Control Device for Distributed Power Source, Control Program, and Distributed Power Source System

Abstract

To provide a distributed power source control device, a distributed power source control program, and a distributed power source system capable of quickly maintaining the voltage at a point linked with a power system within a proper range by controlling a distributed power source on the basis of a voltage-power factor command value characteristic curve on which a power factor command constantly changes according to a linkage point voltage.SOLUTION: A control device 50 supplies reactive power from a distributed power source 30 linked with a power system 21, to the power system 21, and is configured to control the reactive power by adjusting a power factor of the distributed power source 30. A voltage-power factor command value characteristic curve 52 on which a power factor command value constantly changes according to an output voltage equivalent value (linkage point voltage) of the distributed power source 30, is provided. A power generator unit 32 of the distributed power source 30 is controlled based on a power factor command value obtained from the voltage-power factor command value characteristic curve 52 according to the output voltage equivalent value.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a control device, a control program, and a distributed power source system for controlling reactive power supplied from a distributed power source to a power system to maintain the system voltage within an appropriate range.

Background Art

[0002] In recent years, with the introduction of distributed power sources such as solar power generation systems, fluctuations in the system voltage due to fluctuations in the active power output and deviations from the appropriate range (voltage upper limit deviation, voltage lower limit deviation) have occurred. As one of the measures to solve these problems, a method of controlling the system voltage within an appropriate range by introducing an SVC (Static Var Compensator) to supply reactive power to the power system has been conventionally known.

[0003] The control methods of the SVC include voltage control, voltage fluctuation suppression control, etc. In any case, the connection point voltage of the SVC is measured, and reactive power is output according to the voltage. For example, in voltage control, the SVC outputs reactive power so that the connection point voltage matches the voltage command value or a value in its vicinity. As an application of voltage control, there is also a method of outputting reactive power when the voltage exceeds a certain threshold in order to prevent voltage upper and lower limit deviations. In voltage fluctuation suppression control, the SVC outputs reactive power so as to suppress the voltage fluctuation component extracted from the connection point voltage. Thus, the installation of the SVC is effective as a measure against voltage fluctuations and deviations from the appropriate range. However, for power transmission and distribution operators and renewable energy power generation operators, newly introducing the SVC has a problem that the equipment cost increases.

[0004] As a countermeasure against voltage fluctuations other than installing the SVC, it is conceivable that the distributed power source performs power factor constant control. In power factor constant control, based on the power factor command value, a certain ratio of reactive power is output with respect to the active power output of the distributed power source. Thereby, an effect of suppressing voltage fluctuations caused by fluctuations in the active power output of the distributed power source can be expected, but since it is not control according to the voltage, the connection point voltage cannot always be maintained within the appropriate range.

[0005] As another method related to power factor control, there is a method called Watt-power factor mode (IEC / TR 61850-90-7). In this method, instead of fixing the power factor command value, a power factor command value characteristic curve corresponding to the active power output of the distributed power source is defined, and based on this characteristic curve, reactive power corresponding to the active power output is output to the distributed power source. By presetting a power factor command value characteristic curve according to the characteristics of the interconnected system, this method can be expected to maintain the interconnected point voltage within a more appropriate range than power factor constant control. However, since it is not voltage-responsive control and is no different from power factor constant control in this regard, it is not always possible to maintain the interconnected point voltage within an appropriate range.

[0006] Also, as a method similar to the voltage control of SVC, there is a method called Volt-var mode (IEC / TR 61850-90-7). This defines a reactive power output characteristic curve corresponding to the interconnected point voltage of the distributed power source, and outputs reactive power based on this characteristic curve according to the interconnected point voltage. Since this method is voltage-responsive control of the interconnected point voltage, it can be expected to maintain the interconnected point voltage within an appropriate range.

[0007] However, for example, when the interconnected point voltage is decreasing, even if the active power output of the distributed power source is almost zero, reactive power is output, so compensation is also performed for voltage fluctuation factors not caused by the distributed power source itself. As a result, unfairness occurs due to the difference in burden between the distributed power source implementing this method and the distributed power source not implementing it. Furthermore, when setting to prioritize reactive power output over active power output, as a result of outputting reactive power by itself in response to voltage fluctuations caused by other distributed power sources, the active power that should originally be sold is restricted, and there is also a possibility of loss of power sales opportunities.

