JP2015039262A - Distributed power supply facility system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve entire operation efficiency so as to also suppress increase of a cooperation point voltage in the case where a plurality of distributed power supply facilities are cooperated with a low-voltage single-phase distribution line at one cooperation point.SOLUTION: Several power computers 12 among a plurality of distributed power supply facilities 14 are power computers with reactive power regulation functions each including a function for outputting reactive power, and power computers of the remaining distributed power supply facilities are normal power computers with no reactive power regulation function. Any one of the power computers with the reactive power regulation functions outputs reactive power and the power computers of the remaining distributed power supply facilities output only active power. Each of the power computers determines whether a cooperation point voltage exceeds a predetermined value in accordance with increase of active power. Among the power computers, the power computer with the reactive power regulation function outputting the active power successively outputs reactive power so as to prevent the cooperation point voltage from exceeding the predetermined value in the case where it is predicted that the cooperation point voltage may exceed the predetermined value.

Description

  The present invention relates to a distributed power supply equipment system in which a plurality of distributed power supply equipment including a distributed power supply and a power conditioner are connected to a low-voltage single-phase distribution line at one connection point.

  As a distributed power source, there is a distributed power source of a DC energy source that generates DC power, such as a solar power generation facility, a wind power generation facility, or a fuel cell. Such a distributed power supply and a power conditioner (hereinafter referred to as a power conditioner) are combined to form a distributed power supply facility. The power conditioner converts the DC power from the distributed power supply into AC power and controls the interconnection with the power system. Supply power to the grid.

  Usually, a distributed power source facility including a distributed power source and a power conditioner is connected to a low-voltage single-phase distribution line of a power system. For example, when the distributed power source is a photovoltaic power generation facility, it is connected to a 210 V distribution line. In this case, along with the increase in the amount of solar power generation equipment installed, supply power to the power system via a transformer by connecting multiple distributed power supply equipment to a low-voltage single-phase distribution line at one connection point. There is.

  When multiple distributed power supply facilities are connected to a low-voltage single-phase distribution line at a single connection point, the voltage at the connection point of the low-voltage single-phase distribution line (lead line) connecting the distributed power supply system to the transformer must increase. There is. This is because when the power generated by multiple distributed power facilities is supplied to the power grid, the reverse power flows through the low-voltage single-phase distribution line, and the voltage at the interconnection point increases by the voltage generated by the impedance. Because it does.

  Here, when the voltage at the connection point between the power distribution system and the predetermined distributed power source is below a predetermined upper limit value and exceeds a predetermined threshold value below the upper limit value, the driving power factor of the electric power does not fall below the predetermined lower limit value. When the condition is satisfied, the power is controlled so as to increase the reactive power, the connection point voltage between the distribution system and the predetermined distributed power source exceeds the predetermined upper limit value, and the driving power factor of the electric power exceeds the predetermined lower limit value. If not, control the power to increase the reactive power, the voltage at the connection point between the distribution system and the predetermined distributed power source exceeds the predetermined upper limit, and the driving power factor of the power is the predetermined lower limit When the value is lower than the value, there is one that is controlled so as to reduce the active power and the reactive power (see Patent Document 1).

The

Japanese Patent No. 5091439

  However, in the thing of patent document 1, it controls so that each distributed power supply equipment may increase reactive power or reduce active power based on a connection point voltage, and the connection point voltage of a distributed power supply equipment may not rise. However, since each distributed power supply equipment individually controls the connection point voltage, when multiple distributed power supply facilities are connected at a single connection point, It is necessary to coordinate with voltage control.

  In addition, since each distributed power supply facility increases reactive power or decreases active power, the difference between active power output when maximum power point tracking control is performed and active power output when output suppression control is performed. The output suppression loss increases, and the operating efficiency of the distributed power supply facility decreases.

  The object of the present invention is to improve the overall operation efficiency and suppress the increase of the connection point voltage when a plurality of distributed power supply facilities are connected to the low-voltage single-phase distribution line at one connection point. It is to provide a distributed power supply equipment system.

