CN105515021B - Additional secondary/supersynchronous oscillation control method of multi-mode and control system - Google Patents
Additional secondary/supersynchronous oscillation control method of multi-mode and control system Download PDFInfo
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Abstract
本发明公开了一种多模式附加次/超同步振荡控制方法及控制系统,该方法包括:采集风机侧的总三相电流ic或者线路侧的总三相电流iL;根据风机侧的总三相电流ic或者线路侧的总三相电流iL计算得到多个模式控制信号;对多个模式控制信号进行加和运算,以得到附加控制信号;对附加控制信号进行限幅处理,以使附加控制信号的幅值位于第一预设范围内。本发明的方法能够有效抑制风电场接入时系统的次/超同步振荡。
The invention discloses a multi-mode additional secondary/super synchronous oscillation control method and control system. The method includes: collecting the total three-phase current i c on the fan side or the total three-phase current i L on the line side; The three-phase current i c or the total three-phase current i L of the line side are calculated to obtain multiple mode control signals; the multiple mode control signals are summed to obtain additional control signals; the additional control signals are subjected to limiting processing to obtain Make the amplitude of the additional control signal within the first preset range. The method of the invention can effectively suppress the sub/super synchronous oscillation of the system when the wind farm is connected.
Description
技术领域technical field
本发明涉及电力系统控制技术领域,具体涉及一种多模式附加次/超同步振荡控制方法及控制系统。The invention relates to the technical field of power system control, in particular to a multi-mode additional sub/super synchronous oscillation control method and control system.
背景技术Background technique
风能是分布广泛的清洁可持续能源,我国风力发电正持续快速发展。考虑到我国的资源和负荷中心的逆向分布,大规模风电远距离外送成为必然趋势。当风电场通过含串联补偿电容输电线路外送功率时可能会发生以感应发电机效应为主的次/超同步谐振或振荡,影响电力系统的安全稳定运行。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 long-distance transmission has become an inevitable trend. When the wind farm transmits power through the transmission line with series compensation capacitors, sub/supersynchronous resonance or oscillation may occur, which mainly affects the safe and stable operation of the power system.
发明内容Contents of the invention
本发明旨在至少解决上述技术问题之一。The present invention aims to solve at least one of the above-mentioned technical problems.
为此,本发明的一个目的在于提出一种多模式附加次/超同步振荡控制方法,该方法能够有效抑制风电场接入时系统的次/超同步振荡。Therefore, an object of the present invention is to propose a multi-mode additional sub/supersynchronous oscillation control method, which can effectively suppress the sub/supersynchronous oscillation of the system when the wind farm is connected.
本发明的另一个目的在于提出一种多模式附加次/超同步振荡控制系统。Another object of the present invention is to propose a multi-mode additive sub/supersynchronous oscillation control system.
为了实现上述目的,本发明第一方面的实施例公开了一种多模式附加次/超同步振荡控制方法,包括以下步骤:S1:采集风机侧的总三相电流ic或者线路侧的总三相电流iL;S2:根据所述风机侧的总三相电流ic或者线路侧的总三相电流iL计算得到多个模式控制信号;S3:对所述多个模式控制信号进行加和运算,以得到附加控制信号;以及S4:对所述附加控制信号进行限幅处理,以使所述附加控制信号的幅值位于第一预设范围内。In order to achieve the above object, the embodiment of the first aspect of the present invention discloses a multi-mode additional sub/supersynchronous oscillation control method, including the following steps: S1: collecting the total three-phase current ic at the fan side or the total three-phase current at the line side Phase current i L ; S2: calculate multiple mode control signals according to the total three-phase current i c on the fan side or the total three-phase current i L on the line side; S3: sum the multiple mode control signals and perform an operation to obtain an additional control signal; and S4: perform amplitude limiting processing on the additional control signal, so that the amplitude of the additional control signal is within a first preset range.
根据本发明实施例的多模式附加次/超同步振荡控制方法,实时采集风机侧或者线路侧的总电流,计算出附加控制信号,通过控制静止无功发生器,在振荡发生的次/超同步频率处,将静止无功发生器等效为并联在母线处的感性阻抗,破坏系统振荡发生的条件,从而有效抑制风电场接入时系统的次/超同步振荡。According to the multi-mode additional sub/supersynchronous 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. By controlling the static var generator, the sub/supersynchronous At the frequency, the static var generator is equivalent to the inductive impedance connected in parallel at the busbar, which destroys the conditions for the system oscillation to effectively suppress the sub/super synchronous oscillation of the system when the wind farm is connected.
另外,根据本发明上述实施例的多模式附加次/超同步振荡控制方法还可以具有如下附加的技术特征:In addition, the multi-mode additional sub/supersynchronous oscillation control method according to the above-mentioned embodiments of the present invention may also have the following additional technical features:
进一步地,所述S2进一步包括:S21:对所述风机侧的总三相电流ic或者所述线路侧的总三相电流iL进行滤波,滤出次同步和超同步谐波分量;S22:对测量、滤波器和所述静止无功发生器产生的相位延迟进行补偿,和/或进行预定的相位偏移和幅值补偿;S23:将经相位补偿和/或偏移后的电流信号转化为静止无功发生器的三相参考电流ISVG,abc,k,具体包括:Further, the S2 further includes: S21: Filtering 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; S22 : Compensate the phase delay generated by the measurement, filter and the static var generator, and/or perform predetermined phase offset and amplitude compensation; S23: The current signal after phase compensation and/or offset Transformed into the three-phase reference current I SVG,abc,k of the static var generator, including:
当采集的信号为风机侧的总三相电流ic时,When the collected signal is the total three-phase current ic on the fan side,
当采集的信号为线路侧的总三相电流iL时,When the collected signal is the total three-phase current i L on the line side,
其中,IL,abc,k(s)和Ic,abc,k(s)分别表示模式k中经前述信号处理后的线路侧和风机侧的a,b,c三相电流,k=1,…,N,N为被控制的模式总数目,ISVG,abc,k(s)表示模式k中计算出的静止无功发生器的三相参考电流的a,b,c三相值,RL、LL分别表示线路侧的等效电阻和电感,RSVG,k、LSVG,k为控制参数,分别表示模式k中可设定的静止无功发生器的附加等效电阻和电感;S24:根据所述静止无功发生器的三相参考电流ISVG,abc,k和所述静止无功发生器接收到的参考值计算发送给所述静止无功发生器的多个模式控制信号;S25:对所述多个模式控制信号进行限幅处理,以使所述多个模式控制信号的幅值位于第二预设范围内。Among them, I L, abc, k (s) and I c, abc, k (s) respectively represent the a, b, c three-phase currents of the line side and the fan side after the aforementioned signal processing in mode k, k=1 ,...,N, N is the total number of modes to be controlled, I SVG,abc,k (s) represents the a,b,c three-phase values of the three-phase reference current of the static var generator calculated in mode k, R L , L L respectively represent the equivalent resistance and inductance of the line side, R SVG,k , L SVG,k are control parameters, respectively represent the additional equivalent resistance and inductance of the static var generator that can be set in mode k ; S24: According to the three-phase reference current ISVG,abc,k of the static var generator and the reference value received by the static var generator, calculate a plurality of mode controls sent to the static var generator Signal; S25: Perform limit processing on the multiple mode control signals, so that the amplitudes of the multiple mode control signals are within a second preset range.