[0008] Note that as another method for maintaining the interconnected point voltage within an appropriate range, a prior art of controlling the power factor of the power conditioner constituting the distributed power source according to the interconnected point voltage is described in Patent Document 1. This prior art includes a remote power factor command unit that outputs a power factor control command to the power conditioner via a communication line, and aims to perform optimization control to maintain the connection point voltage within an appropriate range with a target power factor of 100% even when the measured value of the system voltage (connection point voltage) is within the dead band range.

Prior Art Documents

Patent Documents

[0009]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0010] In the prior art described in Patent Document 1, since the power factor of the power conditioner is gradually changed according to the connection point voltage, for example, when the connection point voltage changes suddenly due to tap switching of an SVR (Automatic Voltage Regulator), as pointed out in paragraphs

[0050] and

[0051] of the same document, it takes time to converge to an appropriate power factor, and as a result, the connection point voltage may deviate from the appropriate range.

[0011] Therefore, the problem to be solved by the present invention is to define a voltage - power factor command value characteristic curve according to the connection point voltage, and by adjusting the power factor of the distributed power source to a predetermined value according to the above characteristic curve even when the connection point voltage changes suddenly, to provide a control device, a control program, and a distributed power source system for a distributed power source capable of maintaining the connection point voltage within an appropriate range.

Means for Solving the Problems

[0012] To solve the above problems, form The control device for a distributed power source according to 1 is a control device for supplying reactive power to the power system by a distributed power source connected to the power system, and in the control device for controlling the reactive power by adjusting the power factor of the distributed power source, It is characterized by having a voltage - power factor command value characteristic curve in which the power factor command value is continuously changed according to the equivalent value of the output voltage of the distributed power source, and controlling the distributed power source according to the power factor command value obtained from the voltage - power factor command value characteristic curve according to the equivalent value of the output voltage.

[0013] form The control device for a distributed power source according to 2 form In 1 relating to In a control device for a distributed power source The voltage - power factor command value characteristic curve is characterized in that within a predetermined range of the equivalent value of the output voltage, the power factor command value continuously changes to the lag side as the equivalent value of the output voltage increases.

[0014] form The control device for a distributed power source according to 3 form In 1 or 2 relating to In a control device for a distributed power source Means for calculating a reactive power command value using the power factor command value obtained from the voltage - power factor command value characteristic curve and the measured active power value of the distributed power source Means for controlling the distributed power source using the reactive power command value and the measured reactive power value of the distributed power source It is characterized by comprising

[0015] form The control device for a distributed power source according to 4 Form 1 or 2 In relating to In a control device for a distributed power source Means for obtaining a first active power limit value by multiplying the power factor command value and the maximum apparent power value of the distributed power source, and selecting the lower value of the measured active power value of the distributed power source and the first active power limit value as the active power command value Means for controlling the distributed power source using the reactive power command value, the active power command value, the measured active power value, and the measured reactive power value of the distributed power source It is characterized by comprising

[0016] form The control device for a distributed power source according to 5 form In 4 relating toIn a control device for a distributed power source, select the lowest value among the first active power limit value, the second active power limit value limited by the maximum active power that the distributed power source can output, and / or the active power measurement value as the active power command value this characterized by the above.

[0017] form The control device for a distributed power source according to 6 form any one of 1 to 5 a form in relating to In a control device for a distributed power source, characterized in that a power factor command value is obtained by giving the result of averaging the output voltage equivalent value to the voltage-power factor command value characteristic curve.

[0018] form The control program according to 7 is a control program for adjusting the power factor of a distributed power source connected to a power grid to control the reactive power supplied by the distributed power source to the power grid, a function of generating a power factor command value that continuously changes according to the output voltage equivalent value of the distributed power source, a function of generating a reactive power command value of the distributed power source using the power factor command value and the active power measurement value or active power command value of the distributed power source, a function of controlling the reactive power supplied by the distributed power source to the power grid using the reactive power command value and the reactive power measurement value of the distributed power source, characterized in that the above is realized by an arithmetic processing unit.