  The distributed power supply equipment system of the present invention comprises a plurality of distributed power supply equipment comprising a distributed power source of a direct current energy source and a power converter for converting direct current power from the distributed power source into alternating current power at a single interconnection point. In a distributed power supply system that supplies power to a power system via a transformer connected to an electric wire, some power converters of multiple distributed power supply facilities have a reactive power adjustment function that has a function of outputting reactive power The power converter of the remaining distributed power supply equipment is a normal power control that does not have a reactive power adjustment function, and one of the power converters with the reactive power adjustment function outputs reactive power, and the power control of the remaining distributed power supply equipment. Outputs only active power, and each power conditioner of a plurality of distributed power supply facilities determines whether or not the interconnection point voltage exceeds a predetermined value according to the increase in active power. Among them, the power converter with reactive power adjustment function that outputs active power outputs reactive power sequentially so that the interconnection point voltage does not exceed the predetermined value when the interconnection point voltage is expected to exceed the predetermined value. And

  According to the present invention, when connecting a plurality of distributed power supply facilities to a low-voltage single-phase distribution line at a single connection point, a power converter with a reactive power adjustment function is connected, When the point voltage is expected to exceed a predetermined value, reactive power is sequentially output so that the connection point voltage does not exceed, so the overall operating efficiency can be improved and the increase of the connection point voltage can be suppressed. .

The block diagram of an example of the distributed power supply equipment system which concerns on embodiment of this invention. The block diagram of the power conditioner in embodiment of this invention. The block diagram of another example of the distributed power supply equipment system which concerns on embodiment of this invention. The block diagram of another another example of the distributed power supply equipment system which concerns on embodiment of this invention. The block diagram of the Example of the distributed power supply equipment system which concerns on embodiment of this invention. The graph which shows the relationship between the output power Px of the normal power conditioner, and the connection point voltage V1 in the Example of the distributed power supply equipment system which concerns on embodiment of this invention. The graph which shows the relationship between the output electric power Py of the power conditioner with a reactive power adjustment function in the Example of the distributed power supply equipment system which concerns on embodiment of this invention, and the connection point voltage V1. The graph which shows the relationship between the connection point voltage V1 at the time of the parallel operation of the power conditioner 12y with a reactive power adjustment function and the normal power conditioner 12x in the Example of the distributed power supply equipment system which concerns on embodiment of this invention.

  Embodiments of the present invention will be described below. FIG. 1 is a configuration diagram of an example of a distributed power supply equipment system according to an embodiment of the present invention. The distributed power sources 11a to 11n are direct-current energy sources that generate direct-current power such as solar power generation facilities, wind power generation facilities, or fuel cells. The power conditioners 12a to 12n are provided in the distributed power sources 11a to 11n, respectively, convert DC power from the distributed power sources 11a to 11n into AC power, and link to the interconnection point 13. That is, the distributed power sources 11a to 11n and the power conditioners 12a to 12n are combined to form the distributed power source facilities 14a to 14n, and the plurality of distributed power source facilities 14a to 14n are connected to the low-voltage single-phase distribution line 15 at one interconnection point 13. And supplies power to the power system 17 via the transformer 16. In addition, a distributed power supply facility side load 18 is connected to the interconnection point 13, and a power system side load 19 is connected to the power system 17 side of the transformer 16.

  Some of the plurality of power conditioners 12a to 12i among the plurality of distributed power supply facilities 14a to 14n are configured as power conditioners with a reactive power adjustment function having a function of outputting reactive power. This occurs at the impedance Z (= R + jωL) when the reverse power flow is supplied to the power system 17 when the power generated by each of the distributed power supply facilities 14a to 14n is supplied to the low-voltage single-phase distribution line 15. This is because the voltage V1 at the interconnection point 13 increases by the amount corresponding to the voltage, so that the increase of the interconnection point voltage V1 is suppressed by outputting reactive power.

  Now, some of the power conditioners 12a and 12b among the distributed power supply facilities 14a to 14n are power conditioners having a reactive power adjustment function, and the remaining power conditioners 12c to 12n of the distributed power supply facilities are normal power conditioners having no reactive power adjustment function. . For example, a single phase voltage type AC / DC converter disclosed in Japanese Patent No. 5184153 of the present applicant is used as the power converter with the reactive power adjustment function. This power converter with reactive power adjustment function is a voltage-type voltage control inverter with the same characteristics as a synchronous single-phase generator that has internal impedance and can perform reactive power control, and can calculate single-phase reactive power accurately and quickly. It has a function, for example, the AC power measuring device shown in Japanese Patent No. 238358. On the other hand, the normal power conditioners 12c to 12n are voltage-type current control type inverters that convert DC power generated by the distributed power supplies 11c to 11n into AC power.

