JP2019176715A - Method for suppressing voltage fluctuation in common connection point at electric power plant and apparatus - Google Patents
Method for suppressing voltage fluctuation in common connection point at electric power plant and apparatus Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
Description
本発明は、発電システムの技術分野に関し、特に、発電所の共通接続点の電圧変動を抑制する方法及び装置に関する。 The present invention relates to the technical field of power generation systems, and more particularly to a method and apparatus for suppressing voltage fluctuations at a common connection point of a power plant.
従来技術では、発電所の共通接続点の電圧変動を抑制するために、一般的に、無効電力の補償によって電圧変動の抑制を実現し、具体的には、無効電力による有効電力の電圧変動を線形補償する。 In the prior art, in order to suppress the voltage fluctuation at the common connection point of the power plant, in general, the suppression of the voltage fluctuation is realized by compensating the reactive power. Specifically, the voltage fluctuation of the active power due to the reactive power is reduced. Linear compensation.
しかしながら、電力網インピーダンスが大きい弱い網の場合に、無効電力による有効電力の電圧変動は非線形であるため、上記の方式は、発電所の共通接続点の電圧変動に対して抑制效果が限られ、電圧変動を根本的に完全に抑制することができず、発電所の共通接続点に電力変動がある場合に、電圧に依然として一定の変動がある。 However, in the case of a weak network with a large power grid impedance, the active power voltage fluctuation due to reactive power is non-linear. Therefore, the above method has a limited effect on the voltage fluctuation at the common connection point of the power plant, and the voltage If the fluctuation cannot be fundamentally completely suppressed and there is a power fluctuation at the common connection point of the power plant, there is still a certain fluctuation in the voltage.
本発明は、従来技術における弱い網の場合に抑制效果が限られる問題を解決するために、発電所の共通接続点の電圧変動の方法及び装置を提供する。 The present invention provides a voltage fluctuation method and apparatus at a common connection point of a power plant in order to solve the problem that the suppression effect is limited in the case of a weak network in the prior art.
上記の目的を達成するために、本出願によって提供される技術的方案は以下のようである。 In order to achieve the above object, the technical solution provided by the present application is as follows.
発電所の共通接続点の電圧変動を抑制する方法であって、
予め設定された条件を満たす場合に、有効電力の変化前後の発電所の共通接続点の電圧及び電流を取得することと、
有効電力の変化前後の発電所の共通接続点の電圧及び電流に基づいて、電力網インピーダンスを算出することと、
前記電力網インピーダンスとリアルタイムで取得する発電所の共通接続点の電圧と有効電力との関係に基づいて、無効電力補償係数を算出することと、
前記無効電力補償係数に基づいて、発電所の出力する必要がある無効電力を算出して発電所内の各インバータに発行することとを含む。
A method for suppressing voltage fluctuations at a common connection point of a power plant,
Obtaining the voltage and current of the common connection point of the power plant before and after the change of the active power when satisfying a preset condition;
Calculating the power grid impedance based on the voltage and current at the common connection point of the power plant before and after the change in active power;
Calculating a reactive power compensation coefficient based on the relationship between the power grid impedance and the voltage of the common connection point of the power plant acquired in real time and the active power;
Calculating reactive power that needs to be output from the power plant based on the reactive power compensation coefficient, and issuing the reactive power to each inverter in the power plant.
好ましくは、前記した予め設定された条件を満たす場合に有効電力の変化前後の発電所の共通接続点の電圧及び電流を取得することは、
予め設定された時間内の２つの時点における発電所の共通接続点の有効電力差分が第１の閾値よりも大きいと、前記予め設定された時間内の２つの時点における発電所の共通接続点の電圧をそれぞれ前記有効電力の変化前後の発電所の共通接続点の電圧とし、前記予め設定された時間内の２つの時点における発電所の共通接続点の電流をそれぞれ前記有効電力の変化前後の発電所の共通接続点の電流とし、
又は、発電所の共通接続点の有効電力が第２の閾値よりも大きい場合、制限コマンドを発電所内の各インバータに発行して、発電所の共通接続点の有効電力の変化差分を前記第１の閾値よりも大きくし、取得した入力情報に基づいて、前記有効電力の変化前後の発電所の共通接続点の電圧及び電流を取得することとを含む。
Preferably, obtaining the voltage and current of the common connection point of the power plant before and after the change of the active power when the above-described preset condition is satisfied,
If the active power difference of the power plant common connection point at two time points within a preset time is greater than the first threshold, the power plant common connection point at two time points within the preset time The voltage is the voltage at the common connection point of the power plant before and after the change of the active power, and the current at the common connection point of the power plant at two time points within the preset time is the power generation before and after the change of the active power. Current at the common connection point
Alternatively, when the active power at the common connection point of the power plant is larger than the second threshold value, a limit command is issued to each inverter in the power plant, and the change difference in the active power at the common connection point of the power plant is calculated. And acquiring the voltage and current at the common connection point of the power plant before and after the change of the active power based on the acquired input information.
好ましくは、前記した有効電力の変化前後の発電所の共通接続点の電圧及び電流に基づいて、電力網インピーダンスを算出することは、
Ｖp1=Ｖd1+ｊＶq1、Ｖp2=Ｖd2+ｊＶq2、Ｉp1=Ｉd1+ｊＩq1、Ｉp2=Ｉd2+ｊＩq2及びα=[(Ｖd1．Ｖd2)×(Ｉd1-Ｉd2)+(Ｖq1-Ｖq2)×(Ｉq1-Ｉq2)]÷[(Ｖq1-Ｖq2)×(Ｉd1-Ｉd2)-(Ｖd1-Ｖd2)×(Ｉq1-Ｉq2)]に基づいて、電力網インピーダンス角αを算出することと、
ｒ=α×(Ｖd1-Ｖd2) ÷[α×(Ｉd1-Ｉd2)-(Ｉq1-Ｉq2)]に基づいて、電力網インピーダンスｒを算出することと、
ｘ=(Ｖd1-Ｖd2) ÷[α×(Ｉd1-Ｉd2)- (Ｉq1-Ｉq2)]に基づいて、電力網インピーダンスｘを算出することと、を含み、
なお、Ｖp1は有効電力の変化前の発電所共通接続点の電圧であり、Ｖp2は有効電力の変化後の発電所の共通接続点の電圧であり、Ｉp1は有効電力の変化前の発電所の共通接続点の電流であり、Ｉp2は有効電力の変化後の発電所の共通接続点の電流である。
Preferably, calculating the power grid impedance based on the voltage and current of the common connection point of the power plant before and after the change of the active power described above,
V p1 = V d1 + jV q1 , V p2 = V d2 + jV q2 , I p1 = I d1 + jI q1 , I p2 = I d2 + jI q2 and α = [(V d1 .V d2 ) × (I d1 −I d2 ) + (V q1 −V q2 ) × (I q1 −I q2 )] ÷ [(V q1 −V q2 ) × (I d1 −I d2 ) − (V d1 −V d2 ) × (I q1 -I q2 )] to calculate the power grid impedance angle α;
r = α × (V d1 −V d2 ) ÷ [α × (I d1 −I d2 ) − (I q1 −I q2 )]
calculating power grid impedance x based on x = (V d1 −V d2 ) ÷ [α × (I d1 −I d2 ) − (I q1 −I q2 )],
V p1 is the voltage at the common connection point of the power plant before the change in active power, V p2 is the voltage at the common connection point of the power plant after the change in active power, and I p1 is the voltage before the change in active power. The current at the common connection point of the power plant, and I p2 is the current at the common connection point of the power plant after the change of the active power.
