out the subsynchronous and supersynchronous harmonic components using a band-pass filter.
Further, step S5 further includes: when the reference value received by the static var generator is a current,wherein,an additional current reference signal for the static var generator; when the reference value received by the static var generator is the access bus voltage,wherein,an additional voltage reference signal for the static var generator; when the reference value received by the static var generator is reactive power, delta q*＝ISVG,abc·VabcWherein, Δ q*Additional instantaneous reactive power reference value, V, for static var generatorabcAnd the fundamental components of the three-phase voltage of the access bus of the static var compensator are shown.
In order to achieve the above object, an embodiment of the present invention discloses a broadband additional sub/super-synchronous oscillation control system, including: a signal acquisition and conversion module for acquiring the total three-phase current i of the fan sidecOr total three-phase current i on the line sideLAnd converted into corresponding digital signals; a filter module for filtering the total three-phase current i of the fan sidecOr the total three-phase current i on the line sideLFiltering to filter out subsynchronous and supersynchronous harmonic components; the proportional phase shifting module is used for compensating the phase delay generated by the measurement, the filter and the static var generator and/or performing at least one of preset phase offset and corresponding amplitude compensation; a reference current calculation module for converting the compensated or offset current signal into a reference current I of the static var generatorSVG(ii) a An additional control signal calculation module for calculating the reference current I of the static var generatorSVGAnd calculating an additional control signal sent to the static var generator according to the reference value received by the static var generator; and the control signal amplitude limiting module is used for adjusting the additional control signal so as to enable the control signal to be in a preset range.
According to the broadband additional subsynchronous/supersynchronous oscillation control system provided by the embodiment of the invention, the total current of the side of a fan or the side of a line is collected in real time, an additional control signal is calculated, and the static var generator is controlled to be equivalent to inductive impedance connected in parallel with a bus at the subsynchronous/supersynchronous frequency position where resonance occurs, so that the condition of system resonance occurrence is damaged, and subsynchronous/supersynchronous resonance of the system when a wind power plant is accessed is effectively inhibited.
In addition, the broadband additional subsynchronous/supersynchronous oscillation control system according to the above embodiment of the present invention may further have the following additional technical features:
further, the filtering module includes: a band elimination filter for filtering out the total current i of the fan sidecOr the line side total current iLThe fundamental component of (a); and/or a band pass filter filtering out the subsynchronous and supersynchronous harmonic components.
Further, the additional control signal calculation is further to: when the static var generator is connectedWhen the reference value is current, wherein the reference value is attached to the static var generatorAdding a current reference signal; when the reference value received by the static var generator is the access bus voltage,wherein the additional voltage reference signal is a static var generatorNumber; when the reference value received by the static var generator is reactive power, delta q*＝ISVG,abc·VabcWherein, Δ q*Is composed ofAdditional instantaneous reactive power reference value, V, of a static var generatorabcThree-phase power for representing access bus of static var compensatorThe fundamental component of compression.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a flow chart of a method for controlling wide frequency band additive sub/super-synchronous oscillation according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the operation principle of the wide-band additional subsynchronous/supersynchronous oscillation control method according to an embodiment of the invention;
fig. 3 is a schematic structural diagram of a broadband additional sub/super-synchronous oscillation control system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. 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.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
These and other aspects of embodiments of the invention will be apparent with reference to the following description and attached drawings. In the description and drawings, particular embodiments of the invention have been disclosed in detail as being indicative of some of the ways in which the principles of the embodiments of the invention may be practiced, but it is understood that the scope of the embodiments of the invention is not limited correspondingly. On the contrary, the embodiments of the invention include all changes, modifications and equivalents coming within the spirit and terms of the claims appended hereto.
The inventor of the application discovers through a great deal of creative work that when the equivalent inductive reactance in the whole system is properly matched with the capacitive reactance parameter (meeting the resonance condition) after the wind turbine is connected to the grid, resonance can occur, and an effective method often adopted for eliminating the resonance is to change the system operation mode to change the system parameter and destroy the resonance condition. Therefore, one of the most basic solutions to the problem of sub/super synchronous resonance caused by the access of the wind power plant is to destroy the condition of system resonance. By adopting certain additional measures, such as a Static Var Generator (SVG) and adopting proper control, the formation of a disadvantageous resonant circuit is avoided, and the subsynchronous/supersynchronous resonance problem of the system can be effectively suppressed.
The broadband additive sub/super-synchronous oscillation control method according to the embodiment of the invention is described below with reference to the accompanying drawings.