  Then, any one of the power controllers 12a and 12b with the reactive power adjustment function, for example, the power converter 12a with the reactive power adjustment function, outputs the reactive power Qa. FIG. 1 shows a case where the power converter 12a with the reactive power adjustment function outputs not only the reactive power Qa but also the active power Pa. Moreover, the power conditioners 12b to 12n of the remaining distributed power supply facilities output only the active powers Pb to Pn.

  In this state, each of the power conditioners 12a to 12n determines whether or not the interconnection point voltage V1 exceeds a predetermined value in accordance with an increase in the active power P. FIG. 2 is a configuration diagram of the power conditioner 12. The power conditioner 12 inputs DC power from the distributed power supply 11 to the power conversion unit 20, and the power conversion unit 20 converts the DC power into AC power. At that time, the output voltage V of the power conversion unit 20 is detected by the voltage detector 21, the output current I of the power conversion unit 20 is detected by the current detector 22, and is input to the interconnection point voltage monitoring unit 23. Based on the output voltage V and the output current I, the connection point voltage monitoring unit 23 calculates its own output power P and monitors whether or not the connection point voltage V1 is expected to exceed a predetermined value. For example, the correlation between the self output power P and the connection point voltage V1 is stored in advance, and when the self output power P increases, the connection point voltage V1 exceeds a predetermined value due to the correlation. Monitor if expected.

  When the connection point voltage V1 is not predicted to exceed the predetermined value by the connection point voltage monitoring unit 23, the power conditioner 12a that has already output the reactive power Qa is maintained as it is. Similarly, the power conditioners 12b to 12n outputting only the effective powers Pb to Pn also maintain the same state. The power conditioners 12b to 12n outputting only the active powers Pb to Pn output the active powers Pb to Pn by the maximum power tracking control MPPT.

  Next, a case where the connection point voltage V1 is predicted to exceed the predetermined value by the connection point voltage monitoring unit 23 will be described. When the power conditioner 12 is a power conditioner 12a, 12b with a reactive power adjustment function, when the connection point voltage monitoring unit 23a, 23b predicts that the connection point voltage V1 exceeds a predetermined value, the control units 24a, 24b Operates so as to output reactive power so that the interconnection point voltage V1 does not exceed a predetermined value.

  For example, since the power converter 12a with the reactive power adjustment function has already output the reactive power Qa, the reactive power Qa is increased to reduce the active power Pa, and the power controller 12b with the reactive power adjustment function is connected to the power converter 12a with the reactive power adjustment function. When the interconnection point voltage V1 is expected to exceed a predetermined value even if only the reactive power Qa is output, the maximum power tracking control MPPT is stopped and the reactive power Qb is output. Further, the reactive power Qa of the power converter 12a with the reactive power adjustment function may be maintained as it is, and the power converter 12b with the reactive power adjustment function may additionally output the reactive power Qb.

  On the other hand, when the power conditioner 12 is the normal power conditioners 12c to 12n, when the connection point voltage V1 is predicted to exceed the predetermined value by the connection point voltage monitoring parts 23c to 23n, the control parts 24c to 24n are the maximum. The power follow-up control MPPT is stopped and the outputs of the effective powers Pc to Pn are reduced. Still, when it is predicted that the interconnection point voltage V1 exceeds the predetermined value, any one of the normal power conditioners 12c to 12n may be stopped.

  Actually, since the reactive power is output by the power conditioners 12a and 12b with the reactive power adjustment function, the state where the interconnection point voltage V1 is expected to exceed the predetermined value is released. Therefore, the control units 24c to 24n of the normal power conditioners 12c to 12n maintain the maximum power tracking control MPPT.

  In the above description, the case where the power converter with the reactive power adjustment function and the normal power converter are mixed is described, but all the power converters may be the power converter with the reactive power adjustment function. In this case, when the reactive power Q is not output, the power converter with the reactive power adjustment function outputs the active power P by the maximum power tracking control MPPT.