好ましくは、前記した前記電力網インピーダンスとリアルタイムで取得する発電所の共通接続点の電圧と有効電力との関係に基づいて無効電力補償係数を算出することは、
及び
に基づいて、無効電力補償係数Ｋを算出することを含み、
なお、ｒとｘは前記電力網インピーダンスであり、Ｐはリアルタイムで取得する発電所の共通接続点の有効電力であり、ＶPはリアルタイムで取得する発電所の共通接続点の電圧の絶対値である。
Preferably, calculating the reactive power compensation coefficient based on the relationship between the power network impedance and the voltage of the common connection point of the power plant acquired in real time and the active power,
as well as
Calculating a reactive power compensation coefficient K based on
Here, r and x are the power grid impedances, P is the active power at the common connection point of the power plant acquired in real time, and VP is the absolute value of the voltage at the common connection point of the power plant acquired in real time. .
好ましくは、前記した前記無効電力補償係数に基づいて発電所の出力する必要がある無効電力を算出することは、
に基づいて、発電所の出力する必要がある無効電力Ｑを算出することを含み、
なお、Ｋは前記無効電力補償係数であり、Ｐはリアルタイムで取得する発電所の共通接続点の有効電力である。
Preferably, calculating the reactive power that needs to be output from the power plant based on the reactive power compensation coefficient described above,
Calculating reactive power Q that needs to be output from the power plant based on
Here, K is the reactive power compensation coefficient, and P is the active power at the common connection point of the power plants acquired in real time.
発電所の共通接続点の電圧変動を抑制する装置であって、
予め設定された条件を満たす場合に、有効電力の変化前後の発電所の共通接続点の電圧及び電流を取得するための取得ユニットと、
有効電力の変化前後の発電所の共通接続点の電圧及び電流に基づいて、電力網インピーダンスを算出するための第１の算出ユニットと、
前記電力網インピーダンスとリアルタイムで取得する発電所の共通接続点の電圧と有効電力との関係に基づいて、無効電力補償係数を算出するための第２の算出ユニットと、
前記無効電力補償係数に基づいて、発電所の出力する必要がある無効電力を算出するための第３の算出ユニットと、
前記発電所の出力する必要がある無効電力を発電所内の各インバータに発行するための発行ユニットとを含む。
A device for suppressing voltage fluctuation at a common connection point of a power plant,
An acquisition unit for acquiring the voltage and current of the common connection point of the power plant before and after the change of the active power when the preset condition is satisfied;
A first calculation unit for calculating the power grid impedance based on the voltage and current of the common connection point of the power plant before and after the change of the active power;
A second calculation unit for calculating a reactive power compensation coefficient based on the relationship between the power grid impedance and the voltage of the common connection point of the power plant acquired in real time and the active power;
A third calculation unit for calculating the reactive power that needs to be output from the power plant based on the reactive power compensation coefficient;
And an issuing unit for issuing reactive power that needs to be output from the power plant to each inverter in the power plant.
好ましくは、前記取得ユニットは、
予め設定された時間内の２つの時点における発電所の共通接続点の有効電力差分が第１の閾値よりも大きい場合、前記予め設定された時間内の２つの時点における発電所の共通接続点の電圧をそれぞれ前記有効電力の変化前後の発電所の共通接続点の電圧とし、前記予め設定された時間内の２つの時点における発電所の共通接続点の電流をそれぞれ前記有効電力の変化前後の発電所の共通接続点の電流とするための自動取得ユニットと、
発電所の共通接続点の有効電力が第２の閾値よりも大きい場合、前記発行ユニットが制限コマンドを発電所内の各インバータに発行することによって、発電所の共通接続点の有効電力の変化差分を前記第１の閾値よりも大きくし、取得した入力情報に基づいて前記有効電力の変化前後の発電所の共通接続点の電圧及び電流を取得するための手動取得ユニットとを含む。
Preferably, the acquisition unit is
If the active power difference at the power plant common connection point at two time points within the preset time is greater than the first threshold, the power plant common connection point at the two time points within the preset time The voltage is the voltage at the common connection point of the power plant before and after the change of the active power, and the current at the common connection point of the power plant at two time points within the preset time is the power generation before and after the change of the active power. An automatic acquisition unit for the current at the common connection point
When the active power at the common connection point of the power plant is larger than the second threshold, the issuing unit issues a limit command to each inverter in the power plant, so that the difference in change in the active power at the common connection point of the power plant is obtained. A manual acquisition unit configured to acquire a voltage and a current at a common connection point of the power plant before and after the change of the active power based on the acquired input information.
好ましくは、前記第１の算出ユニットは、
Ｖp1=Ｖd1+ｊＶq1、Ｖp2=Ｖd2+ｊＶq2、Ｉp1=Ｉd1+ｊＩq1、Ｉp2=Ｉd2+ｊＩq2及びα=[(Ｖd1-Ｖd2)×(Ｉd1-Ｉd2)+(Ｖq1-Ｖq2)×(Ｉq1-Ｉq2)]÷[(Ｖq1-Ｖq2)×(Ｉd1-Ｉd2)-(Ｖd1-Ｖd2)×(Ｉq1-Ｉq2)]に基づいて、電力網インピーダンス角αを算出するための第１のサブ算出ユニットと、
ｒ=α×(Ｖd1-Ｖd2) ÷[α×(Ｉd1-Ｉd2)- (Ｉq1-Ｉq2)]に基づいて、電力網インピーダンスｒを算出するための第２のサブ算出ユニットと、
ｘ=(Ｖd1-Ｖd2) ÷[α×(Ｉd1-Ｉd2)- (Ｉq1-Ｉq2)]に基づいて、電力網インピーダンスｘを算出するための第３のサブ算出ユニットと、を含み、
なお、Ｖp1は有効電力の変化前の発電所の共通接続点の電圧であり、Ｖp2は有効電力の変化後の発電所の共通接続点の電圧であり、Ｉp1は有効電力の変化前の発電所の共通接続点の電流であり、Ｉp2は有効電力の変化後の発電所の共通接続点の電流である。
Preferably, the first calculation unit is
V p1 = V d1 + jV q1 , V p2 = V d2 + jV q2 , I p1 = I d1 + jI q1 , I p2 = I d2 + jI q2 and α = [(V d1 −V d2 ) × (I d1 −I d2 ) + (V q1 −V q2 ) × (I q1 −I q2 )] ÷ [(V q1 −V q2 ) × (I d1 −I d2 ) − (V d1 −V d2 ) × (I q1 -I q2 )], a first sub-calculation unit for calculating the power grid impedance angle α;
Based on r = α × (V d1 −V d2 ) ÷ [α × (I d1 −I d2 ) − (I q1 −I q2 )], a second sub-calculation unit for calculating the power grid impedance r ,
a third sub-calculation unit for calculating the power grid impedance x based on x = (V d1 -V d2 ) ÷ [α × (I d1 -I d2 )-(I q1 -I q2 )] Including
V p1 is the voltage at the common connection point of the power plant before the change in active power, V p2 is the voltage at the common connection point of the power plant after the change in active power, and I p1 is the voltage before the change in active power. I p2 is the current at the common connection point of the power plant after the change in active power.
