JP2013212044A - Supply and demand control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a supply and demand control device which distributes a command value to a controlled generator and storage battery of load frequency control (LFC) so as to bring the residual capacity of the storage battery close to a target value, when calculating the control command value to the controlled generator and storage battery of LFC, in a power system.SOLUTION: The supply and demand control device includes area request amount calculation means for calculating power generation required for keeping a constant frequency of the power system, and power command value calculation means for calculating the output command value of the generator and the charge/discharge command value of the storage battery for bringing the residual capacity of the storage battery to a target value while satisfying the area request amount.

Description

  The present invention relates to power supply / demand control of a power system, and more particularly to a power supply / demand control apparatus that calculates and distributes control command values to generators and storage batteries of a power system.

  The power system maintains a predetermined rated frequency (50 Hz or 60 Hz) by maintaining a balance (supply / demand balance) between power generation amount (supply) and power consumption (demand). If power is insufficiently supplied, the rotational speed of the turbine generator is reduced and the system frequency is reduced. If power is excessively supplied, the rotation of the turbine generator is increased and the system frequency is increased. Therefore, in order to control the frequency of the power system to the rated frequency, it is necessary to make the power generation amount follow the power consumption amount.

  Load frequency control (LFC: Load Frequency Control) of an electric power system detects a frequency deviation from a reference value (rated frequency) of the system frequency, and changes the power generation output to a power plant that is designated to bring the frequency deviation closer to zero. It is the feedback control that assigns.

  In recent years, power generation systems using wind power generation, solar power generation, and the like have been promoted worldwide for the purpose of contributing to environmental problems such as CO2 emission reduction. However, these power generation systems are characterized in that the power generation amount fluctuates in a very short time. Since this fluctuation may be faster than the response speed of the generator, there is a problem that the balance between the supply and demand of the entire power system is disrupted, resulting in fluctuations in the system frequency. In order to solve this problem, an attempt has been made to secure an LFC adjustment capacity by using not only a generator but also a secondary battery (storage battery) for load frequency control. For example, the following patent document 1, patent document 2, and non-patent document 1 describe techniques that use a secondary battery for load frequency control.

  In Patent Document 1, when the secondary battery is discharged to 20 to 30% of the remaining capacity or charged to 70 to 80%, charging and discharging of the secondary battery is stopped. A technique for performing load frequency control only by a generator is disclosed.

Patent Document 2 discloses a method of correcting the charging depth so that the charging depth of the secondary battery is 50 [%].
Non-Patent Document 1 discloses an LFC logic that cooperates by sharing a short cycle AR requirement to a storage battery and a long cycle AR variation to an existing power source. In addition, Non-Patent Document 1 controls charging / discharging of storage batteries so as to equalize the SOC (state of charge) of each NAS battery in order to reduce storage battery loss assuming a plurality of storage batteries. The technology is also disclosed.

Japanese Patent Laid-Open No. 2001-37085 (pages 7 and 7 in FIG. 2) JP 2012-16077 A (Fig. 27, page 7) "Research on utilization of storage battery for load frequency control (LFC)-Proposal of control method in coordination with existing power source and loss reduction method during LFC operation-", Central Research Institute of Electric Power Industry, Central Research Institute of Electric Power Industry, 2011 July, R10018, p.1-19

  However, the frequency control method and apparatus for an electric power system including a secondary battery described in Patent Document 1 is discharged when 20 to 30% of the remaining capacity of the secondary battery is discharged, or 70 to 80%. When the battery is charged up to, the charging / discharging of the secondary battery is stopped, so there is a possibility that the secondary battery may not be used. For this reason, the invention disclosed in this document must cope with large fluctuations in natural energy using only the generator during a time period when the battery cannot be used, which may make it impossible to balance supply and demand.

  Moreover, in the frequency control apparatus of the electric power system described in patent document 2, although the control for approaching the remaining capacity of a storage battery to 50% is carried out, in order to control the remaining capacity of a storage battery, local requirement amount is controlled. An unsatisfactory command value is given to the storage battery. For this reason, there is a problem that the frequency fluctuation of the power system is affected not a little.

  The method disclosed in Non-Patent Document 1 gives a charge / discharge command to the storage battery so as to equalize the SOC (remaining capacity) of each NAS battery, but when the remaining capacity approaches 0 as the entire storage battery system, Or when it approaches full charge, there exists a problem that a storage battery system stops functioning. As a result, this method has the same problem as Patent Document 1 in that the balance between power supply and demand cannot be maintained and the system frequency cannot be kept constant.

  The present invention has been made in order to solve the above-mentioned problems. In order to prevent the remaining capacity of the storage battery from being zero or fully charged, the remaining capacity of the storage battery is brought close to a predetermined target value and the LFC target satisfying the local requirement amount. It aims at providing the supply-and-demand control apparatus which controls the command value of a generator and a storage battery.

  In order to solve the above-described problem, the supply and demand control apparatus of the present invention is a supply and demand control apparatus that controls the load frequency of a power system having at least one generator and a storage battery each supplying power to the power system, A regional requirement amount calculating means for calculating a regional requirement amount using a system frequency, a system capacity, and a reference frequency, and a necessary power for calculating a necessary generated power necessary to control the generator and the storage battery from the regional requirement amount A power command value for calculating the output command value of the generator and the charge / discharge command value of the storage battery from the necessary generated power while bringing the remaining capacity of the storage battery close to a predetermined target value and satisfying the local requirement amount And a distribution amount calculation means.

  Further, the power command value distribution amount calculation means, when the remaining capacity of the storage battery is inside the dead band width of the remaining capacity, the output command value and the charge / discharge amount target value so as to approach the storage battery charge / discharge amount target value. A charge / discharge command value is calculated.

  According to the supply and demand control system of the present invention, since the control is performed to satisfy the local requirement amount and bring the remaining capacity of the storage battery close to the target value, it is avoided that the remaining capacity of the storage battery becomes 0 or fully charged. The discharge capacity can be utilized to the maximum, and the load frequency control can be performed without interruption.

  In addition, when the remaining capacity of the storage battery is within the dead band width, the storage battery and the generator are controlled so as to satisfy the local requirement and approach the target charge / discharge amount of the storage battery. It becomes possible to utilize the discharge capacity.

It is a figure which shows schematic structure (1st Embodiment) of a supply-and-demand control apparatus. It is a flowchart (the 1) which shows the operation | movement procedure of an electric power command value distribution amount calculation part. It is a flowchart (the 2) which shows the operation | movement procedure of an electric power command value distribution amount calculation part. It is a figure which shows simulation conditions (1st Embodiment). It is a figure showing simulation conditions (1st Embodiment). It is a figure showing a simulation result (1st Embodiment / the 1). It is a figure showing a simulation result (1st Embodiment / the 2). It is a figure showing a simulation result (1st Embodiment / the 3). It is a figure showing a simulation result (1st Embodiment / the 4). It is a figure which shows schematic structure (2nd Embodiment) of a supply-and-demand control apparatus. It is a flowchart (the 1) which shows the operation | movement procedure of an electric power command value distribution amount calculation part. It is a flowchart (the 2) which shows the operation | movement procedure of an electric power command value distribution amount calculation part. It is a figure which shows simulation conditions (2nd Embodiment). It is a figure showing simulation conditions (2nd Embodiment). It is a figure showing a simulation result (2nd Embodiment / the 1). It is a figure showing a simulation result (2nd Embodiment / the 2).

Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.
In the description of the embodiment of the present invention, a command is given to the generator and the storage battery every second. That is, it is assumed that the control is performed at a cycle of 1 second. However, the control in this 1 second cycle is an example, and for example, a control cycle of every 3 seconds may be used.
<First Embodiment>
Hereinafter, with reference to FIGS. 1-9, the supply-and-demand control apparatus in the 1st Embodiment of this invention is demonstrated. Also, differences in simulation results between the present embodiment and the prior art will be described.

FIG. 1 is a diagram schematically showing a relationship between a supply and demand control device and its peripheral devices, a generator to be controlled, a storage battery, and the like.
The supply and demand control device 500 collects various data from the frequency measurement device 100, the interconnection point power flow measurement device 200, the power generation amount measurement device 300, and the storage battery remaining capacity measurement device 400, and generates and outputs power to the generator 600 and the storage battery 700. Gives the discharge output command. The supply and demand control device 500 is a computer such as a general-purpose computer or a PLC (programmable logic controller), and includes a regional requirement amount calculation unit 510, a necessary power conversion unit 520, and a power command value distribution amount calculation unit 530. The power supply / demand control apparatus 500 distributes the power command value to the generator and the storage battery to the generator command value and the storage battery command value so that the power command value distribution amount calculation unit 530 brings the storage battery closer to the target value of the remaining capacity. Note that the target value of the remaining capacity of the storage battery can be expressed as a ratio to the full charge capacity of the storage battery, and is set to 60 [%], for example. The present invention is not limited to this, and may be expressed using units such as [kWh].

Hereinafter, each device shown in FIG. 1 and its function will be described in detail.
The frequency measuring device 100 is a device that measures a frequency from one point of the power system. In the case of 50 Hz or 60 Hz, the frequency is normally collected in units of 0.01 Hz. When measuring the frequency of several points, representative values, such as the average value, are transmitted to the supply-and-demand control apparatus 500, for example.

The interconnection point power flow measuring device 200 is a device that measures a power flow at a connection point with a connected power system.
The power generation amount measuring device 300 is a device that measures the power generation amount of the generator. When there are a plurality of generators to be controlled, they are individually measured and individually transmitted to the supply and demand controller 500.

  The storage battery remaining capacity measuring device 400 is a device that measures the remaining capacity of the storage battery. The remaining capacity may be measured as 0 to 100% with respect to the full charge capacity, or may be measured in units such as [kWh]. When there are a plurality of storage batteries to be controlled, they are individually measured and transmitted to the supply and demand control device 500 individually.

  In FIG. 1 and the following description, for convenience, the power generation amount measuring device 300 and the storage battery remaining capacity measuring device 400 are shown as one, but a plurality of power generation amount measuring devices and a plurality of storage battery remaining capacity measuring devices are provided. It may be a configuration. Although the supply and demand control device 500 is not particularly illustrated, a transmission device such as a memory, a CPU, and a LAN is mounted therein. The regional requirement amount calculation unit 510, the required power conversion unit 520, and the power command value distribution amount calculation unit 530 implemented in the supply and demand control apparatus 500 will be described below.

The regional requirement amount calculation unit 510 is a function for calculating the regional requirement amount AR (supply / demand imbalance) from the system frequency, the reference frequency (rated frequency), the interconnection point flow, and the like. Here, the regional requirement amount AR is defined below, and the derivation method differs depending on the following three load frequency control (LFC) schemes.
1. Constant frequency control system (Flat Frequency Control, FFC)
AR [kW] =-system constant [% / Hz] × system capacity [kW] × frequency deviation [Hz]
The frequency deviation is defined by the difference between the system frequency and the reference frequency (rated frequency). The reference frequency is 50 Hz or 60 Hz in Japan. The system frequency is a value measured by the frequency measuring device 100. The system constant and the system capacity are constants specific to the target power system.
2. Tie Line Load Frequency Control (TBC)
AR [kW] = − system constant [% / Hz] × system capacity [kW] × frequency deviation [Hz] + interconnection point power flow deviation [kW]
The linkage point tidal current deviation is defined by the difference between the linkage point tidal current and the linkage point tidal current target value. The tidal current is positive in the direction from the grid to the local grid. The interconnection point tidal current is a value measured by the interconnection point tidal current measuring apparatus 200. In addition, a connection point power flow target value is a purchased power plan value from a connected power system or a charging power plan value for the power system.
3. Constant Tie Line Control (FTC)
AR [kW] = Linkage point tidal current deviation [kW]
The interconnection point tidal current deviation is defined by the difference between the interconnection point tidal current and the interconnection point tidal current target value, as in the above TBC.

  The necessary power conversion unit 520 multiplies the regional requirement amount AR obtained by the regional requirement amount calculation unit 510 by a control coefficient, and converts it into a control operation amount (necessary generated power P) to be given to the LFC target generator and storage battery. For example, when the load frequency control is performed by PID control, the necessary generated power P is calculated as in the following equation.

Necessary generated power P = control coefficient (proportional gain Kp, integral gain Ki, differential gain Kd) × regional requirement AR
Here, it can be said that the necessary generated power P is a total value of power required for the generator and the storage battery. In other words, “power generation” here means not only the output of the generator but also the discharge of the storage battery as a kind of “power generation”.

  The power command value distribution amount calculation unit 530 calculates how the required generated power P calculated by the required power conversion unit 520 is distributed to the LFC target generator and the storage battery. The generator command value / storage battery command value is a command value that increases or decreases the output given to the generator / storage battery, and its unit is [kW]. When the generator command value / battery command value is a positive value, it is a command value to increase / charge the output [kW], and when the generator command value / battery command value is a negative value, the output Is a command value that reduces / discharges [kW].

  For example, in the case of power [kW] that can be changed per second as the output change rate of how much the generator / storage battery can change the output per unit time, the unit of the output change rate is [kW / s]. In addition, the upper limit that can increase the output within the control cycle is referred to as “raising allowance”, and the upper limit that can decrease the output is referred to as “lowering allowance”. The unit of the raising allowance and the lowering allowance is [kW]. Here, when control is performed at a cycle of 1 second, the increase allowance or the decrease allowance can be calculated by multiplying the output change rate [kW / s] by 1 [s]. If the output change rate is expressed in [%] with respect to the rated output of the generator, calculate the generator up / down allowance by multiplying the output change rate [%] by the rated output of the generator. To do.