进一步地,所述S21进一步包括:通过带通滤波器得到所述次同步和超同步谐波分量;和/或通过将带通滤波器与带阻滤波器或低通/高通滤波器串联的方式滤除所述风机侧的总三相电流ic或者所述线路侧的总三相电流iL的基波分量,并得到所述次同步和超同步谐波分量。Further, the S21 further includes: obtaining the sub-synchronous and super-synchronous harmonic components through a band-pass filter; and/or connecting the band-pass filter in series with a band-stop filter or a low-pass/high-pass filter Filter out the fundamental component of the total three-phase current ic on the fan side or the total three-phase current i L on the line side, and obtain the sub-synchronous and super-synchronous harmonic components.
进一步地,步骤S24进一步包括:当所述静止无功发生器接收到的参考值为电流时,Further, step S24 further includes: when the reference value received by the static var generator is current,
其中,为所述静止无功发生器对应于模式k的附加模式电流控制信号;in, is the additional mode current control signal corresponding to mode k of the static var generator;
当所述静止无功发生器接收到的参考值为接入母线电压时,When the reference value received by the static var generator is connected to the bus voltage,
其中,为所述静止无功发生器对应于模式k的附加模式电压控制信号;in, is an additional mode voltage control signal corresponding to mode k of the static var generator;
当所述静止无功发生器接收的参考值为无功功率时,When the reference value received by the static var generator is reactive power,
其中,为静止无功发生器对应于模式k的附加瞬时无功功率模式控制信号,Vabc表示所述静止无功发生器接入母线的三相电压基波分量。in, is the additional instantaneous reactive power mode control signal of the static var generator corresponding to mode k, and V abc represents the three-phase voltage fundamental component of the static var generator connected to the bus.
进一步地,在所述S3中,通过对所述多个模式控制信号进行直接相加以得到所述附加控制信号;或者Further, in the S3, the additional control signal is obtained by directly adding the multiple mode control signals; or
设置多个模式控制信号的权重,并将所述多个模式控制信号按照权重比例相加,以得到所述附加控制信号,具体包括:Setting the weights of multiple mode control signals, and adding the multiple mode control signals according to the weight ratio to obtain the additional control signal, specifically includes:
其中,wk为权重因子,直接相加时wk=1,Xk为对应于模式k的模式控制信号,X为所述附加控制信号,N为模式总数。Wherein, w k is a weighting factor, w k =1 when directly added, X k is a mode control signal corresponding to mode k, X is the additional control signal, and N is the total number of modes.
为了实现上述目的,本发明第二方面的实施例公开了一种多模式附加次/超同步振荡控制系统,包括:信号采集与转换模块,所述信号采集与转换模块用于实时采集风机侧的总三相电流ic或者线路侧的总三相电流iL,并转化为相应的数字信号;附加控制模块,所述附加控制模块用于根据所述风机侧的总三相电流ic或者线路侧的总三相电流iL计算得到多个模式控制信号;模式控制信号加和模块,所述模式控制信号加和模块用于对所述多个模式控制信号进行加和运算,以得到附加控制信号;以及附加控制信号限幅模块,所述附加控制信号限幅模块用于对所述附加控制信号进行限幅处理,以使所述附加控制信号的幅值位于第一预设范围内。In order to achieve the above object, the embodiment of the second aspect of the present invention discloses a multi-mode additional sub/supersynchronous oscillation control system, including: a signal acquisition and conversion module, the signal acquisition and conversion module is used for real-time acquisition of fan side The total three-phase current ic or the total three-phase current i L of the line side, and convert it into a corresponding digital signal; an additional control module, the additional control module is used for according to the total three-phase current ic of the fan side or the line The total three-phase current i L on the side is calculated to obtain multiple mode control signals; the mode control signal summing module is used to sum the multiple mode control signals to obtain additional control signal; and an additional control signal limiting module, the additional control signal limiting module is configured to limit the additional control signal, so that the amplitude of the additional control signal is within a first preset range.
根据本发明实施例的多模式附加次/超同步振荡控制系统,实时采集风机侧或者线路侧的总三相电流,计算出附加控制信号,通过控制静止无功发生器,在振荡发生的次/超同步频率处,将静止无功发生器等效为并联在母线处的感性阻抗,破坏系统振荡发生的条件,从而有效抑制风电场接入时系统的次/超同步振荡。According to the multi-mode additional secondary/supersynchronous oscillation control system of the embodiment of the present invention, the total three-phase current on the fan side or the line side is collected in real time, and the additional control signal is calculated. By controlling the static var generator, the secondary/supersynchronous oscillation occurs At the supersynchronous frequency, the static var generator is equivalent to the inductive impedance connected in parallel at the busbar, which destroys the conditions for the system oscillation to effectively suppress the sub/supersynchronous oscillation of the system when the wind farm is connected.