  Next, another example of the embodiment of the present invention will be described. FIG. 3 is a configuration diagram of another example of the distributed power supply equipment system according to the embodiment of the present invention. Another example is that, in contrast to the embodiment shown in FIG. 1, instead of outputting any reactive power to any one of the power converters with the reactive power adjustment function, each power converter always outputs only the active power. When the output voltage is predicted to exceed the predetermined value, the reactive power is output from the power converter with the reactive power adjustment function. The same elements as those in FIG. 1 are denoted by the same reference numerals, and redundant description is omitted.

  In FIG. 3A, the power conditioners 12a and 12b of the distributed power supply facilities 14a to 14n are power conditioners with a reactive power adjustment function, and the power conditioners 12c to 12n of the remaining distributed power supply facilities do not have a reactive power adjustment function. Usually power inverter. And each power conditioner 12a-12n always outputs only active power Pa-Pn by maximum power tracking control MPPT. In this state, the interconnection point voltage monitoring units 23a to 23n of the respective power conditioners 12a to 12n determine whether or not the interconnection point voltage V1 exceeds a predetermined value in accordance with an increase in the active power Pa to Pn.

  When the connection point voltage V1 is not expected to exceed the predetermined value by the connection point voltage monitoring units 23a to 23n, the respective power conditioners 12a to 12n are maintained as they are. On the other hand, when the connection point voltage V1 is predicted to exceed a predetermined value by the connection point voltage monitoring units 23a and 23b of the power conditioners 12a and 12b with the reactive power adjustment function, one of the power conditioners 12a and 12b is connected. Reactive power is output so that the system point voltage V1 does not exceed a predetermined value. Now, assume that the power conditioner 12a operates to output reactive power.

  FIG. 3B is a configuration diagram showing a state where the power conditioner 12a outputs the reactive power Qa while outputting the active power Pa. And even if the power conditioner 12a becomes the state which outputs only the reactive power Qa, when it is estimated that the connection point voltage V1 exceeds a predetermined value, the power conditioner 12b stops the maximum power tracking control MPPT and outputs the reactive power Qb. Note that both the power conditioners 12a and 12b may output the reactive powers Qa and Qb while outputting the active powers Pa and Pb.

  On the other hand, when the connection point voltage V1 is predicted to exceed a predetermined value by the connection point voltage monitoring units 23c to 23n of the normal power conditioners 12c to 12n, the control units 24c to 24n stop the maximum power follow-up control MPPT and the effective power Reduce the output of Pc to Pn. Still, when it is predicted that the interconnection point voltage V1 exceeds the predetermined value, any one of the normal power conditioners 12c to 12n may be stopped. Actually, since the reactive power is output by the power conditioners 12a and 12b with the reactive power adjustment function, the state where the interconnection point voltage V1 is expected to exceed the predetermined value is released. Therefore, the control units 24c to 24n of the normal power conditioners 12c to 12n maintain the maximum power tracking control MPPT.

  In the above description, the case where the power converter with the reactive power adjustment function and the normal power converter are mixed is described, but all the power converters may be the power converter with the reactive power adjustment function. In this case, when the reactive power Q is not output, the power converter with the reactive power adjustment function outputs the active power P by the maximum power tracking control MPPT.

  In the above description, each of the power conditioners 12a to 12n detects the output voltage V and the output current I of the power conditioners 12a to 12n, and based on the output voltage V and the output current I of itself, It is calculated and monitored whether or not the interconnection point voltage V1 is expected to exceed a predetermined value, but as shown in FIG. 4A, in addition to its own output voltage V and output current I, The connection point voltage V1 and the connection point current I1 are detected, the voltage V and the output current I of the connection point of the own low-voltage single-phase distribution line, the connection point voltage V1 and the connection point current of the plurality of power conditioners 12a to 12n. Based on I1, it may be determined whether the interconnection point voltage V1 exceeds a predetermined value.

  For example, in addition to the correlation between its own output power P and the connection point voltage V1, the connection point voltage V1 is determined based on the correlation between the increase in its own output power P and the increase in the connection point voltage V1. Determine if the value is expected to be exceeded. In addition, the detection of the self output voltage V and the output current I is omitted, the connection point power P1 is calculated based on the connection point voltage V1 and the connection point current I1, and the increase in the connection point power P1 is linked to the increase. Based on the correlation with the increase in the system point voltage V1, it may be determined whether or not the connection point voltage V1 is expected to exceed a predetermined value.