  When allocating the necessary generated power P to the LFC target generator and the storage battery, the processing is performed in consideration of the cost of raising and lowering the generator and the storage battery. In the following description, the sign of the generator raising allowance is a positive value, and the sign of the generator lowering allowance is a negative value.

  Next, with reference to FIG. 2 and FIG. 3, the operation | movement procedure of the electric power command value distribution amount calculation part 530 is demonstrated in detail. The power command value distribution amount calculation unit 530 receives the necessary generated power P from the required power conversion unit 520 and starts processing.

  First, the power command value distribution amount calculation unit 530 determines whether the required generated power P is a value greater than or equal to 0 or a negative value in step S11. If the required generated power P is a value greater than 0 (step S11, Yes) ) Proceeds to step S12. If the required generated power P is a negative value (step S11, No), the process proceeds to step A. Then, after finishing the process of the flowchart of FIG. 3 mentioned later, it returns to the flowchart of FIG. 2 from step B, and complete | finishes a process.

  By the way, in order to keep the system frequency constant, it is necessary to increase the total output of the generator and the storage battery when the necessary generated power P is larger than 0, and when the necessary generated power P is smaller than 0, the generator and the storage battery The total output needs to be reduced. When the required generated power P is 0, the system frequency is kept constant, so there is no need to change the total output of the generator and the storage battery. In the following embodiment, when the required generated power P is 0, the output distribution of the generator and storage battery is distributed so that the remaining capacity of the storage battery approaches the target value without changing the total output of the generator and storage battery. Shall be changed.

  Next, in step S12, the power command value distribution amount calculation unit 530 determines whether or not the required generated power P is equal to or less than the generator raising allowance. When the required generated power P is larger than the power generation cost of the generator (step S12, No), the process proceeds to step S13. When the necessary generated power P is equal to or less than the generator raising cost (step S12, Yes), the process proceeds to step S14.

In step S13, the power command value distribution amount calculation unit 530 distributes the necessary generated power P as follows, and ends the process.
Generator command value = generator increase allowance Battery command value = generator increase allowance−necessary generated power P
In step S <b> 14, power command value distribution amount calculation unit 530 determines the magnitude relationship between the measured value (SOC measured value) of the remaining capacity of the storage battery and the target value (SOC target value) of the remaining capacity of the storage battery. The SOC target value may be set by an operator, or may be a plan value for a generator start / stop plan (UC: Unit Commitment) or economic load distribution control (EDC).

  When the SOC measurement value is larger than the SOC target value (No at Step S14), the process proceeds to Step S15, where the power command value distribution amount calculation unit 530 distributes the necessary generated power P as follows, and ends the process.

Generator command value = Necessary generated power P
Battery command value = 0
When the SOC measurement value is equal to or less than the SOC target value (step S14, Yes), the process proceeds to step S16.

In step S <b> 16, power command value distribution amount calculation unit 530 calculates charging power a of the storage battery to become the SOC target value by the following formula.
Charging power a [kW] = (SOC target value [kWh] −SOC measurement value [kWh]) × 3600
The charging power in the present embodiment means power necessary for charging to the SOC target value in one second. Therefore, 3600 is multiplied for unit conversion from [kWh] to [kW].

  Note that the charging power a is 0 or more (not negative). In the following description, when the SOC target value and the SOC measurement value are expressed in [%], the capacity [kWh] at the time of full charge is multiplied by the SOC target value and the SOC measurement value to be converted into [kWh] display. doing.

Next, in step S <b> 17, the power command value distribution amount calculation unit 530 determines the magnitude relationship between the sum of the necessary generated power P and the charged power “a” and the generator raising cost.
If the power generation cost is equal to or greater than the sum of the necessary power generation P and the charging power a (Yes in step S17), it is possible to cover the power corresponding to the sum of the power generation power P and the charging power a with the power generation cost. is there. Therefore, the power command value distribution amount calculation unit 530 distributes the necessary generated power P as follows (step S18) and ends the process.

Generator command value = required generated power P + charged power a
Battery command value = charging power a
If the power generation cost is not larger than the sum of the necessary power generation P and the charging power a (No in step S17), it is impossible to cover the power corresponding to the sum of the power generation power P and the charging power a at the power generation cost. Since it is possible, the electric power command value distribution amount calculation part 530 distributes the required generated electric power P as follows (step S19), and complete | finishes a process.

Generator command value = generator increase allowance Battery command value = generator increase allowance−necessary generated power P
Here, before describing step A in FIG. 2 (FIG. 3 to be described later), numerical examples of the processes in steps S13, 15, 16, 18, and 19 will be described.

  A numerical example in the case of step S13 in FIG. 2 will be described. When the required generated power P received by the power command value distribution amount calculation unit 530 from the required power conversion unit 520 is 100 [kW] and the generator raising cost is 90 [kW] below the required generated power P, the output of the generator Cannot afford SOC control of the storage battery. In this case, through step S11 Yes and step S12 No, the power command value distribution amount calculation unit 530 calculates step S13 as follows.

Generator command value = Generator raising cost = 90 [kW]
Storage battery command value = generator raising allowance-necessary generated power P = 90-100 = -10 [kW]
(Storage battery is not discharged and SOC controlled)
A numerical example in the case of step S15 in FIG. 2 will be described. The required generated power P received by the power command value distribution amount calculation unit 530 from the required power conversion unit 520 is 100 [kW], the generator raising cost is 150 [kW] exceeding the required generated power P, and the SOC target value is 50 [%] When the SOC measurement value is 60 [%], the power command value distribution amount calculation unit 530 calculates Step S15 as follows through Yes in Step S11, Yes in Step S12, and No in Step S14. To do.

Generator command value = required generated power P = 100 [kW]
Battery command value = 0
(No change in output of storage battery, no SOC control)
A numerical example in the case of step S18 in FIG. 2 will be described. The required generated power P received by the power command value distribution amount calculation unit 530 from the required power conversion unit 520 is 10 [kW], the generator raising cost is 400 [kW] exceeding the required generated power P, and the SOC target value is 50 [%] When the SOC measurement value is 49.9 [%] and the full charge capacity of the storage battery is 100 [kWh], the output of the generator has a margin of 390 [kW]. At this time, since the remaining capacity of the storage battery is smaller than the target value, it is necessary to issue a command for charging the storage battery in order to bring the remaining capacity close to the target value. In step S16, how much charging is necessary for the remaining capacity of the storage battery to reach the target value (charging power a) is calculated as follows.

Charging power a [kW] = (SOC target value [kWh] −SOC measurement value [kWh]) × 3600
= (0.5 × 100 [kWh] −0.499 × 100 [kWh]) × 3600
= 360 [kW]
In such a case, the magnitude relationship between the sum of the necessary generated power P (10 [kW]) and the charged power a (360 [kW]) and the generator raising cost (400 [kW]) is determined in step S17. Since the generator can cover the power corresponding to the sum of the required generated power P and the charging power a, the calculation is performed as follows in step S18.