[0019] form The distributed power source system according to 8 is a distributed power source system in which a plurality of distributed power sources are connected to a power grid, form any one of 3 to 5 a form in relating to configured to collectively control the plurality of distributed power sources using a control device for a distributed power source, characterized in that the control device includes means for distributing the reactive power command value to the plurality of distributed power sources.

Advantages of the Invention

[0020] According to the present invention, based on the voltage - power factor command value characteristic curve, by adjusting the power factor of the distributed power source according to the power factor command value corresponding to the equivalent output voltage of the distributed power source, for example, the connection point voltage, the reactive power supplied to the power grid can be continuously controlled, the connection point voltage can be quickly changed, and maintained within an appropriate range. In addition, since there is no risk of excessive compensation for voltage fluctuation factors not caused by the distributed power source itself, there is no concern that the active power that should be sold is restricted by outputting reactive power when voltage fluctuations occur due to other distributed power sources or the like, resulting in the loss of a power selling opportunity. Therefore, economic benefits can be expected.

Brief Description of the Drawings

[0021]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Modes for Carrying Out the Invention

[0022] Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an overall configuration diagram of a power system including an embodiment of the present invention. In FIG. 1, for example, in a power system 21 connected to a three-phase AC power supply 20, a distributed power source 30 is connected via a transformer 40. Further, 22 represents a system impedance composed of a resistor and an inductor, 41 represents a connection point with the power system 21, and 33 represents a distributed power source connection point.

[0023] The distributed power source 30 includes a DC power source 31 such as a solar panel, a power conditioner system (PCS) 32 that performs DC / AC conversion by the operation of a power converter, and a control device 50 that controls the power generation unit 32. The control device 50 controls the power converter in the power generation unit 32 based on the voltage V m and current I m at the connection point 41, etc. Here, instead of the voltage V m and current I m at the connection point 41, the voltage and current at the distributed power source connection point 33 may be input to the control device 50 and used for control. That is, the "equivalent value of the output voltage of the distributed power source" in the claims is a concept including the voltage at the connection point 41 and the voltage at the distributed power source connection point 33 described above.

[0024] Although not shown, as the distributed power source, it is only necessary to have a function of converting DC power or mechanical power into AC power (active power and reactive power) and outputting it. For this reason, in addition to sunlight, DC power generated using renewable energy such as wind power, or a device that converts DC power from a storage battery, a fuel cell, etc. into AC power may be used, or a synchronous generator, an induction generator, etc. that converts mechanical power generated using thermal power or hydraulic power into AC power may also be used.

[0025] Next, the configuration and function of the control device 50 will be described. The configuration and functions of the control device 50 in this embodiment are realized by the hardware and software (program) of an arithmetic processing device including a CPU (Central Processing Unit), an FPGA (Field-Programmable Gate Array), an ASIC (Application Specific Integrated Circuit), etc.

[0026] FIG. 2 is a block diagram showing the main part of the first embodiment of the control device 50. Here, the control of the reactive power according to the first embodiment will be referred to as voltage-variable power factor control. In FIG. 2, the interconnection point voltage (measured value) V m is input to a first-order lag filter (low-pass filter) 51 as an averaging processing means, and after the steep fluctuation components are removed, it is given to a voltage-power factor command value characteristic curve 52. Note that the configuration of the first-order lag filter 51 is not particularly limited. Also, as the averaging processing means, not only the first-order lag filter 51 but also means for performing a moving average process may be used. This also applies to other embodiments described later.

[0027] The voltage-power factor command value characteristic curve 52 is, for example, as shown in FIGS. 3(a) and (b), the power factor command value PF m of the distributed power source 30 that changes according to the interconnection point voltage V ref , and the relationship between the interconnection point voltage V m and the power factor command value PF ref is stored in the memory as a mathematical formula or a table.