好ましくは、前記第２の算出ユニットが前記電力網インピーダンスとリアルタイムで取得する発電所の共通接続点の電圧と有効電力との関係に基づいて無効電力補償係数を算出する際に、具体的に、
及び
に基づいて、無効電力補償係数Ｋを算出し、
なお、ｒとｘは前記電力網インピーダンスであり、Ｐはリアルタイムで取得する発電所の共通接続点の有効電力であり、ＶPはリアルタイムで取得する発電所の共通接続点の電圧の絶対値である。
Preferably, when calculating the reactive power compensation coefficient based on the relationship between the power grid impedance and the voltage of the common connection point of the power plant acquired in real time and the active power, the second calculation unit specifically,
as well as
Based on the above, the reactive power compensation coefficient K is calculated,
Here, r and x are the power grid impedances, P is the active power at the common connection point of the power plant acquired in real time, and VP is the absolute value of the voltage at the common connection point of the power plant acquired in real time. .
好ましくは、前記第３の算出ユニットが前記無効電力補償係数に基づいて発電所の出力する必要がある無効電力を算出する際に、具体的に、
に基づいて、発電所の出力する必要がある無効電力Ｑを算出し、
なお、Ｋは前記無効電力補償係数であり、Ｐはリアルタイムで取得する発電所の共通接続点の有効電力である。
Preferably, when calculating the reactive power that the third calculation unit needs to output from the power plant based on the reactive power compensation coefficient, specifically,
Based on the above, the reactive power Q that needs to be output from the power plant is calculated,
Here, K is the reactive power compensation coefficient, and P is the active power at the common connection point of the power plants acquired in real time.
本発明によって提供される発電所の共通接続点の電圧変動を抑制する方法は、まず、予め設定された条件を満たす場合に、有効電力の変化前後の発電所の共通接続点の電圧及び電流を取得し、その後、有効電力の変化前後の発電所の共通接続点の電圧及び電流に基づいて、電力網インピーダンスを算出し、さらに、前記電力網インピーダンスとリアルタイムで取得する発電所の共通接続点の電圧と有効電力との関係に基づいて、無効電力補償係数を算出し、最後に、前記無効電力補償係数に基づいて、発電所の出力する必要がある無効電力を算出して発電所内の各インバータに発行し、電力網インピーダンスが大きい弱い網に適用される場合であっても、電圧変動を抑制するための無効電力補償係数は、電力網インピーダンスとリアルタイムで取得する発電所の共通接続点の電圧と有効電力との関係に基づいて算出されるものであり、即ち、本出願の無効電力係数の算出は、適用される電力網インピーダンスに直接関係して、電圧変動を根本的に抑制することができ、従来技術における問題が解決される。 The method for suppressing the voltage fluctuation at the common connection point of the power plant provided by the present invention is to first calculate the voltage and current at the common connection point of the power plant before and after the change of the active power when the preset condition is satisfied. And then calculating the power grid impedance based on the voltage and current of the common connection point of the power plant before and after the change of the active power, and further, the power network impedance and the voltage of the common connection point of the power plant acquired in real time Reactive power compensation coefficient is calculated based on the relationship with active power, and finally, reactive power that needs to be output from the power plant is calculated based on the reactive power compensation coefficient and issued to each inverter in the power plant. Even when applied to a weak network with large power grid impedance, the reactive power compensation coefficient for suppressing voltage fluctuation is It is calculated based on the relationship between the voltage at the common connection point of the power plant to be acquired and the active power, i.e., the calculation of the reactive power coefficient in this application is directly related to the power grid impedance to be applied. The fluctuation can be fundamentally suppressed, and the problems in the prior art are solved.
本発明の実施例又は従来技術の技術的方案をより明確に説明するために、以下、実施例や従来技術の説明に用いられる図面について簡単に説明する。明らかに、以下の説明における図面は、本発明のいくつかの実施例に過ぎない。当業者であれば、これらの図面に基づいて創造的な作業を行うことなく他の図面を得ることもできる。 In order to more clearly describe the embodiments of the present invention or the technical solutions of the prior art, the drawings used for explaining the embodiments and the prior art will be briefly described below. Apparently, the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can obtain other drawings based on these drawings without performing creative work.
以下、本出願の実施例における技術的方案について、本出願の実施例における添付図面を参照しながら、明確かつ完全に説明する。記載される実施例は本出願の実施例の一部に過ぎず、全ての実施例ではないことは明らかである。本出願の実施例に基づいて当業者によって創作努力をすることなく得られる他の全ての実施例は、いずれも本出願の保護範囲内に属する。 Hereinafter, the technical solutions in the embodiments of the present application will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present application. It will be appreciated that the embodiments described are only part of the embodiments of the present application and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without making any creative efforts shall fall within the protection scope of the present application.
本発明は、従来技術における弱い網の場合に抑制效果が限られる問題を解決するために、発電所の共通接続点の電圧変動を抑制する方法を提供する。 The present invention provides a method for suppressing voltage fluctuation at a common connection point of a power plant in order to solve the problem that the suppression effect is limited in the case of a weak network in the prior art.
当該発電所の共通接続点の電圧変動を抑制する方法は、図１に示す発電所システム構成に適用され、その中、ＰＣＣは発電所の共通接続点であり、Ｖpは発電所の共通接続点の電圧の絶対値であり、Ｉpは発電所の共通接続点の電流であり、ｒとｘは電力網インピーダンスであり、Ｖsは電力網の電圧である。 The method of suppressing the voltage fluctuation at the common connection point of the power plant is applied to the power plant system configuration shown in FIG. 1, in which PCC is the common connection point of the power plant and V p is the common connection of the power plant. The absolute value of the voltage at the point, I p is the current at the common connection point of the power plant, r and x are the power grid impedance, and V s is the voltage of the power grid.
具体的に、当該発電所の共通接続点の電圧変動を抑制する方法は図２に示すように、以下のステップを含む。 Specifically, as shown in FIG. 2, the method for suppressing the voltage fluctuation at the common connection point of the power plant includes the following steps.
Ｓ１０１は、予め設定された条件を満たす場合に、有効電力の変化前後の発電所の共通接続点の電圧及び電流を取得する。 S101 acquires the voltage and current of the common connection point of the power plant before and after the change of the active power when the preset condition is satisfied.
電力網インピーダンスの計算結果の正確性を保証するために、適切なサンプリング時点を選択する必要があり、具体的な実際の適用では、このサンプリング処理を自動検出モード又は手動トリガーモードによって実現することができる。 In order to ensure the accuracy of the power grid impedance calculation result, it is necessary to select an appropriate sampling time point, and in a specific practical application, this sampling process can be realized by the automatic detection mode or the manual trigger mode. .
自動検出モードでは、予め設定された時間（例えば、１０ｍｉｎ）内の２つの時点（図３に示すｔ１時点とｔ２時点であり、ｔ１時点とｔ２時点との間の時間間隔Ｔが１０ｍｉｎよりも小さい）における発電所の共通接続点の有効電力差分ａｂｓ（Ｐ１-Ｐ２）が第１の閾値（例えば、０．１Ｐｎであり、Ｐｎは発電所の定格電力である）よりも大きい場合、当該予め設定された時間内の２つの時点（即ち、ｔ１時点とｔ２時点）における発電所の共通接続点の電圧をそれぞれ、有効電力の変化の前後の発電所の共通接続点の電圧として、当該予め設定された時間内の２つの時点（即ち、ｔ１時点とｔ２時点）における発電所の共通接続点の電流をそれぞれ、有効電力の変化の前後の発電所の共通接続点の電流とする。 In the automatic detection mode, two time points (t1 time point and t2 time point shown in FIG. 3) within a preset time (for example, 10 min), and the time interval T between the t1 time point and the t2 time point is smaller than 10 min. ), If the active power difference abs (P1-P2) at the common connection point of the power plant is larger than a first threshold (for example, 0.1 Pn, where Pn is the rated power of the power plant) The voltage at the common connection point of the power plant at two time points (ie, the time point t1 and the time point t2) within the set time is set in advance as the voltage at the common connection point of the power plant before and after the change of the active power. The current at the common connection point of the power plant at two points in time (that is, the time point t1 and the time point t2) is the current at the common connection point of the power plant before and after the change of the active power.