Generator command value = required generated power P + charged power a
= 10 + 360 = 370 [kW]
Storage battery command value = charging power a = 360 [kW] (the storage battery is charged, with SOC control)
As described above, in the case of step S18 in FIG. 2, since there is a margin in the output increase amount of the generator, the storage battery can be obtained by setting the output command value of the generator as the sum of the necessary generated power P and the charging power a of the storage battery. Can be brought close to the target value.

  A numerical example in the case of step S19 in FIG. 2 will be described. The required generated power P received by the power command value distribution amount calculation unit 530 from the required power conversion unit 520 is 100 [kW], the generator raising cost is 150 [kW] exceeding the required generated power P, and the SOC target value is 50 [%] When the SOC measurement value is 40 [%] and the full charge capacity of the storage battery is 100 [kWh], the output of the generator has a margin of 50 [kW]. At this time, since the remaining capacity of the storage battery is smaller than the target value, it is necessary to issue a command for charging the storage battery in order to bring the remaining capacity close to the target value. In step S16, how much charging is necessary for the remaining capacity of the storage battery to reach the target value (charging power a) is calculated as follows.

Charging power a [kW] = (SOC target value [kWh] −SOC measurement value [kWh]) × 3600
= (0.5 × 100 [kWh] −0.4 × 100 [kWh]) × 3600
= 36000 [kW]
In such a case, the magnitude relationship between the sum of the necessary generated power P (100 [kW]) and the charged power a (36000 [kW]) and the generator raising cost (150 [kW]) is determined in step S17. Since the generator cannot cover the power corresponding to the sum of the necessary generated power P and the charged power a, the calculation is performed as follows in step S19.

Generator command value = Generator raising cost = 150 [kW]
Battery command value = generator raising cost-necessary generated power P = 150-100
= 50 [kW] (The storage battery is charged and with SOC control)
As described above, in the case of step S19 in FIG. 2, since there is a margin in the output increase amount of the generator, the storage battery can be obtained by setting the output command value of the generator as the sum of the necessary generated power P and the charging power a of the storage battery. Can be brought close to the target value.

  Next, step A (FIG. 3) in FIG. 2 will be described. In FIG. 2, the power command value distribution amount calculation unit 530 proceeds to step A (FIG. 3) when the necessary generated power P is a negative value in step S11 (No in step S11). In step S21 shown in FIG. 3, the power command value distribution amount calculation unit 530 determines the magnitude relationship between the required generated power P (negative value) and the generator lowering allowance (negative value), and the required generated power P Is smaller than the generator lowering allowance (step S21, No), the process proceeds to step S22. When the required generated power P is larger than the generator lowering allowance (Yes in step S21), the process proceeds to step S23.

In step S22, the power command value distribution amount calculation unit 530 distributes the necessary generated power P as follows, proceeds to step B, returns to the process in FIG. 2, and then ends the process.
Generator command value = Generator lowering allowance Storage battery command value = Generator lowering allowance-Necessary generated power P
In step S23, power command value distribution amount calculation unit 530 determines the magnitude relationship between the SOC measurement value and the SOC target value.

  When the SOC measurement value is smaller than the SOC target value (No at Step S23), the process proceeds to Step S24, where the power command value distribution amount calculation unit 530 distributes the necessary generated power P as follows, proceeds to Step B, and FIG. Then, the process is terminated.

Generator command value = Necessary generated power P
Battery command value = 0
When the SOC measurement value is larger than the SOC target value (step S23, Yes), the process proceeds to step S25.

In step S25, the power command value distribution amount calculation unit 530 calculates the discharge power b of the storage battery to become the SOC target value by the following formula, similarly to the charging power a.
Discharge power b [kW] = (SOC target value [kWh] −SOC measurement value [kWh]) × 3600
The discharge power b in the present embodiment means the power necessary for discharging to the SOC target value in 1 second. In contrast to the charging power b having a positive value, the charging power b has a negative value.

In step S <b> 26, the power command value distribution amount calculation unit 530 determines the magnitude relationship between the sum of the necessary generated power P and the discharged power b and the generator lowering allowance.
If the generator lowering allowance is less than or equal to the sum of the necessary generated power P and the discharged power b (step S26, Yes), the output of the power corresponding to the sum of the required generated power P and the discharged power b may be reduced. Is possible. Therefore, the power command value distribution amount calculation unit 530 distributes the necessary generated power P as follows (step S27), proceeds to step B, returns to the process of FIG. 2, and then ends the process.

Generator command value = required generated power P + discharge power b
Battery command value = discharge power b
If the generator lowering allowance is larger than the sum of the necessary generated power P and the discharged power b (No in step S26), the output of the power corresponding to the sum of the required generated power P and the discharged power b may be reduced. Therefore, the power command value distribution amount calculation unit 530 distributes the necessary generated power P as follows (step S28), proceeds to step B, returns to the process of FIG. 2, and then ends the process.

Generator command value = Generator lowering allowance Storage battery command value = Generator lowering allowance-Necessary generated power P
Here, numerical examples of the processes of steps S22, 24, 27, and 28 will be described.
A numerical example in the case of step S22 in FIG. 3 will be described. When the required generated power P received by the power command value distribution amount calculation unit 530 from the required power conversion unit 520 is −100 [kW] and the generator lowering cost is −90 [kW] below the required generated power P, the generator Since there is no margin in the output of the battery, SOC control of the storage battery cannot be performed. In this case, through No in step S21, the power command value distribution amount calculation unit 530 calculates step S22 as follows.

Generator command value = Generator lowering allowance = −90 [kW]
Storage battery command value = generator lowering allowance−necessary generated power P = −90 − (− 100)
= 10 [kW] (Rechargeable battery is not charged and SOC control is not performed)
A numerical example in the case of step S24 in FIG. 3 will be described. The required generated power P received from the required power conversion unit 520 by the power command value distribution amount calculation unit 530 is −100 [kW], the generator lowering cost exceeds −150 [kW], and the SOC target value is 50 If the SOC measurement value is 40 [%], the power command value distribution amount calculation unit 530 calculates Step S24 as follows through Yes in Step S21 and No in Step S23.

Generator command value = required generated power P = −100 [kW]
Storage battery command value = 0 (no output change in storage battery, no SOC control)
A numerical example in the case of step S27 in FIG. 3 will be described. The required generated power P received from the required power conversion unit 520 by the power command value distribution amount calculation unit 530 is −10 [kW], the generator lowering cost exceeds −400 [kW], and the SOC target value is 50 [%], SOC measurement value is 50.1 [%], and the full charge capacity of the storage battery is 100 [kWh], the output of the generator has a margin of -390 [kW]. At this time, since the remaining capacity of the storage battery is larger than the target value, it is necessary to issue a discharge command to the storage battery in order to bring the remaining capacity close to the target value. In step S25, how much discharge is necessary for the remaining capacity of the storage battery to reach the target value (discharge power b) is calculated as follows.

