JPH0556563A - Power flow controller in distribution system - Google Patents

Abstract

PURPOSE:To alleviate the burden on an operator by switching automatically a connection bus bar of a load so that the flow of bus link may come near zero when a bus link breaker trips at the time of arranging the receiving power. CONSTITUTION:This system is provided with a control power calculating means 26 which calculates a control power value by comparing a flow power value inputted into a bus link flow inputting means 23 with a control set value obtained from a control set value storing means 15 and a control direction determining means 27 which discriminates the polarity direction of control power. Based on the control power value and the discriminated polarity direction, a guidance generating means 30 is allowed to generate items required for controlling.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power flow for controlling a power flow passing through a bus breaker in a power distribution system in which a load is fed from a double bus of a power receiving bus of an electric power company and a power generating bus of a private power generation facility. The present invention relates to a control device.

[0002]

2. Description of the Related Art FIG. 3 is a block diagram showing a power distribution system according to the prior art and the present invention disclosed in, for example, Japanese Patent Publication No. 22610/1990, in which 1 is a power company and 2 is a power receiving circuit breaker of a customer. 3 is a power receiving protection system that detects an accident on the power receiving side on the side of the power company or on the customer side. 4 is a power receiving transformer that steps down the power receiving voltage to the distribution voltage within the customer. 5 is a connection between the power receiving transformer 4 and the power receiving bus 6. A power receiving secondary circuit breaker, 7 is a power generating busbar connected to a private generator 9 via a power generating circuit breaker 8.

Further, 10 is a bus breaker for connecting the power receiving bus 6 and the power generating bus 7, 11 is a power flow detector for detecting a power flow passing through the bus breaker 10, and 12 is a transformer for an instrument. 13 is a current transformer for measuring instruments, 14 is a factory load as a load, 15 is a load disconnecting circuit, 16 is a fan-shaped double throw disconnecting circuit as a connection disconnecting switch on the load side, and power is generated when the mother circuit breaker 10 is closed. The busbar 7 and the power receiving busbar 6 can be switched, and during the switching, power can be supplied to the load 14 from both the power generating busbar 7 and the power receiving busbar 6 at the same time.

Next, the operation will be described. First, the power receiving circuit breaker 2 and the power receiving secondary circuit breaker 5 are closed, the power receiving bus bar 6 is connected to the power company, and the private power generator 9 is operated.
It is assumed that the power generation breaker 8 is closed. Further, the power generating bus 7 is also charged, the bus breaker 10 is closed, and the power receiving bus 6
And the power generation bus 7 are connected. Here, of the loads, the important load is the fan-shaped double-throw disconnector 16 and the power generation bus 7
For the non-important load, the fan-shaped double throw disconnector 16 is used to
Connect to each.

Now, when the power reception protection system 3 detects an accident in the power reception system, the protection interlock causes the power reception breaker 2 and the mother circuit breaker 10 to trip. As a result, the power receiving circuit is disconnected, the load 14 connected to the power receiving bus 6 has a power failure, and the load 1 connected to the power generating bus 7 is disconnected.
Power is supplied to the generator 4 from the private generator 9.

[0006] By the way, immediately before the main circuit breaker 10 trips, if the power flow passing through the main circuit breaker 10 flows from the power receiving bus 6 to the power generating bus 7 side (power reception is large), Immediately after the trip of the main circuit breaker 10, the private generator 9 from the electric power of the load 14 connected to the power generating bus 7.
Output power is insufficient, the frequency of the power generating bus 7 decreases.

On the other hand, when the power flow passing through the bus breaker 10 immediately before the trip is in the direction (large power generation) flowing from the power generation bus 7 to the power reception bus 6, conversely, the private power generator 9
Output becomes excessive, the frequency of the power generating bus 7 becomes high. In any of these cases, the speed governor of the prime mover of the private power generator 9 operates and is controlled to have a prescribed frequency. However, when the power flow in the mother circuit breaker 10 immediately before the trip is large, the speed immediately after the trip is obtained. The fluctuation of the frequency on the power generating bus 7 becomes large.