手動トリガーモードでは、発電所の共通接続点の有効電力が第２の閾値（例えば、０．２Ｐｎ）よりも大きい場合、制限コマンドを発電所内の各インバータに発行して、発電所の共通接続点の有効電力の変化差分を第１の閾値（例えば、０．１Ｐｎ）よりも大きくさせる。その後、取得した入力情報に基づいて有効電力の変化前後の発電所の共通接続点の電圧及び電流を取得する。具体的には、発電所の共通接続点の有効電力の変化前後の有効電力が最も安定している時点を選択時点として、電圧及び電流を取得することができる。 In the manual trigger mode, when the active power at the common connection point of the power plant is larger than a second threshold (for example, 0.2 Pn), a limit command is issued to each inverter in the power plant, and the common connection point of the power plant The active power change difference is made larger than a first threshold (for example, 0.1 Pn). Thereafter, the voltage and current of the common connection point of the power plant before and after the change of the active power are acquired based on the acquired input information. Specifically, the voltage and current can be acquired with the time when the active power before and after the change of the active power at the common connection point of the power plant is most stable as the selected time.
具体的な実際の適用では、発電所の共通接続点に設置された変流器によって発電所の共通接続点の電流を取得し、発電所の共通接続点に設置された電圧センサーによって発電所の共通接続点の電圧を取得することができる。 In a specific practical application, the current at the common connection point of the power plant is acquired by a current transformer installed at the common connection point of the power plant, and the power sensor of the power plant is detected by a voltage sensor installed at the common connection point of the power plant. The voltage at the common connection point can be acquired.
Ｓ１０２は、有効電力の変化前後の発電所の共通接続点の電圧及び電流に基づいて、電力網インピーダンスを算出する。 S102 calculates the power grid impedance based on the voltage and current at the common connection point of the power plant before and after the change of the active power.
図１から分かるように、Ｖp=Ｉp×Ｚ+Ｖｓであり、その中、Ｖp=Ｖd+ｊＶq、Ｉp=Ｉd+ｊＩq、Ｖｓ=Ｖsd+ｊＶsq、Ｚ=ｒ+ｊｘであり、そのため、Ｖd=ｒ×Ｉd-ｘ×Ｉq +Ｖsd、Ｖq=ｒ×Ｉq+ｘ×Ｉd +Ｖsqである。 As can be seen from FIG. 1, V p = I p × Z + Vs, of which V p = V d + jV q , I p = I d + jI q , Vs = V sd + jV sq , Z = r + jx, and therefore V d = r × I d -x × I q + V sd and V q = r × I q + x × I d + V sq .
図３におけるｔ１時点の電圧Ｖp1=Ｖd1+ｊＶq1と電流Ｉp1=Ｉd1+ｊＩq1、及びｔ２時点の電圧Ｖp2=Ｖd2+ｊＶq2と電流Ｉp2=Ｉd2+ｊＩq2を上記の式にそれぞれ代入すると、Ｖd1=ｒ×Ｉd1-ｘ×Ｉq1+Ｖsd、Ｖq1=ｒ×Ｉq1+ｘ×Ｉd1+Ｖsq、Ｖd2=ｒ×Ｉd2-ｘ×Ｉq2+Ｖsd、Ｖq2=ｒ×Ｉq2+ｘ×Ｉd2 +Ｖsqが得られる。 In FIG. 3, the voltage V p1 = V d1 + jV q1 and current I p1 = I d1 + jI q1 at time t1, and the voltage V p2 = V d2 + jV q2 and current I p2 = I d2 + jI q2 at time t2 Substituting into the above formulas, V d1 = r × I d1 −x × I q1 + V sd , V q1 = r × I q1 + x × I d1 + V sq , V d2 = r × I d2 −xx I q2 + V sd and V q2 = r × I q2 + x × I d2 + V sq are obtained.
さらに、Ｖd1-Ｖd2=ｒ×(Ｉd1-Ｉd2)-ｘ×(Ｉq1-Ｉq2)、Ｖq1-Ｖq2=ｒ×(Ｉq1-Ｉq2)+ｘ×(Ｉd1-Ｉd2)が得られ、また、電力網インピーダンス角α=ｒ/ｘであるので、
α=[(Ｖd1-Ｖd2)×(Ｉd1-Ｉd2)+(Ｖq1-Ｖq2)×(Ｉq1-Ｉq2)]÷[(Ｖq1-Ｖq2)×(Ｉd1-Ｉd2)-(Ｖd1-Ｖd2)×(Ｉq1-Ｉq2)]；
ｒ=α×(Ｖd1-Ｖd2) ÷[α×(Ｉd1-Ｉd2)- (Ｉq1-Ｉq2)]；
ｘ=(Ｖd1-Ｖd2) ÷[α×(Ｉd1-Ｉd2)- (Ｉq1-Ｉq2)]となる。
Furthermore, V d1 −V d2 = r × (I d1 −I d2 ) −x × (I q1 −I q2 ), V q1 −V q2 = r × (I q1 −I q2 ) + xx × (I d1 − I d2 ) and the power grid impedance angle α = r / x,
α = [(V d1 −V d2 ) × (I d1 −I d2 ) + (V q1 −V q2 ) × (I q1 −I q2 )] ÷ [(V q1 −V q2 ) × (I d1 −I d2 )-(V d1 -V d2 ) × (I q1 -I q2 )];
r = α × (V d1 −V d2 ) ÷ [α × (I d1 −I d2 ) − (I q1 −I q2 )];
x = (V d1 −V d2 ) ÷ [α × (I d1 −I d2 ) − (I q1 −I q2 )].
従って、具体的は実際の計算過程では、ｔ１とｔ２時点の電圧及び電流に基づいて、当該電力網インピーダンス角αを算出し、当該電力網インピーダンス角αの具体的な数値と、ｔ１とｔ２時点の電圧及び電流とに基づいて、電力網インピーダンスｒとｘを算出することができる。 Therefore, specifically, in the actual calculation process, the power grid impedance angle α is calculated based on the voltage and current at time t1 and t2, and the specific value of the power network impedance angle α and the voltage at time t1 and t2 are calculated. And the power grid impedances r and x can be calculated based on the current and the current.
Ｓ１０３は、電力網インピーダンスとリアルタイムで取得する発電所の共通接続点の電圧と有効電力との関係に基づいて、無効電力補償係数を算出する。 S103 calculates a reactive power compensation coefficient based on the relationship between the power grid impedance and the voltage of the common connection point of the power plant acquired in real time and the active power.
図１では、発電所の共通接続点の電圧をリアルタイムで取得することができ、発電所の共通接続点の電圧値
と有効電力Ｐ、無効電力Ｑ、電力網インピーダンスｒとｘ及び電力網電圧Ｖｓとの間の関係は、
であり、
従って、発電所の共通接続点の電圧の絶対値の算出式は、
であり、
であるので、
となり、
によって、
が得られる。
In FIG. 1, the voltage at the common connection point of the power plant can be obtained in real time, and the voltage value at the common connection point of the power plant.