另外,根据本发明上述实施例的多模式附加次/超同步振荡控制系统还可以具有如下附加的技术特征:In addition, the multi-mode additional sub/supersynchronous oscillation control system according to the above-mentioned embodiments of the present invention may also have the following additional technical features:
进一步地,所述附加控制模块包括:滤波模块,所述滤波模块用于对所述风机侧的总三相电流ic或者所述线路侧的总三相电流iL进行滤波,滤出次同步和超同步谐波分量;比例/移相模块,所述比例/移相模块用于对测量、滤波器和所述静止无功发生器产生的相位延迟进行补偿,和/或进行预定的相位偏移和幅值补偿;参考电流计算模块,所述参考电流计算模块用于将经相位补偿和/或偏移后的电流信号转化为静止无功发生器的三相参考电流ISVG,abc,k,具体包括:Further, the additional control module includes: a filtering module, 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, and filter out the secondary synchronous and supersynchronous harmonic components; a scaling/phasing module for compensating for phase delays produced by measurements, filters and the static var generator, and/or performing a predetermined phase shift shift and amplitude compensation; reference current calculation module, the reference current calculation module is used to convert the current signal after phase compensation and/or offset into the three-phase reference current I SVG,abc,k of the static var generator , including:
当采集的信号为风机侧的总三相电流ic时,When the collected signal is the total three-phase current ic on the fan side,
当采集的信号为线路侧的总三相电流iL时,When the collected signal is the total three-phase current i L on the line side,
其中,IL,abc,k(s)和Ic,abc,k(s)分别表示模式k中经前述信号处理后的线路侧和风机侧的a,b,c三相电流,k=1,…,N,N为被控制的模式总数目,ISVG,abc,k(s)表示模式k中计算出的静止无功发生器的三相参考电流的a,b,c三相值,RL、LL分别表示线路侧的等效电阻和电感,RSVG,k、LSVG,k为控制参数,分别表示模式k中可设定的静止无功发生器的附加等效电阻和电感;模式控制信号计算模块,所述模式控制信号计算模块用于根据所述静止无功发生器的三相参考电流ISVG,abc,k和所述静止无功发生器接收到的参考值计算发送给所述静止无功发生器的多个模式控制信号;模式控制信号限幅模块,所述模式控制信号限幅模块用于对所述多个模式控制信号进行限幅处理,以使所述多个模式控制信号的幅值位于第二预设范围内。Among them, I L, abc, k (s) and I c, abc, k (s) respectively represent the a, b, c three-phase currents of the line side and the fan side after the aforementioned signal processing in mode k, k=1 ,...,N, N is the total number of modes to be controlled, I SVG,abc,k (s) represents the a,b,c three-phase values of the three-phase reference current of the static var generator calculated in mode k, R L , L L respectively represent the equivalent resistance and inductance of the line side, R SVG,k , L SVG,k are control parameters, respectively represent the additional equivalent resistance and inductance of the static var generator that can be set in mode k ; The mode control signal calculation module, the mode control signal calculation module is used to calculate and send according to the three-phase reference current ISVG, abc, k of the static var generator and the reference value received by the static var generator A plurality of mode control signals for the static var generator; a mode control signal limiting module, the mode control signal limiting module is used to limit the plurality of mode control signals, so that the multiple The amplitude of each mode control signal is within the second preset range.
进一步地,所述滤波模块用于:通过带通滤波器得到所述次同步和超同步谐波分量;和/或通过将带通滤波器与带阻滤波器或低通/高通滤波器串联的方式滤除所述风机侧的总三相电流ic或者所述线路侧的总三相电流iL的基波分量,并得到所述次同步和超同步谐波分量。Further, the filter module is used to: obtain the sub-synchronous and super-synchronous harmonic components through a band-pass filter; and/or connect the band-pass filter to a band-stop filter or a low-pass/high-pass filter way to filter out the fundamental component of the total three-phase current i c on the fan side or the total three-phase current i L on the line side, and obtain the sub-synchronous and super-synchronous harmonic components.
进一步地,所述模式控制信号计算模块用于:当所述静止无功发生器接收到的参考值为电流时,Further, the mode control signal calculation module is used for: when the reference value received by the static var generator is current,
其中,为所述静止无功发生器对应于模式k的附加模式电流控制信号;in, is the additional mode current control signal corresponding to mode k of the static var generator;
当所述静止无功发生器接收到的参考值为接入母线电压时,When the reference value received by the static var generator is connected to the bus voltage,
其中,为所述静止无功发生器对应于模式k的附加模式电压控制信号;in, is an additional mode voltage control signal corresponding to mode k of the static var generator;
当所述静止无功发生器接收的参考值为无功功率时,When the reference value received by the static var generator is reactive power,
其中,为静止无功发生器对应于模式k的附加瞬时无功功率模式控制信号,Vabc表示所述静止无功发生器接入母线的三相电压基波分量。in, is the additional instantaneous reactive power mode control signal of the static var generator corresponding to mode k, and V abc represents the three-phase voltage fundamental component of the static var generator connected to the bus.
进一步地,其中,模式控制信号加和模块用于:将所述多个模式控制信号直接相加以得到所述附加控制信号;或者设置多个模式控制信号的权重,并将所述多个模式控制信号按照权重比例相加,以得到所述附加控制信号,具体包括:Further, wherein the mode control signal addition module is used to: directly add the multiple mode control signals to obtain the additional control signal; or set the weights of the multiple mode control signals and control the multiple mode The signals are added according to the weight ratio to obtain the additional control signal, which specifically includes:
其中,wk为权重因子,直接相加时wk=1,Xk为对应于模式k的模式控制信号,X为所述附加控制信号,N为模式总数。Wherein, w k is a weighting factor, w k =1 when directly added, X k is a mode control signal corresponding to mode k, X is the additional control signal, and N is the total number of modes.
本发明的附加方面和优点将在下面的描述中部分给出,部分将从下面的描述中变得明显,或通过本发明的实践了解到。Additional aspects and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
附图说明Description of drawings
本发明的上述和/或附加的方面和优点从结合下面附图对实施例的描述中将变得明显和容易理解,其中:The above and/or additional aspects and advantages of the present invention will become apparent and comprehensible from the description of the embodiments in conjunction with the following drawings, wherein:
图1是本发明一个实施例的多模式附加次/超同步振荡控制方法的流程图;Fig. 1 is the flow chart of the multi-mode additional sub/supersynchronous oscillation control method of an embodiment of the present invention;
图2是本发明一个实施例的多模式附加次/超同步振荡控制方法的工作原理示意图;2 is a schematic diagram of the working principle of a multi-mode additional sub/supersynchronous oscillation control method according to an embodiment of the present invention;
图3是根据本发明一个实施例的多模式附加次/超同步振荡控制方法的整体流程示意图;3 is a schematic diagram of the overall flow of a multi-mode additional sub/supersynchronous oscillation control method according to an embodiment of the present invention;
图4是本发明一个实施例的多模式附加次/超同步振荡控制系统的结构示框图;以及Fig. 4 is a block diagram showing the structure of a multi-mode additional sub/supersynchronous oscillation control system according to an embodiment of the present invention; and
图5是本发明一个实施例的附加控制模块的结构框图。Fig. 5 is a structural block diagram of an additional control module of an embodiment of the present invention.
具体实施方式detailed description
下面详细描述本发明的实施例,所述实施例的示例在附图中示出,其中自始至终相同或类似的标号表示相同或类似的元件或具有相同或类似功能的元件。下面通过参考附图描述的实施例是示例性的,仅用于解释本发明,而不能理解为对本发明的限制。Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.