In order to reduce such frequency fluctuation, it is necessary to keep the power flow passing through the mother circuit breaker 10 as close to zero as possible. For this reason, the operator constantly monitors the passing electric power of the mother circuit breaker 10, and if necessary,
It is necessary to change the connecting busbar of the load 14.

[0009]

Since the conventional power distribution system is configured as described above, the operator always disconnects the mother power line in order to continue the stable operation of the private power generation system when the power receiving system is disconnected. There is a problem that it is necessary to monitor the passing electric power of the equipment 10 and to judge how much the load 14 should be switched and connected to the connecting bus bar if necessary.

The invention of claim 1 has been made to solve the above-mentioned problems, and it is not necessary for the operator to monitor the passing power of the bus breaker, and it is necessary to switch the load to the connecting busbar. An object of the present invention is to obtain a power flow controller for a distribution system that can assist driving so that an operator does not have to perform the work of determining the amount and the switching direction.

Further, according to the invention of claim 2, the characteristics of each load are set in advance, and the connection state of the load is input, whereby a more advanced operation support of the power distribution system can be realized. The purpose is to obtain a control device.

[0012]

According to a first aspect of the present invention, there is provided a power flow control device for a power distribution system, wherein a power flow power value input to a mother power flow input means and a control setting obtained from a control set value storage means. A control power calculating means for comparing the control power value with the value and a control direction determining means for determining the polarity direction of the control power are provided, and the control power value and the determined polarity direction are The guidance generation means is made to generate control necessary items.

According to a second aspect of the present invention, there is provided a power flow control device for a power distribution system, comprising load characteristic setting storage means for setting and storing a normal power consumption value of a load and a power receiving / power generation switching priority order, a control power value, and this control. A busbar switching load selecting means for selecting a load to be switched and connected to the connecting busbar based on the polarity direction of the electric power, the normal power consumption value of the load and the switching priority order, and the guidance generating means is provided with a busbar in the polarity direction of the control power. The switching direction and the selected load name of the bus to be switched are set as guidance.

[0014]

The control power calculation means in the invention of claim 1 obtains the control power value from the difference between the power flow power value input to the mother continuous power flow input means and the control set value, and based on this control power value. The required control items are generated from the determined direction of the power flow flowing through the main circuit breaker, and appropriate driving support can be realized according to the guidance that is the generated output.

The busbar switching load selecting means in the invention of claim 2 is such that the control power value, the polarity direction of the control power,
Based on the normal power consumption value of the load and the switching priority, select the load that is switched and connected to the connection destination bus, set the bus switching direction from the above polarity direction and the name of the bus switched load as guidance, and output this. By doing so, the number of driving support items is increased, that is, the work items of the operator are reduced, and power flow control by more advanced driving support can be realized.

[0016]

EXAMPLES Example 1. An embodiment of the invention of claim 1 will be described below with reference to the drawings. In FIG. 1, reference numeral 21 indicates FIG.
The circuit breaker state input means for inputting the open / closed states of the mother circuit breaker 10 and the power generation breaker 8 shown in FIG. 22 is a fan-shaped double-throw disconnecting switch 16 and a load circuit breaker 15 for switching the connecting bus bar of the load 14.
Disconnector / circuit breaker state input means for inputting the state of 23, 23 for mother power flow input means for inputting the passing power of the mother circuit breaker 10, and 24 for input determination for determining whether control is necessary by inputting the breaker state. These are means and constitute the input processing unit 43. Reference numeral 25 is a control set value storage means for setting and storing the control set value of the mother power flow.