Discharge power b [kW] = (SOC target value [kWh] −SOC measurement value [kWh]) × 3600
= (0.5 × 100 [kWh] −0.501 × 100 [kWh]) × 3600
= -360 [kW]
In such a case, the magnitude relationship between the sum of the necessary generated power P (−10 [kW]) and the discharged power b (−360 [kW]) and the generator lowering allowance (−400 [kW]) in step S26. The generator can reduce the output of the power corresponding to the sum of the necessary generated power P and the discharged power, and thus the calculation is performed as follows in step S27.

Generator command value = required generated power P + discharge power b = −10 + (− 360) = − 370 [kW]
Storage battery command value = discharge power b = −360 [kW] (the storage battery is discharged and has SOC control)
As described above, in the case of step S27 in FIG. 3, since there is a margin in the output reduction amount of the generator, the storage battery can be obtained by setting the output command value of the generator as the sum of the necessary generated power P and the discharge power b of the storage battery. Can be brought close to the target value.

  A numerical example in the case of step S28 in FIG. 3 will be described. The required generated power P received from the required power conversion unit 520 by the power command value distribution amount calculation unit 530 is −100 [kW], the generator lowering cost exceeds −150 [kW], and the SOC target value is 50 When [%], the SOC measurement value is 60 [%], and the full charge capacity of the storage battery is 100 [kWh], the output of the generator has a margin of −50 [kW]. At this time, since the remaining capacity of the storage battery is larger than the target value, it is necessary to issue a discharge command to the storage battery in order to bring the remaining capacity close to the target value. In step S25, how much discharge is necessary for the remaining capacity of the storage battery to reach the target value (discharge power b) is calculated as follows.

Discharge power b [kW] = (SOC target value [kWh] −SOC measurement value [kWh]) × 3600
= (0.5 × 100 [kWh] −0.6 × 100 [kWh]) × 3600
= -36000 [kW]
In such a case, the magnitude relationship between the sum of the necessary generated power P (−100 [kW]) and the discharged power b (−36000 [kW]) and the generator lowering allowance (−150 [kW]) is determined in step S26. Since it is impossible to reduce the output of the power corresponding to the sum of the necessary generated power P and the discharged power b, the generator calculates as follows in step S28.

Generator command value = Generator lowering allowance = −150 [kW]
Battery command value = generator lowering allowance−necessary generated power P = −150 − (− 100)
= -50 [kW] (The storage battery has discharge and SOC control)
As described above, in the case of step S28 in FIG. 3, since there is a margin in the output reduction amount of the generator, the storage battery is obtained by setting the output command value of the generator as the sum of the necessary generated power P and the discharge power b of the storage battery. Can be brought close to the target value.

  In addition, when there are a plurality of generators subject to LFC, it is necessary to consider a method for calculating a generator raising allowance and a method for distributing generator command values to a plurality of generators. For example, the method of calculating the allowance for raising a plurality of generators may be obtained by adding the allowance for each generator and making the allowance for the entire generator group. In addition, as a method of allocating the generator command value calculated by the power command value distribution amount calculation unit 530 to a plurality of generators, priorities are assigned to the generators in advance, and the output from the higher priority generator is output. A method of giving an increase / decrease command is conceivable.

  When there are a plurality of storage batteries subject to LFC, it is necessary to consider the calculation method of the SOC measurement value and how to distribute the storage battery command value to the plurality of storage batteries. The calculation method of the SOC measurement value of a some storage battery can be set as the SOC measurement value of the whole storage battery group by measuring the SOC measurement value of each storage battery, and taking the sum total. In addition, as a method of allocating storage battery command values calculated by the power command value distribution amount calculation unit 530 to a plurality of storage batteries, a method of assigning priorities to the storage batteries in advance and giving a charge / discharge command from a higher-order storage battery In addition, considering the magnitude relationship between the remaining capacity of each storage battery and the SOC target value, a method of allocating commands so that the remaining capacity approaches the target value can be considered.

  Next, simulations for verifying the effects of the present embodiment will be described with reference to FIGS. 4 and 5 show the simulation conditions. As shown in FIG. 4, the constant frequency control method for load frequency control was targeted, and the system capacity was set to 8000 [kW]. The number of facilities is three generators (one of which is an LFC target generator and two of which are EDC target generators) and one LFC target storage battery. Detailed description of the simulation conditions shown in FIG. 4 is omitted. The simulation was performed assuming that the capacity of the storage battery in the initial state is charged to 70% of the maximum storage capacity. Further, the data shown in FIG. 5 is used as load fluctuation and output fluctuation due to wind power generation, and the supply and demand of the long period component (EDC adjustment range) is completely matched by the EDC target generator 1 and the EDC target generator 2. It is said that it is in a state.

  6 to 9 show the simulation results of the present embodiment. The upper stage (a) shows the result of this embodiment, and the lower stage (b) shows the result of the conventional technique (when SOC control is not performed). As is clear from FIG. 6, in the present embodiment shown in (a), the system frequency is kept within 60 ± 0.1 Hz, but in the prior art shown in (b), the system is in the vicinity of 1450 [s]. The frequency deviates from 60 ± 0.1 [Hz]. As shown in FIG. 9 (b), in the conventional technology, the storage battery is fully charged in the vicinity of 1450 [s], and as a result, the output of the storage battery becomes 0 and the function is stopped as shown in FIG. 8 (b). You can see that On the other hand, in this embodiment, as shown in FIG. 9A, it can be seen that the SOC (remaining capacity) of the storage battery is gradually approaching 50 [%]. Further, as shown in FIG. 8A, it can be seen that the output of the storage battery is always functioning without the time zone where the output of the storage battery stays at zero. In FIG. 7, the superiority and inferiority of the present embodiment and the prior art are not found, but it can be seen that the generator is also operated in conjunction.

The supply / demand control apparatus 500 described above has the following effects.
According to the supply and demand control apparatus 500 of the present invention, by controlling the remaining capacity of the storage battery to be close to the target value, the possibility that the remaining capacity of the storage battery becomes 0 [%] or 100 [%] is reduced, and the output of the storage battery is reduced. The load frequency control is performed without interruption because the change in the frequency does not change rapidly. In addition, the system frequency is not disturbed because the control is performed in consideration of the local requirement.

Moreover, since the installation capacity of a storage battery can be made small compared with the case where the remaining capacity of a storage battery is not controlled, cost reduction and reduction of installation space can be aimed at.
Second Embodiment
Hereinafter, with reference to FIGS. 10-16, the supply-and-demand control apparatus and simulation result in the 2nd Embodiment of this invention are demonstrated.

