JPS60102824A - Frequency controller - 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 frequency control device, particularly a frequency control device (hereinafter referred to as an AFC device) that maintains the frequency of a power system and the power flow of an interconnection line with other power systems to a reference level. ).

[Technical background of the invention]

The AFC device controls the output of the power generator 4fi in the power system so that the required amount of power in the power system is equal to the power supply, and supplies high-quality "% power" with a constant frequency. The purpose of this is to maintain the power flow in the interconnection line with the power grid at the standard value.
A method for maintaining interconnection line 1'1fll 151j at a reference value will be explained using the drawings.

FIG. 1 is a block diagram showing the system configuration when implementing frequency control. In the figure, 1 is an AFC device,
'LL power system information transmitter 3c.

3d...3n and information receiving devices 2c, 2d...2n
Based on this, the total Ojl values of the power system frequency and interconnection line power flow are calculated manually, and each
'jM 'tA's output Jmlt is brought out, and the 8i11 side 1 code corresponding to its control (IIlld) is sent to the information transmitting devices 5a, 5b...5m and the information receiving devices 6a, 6b.
... 6m from shore' [a Iso output adjustment device 7 a r
7 B-7m is sent, and it is sent again '7Lj (A output ig adjustment device 7a, 7b...7m is sent to jill groan t4.
(Then, power generation + A8 a, 8 b-8m was adjusted,
The measured value of the output of the output rv 1 table 8a*8b...8m is input to the AFC device 1 via the information transmitting devices 9a, 9b...9m and the information receiving devices 10a, 10b...10m. It is configured so that In order to do this, it is made to equalize the surplus power supply and the demand for electricity.

FIG. 2 is a detailed block diagram of the AFC device 1 shown in FIG.
It consists of a frequency control calculation section 20, an economic load distribution section 30 (hereinafter referred to as ELD), and a control section 40.

First, the frequency control calculation unit 20 receives the measured value F1 of the frequency of the power system and the measured values PT, ~p'r1 of the power flow of the interconnection line with other power systems, respectively, and then Frequency F and measurement values PTj to PTi of interconnection line power flow are determined by
The control amount ΔP1 of the output of each generator according to the AR is calculated by a method such as calculating the calculated AR and proportionally distributing the calculated AR using the maximum output change rate of each generator in the power system.
~ΔPm is calculated and given to the control unit 40.

In addition, the ELD section 30 contains measured values of the output of each generator (hereinafter referred to as
P+~pm (named as actual output) is input, and the amount of electricity demanded is calculated from the actual output P1~Pm of each generator described above,
The target output value PE of each generator is determined by allocating the demand for electricity to each generator according to the law of economic load distribution in consideration of economic efficiency.
～PF, m are determined, and the target output value PE of each of these generators is determined.
, ~Pg14 to the control unit 40.

On the other hand, the control unit 40 has a receiving device 1 (la, 10
b...Actual outputs P1 to Pm of each starting point from 10 m,
Output control amounts ΔP1 to ΔPm for each generator from the frequency ffi control calculation unit 20 and target outputs fiiPE+ to PEm for each generator from the ELD unit 30 are input. Then, the control unit 40 outputs 1 ! from each input information! Output command values PG, ~PGm to the machine are determined, and each output command value PG
, ~ PGm, information transmission device 5a
, 5b...It is designed to send to 5m.

Here, the total power flow d (value PT, ~PT
i and iL power system frequency measurement (from +rf F,
The method for calculating AR is based on the following equation (1).

AR=Σ(PTo-PT)+IC(Fo-F)-(1
1, Σ(PTo-PT) is the sum of the differences between the reference value and the measured value of the power flow of all interconnection lines, and F is 1i61 of the frequency of the 14 force system pile! The I value, Fo is the reference value of the frequency of the power system, and K is a constant.

Further, the following equation (2) is used to calculate the control amount ΔP of the output of each controlled generator from the AR described above.

However, ΔPj is the output control amount of the j-th controlled generator in the power system, PCj is the maximum output change rate of the j-th controlled generator in the power system tax system, ΣPCji1. The sum of the maximum output change rates of power system-controlled generators in the power system, is .

The ELD section 30 outputs the actual outputs P1 to Pm of each controlled generator.
Calculate the demand MPR for Yosimi force. There are various ways to calculate this, but the following formula is shown with -0 as ◎PRt=C
XPRi, + (1-C) The value of ΣPj is for each controlled power generation 1: & 8 a, 8 b・
...The Goda values of the actual outputs P1 to Pm of 8 m.

The method described above is based on the case where the actual outputs P1 to Pm of the generator and the staining force are estimated and calculated, but any other method may be used.

Then, the electric power demand 1 ftPR calculated in this way is further calculated by the ELD unit 3o, and each control δ1]1 target power generation customer 8a
...Distributed to 8m in consideration of economic efficiency.

Generally, when m generators supply the output demand IPR, it is most economical to determine the output of each generator according to the law of economic load distribution.

The above-mentioned law of economic load distribution refers to the following equations (4) and (5).

PL operator PR is ΣP...(5) However, Fj (the starting cost of the machine for the d jth controlled object starting 'I',
Pj is the output of the j-th controlled generator, λ is a constant (hereinafter referred to as incremental fuel cost), PL is the transmission loss of the power system, and ΣP is the sum of the outputs of all controlled generators. .

FIG. 3 shows the relationship between each output of the a-th, b-th, . . . , m-th generators and the incremental fuel cost. Equations (4) and (5) are expressed as electricity demand 5pR (kipa+Pb shi-+p
m, ), it is economical to set the outputs of the a-th, b-th, . . . , m-th generators to Pa, Pb, . . . Pm. This is because: That is, PH19...Pm may be set as the target outputs PEI to PEm.