Fig. 1 is a flowchart of a broadband additional subsynchronous/supersynchronous oscillation control method according to an embodiment of the present invention, and fig. 2 is a schematic diagram of an operation principle of the broadband additional subsynchronous/supersynchronous oscillation control method according to an embodiment of the present invention. Referring to fig. 1 and 2, a method for controlling wide-band additional sub/super-synchronous oscillation includes the following steps:
s1: collecting the total three-phase current i of the fan sidecOr line side total of threePhase current iL。
In particular, the total three-phase current i at the side of the fan is collectedcOr total three-phase current i on the line sideL. The signals can be collected according to a fixed-interval sampling method, and analog-to-digital conversion is carried out on the collected analog signals to obtain corresponding digital quantities. Methods that can achieve signal acquisition and analog-to-digital conversion are applicable to the present invention. When the number of the side branches of the fan or the side branches of the power grid is multiple, the current of each line can be collected respectively, and the total current is obtained in a summing mode; and the side with few branches can be preferentially selected for signal acquisition according to the number of the branches in the actual system.
S2: total three-phase current i to fan sidecOr total three-phase current i on the line sideLAnd filtering to filter out subsynchronous and supersynchronous harmonic components so as to eliminate the influence of the power frequency signal on the additional subsynchronous/supersynchronous oscillation control method and obtain the contained harmonic current. In one example of the present invention, the subsynchronous and supersynchronous harmonics are 5-45 Hz and 55-95 Hz, respectively.
Specifically, the embodiment of the present invention performs the signal filtering processing step secondly. The step aims to filter fundamental wave signals from the collected original three-phase current signals, filter concerned subsynchronous/supersynchronous harmonic components and reduce the influence of noise, and can be realized by adopting one of the following processing methods:
1) a band elimination filter for filtering fundamental wave component (China corresponds to 50 Hz);
2) the band-pass filter aims to filter sub/super synchronous frequency signals, and the frequency ranges of the band-pass filter are 5-45 Hz and 55-95 Hz in China, and the implementation forms of the band-pass filter are various.
3) Combinations of 1) and 2) above.
S3: compensating for phase delays generated by the measurement, filter and static var generator, and/or at least one of performing a predetermined phase offset and performing amplitude compensation on the filtered signal.
In particular, the phase delay generated by the measurement, filter and static var generator is compensated and/or the necessary phase offset is set according to the control needs. According to the system characteristics, the proportion/phase shift link can be realized by adopting one of the following methods:
1) a phase shifter, which is used to perform appropriate phase compensation on the filtered current signal or set the necessary phase shift according to the control requirement, and has various realization methods, such as a high-pass/low-pass filtering phase shifter;
2) a proportional link, which aims to perform proper amplitude compensation on the filtered signal;
3) a series combination of 1) and 2) above.
A typical transfer function implementation is as follows:
wherein k represents a scaling factor; t represents a time constant; n represents the order of the numerator and denominator of the transfer function and is a positive integer.
S4: converting the compensated or offset current signal into the reference current I of the static var generatorSVGThe method specifically comprises the following steps:
when the collected signal is the fan side current icWhen the temperature of the water is higher than the set temperature,
when the collected signal is a line side current iLWhen the temperature of the water is higher than the set temperature,
wherein, IL,abc(s) and Ic,abc(s) respectively representing the three-phase currents of the line side and the fan sides a, b and c after the signal processing; i isSVG,abc(s) representing the obtained additional reference current of the SVG; rL、LLRespectively representing the equivalent resistance and inductance, R, of the line sideSVG、LSVGRespectively, the additional equivalent resistance and inductance of the settable static var generator.
S5: according to a reference current ISVGAnd the reference value received by the static var generator calculates an additional control signal sent to the static var generator.
In particular, the main role of the additional control signal calculation is to derive the additional current reference value I from the previous calculationSVGAdditional control signals are calculated which can be sent directly to the static var generator. Corresponding to different reference values received by the static var generator, the procedure is divided into the following three cases:
1) when the reference value received by the static var generator is current, the calculation formula of the link is as follows:
whereinAn additional current reference signal for the static var generator.
2) When the reference value received by the static var generator is the voltage of the access bus, the calculation formula of the link is as follows:
whereinIs an additional voltage reference signal for the static var generator.
3) When the reference value received by the static var generator is reactive power, and the inductive reactive power is absorbed as a positive direction, the calculation formula of the link is as follows:
Δq*＝ISVG,abc·Vabc
wherein, Δ q*Additional instantaneous reactive power reference value, V, for static var generatorabcAnd the fundamental components of the three-phase voltage of the access bus of the static var compensator are shown.
