JP6398439B2 - Operation plan generation device, operation plan generation method and program - Google Patents

Description

  The present invention relates to an operation plan generation device, an operation plan generation method, and a program.

  Electricity demand changes from moment to moment depending on various factors such as the season, time of day, day of the week, etc., but if the balance between electricity demand and supply is disrupted, power system frequency and voltage changes, power outages, etc. occur and are stable. Troubles in the supply of power.

  Therefore, it is important to control the power system so that power demand is accurately predicted and the balance between supply and demand is maintained.

  When determining the amount of operation for power system components (generator output, node voltage, phase-control facility operation amount, etc.), optimal tidal current calculation is used as a technique for considering economy and reliability. ing. The optimum power flow calculation is a method of calculating the operation amount of each component so that the power generation cost and power transmission loss of the generator are minimized while maintaining the operation restrictions of the power system.

  When operating conditions such as power generation cost and transmission loss are given as objective functions, operating constraints of the power system are given as constraints, and the amount of operation for the operation target device is given as a state variable, the optimal power flow calculation is an optimization problem with constraints. (For example, refer to Patent Document 1 and Non-Patent Document 1).

  In recent years, with the spread of distributed power sources using renewable energy such as sunlight and wind power, the use of storage batteries for power system control has been studied (see, for example, Patent Document 2). Patent Document 2 describes performing a so-called peak shift by a storage battery on an electric power system including a generator and a storage battery.

JP 2006-174564 A JP 2011-114945 A

Yuji Sekine and 6 other authors, "Optimal Power Flow Calculation for Electric Power System << OPF; Optimal Power Flow", NEC Corporation, March 2002

  However, when generating an operation plan for an electric power system including a storage battery as a constituent element, as described in Patent Document 2, the charging rate of the storage battery (hereinafter referred to as SOC: The storage battery SOC constraint that the state of charge (which is also referred to as “State of Charge”) is set to 50% is set, which is one of the causes for reducing the flexibility in generating the operation plan.

  The present invention has been made in view of such problems, and more appropriate power generation is possible when generating an operation plan for a power generation facility and a power storage facility in a power system configured to include the power generation facility, a load facility, and a power storage facility. An object is to provide an operation plan generation device, an operation plan generation method, and a program capable of generating operation plans for facilities and power storage facilities.

One of means for solving the above problem is an operation plan generation device that generates an operation plan of the power generation facility and the power storage facility in an electric power system configured to include a power generation facility, a load facility, and a power storage facility. , An objective function for calculating the power generation cost of the power generation facility, and an acquisition unit for acquiring a constraint condition regarding operation of the power generation facility and the power storage facility, and power consumption of the load facility during the target period of the operation plan An operation plan calculation unit that calculates an operation plan of the power generation facility and the power storage facility so as to minimize the value of the objective function while satisfying the constraint condition based on the predicted value of Is a first charging rate that is a charging rate of the power storage equipment at the start of the specific period in the target period, and a charging rate of the power storage equipment at the end of the specific period And second charging rate, differently, the included power storage charging rate constraints defining a charging rate of the equipment, the specific time period, day 1 or more days comprising only weekdays or holidays holidays in units of In the charging rate constraint condition, when the specific period consists only of weekdays, the charging rate of the power storage equipment is determined so that the second charging rate is smaller than the first charging rate. is, when the specific period is only rest holidays, the charging rate of the first charging rate the storage equipment as well becomes larger towards the second charging rate than that of Ru determined.

  In addition, the problems disclosed by the present application and the solutions thereof will be clarified by the description in the column of the embodiment for carrying out the invention and the description of the drawings.

  According to the present invention, it is possible to generate a more appropriate power system operation plan.

It is a figure which shows the hardware constitutions of an operation plan production | generation apparatus. It is a figure which shows the function structure of an operation plan production | generation apparatus. It is a figure which shows the memory | storage device of an operation plan production | generation apparatus. It is a figure which shows an electric power grid | system. It is a figure which shows a charging rate constraint condition. It is a flowchart which shows the flow of a process of an operation plan production | generation apparatus. It is a figure which shows the output result of an operation plan. It is a figure which shows the output result of an operation plan. It is a figure which shows a mode that an operation plan production | generation apparatus controls an electric power grid | system. It is a figure which shows a comparative example. It is a figure which shows a comparative example. It is a figure which shows a mode that the output result of the driving | operation plan was contrasted with the comparative example.

  At least the following matters will become apparent from the description of this specification and the accompanying drawings.

= Configuration of the operation plan generator =
As shown in FIG. 4, the operation plan generation apparatus 100 according to the present embodiment includes a generator 1 (G1) (also referred to as a power generation facility 1 (G1)), a generator 2 (G2) (a power generation facility 2 (G2)). A generator 1 in a power system 1000 configured by connecting a load L (also referred to as a load facility L), a solar power generator PV, and a storage battery B (also referred to as a storage facility B) via a transmission line T. G1), an apparatus for generating an operation plan for the generator 2 (G2) and the storage battery B.

  In FIG. 4, the generator 1 (G1) and the generator 2 (G2) are described. However, when it is not necessary to distinguish between them, they are collectively referred to as a generator G (power generation equipment G). .

  The power generation facility G is a power that can control the amount of power generation by controlling the amount of energy converted into electric power, such as a generator at a thermal power plant, a hydroelectric power plant, a nuclear power plant, or a diesel generator. It is a generation device.

  Moreover, the solar power generator PV is a power generation device in which the amount of solar energy used to be converted into electric power greatly depends on weather conditions and it is difficult to control the power generation amount.

  The power storage facility B is a device that can internally charge power generated by the power generation facility G and the solar power generator PV and discharge the power charged inside.

  The load facility L is a device that consumes electric power supplied from the power generation facility G, the solar power generator PV, and the power storage facility B via the power transmission line T.

  Although not shown in FIG. 4, the power system 1000 may include a phase adjusting equipment S, a transformer, a wind power generator, and the like in addition to the above-described components.

