JP2002247768A - Generated power control device for power consignment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a generated power control device for a power consignment system satisfying simultaneousity and quantity equality. SOLUTION: There are provided a first compensating means for compensating a difference between the quantity of receiving power and the quantity of transmitting power in a succeeding section based on the quantity of the receiving power and the quantity of the transmitting power at every installation section using a sampling setting means in order to attain consisting between the quantity of the receiving power and the quantity of the transmitting power in a present time section in every predetermined unit time, based on the quantity of the transmitting power transferred in reverse to the power system by private-generation facilities and the quantity of the receiving power received by customers and a second compensating means for compensating a power generation command with a changing coefficient of the receiving power determined with the quantity of the receiving power in the succeeding section and the quantity of the receiving power in the present section. As explained, the value compensated by the first compensating means and the value compensated by the second compensating means are added to an average value averaged by a section width of the quantity of the receiving power in the present section, to obtain a power generation instruction in the succeeding section. Accordingly, the simultaneous supply of the same quantity can be realized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation control device in a power transfer system from a private power generation facility by a specific-scale electric power company.

[0002]

2. Description of the Related Art At present, with the liberalization of the electric power retailing section, there is a power transmission system for supplying generated power of a private power generation system connected to a power system to a customer at another place via a power transmission network of a power company. It is now possible to do it. (At present, there is a restriction with special high-voltage customers.) The business of supplying power to customers by this power transfer is called the specific-scale electric business, and the business that performs this business is called the specific-scale electric utility. The specified-size enterprise is obliged to generate or procure the power required by the contracted customer and supply it, and it is required that the amount of transmitted power and the amount of received power of the customer be matched. Specifically, it suffices that the amounts of power every 30 minutes match. This is called the same amount.

[0003] As shown in FIG. 5, the basic configuration of a current private power generation system connected to a system is a generator 1, a prime mover 2, a governor 3, a power generation controller 4, and an automatic voltage regulator (AV).
R) 5, which is connected to a local system via a circuit breaker 6, supplies power to a local load 8, and is further connected to a power system via a circuit breaker 9. As protection devices, a generator protection device 10 for protecting a generator from abnormalities and a system interconnection protection device 11 for interconnection protection with a power system are provided. The generator output is controlled by the power generation controller 4 in the private power generation equipment connected to the system, and the governor 3 is operated to follow the power generation command, thereby controlling the generator output. Here, in the power generation control, in the case of interconnection with reverse power flow, it is conceivable that the power generation constant control is performed at a point where the power generation efficiency is high in consideration of the operation rate of the private power generation facility.

[0004]

In a system interconnection with a reverse power flow for sending power to a power system, when constant power generation control is performed, the reverse power flow (reverse power) is the remaining power consumed by the local load. Power, which is up to you. When considering the consignment of this reverse transmission power, it is impossible to satisfy the same amount as a specific-scale electric power company at the current time. In order to solve the simultaneous same amount, it is necessary to change the power generation control to a control that satisfies the simultaneous equal amount, or to additionally install a control device for that.

The present invention provides a power generation control device for a power transmission system that satisfies the same amount by incorporating it into a power generation controller or giving a command from a higher order to the power generation controller based on such circumstances. Aim.

[0006]

In order to solve the above-mentioned problems, an invention according to claim 1 is provided in which a private power generation facility connected to an electric power system transmits the generated electric power back to the electric power system, and In the generated power control device for a power transfer system comprising a customer who receives the power generated from the private power generation facility via the private power generation facility, the private power generation facility measured by the watt hour meter installed in the private power generation facility is connected to the power grid. Based on the transmitted power amount transmitted and the received power amount received by the customer measured by the power meter of the customer, the received power amount and the transmitted power amount in a time section for each predetermined unit time are calculated. In order to match, the sampling setting unit that divides the time section of each predetermined unit time by a predetermined sampling, and the received power amount for each section set by the sampling setting unit On the basis of the transmitted power, the difference between the received power and the transmitted power in the current section is compensated in the next section, and the difference is averaged in the next section width to be used as a correction for the next generated power command. Correction means, and a second correction means for correcting the generated power command with respect to the fluctuation of the received power by the change rate of the received power determined from the received power amount in the previous section and the received power amount in the current section, The correction value by the first correction means and the correction value by the second correction means are added to a value obtained by averaging the received power amount in the current section by the section width, and the generated power command is set in the next section. Features.

According to a second aspect of the present invention, in the power generation control apparatus for an electric power transmission system according to the first aspect, when the received power fluctuates greatly, the sampling setting is set so as to shorten the width of the next section. It is characterized by setting by means.