[0028] FIG. 3(a) shows that when the interconnection point voltage V m is below the reference value V0 of the system voltage (for example, in a low-voltage distribution system with an effective value of 100 [V], 101 [V], etc.), the power factor command value PF ref is set to 1.0 (100%), and when the interconnection point voltage V m is higher than the reference value V0, the power factor command value PF ref continuously changes to the "lag" side with a certain slope. Also, FIG. 3(b) shows that the interconnection point voltage V mThe higher the power factor command value PF ref is shifted towards the "lag" side, and the connection point voltage V m is shifted towards the "lead" side as it becomes lower, and it has a characteristic of continuously changing. In any case, the voltage - power factor command value characteristic curve 52 only needs to have a characteristic that the power factor command value continuously changes towards the "lag" side as the connection point voltage V m is within a predetermined range of the connection point voltage V m and becomes higher. As can be seen from FIGS. 3(a) and 3(b), the power factor command value PF m1 when the connection point voltage is V ref1 is higher than the power factor command value PF m2 (V m1 <V m2 ) and approaches 1.0 (100%). ref2

[0029] Here, the "lag" of the power factor command value PF ref in FIGS. 3(a) and 3(b) means that the distributed power source 30 is operated at a lagging power factor to supply lagging reactive power (inductive reactive power) to the power system 21, and the "lead" of the power factor command value PF ref means that the distributed power source 30 is operated at a leading power factor to supply leading reactive power (capacitive reactive power) to the power system 21. Generally, in order to maintain the voltage of the power system within an appropriate range, it is required that the distributed power source be operated at a lagging power factor of 0.85 (85%) or more in principle.

[0030] Returning to FIG. 2, the power factor command value PF ref obtained from the voltage - power factor command value characteristic curve 52 is input to the reactive power command value calculation unit 53. Also, the voltage V m and current I m of the connection point 41 shown in FIG. 1, and the measured active power value P m obtained therefrom are also input to the reactive power command value calculation unit 53.

[0031] In the reactive power command value calculation unit 53, based on the power factor command value PF ref , the measured active power value P m ​Based on Equation 1, the reactive power command value Q is calculated so as to output a certain ratio of reactive power with respect to ref it. [Equation 1] Q ref =P m √{(1 - PF ref 2 ) / PF ref 2}

[0032] The above reactive power command value Q ref is input into the distributed power source control system 54 together with the reactive power measurement value Q m . Note that the reactive power measurement value Q m can be calculated from the voltage V m and current I m at the connection point 41 in the same manner as the active power measurement value P m . The distributed power source control system 54 adjusts the reactive power (reactive current) output to the power grid 21 by operating the power converter in the power generation unit 32 in FIG. 1 so that the reactive power measurement value Q m matches the reactive power command value Q ref , thereby controlling the voltage at the connection point 41.

[0033] In FIG. 2, instead of the active power measurement value, reactive power measurement value, and reactive power command value, the active current measurement value, reactive current measurement value, and reactive current command value may be used. Furthermore, although the first - order lag filter 51 as the averaging processing means is not an essential configuration, by removing the instantaneous fluctuation component from the input voltage, it is possible to avoid the distributed power source from reacting overly sensitively and becoming unstable.

[0034] Next, FIG. 4 shows the configuration of the main parts of the distributed power source control system 54 and the power generation unit 32. In FIG. 4, the power generation unit 32 includes an inverter unit 32a that converts the DC power of the DC power source 31 into AC power by PWM (pulse - width modulation) control.

[0035] The control command calculation unit 54a in the distributed power source control system 54 calculates the above - mentioned reactive power command value Q ref and the reactive power measurement value Qm and based on the input / output voltages V d , V a and the currents I d , I a detected by the sensors 34 and 35, etc., a control command (voltage command) for the inverter section 32a is generated. The PWM circuit 54b compares the control command from the control command calculation section 54a with a carrier to generate a PWM pulse, and on / off controls the semiconductor switching element of the inverter section 32a with a drive signal based on this PWM pulse, and outputs reactive power of the amount of the reactive power command value Q ref as shown from the PCS connection terminal 33 to the power grid 21. Also, active power control is performed as necessary.