  Moreover, the operation plan production | generation apparatus 100 which concerns on this embodiment demonstrates as an example the case where the optimal power flow calculation is performed and the operation plan for 1 week of the power generation equipment G and the electrical storage equipment B is produced | generated. Of course, the generation target period of the operation plan is not limited to one week, and can be set as appropriate, such as one day, two days, or one month. Details will be described later.

  The whole structure of the operation plan production | generation apparatus 100 which concerns on this embodiment is shown in FIG.1 and FIG.2. FIG. 1 is a diagram for explaining a hardware configuration of the operation plan generation device 100, and FIG. 2 is a diagram for explaining a functional configuration of the operation plan generation device 100.

  As shown in FIG. 1, an operation plan generation device 100 according to the present embodiment includes a CPU (Central Processing Unit) 110, a memory 120, a communication device 130, a storage device 140, an input device 150, an output device 160, and a recording medium reading device. The computer is configured to include 170.

  The CPU 110 is responsible for overall control of the operation plan generation apparatus 100, and reads out and executes a control program 600 composed of codes for performing various operations according to the present embodiment stored in the storage device 140 to the memory 120. By doing so, various functions as the operation plan generation device 100 are realized.

  For example, although the details will be described later, the control program 600 is executed by the CPU 110, and the acquisition unit 101, the operation plan calculation unit 102, and the like are performed by cooperating with hardware devices such as the memory 120, the communication device 130, and the storage device 140. Realized.

  The memory 120 can be configured by a semiconductor memory device, for example.

  The communication device 130 is a network interface such as a network card. The communication device 130 receives data from another computer via a network such as the Internet or a LAN (Local Area Network), and stores the received data in the storage device 140 or the memory 120. Further, the communication device 130 transmits data stored in the storage device 140 or the memory 120 to another computer via the network.

  The input device 150 is a device such as a keyboard, a mouse, or a microphone, and is a device for accepting input of information by an operator of the operation plan generation device 100. The output device 160 is a device such as an LCD (Liquid Crystal Display), a printer, or a speaker, and is a device for outputting information.

  The storage device 140 can be constituted by, for example, a hard disk device or a semiconductor storage device. The storage device 140 is a device that provides a physical storage area for storing various programs, data, tables, and the like. FIG. 3 shows a state where the control program 600 and the data storage unit 700 are stored in the storage device 140.

  The control program 600 is stored in the operation plan generation device 100 by reading it from the recording medium (various optical disks, magnetic disks, semiconductor memory, etc.) 800 to the storage device 140 using the recording medium reader 170. It can also be stored in the operation plan generation device 100 by obtaining from another computer that is communicably connected via the communication device 130.

  The data storage unit 700 also includes an objective function and constraint conditions that are referred to by the operation plan calculation unit 102 described later, a predicted value of the power consumption of the load facility L every predetermined time, and a predetermined value of the power generation amount of the solar power generator PV. Predicted values and system data for each hour are stored.

  When the wind power generator is included in the power system 1000, the data storage unit 700 also stores a predicted value for each predetermined time of the power generation amount of the wind power generator.

  The system data includes, for example, the line impedance of the transmission line T, the active power and reactive power of the load L, the fuel cost coefficient of the generator G (index such as yen / kWh), the active power and reactive power of the generator G, the storage battery B Including active power and reactive power, capacity of phase adjusting equipment S, upper and lower limit values for node voltage, and the like.

  Next, as illustrated in FIG. 2, the operation plan generation device 100 according to the present embodiment includes the functional blocks of an acquisition unit 101 and an operation plan calculation unit 102.

  The acquisition unit 101 inputs an objective function for calculating the power generation cost of the power generation equipment G and the constraint conditions related to the operation of the power generation equipment G and the power storage equipment B, which are used when the operation plan generation device 100 performs the optimal power flow calculation. Obtained from the device 150 or the communication device 130 and stored in the data storage unit 700.

  In addition, the operation plan generation device 100 is configured to predict the power consumption of the load facility L during a target period of the operation plan (in this embodiment, for example, one week) every predetermined time (for example, every hour), a solar power generator, The prediction value of PV power generation amount every predetermined time and the system data are acquired from the input device 150 or the communication device 130 and stored in the data storage unit 700.

  When the wind power generator is included in the power system 1000, the operation plan generation device 100 also acquires a predicted value of the power generation amount of the wind power generator every predetermined time and stores it in the data storage unit 700.

  The operation plan calculation unit 102 predicts the power consumption of the load facility L during the target period of the operation plan every predetermined time, the predicted value of the power generation amount of the solar power generator PV every predetermined time, system data, and power When the system 1000 includes a wind power generator, the power generation equipment G and the power storage that minimize the value of the objective function while satisfying the constraint condition based on the predicted value of the power generation amount of the wind power generator every predetermined time The operation plan for the facility B is calculated.

  That is, the operation plan calculation unit 102 uses the objective function and the constraint condition to calculate the operation amount, the voltage solution, and other dependent variables so that the operation state of the power system 1000 becomes a more optimal state. The operation plan calculation unit 102 calculates an optimal solution by performing an optimal power flow calculation using an optimization method such as mathematical programming.

  In the following description, the case where the wind power generator is included in the power system 1000 is not particularly described, but the operation plan generation device 100 according to the present embodiment is configured when the power system 1000 includes a wind power generator. The operation plan of the power generation equipment G and the power storage equipment B is calculated using the predicted value of the power generation amount of the wind power generator every predetermined time.

  Then, the optimal power flow calculation which the operation plan production | generation apparatus 100 which concerns on this embodiment performs is demonstrated. The operation plan generation device 100 performs optimal power flow calculation by solving an optimization problem given as a nonlinear optimization problem as in Expressions (1) to (4).

Minimize f (x, u, z) (1)
Subject to g ₁ (x, u, z) = 0 (2)
g ₂ (x, u, z) = 0 (3)
h (x, u, z) ≦ 0 (4)
Here, x is a voltage solution, u is an operation amount, and z is a variable (such as a reactive power of the generator G or a transformer tap value) that is dependent on the operation amount.

  Equation (1) is an objective function, Equation (2) is an equational constraint expressed by a tidal equation, Equation (3) is an equation constraint other than the tidal equation (transformer characteristics, SVC (Static Var Compensator), etc. (Logic) and equation (4) are inequality constraints (specified value of voltage, power flow value of transmission line T, etc.).

