JP7033253B2 - Power flow calculation device - Google Patents

Power flow calculation device Download PDF

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JP7033253B2
JP7033253B2 JP2018010729A JP2018010729A JP7033253B2 JP 7033253 B2 JP7033253 B2 JP 7033253B2 JP 2018010729 A JP2018010729 A JP 2018010729A JP 2018010729 A JP2018010729 A JP 2018010729A JP 7033253 B2 JP7033253 B2 JP 7033253B2
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悠人 長田
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Fuji Electric Co Ltd
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この発明は、分散型電源が接続された電力系統における電圧、有効電力、無効電力等の状態や分布を計算する電力潮流計算装置に関するものである。 The present invention relates to a power flow calculation device for calculating the state and distribution of voltage, active power, reactive power, etc. in a power system to which a distributed power source is connected.

配電系統の制御において、電力事業者には、一般需要家の電圧を所定の管理幅(101±6[V])に維持することが求められている。
一方、近年では、太陽光発電装置等の分散型電源の普及により、逆潮流の発生や配電系統の負荷分布の急変に起因して、系統電圧を上記の管理幅に維持することが困難になってきており、系統電圧を維持するには、電圧制御機器の制御定数の変更や新規設備の導入が必要になる。
そこで、電圧制御機器の制御定数の変更等によって電力系統の電圧や電力潮流(有効・無効電力の流れ)がどのように変化するかをシミュレーションするために、電力潮流計算が用いられている。
In the control of the distribution system, the electric power company is required to maintain the voltage of a general consumer within a predetermined control range (101 ± 6 [V]).
On the other hand, in recent years, due to the spread of distributed power sources such as photovoltaic power generation devices, it has become difficult to maintain the system voltage within the above control range due to the occurrence of reverse power flow and sudden changes in the load distribution of the distribution system. In order to maintain the system voltage, it is necessary to change the control constants of voltage control equipment and introduce new equipment.
Therefore, power flow calculation is used to simulate how the voltage of the power system and the power flow (flow of effective / ineffective power) change due to a change in the control constant of the voltage control device.

図6は、実際の電力系統に対応する系統モデルの構成図である。
図6において、Gは系統電源、SVRはタップの切り替えにより出力電圧を調整する自動電圧調整器、Fは配電線、PVは太陽光発電装置、Loadは需要家、N~Nはノードを示す。
FIG. 6 is a configuration diagram of a system model corresponding to an actual power system.
In FIG. 6, G is a grid power supply, SVR is an automatic voltage regulator that adjusts the output voltage by switching taps, F is a distribution line, PV is a photovoltaic power generation device, Road is a consumer, and N1 to N4 are nodes. show.

電力潮流計算では、下記の数式1に示すように、系統電源Gの電圧V,自動電圧調節器SVRの変圧比(タップ)や配電線Fのインピーダンス(抵抗R及びリアクタンスX)等の設備情報、太陽光発電装置PVの有効電力PPV及び無効電力QPVからなる発電情報、需要家Loadの有効電力PLoad及び無効電力QLoadからなる負荷情報を入力として、各ノードN~Nにおける電圧V~Vや有効電力P~P、無効電力Q~Qの分布を求めている。なお、SVRの変圧比ではなく、目標電圧とLDC(Line Drop Compensator)制御のr,xを入力しても良い。
[数式1]
[V1~4,P1~4,Q1~4]=f(V,Tap,r,x,PPV,QPV,PLoad,QLoad
In the power flow calculation, as shown in Equation 1 below, equipment information such as the voltage V s of the system power supply G, the transformation ratio (tap) of the automatic voltage regulator SVR, and the impedance (resistance R and reactorance X) of the distribution line F. , The power generation information consisting of the active power P PV and the ineffective power Q PV of the solar power generation device PV, and the load information consisting of the active power P Road and the ineffective power Q Road of the consumer Road are input to each node N1 to N4 . The distributions of the voltages V1 to V4 , the active powers P1 to P4 , and the ineffective powers Q1 to Q4 are obtained. In addition, instead of the transformation ratio of SVR, the target voltage and r, x of LDC (Line Drop Composer) control may be input.
[Formula 1]
[V 1 to 4 , P 1 to 4 , Q 1 to 4 ] = f (V s , Tap, r, x, P PV , Q PV , P Road , Q Road )

このような電力潮流計算方法としては、一般に高電圧のループ状系統に適用されるNR(Newton-Raphson)法や、放射状系統に特化した特許文献1記載のBFS(Backward-Forward Sweep)法が知られている。
このうち、BFS法では、図7(a)に示すように、初期設定(ステップS201)により電力系統の基準電圧を決定した後、放射状系統の末端側から電流または電力潮流を計算していくBackward Sweepという計算処理(ステップS202)と、放射状系統の電源側から電圧変化を計算していくForward Sweepという計算処理(ステップS203)とを繰り返し実行し、電圧の誤差が前回計算時と比較して規定値より小さくなった時点、或いは、放射状系統の末端での電流もしくは電力潮流が規定値より小さくなった時点で計算が収束したと判断して終了する(ステップS204 Yes)。
As such a power flow calculation method, the NR (Newton-Raphson) method generally applied to a high voltage loop-shaped system and the BFS (Backward-Forward Sweep) method described in Patent Document 1 specialized in a radial system are used. Are known.
Of these, in the BFS method, as shown in FIG. 7A, after determining the reference voltage of the power system by the initial setting (step S201), the current or the power flow is calculated from the terminal side of the radial system. The calculation process called Sweep (step S202) and the calculation process called Forward Swep (step S203) that calculates the voltage change from the power supply side of the radial system are repeatedly executed, and the voltage error is specified as compared with the previous calculation. It is determined that the calculation has converged when the value becomes smaller than the value, or when the current or power flow at the end of the radial system becomes smaller than the specified value, and the process ends (step S204 Yes).