According to a third aspect of the present invention, in the power generation control apparatus for an electric power transmission system according to the first aspect, the private power generation equipment connected to the power system reversely transmits the generated power to the power system. In the power generation control device for a power transfer system comprising a customer who receives the power generated from the private power generation facility via the private power generation facility, the private power generation facility measured by the watt hour meter installed in the private power generation facility is connected to the power system. Based on the amount of power transmitted backward and the amount of power received by the customer measured by the watt hour meter of the customer, the amount of power received and the amount of power transmitted in the section time for each predetermined unit time are calculated. Sampling setting means for dividing the time section of each predetermined unit time by predetermined sampling so as to match each other, and the sampling setting means for each section set by the sampling setting means. Based on the electric power amount and the transmitted electric power amount, the moving average value of the received electric power amount and the moving average value of the transmitted electric power amount are obtained from the received electric power amount and the transmitted electric power amount in the section up to and including the previous time. A third correction means for averaging the difference between the moving average value of the power amount and the moving average value of the transmission power amount in the next section and averaging the difference with the section width to correct the next generation power command; And a fourth correction unit that corrects a generated power command for a change in received power based on a change rate of received power determined from the moving average value of the received power amount and the moving average value of the current received power amount. The correction value by the third correction means and the correction value by the fourth correction means are added to a value obtained by averaging the moving average value of the received power amount by the section width, and the generated power command is made in the next section. Features.

According to a fourth aspect of the present invention, in the power generation control apparatus for an electric power transmission system according to the first or third aspect, the predetermined unit time is 30 minutes. According to the first to fourth aspects of the present invention, when a private power generation system that is connected to a system with a reverse power flow transmits power to a customer via a power system, the power installed by the customer is Based on the measured values of the energy meter and the watt hour meter installed at the power plant, the amount of power transmitted to the power plant is made to follow the amount of power received by the customer in a given unit of time, so that the amount of power transmitted is controlled at the same time. It is possible to provide a generated power control device for a power transfer system.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a power generation control device for a power transfer system according to a first embodiment (corresponding to claims 1 and 4) of the present invention.

This embodiment is obtained by further adding the following configuration to the conventional power generation system shown in FIG. That is,
A watt-hour meter 13 that detects the amount of power transmitted from the private power generation facility 100 to the power system 300, a watt-hour meter 23 that detects the amount of power received by the customer 200 from the power system 300, and the watt-hour meter 13. Based on the detected transmitted power amount and the received power amount detected by the watt-hour meter 23, a power transmission / transmission power control device 12 for providing a power generation command to the power generation controller 4 to simultaneously satisfy the same amount is newly installed. Things.

The electric power transferred via the electric power system 300 is supplied to the load 21 via the circuit breaker 22. Further, in order to transmit the information on the amount of power received by the consumer detected by the watt-hour meter 23 to the power generation control device 12 for power transmission, existing communication equipment such as a telephone line is used as communication means. Can be considered.

FIG. 2 is a graph illustrating generated power control by the generated power control device for the power transfer system of FIG.
As shown in FIG. 2, to satisfy the same amount at the same time that the amount of power received by the customer for 30 minutes matches the amount of power transmitted to the private power generation facility,
The time of 0 minute is divided into, for example, every 5 minutes, and the power command of the private power generation facility is determined by acquiring the power received by the customer and the power transmitted by the private power generation facility by sampling, thereby controlling the generated power. PL in FIG. 2 represents the transition of the customer received power.

The current sampling interval is tn, the previous sampling interval is tb, and the next sampling interval is ta.
And Pb is the previous sampling interval (tb interval)
Is the average value of the amount of power received by the customer determined from the transition of PL in the above. Similarly, Prn represents transmission power in the current sampling section. In the section of tn, a difference of (Pn−Prn) × tn occurs between the power received from the customer and the power transmitted from the private power generation equipment. In order to realize the same amount at the same time, it is necessary to fill the difference. Therefore, in order to add the electric energy corresponding to the difference to the next section, the difference is averaged over the next section width (ta), and the correction value for the power command is obtained. (First correction). That is, (Pn-Pr
n) × tn / ta, but since tn = ta, (Pn−
Prn) is the first correction.

However, as shown by PL in FIG. 2, if the customer received power fluctuates (increases in this figure), the first
If the difference is corrected only in the next section as in the case of the correction described above, the difference always remains, and it may be a large difference. On the other hand, as in the case where the average value of the amount of electric power received by the customer has changed from Pb of the previous time (section of tb) to Pn of this time (section of tn), the same applies from the current time to the next time (section of ta). , The correction is performed according to the rate of change from Pb to Pn. This is the second correction. If the rate of change from the previous Pb to the current Pn is A, then A = (Pn-Pb) / ((tb + tn) / 2).

