JPS6271442A - System stabilizer - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a system stabilizing device, and particularly to a system stabilizing device that stabilizes a power system during power system fluctuations.

[Technical background of the invention]

In recent years, as electric power systems have become larger and more complex, the spread of grid failures due to K, such as tax regulations, has become a major problem. Therefore, as a countermeasure to this problem, a system stabilization device is installed that stabilizes the system by turning on the power, interrupting the system, and applying load to the power station when the system is in turmoil.

FIG. 8 shows a general configuration diagram of such a system stabilizing device. In Fig. 8, 71 is a terminal device that is installed in power plants and substations located in various locations in multiple systems, and is used to collect information such as local voltage information, current information, power information, and 0N10FF information such as CB and LS of the system. It has the function of introducing lineage information into the system. Reference numeral 72 is a central processing unit installed at a representative power plant or substation, which receives various system information introduced at the terminal device 71 via the transmission system 73, and combines it with the information from the terminal device at 0. Perform the necessary processing to stabilize the system,
It has a function of sending the processing results to the terminal device 71 using the transmission system 73. The transmission system 73 is connected to the central processing unit 72 together with each terminal device 71 other than 0, and has a function of transmitting system information introduced at each terminal device to the central processing unit and stabilizing the system of the central processing unit. It has a function to transmit processing results to each terminal device.

The system stabilizing device described above has automatic monitoring functions such as constant monitoring and inspection so that it can operate reliably during system fluctuations. Conventionally, this automatic monitoring was performed on each terminal device 7.
1. This is done for each of the central processing unit 72 and the transmission system 73, and when an unnecessary occurrence occurs, alarm 1 is displayed in each device.

[Problems with background technology]

In the conventional device having the above configuration, even if it is possible to detect defective lines on each device side, it is difficult to detect device defects as a system. For example, if a defect occurs in the input section of a terminal device and the desired result cannot be obtained, in order to detect this on the terminal device, a configuration such as monitoring using two large power sections is required. This increases the hardware scale of the entire system.

[Purpose of the invention]

The present invention has been made to solve the above-mentioned problems, and it is a specific object of the present invention to provide a system stabilizing device capable of detecting device failures in the system as a whole.

[Summary of the invention]

In the present invention, information from each terminal device that is taken into the central processing unit via the transmission system and information from the zero location are used to connect the central processing unit installed in the control center and the terminal equipment installed in the controlled station. The objective is to collectively monitor equipment failures in the transmission system that connects these systems based on the rationality of the system.

[Embodiments of the invention]

Examples will be described below with reference to the drawings. FIG. 1 is a system configuration diagram of an embodiment of a system stabilizing device according to the present invention. In addition, in FIG. 1, terminal devices 71A and 71B are installed at four power stations A, B, C, and D, respectively.

71C and 71D, and a transmission system 73A is provided between these and a central processing unit 72P provided in the substation P.

It is shown as a configuration diagram connected by 73B, 73C, and 73D.

In Figure 1, 11 is the busbar of the substation, 12A to 12D
is a generator, 13A to 13Fa are power transmission lines connected to the busbars, 14A to 14F are current transformers installed on each power transmission line, and 15A are
-15F is the instrument transformer installed on each power transmission line, 16A-16
17A to 17D are transformers of each power plant. The terminal device 71A includes a current transformer 14A and an instrument transformer 1.
5A, the current and voltage of the power transmission line 13A and the interrupter Z 6 B (1) ON10FF condition are taken in. Similarly, other terminal manufacturing shops 2 to 4 also receive current from the corresponding power transmission line,
The voltage and interrupter 0N10FF conditions are taken in. On the other hand, in the central processing unit 72P provided in the substation P, the current transformer 14) i8.14F and the voltage transformer 15E.

15F connects to the current, voltage and busbar of power lines 131 and 13F, and the interrupter conditions are captured, respectively. Note that the central processing unit 72P receives each piece of information from each of the terminal devices M1-M4 via the transmission systems 73A to 73D.

FIG. 2 is a configuration diagram of an embodiment of the terminal device.

In FIG. 2, 21A and 21B are voltage input converters and current input converters, 22 is a power converter, and 23A to 23
C is a filter, 24A to 24C are sample hold circuits, 25 is a multiplexer, 26 is a linear converter, 27a
It is a P/8 converter. There are 21 input converters for voltage and current from the power grid.