また、特に太陽光発電装置等の分散型電源が導入された電力系統では、時間により変動する分散型電源の発電量に対応できるか否かを評価する必要があるため、潮流計算を実行するごとに計算時間に対応した負荷や発電量にて、連続した時間の系統状態を計算(連続潮流計算)する。
図7(b)は、上述した連続潮流計算のフローチャートである。1日のうち複数時間の電圧分布を求める場合には、まず、計算時間に応じた負荷や発電量を設定する(ステップS100)。そして、例えばn分(例えば1分から10分程度)ごとに、図7(a)に示した潮流計算を、時間を増加させながら終了時間になるまで連続的に行う(ステップS200~S400)。
In addition, especially in a power system in which a distributed power source such as a photovoltaic power generation device is introduced, it is necessary to evaluate whether or not it can cope with the amount of power generated by the distributed power source that fluctuates with time. The system state for continuous time is calculated (continuous power flow calculation) with the load and power generation amount corresponding to the calculation time.
FIG. 7B is a flowchart of the continuous power flow calculation described above. When obtaining the voltage distribution for a plurality of hours in a day, first, the load and the amount of power generation according to the calculation time are set (step S100). Then, for example, every n minutes (for example, about 1 to 10 minutes), the tidal current calculation shown in FIG. 7A is continuously performed until the end time is reached while increasing the time (steps S200 to S400).

この場合、前回(n分前)の時間断面で計算した電圧分布或いは電流もしくは電力潮流を初期値として、今回の潮流計算に利用することができる。通常、需要家の負荷は緩やかに変化し、短時間(例えば1分から10分程度)では大きく変化しないことが多い。このため、連続潮流計算においては、前回の潮流計算時の電圧値を初期値として設定すれば計算が収束しやすくなる。
または、前回(n分前)の時間断面で計算した電流もしくは電力潮流を初期値として、今回の潮流計算に利用することもできる。連続潮流計算においては、前回の潮流計算時の電流もしくは電力潮流を初期値として設定すれば、計算が収束しやすくなる。電流もしくは電力潮流を初期値として設定する場合、図7(a)の初期設定(ステップS201)では電力系統の電流もしくは電力潮流を初期値として設定する。既に電力系統の電流もしくは電力潮流があるため、1度目のBackward Sweepという計算処理(ステップS202)はスキップする。その後、放射状系統の電源側から電圧変化を計算していくForward Sweepという計算処理(ステップS203)を行う。2回目以降は、電圧を初期値とする場合と同じである。
以下では電圧を初期とした場合の手法を説明するが、電流や電力潮流を初期値としても構わない。
In this case, the voltage distribution or current or power flow calculated in the time section of the previous time (n minutes ago) can be used as the initial value for the current power flow calculation. Usually, the load on the consumer changes slowly, and often does not change significantly in a short time (for example, about 1 to 10 minutes). Therefore, in the continuous power flow calculation, if the voltage value at the time of the previous power flow calculation is set as the initial value, the calculation can be easily converged.
Alternatively, the current or power flow calculated in the time section of the previous time (n minutes ago) can be used as the initial value for the current power flow calculation. In the continuous power flow calculation, if the current or power flow at the time of the previous power flow calculation is set as the initial value, the calculation can be easily converged. When the current or power flow is set as the initial value, the current or power flow of the power system is set as the initial value in the initial setting (step S201) of FIG. 7A. Since there is already a current or power flow in the power system, the first calculation process called Backward Swep (step S202) is skipped. After that, a calculation process (step S203) called Forward Swep, which calculates the voltage change from the power supply side of the radial system, is performed. The second and subsequent times are the same as when the voltage is set as the initial value.
In the following, the method when the voltage is set as the initial value will be described, but the current or power flow may be used as the initial value.

ここで、図8は、電力系統のある点において、BFS法による潮流計算を繰り返し実行した場合の、計算の繰り返し回数に応じた電圧の収束状態を概念的に示した図である。
実際の電力系統には、電圧値によって制御量が変化する電圧制御機器等が存在するため、図8に示すほど単純ではないが、計算の繰り返し回数が多くなるほど電圧は収束値へと近付いていくことが多い。しかし、電圧の初期値が収束値に対して離れ過ぎている場合には、BFS法、NR法の何れの方法でも、計算が収束せずに発散してしまい、解が得られない場合がある。
Here, FIG. 8 is a diagram conceptually showing the convergence state of the voltage according to the number of repetitions of the calculation when the power flow calculation by the BFS method is repeatedly executed at a certain point of the power system.
In the actual power system, there are voltage control devices and the like whose control amount changes depending on the voltage value, so it is not as simple as shown in FIG. 8, but the voltage approaches the convergent value as the number of repetitions of the calculation increases. Often. However, if the initial value of the voltage is too far from the convergence value, the calculation may diverge without converging with either the BFS method or the NR method, and a solution may not be obtained. ..

従来では、電圧の初期値を基準電圧または前回潮流計算時の電圧値に設定することが多い。しかし、近年では太陽光発電装置等の分散型電源の普及が進んでいるため、日射量により、短時間であっても出力が大きく変化することがある。このため、連続潮流計算において、前回潮流計算時の電圧を初期値として設定しても、計算が発散してしまう場合がある。 Conventionally, the initial value of the voltage is often set to the reference voltage or the voltage value at the time of the previous power flow calculation. However, in recent years, since distributed power sources such as photovoltaic power generation devices have become widespread, the output may change significantly even for a short time depending on the amount of solar radiation. Therefore, in the continuous power flow calculation, even if the voltage at the time of the previous power flow calculation is set as the initial value, the calculation may diverge.

一方、特許文献2には、本来の潮流計算が発散して最適解を求めることができない場合に、電圧の位相角及び大きさが有効電力,無効電力にそれぞれ比例するという線形近似により簡易潮流計算を行うようにした最適潮流計算装置が記載されている。 On the other hand, in Patent Document 2, when the original power flow calculation diverges and the optimum solution cannot be obtained, the simple power flow calculation is performed by linear approximation that the phase angle and magnitude of the voltage are proportional to the active power and the reactive power, respectively. The optimum power flow calculation device for performing the above is described.

特開平8-214458号公報([0019]~[0021]、図4等)Japanese Unexamined Patent Publication No. 8-214458 ([0019] to [0021], FIG. 4, etc.) 特許第3986675号公報([0017],[0081]、図7等)Japanese Patent No. 3986675 ([0017], [0081], FIG. 7, etc.)

前述の特許文献2に記載された最適潮流計算装置では、潮流計算が発散する場合に簡易潮流計算を行って近似解を求めているため、求められた電圧分布等が最適である保証はない。
そこで、本発明の解決課題は、潮流計算が発散する場合には電圧等の初期値を変更して再度、計算を行うことにより、潮流計算を確実に収束させるようにした電力潮流計算装置を提供することにある。
In the optimum power flow calculation device described in Patent Document 2 described above, when the power flow calculation diverges, a simple power flow calculation is performed to obtain an approximate solution, so that there is no guarantee that the obtained voltage distribution or the like is optimal.
Therefore, the problem to be solved by the present invention is to provide a power flow calculation device that ensures that the power flow calculation is converged by changing the initial value such as voltage and performing the calculation again when the power flow calculation diverges. To do.