  The operation plan generation apparatus 100 according to the present embodiment performs optimal power flow calculation for a nonlinear optimization problem given as in Expression (1) to Expression (4) by a method such as mathematical programming.

  Note that the power flow equation is given in Equation (2). The power flow equation is based on a circuit equation in which the supply or consumption of active power and reactive power specified at each node in the power system 1000 is composed of the voltage and line impedance of each node. It means that the obtained active power and reactive power coincide with each other.

<Objective function>
The objective function for calculating the power generation cost of the active power output of the generator G is formulated as, for example, the following formula (5).

ここで、Gi（i=1〜n）は発電機番号、Gnは発電機の数、P_Gi(t)は時刻tにおける発電機Giの有効電力出力値、a_Gi、b_Gi、c_Giは発電機Giの有効電力P_Gi(t)と発電コストFcostの関係を示す係数である。発電コストFcostは、発電機Giの有効電力出力P_Gi(t)の二次関数で近似されるため、このような定式化が行われる。

Here, Gi (i = 1 to n) is the generator number, Gn is the number of generators, P _Gi (t) is the active power output value of the generator Gi at time t, a _Gi , b _Gi , c _Gi are This is a coefficient indicating the relationship between the active power P _Gi (t) of the generator _Gi and the power generation cost Fcost. Since the power generation cost Fcost is approximated by a quadratic function of the active power output P _Gi (t) of the generator Gi, such a formulation is performed.

<Restrictions>
Next, the constraint conditions will be described. As described above, the constraint conditions include equality constraints and inequality constraints. In this embodiment, a tidal equation is included as an example of equality constraints, and examples of inequality constraints include upper and lower limit constraints on voltage, power flow constraints on the transmission line T, facility capacity constraints, and the like.

  The tidal current equation is expressed by, for example, Expressions (6) and (7). Equation (6) is a power flow equation relating to the active power component, and Equation (7) is a power flow equation relating to the reactive power component.

ここで、Giは発電機番号、P_Gi(t)は時刻tにおけるGi発電機の有効電力出力値、Biは蓄電池番号、P_Bi(t)は時刻tにおける蓄電池Biの有効電力出力値、Liは負荷番号、P_Li(t)は時刻tにおける負荷Liの有効電力消費量、Q_Gi(t)は時刻tにおける発電機Giの無効電力出力値、Q_Bi(t)は時刻tにおける蓄電池Biの無効電力出力値、Q_Li(t)は時刻tにおける負荷Liの無効電力消費量、θi(t)、θj(t)は、それぞれ時刻tにおけるノードi、jの位相角の値である。

Here, Gi is the generator number, P _Gi (t) is the active power output value of the Gi generator at time t, Bi is the storage battery number, P _Bi (t) is the active power output value of the storage battery Bi at time t, Li Is the load number, P _Li (t) is the active power consumption of load Li at time t, Q _Gi (t) is the reactive power output value of generator Gi at time t, and Q _Bi (t) is storage battery Bi at time t The reactive power output value of Q i, Q _Li (t) is the reactive power consumption of load Li at time t, and θ i (t) and θ j (t) are the values of the phase angles of nodes i and j at time t, respectively.

  Vi (t) and Vj (t) are voltage amplitude values of nodes i and j at time t, respectively. Gij (t) and Bij (t) are the real part and the imaginary part of i rows and j columns of the admittance matrix of the power system at time t, respectively.

  In addition, when considering a transformer tap and a phase-adjustment installation capacity, an admittance matrix becomes a function which uses a transformer tap and a phase-adjustment installation capacity as a variable.

  The power flow restriction of the power transmission line T is expressed as, for example, Expression (8).

ここで、θi(t)、θj(t)は、それぞれ時刻tにおけるノードi、jの位相角の値である。Vi(t)、Vj(t)は、それぞれ時刻tにおけるノードi、jの電圧振幅の値である。Gij(t)、Bij(t)はそれぞれ時刻tにおける電力系統のアドミタンス行列のi行j列の実部と虚部である。また、線路熱容量の定格値をP_Rとする。

Here, θi (t) and θj (t) are the values of the phase angles of the nodes i and j at time t, respectively. Vi (t) and Vj (t) are voltage amplitude values of nodes i and j at time t, respectively. Gij (t) and Bij (t) are the real part and the imaginary part of i rows and j columns of the admittance matrix of the power system at time t, respectively. Also, the rated value of the line capacity and P _R.

Further, the upper and lower limit constraints of the voltage amplitude V _i (t) are expressed as, for example, Expression (9). The upper and lower limit constraints on the voltage amplitude V _i (t) are constraints for maintaining the voltage amplitude of each node within a predetermined range.

ただし、V_Liは電圧の下限値、V_Uiは電圧の上限値である。

However, V _Li is the lower limit value of the voltage, and V _Ui is the upper limit value of the voltage.

  In addition, regarding various constraints such as upper and lower limits of equipment capacity and rate of change, these can be given as equipment capacity restrictions. The equipment capacity constraints include, for example, the following constraints (a) to (j).

(A) Active power output value upper / lower limit constraint of generator G (b) Reactive power output value upper / lower limit constraint of generator G (c) Effective power output change rate upper / lower limit constraint of generator G (d) Effectiveness of storage battery B Power output value upper and lower limit constraints (e) Reactive power output value upper and lower limit constraints for storage battery B (f) SOC upper and lower limit constraints for storage battery B (g) Phased equipment capacity upper and lower limit constraints (h) Transformer tap fluctuation range upper and lower limit constraints (I) Transformer phase shift angle upper and lower limit constraints (j) SOC of storage battery B during operation plan generation target period (also referred to as charge rate constraint condition).

  The charge rate constraint condition shown in (j) above is the charge rate SOC of the storage battery B at the start and end points of a specific period (for example, 1 day) during the operation plan generation target period (for example, 1 week in the present embodiment). It is a defined constraint.

  Specifically, the charging rate constraint condition includes the first charging rate that is the charging rate of the storage battery B at the start time (for example, a predetermined time) of the specific period in the target period of the operation plan, and the end time (for example, the next day). And the second charging rate, which is the charging rate of the storage battery B at the same time).