Further, as shown in FIG. 4B, in addition to its own output voltage V and output current I,
The terminal voltage V2 and the terminal current I2 on the distributed power source 14 side of the transformer 17 are detected, the voltage V and the output current I at the connection point of its own low-voltage single-phase distribution line, the terminal voltage V2 on the distributed power source 14 side of the transformer 17 and Based on the terminal current I2, it may be determined whether the interconnection point voltage V1 exceeds a predetermined value.

  For example, in addition to the correlation between the self output power P and the interconnection point voltage V1, the correlation between the increase in the self output power P and the increase in the terminal voltage V2 on the distributed power source 14 side of the transformer 17, It is determined whether or not the interconnection point voltage V1 is expected to exceed a predetermined value.

Further, the detection of its own output voltage V and output current I is omitted, the terminal power P2 is calculated based on the terminal voltage V2 and the terminal current I2 on the distributed power source 14 side of the transformer 17, and the increase in the terminal power P2 is calculated. It may be determined whether or not the connection point voltage V1 is expected to exceed a predetermined value from the correlation with the increase in the connection point voltage V1.

  FIG. 5 is a configuration diagram of an example of a distributed power supply facility system according to an embodiment of the present invention. In the embodiment shown in FIG. 5, a distributed power source equipment load 18, a photovoltaic power generation facility as the distributed power sources 11 x and 11 y, a normal power conditioner 12 x and a power conditioner 12 y with a reactive power adjustment function as the power conditioner, and the distributed power source facilities 14 x and 14 y are prepared. It was. The distributed power source includes the interconnection point voltage V1, the impedance of the low-voltage single-phase distribution line 15 as Z (= R + jωL), the transformer 16, the AC voltage Vac of the power system 17, and another residential load or the power grid load 19. The equipment system was configured.

  The distributed power equipment load 18 is 2 kW, the power grid load 19 is 5 kW, the AC voltage source Vac (= 200 V) is single phase, and the turns ratio of the transformer 16 is 1: 1. Further, in the embodiment, it is made stricter than the actual distribution system, the distance from the 30 kVA transformer 16 to the house is 100 m, the resistance value R of the low voltage distribution line is R = 0.9Ω, and the reactance value X is jωL. = 0.9Ω.

  In the initial state in which the outputs of the power conditioners 12a and 12b are zero, there is a power supply P0 of 2 kW from the power system side to the distributed power supply equipment side load 18, and the interconnection point voltage V1 drops to 190V.

  Next, only the normal power conditioner 12x was operated, and the change in the interconnection point voltage V1 due to the active power Px was measured. As the amount of solar radiation increases, the amount of power generated by the distributed power source 11x increases, and the interconnection point voltage V1 increases due to the power flowing backward from the power conditioner 12x to the power system 17 side. FIG. 6 shows the relationship between the active power Px of the power conditioner 12x and the interconnection point voltage V1.

  As shown by a curve S1 in FIG. 6, before the operation of the power conditioner 12x, the connection point voltage V1 becomes 190 V due to the voltage drop of the low-voltage single-phase distribution line 15 due to the power flow from the power system 17 to the distributed power equipment load 18. After the operation of the power conditioner 12x, the power supply to the distributed power supply facility side load 18 is gradually switched from the power system 17 to the power conditioner 12x, and the voltage drop of the low-voltage single-phase distribution line 15 is reduced. When the supply to the distributed power supply facility side load 18 is only the power conditioner 14x, 2kW of active power Px is supplied from the power conditioner 14x, and the interconnection point voltage V1 becomes 199V. At this time, the voltage rise of the interconnection point voltage V1 is 9.2V.

  When the power supply from the power conditioner 12x further increases and reversely flows into the distribution system, the interconnection point voltage V1 rises above 199V due to the voltage drop of the low-voltage single-phase distribution line 15. For example, when 3kW of active power Px is supplied from the power conditioner 14x, the reverse power flow power is supplied to the other power system side load 19, and the voltage increase of the interconnection point voltage V1 becomes 13.4V. It is assumed that the change in the system voltage Vac of the power system 17 can be ignored, and attention is paid to the voltage change only in the impedance Z of the low-voltage single-phase distribution line.