上記課題を解決するため、請求項1に係る発明は、電子計算装置のハードウェア及びソフトウェアにより構成される電力潮流計算装置であって、
分散型電源を有する電力系統の設備情報、前記電力系統の発電量,負荷量を含む発電・負荷情報が入力されるデータ入力部と、前記設備情報及び前記発電・負荷情報に基づいて前記電力系統の各点における電圧及び有効電力・無効電力を計算する潮流計算部と、前記潮流計算部による計算結果を出力するデータ出力部と、を備え、
前記潮流計算部は、
計算の発散・収束を判定する判定手段と、少なくとも前記電力系統の各点における電圧、電流または電力潮流の何れかの初期値を変更する初期値変更手段と、を有し、前記判定手段により計算の発散を判定した場合には前記判定手段により計算の収束が判定されるまで、前記初期値変更手段により前記初期値を変更して再計算を行う機能を備え、
前記初期値変更手段は、
前記分散型電源の発電量が最大で負荷の需要量が最小である時の前記電力系統の各点における電圧と前記電力系統の送り出し電圧との差分と、所定の係数との積を求め、この積を前記送り出し電圧に加算した値を前記各点における電圧の初期値として設定することを特徴とする。
In order to solve the above problems, the invention according to claim 1 is a power flow calculation device composed of hardware and software of an electronic calculation device.
A data input unit for inputting equipment information of a power system having a distributed power source, power generation amount of the power system, and power generation / load information including the load amount, and the power system based on the equipment information and the power generation / load information. It is equipped with a power flow calculation unit that calculates the voltage and active power / invalid power at each point of the above, and a data output unit that outputs the calculation result by the power flow calculation unit.
The tidal current calculation unit
It has a determination means for determining divergence / convergence of calculation and an initial value changing means for changing at least an initial value of voltage, current, or power flow at each point of the power system, and is calculated by the determination means. When the divergence of the above is determined, the determination means has a function of changing the initial value and recalculating until the determination of convergence of the calculation is determined.
The initial value changing means is
The product of the difference between the voltage at each point of the power system and the output voltage of the power system when the power generation amount of the distributed power source is the maximum and the demand amount of the load is the minimum, and a predetermined coefficient is obtained. It is characterized in that the value obtained by adding the product to the delivery voltage is set as the initial value of the voltage at each of the points .

請求項2に係る発明は、電子計算装置のハードウェア及びソフトウェアにより構成される電力潮流計算装置であって、
分散型電源を有する電力系統の設備情報、前記電力系統の発電量,負荷量を含む発電・負荷情報が入力されるデータ入力部と、前記設備情報及び前記発電・負荷情報に基づいて前記電力系統の各点における電圧及び有効電力・無効電力を計算する潮流計算部と、前記潮流計算部による計算結果を出力するデータ出力部と、を備え、
前記潮流計算部は、
計算の発散・収束を判定する判定手段と、少なくとも前記電力系統の各点における電圧、電流または電力潮流の何れかの初期値を変更する初期値変更手段と、を有し、前記判定手段により計算の発散を判定した場合には前記判定手段により計算の収束が判定されるまで、前記初期値変更手段により前記初期値を変更して再計算を行う機能を備え、
前記初期値変更手段は、
前記分散型電源の発電量が最大で負荷の需要量が最小である時の前記電力系統の各点における電流或いは電力潮流を潮流計算により求め、この電流或いは電力潮流と所定の係数との積を前記各点における電流或いは電力潮流の初期値として設定することを特徴とする。
The invention according to claim 2 is a power flow calculation device composed of hardware and software of an electronic calculation device.
A data input unit for inputting equipment information of a power system having a distributed power source, power generation amount of the power system, and power generation / load information including the load amount, and the power system based on the equipment information and the power generation / load information. It is equipped with a power flow calculation unit that calculates the voltage and active power / invalid power at each point of the above, and a data output unit that outputs the calculation result by the power flow calculation unit.
The tidal current calculation unit
It has a determination means for determining divergence / convergence of calculation and an initial value changing means for changing at least an initial value of voltage, current, or power flow at each point of the power system, and is calculated by the determination means. When the divergence of the above is determined, the determination means has a function of changing the initial value and recalculating until the determination of convergence of the calculation is determined.
The initial value changing means is
The current or power flow at each point of the power system when the power generation amount of the distributed power source is the maximum and the demand amount of the load is the minimum is obtained by power flow calculation, and the product of this current or power flow and a predetermined coefficient. Is set as the initial value of the current or the power flow at each of the above points .

請求項3に係る発明は、電子計算装置のハードウェア及びソフトウェアにより構成される電力潮流計算装置であって、
分散型電源を有する電力系統の設備情報、前記電力系統の発電量,負荷量を含む発電・負荷情報が入力されるデータ入力部と、前記設備情報及び前記発電・負荷情報に基づいて前記電力系統の各点における電圧及び有効電力・無効電力を計算する潮流計算部と、前記潮流計算部による計算結果を出力するデータ出力部と、を備え、
前記潮流計算部は、
計算の発散・収束を判定する判定手段と、少なくとも前記電力系統の各点における電圧、電流または電力潮流の何れかの初期値を変更する初期値変更手段と、を有し、前記判定手段により計算の発散を判定した場合には前記判定手段により計算の収束が判定されるまで、前記初期値変更手段により前記初期値を変更して再計算を行う機能を備え、
前記初期値変更手段は、
前記分散型電源の発電量が最で負荷の需要量が最である時の前記電力系統の各点における電圧と前記電力系統の送り出し電圧との差分と、所定の係数との積を求め、この積を前記送り出し電圧に加算した値を前記各点における電圧の初期値として設定することを特徴とする。
The invention according to claim 3 is a power flow calculation device composed of hardware and software of an electronic calculation device.
A data input unit for inputting equipment information of a power system having a distributed power source, power generation amount of the power system, and power generation / load information including the load amount, and the power system based on the equipment information and the power generation / load information. It is equipped with a power flow calculation unit that calculates the voltage and active power / invalid power at each point of the above, and a data output unit that outputs the calculation result by the power flow calculation unit.
The tidal current calculation unit
It has a determination means for determining divergence / convergence of calculation and an initial value changing means for changing at least an initial value of voltage, current, or power flow at each point of the power system, and is calculated by the determination means. When the divergence of the above is determined, the determination means has a function of changing the initial value and recalculating until the determination of convergence of the calculation is determined.
The initial value changing means is
The product of the difference between the voltage at each point of the power system and the output voltage of the power system when the power generation amount of the distributed power source is the minimum and the demand amount of the load is the maximum , and a predetermined coefficient. The product is obtained, and the value obtained by adding this product to the sending voltage is set as the initial value of the voltage at each of the points .