  Hereinafter, the charging rate constraint condition according to the present embodiment will be described with reference to a specific example.

  FIG. 5 shows that when the target period of the operation plan is set to one week (Monday to Sunday) and seven specific periods are set so as to correspond to each day of the week, The example of the charge rate constraint condition which set the charge rate of the storage battery B in the start time and the end time is shown.

  The charging rate constraint condition is that the charging rate (first charging rate) of the storage battery B at the start of Monday (0 o'clock on Monday) is 50%, and the charging rate of the storage battery B at the end of Monday (24:00 on Monday) The (second charging rate) is specified to be 45%.

  Similarly, the charging rate constraint condition is that the charging rate (first charging rate) of the storage battery B at the start time of Tuesday (= the end time of Monday) is 45%, and the charging rate (the first charging rate of the storage battery B at the end time of Tuesday) 2 charge rate) is 40%.

  Further, similarly, the charging rate constraint condition is that the charging rate (first charging rate) of the storage battery B at the start of Sunday is 35%, and the charging rate (second charging rate) of the storage battery B at the end of Sunday is 50. % Is stipulated.

  In the present embodiment, as shown in FIG. 5, each day from Monday to Friday is illustrated as a weekday, and Saturday and Sunday as a holiday, but the day of the week, the weekday, and the holiday The correspondence relationship is not limited to a specific relationship.

  For example, if any day from Monday to Friday is a national holiday, that day may be a holiday, not a weekday.

  Further, for example, when the power grid 1000 according to the present embodiment is a power grid 1000 operated in a certain company, the operating day of the company is set as a weekday regardless of the day of the week, and the non-operating day is set. It may be a holiday.

  In other words, in the present embodiment, it is only necessary to distinguish between a day with a relatively large amount of power usage and a day with a small amount of power usage within a target period (for example, one week) of the operation plan. Assuming that weekdays are assumed, holidays are only assumed as few days.

  Next, a method for setting the charging rate of the storage battery B under the charging rate constraint condition according to the present embodiment will be described.

<First method>
In the first method, the operation plan generation device 100 determines the SOC of the charge rate constraint condition from the ratio of the daily daily power amount (the daily total value of the predicted value of power consumption). That is, the operation plan generation device 100 calculates the ratio of the daily power amount for each day of the week from the load data for one week (predicted value of power consumption), and determines the SOC of the charging rate constraint condition from these ratios. Note that when calculating the ratio of the daily power amount for each day of the week, the operation plan generating device 100 calculates it separately for weekdays and holidays.

  Specifically, the operation plan generation device 100 calculates the ratio of the daily power amount between each day of the week on weekdays. The ratio of the daily power amount between weekdays is a coefficient normalized so that the total power amount on weekdays is 1.

  In addition, the operation plan generation device 100 calculates the ratio of the daily power amount between each day of the holiday. The ratio of the daily power amount during each day of the holiday is a coefficient normalized so that the total power amount during the holiday becomes 1.

  Then, the operation plan generation device 100 sets the lower limit value of the SOC to the SOC target value at the end of the plan on Friday.

  Then, the operation plan generation device 100 calculates the daily SOC target value based on the daily power amount ratio of each day on weekdays and the daily power amount ratio of each day on holidays.

  The above process will be described using mathematical formulas.

_Let P _L1 , P _L2 ,... P _{L7 be} the daily electric energy for each day of the week. Also, the SOC at the start of the weekly plan (at the start of Monday) is SOC ₀ , the SOC at the end of the weekly plan (at the end of Sunday) is SOC _7, and the upper and lower limits of the SOC are SOC _max and SOC _min . These values are assumed to be given in advance.

The ratio between each day of weekday days power amount K _1, K _2, ... When _{K 5, K 1, K 2} , ... K 5 can be expressed by equation (10) to (14).

K ₁ = P _L1 / (P _L1 + P _L2 +… + P _L5 ) (10)
K ₂ = P _L2 / (P _L1 + P _L2 +… + P _L5 ) (11)
K ₃ = P _L3 / (P _L1 + P _L2 +… + P _L5 ) (12)
K ₄ = P _L4 / (P _L1 + P _L2 +… + P _L5 ) (13)
K ₅ = P _L5 / (P _L1 + P _L2 +… + P _L5 ) (14)
However, K ₁ + K ₂ + K ₃ + K ₄ + K ₅ = 1.

Further, assuming that the ratio of daily power consumption on holidays is between K ₆ and K ₇ , K ₆ and K ₇ are calculated by the equations (15) and (16).

K ₆ = P _L6 / (P _L6 + P _L7 ) (15)
K ₇ = P _L7 / (P _L6 + P _L7 ) (16)
However, K ₆ + K ₇ = 1.

  Also, the SOC target value at the end of the plan on Friday is given by equation (17).

SOC ₅ = SOC _min (17)
And, (SOC ₇ from SOC ₁₎ SOC target value at the time of every day of the plan termination (at the end of each day from Monday Sunday), using the ratio K ₁ ... K ₇ days the amount of power between each day of the week, the formula ( 18) to (24).

  And the driving | operation plan production | generation apparatus 100 memorize | stores the SOC target value of each day calculated by Formula (18)-(24) in the data memory | storage part 700 as a charging rate constraint condition.

SOC ₁ = SOC ₀ −K ₁ (SOC ₀ −SOC _min ) (18)
SOC ₂ = SOC ₁ −K ₂ (SOC ₀ −SOC _min ) (19)
SOC ₃ = SOC ₂ −K ₃ (SOC ₀ −SOC _min ) (20)
SOC ₄ = SOC ₃ −K ₄ (SOC ₀ −SOC _min ) (21)
SOC ₅ = SOC ₄ −K ₅ (SOC ₀ −SOC _min ) (22)
SOC ₆ = SOC ₅ + K ₆ (SOC ₇ −SOC _min ) (23)
SOC ₇ = SOC ₆ + K ₇ (SOC ₇ −SOC _min ) (24)
However, as described above, K ₁ + K ₂ + K ₃ + K ₄ + K ₅ = 1 and K ₆ + K ₇ = 1.

