CN106410820B - Broadband additional sub/super synchronous oscillation control method and control system - Google Patents

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 side_cOr the three-phase current i that line side is total_L；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 generator_SVG；According to reference current I_SVGThe 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

Broadband additional sub/super synchronous oscillation control method and control system

technical field

The invention relates to the technical field of power system control, in particular to a broadband additional sub/super-synchronous oscillation control method and control system.

Background technique

Wind energy is a widely distributed clean and sustainable energy, and my country's wind power generation is developing rapidly. Considering the reverse distribution of resources and load centers in my country, large-scale wind power transmission over long distances has become an inevitable trend. When the wind farm sends power through the transmission line with series compensation capacitor, sub/supersynchronous resonance or oscillation may occur mainly due to the induction generator effect, which affects the safe and stable operation of the power system.

SUMMARY OF THE INVENTION

The present invention aims to solve at least one of the above-mentioned technical problems.

Therefore, the first object of the present invention is to propose a broadband additional sub/super synchronous oscillation control method.

The second object of the present invention is to propose a broadband additional sub/super synchronous oscillation control system.

In order to achieve the above purpose, an embodiment of the present invention discloses a broadband additional sub/super synchronous oscillation control method, comprising the following steps: S1: Collect the total three-phase current i _c on the fan side or the total three-phase current i on the line side _L ; S2: filter the total three-phase current i _c on the fan side or the total three-phase current i _L on the line side to filter out sub-synchronization and super-synchronization harmonic components; S3: measure, filter and Compensate the phase delay generated by the static var generator, and/or perform at least one of a predetermined phase offset and amplitude compensation; S4: Convert the compensated or offset current signal into static var The reference current I _SVG of the generator specifically includes: when the collected signal is the fan side current _ic , When the collected signal is the line side current i _L , Among them, I _L,abc (s) and I _c,abc (s) represent the line side and fan side a,b,c three-phase currents after the aforementioned signal processing respectively; _ISVG,abc (s) represents the calculated The additional reference current of the static var generator; R _L , L _L represent the equivalent resistance and inductance on the line side, respectively, R _SVG , L _SVG represent the settable additional equivalent resistance of the static var generator and Inductance; S5: Calculate the additional control signal sent to the static var generator according to the reference current I _SVG and the reference value received by the static var generator; S6: Adjust the additional control signal so that all The control signal is within a preset range.

According to the broadband additional sub/super synchronous oscillation control method of the embodiment of the present invention, the total current on the fan side or the line side is collected in real time, and the additional control signal is calculated. At the frequency, the static var generator is equivalent to an inductive impedance connected in parallel at the busbar, which destroys the conditions for the occurrence of system resonance, thereby effectively suppressing the sub/supersynchronous resonance of the system when the wind farm is connected.

In addition, the broadband additional sub/super-synchronous oscillation control method according to the above-mentioned embodiment of the present invention may also have the following additional technical features:

Further, step S2 further includes: using a band-stop filter to filter out the fundamental component of the total current i _c on the fan side or the total current i _L on the line side; and/or using a band-pass filter to filter out the secondary Synchronous and hypersynchronous harmonic components.

Further, step S5 further includes: when the reference value received by the static var generator is current, in, is the additional current reference signal of the static var generator; when the reference value received by the static var generator is the access bus voltage, in, is the additional voltage reference signal of the static var generator; when the reference value received by the static var generator is reactive power, Δq ^* =I _SVG,abc ·V _abc , where Δq ^* is the static reactive power generation The additional instantaneous reactive power reference value of the compensator, V _abc represents the three-phase voltage fundamental component of the static var compensator connected to the bus.

In order to achieve the above purpose, the embodiment of the present invention discloses a broadband additional sub/super synchronous oscillation control system, including: a signal acquisition and conversion module for collecting the total three-phase current _ic on the fan side or the total line side current ic The three-phase current i _L is converted into a corresponding digital signal; the filtering module is used to filter the total three-phase current i _c on the fan side or the total three-phase current i _L on the line side to filter out the sub-synchronization and super-synchronous harmonic components; proportional phase-shifting module for compensating phase delays generated by measurements, filters and static var generators, and/or performing predetermined phase shifts and performing corresponding amplitude compensation. At least one; a reference current calculation module for converting the compensated or offset current signal into a reference current I _SVG of a static var generator; an additional control signal calculation module for according to the static var generator The reference current I _SVG and the reference value received by the static var generator calculate an additional control signal sent to the static var generator; and a control signal limiter module for adjusting the additional control signal to Make the control signal within a preset range.