在本发明的描述中,需要理解的是,术语“中心”、“纵向”、“横向”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”等指示的方位或位置关系为基于附图所示的方位或位置关系,仅是为了便于描述本发明和简化描述,而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作,因此不能理解为对本发明的限制。此外,术语“第一”、“第二”仅用于描述目的,而不能理解为指示或暗示相对重要性。In describing the present invention, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", " The orientations or positional relationships indicated by "vertical", "horizontal", "top", "bottom", "inner" and "outer" are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and Simplified descriptions, 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 thus should not be construed as limiting the invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and should not be understood as indicating or implying relative importance.
在本发明的描述中,需要说明的是,除非另有明确的规定和限定,术语“安装”、“相连”、“连接”应做广义理解,例如,可以是固定连接,也可以是可拆卸连接,或一体地连接;可以是机械连接,也可以是电连接;可以是直接相连,也可以通过中间媒介间接相连,可以是两个元件内部的连通。对于本领域的普通技术人员而言,可以具体情况理解上述术语在本发明中的具体含义。In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.
参照下面的描述和附图,将清楚本发明的实施例的这些和其他方面。在这些描述和附图中,具体公开了本发明的实施例中的一些特定实施方式,来表示实施本发明的实施例的原理的一些方式,但是应当理解,本发明的实施例的范围不受此限制。相反,本发明的实施例包括落入所附加权利要求书的精神和内涵范围内的所有变化、修改和等同物。These and other aspects of embodiments of the invention will become apparent with reference to the following description and drawings. In these descriptions and drawings, some specific implementation manners in the embodiments of the present invention are specifically disclosed to represent some ways of implementing the principles of the embodiments of the present invention, but it should be understood that the scope of the embodiments of the present invention is not limited by this limit. On the contrary, the embodiments of the present invention include all changes, modifications and equivalents coming within the spirit and scope of the appended claims.
本申请的发明人经过大量创造性劳动发现,当风机并网后整个系统中的等效感抗与容抗参数匹配恰当(满足振荡条件)时,即会发生振荡,消除振荡常常采取的有效方法是改变系统运行方式以改变系统参数,破坏振荡发生的条件。因此针对上述风电场接入引起的次/超同步振荡问题,最基本的解决方法之一是破坏系统振荡发生的条件。通过采取一定的附加措施,如并联静止无功发生器(Static Var Generator,SVG)并采用适当的控制,避免形成不利的振荡回路,可有效抑制系统的次/超同步振荡问题。The inventor of the present application has discovered through a lot of creative work that when the equivalent inductive reactance and capacitive reactance parameters in the whole system match properly (satisfy the oscillation condition) after the fan is connected to the grid, oscillation will occur, and the effective method often adopted to eliminate oscillation is Change the operating mode of the system to change the system parameters and destroy the conditions for the oscillation to occur. Therefore, one of the most basic solutions to the above-mentioned sub/supersynchronous oscillation problem caused by the connection of wind farms is to destroy the conditions for system oscillation to occur. By taking certain additional measures, such as paralleling static var generators (Static Var Generator, SVG) and adopting appropriate control, avoiding the formation of unfavorable oscillation loops, the sub/supersynchronous oscillation problem of the system can be effectively suppressed.
以下结合附图描述根据本发明实施例的多模式附加次/超同步振荡控制方法及控制系统。The following describes the multi-mode additional sub/supersynchronous oscillation control method and control system according to the embodiments of the present invention with reference to the accompanying drawings.
图1是本发明一个实施例的多模式附加次/超同步振荡控制方法的流程图。图2是是本发明一个实施例的多模式附加次/超同步振荡控制方法的工作原理示意图。图3是根据本发明一个实施例的多模式附加次/超同步振荡控制方法的整体流程示意图。结合图1、图2和图3,根据本发明实施例的多模式附加次/超同步振荡控制方法,包括以下步骤:FIG. 1 is a flowchart of a multi-mode additional sub/supersynchronous oscillation control method according to an embodiment of the present invention. FIG. 2 is a schematic diagram of the working principle of the multi-mode additional sub/supersynchronous oscillation control method according to an embodiment of the present invention. Fig. 3 is a schematic flow chart of a multi-mode additional sub/supersynchronous oscillation control method according to an embodiment of the present invention. 1, 2 and 3, the multi-mode additional sub/supersynchronous oscillation control method according to the embodiment of the present invention includes the following steps:
S1:采集风机侧的总三相电流ic或者线路侧的总三相电流iL。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.
具体地说,为了实现本发明实施例的多模式附加次/超同步振荡控制方法,首先需要准确采集系统信号。即采集系统中的电气量,并通过模数转换产生相应的数字信号。特别地,如图3所示,在本示例中,所采集的电气量包括:风机侧的总三相电流ic或者线路侧的总三相电流iL。Specifically, in order to realize the multi-mode additional sub/supersynchronous oscillation control method of the embodiment of the present invention, it is first necessary to accurately collect system signals. That is to collect the electrical quantities in the system and generate corresponding digital signals through analog-to-digital conversion. In particular, as shown in FIG . 3 , in this example, the collected electrical quantities include: the total three-phase current ic at the fan side or the total three-phase current i L at the line side.
其中,对于上述信号可以按照定间隔采样方法进行采集,对采集到的模拟信号进行模数转换,获得相应的数字量。可实现信号采集以及模数转换的方法均适用于本发明的实施例。但风机侧支路或电网侧支路是多条时,可分别采集各条线路的电流,并通过加和的方式得到总电流;也可以根据实际系统中支路数的多少,优先选择支路少的一侧进行信号采集。Wherein, the above-mentioned signals may be collected according to a fixed-interval sampling method, and analog-to-digital conversion is performed on the collected analog signals to obtain corresponding digital quantities. Methods that can realize signal acquisition and analog-to-digital conversion are applicable to the embodiments of the present invention. However, when there are multiple branches on the fan side or grid side, the current of each line can be collected separately, and the total current can be obtained by summing; the branch can also be selected preferentially according to the number of branches in the actual system Signal acquisition is performed on the less side.
S2:根据风机侧的总三相电流ic或者线路侧的总三相电流iL计算得到多个模式控制信号。S2: Calculate and obtain multiple mode control signals according to the total three-phase current i c on the fan side or the total three-phase current i L on the line side.
具体地说,该步骤S2的目的是通过采集到的三相电流信号计算多个模式控制信号,并将该过程中计算得到的模式控制信号作为后续计算附加控制信号的输入量,系统中每一个次/超同步谐波频带对应一个次/超同步振荡模式,针对每一个模式设立一个模式附加控制模块,该附加控制模块例如又包括以下子环节:模式滤波、比例/移相、参考电流计算、模式控制信号计算和模式控制信号限幅。以下以模式k为例说明其实现方式,k=1,…,N(N为被控制的模式总数目)。Specifically, the purpose of this step S2 is to calculate multiple mode control signals through the collected three-phase current signals, and use the mode control signals calculated in this process as the input for subsequent calculation of additional control signals. The sub/supersynchronous harmonic frequency band corresponds to a sub/supersynchronous oscillation mode, and an additional mode control module is set up for each mode. The additional control module includes the following sub-links, for example: mode filtering, proportional/phase shifting, reference current calculation, Mode control signal calculation and mode control signal clipping. Hereinafter, mode k is taken as an example to illustrate its implementation, k=1,...,N (N is the total number of controlled modes).