[0036] As described above, according to the first embodiment of the present invention, when the tie point voltage V m is high, more inductive reactive power is output according to the active power of the distributed power source 30, and when the tie point voltage V m is low, according to the active power of the distributed power source 30 (more than when the tie point voltage V m is high), the inductive reactive power is reduced or capacitive reactive power is output, whereby the tie point voltage V m can be maintained within an appropriate range.

[0037] Furthermore, since reactive power is output according to the active power of the distributed power source 30, voltage fluctuations caused by fluctuations in the active power output of the distributed power source itself can be suppressed. Also, even if the tie point voltage V m is decreasing, if the active power output of the distributed power source 30 is almost zero, no reactive power is output, so excessive compensation is not performed for voltage fluctuation factors not caused by the distributed power source itself. Similarly, as a result of outputting reactive power for voltage fluctuations caused by other distributed power sources etc. connected to the power grid 21, there is no risk of losing a power selling opportunity due to the limitation of the active power that should originally be sold.

[0038] Next, the reactive power control according to the second embodiment and the third embodiment of the control device 50 will be described with reference to FIG. 5. First, the second embodiment combines the voltage-variable power factor control according to the first embodiment and the VA control of the power generation unit 32. The VA control is a method of controlling the active power and reactive power of the power generation unit 32 so as not to exceed the apparent power maximum value VA max (VA constraint) output from the power generation unit 32.

[0039] Specifically, the active power VA limit value calculation unit 55 shown in FIG. 5 multiplies the power factor command value PF ref obtained from the voltage-power factor command value characteristic curve 52 by the apparent power maximum value VA max to obtain the active power VA limit value as the maximum active power value that can be obtained from the VA constraint and the power factor command value PF ref . This active power VA limit value corresponds to the first active power limit value in the claims. The active power VA limit value as this first active power limit value and the active power measurement value P m are compared by the lower value priority unit 57 to select the lower value (when active power in both positive and negative directions can be obtained as in the case of using a storage battery as the DC power source 31 in FIG. 1, the lower value in absolute value is selected), and this is output as the active power command value P ref .

[0040] In the reactive power command calculation unit 53A, the reactive power command value Q ref is calculated by Equation 2 using the power factor command value PF ref and the active power command value P ref . [Equation 2] Q ref =P ref √{(1 - PF ref 2 ) / PF ref 2} This reactive power command value Q ref , the reactive power measurement value Q m , the active power command value P ref , and the active power measurement value P m are input to the distributed power source control system 54A, and if the active power control, reactive power / current control, PWM control, etc. of the power generation unit 32 are performed, the VA of the power generation unit 32 maxThe active power and reactive power at the connection point 41 can be controlled with a desired power factor within a range not exceeding this value.

[0041] Next, the third embodiment combines the active power limit control of the power generation unit 32 in addition to the first and second embodiments described above. This active power limit control is a control method for restricting the active power output from the power generation unit 32 as necessary. The active power limit value in this embodiment corresponds to the second active power limit value in the claims.

[0042] That is, the active power limit control unit 56 in FIG. 5 outputs an active power limit value (second active power limit value) set as necessary as described later. In the lower value priority unit 57, this second active power limit value, the active power VA limit value which is the above-mentioned first active power limit value, and / or the active power measurement value P m Among them, the smallest value (the smallest value among the three combinations of the second active power limit value and the active power VA limit value, the second active power limit value and the active power measurement value P m The second active power limit value, the active power VA limit value, and the active power measurement value P m Is selected, and the selected value is output as the active power command value P ref As described above, when positive and negative active powers can be obtained as in the case of using a storage battery as the DC power source 31, the value with the lower absolute value is selected and output as the active power command value P ref

[0043] Here, the active power limit control unit 56 has various configurations and functions as necessary. For example, when it is desired to reduce the active power output even when the distributed power source 30 outputs reactive power and the connection point voltage V m Is high, the connection point voltage V m Is input to the active power limit control unit 56, and when the connection point voltage V m Exceeds a predetermined connection point voltage threshold value, the active power limit value may be configured to be reduced to a desired value. ​Also, when it is desired to reduce the active power output of the distributed power source 30 due to problems such as surplus power and transmission line capacity, the active power limit value may be configured to be reduced to a desired value based on an output limit command input to the active power limit control unit 56 from the outside.