請求項4に係る発明は、電子計算装置のハードウェア及びソフトウェアにより構成される電力潮流計算装置であって、
分散型電源を有する電力系統の設備情報、前記電力系統の発電量,負荷量を含む発電・負荷情報が入力されるデータ入力部と、前記設備情報及び前記発電・負荷情報に基づいて前記電力系統の各点における電圧及び有効電力・無効電力を計算する潮流計算部と、前記潮流計算部による計算結果を出力するデータ出力部と、を備え、
前記潮流計算部は、
計算の発散・収束を判定する判定手段と、少なくとも前記電力系統の各点における電圧、電流または電力潮流の何れかの初期値を変更する初期値変更手段と、を有し、前記判定手段により計算の発散を判定した場合には前記判定手段により計算の収束が判定されるまで、前記初期値変更手段により前記初期値を変更して再計算を行う機能を備え、
前記初期値変更手段は、
前記分散型電源の発電量が最小で負荷の需要量が最大である時の前記電力系統の各点における電流或いは電力潮流を求め、この電流或いは電力潮流と所定の係数との積を前記各点における電流或いは電力潮流の初期値として設定することを特徴とする。
The invention according to claim 4 is a power flow calculation device composed of hardware and software of an electronic calculation device.
A data input unit for inputting equipment information of a power system having a distributed power source, power generation amount of the power system, and power generation / load information including the load amount, and the power system based on the equipment information and the power generation / load information. It is equipped with a power flow calculation unit that calculates the voltage and active power / invalid power at each point of the above, and a data output unit that outputs the calculation result by the power flow calculation unit.
The tidal current calculation unit
It has a determination means for determining divergence / convergence of calculation and an initial value changing means for changing at least an initial value of voltage, current, or power flow at each point of the power system, and is calculated by the determination means. When the divergence of the above is determined, the determination means has a function of changing the initial value and recalculating until the determination of convergence of the calculation is determined.
The initial value changing means is
The current or power flow at each point of the power system when the power generation amount of the distributed power source is the minimum and the demand amount of the load is the maximum is obtained, and the product of this current or power flow and a predetermined coefficient is calculated as described above. It is characterized in that it is set as an initial value of a current or a power flow at a point .

請求項5に係る発明は、請求項1~4の何れか1項に記載した電力潮流計算装置において、
前記初期値変更手段により初期値を変更して前記潮流計算部が計算した結果を新たな初期値として、前記潮流計算部が所定の時間ごとに連続して潮流を計算することを特徴とする。
The invention according to claim 5 is the power flow calculation device according to any one of claims 1 to 4 .
The current value is changed by the initial value changing means, and the result calculated by the tidal current calculation unit is used as a new initial value, and the tidal current calculation unit continuously calculates the tidal current at predetermined time intervals .

本発明によれば、潮流計算が発散する場合に、電力系統の各点における電圧等の初期値を変更して繰り返し計算し直すことにより、潮流計算を収束させ、電力系統の電圧や電力潮流の分布を確実に把握することができる。 According to the present invention, when the power flow calculation diverges, the power flow calculation is converged by changing the initial value of the voltage or the like at each point of the power system and recalculating repeatedly, so that the voltage of the power system or the power flow can be calculated. The distribution can be grasped reliably.

本発明の実施形態が適用される電力系統をモデル化した構成図である。It is a block diagram which modeled the electric power system to which the embodiment of this invention is applied. 図1における電子計算装置の機能を示すブロック図である。It is a block diagram which shows the function of the electronic calculation apparatus in FIG. 本発明の実施形態による連続潮流計算のフローチャートである。It is a flowchart of continuous power flow calculation by embodiment of this invention. 本発明の実施形態における高めの初期値の説明図である。It is explanatory drawing of the high initial value in embodiment of this invention. 本発明の実施形態における、前回潮流計算時の電圧初期値、新たに設定される高めの初期値,低めの初期値等の説明図である。It is explanatory drawing of the voltage initial value at the time of the last power flow calculation, the newly set high initial value, the low initial value, etc. in the Embodiment of this invention. 系統モデルの構成図である。It is a block diagram of a system model. BFS法による計算手順の説明図(図7(a))及び連続潮流計算方法の説明図(図7(b))である。It is explanatory drawing (FIG. 7 (a)) of the calculation procedure by the BFS method, and the explanatory diagram (FIG. 7 (b)) of the continuous power flow calculation method. 電力系統のある時点においてBFS法を繰り返し実行した場合の、電圧の収束状態を概念的に示した図である。It is a figure which conceptually showed the convergence state of the voltage when the BFS method is repeatedly executed at a certain time point of a power system.

以下、図に沿って本発明の実施形態を説明する。
図1は、この実施形態が適用される電力系統をモデル化した構成図である。図1において、系統モデルの構成は図6と同一であり、系統電源G、自動電圧調整器SVR、配電線F、太陽光発電装置PV、需要家Load、ノードN~Nを備えている。
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a configuration diagram modeling a power system to which this embodiment is applied. In FIG. 1, the configuration of the grid model is the same as that of FIG. 6, and includes a grid power supply G, an automatic voltage regulator SVR, a distribution line F, a photovoltaic power generation device PV, a consumer Road, and nodes N1 to N4. ..