具体地,在本发明的一个实施例中,步骤S2进一步包括:Specifically, in one embodiment of the present invention, step S2 further includes:
S21:对风机侧的总三相电流ic或者线路侧的总三相电流iL进行滤波,滤出次同步和超同步谐波分量。本步骤即滤波环节,为了消除工频信号对该附加次/超同步振荡控制方法的影响,以及获得所包含的次/超同步谐波电流分量,滤波环节十分重要。滤波环节的主要作用是滤掉风机侧的总三相电流ic或者线路侧的总三相电流iL的基波分量,滤出模式k对应的次/超同步谐波电流分量。S21: Filtering the total three-phase current i c at the fan side or the total three-phase current i L at the line side to filter out sub-synchronous and super-synchronous harmonic components. This step is the filtering link, which is very important in order to eliminate the influence of the power frequency signal on the additional sub/supersynchronous oscillation control method and to obtain the included sub/supersynchronous harmonic current components. The main function of the filtering link is to filter out the fundamental component of 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/supersynchronous harmonic current components corresponding to mode k.
参照图3所示,也即是说,步骤S21即从原始三相电流信号中过滤出模式k所对应的次/超同步谐波分量,同时降低基波和噪声的影响。在本发明的一个实施例中,例如可采用以下两种信号处理方法实现:Referring to FIG. 3 , that is to say, step S21 is to filter out the sub/super synchronous harmonic component corresponding to mode k from the original three-phase current signal, while reducing the influence of the fundamental wave and noise. In one embodiment of the present invention, for example, the following two signal processing methods can be used to realize:
1.通过带通滤波器得到次同步和超同步谐波分量。带通滤波器的中心频率对应需过滤出的模式k对应次/超同步频率,具体实现形式多样,此处不再赘述。和/或1. Obtain sub-synchronous and super-synchronous harmonic components through a band-pass filter. The center frequency of the band-pass filter corresponds to the mode k to be filtered out and corresponds to the sub/super synchronous frequency, and there are various specific implementation forms, which will not be repeated here. and / or
2.通过将带通滤波器与带阻滤波器或低通/高通滤波器串联的方式滤除风机侧的总三相电流ic或者线路侧的总三相电流iL的基波分量(中国对应50Hz)和其它频率成分的干扰,并得到次同步和超同步谐波分量,该方式的实现形式多样,此处不再赘述。2. Filter out the fundamental component of the total three-phase current i c on the fan side or the total three-phase current i L on the line side by connecting a band-pass filter in series with a band-stop filter or a low-pass/high-pass filter (China Corresponding to the interference of 50 Hz) and other frequency components, and obtaining sub-synchronous and super-synchronous harmonic components, there are various implementation forms of this method, which will not be repeated here.
S22:对测量、滤波器和静止无功发生器产生的相位延迟进行补偿,和/或进行预定的相位偏移(根据实际控制需求设定)和幅值补偿,从而提高附加振荡控制方法的效果。S22: Compensate for the phase delay generated by the measurement, filter and static var generator, and/or perform predetermined phase offset (set according to actual control requirements) and amplitude compensation, thereby improving the effect of the additional oscillation control method .
在具体示例中,根据系统特性,步骤S22中的比例/移相环节例如可采用以下方法之一实现:In a specific example, according to the characteristics of the system, the ratio/phase shift link in step S22 can be realized by one of the following methods, for example:
1)移相器,目的是对采集的电流信号进行适当的相位补偿,实现方法多样,譬如高通/低通滤波式移相器等。1) The phase shifter, the purpose is to perform appropriate phase compensation on the collected current signal, and there are various implementation methods, such as high-pass/low-pass filter type phase shifter, etc.
2)比例环节,目的是对采集的信号进行适当的幅值补偿。2) Proportional link, the purpose is to carry out appropriate amplitude compensation to the collected signal.
3)上述1)和2)的串联组合。3) A series combination of the above 1) and 2).
典型实现方法的传递函数如下:The transfer function of a typical implementation method is as follows:
其中,g表示比例系数,Tai,k(i=1,...,m),Tbi,k(i=1,...,n)表示时间常数,m,n表示传递函数分子和分母的阶数,m,n均为正整数。Among them, g represents the proportionality coefficient, T ai,k (i=1,...,m), T bi,k (i=1,...,n) represents the time constant, m,n represents the transfer function numerator and The order of the denominator, both m and n are positive integers.
需要说明的是,对于不同的模式可以采用不同的传递函数,即上述传递函数的计算公式中的参数可因受控模式不同而有差异。It should be noted that different transfer functions may be used for different modes, that is, the parameters in the calculation formula of the above transfer function may vary due to different controlled modes.
S23:将经相位补偿和/或偏移后的电流信号转化为静止无功发生器SVG的三相参考电流ISVG,abc,k。对应所采集的电流信号不同,该环节分为以下两种情况,具体为:S23: Transform the current signal after phase compensation and/or offset into a three-phase reference current I SVG,abc,k of the static var generator SVG. Corresponding to the different current signals collected, this link is divided into the following two situations, specifically:
当采集的信号为风机侧的总三相电流ic时,When the collected signal is the total three-phase current ic on the fan side,
当采集的信号为线路侧的总三相电流iL时,When the collected signal is the total three-phase current i L on the line side,
其中,IL,abc,k(s)和Ic,abc,k(s)分别表示模式k中经前述信号处理后的线路侧和风机侧的a,b,c三相电流,k=1,…,N,N为被控制的模式总数目,ISVG,abc,k(s)表示模式k中计算出的静止无功发生器的三相参考电流的a,b,c三相值,RL、LL分别表示线路侧的等效电阻和电感,RSVG,k、LSVG,k为控制参数,分别表示模式k中可设定的静止无功发生器的附加等效电阻和电感,其中RSVG,k可取很小的正值或者零值。Among them, I L, abc, k (s) and I c, abc, k (s) respectively represent the a, b, c three-phase currents of the line side and the fan side after the aforementioned signal processing in mode k, k=1 ,...,N, N is the total number of modes to be controlled, I SVG,abc,k (s) represents the a,b,c three-phase values of the three-phase reference current of the static var generator calculated in mode k, R L , L L respectively represent the equivalent resistance and inductance of the line side, R SVG,k , L SVG,k are control parameters, respectively represent the additional equivalent resistance and inductance of the static var generator that can be set in mode k , where R SVG,k can take a very small positive value or zero value.