According to the broadband additional sub/super synchronous oscillation control system of the embodiment of the present invention, the total current on the fan side or the line side is collected in real time, and the additional control signal is calculated. At the frequency, the static var generator is equivalent to an inductive impedance connected in parallel at the busbar, which destroys the conditions for the occurrence of system resonance, thereby effectively suppressing the sub/supersynchronous resonance of the system when the wind farm is connected.

In addition, the broadband additional sub/super-synchronous oscillation control system according to the above-mentioned embodiment of the present invention may also have the following additional technical features:

Further, the filtering module includes: a band-stop filter, which is used to filter out the fundamental component of the total current i _c on the fan side or the total current i _L on the line side; and/or a band-pass filter, which filters out the subsynchronous and supersynchronous harmonic components.

Further, the calculation of the additional control signal is further used for: when the reference value received by the static var generator is current, wherein, is the additional current reference signal of the static var generator; when the static var generator occurs When the reference value received by the receiver is the access bus voltage, Wherein, is the additional voltage reference signal of the static var generator; when the reference value received by the static var generator is reactive power, Δq ^* =I _SVG,abc ·V _abc , where Δq ^* is the static voltage The additional instantaneous reactive power reference value of the power generator, V _abc represents the three-phase voltage fundamental component of the static reactive power compensator connected to the bus.

Additional aspects and advantages of the present invention will be set forth, in part, from the following description, and in part will be apparent from the following description, or may be learned by practice of the invention.

Description of drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of embodiments taken in conjunction with the accompanying drawings, wherein:

FIG. 1 is a flowchart of a broadband additional sub/super synchronous oscillation control method according to an embodiment of the present invention;

2 is a schematic diagram of the working principle of a broadband additional sub/super-synchronous oscillation control method according to an embodiment of the present 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 ways

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

In the description of the present invention, it should be understood that the terms "center", "portrait", "horizontal", "top", "bottom", "front", "rear", "left", "right", " The orientation or positional relationship indicated by vertical, horizontal, top, bottom, inner, outer, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and The description is simplified rather than indicating or implying that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

These and other aspects of embodiments of the present invention will become apparent with reference to the following description and accompanying drawings. In these descriptions and drawings, some specific implementations of the embodiments of the invention are specifically disclosed to represent some ways of implementing the principles of the embodiments of the invention, but it should be understood that the scope of the embodiments of the invention is not limited by this limit. On the contrary, embodiments of the present invention include all changes, modifications and equivalents falling within the spirit and scope of the appended claims.

After a lot of creative work, the inventor of the present application found that when the equivalent inductive reactance and capacitive reactance parameters of the entire system are properly matched (satisfying the resonance condition) after the wind turbine is connected to the grid, resonance will occur, and the effective method to eliminate resonance is often Change the way the system operates to change the system parameters and disrupt the resonance conditions. Therefore, one of the most basic solutions to the above-mentioned sub/supersynchronous resonance problem caused by the connection of wind farms is to destroy the conditions for the occurrence of system resonance. By taking certain additional measures, such as paralleling static var generators (SVG) and using appropriate control to avoid the formation of unfavorable resonant circuits, the sub/supersynchronous resonance problem of the system can be effectively suppressed.

The following describes a broadband additional sub/super synchronous oscillation control method according to an embodiment of the present invention with reference to the accompanying drawings.

1 is a flowchart of a method for controlling broadband additional sub/super synchronous oscillation according to an embodiment of the present invention, and FIG. 2 is a schematic diagram showing the working principle of a method for controlling broadband additional sub/super synchronous oscillation according to an embodiment of the present invention. Please refer to FIG. 1 and FIG. 2, a broadband additional sub/super synchronous oscillation control method, including the following steps:

S1: Collect the total three-phase current i _c on the fan side or the total three-phase current i _L on the line side.