21B and a power converter 22, where it is converted into a voltage signal of an appropriate magnitude. After harmonic components are removed from each of these outputs by analog filters 23A to 23C,
0 sample hold circuits 24A to 24 sampled at predetermined intervals by sample hold circuits 24A to 24C
The output from C is input to the N1 converter 26 via the multiplexer 25, where it is converted into a digital value and then converted to a P/S converter (hereinafter referred to as P/S converter) along with 0N10FF information such as interrupter conditions. ) 27 into a serial signal and sent to the transmission system.

FIG. 3 is a block diagram of an embodiment of the central processing unit. Third
In the figure, each voltage and current input to the power transmission lines 13g and 13F' are input to input converters 21C, 21D (21E, 21F).
, is input via the power converter 22A (22B),
Analog filter 230~23F (23G~23K),
Sample hold times'Nr24D ~24F (24G
~24I), multiplexer 25. A/1) Converter 2
6 into a digital value of an appropriate size is the same as in the case of the terminal device already explained with reference to FIG.

On the other hand, the digital serial signals transmitted from each terminal device 71A to 71D of 41 to Tomb 4 via each transmission system 73A to 73D are sent to a 7 real/parallel converter (S/P converter) on the substation side. 31A to 31D, the above-mentioned digital signals and interrupters, etc. 0N10F
Along with the F information, a direct memory access circuit (hereinafter referred to as DMA) 32K! °, is written to a predetermined address in the memory circuit ◎The contents of this memory circuit are
Calculations are performed by the CPU 34 according to a program stored in advance in the ROM 35, and control commands, alarms, displays, etc. are outputted from the output circuit 36 based on the results of the calculations.

FIG. 4 is a functional diagram illustrating nine monitoring functions added to the system stabilization calculation.

In FIG. 4, 41A to 41F are the generated power amount (p, to pD) and the load power amount (Pg t P?) of each power plant stored in the memory circuit 33.

That is, the adder circuit 42A calculates the total amount of generated power and calculates 1,
The adder circuit 42B calculates the total amount of load power. The output of each adder circuit is then added to an arithmetic judgment circuit 43,
p, -g(p2 (p, +1) is determined, that is, this determination is based on Naka-Ruchhoff's law and uses the fact that P and P2 are equal to detect a defect in the device.

Note that 8 is an error of the device, which is determined by errors of the power converter, the ~Φ converter, etc. Therefore, the processing contents are as shown in the flowchart of Fig. 5, and when the above judgment is satisfied, the third
The output of the operation determination circuit 43 shown in the figure is rlJ, and the apparatus normal processing circuit 44 performs normal processing. When the above judgment is not satisfied, the output of the calculation judgment circuit 43 becomes "0", and via the inverter circuit 45, the device abnormality processing circuit 46 generates an alarm indicating that the device is defective, and locks the output of the stabilization calculation. .

FIG. 6 is a configuration diagram for explaining another embodiment of the monitoring function, and this embodiment is based on the rationality of the circuit configuration. As is clear from Fig. 6, when the generator is outputting power, the breaker CB of the power transmission line corresponding to the generator is
It is based on the rationality of being in a state of "in". Here, the arithmetic circuits 61A to 61D indicating the monitoring function are circuits that determine whether each of the generators 12A to 12D shown in FIG. 1 is generating power.

62A to 62D are circuits for determining whether the interrupter CB on the busbar side of the power transmission line connected to each generator is in the "on"state;
63A to 63D are circuits that determine whether the generator-side interrupter CB of the power transmission line connected to the generator is in the "on" state. When the above-mentioned double-end breaker CB is in the "on" state, the output is rlJ, and the AND? -) For 65A to 65D, all generators are generating power and AND? -) Output of 64A to 64D is r31
When , rationality is established and the output is rlJ.

Further, when each of the generators in the AND gates 66A to 66D is generating power and the inhibit signal of the output of the AND gates 4A to 64D is "l", rationality does not hold and the output becomes "l". When the outputs of the AND gates 65A to 65D are all rlJ, that is, when rationality is established for all of the power transmission lines 13A to 13D, the output is "l"),
The processing circuit 69 performs processing when the device is normal.

On the other hand, or r-) 68 is AND gate 66A to 66D
When any of the outputs is “l”, that is, the transmission line 13A
130, when rationality does not hold, the output rlJ
In addition, the processing circuit 610 performs device failure processing, such as warnings, displaying, and locking the output of stabilization calculations.