And active power P, reactive power Q, power grid impedance r and x, and power grid voltage Vs
And
Therefore, the formula for calculating the absolute value of the voltage at the common connection point of the power plant is
And
So
And
By
Is obtained.
発電所の共通接続点の電圧変動を抑制する方法の目的は、発電所の共通接続点の電圧と電力網の電圧とを一致させることであるので、この時、
であり、これにより、
が得られる。
Since the purpose of the method for suppressing the voltage fluctuation at the common connection point of the power plant is to match the voltage of the common connection point of the power plant with the voltage of the power grid,
And this
Is obtained.
具体的な実際の計算過程では、既知の電力網インピーダンスｒとｘと、リアルタイムで取得する発電所の共通接続点の有効電力Ｐと、リアルタイムで取得する発電所の共通接続点の電圧の絶対値ＶPとに基づいて、上記の式に代入して、無効電力補償係数Ｋを算出することができる。 In a specific actual calculation process, the known power grid impedances r and x, the effective power P of the common connection point of the power plant acquired in real time, and the absolute value V of the voltage of the common connection point of the power plant acquired in real time. Based on P , the reactive power compensation coefficient K can be calculated by substituting into the above formula.
Ｓ１０４は、無効電力補償係数に基づいて、発電所の出力する必要がある無効電力を算出して発電所内の各インバータに発行することができる。 In S104, the reactive power that needs to be output from the power plant can be calculated based on the reactive power compensation coefficient and issued to each inverter in the power plant.
具体的に、
に基づいて、発電所の出力する必要がある無効電力Ｑを算出することができ、当該無効電力Ｑは発電所の共通接続点の電圧と電力網電圧とを一致させることを前提として算出されたものであるので、必然的に、有効電力の変動による発電所の共通接続点の電圧変動を効果的に抑制することができる。図４及び図５に示す実験結果から分かるように、本実施例によって提案される方法によれば、発電所の共通接続点における電力変動による電圧変動を理論的に完全的抑制することができる。
Specifically,
Based on the above, it is possible to calculate the reactive power Q that needs to be output from the power plant, and the reactive power Q is calculated on the assumption that the voltage at the common connection point of the power plant matches the power grid voltage. Therefore, inevitably, voltage fluctuations at the common connection point of the power plant due to fluctuations in active power can be effectively suppressed. As can be seen from the experimental results shown in FIGS. 4 and 5, according to the method proposed by this embodiment, voltage fluctuation due to power fluctuation at the common connection point of the power plant can be theoretically completely suppressed.
当該無効電力Ｑは、全てのインバータが一緒に出力する無効電力であるので、具体的な実際の適用では、平均配分方式又は重み配分方式に従って各インバータの出力する必要がある無効電力を得て、各インバータに発行することができる。ここで具体的に限定せず、具体的な適用環境に応じて決定し、全て本出願の保護範囲内に属する。 Since the reactive power Q is reactive power that all inverters output together, in a specific actual application, obtain the reactive power that each inverter needs to output according to the average distribution method or weight distribution method, Can be issued to each inverter. Here, it is not specifically limited, it is determined according to a specific application environment, and all belong to the protection scope of the present application.
本実施例によって提供される当該発電所の共通接続点の電圧変動を抑制する方法は、電圧変動を抑制するための無効電力補償係数は、電力網インピーダンスとリアルタイムで取得する発電所共通接続点の電圧と有効電力との関係に基づいて算出されたものであり、即ち、本出願の無効電力係数の計算は、適用される電力網インピーダンスに直接関係するので、電力網インピーダンスが大きい弱い網に適用される場合であっても、電圧変動を根本的に抑制することができ、従来技術における弱い網の場合に抑制效果が限られる問題が解決される。 The method for suppressing voltage fluctuation at the common connection point of the power plant provided by this embodiment is that the reactive power compensation coefficient for suppressing voltage fluctuation is the power grid impedance and the voltage at the power plant common connection point acquired in real time. In other words, the calculation of the reactive power coefficient of the present application is directly related to the applied power network impedance, and therefore applied to a weak network having a large power network impedance. Even so, voltage fluctuations can be fundamentally suppressed, and the problem of limited suppression effect is solved in the case of a weak network in the prior art.
本発明の別の実施例は、発電所の共通接続点の電圧変動を抑制する装置をさらに提供し、図６を参照して、取得ユニット１０１、第１の算出ユニット１０２、第２の算出ユニット１０３、第３の算出ユニット１０４及び発行ユニット１０５を含み、その中、
取得ユニット１０１は、予め設定された条件を満たす場合、有効電力の変化前後の発電所の共通接続点の電圧及び電流を取得し、
第１の算出ユニット１０２は、有効電力の変化前後の発電所の共通接続点の電圧及び電流に基づいて、電力網インピーダンスを算出し、
第２の算出ユニット１０３は、電力網インピーダンスとリアルタイムで取得する発電所の共通接続点の電圧と有効電力との関係に基づいて、無効電力補償係数を算出し、
第３の算出ユニット１０４は、無効電力補償係数に基づいて、発電所の出力する必要がある無効電力を算出し、
発行ユニット１０５は、発電所の出力する必要がある無効電力を発電所内の各インバータに発行し、図６における破線は、当該発電所の共通接続点の電圧変動を抑制する装置と各インバータとを接続する通信回線を表す。
Another embodiment of the present invention further provides an apparatus for suppressing voltage fluctuations at a common connection point of a power plant, and referring to FIG. 6, an acquisition unit 101, a first calculation unit 102, a second calculation unit 103, a third calculation unit 104 and an issue unit 105, of which
When the acquisition unit 101 satisfies a preset condition, the acquisition unit 101 acquires the voltage and current of the common connection point of the power plant before and after the change of the active power,
The first calculation unit 102 calculates the power grid impedance based on the voltage and current of the common connection point of the power plant before and after the change of the active power,
The second calculation unit 103 calculates a reactive power compensation coefficient based on the relationship between the power grid impedance and the voltage at the common connection point of the power plant acquired in real time and the active power,
The third calculation unit 104 calculates the reactive power that needs to be output from the power plant based on the reactive power compensation coefficient,
The issuing unit 105 issues reactive power that needs to be output from the power plant to each inverter in the power plant. A broken line in FIG. 6 indicates a device that suppresses voltage fluctuation at the common connection point of the power plant and each inverter. Represents the communication line to be connected.
好ましくは、図７を参照して、取得ユニット１０１は、
予め設定された時間内の２つの時点における発電所の共通接続点の有効電力差分が第１の閾値よりも大きい場合、予め設定された時間内の２つの時点における発電所の共通接続点の電圧をそれぞれ、有効電力の変化前後の発電所の共通接続点の電圧として、予め設定された時間内の２つの時点における発電所の共通接続点の電流をそれぞれ、有効電力の変化前後の発電所の共通接続点の電流とする自動取得ユニット２０１と、
発電所の共通接続点の有効電力が第２の閾値よりも大きい場合、発行ユニット１０５が制限コマンドを発電所内の各インバータに発行することによって、発電所の共通接続点の有効電力の変化差分を第１の閾値よりも大きくし、取得する入力情報に基づいて有効電力の変化前後の発電所の共通接続点の電圧及び電流を取得する手動取得ユニット２０２と、を含む。
Preferably, referring to FIG.