Specifically, the total three-phase current i _c on the fan side or the total three-phase current i _L on the line side is collected. The above-mentioned signals can be collected according to the sampling method at regular intervals, and analog-to-digital conversion is performed on the collected analog signals to obtain corresponding digital quantities. The methods that can realize signal acquisition and analog-to-digital conversion are applicable to the present invention. However, when there are multiple fan-side branches or grid-side branches, the current of each line can be collected separately, and the total current can be obtained by summing up; the branch can also be preferentially selected according to the number of branches in the actual system Signal acquisition is performed on the less side.

S2: Filter the total three-phase current i _c on the fan side or the total three-phase current i _L on the line side, and filter out the sub-synchronous and super-synchronous harmonic components, so as to eliminate the power frequency signal to control the additional sub-/super-synchronous oscillation. method, as well as obtaining the contained harmonic currents. In an example of the present invention, the sub-synchronous and super-synchronous harmonics are respectively 5-45 Hz and 55-95 Hz.

Specifically, in the embodiment of the present invention, the signal filtering processing step is performed next. The purpose of this step is to filter out the fundamental signal from the collected original three-phase current signal, filter out the sub/super-synchronous harmonic components of interest, and reduce the influence of noise at the same time, which can be achieved by one of the following processing methods:

1) Band-stop filter, the purpose is to filter out the fundamental wave component (corresponding to 50Hz in China);

2) Band-pass filter, the purpose is to filter out the sub/super-synchronous frequency signal, in China, its frequency range is in the range of 5-45Hz and 55-95Hz, and its realization forms are various.

3) A combination of 1) and 2) above.

S3: Compensate for the phase delay generated by the measurement, filter and static var generator, and/or perform at least one of a predetermined phase shift and amplitude compensation for the filtered signal.

Specifically, the phase delay caused by the measurement, filter and static var generator is compensated, and/or the necessary phase offset is set according to the control needs. Depending on the system characteristics, the proportional/phase-shifting link can be implemented in one of the following ways:

1) Phase shifter, the purpose is to perform appropriate phase compensation for the filtered current signal, or to set the necessary phase offset according to the control needs. There are various implementation methods, such as high-pass/low-pass filter phase shifter;

2) Proportional link, the purpose is to perform appropriate amplitude compensation on the filtered signal;

3) A series combination of 1) and 2) above.

A typical transfer function implementation is as follows:

Among them, k represents the proportional coefficient; T represents the time constant; n represents the order of the numerator and denominator of the transfer function, which is a positive integer.

S4: Convert the compensated or offset current signal into the reference current I _SVG of the static var generator, including:

When the collected signal is the fan side current _ic ,

When the collected signal is the line side current i _L ,

Among them, I _L,abc (s) and I _c,abc (s) represent the line side and fan side a,b,c three-phase currents after the aforementioned signal processing respectively; _ISVG,abc (s) represents the calculated SVG additional reference current; R _L , L _L represent the equivalent resistance and inductance on the line side, respectively, R _SVG , L _SVG represent the additional equivalent resistance and inductance of the static var generator that can be set, respectively.

S5: Calculate the additional control signal sent to the static var generator according to the reference current I _SVG and the reference value received by the static var generator.

Specifically, the main function of the additional control signal calculation is to calculate the additional control signal that can be directly sent to the static var generator according to the additional current reference value I _SVG obtained by the calculation in the previous step. Corresponding to the different reference values received by the static var generator, this link is divided into the following three cases:

1) When the reference value received by the static var generator is current, the calculation formula of this link is:

in Additional current reference signal for static var generator.

2) When the reference value received by the static var generator is the access bus voltage, the calculation formula of this link is:

in Additional voltage reference signal for static var generator.

3) When the reference value received by the static var generator is reactive power, and the absorption inductive reactive power is taken as the positive direction, the calculation formula of this link is:

Δq ^* =I _SVG,abc ·V _abc

Among them, Δq ^* is the additional instantaneous reactive power reference value of the static var generator, and V _abc represents the three-phase voltage fundamental wave component of the static var compensator connected to the bus.