Note that Equation (22) and Equation (24) are shown for ease of understanding, but the SOC target value at the end of the plan on Friday is given in advance by Equation (17). The SOC target value SOC ₇ at the end of the plan is also given in advance. Since the values calculated using the equations (22) and (24) are the same as the values given in advance, the calculation need not be performed.

  By calculating as described above, the operation plan generation device 100, when the specific period within the operation plan generation target period is a weekday, the first charge rate that is the charge rate at the start of the specific period, The difference from the second charging rate, which is the charging rate at the end point, is a value corresponding to the ratio between the total value of power consumption for all weekdays in the target period and the total value of power consumption for the specific period. The value of a 1st charging rate and a 2nd charging rate is defined so that it may become.

  In addition, when the specific period is a holiday, the operation plan generation device 100 determines that the difference between the first charge rate and the second charge rate in the specific period is the total power consumption amount on all holidays in the target period. And the value of a 1st charging rate and a 2nd charging rate is defined so that it may become a value according to the ratio of the total value of the power consumption in the said specific period.

<Second method>
In the second method, the operation plan generation device 100 performs the optimization calculation so as to minimize the objective function for obtaining the power generation cost of the generator G while satisfying the constraint condition, thereby generating the operation plan generation target period. Calculate the SOC target value for each day in

  In this case, the operation plan generation device 100 considers one day as one point in time, performs optimization calculation in a week, and calculates the SOC target value.

  The operation plan generation device 100 performs optimization calculation using equations (25) to (28).

  The objective function representing the power generation cost of the active power output of the generator G is expressed as shown in Equation (25), for example.

ここで、Gi(i=1〜n)は発電機番号、Gnは発電機Ｇの数、P_Gi(x)は日付xにおける発電機Giの日間での有効電力出力量、a_Gi、b_Gi、c_Giは発電機Giの有効電力と発電コストの関係を示す係数である。発電コストは、発電機Ｇの有効電力出力の二次関数で近似されるため、式（２５）のような定式化が行われる。

Here, Gi (i = 1 to n) is the generator number, Gn is the number of generators G, P _Gi (x) is the effective power output amount of the generator Gi on the date x, a _Gi , b _Gi , C _Gi is a coefficient indicating the relationship between the active power of the generator Gi and the power generation cost. Since the power generation cost is approximated by a quadratic function of the active power output of the generator G, a formulation such as Expression (25) is performed.

  Next, the constraint conditions will be described. Of the constraint conditions, the equality constraint is a supply-demand balance constraint, and the inequality constraint is a facility capacity constraint.

  The supply and demand balance constraint is expressed as, for example, Expression (26).

ただし、Giは発電機番号、P_Gi(x)は日付xにおける発電機Giの日間での有効電力出力量、Biは蓄電池番号、P_Bi(x)は日付xにおける蓄電池Biの日間での有効電力出力量、Liは負荷番号、 P_Li(t)は日付xにおける負荷Liの日電力量である。

However, Gi is the generator number, P _Gi (x) is the effective power output amount of the generator Gi on the date x, Bi is the storage battery number, P _Bi (x) is the effective date of the storage battery Bi on the date x The power output amount, Li is the load number, and P _Li (t) is the daily power amount of the load Li at the date x.

  The facility capacity restriction is expressed by, for example, the equations (27) and (28).

ただし、P_GiMINは日間での発電機Ｇの有効電力出力量の下限値、P_GiMAXは日間での発電機Ｇの有効電力出力量の上限値である。

However, P _GiMIN is a lower limit value of the effective power output amount of the generator G in the day, and P _GiMAX is an upper limit value of the active power output amount of the generator G in the day.

ただし、SOC_BiMINは蓄電池ＢのSOCの下限値、SOC_BiMAXは蓄電池ＢのSOCの上限値である。

Here, SOC _BiMIN is a lower limit value of the SOC of the storage battery B, and SOC _BiMAX is an upper limit value of the SOC of the storage battery B.

  Further, the SOC value of the storage battery B at the start of the weekly plan (for example, at the start of Monday) and at the end of the weekly plan (for example, at the end of Sunday) is incorporated as a constraint that is determined in advance.

  The operation plan generation device 100 can calculate the SOC target value for each day within the operation plan generation target period by creating the above objective function and constraint conditions and performing optimization calculation.

  And the driving | operation plan production | generation apparatus 100 memorize | stores the SOC target value of each day in the data storage part 700 as a charging rate constraint condition.

= Flow of processing =
Next, the operation plan generation device 100 according to the present embodiment performs optimal power flow calculation so as to minimize the objective function related to the power generation cost Fcost while satisfying various constraint conditions including the charge rate constraint condition shown in FIG. FIG. 6 is a flowchart showing the flow of processing in the case of performing it.

  First, the operation plan generation apparatus 100 obtains, from the data storage unit 700, an hourly predicted value of power consumption of the load facility L, an hourly predicted value of power generation from the solar power generator PV, and system data. Obtain (S1000). These predicted values are calculated in advance using various weather forecasts and past performance data.

  Next, the operation plan generation apparatus 100 acquires from the data storage unit 700 the objective function for obtaining the power generation cost Fcost of the power generation facility G and the constraint conditions regarding the operation of the power generation facility G and the power storage facility B (S1010).

  Then, the operation plan generation apparatus 100 performs an optimal power flow calculation and generates an operation plan for the power generation equipment G and the power storage equipment B for one week that minimizes the objective function while satisfying the constraint conditions (S1020).

  Then, the operation plan generation device 100 outputs the generated operation plan to the output device 160 or the communication device 130 (S1030).

= Operation plan =
In this way, the operation plan generation device 100 according to the present embodiment generates for one week generated so as to minimize the objective function related to the power generation cost Fcost while satisfying the constraint conditions including the charge rate constraint condition shown in FIG. The operation plan is shown in FIGS.

  “Load effective power” illustrated in FIG. 7 represents a predicted value of the power consumption of the load facility L every predetermined time.

  Similarly, the “solar power generator” described in FIG. 7 is a power generation amount per predetermined time from the solar power generator PV calculated in advance using various weather forecasts and past power generation results. It is a predicted value.