When the active power difference at the common connection point of the power plant at two time points within a preset time is larger than the first threshold, the voltage at the common connection point of the power plant at two time points within the preset time Is the voltage at the common connection point of the power plant before and after the change in active power, and the current at the common connection point of the power plant at two points in time set in advance is An automatic acquisition unit 201 for the current at the common connection point;
When the active power at the common connection point of the power plant is larger than the second threshold value, the issuing unit 105 issues a limit command to each inverter in the power plant, thereby calculating the difference in change in the active power at the common connection point of the power plant. A manual acquisition unit 202 that is larger than the first threshold and acquires the voltage and current of the common connection point of the power plant before and after the change in active power based on the acquired input information.
好ましくは、図７を参照して、第１の算出ユニット１０２は、
Ｖp1=Ｖd1+ｊＶq1、Ｖp2=Ｖd2+ｊＶq2、Ｉp1=Ｉd1+ｊＩq1、Ｉp2=Ｉd2+ｊＩq2及びα=[(Ｖd1-Ｖd2)×(Ｉd1-Ｉd2)+(Ｖq1-Ｖq2)×(Ｉq1-Ｉq2)]÷[(Ｖq1-Ｖq2)×(Ｉd1-Ｉd2)-(Ｖd1-Ｖd2)×(Ｉq1-Ｉq2)]に基づいて電力網インピーダンス角αを算出する第１のサブ算出ユニット３０１と、
ｒ=α×(Ｖd1-Ｖd2) ÷[α×(Ｉd1-Ｉd2)- (Ｉq1-Ｉq2)]に基づいて電力網インピーダンスｒを算出する第２のサブ算出ユニット３０２と、
ｘ=(Ｖd1-Ｖd2) ÷[α×(Ｉd1-Ｉd2)- (Ｉq1-Ｉq2)]に基づいて電力網インピーダンスｘを算出する第３のサブ算出ユニット３０３と、を含み、
その中、Ｖp1は有効電力の変化前の発電所の共通接続点の電圧であり、Ｖp2は有効電力の変化後の発電所の共通接続点の電圧であり、Ｉp1は有効電力の変化前の発電所の共通接続点の電流であり、Ｉp2は有効電力の変化後の発電所の共通接続点の電流である。
Preferably, referring to FIG. 7, the first calculation unit 102
V p1 = V d1 + jV q1 , V p2 = V d2 + jV q2 , I p1 = I d1 + jI q1 , I p2 = I d2 + jI q2 and α = [(V d1 −V d2 ) × (I d1 −I d2 ) + (V q1 −V q2 ) × (I q1 −I q2 )] ÷ [(V q1 −V q2 ) × (I d1 −I d2 ) − (V d1 −V d2 ) × (I q1 -I q2 )], the first sub-calculation unit 301 for calculating the power grid impedance angle α,
a second sub-calculation unit 302 for calculating the power grid impedance r based on r = α × (V d1 −V d2 ) ÷ [α × (I d1 −I d2 ) − (I q1 −I q2 )];
a third sub-calculation unit 303 for calculating the power grid impedance x based on x = (V d1 −V d2 ) ÷ [α × (I d1 −I d2 ) − (I q1 −I q2 )],
Among them, V p1 is the voltage of the common connection point of the power plant before the change of the active power, V p2 is the voltage of the common connection point of the power plant after the change of the active power, and I p1 is the change of the active power. The current at the common connection point of the previous power plant, and I p2 is the current at the common connection point of the power plant after the change in active power.
好ましくは、第２の算出ユニット１０３が電力網インピーダンスとリアルタイムで取得する発電所の共通接続点の電圧と有効電力との関係に基づいて無効電力補償係数を算出する際に、具体的に、
及び
に基づいて、無効電力補償係数Ｋを算出し、
その中、ｒとｘは電力網インピーダンスであり、Ｐはリアルタイムで取得する発電所の共通接続点の有効電力であり、ＶPはリアルタイムで取得する発電所の共通接続点の電圧の絶対値である。
Preferably, when the second calculation unit 103 calculates the reactive power compensation coefficient based on the relationship between the power grid impedance and the voltage at the common connection point of the power plant acquired in real time and the active power, specifically,
as well as
Based on the above, the reactive power compensation coefficient K is calculated,
Among them, r and x are power grid impedances, P is the active power at the common connection point of the power plant acquired in real time, and VP is the absolute value of the voltage at the common connection point of the power plant acquired in real time. .
好ましくは、第３の算出ユニット１０４が無効電力補償係数に基づいて発電所の出力する必要がある無効電力を算出する際に、具体的に、
に基づいて、発電所の出力する必要がある無効電力Ｑを算出し、
その中、Ｋは無効電力補償係数であり、Ｐはリアルタイムで取得する発電所の共通接続点の有効電力である。
Preferably, when the third calculation unit 104 calculates the reactive power that needs to be output from the power plant based on the reactive power compensation coefficient,
Based on the above, the reactive power Q that needs to be output from the power plant is calculated,
Among them, K is a reactive power compensation coefficient, and P is an active power at a common connection point of power plants acquired in real time.
具体的な原理は、前述の実施例と同じであり、ここでの詳細な説明は省略する。 The specific principle is the same as that of the above-described embodiment, and detailed description thereof is omitted here.
本実施例によって提供される当該発電所の共通接続点の電圧変動を抑制する装置は、従来技術における弱い網の場合に抑制效果が限られる問題を解決することができるだけでなく、論理が簡単であり、計算量が小さく、実現が容易である。 The apparatus for suppressing voltage fluctuation at the common connection point of the power plant provided by this embodiment can not only solve the problem of limited suppression effect in the case of a weak network in the prior art, but also has a simple logic. Yes, the amount of calculation is small and easy to implement.
本発明における各実施例は、漸進的に記載されており、各実施例は、主に他の実施例との相違点について説明し、各実施例の間の同じ又は類似の部分について、互いに参照すればよい。実施例に開示された装置は、実施例に開示された方法に対応するため、その説明は比較的簡単であり、関連部分はその説明を参照すればよい。 Each embodiment in the present invention is described progressively, and each embodiment mainly describes differences from other embodiments, and the same or similar parts between each embodiment are referred to each other. do it. Since the device disclosed in the embodiment corresponds to the method disclosed in the embodiment, the description thereof is relatively simple, and the related portions may refer to the description.
上記は、本発明の好ましい実施例に過ぎず、本発明を何ら限定するものではない。本発明は、好ましい実施例によって以上のように説明したが、本発明を限定することを意図するものではない。当業者は、本発明の技術的方案から逸脱することなく、上記の方法と技術内容を用いて、本発明の技術的方案に多くの可能な変形及び修正を加えることができ、又は、それらを同等の変形例に変更することができる。従って、本発明の技術的方案から逸脱することなく、本発明の技術的本質に基づく上記の実施例に対する任意の単純な改変、均等物、及び変形は全て、本発明の保護の範囲内に属する。 The above are only preferred embodiments of the present invention and do not limit the present invention. Although the invention has been described above by means of preferred embodiments, it is not intended to limit the invention. A person skilled in the art can make many possible variations and modifications to the technical solution of the present invention using the above methods and technical contents without departing from the technical solution of the present invention, or It can be changed to an equivalent modification. Accordingly, any simple modifications, equivalents, and variations to the above-described embodiments based on the technical essence of the present invention are all within the scope of protection of the present invention without departing from the technical solution of the present invention. .