S6: Adjust the additional control signal so that the control signal is within a preset range.

Specifically, the larger additional control signal may damage the controller of the static var generator, so the control signal amplitude limiting link is required, the main purpose of which is to limit the output control signal amplitude within a certain range. After the 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.

This link can use a simple digital bidirectional limiter, and the typical calculation formula is as follows:

Among them, X _in represents the additional control signal input by the limiting link, corresponding to different reference values received by the static var generator; X _out represents the additional control signal output by the limiting link that actually acts on the static var generator; X _max , X _min respectively represent the acceptable maximum and minimum additional control signal values due to static var compensator or other constraints.

It is worth mentioning that the above signal processing is carried out in abc three-phase coordinates, or the signal can be forward Park transformed first to obtain the amount of the dq coordinate system, and then correspondingly calculated to obtain the control amount in the dq coordinate system. , if the control interface of the static var generator is defined in the dq coordinate system, it can be directly output to the control interface; and if the control interface of the static var generator is defined in the abc coordinate system, through the reverse Transform to Park to get the control signal in abc coordinates.

The broadband additional sub/super synchronous oscillation control method of the embodiment of the present invention has a simple principle of the invention, and can automatically adjust the control signal of the static var generator according to the system characteristics, so as to achieve the purpose of suppressing the sub/super synchronous oscillation; the whole process includes signal acquisition. And conversion, filtering, amplitude limiting, etc., can be realized by simple circuits, the whole structure is simple, easy to implement in engineering, and can adopt a modular structure, flexible and convenient installation and debugging, and easy to expand; for the signal processing of sub/super synchronous oscillations A single broadband mode, with few parameters, is easy to design and adjust on-site, and is suitable for the situation where a single or multiple modes of the system oscillation mode can adopt the same gain and phase shift link.

The following describes a broadband additional sub/super synchronous oscillation control system according to an embodiment of the present invention with reference to the accompanying 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. Please refer to FIG. 3, a broadband additional sub/super synchronous oscillation control system, including: a signal acquisition and conversion module 210, a filter module 220, a proportional phase shift module 230, a reference current calculation module 240, an additional control signal calculation module 250 and Control the signal clipping module 260 .

The signal collection and conversion module 210 is used to collect the total three-phase current i _c on the fan side or the total three-phase current i _L on the line side and convert them into corresponding digital signals.

Specifically, the total three-phase current i _c on the fan side or the total three-phase current i _L on the line side is collected. The above-mentioned signals can be collected according to the sampling method at regular intervals, and analog-to-digital conversion is performed on the collected analog signals to obtain corresponding digital quantities. The methods that can realize signal acquisition and analog-to-digital conversion are applicable to the present invention. However, when there are multiple fan-side branches or grid-side branches, the current of each line can be collected separately, and the total current can be obtained by summing up; the branch can also be preferentially selected according to the number of branches in the actual system Signal acquisition is performed on the less side.

The filtering module 220 is used to filter the total three-phase current i _c on the fan side or the total three-phase current i _L on the line side to filter out sub-synchronous and super-synchronous harmonic components.

In an example of the present invention, the sub-synchronous and super-synchronous harmonic frequencies are respectively 5-45 Hz and 55-95 Hz.

Specifically, in the embodiment of the present invention, the signal filtering processing step is performed next. The purpose of this step is to filter out the fundamental signal from the collected original three-phase current signal, filter out the sub/super-synchronous harmonic components of interest, and reduce the influence of noise at the same time, which can be achieved by one of the following processing methods:

1) Band-stop filter, the purpose is to filter out the fundamental wave component (corresponding to 50Hz in China);

2) Band-pass filter, the purpose is to filter out the sub/super-synchronous frequency signal, in China, its frequency range is in the range of 5-45Hz and 55-95Hz, and its realization forms are various.

3) A combination of 1) and 2) above.

The proportional phase shift module 230 is used to compensate for phase delays generated by the measurement, filter and static var generator, and/or to perform at least one of a predetermined phase shift and corresponding amplitude compensation to the filtered current signal A sort of.