[0044] Next, a fourth embodiment of the present invention regarding a distributed power source system composed of a plurality of distributed power sources connected to the power grid 21 will be described. Although not shown, when a plurality of distributed power sources are connected to the power grid 21, the control device 50 according to the first to third embodiments described above may be mounted on each distributed power source. Alternatively, a configuration may be adopted in which a plurality of distributed power sources are collectively controlled, and the reactive power command value Q ref may be distributed to each distributed power source. As a distribution method in that case, for example, the following methods can be considered.

[0045] (1) A value Q ref obtained by dividing the reactive power command value Q ref n (n = 1 to N) is distributed as the reactive power command value for each distributed power source. The reactive power command value for each distributed power source at this time is shown in Equation 3. [Equation 3] Q ref n = Q ref / N

[0046] (2) The reactive power command value Q ref is distributed according to the active power output P n of each distributed power source. The reactive power command value for each distributed power source at this time is shown in Equation 4. [Equation 4] Q ref n = Q ref × (P n / ΣP n )

[0047] (3) The reactive power command value Q ref is distributed according to the reactive power output margin Q margin n of each distributed power source. The reactive power command value for each distributed power source at this time is shown in Equation 5. Here, the reactive power output margin Q margin nis the reactive power command value Q ref For the nth distributed power source, the reactive power Q ref n that can be output is an index for determining whether it is large (there is remaining capacity) or small (there is no remaining capacity). [Equation 5] Q ref n = Q ref × (Q margin n / ΣQ margin n ) For example, when the reactive power command value Q ref is "100" and the reactive power output remaining capacities Q margin 1 , Q margin 2 , Q margin 3 of three distributed power sources (N = 3) are "85", "45", and "70" respectively, then 85 × (100 / 200) = 42.5 is assigned to Q ref 1 , 22.5 is assigned to Q ref 2 , and 35.0 is assigned to Q ref 3 respectively.

[0048] Furthermore, as another distribution method, there is the following method. (4) Distribute the reactive power command value Q ref according to the priority order of the reactive power output of each distributed power source and the aforementioned reactive power output remaining capacity Q margin n . The procedure according to this distribution method is shown in Fig. 6. In Fig. 6, first, one of the N distributed power sources is set as the first priority for reactive power output (n = 1), and the reactive power command value Q ref calculated by the reactive power command value calculation unit is set as the initial value (step S1).

[0049] Next, for the distributed power source with the first priority, determine whether the reactive power output remaining capacity Q margi1 is less than or equal to the Q ref of the reactive power command value (initial value), and confirm that n < N (step S2). Note that when the reactive power output remaining capacity Q margi1 exceeds the initial value of Q ref (step S2 No), then Q ref n = Q ref , that is, the reactive power command value Q refSince it is possible to output the reactive power corresponding thereto, the process is terminated (step S6).

[0050] The reactive power output margin Q of the distributed power source with the highest priority margi1 is the initial value Q ref If it is less than or equal to the following and n < N (Yes in step S2), the reactive power command value Q for the first distributed power source ref 1 = Q margi1 is set to use the margin of the distributed power source to the maximum extent (step S3). Next, the value obtained by subtracting Q ref from the initial value Q ref 1 is set as the new reactive power command value Q ref (step S4). Next, the priority is incremented (step S5), and thereafter, the processes after step S2 are repeatedly executed until n = N.

[0051] As described above, according to the fourth embodiment, by distributing the reactive power command value Q ref to each distributed power source by various methods, it is possible to control a plurality of distributed power sources collectively.