S6: the additional control signal is adjusted so that the control signal is within a preset range.
In particular, a larger additional control signal may damage the controller of the static var generator, and therefore, a control signal limiting link is required, which mainly aims to limit the amplitude of the output control signal within a certain range, and when the input control signal exceeds or falls below a certain reference value, the output control signal will be limited to a certain constant value and will not change with the input signal.
The link can adopt a simple digital bidirectional amplitude limiter, and a typical calculation formula is as follows:
wherein, XinThe additional control signal which represents the input of the amplitude limiting link corresponds to different reference values received by the static var generator; xoutAn additional control signal which represents the actual action on the static var generator and is output by the amplitude limiting link; xmax、XminRespectively, the maximum and minimum additional control signal values that are acceptable for the static var compensator or other constraints.
It should be noted that the above signal processing is performed in the abc three-phase coordinate, or the signal may be subjected to forward Park transformation to obtain a dq coordinate system quantity, and then the calculation is performed correspondingly to obtain a control quantity in the dq coordinate system, and if the control interface of the static var generator is defined in the dq coordinate system, the control quantity may be directly output to the control interface; and if the control interface of the static var generator is defined under the abc coordinate system, obtaining the control signal under the abc coordinate system through reverse Park transformation.
The broadband additional subsynchronous/supersynchronous oscillation control method provided by the embodiment of the invention has a simple principle, and can automatically adjust the control signal of the static var generator according to the system characteristics to achieve the purpose of inhibiting subsynchronous/supersynchronous oscillation; the whole link comprises signal acquisition and conversion, filtering, amplitude limiting and the like, can be realized by a simple circuit, has a simple structure, is easy to realize in engineering, can adopt a modular structure, is flexible and convenient to install and debug and is easy to expand; the signal processing of the subsynchronous oscillation/supersynchronous oscillation adopts a single broadband mode, has few parameters, is easy to design and adjust on site, and is suitable for the condition that a single mode or a plurality of modes of a system oscillation mode can adopt a consistent gain and a phase-shifting link.
The following describes a broadband additive sub/super-synchronous oscillation control system according to an embodiment of the present invention with reference to the drawings.
Fig. 3 is a schematic structural diagram of a broadband additional sub/super-synchronous oscillation control system according to an embodiment of the present invention. Referring to fig. 3, a broadband additive sub/super-synchronous oscillation control system includes: a signal acquisition and conversion module 210, a filtering module 220, a proportional phase shift module 230, a reference current calculation module 240, an additional control signal calculation module 250, and a control signal clipping module 260.
The signal collecting and converting module 210 is used for collecting the total three-phase current i of the wind turbinecOr total three-phase current i on the line sideLConverted into a corresponding digital signal.
In particular, a toolIn the body, the total three-phase current i of the wind turbine side is collectedcOr total three-phase current i on the line sideL. The signals can be collected according to a fixed-interval sampling method, and analog-to-digital conversion is carried out on the collected analog signals to obtain corresponding digital quantities. Methods that can achieve signal acquisition and analog-to-digital conversion are applicable to the present invention. When the number of the side branches of the fan or the side branches of the power grid is multiple, the current of each line can be collected respectively, and the total current is obtained in a summing mode; and the side with few branches can be preferentially selected for signal acquisition according to the number of the branches in the actual system.
The filtering module 220 is used for filtering the total three-phase current i of the fan sidecOr total three-phase current i on the line sideLAnd filtering to filter out subsynchronous and supersynchronous harmonic components.
In one example of the present invention, the sub-synchronous and super-synchronous harmonic frequencies are 5-45 Hz and 55-95 Hz, respectively.
Specifically, the embodiment of the present invention performs the signal filtering processing step secondly. The step aims to filter fundamental wave signals from the collected original three-phase current signals, filter concerned subsynchronous/supersynchronous harmonic components and reduce the influence of noise, and can be realized by adopting one of the following processing methods:
1) a band elimination filter for filtering fundamental wave component (China corresponds to 50 Hz);
2) the band-pass filter aims to filter sub/super synchronous frequency signals, and the frequency ranges of the band-pass filter are 5-45 Hz and 55-95 Hz in China, and the implementation forms of the band-pass filter are various.
3) Combinations of 1) and 2) above.
The proportional phase shift module 230 is configured to compensate for phase delays generated by the measurement, filter and static var generator, and/or at least one of perform a predetermined phase offset and perform a corresponding amplitude compensation on the filtered current signal.