  FIG. 10 is a diagram schematically showing the relationship between the supply and demand control device and its peripheral devices, the generator to be controlled, the storage battery, and the like, as in FIG. The difference from the first embodiment is that it has a storage battery charge / discharge amount measuring device 800 that measures the charge / discharge amount from the state (information) of the storage battery 700 and a control method using the charge / discharge amount. . The storage battery charge / discharge amount measuring device 800 transmits the charge / discharge amount to the power command value distribution amount calculation unit 530a of the supply and demand control device 500a. The supply / demand control apparatus 500a has a storage battery charge / discharge amount target value provided in advance in a memory (not shown) or the like, and the power command value distribution amount calculation unit 530a calculates a power command value using this value. Although the specific operation procedure of the power command value distribution amount calculation unit 530a will be described later, the difference between the power command value distribution amount calculation unit 530a and the power command value distribution amount calculation unit 530 is that the remaining capacity of the storage battery is the dead zone of the target value. If it is within the range, even if the generator has surplus capacity, the output control command value is sent to the generator and storage battery so that the measured value of the storage battery charge / discharge amount approaches the storage battery charge / discharge amount target value without performing the SOC control. The point is to allocate. Here, the dead zone is a buffer zone for preventing hunting and the like from being generated in the control, and an example in this embodiment is shown in FIG.

Next, with reference to FIG. 11 and FIG. 12, an operation procedure of the power command value distribution amount calculation unit 530a will be described.
The power command value distribution amount calculation unit 530a receives the necessary generated power P from the required power conversion unit 520 and starts processing. Differences from the first embodiment (power command value distribution amount calculation unit 530) are as follows.

A point provided with a dead band process A process for bringing the SOC measurement value closer to the target charge / discharge amount when the SOC measurement value is inside the dead band width. Specifically, step S34 to step S37 in FIG. 11, step S43 in FIG. Step S46 is applicable, and the other processes are the same as those in FIGS. 2 and 3 of the first embodiment. Therefore, the same processes are denoted by the same reference numerals and description thereof is omitted.

Steps S34 to S37 in FIG. 11 will be described.
In step S34, power command value distribution amount calculation unit 530a determines the magnitude relationship between the SOC measurement value and the SOC target value. Furthermore, power command value distribution amount calculation unit 530a determines whether or not the SOC measurement value is outside the dead band width. The dead zone width may be set arbitrarily, for example, set to target value ± dead zone set value [kWh]. Alternatively, target value ± dead zone setting value [%] may be used. In addition, hysteresis may be provided in the dead zone. In short, hysteresis is a kind of sensitivity design, and a specific example is shown in FIG. 16B described later, and defines the dead band width when the SOC measurement value returns from the outside to the inside of the dead band width. For example, when the normal dead zone width is “target value ± dead zone setting value [kWh]”, the hysteresis is set as “target value ± dead zone setting value / 2 [kWh]”. Alternatively, it may be set as “target value ± dead zone setting value / 2 [%]”. In any case, the setting is made in the direction of narrowing the dead zone width.

The SOC target value may be set by an operator, or a generator start / stop plan (UC) or economic load distribution control (EDC) plan value may be used.
When the SOC measurement value is equal to or less than the SOC target value and the SOC measurement value is outside the dead zone width (step S34, Yes), the power command value distribution amount calculation unit 530a proceeds to step S16 and performs SOC control. In other cases (No in step S34), the process proceeds to step S35 without performing the SOC control.

  In step S35, the power command value distribution amount calculation unit 530a determines the magnitude relationship between the target charge / discharge amount of the storage battery and the actual charge / discharge amount of the storage battery. If the target charge / discharge amount of the storage battery is smaller than the actual charge / discharge amount of the storage battery (step S35, Yes), the power command value distribution amount calculation unit 530a proceeds to step S36 to approach the target charge / discharge amount of the storage battery. Then, an output increase / decrease command value in the discharge direction is given to the storage battery. Therefore, the power command value distribution amount calculation unit 530a distributes the necessary generated power P as follows, and ends the process.

Generator command value = Generator lowering allowance Storage battery command value = Generator lowering allowance-Necessary generated power P
If the charge / discharge amount target value of the storage battery is not smaller than the actual charge / discharge amount of the storage battery (No in step S35), the power command value distribution amount calculation unit 530a proceeds to step S37. That is, in order to approach the charge / discharge amount target value of the storage battery, the storage battery needs to give an output increase / decrease command value in the charging direction. Therefore, the power command value distribution amount calculation unit 530 distributes the necessary generated power P as follows, and ends the process.

Generator command value = generator increase allowance Battery command value = generator increase allowance−necessary generated power P
Here, the processing of the power command value distribution amount calculation unit 530a in step S36 of FIG. 11 will be described with specific numerical values. The required generated power P received by the power command value distribution amount calculation unit 530a from the required power conversion unit 520 is 10 [kW], the generator raising cost exceeds 400 [kW], and the generator lowering cost is −400. [kW], SOC target value 50 [%], SOC measurement value 49.9 [%], dead band width target value ± 0.5 [%], full charge capacity of storage battery 100 [kWh] When the target charge / discharge amount is 20 [kW] (charge) and the actual charge / discharge amount of the storage battery is 50 [kW] (charge), the output of the generator has a margin of 390 [kW]. After Yes in S12, it is determined in step S34 whether or not the SOC control can be performed. Since the SOC measurement value is the target value −0.1 [%], it is inside the dead zone width. Therefore, step 34 is No, and the power command value distribution amount calculation unit 530a proceeds to step S35 where the SOC control is not performed. At this time, the generator command value and the storage battery command value are calculated so that the actual charge / discharge amount value of the storage battery approaches the target charge / discharge amount value of the storage battery.

  Next, the power command value distribution amount calculation unit 530a determines the magnitude relationship between the storage battery charge / discharge amount target value (20 [kW]) and the storage battery charge / discharge amount actual value (50 [kW]) in step S35. . Under this condition, it is necessary to issue an output increase / decrease command to the storage battery in the discharge direction in order to approach the charge / discharge amount target value of the storage battery. Therefore, the power command value distribution amount calculation unit 530a calculates in step S36 as follows.

Generator command value = Generator lowering allowance = −400 [kW]
Battery command value = generator lowering allowance-necessary generated power P = -400-10
= -410 [kW] (The storage battery is discharged without SOC control)
As described above, in the case of step S36 in FIG. 11, since the SOC measurement value is inside the dead band width, the power command value distribution amount calculation unit 530a does not perform the SOC control. However, by giving the command value as described above, the actual charge / discharge amount of the storage battery can be brought close to the target charge / discharge amount of the storage battery.