潮流計算を行う電子計算装置10は、例えばパーソナルコンピュータ(PC)等のハードウェアとこれに実装されたソフトウェアとによって構成されている。この電子計算装置10には、系統電源Gの電圧Vs,t、配電線Fの抵抗r及びリアクタンスx、自動電圧調整器SVRの変圧比Tap,等の設備情報と、太陽光発電装置PVの有効電力PPV,t,無効電力QPV,tからなる発電情報と、需要家Loadの有効電力PLoad,t,無効電力QLoad,tからなる負荷情報とが入力される。ここで、添え字tを付けた諸量は時間によって値が変化するものである。
電子計算装置10は、n分(例えば1分から10分程度)ごとに連続して潮流計算を行い、電力系統の各点における電圧V1,t~V4,tや有効電力P1,t~P4,t,無効電力Q1,t~Q4,t等の電力潮流の分布を出力する。
The electronic calculation device 10 that performs the power flow calculation is composed of hardware such as a personal computer (PC) and software mounted on the hardware. The electronic computing device 10 contains equipment information such as the voltage V s, t of the system power supply G, the resistance r and reactorance x of the distribution line F, the transformation ratio Tap, t of the automatic voltage regulator SVR, and the solar power generation device PV. The power generation information consisting of the active power P PV, t and the reactive power Q PV, t of the consumer Road and the load information consisting of the active power P Road, t , the reactive power Q Road, t of the consumer Road are input. Here, the values of the quantities with the subscript t change with time.
The electronic computing device 10 continuously calculates the power flow every n minutes (for example, about 1 to 10 minutes), and the voltage V 1, t to V 4, t and the active power P 1, t to each point of the power system are calculated. Outputs the distribution of power flow such as P 4, t , reactive power Q 1, t to Q 4, t .

図2は、電子計算装置10の機能を示すブロック図である。
図2において、データ入力部11には、前述した設備情報、発電情報・負荷情報が適宜な伝送手段を介して入力される。
潮流計算部12では、演算処理手段の動作によって図7(b)に示したような連続潮流計算を行い、電力系統の各点における電圧、有効電力,無効電力を演算する。また、潮流計算部12は、後述するように、潮流計算の発散・収束を判定し、かつ、電力系統の各点における電圧等の初期値を変更する手段を備えている。これらの演算、判定、初期値変更等の処理は、コンピュータのハードウェア及びソフトウェアの機能によって実現されるものである。
連続潮流計算により得られた電力系統の各部の電圧V1,t~V4,tや電力潮流(有効電力P1,t~P4,t,無効電力Q1,t~Q4,t)の分布は、データ出力部13によりディスプレイに表示され、あるいは図示されていない上位の系統監視装置等に伝送される。
FIG. 2 is a block diagram showing the functions of the electronic computing device 10.
In FIG. 2, the above-mentioned equipment information, power generation information, and load information are input to the data input unit 11 via an appropriate transmission means.
The power flow calculation unit 12 performs continuous power flow calculation as shown in FIG. 7B by the operation of the calculation processing means, and calculates the voltage, active power, and reactive power at each point of the power system. Further, as will be described later, the power flow calculation unit 12 is provided with means for determining the divergence / convergence of the power flow calculation and changing the initial value of the voltage or the like at each point of the power system. Processing such as these calculations, determinations, and initial value changes are realized by the functions of computer hardware and software.
Voltages V 1, t to V 4, t and power flow (active power P 1, t to P 4, t , reactive power Q 1, t to Q 4, t ) of each part of the power system obtained by continuous power flow calculation. The distribution of is displayed on the display by the data output unit 13, or is transmitted to a higher-level system monitoring device or the like (not shown).

図3は、潮流計算部12により実行される連続潮流計算のフローチャートを示している。
まず、今回の計算が連続潮流計算の初回か2回目以降かを判定し、初回である場合は(ステップS1 YES)、前回潮流計算結果がないため、電力系統の基準電圧を初期値として潮流計算を実行する(ステップS2)。今回の計算が2回目以降である場合は(ステップS1 NO)、前回潮流計算時の各点の電圧を初期値として潮流計算を実行する(ステップS3)。
FIG. 3 shows a flowchart of continuous power flow calculation executed by the power flow calculation unit 12.
First, it is determined whether this calculation is the first time or the second time or later of the continuous power flow calculation, and if it is the first time (step S1 YES), since there is no previous power flow calculation result, the power flow calculation is performed with the reference voltage of the power system as the initial value. Is executed (step S2). If the current calculation is the second or later (step S1 NO), the power flow calculation is executed with the voltage at each point at the time of the previous power flow calculation as the initial value (step S3).

ステップS2またはステップS3による潮流計算を実行した後、計算が収束したか否かを判定する(ステップS4)。収束の判定は、例えば、図7(a)に示したBFS法による潮流計算の繰り返し時に、系統内の各点の電圧V1,t~V4,tを前回計算時の電圧V1,t-1~V4,t-1とそれぞれ比較し、全ての点で電圧の差が1.00-6[p.u.]以下となったら計算が収束したと判定する(ステップS4 YES)。
また、発散の判定は、例えば、上限電圧を1.5 [p.u.]、下限電圧を0.5 [p.u.]とし、各点の電圧V1,t~V4,tのうちの何れかが、BFS法による潮流計算の繰り返し時に上記の上限電圧を上回るか、あるいは下限電圧を下回った場合に計算が発散していると判定する(ステップS4 NO)。
なお、この実施形態では潮流計算にBFS法を用いているが、本発明は、NR法を用いる場合にも同様に適用可能である。
After executing the power flow calculation according to step S2 or step S3, it is determined whether or not the calculation has converged (step S4). For the determination of convergence, for example, when the power flow calculation by the BFS method shown in FIG. 7A is repeated, the voltages V 1, t to V 4, t at each point in the system are set to the voltages V 1, t at the time of the previous calculation. -1 to V 4, t-1 are compared with each other, and when the voltage difference is 1.00-6 [p.u.] or less at all points, it is determined that the calculation has converged (step S4 YES).
Further, in the determination of divergence, for example, the upper limit voltage is 1.5 [p.u.] and the lower limit voltage is 0.5 [p.u.], and the voltages V 1, t to V 4, t at each point are determined. When any one of them exceeds the above upper limit voltage or falls below the lower limit voltage when the power flow calculation by the BFS method is repeated, it is determined that the calculation is divergent (step S4 NO).
Although the BFS method is used for the power flow calculation in this embodiment, the present invention can be similarly applied to the case where the NR method is used.