S24:根据静止无功发生器的三相参考电流ISVG,abc,k和静止无功发生器接收到的参考值计算发送给静止无功发生器的多个模式控制信号。对应于SVG接收到参考值的不同,该环节可分为以下三种情况,具体为:S24: Calculate multiple mode control signals sent to the static var generator according to the three-phase reference current ISVG,abc,k of the static var generator and the reference value received by the static var generator. Corresponding to the difference in the reference value received by SVG, this link can be divided into the following three situations, specifically:
当静止无功发生器接收到的参考值为电流时,When the reference value received by the static var generator is current,
其中,为静止无功发生器对应于模式k的附加模式电流控制信号。in, is the additional mode current control signal of the static var generator corresponding to mode k.
当静止无功发生器接收到的参考值为接入母线电压时,When the reference value received by the static var generator is connected to the bus voltage,
其中,为静止无功发生器对应于模式k的附加模式电压控制信号。in, is the additional mode voltage control signal of the static var generator corresponding to mode k.
当静止无功发生器接收的参考值为无功功率,以吸收感性无功为正方向,则When the reference value received by the static var generator is reactive power, and the absorption of inductive reactive power is the positive direction, then
其中,为静止无功发生器对应于模式k的附加瞬时无功功率模式控制信号,Vabc表示静止无功发生器接入母线的三相电压基波分量。in, is the additional instantaneous reactive power mode control signal of the static var generator corresponding to mode k, and V abc represents the three-phase voltage fundamental component of the static var generator connected to the bus.
S25:对多个模式控制信号进行限幅处理,以使多个模式控制信号的幅值位于第二预设范围内。具体地说,较大的模式控制信号有可能会损坏SVG控制器,因此需要进行模式控制信号限幅处理,其主要目的是把上述计算得到的模式控制信号幅度限定在一定的范围(第二预设范围)内,当输入的模式控制信号高于第二预设范围的上限值或低于第二预设范围的下限值时,输出的模式控制信号将被限制为某一恒定值,且不随输入信号变化,其中,该恒定值位于第二预设范围内。S25: Limiting the multiple mode control signals, so that the amplitudes of the multiple mode control signals are within the second preset range. Specifically, a larger mode control signal may damage the SVG controller, so it is necessary to perform mode control signal limiting processing, the main purpose of which is to limit the amplitude of the mode control signal obtained by the above calculation within a certain range (the second preset Within the set range), when the input mode control signal is higher than the upper limit value of the second preset range or lower than the lower limit value of the second preset range, the output mode control signal will be limited to a certain constant value, And does not vary with the input signal, wherein the constant value is within the second preset range.
在步骤S25中,例如可采用简单的数字式双向限幅器,典型的计算公式如下:In step S25, for example, a simple digital two-way limiter can be used, and a typical calculation formula is as follows:
其中,Xk,in表示模式k中模式限幅环节输入的模式控制信号,对应于静止无功发生器接收的不同参考值,Xk,out表示模式k中限幅环节输出的实际作用于静止无功发生器的模式控制信号,Xk,max、Xk,min分别表示因静止无功发生器或其他制约条件造成的其可接受的最大、最小模式控制信号值,即Xk,max、Xk,min分别表示第二预设范围的上限值和下限值。Among them, X k,in represents the mode control signal input by the mode limiting link in mode k, corresponding to different reference values received by the static var generator, X k,out represents the actual action of the output of the limiting link in mode k on the static The mode control signal of the var generator, X k,max , X k,min represent the acceptable maximum and minimum mode control signal values caused by the static var generator or other constraints, namely X k,max , X k,min represent the upper limit and the lower limit of the second preset range respectively.
步骤S3:对多个模式控制信号进行加和运算,以得到附加控制信号。Step S3: performing a sum operation on multiple mode control signals to obtain an additional control signal.
在本发明的一个实施例中,在步骤S3中,针对各模式控制信号幅值的大小,例如通过对多个模式控制信号进行直接相加(即直接相加法)以得到附加控制信号;或者In one embodiment of the present invention, in step S3, for each mode control signal amplitude, for example, by directly adding multiple mode control signals (that is, direct addition method) to obtain an additional control signal; or
也可以设置多个模式控制信号的权重,并将多个模式控制信号按照权重比例相加,以得到附加控制信号,具体的实现方式为:It is also possible to set the weights of multiple mode control signals, and add the multiple mode control signals according to the weight ratio to obtain additional control signals. The specific implementation method is:
其中,wk为权重因子,直接相加时wk=1,Xk为对应于模式k的模式控制信号,X为所述附加控制信号,N为模式总数。Wherein, w k is a weighting factor, w k =1 when directly added, X k is a mode control signal corresponding to mode k, X is the additional control signal, and N is the total number of modes.
步骤S4:对附加控制信号进行限幅处理,以使附加控制信号的幅值位于第一预设范围内。Step S4: Limiting the additional control signal, so that the amplitude of the additional control signal is within a first preset range.
具体地说,与上述的模式控制信号限幅环节类似,较大的附加控制信号有可能会损坏SVG控制器,因此需要对附加控制信号进行限幅处理,其主要目的是把模式控制信号加和得到的总的附加控制信号的幅值限定在一定的范围(第一预设范围)内,当输入的附加控制信号高于第一预设范围的上限值或低于第一预设范围的下限值时,输出的附加控制信号将被限制为某一恒定值,且不随输入信号的变化而变化,其中,该恒定值位于第一预设范围内。Specifically, similar to the mode control signal clipping link above, a larger additional control signal may damage the SVG controller, so it is necessary to limit the additional control signal, the main purpose of which is to sum the mode control signal The amplitude of the obtained total additional control signal is limited within a certain range (the first preset range), when the input additional control signal is higher than the upper limit of the first preset range or lower than the first preset range When the lower limit value is reached, the output additional control signal will be limited to a certain constant value, which will not change with the change of the input signal, wherein the constant value is within the first preset range.
在具体示例中,对附加控制信号进行限幅处理例如可通过简单的数字式双向限幅器实现,典型的计算公式如下:In a specific example, the limit processing of the additional control signal can be realized by, for example, a simple digital two-way limiter, and a typical calculation formula is as follows:
其中,Xin表示附加控制信号限幅环节输入的附加控制信号,对应于静止无功发生器接收的不同参考值,Xout表示附加控制信号限幅环节输出的实际作用于静止无功发生器的附加控制信号,Xmax、Xmin分别表示因静止无功发生器或其他制约条件造成的其可接受的最大、最小附加控制信号值,即Xmax、Xmin分别表示第以预设范围的上限值和下限值。Among them, X in represents the additional control signal input by the additional control signal limiting link, corresponding to different reference values received by the static var generator, and X out represents the actual output of the additional control signal limiting link acting on the static var generator Additional control signal, X max , X min represent the acceptable maximum and minimum additional control signal values caused by the static var generator or other constraints, that is, X max , X min represent the upper and lower values of the preset range respectively Limits and Lower Limits.