  Next, only the power conditioner 12y with the reactive power adjustment function was operated, and the change in the connection point voltage V1 due to the active power Py and the reactive power Qy was measured. As the output of the distributed power source 11y, which is a solar cell facility, increases, the amount of power generation increases and the output of the active power Py of the power conditioner 12y also increases. Although the interconnection point voltage V1 rises due to the reverse flow from the power conditioner 12y to the power system 17, the power conditioner 12y also generates reactive power Qy at the same time, and therefore suppresses the rise of the interconnection point voltage V1.

  FIG. 7 shows the relationship between the active power Py of the power conditioner 12y that outputs the reactive power Qy and the interconnection point voltage V1. FIG. 7 also shows a curve S1 of the active power Px by the normal power conditioner 12x. As shown by the curve S2 in FIG. 7, the voltage rise at the active power of 3 kW becomes 4.5 V due to the offset between the voltage rise by the active power Py and the voltage drop by the reactive power Qy. Compared to 12x, the voltage rise is suppressed to 8.9V.

  Even when the active power Py is 5 kW, the voltage rise is 6.1 V, and is suppressed to be lower than the system voltage Vac even during reverse power flow. The reactive power Qy at this time is about 1.3 kVar. The reactive power Qy is generated from the phase difference between the output current Iy and the output voltage Vy of the power converter 12y with the reactive power adjustment function.

  Next, only the power conditioner 12y with the reactive power adjustment function was operated, and then the normal power conditioner 12x was operated, and the change in the connection point voltage V1 due to the active power P (Py, Px + Py) and the reactive power Qy was measured. FIG. 8 shows the relationship between the interconnection point voltage V1 during parallel operation of the power converter 12y with the reactive power adjustment function and the normal power converter 12x. In FIG. 8, the curve S1 of the active power Px by the normal power conditioner 12x is also shown. As shown by the curve S3 in FIG. 8, only the power converter 12y with the reactive power adjustment function is operated, the active power P (Py) is output up to 3 kW, and then the normal power conditioner 12x is additionally operated to perform the parallel operation of the two units. did.

  The power converter 12y with the reactive power adjustment function causes the low-voltage single-phase distribution line in which the reactive power Qy is generated to have a reverse power flow of 2kW from the normal power converter 12x, but the voltage rise is 4v. With 12x alone, a voltage drop of 9.2V was observed, but a voltage of 5.2V could be suppressed during parallel operation with the power conditioner 12y. In this way, the power converter 12y with the reactive power adjustment function exhibits the function of suppressing the voltage increase of the connection point voltage V1 even when connected in parallel with the normal power converter 12x.

  In the embodiment of the present invention, by generating the active power P and the reactive power Q simultaneously from the power converter 12 with the reactive power adjustment function, it is possible to suppress the voltage increase value during reverse power flow. In addition, when a plurality of power conditioners 12 are connected to one interconnection point 13 and each power conditioner 12 outputs active power P, at least one of them outputs reactive power Q, so that during reverse power flow The voltage rise value can be suppressed.

  As mentioned above, although some embodiment of this invention was described, these embodiment is shown as an example and is not intending limiting the range of invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 11 ... Distributed power supply, 12 ... Power conditioner, 13 ... Interconnection point, 14 ... Distributed power supply equipment, 15 ... Low voltage single phase distribution line, 16 ... Transformer, 17 ... Electric power system, 18 ... Distributed power equipment side load, 19 ... Electric power system Side load, 20 ... power conversion unit, 21 ... voltage detector, 22 ... current detector, 23 ... interconnection point voltage monitoring unit, 24 ... control unit

Claims (9)