In particular, the phase delay generated by the measurement, filter and static var generator is compensated and/or the necessary phase offset is set according to the control needs. According to the system characteristics, the proportional phase-shifting link can be realized by adopting one of the following methods:
1) a phase shifter, which is used to perform appropriate phase compensation on the filtered current signal or set the necessary phase shift according to the control requirement, and has various implementation methods, such as a high-pass/low-pass filtering phase shifter;
2) a proportional link, which aims to perform proper amplitude compensation on the filtered signal;
3) a series combination of 1) and 2) above.
A typical transfer function implementation is as follows:
wherein k represents a scaling factor; t represents a time constant; n represents the order of the numerator and denominator of the transfer function and is a positive integer.
The reference current calculation module 240 is used for converting the compensated or shifted current signal into a reference current I of the static var generatorSVG。
Specifically, when the collected signal is the fan side current icWhen the temperature of the water is higher than the set temperature,
when the collected signal is a line side current iLWhen the temperature of the water is higher than the set temperature,
wherein, IL,abc(s) and Ic,abc(s) respectively representing the three-phase currents of the line side and the fan sides a, b and c after the signal processing; i isSVG,abc(s) representing the obtained additional reference current of the SVG; rL、LLRespectively representing the equivalent resistance and inductance, R, of the line sideSVG、LSVGRespectively, the additional equivalent resistance and inductance of the settable static var generator.
The additional control signal calculation module 250 is used for calculating the reference current I according to the static var generatorSVGAnd the reference value received by the static var generator calculates an additional control signal sent to the static var generator.
Specifically, the main function of the additional control signal calculation is to calculate an additional control signal that can be directly sent to the static var generator according to the additional current reference value calculated in the previous step. Corresponding to different reference values received by the static var generator, the procedure is divided into the following three cases:
1) when the reference value received by the static var generator is current, the calculation formula of the link is as follows:
whereinAn additional current reference signal for the static var generator.
2) When the reference value received by the static var generator is the voltage of the access bus, the calculation formula of the link is as follows:
whereinIs an additional voltage reference signal for the static var generator.
3) When the reference value received by the static var generator is reactive power, and the inductive reactive power is absorbed as a positive direction, the calculation formula of the link is as follows:
Δq*＝ISVG,abc·Vabc
wherein, Δ q*Additional instantaneous reactive power reference value, V, for static var generatorabcAnd the fundamental components of the three-phase voltage of the access bus of the static var compensator are shown.
The control signal limiting module 260 is configured to adjust the additional control signal so that the control signal is within a preset range.
In particular, a larger additional control signal may damage the controller of the static var generator, and therefore, a control signal limiting link is required, which mainly aims to limit the amplitude of the output control signal within a certain range, and when the input control signal exceeds or falls below a certain reference value, the output control signal will be limited to a certain constant value and will not change with the input signal.
The link can adopt a simple digital bidirectional amplitude limiter, and a typical calculation formula is as follows:
wherein, XinThe additional control signal which represents the input of the amplitude limiting link corresponds to different reference values received by the static var generator; xoutAn additional control signal which represents the actual action on the static var generator and is output by the amplitude limiting link; xmax、XminRespectively, the maximum and minimum additional control signal values that are acceptable for the SVG due to its quiescent or other constraints.
It should be noted that the above signal processing is performed in the abc three-phase coordinate, or the signal may be subjected to forward Park transformation to obtain a dq coordinate system quantity, and then the calculation is performed correspondingly to obtain a control quantity in the dq coordinate system, and if the control interface of the static var generator is defined in the dq coordinate system, the control quantity may be directly output to the control interface; and if the control interface of the static var generator is defined under the abc coordinate system, obtaining the control signal under the abc coordinate system through reverse Park transformation.
The broadband additional subsynchronous/supersynchronous oscillation control method provided by the embodiment of the invention has a simple principle, and can automatically adjust the control signal of the static var generator according to the system characteristics to achieve the purpose of inhibiting subsynchronous/supersynchronous oscillation; the whole link comprises signal acquisition and conversion, filtering, amplitude limiting and the like, can be realized by a simple circuit, has a simple structure, is easy to realize in engineering, can adopt a modular structure, is flexible and convenient to install and debug and is easy to expand; the signal processing of the subsynchronous oscillation/supersynchronous oscillation adopts a single broadband mode, has few parameters, is easy to design and adjust on site, and is suitable for the condition that a single mode or a plurality of modes of a system oscillation mode can adopt a consistent gain and a phase-shifting link.