  Next, the process of the power command value distribution amount calculation unit 530a in the case of step S37 in FIG. 11 will be described with specific numerical values. The required generated power P received by the power command value distribution amount calculation unit 530a from the required power conversion unit 520 is 10 [kW], the generator raising cost is 400 [kW] exceeding the necessary generated power, and the generator lowering cost is −400 [ kW], SOC target value 50 [%], SOC measurement value 49.9 [%], dead band width target value ± 0.5 [%], battery full charge capacity 100 [kWh], battery charge When the discharge amount target value is 50 [kW] (charge) and the actual charge / discharge amount of the storage battery is 20 [kW] (charge), the output of the generator has a margin of 390 [kW], so step S12 In step S34, it is determined whether or not the SOC control can be performed. First, since the SOC measurement value is the target value −0.1 [%], it is inside the dead zone width. Therefore, step 34 is No, and the power command value distribution amount calculation unit 530a proceeds to step S35 where the SOC control is not performed. At this time, the power command value distribution amount calculation unit 530a calculates the generator command value and the storage battery command value so that the actual charge / discharge amount value of the storage battery approaches the target charge / discharge amount value of the storage battery.

  Next, in step S35, the power command value distribution amount calculation unit 530a determines the magnitude relationship between the storage battery charge / discharge amount target value (50 [kW]) and the storage battery charge / discharge amount actual value (20 [kW]). Under this condition, it is necessary to issue an output increase / decrease command to the storage battery in the charging direction in order to approach the target charge / discharge amount of the storage battery. Therefore, the power command value distribution amount calculation unit 530a calculates in step S37 as follows.

Generator command value = Generator raising cost = 400 [kW]
Storage battery command value = generator lowering allowance-necessary generated power P = 400-10
= 390 [kW] (The storage battery is discharged without SOC control)
As described above, in the case of step S37 in FIG. 11, the SOC measurement value is inside the dead zone width. For this reason, the electric power command value distribution amount calculation unit 530a does not perform the SOC control. However, by giving the command value as described above, the actual charge / discharge amount of the storage battery can be brought close to the target charge / discharge amount of the storage battery.

Next, step S43 to step S46 in FIG. 12 will be described.
In step S43, the power command value distribution amount calculation unit 530a determines the magnitude relationship between the SOC measurement value and the SOC target value. Further, power command value distribution amount calculation unit 530a determines whether or not the SOC measurement value is outside the target value ± dead zone setting value [kWh]. When the SOC measurement value is larger than the SOC target value and the SOC measurement value is outside the target value ± dead zone setting value [kWh] (step S43, Yes), the power command value distribution amount calculation unit 530a proceeds to step S25, and performs SOC control. To implement. In other cases (step S43, No), the SOC control is not performed, and the power command value distribution amount calculation unit 530a passes the step S44 to the generator and the storage battery so as to approach the charge / discharge amount target value of the storage battery. Allocate power command value.

  In step S44, the power command value distribution amount calculation unit 530a determines the magnitude relation between the target charge / discharge amount of the storage battery and the actual charge / discharge amount of the storage battery. When the power command value distribution amount calculation unit 530a determines that the charge / discharge amount target value of the storage battery is smaller than the actual charge / discharge amount value of the storage battery (Yes in step S44), the power command value distribution amount calculation unit 530a performs charge / discharge of the storage battery. In order to approach the quantity target value, it is necessary to give an output increase / decrease command value in the discharge direction to the storage battery. Therefore, the power command value distribution amount calculation unit 530a distributes the necessary generated power P as follows (step S45), proceeds to step B, returns to the process of FIG. 11, and then ends the process.

Generator command value = Generator lowering allowance Storage battery command value = Generator lowering allowance-Necessary generated power P
If the charge / discharge amount target value of the storage battery is not smaller than the charge / discharge amount actual value of the storage battery (No in step S44), the power command value distribution amount calculation unit 530a is close to the charge / discharge amount target value of the storage battery. It is necessary to give an output increase / decrease command value in the charging direction. Therefore, the power command value distribution amount calculation unit 530a distributes the necessary generated power P as follows (step S46), proceeds to step B, returns to the process of FIG. 11, and then ends the process.

Generator command value = generator increase allowance Battery command value = generator increase allowance−necessary generated power P
Here, the process of the power command value distribution amount calculation unit 530a in step S45 of FIG. 12 will be described with specific numerical values. The required generated power P received from the required power conversion unit 520 by the power command value distribution amount calculation unit 530a is −10 [kW], the generator lowering cost exceeds −400 [kW], and the generator raising cost is 400 [kW], SOC target value 50 [%], SOC measured value 50.1 [%], dead band width target value ± 0.5 [%], full charge capacity of storage battery 100 [kWh], storage battery When the target charge / discharge amount is 20 [kW] (charge) and the actual charge / discharge amount of the storage battery is 50 [kW] (charge), the generator output has a margin of -390 [kW]. Therefore, power command value distribution amount calculation unit 530a determines whether or not the SOC control can be performed in step S43 through Yes in step S21.

  First, since the SOC measurement value is the target value +0.1 [%], it is inside the dead zone width. Therefore, the power command value distribution amount calculation unit 530a proceeds to step S44 where step 43 is No and SOC control is not performed. At this time, the power command value distribution amount calculation unit 530a calculates the generator command value and the storage battery command value so that the actual charge / discharge amount value of the storage battery approaches the target charge / discharge amount value of the storage battery.

  Next, the power command value distribution amount calculation unit 530a determines the magnitude relationship between the storage battery charge / discharge amount target value (20 [kW]) and the storage battery charge / discharge amount actual value (50 [kW]) in step S44. . Under this condition, it is necessary to issue an output increase / decrease command in the discharge direction to the storage battery in order to approach the target charge / discharge amount of the storage battery. The power command value distribution amount calculation unit 530a calculates in step S45 as follows.

Generator command value = Generator lowering allowance = −400 [kW]
Battery command value = generator lowering allowance-necessary generated power P = -400 + 10
= -390 [kW] (The storage battery is discharged without SOC control)
As described above, in the case of step S45 in FIG. 12, the SOC measurement value is inside the dead zone width. For this reason, the power command value distribution amount calculation unit 530a does not perform the SOC control. However, by giving the command value as described above, the actual charge / discharge amount value of the storage battery can be brought close to the target charge / discharge amount value of the storage battery.

  Next, the process of the power command value distribution amount calculation unit 530a in step S46 of FIG. 12 will be described with specific similar numerical values. The required generated power P received from the required power conversion unit 520 by the power command value distribution amount calculation unit 530a is −10 [kW], the generator lowering cost exceeds −400 [kW], and the generator raising cost is 400 [kW], SOC target value 50 [%], SOC measured value 50.1 [%], dead band width target value ± 0.5 [%], full charge capacity of storage battery 100 [kWh], storage battery When the target charge / discharge amount is 50 [kW] (charge) and the actual charge / discharge amount of the storage battery is 20 [kW] (charge), the output of the generator has a margin of -390 [kW]. Therefore, power command value distribution amount calculation unit 530a determines whether or not the SOC control can be performed in step S43 through Yes in step S21.