  As shown in FIG. 7, the operation plan generation device 100 performs the optimum power flow calculation so as to minimize the power generation cost Fcost of the generator G1 and the generator G2, and as a result, on each day from Monday to Friday on weekdays, During the time of the day when the “load effective power” is relatively low (midnight), the generator G1 generates power exceeding the “load effective power” and charges the storage battery B with surplus power. The electric power charged in the storage battery B is discharged during a time period (daytime) when the “load effective power” is relatively high in one day, and the generator G1 and the generator G2 An operation plan to reduce the amount of power generation is generated. Therefore, the operation of the generator G1 is leveled, the power generation amount of the generator G1 and the generator G2 can be suppressed as a whole, and the generator G1 and the generator G2 can be efficiently operated. Become.

  Moreover, as shown in FIG. 8, the operation plan production | generation apparatus 100 is producing | generating the operation plan of the storage battery B of each day so that the charging rate constraint conditions shown in FIG. 5 may be satisfy | filled.

  Specifically, the operation plan generation device 100 has a second charge rate at the end time on each day from Monday to Friday on weekdays rather than the first charge rate that is the charge rate of the storage battery B at the start time of each day. The operation plan of the storage battery B is generated so that becomes smaller.

  In addition, the operation plan generation device 100 causes the second charge rate at the end time to be larger than the first charge rate that is the charge rate of the storage battery B at the start time of each day on Saturdays and Sundays of holidays. The operation plan of the storage battery B is generated.

  As described above, the operation plan generation apparatus 100 according to the present embodiment considers the fluctuation characteristics of the load active power for one week, and the storage battery B at the final time of the day on weekdays when the load active power is larger than the holiday. The SOC of the storage battery B is set so that the SOC of the storage battery B is less than the SOC of the storage battery B at the start time of the day. On the other hand, on holidays where the load active power is smaller than on weekdays, the SOC of storage battery B is set so that the SOC of storage battery B at the final time of the day is greater than the SOC of storage battery B at the start time of the day. Set.

  By setting in this way, the amount of power generated from the generator G1 can be reduced by the power generated by lowering the charging rate of the storage battery B every day on weekdays when the load effective power is larger than the holiday. it can.

  On the other hand, on holidays when the load active power is low compared to weekdays, the generator G1 generates the charging power necessary to increase the charging rate of the storage battery B every day, thereby reducing the power generation amount of the generator G1. Can be increased.

  Thus, according to the operation plan generation device 100 according to the present embodiment, since the operation plan is generated so as to further level the power generation amount of the generator G1 in the power system 1000, the power can be generated more efficiently. The system 1000 can be operated.

  Note that the operation plan generation device 100 according to the present embodiment ends the processing by outputting the operation plan obtained as described above to the output device 160 or transmitting it to another computer via the communication device 130. However, as shown in FIG. 9, each component device in the electric power system 1000 can be controlled.

  In the example illustrated in FIG. 9, the operation plan generation device 100 illustrates a state where the two generators G, the storage battery B, and the phase adjusting equipment S are controlled.

  According to such an aspect, it becomes possible to operate the power system 1000 more efficiently and flexibly.

  Next, the operation plan generated by the operation plan generation apparatus 100 according to the present embodiment is compared with the operation plan generated by an apparatus different from the present embodiment, while the operation plan generation apparatus 100 according to the present embodiment is used. The generated operation plan will be described.

  Specifically, the operation plan shown as a comparative example below is a charge rate constraint so that the SOC of the storage battery B at the start and end of each day during the operation plan generation target period (one week) is returned to 50% every day. It is the operation plan of the generator G and the storage battery B obtained when the conditions are determined and the optimum power flow calculation is performed for the power system 1000. The conditions other than the charging rate restriction condition are the same as those in the present embodiment.

  FIG. 10 shows an operation plan of the storage battery B obtained when the optimum power flow calculation for the power system 1000 is performed using the charging rate constraint condition of the comparative example.

  Moreover, FIG. 11 shows a generator G1, a generator G2, a solar power generator PV in the power system 1000, which is obtained when the optimum power flow calculation for the power system 1000 is performed using the charging rate constraint condition of the comparative example. The power supply / demand situation of each of the load L and storage battery B is represented.

  And FIG. 12 shows the case where the planned value of the daily power generation amount of the generator G for each day from Monday to Sunday is calculated using the charging rate constraint condition according to this embodiment, and the charging rate constraint condition according to the comparative example. It is the figure which compared the case where it calculated using.

  As shown in FIG. 12, in the operation plan generated using the charge rate constraint condition according to the present embodiment, compared to the comparative example, the discharge generated by reducing the charge rate of the storage battery B every day on weekdays. Due to the power, the amount of power generated by the generator G decreases, and on holidays, the amount of power generated by the generator G increases due to the required charging power by increasing the charging rate of the storage battery B every day. When it sees, the operation | movement of the generator G is leveled more.

  Thus, by setting the SOC of storage battery B at the last day of the day to a different value depending on the day of the week information such as weekdays, instead of load leveling on a daily basis as in the comparative example, on a weekly basis Load leveling is performed, and the generator G can be operated more efficiently.

= Various embodiments =
In the above embodiment, the target period of the operation plan is one week from Monday to Sunday, and the charge rate of the storage battery B at the start time and end time for 7 days of each day is determined in the charge rate constraint condition, Moreover, in the case of weekdays, the charging rate of the storage battery B is determined so that the second charging rate, which is the charging rate at the end time, is smaller than the first charging rate, which is the charging rate at the starting time, and in the case of holidays Explained the case where the charging rate of the storage battery B is determined so that the second charging rate is larger than the first charging rate, but the timing for determining the charging rate under the charging rate constraint condition and the value of the charging rate are appropriately determined. Can be changed.

  For example, even if the target period of the operation plan is one week and only for, for example, Monday, the charge rate constraint condition is set so that the second charge rate at the end time is smaller than the first charge rate at the start time Good. Even in such an aspect, at least the power generated according to the difference between the charging rate of the storage battery B at the start time of Monday and the charging rate of the storage battery B at the end time is consumed during the daytime on Monday when the power demand increases. Thereby, since the electric power generation amount of the generator G can be suppressed, the effective operation | use of an electric power grid | system is realizable.