FIG. 7 is a configuration diagram illustrating yet another embodiment of the monitoring function. In this embodiment, the monitoring function is based on the rationality that the power value obtained from the voltage and current information is equal to the output of the power converter. Demonstrates monitoring functionality.

In FIG. 7, 71A to 71D, 72A to 72D, and 73A to 73D represent power values of each power transmission line 13A to 130 input to the memory circuit 33.

They are voltage value and current value. Power value calculation circuits 74A to 74D
is a circuit that calculates the power value P4*Pj*P('*PD) of each power transmission line based on each voltage value and current value described above.The calculation judgment circuits 75A to 75D calculate the power value P4*Pj*P('*PD) based on the voltage and current. The calculated power value and each output P from the power converter
This is a circuit that determines that A v Pge Pc* PD is equal, and determines that P'-δ(P(P+δ).

Here, δ is the error of the device. When the above judgment is established, the output of the calculation judgment circuits 75A to 75D becomes "l". ANDff-) 76 is an output "1" when all the outputs of the calculation judgment circuits 75A to 75D are rlJ, that is, when rationality is established for all of the power transmission lines 13A to 130.
The processing circuit 77 performs processing when the device is normal. Further, when the above judgment is not established, the output of the calculation judgment circuits 75A to 75D is r
At OJ, the output of the Arndgut 76 becomes rOJ, and then passes through the inverter circuit 78 to the processing circuit 79 to perform device failure processing 13, such as displaying an alarm 1, or locking the output of the stabilization calculation.

It should be noted that the monitoring function is not limited to the above-mentioned embodiment, and it is clear that it may be any function as long as it is based on the rationality of electric circuits.

〔Effect of the invention〕

As explained above, according to the present invention, failures in the equipment consisting of the central processing unit installed in the control center, each terminal device installed in each controlled station, and the transmission system connecting these can be corrected based on the rationality of the system and system. Since monitoring is carried out based on the system, it is possible to perform wide-ranging and highly accurate monitoring of the grid stabilization system as a whole), and a highly reliable grid stabilization device can be provided without changing the hardware scale.

[Brief explanation of drawings]

Fig. 1 is a block diagram of an embodiment of the grid stabilization device according to the present invention, Fig. 2 is a block diagram of a terminal device, Fig. 3 is a block diagram of a central processing unit, and Fig. 4 is an addition to the grid stabilization calculation. Fig. 5 is a flowchart showing the processing contents of Fig. 4; Fig. 6 is a block diagram explaining another embodiment of the monitoring function; Fig. 7 is a flowchart showing the processing contents of Fig. 4; FIG. 8 is a block diagram illustrating an embodiment of the present invention, and FIG. 8 is a block diagram of a conventional system stabilizing device. 11... Bus bar, 12AN12D... Generator, 13A-13F... Transmission line, 14A-14F... Current transformer, 15A-15F... Instrument transformer, 16A-16J... Shutoff vessel. 17A-17D...Transformer, 21A-21F...Input converter. 22.22A, 22B...Power converter, 23A-23
! ...Filter, 24A~24! ...sample hold circuit, 25...
・Multiplexer, 26... φ converter, 27... P/S converter, 31
A to 31D...φ converter, 32... Direct memory access circuit, 33.
...Memory circuit, 34...CPU. 35.-ROM, 36... Output circuit.

Claims (4)

[Claims] (1) Multiple terminal devices installed at various locations in the power system that introduce local system information of the power system, and perform processing necessary for stabilizing the power system using each information from the local power system and the terminal devices. In the system stabilization device, the central processing unit is equipped with a central processing unit that transmits information about the local processing unit, and a plurality of transmission systems that connect each terminal device other than the central processing unit and the central processing unit to transmit information. A system stabilizing device characterized in that it performs monitoring based on the rationality of the system using information from each terminal device. (2) The system stabilizing device according to claim 1, wherein the rationality of the system is determined based on whether the difference between the input amount of electricity and the output amount of electricity is within a predetermined error. (3) The rationality of the system is that the generator is outputting power,
2. The system stabilizing device according to claim 1, wherein the determination is made based on whether each breaker of a power transmission line connected to the generator is in an "on" state. (4) The rationality of the system is determined based on whether the difference between the output power of the generator and the result measured via the converter is within a predetermined error. Grid stabilizer.