  First, since the SOC measurement value is the target value +0.1 [%], it is inside the dead zone width. Therefore, Step 43 is No, and the power command value distribution amount calculation unit 530a proceeds to Step S44 where the SOC control is not performed. At this time, the power command value distribution amount calculation unit 530a calculates the generator command value and the storage battery command value so that the actual charge / discharge amount value of the storage battery approaches the target charge / discharge amount value of the storage battery.

  Next, the power command value distribution amount calculation unit 530a determines the magnitude relationship between the storage battery charge / discharge amount target value (50 [kW]) and the storage battery charge / discharge amount actual value (20 [kW]) in step S44. Under this condition, it is necessary to issue an output increase / decrease command in the charging direction to the storage battery in order to approach the target charge / discharge amount of the storage battery. For this reason, the power command value distribution amount calculation unit 530a calculates in step S46 as follows.

Generator command value = Generator raising cost = 400 [kW]
Storage battery command value = generator raising cost−necessary generated power P = 400 + 10
= 410 [kW] (The storage battery is discharged, without SOC control)
As described above, in the case of step S46 in FIG. 12, the SOC measurement value is inside the dead zone width. For this reason, the power command value distribution amount calculation unit 530a does not perform the SOC control. However, by giving the command value as described above, the actual charge / discharge amount value of the storage battery can be brought close to the target charge / discharge amount value of the storage battery.

The operation when there are a plurality of LFC-targeted generators and LFC-targeted storage batteries can also be considered as in the first embodiment.
Next, simulations for verifying the effects of the present embodiment will be described with reference to FIGS. 13 and 14 show simulation conditions. As shown in FIG. 13, the constant frequency control method of load frequency control was targeted, and the system capacity was 500 [kW]. The number of facilities is three generators (two of which are LFC target generators and one of which is an EDC target generator) and one LFC target storage battery. Detailed description of the simulation conditions shown in FIG. 13 is omitted.

  The simulation was performed assuming that the capacity of the storage battery in the initial state is charged to 60% of the maximum storage capacity. Moreover, the data of FIG. 14 was used as load fluctuation | variation and the output fluctuation | variation by photovoltaic power generation. In this embodiment, unlike the verification in the first embodiment, the verification is performed in consideration of a long-period component (EDC adjustment range).

  15 to 16 show simulation results of the present embodiment. In this embodiment, the SOC target value of the storage battery is set to 60 [%], and the dead zone width is set to have a hysteresis of ± 2 [%] in the first stage and ± 1 [%] in the second stage. Further, the target charge / discharge amount of the storage battery was set to 0 [kW]. As is apparent from FIG. 15A, in this embodiment, the system frequency is substantially kept within 60 ± 0.1 [Hz]. FIG. 15B shows the output state of each generator. Although not directly related to the characteristics of the present invention, the output is in consideration of the power generation cost. 16 (a) and 16 (b), the charge / discharge amount of the storage battery is controlled to be close to the target value of 0 [kW] during the time period in which the SOC (remaining capacity) of the storage battery is inside the dead zone. I can confirm.

The supply / demand control apparatus 500a described above has the following effects.
According to the supply and demand control apparatus 500a of the present invention, the storage battery remaining capacity becomes 0 [%] or 100 [%] by performing control to bring the remaining capacity of the storage battery close to the target value, as in the first embodiment. Since the possibility decreases and the output of the storage battery does not change rapidly, the load frequency control is performed without interruption. Furthermore, when the SOC is inside the dead zone, an output increase / decrease command is given to the generator and the storage battery so that the charge / discharge amount of the storage battery approaches the target value. It is possible to perform control in cooperation with control of long-period components such as EDC and EDC.

DESCRIPTION OF SYMBOLS 100 Frequency measuring device 200 Connection point tidal current measuring device 300 Electric power generation amount measuring device 400 Storage battery remaining capacity measuring device 500, 500a Supply / demand control device 510 Local demand amount calculation part 520 Necessary power conversion part 530, 530a Power command value distribution amount calculation part 600 Generator 700 Storage battery 800 Storage battery charge / discharge measuring device

Claims (8)

A supply and demand control device for controlling a load frequency of a power system having at least one generator and a storage battery each supplying power to the power system,
A regional requirement calculation means for calculating regional requirements using the system frequency, system capacity, and reference frequency;
A required power conversion unit that calculates necessary generated power that needs to control the generator and the storage battery from the regional requirement amount;
Power command value distribution amount calculating means for calculating the output command value of the generator and the charge / discharge command value of the storage battery satisfying the local requirement amount from the necessary generated power while bringing the remaining capacity of the storage battery close to a predetermined target value When,
A supply and demand control device comprising:   When the output of the generator has a margin with respect to the required generated power, the power command value distribution amount calculation means is configured to cause the remaining capacity of the storage battery to approach a predetermined target value and The supply / demand control apparatus according to claim 1, wherein a charge / discharge command value is calculated.   The power command value distribution amount calculating means has a margin for the output increase amount of the generator when the regional requirement amount is positive and the remaining capacity of the storage battery is lower than the predetermined target value. The supply / demand control apparatus according to claim 1, wherein the output command value is a sum of the required generated power and the charging power of the storage battery.   The power command value distribution amount calculation means, when the regional requirement amount is negative, when the remaining capacity of the storage battery is higher than a target value, and when the output reduction amount of the generator has a surplus, The supply and demand number control apparatus according to claim 1 or 2, wherein the supply and demand output command value uses a sum of the necessary generated power and the discharge power of the storage battery.   The regional requirement amount calculation means obtains the regional requirement amount from a product of a system constant, the system capacity, the system frequency, and a frequency deviation of the reference frequency. Supply and demand control device according to item.   The regional requirement amount calculating means obtains the regional requirement amount by subtracting a product of a system constant, a system capacity, a frequency deviation of the system frequency and the reference frequency from an interconnection point power flow deviation. The supply-and-demand control apparatus as described in any one of Claims 1-4. A supply and demand control device for controlling a power flow at an interconnection point of a power system having at least one generator and a storage battery each supplying power to the power system,
A regional requirement amount calculating means for calculating a regional requirement amount from the interconnection point tide;
A required power conversion unit that calculates necessary generated power that needs to control the generator and the storage battery from the regional requirement amount; and
Power command value distribution amount calculating means for calculating the output command value of the generator and the charge / discharge command value of the storage battery satisfying the local requirement amount from the necessary generated power while bringing the remaining capacity of the storage battery close to a predetermined target value When,
A supply and demand control device comprising:   When the remaining capacity of the storage battery is inside the dead band width with respect to the target value of the remaining capacity, the power command value distribution amount calculating means is configured to approach the output command so as to approach the charge / discharge amount target value of the storage battery. The supply / demand control apparatus according to claim 1, wherein a value and the charge / discharge command value are calculated.