When this rate of change is applied from this time to the next time, the correction amount is determined by A × ((tn + ta) / 2). Since tb = tn = ta, the second correction is (Pn
-Pb). Therefore, the next sampling interval (t
The power command value in a) is obtained by adding the first correction value and the second correction value based on the average value Pn of the current customer received power. Pra in FIG. 2 indicates a power command value in the next sampling section (ta).

Such determination of the power command can be realized by configuring the power transmission power generation control device 12 with a microcomputer or the like. If a means for determining the sampling is provided, the sampling can be performed in five minutes. Without limitation, it is possible to set a shorter sampling in order to increase the control accuracy of the same amount at the same time.

FIG. 3 shows a second embodiment of the present invention.
10 is a graph for explaining control of generated power in the power transfer system (corresponding). In the present embodiment, if the difference between the previous customer received power amount and the current customer received power amount is large in the embodiment of FIG. In this case, it is possible to easily follow the fluctuation of the power received by the customer by shortening the time width.

The meanings of the same symbols in FIG. 3 as in FIG. 2 are the same as those in FIG. In the case where the amount of power received by the customer greatly changes between the sections tb and tn, as shown in FIG. 3, for example, the sampling is shortened from 5 minutes at tn to 2.5 minutes at ta. tn is the current sampling interval. The next sampling interval ta is shorter than tn, and the power command value Pra2 at ta is determined based on the width of ta. tn
In the section, there is a difference of (Pn-Prn) × tn between the power received from the customer and the power transmitted from the private power generation equipment. As in the embodiment of FIG. 2, the first correction for averaging the difference with the next section width (ta) in order to add the electric energy corresponding to the difference to the next section is (Pn-Prn)
× tn / ta, and in this case, (Pn−Prn) × 2
Becomes

Further, in the second correction, similarly to the embodiment of FIG. 2, the rate of change from the previous Pb to the current Pn is A =
(Pn−Pb) / ((tb + tn) / 2), and the correction amount is A × ((tn + ta) / 2) = (Pn−Pb) ×
It is determined by (tn + ta) / (tb + tn). In this case, since tb = tn and ta = tn / 2, the second correction is (Pn−Pb) × 3/4. In this manner, by changing the sampling time width and setting the correction amount according to the time width, it becomes easy to follow up even if the customer received power changes rapidly.

In this embodiment, if the power transmission / reception power control device 12 is constituted by a microcomputer or the like in the same manner as in the embodiment of FIG. 2, the previous customer's received power amount and the current customer's received power amount are calculated. The change of the sampling setting in the means for determining the sampling based on the difference can be realized.

FIG. 4 shows a third embodiment of the present invention.
And FIG. 4 is a graph for explaining control of generated power in a power transfer system according to claim 4). As mentioned in the embodiment of FIG. 2, it is considered that the short sampling interval can contribute to the improvement of the control accuracy of the same amount. However, if the customer received power fluctuates in a short time, it may cause noise disturbance to the control system.
The purpose is to match the power received by the customer for 30 minutes with the power transmitted by the private power generation equipment. Do not issue frequent power generation commands such as sudden increase or decrease commands.

In the symbols in FIG. 4, the same symbols as those in FIG. 2 have the same meaning. In FIG. 4, for example, sampling is performed for one minute, and a moving average is obtained in five sections (five minutes). Pbh is a moving average of the amount of power received by the customer up to the previous sampling interval (tb). Similarly, Pnh is a moving average of the amount of power received by the customer up to the current sampling interval (tn). Prnh represents a moving average of the transmitted power amount up to the current sampling interval. t
By acquiring the moving average value at the timing of n, the moving average value of the power received from the customer and the moving average value of the power transmitted from the private power generation facility are converted into the power received from the customer and the power transmitted from the private power generation facility. Is (Pnh-Prnh) × t
There is a difference of n. In order to realize the same amount at the same time, it is necessary to fill in the difference. Therefore, in order to add the electric energy corresponding to the difference to the next section, the difference is set to the next section width (t
Averaged in a) to obtain a correction value (first correction) for the power command. That is, (Pnh-Prnh) × tn / t
Although it is a, since tn = ta, (Pnh-Prnh) is the first correction.

However, if the customer received power fluctuates (increases in this figure) as shown by PL in FIG. 2, the difference is corrected only by correcting the difference in the next section as in the first correction. Will always remain, which can also be a large difference. On the other hand, it is assumed that the same fluctuation occurs from this time to the next time (moving average until ta), as in the case where the moving average value of the electric power received by the consumer changes from the previous Pbh to the current Pnh. Then, correction is performed according to the rate of change from Pbh to Pnh. This is the second correction. If the rate of change from the previous Pbh to the current Pnh is A2, then A2 = (Pnh-Pbh) / ((tb + tn) / 2).