需要说的是,以上示例中的信号处理是在abc三相坐标中进行的,也可以将信号先做正向Park变换,得到dq坐标系的量,然后对应进行计算,得到dq坐标系下的控制量,如果静止无功发生器的控制接口是定义在dq坐标系下的,则可直接输出到该控制接口;而如果静止无功发生器的控制接口是定义在abc坐标系下的,则通过反向Park变换,得到abc坐标下的控制信号。What needs to be said is that the signal processing in the above example is carried out in the abc three-phase coordinates, and the signal can also be forward Park transformed first to obtain the amount of the dq coordinate system, and then correspondingly calculated to obtain the value in the dq coordinate system Control quantity, 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, then Through the inverse Park transformation, the control signal under the abc coordinates is obtained.
综上,本发明上述实施例多模式附加次/超同步振荡控制方法,其原理简单,可根据系统特性自动调节SVG的控制信号,达到抑制次/超同步振荡的目的。该方法的整个环节包括信号采集与转换、滤波、限幅等,均可以由简单电路实现,整个结构简单,易于工程实现,而且可以采用模块化结构,安装调试灵活方便,且易于扩展。进一步地,该方法对次/超同步振荡的信号处理采用分模式独立控制通道结构,有利于对于各个模式进行相对独立设计,减轻模式之间的干扰,可望实现对多模式更精细和高效的控制,适用于系统振荡模式多于一个且模式间相互影响而不能采用采用一致增益和移相环节的情况。To sum up, the multi-mode additional sub/supersynchronous oscillation control method of the above embodiment of the present invention has a simple principle and can automatically adjust the SVG control signal according to system characteristics to achieve the purpose of suppressing sub/supersynchronous oscillation. The entire link of the method, including signal acquisition and conversion, filtering, limiting, etc., can be realized by a simple circuit, the whole structure is simple, easy to implement in engineering, and can adopt a modular structure, flexible and convenient to install and debug, and easy to expand. Furthermore, this method adopts a sub-mode independent control channel structure for the signal processing of sub/supersynchronous oscillation, which is conducive to relatively independent design for each mode and reduces the interference between modes, which is expected to achieve more refined and efficient multi-mode Control is suitable for the situation where there are more than one system oscillation mode and the modes affect each other, and the uniform gain and phase shifting link cannot be used.
根据本发明实施例的多模式附加次/超同步振荡控制方法,实时采集风机侧或者线路侧的总电流,计算出附加控制信号,通过控制静止无功发生器,在振荡发生的次/超同步频率处,将静止无功发生器等效为并联在母线处的感性阻抗,破坏系统振荡发生的条件,从而有效抑制风电场接入时系统的次/超同步振荡。According to the multi-mode additional sub/supersynchronous 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. By controlling the static var generator, the sub/supersynchronous At the frequency, the static var generator is equivalent to the inductive impedance connected in parallel at the busbar, which destroys the conditions for the system oscillation to effectively suppress the sub/super synchronous oscillation of the system when the wind farm is connected.
本发明的进一步实施例还提出了一种多模式附加次/超同步振荡控制系统。A further embodiment of the present invention also proposes a multi-mode additive sub/supersynchronous oscillation control system.
图4是根据本发明一个实施例的多模式附加次/超同步振荡控制系统的结构框图。如图4所示,该系统100包括:信号采集与转换模块110、附加控制模块120、模式控制信号加和模块130和附加控制信号限幅模块140。FIG. 4 is a structural block diagram of a multi-mode additional sub/supersynchronous oscillation control system according to an embodiment of the present invention. As shown in FIG. 4 , the system 100 includes: a signal acquisition and conversion module 110 , an additional control module 120 , a mode control signal addition module 130 and an additional control signal limiting module 140 .
具体地,信号采集与转换模块110用于实时采集风机侧的总三相电流ic或者线路侧的总三相电流iL,并转化为相应的数字信号。Specifically, the signal collection and conversion module 110 is used to collect the total three-phase current ic at the fan side or the total three-phase current i L at the line side in real time, and convert them into corresponding digital signals.
附加控制模块120用于根据风机侧的总三相电流ic或者线路侧的总三相电流iL计算得到多个模式控制信号。The additional control module 120 is used to calculate and obtain multiple mode control signals according to the total three-phase current i c at the fan side or the total three-phase current i L at the line side.
进一步地,如图5所示,附加控制模块120包括:滤波模块121、比例/移相模块122、参考电流计算模块123、模式控制信号计算模块124和模式控制信号限幅模块125。Further, as shown in FIG. 5 , the additional control module 120 includes: a filter module 121 , a ratio/phase shift module 122 , a reference current calculation module 123 , a mode control signal calculation module 124 and a mode control signal limiter module 125 .
其中,滤波模块121用于对风机侧的总三相电流ic或者线路侧的总三相电流iL进行滤波,滤出次同步和超同步谐波分量。更为具体地,滤波模块121用于:通过带通滤波器得到次同步和超同步谐波分量;和/或通过将带通滤波器与带阻滤波器或低通/高通滤波器串联的方式滤除风机侧的总三相电流ic或者线路侧的总三相电流iL的基波分量,并得到次同步和超同步谐波分量。Wherein, the filter module 121 is used to filter the total three-phase current i c at the fan side or the total three-phase current i L at the line side, and filter out sub-synchronous and super-synchronous harmonic components. More specifically, the filter module 121 is used to: obtain sub-synchronous and super-synchronous harmonic components through a band-pass filter; and/or connect the band-pass filter with a band-stop filter or a low-pass/high-pass filter Filter out the fundamental component of the total three-phase current i c on the fan side or the total three-phase current i L on the line side, and obtain sub-synchronous and super-synchronous harmonic components.
比例/移相模块122用于对测量、滤波器和静止无功发生器产生的相位延迟进行补偿,和/或进行预定的相位偏移和幅值补偿。The scaling/phase shifting module 122 is used to compensate for phase delays generated by measurements, filters and static var generators, and/or perform predetermined phase offset and amplitude compensation.