次に、ステップS4で発散と判定された場合に、発散の方向を判定する(ステップS5)。
計算した電圧が前述した上限電圧の1.5 [p.u.]を上回って発散していた場合、つまり高電圧方向に発散していた場合には、収束する電圧が高めにあると想定されるため、現在の初期値より高めの電圧を初期値に設定して潮流計算を実行する(ステップS6)。また、計算した電圧が下限電圧の0.5 [p.u.]を下回って発散していた場合、つまり低電圧方向に発散していた場合には、収束する電圧が低めにあると想定されるため、現在の初期値より低めの電圧を初期値に設定して潮流計算を実行する(ステップS7)。
Next, when the divergence is determined in step S4, the direction of divergence is determined (step S5).
If the calculated voltage diverges above the above-mentioned upper limit voltage of 1.5 [p.u.], that is, if it diverges in the high voltage direction, it is assumed that the converging voltage is higher. Therefore, a voltage higher than the current initial value is set as the initial value, and the power flow calculation is executed (step S6). If the calculated voltage diverges below the lower limit voltage of 0.5 [p.u.], that is, if it diverges in the low voltage direction, it is assumed that the converging voltage is low. Therefore, a voltage lower than the current initial value is set as the initial value, and the power flow calculation is executed (step S7).

ここで、初期値として新たに設定される高めの電圧(以下、高めの初期値),低めの電圧(以下、低めの初期値)について説明する。
まず、高めの初期値とは、例えば、電力系統に接続されている太陽光発電装置PVの出力が最大であって需要家Loadの負荷が最小である時の各点の電圧分布を計算し、この電圧分布と電力系統の送り出し電圧(系統電源Gの電圧)Vとの差分値であるΔVに係数K(K=0~1)を掛けた値を送り出し電圧Vに加算した電圧(その電圧分布)をいう。
また、低めの初期値とは、太陽光発電装置PVの出力が最小(ゼロを含む)であって需要家Loadの負荷が最大である時の各点の電圧分布を計算し、この電圧分布と送り出し電圧Vとの差分値である負の値ΔVに係数K(K=0~1)を掛けた値を送り出し電圧Vに加算した電圧(その電圧分布)をいう。
電流或いは電力潮流を初期値とする場合は、高めの電圧に相当する初期値として、電力系統に接続されている太陽光発電装置PVの出力が最大であって需要家Loadの負荷が最小である時の各点の電流或いは電力潮流を計算し、この値に係数K(K=0~1)を掛けた値を各点の初期値として設定する。また、低めの電圧に相当する初期値として、太陽光発電装置PVの出力が最小(ゼロを含む)であって需要家Loadの負荷が最大である時の各点の電流或いは電力潮流を計算し、この値に係数K(K=0~1)を掛けた値を各点の初期値として設定する。
Here, a high voltage (hereinafter, high initial value) and a low voltage (hereinafter, low initial value) newly set as initial values will be described.
First, the high initial value is, for example, the voltage distribution at each point when the output of the solar power generation device PV connected to the power system is the maximum and the load of the consumer Load is the minimum is calculated. The voltage obtained by multiplying ΔV, which is the difference value between this voltage distribution and the output voltage of the power system (voltage of the system power supply G) V s , by the coefficient K (K = 0 to 1) and adding it to the output voltage V s (the voltage thereof). Voltage distribution).
The low initial value is the voltage distribution at each point when the output of the solar power generation device PV is the minimum (including zero) and the load of the consumer Load is the maximum, and this voltage distribution is used. The voltage (voltage distribution thereof) obtained by multiplying the negative value ΔV, which is the difference value from the sending voltage V s , by the coefficient K (K = 0 to 1) and adding it to the sending voltage V s .
When the initial value is current or power flow, the output of the PV of the photovoltaic power generation device connected to the power system is the maximum and the load on the consumer Load is the minimum as the initial value corresponding to the higher voltage. The current or power flow at each point of time is calculated, and the value obtained by multiplying this value by the coefficient K (K = 0 to 1) is set as the initial value of each point. In addition, as an initial value corresponding to a lower voltage, the current or power flow at each point when the output of the photovoltaic power generation device PV is the minimum (including zero) and the load of the consumer Load is the maximum is calculated. , The value obtained by multiplying this value by the coefficient K (K = 0 to 1) is set as the initial value of each point.

図4は、高めの初期値を概念的に説明した図であり、K=0の場合、K=0.5の場合、及びK=1の場合の、送り出し点(系統電源G)からの距離に応じた電圧の初期値をそれぞれ示している。図示するように、係数Kを適宜設定し、各点の電圧と送り出し電圧Vとの差分ΔVと係数Kとの積を送り出し電圧Vに加算することで、系統上の各点における電圧の新たな初期値を求めることができる。
なお、図5は、前回潮流計算時の電圧初期値と、新たに設定される高めの初期値,低めの初期値を概念的に示した図である。
上述した新たな初期値の演算・変更や、計算の収束及び発散の判定は、潮流計算部12の演算処理によって容易に実現可能である。
FIG. 4 is a diagram conceptually explaining a high initial value, and is a distance from the sending point (system power supply G) when K = 0, K = 0.5, and K = 1. The initial value of the voltage corresponding to each is shown. As shown in the figure, the coefficient K is set appropriately, and the product of the difference ΔV between the voltage at each point and the sending voltage V s and the coefficient K is added to the sending voltage V s to obtain the voltage at each point on the system. A new initial value can be obtained.
Note that FIG. 5 is a diagram conceptually showing the initial voltage value at the time of the previous power flow calculation, the newly set higher initial value, and the lower initial value.
The above-mentioned calculation / change of the new initial value and determination of convergence and divergence of the calculation can be easily realized by the calculation process of the power flow calculation unit 12.

図3に戻って、高めの初期値を用いて潮流計算(ステップS6)を行った結果、未だに計算が発散する場合には、ステップS6とは逆に初期値を低めに設定して再度、潮流計算を行う(ステップS8,S10)。
また、低めの初期値を用いて潮流計算(ステップS7)を行った結果、未だに計算が発散する場合には、ステップS7とは逆に初期値を高めに設定して再度、潮流計算を行う(ステップS9,S11)。
その後、終了時間になったか否かを判断し、終了時間になっていなければ、系統内で時間により変化する値(例えば、太陽光発電装置PVの有効電力PPV,t,無効電力QPV,tからなる発電情報と、需要家Loadの有効電力PLoad,t,無効電力QLoad,tからなる負荷情報等)を変更し、ステップS1からの処理を繰り返し実行する(ステップS12 NO,S13)。
Returning to FIG. 3, if the calculation still diverges as a result of performing the tidal current calculation (step S6) using a higher initial value, set the initial value lower and again the tidal current, contrary to step S6. Calculation is performed (steps S8 and S10).
If the calculation still diverges as a result of performing the tidal current calculation (step S7) using a lower initial value, the initial value is set higher and the tidal current calculation is performed again, contrary to step S7 (step S7). Steps S9, S11).
After that, it is determined whether or not the end time has been reached, and if it has not reached the end time, a value that changes with time in the system (for example, active power PPV, t , reactive power QPV, of the photovoltaic power generation device PV , The power generation information consisting of t and the active power P Road, t of the consumer Load, the load information consisting of the reactive power Q Road, t, etc.) are changed, and the processing from step S1 is repeatedly executed (steps S12 NO, S13). ..