When this change rate is applied from the current time to the next time, the correction amount is determined by A × ((tn + ta) / 2). Since tb = tn = ta, the second correction is (P
nh-Pbh). Therefore, the power command value in the next sampling section (ta) is obtained by adding the first correction value and the second correction value based on the moving average Pnh of the customer received power up to this time. Pr in FIG.
a3 indicates a power command value in the next sampling section (ta). When the sampling interval is set short in this way, taking a moving average cancels out the short-term up and down movements of the customer's received power, and captures it gently to frequently raise a sudden increase or decrease in the power generation command. It is possible to follow the power by not outputting the power.

[0026]

As described above, according to the present invention,
When a private power generation system that is connected to the grid with reverse power flow transfers power to consumers via the power grid, the measured values of the watt hour meter installed at the customer and the watt hour meter installed at the power plant are used. Based on the above, it is possible to provide a generated power control device for a power transmission and transmission system that performs power amount control to simultaneously make the same amount by making the transmitted power amount of the power plant follow the received power amount of the customer in a predetermined unit time. it can.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a power generation device for a power transfer system according to a first embodiment of the present invention.

FIG. 2 is a graph for explaining the operation of the first embodiment of FIG. 1;

FIG. 3 is a graph for explaining the operation of the second embodiment of the present invention.

FIG. 4 is a graph for explaining the operation of the third embodiment of the present invention.

FIG. 5 is a configuration diagram of a private power generation facility that performs reverse power flow operation by a conventional generated power control device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Generator, 2 ... Prime mover, 3 ... Governor, 4 ... Generator controller, 5 ... AVR, 6, 7, 9, 22 ... Breaker, 8,
Reference numeral 21: load, 10: generator protection device, 11: grid connection protection device, 12: power generation control device for power transmission, 13, 2
3: Electricity meter, 100: Private power generation equipment, 200: Consumer, 300: Electric power system.

Continuing on the front page (72) Inventor: Sei Ito 1000, Hamada, Aboshi-ku, Himeji-shi, Hyogo Nishiba Electric Machinery Co., Ltd. ) Inventor Tomoya Ichino 1000 Hamada, Aboshi-ku, Himeji-shi, Hyogo F-term inside Nishiba Electric Machinery Co., Ltd.

Claims (4)

[Claims] 1. An electric power transmission system comprising a customer connected to an electric power system, a private power generation facility sends the generated electric power back to the electric power system, and receives a supply of the generated electric power from the private electric power generation facility via the electric power system. Power generation control device for
The amount of transmitted power that the private power generation facility was back-fed to the power system, measured by the watt hour meter of the private power generation facility installation,
On the basis of the received power amount received by the customer measured by the power meter of the customer, based on the received power amount and the transmitted power amount in a time section for each predetermined unit time, the predetermined unit Sampling setting means for dividing the time section of each time by predetermined sampling, and the received power amount and transmission power in the current section based on the received power amount and the transmitted power amount for each section set by the sampling setting means. First correction means for averaging the difference with the next section width to compensate for the difference in electric power amount in the next section and correcting the next generated power command; Second correction means for correcting a generated power command for a change in received power based on a change rate of received power determined from the received power amount in the section, and A power generation command for a power transfer system, wherein a correction value by the first correction means and a correction value by the second correction means are added to a value averaged by a width to generate a power generation command in a next section. Control device. 2. The generated power control for a power transfer system according to claim 1, wherein when the received power fluctuates greatly, the sampling setting means sets the width of the next section to be short. apparatus. 3. An electric power transmission system comprising a customer connected to a power system, a private power generation facility that transmits the generated power back to the power system, and receives a supply of the generated power from the private power generation facility via the power system. Power generation control device for
The amount of transmitted power that the private power generation facility was back-fed to the power system, measured by the watt hour meter of the private power generation facility installation,
Based on the amount of power received by the consumer measured by the watt hour meter of the customer, the predetermined unit time for matching the received power and the transmitted power in the section time for each predetermined unit time Sampling setting means for dividing a time interval within each time interval by predetermined sampling; and the power receiving power of the current and previous sections based on the received power amount and the transmitted power amount for each interval set by the sampling setting means. The moving average value of the received power amount and the moving average value of the transmitted power amount are obtained from the power amount and the transmitted power amount, and the difference between the moving average value of the received power amount and the moving average value of the transmitted power amount in the next section is obtained. Third correction means for averaging the difference with the section width to compensate for the next generated power command to compensate for the difference,
A fourth correction means for correcting a generated power command for a change in received power based on a change rate of received power determined by a moving average value of the previous received power amount and a moving average value of the current received power amount; Adding a correction value by the third correction means and a correction value by the fourth correction means to a value obtained by averaging the moving average value of the received power amount by the section width to generate a power generation command in the next section. A power generation control device for a power transfer system, comprising: 4. The power generation control device for a power transmission system according to claim 1, wherein the predetermined unit time is 30 minutes.