  Alternatively, for example, the target period of the operation plan is one week, and for example, two days of Monday and Tuesday are one specific period, and the second charging rate at the end of Tuesday is higher than the first charging rate at the start of Monday. The charging rate constraint condition may be determined so that becomes larger.

  According to such an aspect, for example, it is predicted that the total value of the power demand on Wednesday is greatly increased by the weather forecast as compared with the total value of power demand on Monday and the total value of power demand on Tuesday. In such a case, an operation plan is generated in which the storage battery B is charged on Monday and Tuesday when the power demand is relatively small, and the power stored in the storage battery B is used on Wednesday. By doing so, it is possible to operate the power system 1000 more efficiently and appropriately.

  As can be seen from this, the charging rate of the storage battery B determined in the charging rate constraint condition does not have to be determined separately on weekdays and holidays, for example, the storage battery B at the start of a specific period in the target period of the operation plan. The charging rate of the storage battery B may be determined so that the first charging rate that is the charging rate of the storage battery B differs from the second charging rate that is the charging rate of the storage battery B at the end of the specific period.

  By generating an operation plan for the generator G and the storage battery B in the electric power system 1000 configured to include the generator G, the load L, and the storage battery B, the operation of the generator G and the storage battery B is more appropriate. It is possible to generate a plan.

  Moreover, when the total value of the predicted value of the power consumption in the specific period in the target period of the operation plan is larger than the predetermined value, the storage battery B so that the second charging rate is smaller than the first charging rate. The charging rate of the storage battery B is set so that the second charging rate is larger than the first charging rate when the total value of the predicted values of power consumption in a specific period is equal to or less than a predetermined value. It can also be determined.

  According to such an aspect, the storage battery B is charged with power during a specific period in which the power consumption is relatively small during the target period of the operation plan, and during a specific period in which the power consumption is relatively large, Since the operation plan of using the electric power charged in the storage battery B can be generated, it becomes possible to operate the electric power system 1000 more efficiently and appropriately.

  The predetermined value may be set as appropriate using information such as past results and weather forecasts.

  Moreover, you may make it determine the variation | change_quantity of the charging rate in each specific period in the object period of an operation plan so that the charging rate of the storage battery B in the object period of an operation plan may become equal.

  For example, as shown in FIG. 5, when the target period of the operation plan is one week from Monday to Sunday, the charging rate of the storage battery B at the start of Monday and the charging rate of the storage battery B at the end of Sunday And the amount of change in the charging rate of the storage battery B on each day of the week may be determined so that they are equal.

  According to such an aspect, it is possible to easily generate an operation plan continuously every week for one week.

  In addition, when the target period of the operation plan includes seven specific periods corresponding to each day of seven consecutive calendar days, the power consumption is relatively large in the target period of the operation plan. Weekdays (generally Monday to Friday) and holidays with relatively low power consumption (generally Saturday and Sunday) can be included, and the power generation amount of the generator G can be leveled In this case, since the storage battery B can be used more effectively, a more efficient and preferable operation plan can be generated.

  Moreover, as shown to Formula (18)-(24), when the specific period in an operation plan production | generation object period is a weekday, the 1st charge rate which is a charge rate in the start time of the said specific period, The difference from the second charging rate, which is the charging rate at the end point, is a value corresponding to the ratio between the total value of power consumption for all weekdays in the target period and the total value of power consumption for the specific period. If the values of the first charging rate and the second charging rate are determined so that the specific period is a holiday, the difference between the first charging rate and the second charging rate in the specific period is the target period. The values of the first charging rate and the second charging rate are determined so as to be a value according to a ratio between the total value of the power consumption of all holidays within the period and the total value of the power consumption during the specific period. It is also effective to do.

  According to such an aspect, the charge amount and the discharge amount to the storage battery B are controlled according to the difference in power demand in each special period within the operation plan generation target period. It is possible to level the power generation amount of the generator G within 1000.

  Although the operation plan generation device 100 according to the present embodiment has been described above, according to the operation plan generation device 100 according to the present embodiment, in the power system 1000 configured to include the generator G, the load L, and the storage battery B. When generating an operation plan for the generator G and the storage battery B, it is possible to generate a more appropriate operation plan for the generator G and the storage battery B.

  The embodiments described above are for facilitating the understanding of the present invention, and are not intended to limit the present invention. The present invention can be changed and improved without departing from the gist thereof, and equivalents thereof are also included in the present invention.

100 Operation Plan Generation Device 101 Acquisition Unit 102 Operation Plan Calculation Unit 110 CPU
120 Memory 130 Communication Device 140 Storage Device 150 Input Device 160 Output Device 170 Recording Medium Reading Device 600 Control Program 700 Data Storage Unit 800 Recording Medium 1000 Power System B Storage Battery G Generator L Load PV Photovoltaic Generator S Phase Control Facility T Power Transmission line

Claims (9)