Further, 26 is a control power calculation means for calculating a control required power value from the control set value and the input mother continuous power value, 27 is a control direction determination means for determining the polarity direction of the control power, and 28 is. Load characteristic setting storage means 29 is a busbar switching load selecting means for selecting a busbar switching required load from the control power value obtained by the control power computing means 26, the polarity direction, and the load characteristic obtained from the load characteristic setting storage means 28. From the polar direction to the busbar switching direction and the busbar switching required power,
It is guidance generation means for generating a switching required load name as guidance as necessary, and these are arithmetic processing units 44.
Are configured. The load characteristic setting storage means 28 constitutes the set value storage section 42 together with the control set value storage means 25. Reference numeral 31 is a guidance output unit, which constitutes a guidance output unit 45.

Next, the operation will be described with reference to the flowchart of FIG. First, the open / closed states of the mother continuous circuit breaker 10 and the power generation circuit breaker 8 are fetched into the circuit breaker state input means 21 (step ST1). If any of these is open, the flow control is meaningless, and the subsequent flow does not Do not proceed (step ST2),
On the other hand, when both are closed, the state of whether the fan-shaped double throw disconnector 16 of each load 14 is connected to the power receiving bus 6 or the power generating bus 7 is input by the disconnector / breaker state input means 22. Further, it inputs whether each load circuit breaker 15 is open or closed (step ST3).

Next, the passing electric power value of the master-series circuit breaker 10 is inputted from the mother-series power flow input means 23 (step ST4),
The input determination output means 24 determines whether or not the input value is preset in the control set value storage means 25 and is stored in the control set value (step ST5). Is unnecessary, the process does not proceed to the subsequent flow and returns to the process of step ST1. On the other hand, if the power is out of the control set value, power flow control is required. Therefore, the control power calculation unit 26 adjusts the difference between the mother power input to the power flow input unit 23 and the set value by the control power calculation unit 26. Is calculated (step ST6).

Next, the control direction determining means 27 checks the polarity of the calculated adjusted power value (step ST7), and if the polarity is in the direction from the power receiving bus 6 side to the power generating bus 7 side, it means that the power receiving is large. , A signal indicating that the load 14 connected to the power generating bus 7 needs to be switched to the power receiving bus 6 (step ST8). On the other hand, if the polarity of the adjusted power value is in the direction from the power generating bus 7 side to the power receiving bus 6 side, the signal indicating that it is necessary to switch the load connected to the power receiving bus to the power generating bus 7 as the power generation is large. Is generated (step ST9).

Next, based on the signals thus generated, the busbar switching load selecting means 29 selects the switching required load (steps ST10 and ST11), and then the switching required power value is generated by the guidance generating means 30. Is generated as guidance (steps ST12 and 13), and the guidance is output from the output means 31 (step S).
T14).

Example 2. Next, an embodiment of the invention of claim 2 will be described. In this embodiment, the constant power consumption value of each load 14 and the ranking of the importance of each load 14 are set and stored in the load characteristic setting storage means 28 in advance.
Thereby, the busbar switching direction generated in the first embodiment, that is, the direction in which the load 14 connected to the power generation busbar 7 is switched to the power reception busbar 6 or the load 14 connected to the power reception busbar 6 is generated. It is determined whether the direction is to switch to 7. And
When the direction is the former, the load 14 connected to the power generating bus 7 is selected as the switching target load, and conversely, when the direction is the latter, the load 14 connected to the power receiving bus 6 is selected as the switching target load. .. That is, according to the busbar switching direction, it is possible to select the load corresponding to that direction.

Next, based on the required switching power value calculated in the same way as in the first embodiment, the constant power consumption of the target load 14 is switched to the required switching power value according to the priority order of the selected target loads 14 described above. , Selected and added. The load thus selected is set as the switching required load and is output as the guidance together with the guidance generated in the first embodiment, whereby the operation work of the operator can be reduced and more appropriate driving support can be realized. ..