なお、図3に示したフローチャートでは、高めの初期値と低めの初期値とを用いる2通りの場合につき潮流計算を行っているが、発散しやすい電力系統の場合には、係数Kを0~1の範囲で細かく変更する等の方法により、高めから低めまで段階的に多数の初期値を設定して潮流計算を行っても良い。
また、この実施形態では、電力系統の各点における電圧等の初期値を変更する場合について説明したが、分散型電源や負荷の定格動作時の有効電力と無効電力との和の初期値を変更して連続潮流計算を行っても良い。
In the flowchart shown in FIG. 3, the tidal current is calculated for two cases using a high initial value and a low initial value, but in the case of a power system that tends to diverge, the coefficient K is set to 0 to 0. A large number of initial values may be set stepwise from high to low and the power flow calculation may be performed by a method such as finely changing in the range of 1.
Further, in this embodiment, the case of changing the initial value of the voltage or the like at each point of the power system has been described, but the initial value of the sum of the active power and the reactive power at the rated operation of the distributed power source or the load is changed. Then, continuous power flow calculation may be performed.

G:系統電源
SVR:自動電圧調整器
F:配電線
PV:太陽光発電装置
Load:需要家
~N:ノード
10: 電子計算装置(PC)
11:データ入力部
12:潮流計算部
13:データ出力部
G: System power supply SVR: Automatic voltage regulator F: Distribution line PV: Photovoltaic power generation device Road: Consumer N 1 to N 4 : Node 10: Electronic computing device (PC)
11: Data input unit 12: Power flow calculation unit 13: Data output unit

Claims (5)