参考电流计算模块123用于将经相位补偿和/或偏移后的电流信号转化为静止无功发生器的三相参考电流ISVG,abc,k,具体包括:The reference current calculation module 123 is used to convert the phase-compensated and/or shifted current signal into the three-phase reference current I SVG,abc,k of the static var generator, specifically including:
当采集的信号为风机侧的总三相电流ic时,When the collected signal is the total three-phase current ic on the fan side,
当采集的信号为线路侧的总三相电流iL时,When the collected signal is the total three-phase current i L on the line side,
其中,IL,abc,k(s)和Ic,abc,k(s)分别表示模式k中经前述信号处理后的线路侧和风机侧的a,b,c三相电流,k=1,…,N,N为被控制的模式总数目,ISVG,abc,k(s)表示模式k中计算出的静止无功发生器的三相参考电流的a,b,c三相值,RL、LL分别表示线路侧的等效电阻和电感,RSVG,k、LSVG,k为控制参数,分别表示模式k中可设定的静止无功发生器的附加等效电阻和电感。Among them, I L, abc, k (s) and I c, abc, k (s) respectively represent the a, b, c three-phase currents of the line side and the fan side after the aforementioned signal processing in mode k, k=1 ,...,N, N is the total number of modes to be controlled, I SVG,abc,k (s) represents the a,b,c three-phase values of the three-phase reference current of the static var generator calculated in mode k, R L , L L respectively represent the equivalent resistance and inductance of the line side, R SVG,k , L SVG,k are control parameters, respectively represent the additional equivalent resistance and inductance of the static var generator that can be set in mode k .
模式控制信号计算模块124用于根据静止无功发生器的三相参考电流ISVG,abc,k和静止无功发生器接收到的参考值计算发送给静止无功发生器的多个模式控制信号。更为具体地,模式控制信号计算模块124用于:当静止无功发生器接收到的参考值为电流时,The mode control signal calculation module 124 is used to calculate a plurality of mode control signals sent to the static var generator according to the three-phase reference current ISVG, abc, k of the static var generator and the reference value received by the static var generator . More specifically, the mode control signal calculation module 124 is used for: when the reference value received by the static var generator is current,
其中,为静止无功发生器对应于模式k的附加模式电流控制信号;in, is the additional mode current control signal of the static var generator corresponding to mode k;
当静止无功发生器接收到的参考值为接入母线电压时,When the reference value received by the static var generator is connected to the bus voltage,
其中,为静止无功发生器对应于模式k的附加模式电压控制信号;in, is the additional mode voltage control signal corresponding to mode k of the static var generator;
当静止无功发生器接收的参考值为无功功率,When the reference value received by the static var generator is reactive power,
其中,为静止无功发生器对应于模式k的附加瞬时无功功率模式控制信号,Vabc表示静止无功发生器接入母线的三相电压基波分量。in, is the additional instantaneous reactive power mode control signal of the static var generator corresponding to mode k, and V abc represents the three-phase voltage fundamental component of the static var generator connected to the bus.
模式控制信号限幅模块125用于对多个模式控制信号进行限幅处理,以使多个模式控制信号的幅值位于第二预设范围内。The mode control signal limiting module 125 is used for limiting the multiple mode control signals, so that the amplitudes of the multiple mode control signals are within the second preset range.
模式控制信号加和模块130用于对多个模式控制信号进行加和运算,以得到附加控制信号。The mode control signal summing module 130 is used for summing multiple mode control signals to obtain additional control signals.
具体地,模式控制信号加和模块130例如用于:将多个模式控制信号直接相加以得到附加控制信号;或者设置多个模式控制信号的权重,并将多个模式控制信号按照权重比例相加,以得到附加控制信号,具体包括:Specifically, the mode control signal addition module 130 is used, for example, to: directly add multiple mode control signals to obtain an additional control signal; or set the weight of multiple mode control signals, and add the multiple mode control signals according to the weight ratio , to get additional control signals, including:
其中,wk为权重因子,直接相加时wk=1,Xk为对应于模式k的模式控制信号,X为附加控制信号,N为模式总数。Wherein, w k is a weighting factor, w k =1 when adding directly, X k is a mode control signal corresponding to mode k, X is an additional control signal, and N is the total number of modes.
附加控制信号限幅模块140用于对附加控制信号进行限幅处理,以使附加控制信号的幅值位于第一预设范围内。The additional control signal limiting module 140 is configured to limit the additional control signal, so that the amplitude of the additional control signal is within a first preset range.
需要说明的是,本发明实施例的多模式附加次/超同步振荡控制系统的具体实现方式与本发明实施例的多模式附加次/超同步振荡控制方法的具体实现方式类似,具体请参见方法部分的描述,为了减少冗余,不做赘述。It should be noted that the specific implementation of the multi-mode additional sub/supersynchronous oscillation control system in the embodiment of the present invention is similar to the specific implementation of the multi-mode additional sub/supersynchronous oscillation control method in the embodiment of the present invention, please refer to the method for details. Part of the description, in order to reduce redundancy, will not be repeated.
另外,本发明实施例的多模式附加次/超同步振荡控制系统的其它构成以及作用对于本领域的技术人员而言都是已知的,为了减少冗余,不做赘述。In addition, other configurations and functions of the multi-mode additional sub/supersynchronous oscillation control system of the embodiment of the present invention are known to those skilled in the art, and will not be repeated in order to reduce redundancy.
综上,根据本发明实施例的多模式附加次/超同步振荡控制系统,实时采集风机侧或者线路侧的总电流,计算出附加控制信号,通过控制静止无功发生器,在振荡发生的次/超同步频率处,将静止无功发生器等效为并联在母线处的感性阻抗,破坏系统振荡发生的条件,从而有效抑制风电场接入时系统的次/超同步振荡。In summary, according to the multi-mode additional secondary/supersynchronous 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. By controlling the static var generator, the secondary At the /supersynchronous frequency, the static var generator is equivalent to the inductive impedance connected in parallel at the busbar, which destroys the conditions for the system oscillation to effectively suppress the sub/supersynchronous oscillation of the system when the wind farm is connected.
在本说明书的描述中,参考术语“一个实施例”、“一些实施例”、“示例”、“具体示例”、或“一些示例”等的描述意指结合该实施例或示例描述的具体特征、结构、材料或者特点包含于本发明的至少一个实施例或示例中。在本说明书中,对上述术语的示意性表述不一定指的是相同的实施例或示例。而且,描述的具体特征、结构、材料或者特点可以在任何的一个或多个实施例或示例中以合适的方式结合。In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic 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 specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
尽管已经示出和描述了本发明的实施例,本领域的普通技术人员可以理解:在不脱离本发明的原理和宗旨的情况下可以对这些实施例进行多种变化、修改、替换和变型,本发明的范围由权利要求及其等同限定。Although the embodiments of the present invention have been shown and described, those skilled in the art can understand that various changes, modifications, substitutions and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the invention is defined by the claims and their equivalents.
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