[0024]

As described above, according to the first aspect of the present invention, the power flow power value input to the mother power flow input means is compared with the control set value obtained from the control set value storage means. ,
A control power calculation means for calculating a control power value, and a control direction determination means for determining the polarity direction of the control power,
Since the guidance generation means is configured to generate the control necessary items from the control power value and the determined polarity direction, the work of the operator can be simplified and proper driving support can be realized, and thus the power distribution can be performed. There is an effect that a stable system can be easily operated.

According to the second aspect of the present invention, the load characteristic setting storage means for setting and storing the normal power consumption value of the load and the power reception / power generation switching priority order, the control power value, the polarity direction of the control power, A busbar switching load selecting means for selecting a load to be switched and connected to the connection destination busbar based on the normal power consumption value of the load and the switching priority order, and the guidance generating means, from the polarity direction of the control power, to the busbar switching direction and selection. Since it is configured to set the load name to be switched on the selected bus as guidance, by selecting the required switching load and outputting that load as guidance,
Further, driving support items are added, and there is an effect that a power flow control by more advanced driving support can be realized.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a power flow controller for a distribution system according to an embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the power flow controller of FIG.

FIG. 3 is a single-line connection diagram showing a power distribution system according to the related art and the present invention.

[Explanation of symbols]

 1 Electric Power Company 6 Power Receiving Bus 7 Power Generating Bus 8 Generation Breaker 9 Private Generator 10 Mother Circuit Breaker 14 Load 16 Fan-shaped Double Thrust Breaker (Connection Breaker) 21 Breaker Status Input Means 22 Breaker / Circuit Breaker Status Input Means 23 mother continuous power flow input means 24 input determination means 25 control set value storage means 26 control power calculation means 27 control direction determination means 28 load characteristic setting storage means 29 busbar switching load selection means 30 guidance generation means 31 output means

Claims (2)

[Claims] 1. A mother circuit breaker that connects a power receiving bus that receives power from a power company and supplies power to a load and a power generating bus that supplies power to a load from a private generator, and input a power flow value of the mother circuit breaker. A mother continuous power flow input means, a circuit breaker state input means for inputting an open / closed state of the power generating circuit breaker connected to the mother circuit breaker and the private power generator, and a power flow control requirement from the open / closed state. Input determination means for determining whether or not there is obtained from the control set value storage means for setting and storing the set value for the power flow control, the power flow power value input to the mother continuous power flow input means and the control set value storage means. From the control power calculation means for comparing the control set value obtained and the control power value, the control direction determination means for determining the polarity direction of the control power, and the control power value and the determined polarity direction. Guidan generating control requirements A power flow control device for a power distribution system, comprising: a power generation unit and an output unit that outputs the guidance. 2. A mother-circuit breaker that connects a power-receiving bus that receives power from a power company and supplies power to a load to a power-generating bus that supplies power to a load from a private generator, and input a power flow value of the mother-circuit breaker. Mother power flow input means, circuit breaker state input means for inputting open / closed states of the power generation circuit breaker connected to the mother circuit breaker and the private generator, the load side circuit breaker and the connection disconnector Is connected to either the power receiving bus or the power generating bus, and a load side disconnector / circuit breaker state input means, and input determining means for determining whether or not power flow control is necessary from the state of each circuit breaker. And a control set value storage means for setting and storing the set value for power flow control, a power flow power value input to the mother continuous power flow input means, and a control set value obtained from the control set value storage means. Control power to calculate power value A calculation means, a control direction determination means for determining the polarity direction of the control power, a load characteristic setting storage means for setting and storing the normal power consumption value of the load and a power reception / generation switching priority order, the control power value, A busbar switching load selecting means for selecting a load to be switched and connected to the connection destination busbar based on the polarity direction of the control power, the normal power consumption value of the load and the switching priority, and the busbar switching direction and the busbar switching direction from the polarity direction of the control power. A power flow control device for a power distribution system, comprising: guidance generating means for setting a load name to be switched to a bus as guidance and output means for outputting the guidance.