Specifically, the phase delay caused 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 shift link can be implemented by one of the following methods:

1) Phase shifter, the purpose is to perform appropriate phase compensation for the filtered current signal, or to set the necessary phase offset according to the control needs. There are various implementation methods, such as high-pass/low-pass filter phase shifters;

2) Proportional link, the purpose is to perform appropriate amplitude compensation on the filtered signal;

3) A series combination of 1) and 2) above.

A typical transfer function implementation is as follows:

Among them, k represents the proportional coefficient; T represents the time constant; n represents the order of the numerator and denominator of the transfer function, which is a positive integer.

The reference current calculation module 240 is used for converting the compensated or offset current signal into the reference current I _SVG of the static var generator.

Specifically, when the collected signal is the fan-side current _ic ,

When the collected signal is the line side current i _L ,

Among them, I _L,abc (s) and I _c,abc (s) represent the line side and fan side a,b,c three-phase currents after the aforementioned signal processing respectively; _ISVG,abc (s) represents the calculated SVG additional reference current; R _L , L _L represent the equivalent resistance and inductance on the line side, respectively, R _SVG , L _SVG represent the additional equivalent resistance and inductance of the static var generator that can be set, respectively.

The additional control signal calculation module 250 is configured to calculate the additional control signal sent to the static var generator according to the reference current I _SVG of the static var generator and the reference value received by the static var generator.

Specifically, the main function of the additional control signal calculation is to calculate the 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 the different reference values received by the static var generator, this link is divided into the following three cases:

1) When the reference value received by the static var generator is current, the calculation formula of this link is:

in Additional current reference signal for static var generator.

2) When the reference value received by the static var generator is the access bus voltage, the calculation formula of this link is:

in Additional voltage reference signal for static var generator.

3) When the reference value received by the static var generator is reactive power, and the absorption inductive reactive power is taken as the positive direction, the calculation formula of this link is:

Δq ^* =I _SVG,abc ·V _abc

Among them, Δq ^* is the additional instantaneous reactive power reference value of the static var generator, and V _abc represents the three-phase voltage fundamental wave component of the static var compensator connected to the bus.

The control signal limiting module 260 is configured to adjust the additional control signal so that the control signal is within a preset range.

Specifically, the larger additional control signal may damage the controller of the static var generator, so the control signal amplitude limiting link is required, the main purpose of which is to limit the output control signal amplitude within a certain range. After the 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.

This link can use a simple digital bidirectional limiter, and the typical calculation formula is as follows:

Among them, X _in represents the additional control signal input by the limiting link, corresponding to different reference values received by the static var generator; X _out represents the additional control signal output by the limiting link that actually acts on the static var generator; X _max , X _min represent the acceptable maximum and minimum additional control signal values due to static var generators or other constraints, respectively.

It is worth mentioning that the above signal processing is carried out in abc three-phase coordinates, or the signal can be forward Park transformed first to obtain the amount of the dq coordinate system, and then correspondingly calculated to obtain the control amount in the dq coordinate system. , if the control interface of the static var generator is defined in the dq coordinate system, it can be directly output to the control interface; and if the control interface of the static var generator is defined in the abc coordinate system, through the reverse Transform to Park to get the control signal in abc coordinates.

The broadband additional sub/super synchronous oscillation control method of the embodiment of the present invention has a simple principle of the invention, and can automatically adjust the control signal of the static var generator according to the system characteristics, so as to achieve the purpose of suppressing the sub/super synchronous oscillation; the whole process includes signal acquisition. And conversion, filtering, amplitude limiting, etc., can be realized by simple circuits, the whole structure is simple, easy to implement in engineering, and can adopt a modular structure, flexible and convenient installation and debugging, and easy to expand; for the signal processing of sub/super synchronous oscillations A single broadband mode, with few parameters, is easy to design and adjust on-site, and is suitable for the situation where a single or multiple modes of the system oscillation mode can adopt the same gain and phase shift link.

In addition, other structures and functions of the broadband additional sub/super-synchronous oscillation control method and control system according to the embodiments of the present invention are known to those skilled in the art, and will not be repeated in order to reduce redundancy.

In the description of this specification, description with reference to the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples", etc., mean specific features described in connection with the embodiment or example , structure, material or feature is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms 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.