Claims (10)
有効電力の変化前後の発電所の共通接続点の電圧及び電流に基づいて、電力網インピーダンスを算出することと、
前記電力網インピーダンスとリアルタイムで取得する発電所の共通接続点の電圧と有効電力との関係に基づいて、無効電力補償係数を算出することと、
前記無効電力補償係数に基づいて、発電所の出力する必要がある無効電力を算出して発電所内の各インバータに発行することと、
を含むことを特徴とする発電所の共通接続点の電圧変動を抑制する方法。 Obtaining the voltage and current of the common connection point of the power plant before and after the change of the active power when satisfying a preset condition;
Calculating the power grid impedance based on the voltage and current at the common connection point of the power plant before and after the change in active power;
Calculating a reactive power compensation coefficient based on the relationship between the power grid impedance and the voltage of the common connection point of the power plant acquired in real time and the active power;
Based on the reactive power compensation coefficient, calculating the reactive power that needs to be output from the power plant and issuing it to each inverter in the power plant;
The method of suppressing the voltage fluctuation of the common connection point of the power plant characterized by including these.
予め設定された時間内の２つの時点における発電所の共通接続点の有効電力差分が第１の閾値よりも大きいと、前記予め設定された時間内の２つの時点における発電所の共通接続点の電圧をそれぞれ前記有効電力の変化前後の発電所の共通接続点の電圧とし、前記予め設定された時間内の２つの時点における発電所の共通接続点の電流をそれぞれ前記有効電力の変化前後の発電所の共通接続点の電流とし、
又は、発電所の共通接続点の有効電力が第２の閾値よりも大きい場合、制限コマンドを発電所内の各インバータに発行して、発電所の共通接続点の有効電力の変化差分を前記第１の閾値よりも大きくし、取得した入力情報に基づいて、前記有効電力の変化前後の発電所の共通接続点の電圧及び電流を取得する、
ことを含むことを特徴とする請求項１に記載の発電所の共通接続点の電圧変動を抑制する方法。 Obtaining the voltage and current of the common connection point of the power plant before and after the change of the active power when the previously set condition is satisfied,
If the active power difference of the power plant common connection point at two time points within a preset time is greater than the first threshold, the power plant common connection point at two time points within the preset time The voltage is the voltage at the common connection point of the power plant before and after the change of the active power, and the current at the common connection point of the power plant at two time points within the preset time is the power generation before and after the change of the active power. Current at the common connection point
Alternatively, when the active power at the common connection point of the power plant is larger than the second threshold value, a limit command is issued to each inverter in the power plant, and the change difference in the active power at the common connection point of the power plant is calculated. Greater than the threshold value, and based on the acquired input information, to acquire the voltage and current of the common connection point of the power plant before and after the change of the active power,
The method of suppressing the voltage fluctuation of the common connection point of the power plant of Claim 1 characterized by the above-mentioned.
Ｖp1=Ｖd1+ｊＶq1、Ｖp2=Ｖd2+ｊＶq2、Ｉp1=Ｉd1+ｊＩq1、Ｉp2=Ｉd2+ｊＩq2及びα=[(Ｖd1-Ｖd2)×(Ｉd1-Ｉd2)+(Ｖq1-Ｖq2)×(Ｉq1-Ｉq2)]÷[(Ｖq1-Ｖq2)×(Ｉd1-Ｉd2)-(Ｖd1-Ｖd2)×(Ｉq1-Ｉq2)]に基づいて電力網インピーダンス角αを算出することと、
ｒ=α×(Ｖd1-Ｖd2) ÷[α×(Ｉd1-Ｉd2)- (Ｉq1-Ｉq2)]に基づいて電力網インピーダンスｒを算出することと、
ｘ=(Ｖd1-Ｖd2) ÷[α×(Ｉd1-Ｉd2)- (Ｉq1-Ｉq2)]に基づいて電力網インピーダンスｘを算出することと、を含み、
なお、Ｖp1は有効電力の変化前の発電所の共通接続点の電圧であり、Ｖp2は有効電力の変化後の発電所の共通接続点の電圧であり、Ｉp1は有効電力の変化前の発電所の共通接続点の電流であり、Ｉp2は有効電力の変化後の発電所の共通接続点の電流である、
ことを特徴とする請求項１に記載の発電所の共通接続点の電圧変動を抑制する方法。 Based on the voltage and current of the common connection point of the power plant before and after the change of the active power as described above, calculating the power grid impedance,
V p1 = V d1 + jV q1 , V p2 = V d2 + jV q2 , I p1 = I d1 + jI q1 , I p2 = I d2 + jI q2 and α = [(V d1 −V d2 ) × (I d1 −I d2 ) + (V q1 −V q2 ) × (I q1 −I q2 )] ÷ [(V q1 −V q2 ) × (I d1 −I d2 ) − (V d1 −V d2 ) × (I q1 -I q2 )] to calculate the power grid impedance angle α,
r = α × (V d1 −V d2 ) ÷ [α × (I d1 −I d2 ) − (I q1 −I q2 )]
x = (V d1 −V d2 ) ÷ [α × (I d1 −I d2 ) − (I q1 −I q2 )],
V p1 is the voltage at the common connection point of the power plant before the change in active power, V p2 is the voltage at the common connection point of the power plant after the change in active power, and I p1 is the voltage before the change in active power. I p2 is the current at the common connection point of the power plant after the change in active power,
The method for suppressing voltage fluctuation at a common connection point of a power plant according to claim 1.
及び
に基づいて、無効電力補償係数Ｋを算出することを含み、
なお、ｒ及びｘは前記電力網インピーダンスであり、Ｐはリアルタイムで取得する発電所の共通接続点の有効電力であり、ＶPはリアルタイムで取得する発電所の共通接続点の電圧の絶対値である、
ことを特徴とする請求項１に記載の発電所の共通接続点の電圧変動を抑制する方法。 Based on the relationship between the power grid impedance and the voltage of the common connection point of the power plant acquired in real time and the active power, the reactive power compensation coefficient is calculated as described above.
as well as
Calculating a reactive power compensation coefficient K based on
Here, r and x are the power grid impedances, P is the effective power at the common connection point of the power plant acquired in real time, and VP is the absolute value of the voltage at the common connection point of the power plant acquired in real time. ,
The method for suppressing voltage fluctuation at a common connection point of a power plant according to claim 1.
に基づいて、発電所の出力する必要がある無効電力Ｑを算出することを含み、
なお、Ｋは前記無効電力補償係数であり、Ｐはリアルタイムで取得する発電所の共通接続点の有効電力である、
ことを特徴とする請求項１に記載の発電所の共通接続点の電圧変動を抑制する方法。 Based on the reactive power compensation coefficient described above, calculating the reactive power that needs to be output from the power plant,
Calculating reactive power Q that needs to be output from the power plant based on
K is the reactive power compensation coefficient, and P is the active power at the common connection point of the power plants acquired in real time.
The method for suppressing voltage fluctuation at a common connection point of a power plant according to claim 1.
予め設定された条件を満たす場合に、有効電力の変化前後の発電所の共通接続点の電圧及び電流を取得するための取得ユニットと、
有効電力の変化前後の発電所の共通接続点の電圧及び電流に基づいて、電力網インピーダンスを算出するための第１の算出ユニットと、
前記電力網インピーダンスとリアルタイムで取得する発電所の共通接続点の電圧と有効電力との関係に基づいて、無効電力補償係数を算出するための第２の算出ユニットと、
前記無効電力補償係数に基づいて、発電所の出力する必要がある無効電力を算出するための第３の算出ユニットと、
前記発電所の出力する必要がある無効電力を発電所内の各インバータに発行するための発行ユニットと、
を含むことを特徴とする発電所の共通接続点の電圧変動を抑制する装置。 A device for suppressing voltage fluctuation at a common connection point of a power plant,
An acquisition unit for acquiring the voltage and current of the common connection point of the power plant before and after the change of the active power when the preset condition is satisfied;
A first calculation unit for calculating the power grid impedance based on the voltage and current of the common connection point of the power plant before and after the change of the active power;
A second calculation unit for calculating a reactive power compensation coefficient based on the relationship between the power grid impedance and the voltage of the common connection point of the power plant acquired in real time and the active power;
A third calculation unit for calculating the reactive power that needs to be output from the power plant based on the reactive power compensation coefficient;
An issuing unit for issuing reactive power that needs to be output from the power plant to each inverter in the power plant;
The apparatus which suppresses the voltage fluctuation of the common connection point of the power plant characterized by including these.