In addition, other configurations and functions of the broadband additional subsynchronous/supersynchronous oscillation control method and control system according to the embodiments of the present invention are known to those skilled in the art, and are not described in detail for reducing redundancy.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (5)
1. A broadband additional subsynchronous/supersynchronous oscillation control method is characterized by comprising the following steps of:
s1: collecting the total three-phase current i of the fan sidecOr total three-phase current i on the line sideL；
S2: to the total three-phase current i of the fan sidecOr the total three-phase current i on the line sideLFiltering to filter out subsynchronous and supersynchronous harmonic components;
s3: compensating for phase delays generated by the measurement, filter and static var generator, and/or performing at least one of a predetermined phase offset and amplitude compensation;
s4: converting the compensated or offset current signal into the reference current I of the static var generatorSVGThe method specifically comprises the following steps:
when the collected signal is the fan side current icWhen the temperature of the water is higher than the set temperature,
when the collected signal is a line side current iLWhen the temperature of the water is higher than the set temperature,
wherein, IL,abc(s) and Ic,abc(s) respectively representing the three-phase currents of the line side and the fan sides a, b and c after the signal processing; i isSVG,abc(s) representing the obtained additional reference current of the SVG; rL、LLRespectively representing the equivalent resistance and inductance, R, of the line sideSVG、LSVGRespectively representing the settable additional equivalent resistance and inductance of the static var generator;
s5: according to the reference current I of the static var generatorSVGAnd calculating an additional control signal sent to the static var generator according to the reference value received by the static var generator;
s6: and adjusting the additional control signal to make the additional control signal within a preset range.
2. The broadband additive sub/super-synchronous oscillation control method according to claim 1, wherein step S2 further includes:
filtering out the total current i of the fan side by using a band elimination filtercOr the line side total current iLThe fundamental component of (a); and/or
A band pass filter is used to filter out the subsynchronous and supersynchronous harmonic components.
3. The broadband additive sub/super-synchronous oscillation control method according to claim 1, wherein step S5 further includes:
when the reference value received by the static var generator is a current,
wherein,an additional current reference signal for the static var generator;
when the reference value received by the static var generator is the access bus voltage,
wherein,an additional voltage reference signal for the static var generator;
when the reference value received by the static var generator is reactive power,
Δq*＝ISVG,abc·Vabc
wherein, Δ q*Additional instantaneous reactive power reference value, V, for static var generatorabcAnd the fundamental components of the three-phase voltage of the access bus of the static var compensator are shown.
4. A broadband additive sub/super-synchronous oscillation control system comprising:
a signal acquisition and conversion module for acquiring the total three-phase current i of the fan sidecOr total three-phase current i on the line sideLAnd is converted into phaseA corresponding digital signal;
a filter module for filtering the total three-phase current i of the fan sidecOr the total three-phase current i on the line sideLFiltering to filter out subsynchronous and supersynchronous harmonic components;
the proportional phase shifting module is used for compensating the phase delay generated by the measurement, the filter and the static var generator and/or performing at least one of preset phase offset and amplitude compensation;
a reference current calculation module for converting the compensated or offset current signal into a reference current I of the static var generatorSVG；
An additional control signal calculation module for calculating the reference current I of the static var generatorSVGAnd calculating an additional control signal sent to the static var generator from the reference value received by the static var generator, wherein the additional control signal calculation is further for:
when the reference value received by the static var generator is a current,
wherein,additional current reference signal for static var generator, ISVG,abc(s) representing the obtained additional reference current of the SVG;
when the reference value received by the static var generator is the access bus voltage,
wherein,additional voltage reference signal for static var generator, RL、LLRespectively representing the equivalent resistance and inductance of the line side;
when the reference value received by the static var generator is reactive power,
Δq*＝ISVG,abc·Vabc
wherein, Δ q*Additional instantaneous reactive power reference value, V, for static var generatorabcRepresenting the fundamental component of three-phase voltage of a bus accessed by the static var compensator; and
and the control signal amplitude limiting module is used for adjusting the additional control signal so as to enable the additional control signal to be in a preset range.
5. The broadband additive sub/super-synchronous oscillation control system of claim 4 wherein the filtering module comprises:
a band elimination filter for filtering out the total current i of the fan sidecOr the line side total current iLThe fundamental component of (a); and/or
And the band-pass filter filters out the subsynchronous harmonic component and the supersynchronous harmonic component.
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