An operation plan generation device that generates an operation plan of the power generation facility and the power storage facility in a power system configured to include a power generation facility, a load facility, and a power storage facility,
An objective function for calculating a power generation cost of the power generation facility, and an acquisition unit for acquiring a constraint condition regarding operation of the power generation facility and the power storage facility;
Based on the predicted value of the power consumption of the load facility during the target period of the operation plan, the operation plan of the power generation facility and the storage facility that minimizes the value of the objective function while satisfying the constraint condition An operation plan calculation unit for calculating
With
The constraint condition includes a first charging rate that is a charging rate of the power storage facility at a start time of the specific period in the target period, and a second charging rate that is a charging rate of the power storage facility at the end point of the specific period. And a charging rate constraint condition that determines the charging rate of the power storage equipment is included ,
The specific period is a period of one day or more consisting only of weekdays or holidays only in units of days,
In the charge rate constraint condition, when the specific period consists only of weekdays, the charge rate of the power storage equipment is determined such that the second charge rate is smaller than the first charge rate, If a particular time period consists of only rest holidays, the operation plan generating apparatus according to claim Rukoto charging rate of the power storage equipment is defined as towards the second charging rate than the first charging rate is increased . The operation plan generation device according to claim 1 ,
The target period of the operation plan is one week,
The specific period is one day,
The operation plan generation apparatus characterized in that the target period of the operation plan includes the seven specific periods corresponding to the days of the week. The operation plan generation device according to claim 2 ,
When the specific period is a weekday, the difference between the first charging rate and the second charging rate in the specific period is the total value of the power consumption of all weekdays in the target period, and the specific Determined based on the ratio of the total power consumption during the period,
When the specific period is a holiday, the difference between the first charge rate and the second charge rate in the specific period is the total value of the power consumption on all holidays in the target period, An operation plan generation device characterized in that the operation plan generation device is determined based on a ratio of a total value of the power consumption during a specific period. The operation plan generating device according to claim 2 or 3 ,
Change in charging rate in each specific period within the target period so that the charging rate of the power storage equipment at the start time of the target period is equal to the charging rate of the power storage equipment at the end time of the target period An operation plan generation device characterized in that the amount is determined. An operation plan generation device that generates an operation plan of the power generation facility and the power storage facility in a power system configured to include a power generation facility, a load facility, and a power storage facility,
An objective function for calculating a power generation cost of the power generation facility, and an acquisition unit for acquiring a constraint condition regarding operation of the power generation facility and the power storage facility;
Based on the predicted value of the power consumption of the load facility during the target period of the operation plan, the operation plan of the power generation facility and the storage facility that minimizes the value of the objective function while satisfying the constraint condition An operation plan calculation unit for calculating
With
The constraint condition includes a first charging rate that is a charging rate of the power storage facility at a start time of the specific period in the target period, and a second charging rate that is a charging rate of the power storage facility at the end point of the specific period. And a charging rate constraint condition that determines the charging rate of the power storage equipment is included,
The charging rate constraint condition is that the second charging rate is smaller than the first charging rate when the total value of the predicted values of the power consumption during the specific period is larger than a predetermined value. And when the total value of the predicted values of the power consumption during the specific period is less than or equal to the predetermined value, the second charging rate is more than the first charging rate. The operation plan generation device, wherein a charging rate of the power storage facility is determined to be large. A control method of an operation plan generation device that generates an operation plan of the power generation facility and the power storage facility in a power system configured to include a power generation facility, a load facility, and a power storage facility,
The operation plan generation device is a first charge rate that is a charge rate of the power storage equipment at a start time of a specific period in a target period of the operation plan, and a charge rate of the power storage equipment at the end time of the specific period. The power generation cost of the power generation facility while satisfying the constraint condition regarding the operation of the power generation facility and the power storage facility, including the charge rate constraint condition that determines the charge rate of the power storage facility so that the second charge rate is different from each other wherein generating the operation plan of the objective function for calculating so as to minimize
The specific period is a period of one day or more consisting only of weekdays or holidays only in units of days,
In the charge rate constraint condition, when the specific period consists only of weekdays, the charge rate of the power storage equipment is determined such that the second charge rate is smaller than the first charge rate, When the specific period consists only of holidays, the charging rate of the power storage facility is determined so that the second charging rate is larger than the first charging rate. Plan generation method. A control method of an operation plan generation device that generates an operation plan of the power generation facility and the power storage facility in a power system configured to include a power generation facility, a load facility, and a power storage facility,
The operation plan generation device is a first charge rate that is a charge rate of the power storage equipment at a start time of a specific period in a target period of the operation plan, and a charge rate of the power storage equipment at the end time of the specific period. The power generation cost of the power generation facility while satisfying the constraint condition regarding the operation of the power generation facility and the power storage facility, including the charge rate constraint condition that determines the charge rate of the power storage facility so that the second charge rate is different from each other Generating the operation plan so as to minimize the objective function for calculating
In the charging rate constraint condition, when the total value of the predicted power consumption of the load facility in the specific period is larger than a predetermined value, the second charging rate is more than the first charging rate. When the charging rate of the power storage facility is determined to be small, and the total value of the predicted values of the power consumption in the specific period is equal to or less than the predetermined value, the second charging rate is higher than the first charging rate. The operation plan generation method is characterized in that the charging rate of the power storage facility is determined so that the value of the power storage facility becomes larger. In an operation plan generation device for generating an operation plan of the power generation facility and the power storage facility in a power system configured to include a power generation facility, a load facility and a power storage facility,
The first charging rate that is the charging rate of the power storage facility at the start of the specific period in the target period of the operation plan, and the second charging rate that is the charging rate of the power storage facility at the end of the specific period are: An objective function for calculating a power generation cost of the power generation facility while satisfying a constraint condition regarding the operation of the power generation facility and the power storage facility, including a charge rate constraint condition that defines a charge rate of the power storage facility so as to be different from each other the is a program for realizing the means for generating the operation plan to minimize,
The specific period is a period of one day or more consisting only of weekdays or holidays only in units of days,
In the charge rate constraint condition, when the specific period consists only of weekdays, the charge rate of the power storage equipment is determined such that the second charge rate is smaller than the first charge rate, When the specific period includes only holidays, the charging rate of the power storage facility is determined so that the second charging rate is greater than the first charging rate.
A program characterized by that. In an operation plan generation device for generating an operation plan of the power generation facility and the power storage facility in a power system configured to include a power generation facility, a load facility and a power storage facility,
The first charging rate that is the charging rate of the power storage facility at the start of the specific period in the target period of the operation plan, and the second charging rate that is the charging rate of the power storage facility at the end of the specific period are: An objective function for calculating a power generation cost of the power generation facility while satisfying a constraint condition regarding the operation of the power generation facility and the power storage facility, including a charge rate constraint condition that defines a charge rate of the power storage facility so as to be different from each other A program for realizing means for generating the operation plan so as to minimize
In the charging rate constraint condition, when the total value of the predicted power consumption of the load facility in the specific period is larger than a predetermined value, the second charging rate is more than the first charging rate. When the charging rate of the power storage facility is determined to be small, and the total value of the predicted values of the power consumption in the specific period is equal to or less than the predetermined value, the second charging rate is higher than the first charging rate. The program is characterized in that the charging rate of the power storage facility is determined so that the value becomes larger.

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