[0052] In the present invention, part or all of the voltage - variable power factor control and the distributed power source control function by the control device 50 may be implemented in a remote server or the like, and measurement and control may be performed via communication with the power generation unit 32 in the distributed power source 30. Also, the voltage - power factor command value characteristic curve may be manually or automatically changed by direct or remotely controlled communication, and may be changed based on a predetermined schedule or by a specific trigger input.

Explanation of Reference Numerals

[0053] 20: AC power source 21: Power grid 22: System impedance 30: Distributed power source 31: DC power source 32: Power generation unit (PCS) 32a: Inverter unit 33: PCS connection terminal 34, 35: Sensor 40: Transformer 41: Connection point 50: Control device 51: First-order lag filter 52: Voltage - power factor command value characteristic curve 53, 53A: Reactive power command value calculation unit 54, 54A: Distributed power control system 54a: Control command calculation unit 54b: PWM circuit 55: Active power VA limit value calculation unit 56: Active power limit control unit 57: Lower value priority unit

Claims

1. A control device for supplying reactive power to a power system by a distributed power source connected to the power system, in a control device for controlling the reactive power by adjusting the power factor of the distributed power source, it is provided with a voltage-power factor command value characteristic curve in which the power factor command value is continuously changed according to the equivalent output voltage value of the distributed power source, and controls the distributed power source according to the power factor command value obtained from the voltage-power factor command value characteristic curve according to the equivalent output voltage value, means for multiplying the power factor command value by the apparent power maximum value of the distributed power source to obtain a first active power limit value, and selecting the lower value of the measured active power value of the distributed power source and the first active power limit value as the active power command value; means for controlling the distributed power source using the reactive power command value, the active power command value, the measured active power value, and the measured reactive power value of the distributed power source; A control device for a distributed power source, comprising:

2. In the control device for a distributed power source according to claim 1, the voltage-power factor command value characteristic curve has a characteristic in which, within a predetermined range of the equivalent output voltage value, the power factor command value continuously changes to the lagging side as the equivalent output voltage value increases. A control device for a distributed power source.

3. A control device for supplying reactive power to a power system by a distributed power source connected to the power system, in a control device for controlling the reactive power by adjusting the power factor of the distributed power source, it is provided with a voltage-power factor command value characteristic curve in which the power factor command value is continuously changed according to the equivalent output voltage value of the distributed power source, and controls the distributed power source according to the power factor command value obtained from the voltage-power factor command value characteristic curve according to the equivalent output voltage value, means for multiplying the power factor command value by the apparent power maximum value of the distributed power source to obtain a first active power limit value, and selecting the lowest value among the first active power limit value, a second active power limit value limited by the maximum active power value that the distributed power source can output, and / or the measured active power value of the distributed power source as the active power command value; means for controlling the distributed power source using the reactive power command value, the active power command value, the measured active power value, and the measured reactive power value of the distributed power source; A control device for a distributed power source, comprising:

4. In the control device for a distributed power source according to any one of claims 1 to 3, a control device for a distributed power source that gives the result of averaging the equivalent output voltage value to the voltage-power factor command value characteristic curve to obtain the power factor command value.

5. A control program for adjusting the power factor of a distributed power source connected to a power system to control the reactive power supplied by the distributed power source to the power system, comprising: a function of generating a continuously varying power factor command value according to the equivalent output voltage value of the distributed power source from a voltage-power factor command value characteristic curve in which the power factor command value varies continuously according to the equivalent output voltage value of the distributed power source; a function of multiplying the power factor command value by the maximum apparent power of the distributed power source to obtain a first active power limit value, and selecting the lower value of the measured active power value of the distributed power source and the first active power limit value as the active power command value; a function of controlling the distributed power source using the reactive power command value, the active power command value, the measured active power value, and the measured reactive power value of the distributed power source; A control program, characterized in that it is realized by an arithmetic processing unit.

6. In a distributed power source system in which a plurality of distributed power sources are connected to the power system, configured to collectively control the plurality of distributed power sources using the control device for a distributed power source according to any one of Claims 1 to 3, the control device distributes the reactive power command value to the plurality of distributed power sources. A distributed power source system.

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