予め設定された時間内の２つの時点における発電所の共通接続点の有効電力差分が第１の閾値よりも大きい場合に、前記予め設定された時間内の２つの時点における発電所の共通接続点の電圧をそれぞれ前記有効電力の変化前後の発電所の共通接続点の電圧とし、前記予め設定された時間内の２つの時点における発電所の共通接続点の電流をそれぞれ前記有効電力の変化前後の発電所の共通接続点の電流とするための自動取得ユニットと、
発電所の共通接続点の有効電力が第２の閾値よりも大きい場合に、前記発行ユニットが制限コマンドを発電所内の各インバータに発行することによって、発電所の共通接続点の有効電力の変化差分を前記第１の閾値よりも大きくし、取得した入力情報に基づいて前記有効電力の変化前後の発電所の共通接続点の電圧及び電流を取得するための手動取得ユニットと、
を含むことを特徴とする請求項６に記載の発電所の共通接続点の電圧変動を抑制する装置。 The acquisition unit is
The common connection point of the power plants at two time points within the preset time when the active power difference at the common connection point of the power plants at two time points within the preset time is greater than the first threshold value. Is the voltage at the common connection point of the power plant before and after the change of the active power, and the current at the common connection point of the power plant at the two time points within the preset time is before and after the change of the active power, respectively. An automatic acquisition unit for the current at the common connection point of the power plant,
When the active power at the common connection point of the power plant is larger than the second threshold, the issue unit issues a limit command to each inverter in the power plant, so that the difference in change in the active power at the common connection point of the power plant A manual acquisition unit for acquiring the voltage and current of the common connection point of the power plant before and after the change of the active power based on the acquired input information,
The apparatus which suppresses the voltage fluctuation of the common connection point of the power plant of Claim 6 characterized by the above-mentioned.
Ｖp1=Ｖd1+ｊＶq1、Ｖp2=Ｖd2+ｊＶq2、Ｉp1=Ｉd1+ｊＩq1、Ｉp2=Ｉd2+ｊＩq2及びα=[(Ｖd1-Ｖd2)×(Ｉd1-Ｉd2)+(Ｖq1-Ｖq2)×(Ｉq1-Ｉq2)]÷[(Ｖq1-Ｖq2)×(Ｉd1-Ｉd2)-(Ｖd1-Ｖd2)×(Ｉq1-Ｉq2)]に基づいて、電力網インピーダンス角αを算出するための第１のサブ算出ユニットと、
ｒ=α×(Ｖd1-Ｖd2) ÷[α×(Ｉd1-Ｉd2)- (Ｉq1-Ｉq2)]に基づいて、電力網インピーダンスｒを算出するための第２のサブ算出ユニットと、
ｘ=(Ｖd1-Ｖd2) ÷[α×(Ｉd1-Ｉd2)- (Ｉq1-Ｉq2)]に基づいて、電力網インピーダンスｘを算出するための第３のサブ算出ユニットと、
を含み、
なお、Ｖp1は有効電力の変化前の発電所の共通接続点の電圧であり、Ｖp2は有効電力の変化後の発電所の共通接続点の電圧であり、Ｉp1は有効電力の変化前の発電所の共通接続点の電流であり、Ｉp2は有効電力の変化後の発電所の共通接続点の電流である、
ことを特徴とする請求項６に記載の発電所の共通接続点の電圧変動を抑制する装置。 The first calculation unit is:
V p1 = V d1 + jV q1 , V p2 = V d2 + jV q2 , I p1 = I d1 + jI q1 , I p2 = I d2 + jI q2 and α = [(V d1 −V d2 ) × (I d1 −I d2 ) + (V q1 −V q2 ) × (I q1 −I q2 )] ÷ [(V q1 −V q2 ) × (I d1 −I d2 ) − (V d1 −V d2 ) × (I q1 -I q2 )], a first sub-calculation unit for calculating the power grid impedance angle α;
Based on r = α × (V d1 −V d2 ) ÷ [α × (I d1 −I d2 ) − (I q1 −I q2 )], a second sub-calculation unit for calculating the power grid impedance r ,
a third sub-calculation unit for calculating the power grid impedance x based on x = (V d1 −V d2 ) ÷ [α × (I d1 −I d2 ) − (I q1 −I q2 )];
Including
V p1 is the voltage at the common connection point of the power plant before the change in active power, V p2 is the voltage at the common connection point of the power plant after the change in active power, and I p1 is the voltage before the change in active power. I p2 is the current at the common connection point of the power plant after the change in active power,
The apparatus which suppresses the voltage fluctuation of the common connection point of the power plant of Claim 6 characterized by the above-mentioned.
及び
に基づいて、無効電力補償係数Ｋを算出し、
なお、ｒとｘは前記電力網インピーダンスであり、Ｐはリアルタイムで取得する発電所の共通接続点の有効電力であり、ＶPはリアルタイムで取得する発電所の共通接続点の電圧の絶対値である、
ことを特徴とする請求項６に記載の発電所の共通接続点の電圧変動を抑制する装置。 When calculating the reactive power compensation coefficient based on the relationship between the power grid impedance and the voltage of the common connection point of the power plant acquired in real time and the active power, the second calculation unit specifically,
as well as
Based on the above, the reactive power compensation coefficient K is calculated,
Here, r and x are the power grid impedances, P is the active power at the common connection point of the power plant acquired in real time, and VP is the absolute value of the voltage at the common connection point of the power plant acquired in real time. ,
The apparatus which suppresses the voltage fluctuation of the common connection point of the power plant of Claim 6 characterized by the above-mentioned.
に基づいて、発電所の出力する必要がある無効電力Ｑを算出し、
なお、Ｋは前記無効電力補償係数であり、Ｐはリアルタイムで取得する発電所の共通接続点の有効電力である、
ことを特徴とする請求項６に記載の発電所の共通接続点の電圧変動を抑制する装置。 When the third calculation unit calculates the reactive power that needs to be output from the power plant based on the reactive power compensation coefficient, specifically,
Based on the above, the reactive power Q that needs to be output from the power plant is calculated,
K is the reactive power compensation coefficient, and P is the active power at the common connection point of the power plants acquired in real time.
The apparatus which suppresses the voltage fluctuation of the common connection point of the power plant of Claim 6 characterized by the above-mentioned.
Applications Claiming Priority (2)
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| CN113067342A (en) * | 2021-05-17 | 2021-07-02 | 阳光电源股份有限公司 | Grid-connected point voltage fluctuation suppression method and new energy power station |
| CN114256875A (en) * | 2021-12-16 | 2022-03-29 | 中国长江三峡集团有限公司 | Wind-solar power storage station grid-connected point equivalent inertia evaluation method based on energy view angle |
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| TWI807488B (en) * | 2021-11-17 | 2023-07-01 | 盈正豫順電子股份有限公司 | Power-factor compensation control method and system for photovoltaic power plants |
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