Although embodiments of the present 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 in these embodiments without departing from the principles and spirit of the invention, The scope of the invention is defined by the claims and their equivalents.

Claims (5)

1. a broadband additional sub/super-synchronous oscillation control method, is characterized in that, comprises the following steps: S1: Collect the total three-phase current i _c on the fan side or the total three-phase current i _L on the line side; S2: filter the total three-phase current i _c on the fan side or the total three-phase current i _L on the line side to filter out sub-synchronous and super-synchronous harmonic components; S3: Compensate for the phase delay generated by the measurement, filter and static var generator, and/or perform at least one of predetermined phase offset and amplitude compensation; S4: Convert the compensated or offset current signal into the reference current I _SVG of the static var generator, including: When the collected signal is the fan side current _ic , When the collected signal is the line side current i _L , Among them, I _L,abc (s) and I _c,abc (s) represent the line side and fan side a,b,c three-phase currents after the aforementioned signal processing respectively; _ISVG,abc (s) represents the calculated SVG additional reference current; R _L , L _L represent the equivalent resistance and inductance on the line side, respectively, R _SVG , L _SVG represent the additional equivalent resistance and inductance of the static var generator that can be set; S5: Calculate the additional control signal sent to the static var generator according to the static var generator reference current I _SVG and the reference value received by the static var generator; S6: Adjust the additional control signal so that the additional control signal is within a preset range. 2. The broadband additional sub/super-synchronous oscillation control method according to claim 1, wherein step S2 further comprises: using a band-stop filter to filter out the fundamental component of the total current i _c on the fan side or the total current i _L on the line side; and/or The subsynchronous and supersynchronous harmonic components are filtered out using a bandpass filter. 3. The broadband additional sub/super-synchronous oscillation control method according to claim 1, wherein step S5 further comprises: When the reference value received by the static var generator is current, in, is the additional current reference signal of the static var generator; When the reference value received by the static var generator is the access bus voltage, in, is the additional voltage reference signal of the static var generator; When the reference value received by the static var generator is reactive power, Δq ^* =I _SVG,abc ·V _abc Among them, Δq ^* is the additional instantaneous reactive power reference value of the static var generator, and V _abc represents the three-phase voltage fundamental wave component of the static var compensator connected to the bus. 4. A broadband additional sub/super-synchronous oscillation control system, characterized in that, comprising: The signal acquisition and conversion module is used to collect the total three-phase current i _c on the fan side or the total three-phase current i _L on the line side, and convert them into corresponding digital signals; a filtering module, configured to filter the total three-phase current i _c on the fan side or the total three-phase current i _L on the line side to filter out sub-synchronous and super-synchronous harmonic components; A proportional phase-shifting module for compensating for phase delays generated by measurements, filters and static var generators, and/or performing at least one of predetermined phase offset and amplitude compensation; The reference current calculation module is used to convert the compensated or offset current signal into the reference current I _SVG of the static var generator; An additional control signal calculation module, configured to calculate an additional control signal sent to the static var generator according to the static var generator reference current I _SVG and the reference value received by the static var generator, wherein the The additional control signal calculations described above are further used to: When the reference value received by the static var generator is current, in, is the additional current reference signal of the static var generator, I _SVG,abc (s) represents the obtained SVG additional reference current; When the reference value received by the static var generator is the access bus voltage, in, is the additional voltage reference signal of the static var generator, R _L and L _L represent the equivalent resistance and inductance on the line side respectively; When the reference value received by the static var generator is reactive power, Δq ^* =I _SVG,abc ·V _abc where Δq ^* is the additional instantaneous reactive power reference value of the static var generator, and V _abc represents the three-phase voltage fundamental component of the static var compensator connected to the bus; and The control signal limiting module is configured to adjust the additional control signal so that the additional control signal is within a preset range. 5. The broadband additional sub/super-synchronous oscillation control system according to claim 4, wherein the filtering module comprises: A band-stop filter for filtering out the fundamental component of the total current i _c on the fan side or the total current i _L on the line side; and/or A bandpass filter that filters out the subsynchronous and supersynchronous harmonic components.