A plurality of distributed power supply facilities including a distributed power source of a direct current energy source and a power converter for converting direct current power from the distributed power source into alternating current power are connected to a low-voltage single-phase distribution line at one connection point. In the distributed power supply equipment system that supplies power to the power system via
Some of the power controllers in the plurality of distributed power supply facilities are power controllers with a reactive power adjustment function having a function of outputting reactive power,
The remaining PCs with distributed power facilities are normal power conditioners that do not have a reactive power adjustment function.
Any one of the power converters with the reactive power adjustment function outputs reactive power,
The remaining distributed power equipment power conditioners output only active power,
Each power controller of the plurality of distributed power supply facilities determines whether or not the interconnection point voltage exceeds a predetermined value in accordance with an increase in active power,
A PC with reactive power adjustment function that outputs active power among each power conditioner outputs reactive power so that the connection point voltage does not exceed the predetermined value when the connection point voltage is expected to exceed the predetermined value. A distributed power supply system characterized by A plurality of distributed power supply facilities including a distributed power source of a direct current energy source and a power converter for converting direct current power from the distributed power source into alternating current power are connected to a low-voltage single-phase distribution line at one connection point. In the distributed power supply equipment system that supplies power to the power system via
Some of the power controllers in the plurality of distributed power supply facilities are power controllers with a reactive power adjustment function having a function of outputting reactive power,
The remaining PCs with distributed power facilities are normal power conditioners that do not have a reactive power adjustment function.
Each power conditioner of multiple distributed power facilities outputs only active power,
Each power controller of the plurality of distributed power supply facilities determines whether or not the interconnection point voltage exceeds a predetermined value in accordance with an increase in active power,
The reactive power adjustment function personal computer of each power conditioner outputs reactive power so that the interconnection point voltage does not exceed a predetermined value when the interconnection point voltage is expected to exceed a predetermined value. Power supply equipment system. A plurality of distributed power supply facilities including a distributed power source of a direct current energy source and a power converter for converting direct current power from the distributed power source into alternating current power are connected to a low-voltage single-phase distribution line at one connection point. In the distributed power supply equipment system that supplies power to the power system via
Each power conditioner of a plurality of distributed power supply facilities is a power conditioner with a reactive power adjustment function having a function of outputting reactive power,
Any one of the power converters with the reactive power adjustment function outputs reactive power,
The remaining inverters with reactive power adjustment function output only active power,
Each power converter with a reactive power adjustment function determines whether or not the interconnection point voltage exceeds a predetermined value in accordance with an increase in active power,
PCs with reactive power adjustment function that output active power among each power converter with reactive power adjustment function, when the connection point voltage is expected to exceed the predetermined value, the connection point voltage should not exceed the predetermined value A distributed power supply system that outputs reactive power to A plurality of distributed power supply facilities including a distributed power source of a direct current energy source and a power converter for converting direct current power from the distributed power source into alternating current power are connected to a low-voltage single-phase distribution line at one connection point. In the distributed power supply equipment system that supplies power to the power system via
Each power conditioner of a plurality of distributed power supply facilities is a power conditioner with a reactive power adjustment function having a function of outputting reactive power,
Each power converter with reactive power adjustment function outputs only active power,
Each power converter with a reactive power adjustment function determines whether or not the interconnection point voltage exceeds a predetermined value in accordance with an increase in active power,
Each of the personal computers with a reactive power adjustment function outputs reactive power so that the interconnection point voltage does not exceed a predetermined value when the interconnection point voltage is expected to exceed a predetermined value.   Each power conditioner determines whether or not the interconnection point voltage exceeds a predetermined value based on the voltage at the connection point of its own low-voltage single-phase distribution line. The described distributed power supply equipment system.   5. The power control unit according to claim 1, wherein each power control unit determines whether the connection point voltage exceeds a predetermined value based on a voltage at a connection point of a plurality of power control units. 6. Distributed power equipment system.   5. The power control unit according to claim 1, wherein each power conditioner determines whether or not a connection point voltage exceeds a predetermined value based on a terminal voltage on the distributed power source side of the transformer. Distributed power equipment system.   Each power control unit determines whether or not the connection point voltage exceeds a predetermined value based on the voltage at the connection point of its own low-voltage single-phase distribution line and the voltage at the connection point of a plurality of power control units. The distributed power supply system according to any one of claims 1 to 4.   Each power conditioner determines whether or not the interconnection point voltage exceeds a predetermined value based on the voltage at the connection point of its own low-voltage single-phase distribution line and the terminal voltage on the distributed power source side of the transformer. The distributed power supply system according to any one of claims 1 to 4.

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