電子計算装置のハードウェア及びソフトウェアにより構成される電力潮流計算装置であって、
分散型電源を有する電力系統の設備情報、前記電力系統の発電量,負荷量を含む発電・負荷情報が入力されるデータ入力部と、前記設備情報及び前記発電・負荷情報に基づいて前記電力系統の各点における電圧及び有効電力・無効電力を計算する潮流計算部と、前記潮流計算部による計算結果を出力するデータ出力部と、を備え、
前記潮流計算部は、
計算の発散・収束を判定する判定手段と、少なくとも前記電力系統の各点における電圧、電流または電力潮流の何れかの初期値を変更する初期値変更手段と、を有し、前記判定手段により計算の発散を判定した場合には前記判定手段により計算の収束が判定されるまで、前記初期値変更手段により前記初期値を変更して再計算を行う機能を備え、
前記初期値変更手段は、
前記分散型電源の発電量が最大で負荷の需要量が最小である時の前記電力系統の各点における電圧と前記電力系統の送り出し電圧との差分と、所定の係数との積を求め、この積を前記送り出し電圧に加算した値を前記各点における電圧の初期値として設定することを特徴とする電力潮流計算装置。
It is a power flow calculation device composed of hardware and software of an electronic calculation device.
A data input unit for inputting equipment information of a power system having a distributed power source, power generation amount of the power system, and power generation / load information including the load amount, and the power system based on the equipment information and the power generation / load information. It is equipped with a power flow calculation unit that calculates the voltage and active power / invalid power at each point of the above, and a data output unit that outputs the calculation result by the power flow calculation unit.
The tidal current calculation unit
It has a determination means for determining divergence / convergence of calculation and an initial value changing means for changing at least an initial value of voltage, current, or power flow at each point of the power system, and is calculated by the determination means. When the divergence of the above is determined, the determination means has a function of changing the initial value and recalculating until the determination of convergence of the calculation is determined.
The initial value changing means is
The product of the difference between the voltage at each point of the power system and the output voltage of the power system when the power generation amount of the distributed power source is the maximum and the demand amount of the load is the minimum, and a predetermined coefficient is obtained. A power flow calculation device, characterized in that a value obtained by adding a product to the sending voltage is set as an initial value of a voltage at each of the points .
電子計算装置のハードウェア及びソフトウェアにより構成される電力潮流計算装置であって、
分散型電源を有する電力系統の設備情報、前記電力系統の発電量,負荷量を含む発電・負荷情報が入力されるデータ入力部と、前記設備情報及び前記発電・負荷情報に基づいて前記電力系統の各点における電圧及び有効電力・無効電力を計算する潮流計算部と、前記潮流計算部による計算結果を出力するデータ出力部と、を備え、
前記潮流計算部は、
計算の発散・収束を判定する判定手段と、少なくとも前記電力系統の各点における電圧、電流または電力潮流の何れかの初期値を変更する初期値変更手段と、を有し、前記判定手段により計算の発散を判定した場合には前記判定手段により計算の収束が判定されるまで、前記初期値変更手段により前記初期値を変更して再計算を行う機能を備え、
前記初期値変更手段は、
前記分散型電源の発電量が最大で負荷の需要量が最小である時の前記電力系統の各点における電流或いは電力潮流を潮流計算により求め、この電流或いは電力潮流と所定の係数との積を前記各点における電流或いは電力潮流の初期値として設定することを特徴とする電力潮流計算装置。
It is a power flow calculation device composed of hardware and software of an electronic calculation device.
A data input unit for inputting equipment information of a power system having a distributed power source, power generation amount of the power system, and power generation / load information including the load amount, and the power system based on the equipment information and the power generation / load information. It is equipped with a power flow calculation unit that calculates the voltage and active power / invalid power at each point of the above, and a data output unit that outputs the calculation result by the power flow calculation unit.
The tidal current calculation unit
It has a determination means for determining divergence / convergence of calculation and an initial value changing means for changing at least an initial value of voltage, current, or power flow at each point of the power system, and is calculated by the determination means. When the divergence of the above is determined, the determination means has a function of changing the initial value and recalculating until the determination of convergence of the calculation is determined.
The initial value changing means is
The current or power flow at each point of the power system when the power generation amount of the distributed power source is the maximum and the demand amount of the load is the minimum is obtained by power flow calculation, and the product of this current or power flow and a predetermined coefficient. Is set as an initial value of the current or the power flow at each of the above points .
電子計算装置のハードウェア及びソフトウェアにより構成される電力潮流計算装置であって、
分散型電源を有する電力系統の設備情報、前記電力系統の発電量,負荷量を含む発電・負荷情報が入力されるデータ入力部と、前記設備情報及び前記発電・負荷情報に基づいて前記電力系統の各点における電圧及び有効電力・無効電力を計算する潮流計算部と、前記潮流計算部による計算結果を出力するデータ出力部と、を備え、
前記潮流計算部は、
計算の発散・収束を判定する判定手段と、少なくとも前記電力系統の各点における電圧、電流または電力潮流の何れかの初期値を変更する初期値変更手段と、を有し、前記判定手段により計算の発散を判定した場合には前記判定手段により計算の収束が判定されるまで、前記初期値変更手段により前記初期値を変更して再計算を行う機能を備え、
前記初期値変更手段は、
前記分散型電源の発電量が最で負荷の需要量が最である時の前記電力系統の各点における電圧と前記電力系統の送り出し電圧との差分と、所定の係数との積を求め、この積を前記送り出し電圧に加算した値を前記各点における電圧の初期値として設定することを特徴とする電力潮流計算装置。
It is a power flow calculation device composed of hardware and software of an electronic calculation device.
A data input unit for inputting equipment information of a power system having a distributed power source, power generation amount of the power system, and power generation / load information including the load amount, and the power system based on the equipment information and the power generation / load information. It is equipped with a power flow calculation unit that calculates the voltage and active power / invalid power at each point of the above, and a data output unit that outputs the calculation result by the power flow calculation unit.
The tidal current calculation unit
It has a determination means for determining divergence / convergence of calculation and an initial value changing means for changing at least an initial value of voltage, current, or power flow at each point of the power system, and is calculated by the determination means. When the divergence of the above is determined, the determination means has a function of changing the initial value and recalculating until the determination of convergence of the calculation is determined.
The initial value changing means is
The product of the difference between the voltage at each point of the power system and the output voltage of the power system when the power generation amount of the distributed power source is the minimum and the demand amount of the load is the maximum , and a predetermined coefficient. A power flow calculation device characterized in that a value obtained by obtaining and adding this product to the sending voltage is set as an initial value of a voltage at each of the points .
電子計算装置のハードウェア及びソフトウェアにより構成される電力潮流計算装置であって、
分散型電源を有する電力系統の設備情報、前記電力系統の発電量,負荷量を含む発電・負荷情報が入力されるデータ入力部と、前記設備情報及び前記発電・負荷情報に基づいて前記電力系統の各点における電圧及び有効電力・無効電力を計算する潮流計算部と、前記潮流計算部による計算結果を出力するデータ出力部と、を備え、
前記潮流計算部は、
計算の発散・収束を判定する判定手段と、少なくとも前記電力系統の各点における電圧、電流または電力潮流の何れかの初期値を変更する初期値変更手段と、を有し、前記判定手段により計算の発散を判定した場合には前記判定手段により計算の収束が判定されるまで、前記初期値変更手段により前記初期値を変更して再計算を行う機能を備え、
前記初期値変更手段は、
前記分散型電源の発電量が最小で負荷の需要量が最大である時の前記電力系統の各点における電流或いは電力潮流を求め、この電流或いは電力潮流と所定の係数との積を前記各点における電流或いは電力潮流の初期値として設定することを特徴とする電力潮流計算装置。
It is a power flow calculation device composed of hardware and software of an electronic calculation device.
A data input unit for inputting equipment information of a power system having a distributed power source, power generation amount of the power system, and power generation / load information including the load amount, and the power system based on the equipment information and the power generation / load information. It is equipped with a power flow calculation unit that calculates the voltage and active power / invalid power at each point of the above, and a data output unit that outputs the calculation result by the power flow calculation unit.
The tidal current calculation unit
It has a determination means for determining divergence / convergence of calculation and an initial value changing means for changing at least an initial value of voltage, current, or power flow at each point of the power system, and is calculated by the determination means. When the divergence of the above is determined, the determination means has a function of changing the initial value and recalculating until the determination of convergence of the calculation is determined.
The initial value changing means is
The current or power flow at each point of the power system when the power generation amount of the distributed power source is the minimum and the demand amount of the load is the maximum is obtained, and the product of this current or power flow and a predetermined coefficient is calculated as described above. A power flow calculation device characterized in that it is set as an initial value of a current or a power flow at a point .
請求項1~4の何れか1項に記載した電力潮流計算装置において、
前記初期値変更手段により初期値を変更して前記潮流計算部が計算した結果を新たな初期値として、前記潮流計算部が所定の時間ごとに連続して潮流を計算することを特徴とする電力潮流計算装置。
In the power flow calculation device according to any one of claims 1 to 4 .
The power is characterized in that the power flow calculation unit continuously calculates the power flow at predetermined time intervals by changing the initial value by the initial value changing means and using the result calculated by the power flow calculation unit as a new initial value. Power flow calculation device.
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WO2014207848A1 (en) 2013-06-26 2014-12-31 三菱電機株式会社 Voltage monitoring control device, and voltage monitoring control method
WO2015079554A1 (en) 2013-11-29 2015-06-04 株式会社日立製作所 Device for estimating state of power grid, state estimation method thereof, and power grid control system
WO2017033881A1 (en) 2015-08-26 2017-03-02 東京電力ホールディングス株式会社 Power-distribution-system monitoring system and control method for power-distribution-system monitoring system
JP2017184364A (en) 2016-03-29 2017-10-05 株式会社日立製作所 Distributed power supply controller and distributed power supply control method
JP6245396B1 (en) 2017-04-19 2017-12-13 富士電機株式会社 Tidal current calculation device, tidal current calculation method, and tidal current calculation program

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014207848A1 (en) 2013-06-26 2014-12-31 三菱電機株式会社 Voltage monitoring control device, and voltage monitoring control method
WO2015079554A1 (en) 2013-11-29 2015-06-04 株式会社日立製作所 Device for estimating state of power grid, state estimation method thereof, and power grid control system
WO2017033881A1 (en) 2015-08-26 2017-03-02 東京電力ホールディングス株式会社 Power-distribution-system monitoring system and control method for power-distribution-system monitoring system
JP2017184364A (en) 2016-03-29 2017-10-05 株式会社日立製作所 Distributed power supply controller and distributed power supply control method
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