Next, let us consider the power demand PR and the generator target output PEj ~
A method for calculating PEm will be explained.

In other words, the power generation cost Fj of the j-th younger brother to be controlled is
For example, by approximating the power generation output Pj as a function of the power generation output Pj as shown in the following equation, the target output pg, ~PErrl can be obtained as η:.

Here, FIG. 4 is a flowchart showing an algorithm for calculating the target output in the distribution section. Fourth
In the figure, step 40 calculates the initial value of the incremental fuel cost. Step 50 is to calculate the target output PEj corresponding to λ, using the following equation.

Further, in step 60, when the target output PIJ deviates from the upper limit output value or the lower limit output value, the target output PEj is corrected to the upper limit 1 shift and the lower limit. Step 70 is to check whether the total ΣPJ of the target output PEj is balanced with the power demand iPR, and ξ is a constant. Here, if the balance is maintained (YES), the process ends. If the balance is not maintained, the process moves to step 80, and the direction of correction for correcting the incremental fuel cost λ is determined so that the total target output ΣPEj and the power demand 11ipR are balanced. That is, if the total target output is less than the electricity demand (ygs), the process moves to step 90a and the correction value Δλ is decreased from the incremental fuel cost λ. Also, if the total target output is smaller than the electricity demand (No)
, move to Stellar 7'90'b and add a correction value Δ to the incremental fuel cost λ.
Add λ. After the correction, the process returns to step 50 and the above operations are repeated. Note that the target outputs PE, ~PEm calculated by the above method are sent to the control section 40.

The approximation as Fj=ajPj2+bjPj+Cj is for the convenience of explanation.Even if a strict approximation formula is used, the target outputs PB1 to PEm can be calculated in the same manner as in the flowchart of FIG. Dog, you can come out.

On the other hand, in the control unit 40, the output control voltage ΔP of each photoelectric machine to be controlled is inputted from the number-based counterfeit control unit 20.
1 to ΔPm, target outputs PJ to PEm of each controlled optoelectronic device inputted from the ELD section 3o, and the receiving device 10a,
The method for calculating the w power command values PG, -PGm from the actual outputs P1 to Pm of the photoelectric machines to be controlled, which are input from lQb...10m, is as follows. That is, first, ELD Miyako 3
The target output PE, ~PE□ input from 0, and the actual output P1~Prrl of the 4-stroke power generation input from the bow OM, the non-water output value PB.
, ~PBm are calculated as in equation (7).

However, P town is the basic output value of the j-th controlled photoelectric machine in the power system, and ΣPBj is the EL of all controlled generators in the power system.
The sum of the target output values from room D 3, ΣPj is the sum of the actual outputs of all controlled generators in the power system, θ is the constant O≦θ<l value, δ is the constant 0 × δ The value of 1 is .

Then, the output control amounts ΔP1 to ΔPm of each controlled generator inputted from the frequency control calculation unit 2o and the basic output values PB, to PBm calculated by equation (7), (8)
Output command value PC of each controlled generator as shown in the formula.

~Determine PGm.

PGj=PBj×ΔPj (j=1~m)...
(8) However, PGj is the output command value of the j-th controlled generator in the power system.

[Problems with background technology]

According to the conventional generator control method described above, after the control signal is sent out, the generator output adjustment device receives the control signal and adjusts the output of the generator to A. That is, it was assumed that the generator responded correctly to the control signal, but the response was not monitored. However, it is quite conceivable that the generator may become unresponsive due to an abnormality in the transmission device, generator output adjustment device, or the like. Even if an f1m control signal is sent to a generator with a poor response, it does not respond, so the amount of power generated by that generator is always erroneous.

[Purpose of the invention]

The present invention has been made to solve the above problems, and it is an object of the present invention to provide a frequency control device that can monitor the response of a generator to a control signal.

[Summary of the invention]

In the present invention, a response monitoring function of a generator is added to the conventional AFC function, and when a generator with poor response is detected, that generator is excluded from the control target and a notification device is sent to the generator. , l This is intended to notify the loss operator.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to the drawings. Fifth
The figure is a diagram showing details of a configuration example of an AFC device according to the present invention. In the figure, the AFC device 1 includes a frequency control calculation section 20, an ELD section 3 room 0 control section 40, a monitoring section 50, an input device 60, and an alarm device 70. In FIG. 5, the 1 monitoring unit 50 contains the actual outputs P1 to Pm1 of the generators, the control unit 40, the output command values PGI to PGrn for each controlled generator, and the input device 60 and the error limit value LMj of each generator. ~LMm and monitoring period MCT
are input, and based on these input values, the monitoring section 50 monitors the response of the generator, and if a poor response is detected, the data is passed to the X reporting device 70. The alarm device 70 is the monitoring unit 50)
Generates good news according to the passed data and informs the damaged personnel that a generator response failure has been detected.

The above fl FIG. 5 is similar to FIG. 2.

Next, the operation of the AFC device 1 shown in FIG. 5 will be explained in detail. Frequency control section 20, ELD section 3 rooms 0 control section 4
0 is the same method as before, and each controlled object emits 1! Shin's output command value PG, ~PGm 'II'' is output.Each control unit 1 target power generation (Ring's output command value PG, ~PGm
PGm is the information transmitting device 115a as in the past.

5b...tl is sent to 5m or passed to the monitoring section 50. The monitoring unit 50 further includes receiving units 10a, 10'.
b...10m, the actual outputs P1 to Pm1 of each generator are inputted from the human power device d60, the limit values LM, to LMm and the monitoring cycle MCT for errors in the output of the generator are input.

The monitoring unit 50 uses these inputs to monitor the response of the generator.
The flowchart in FIG. 6 is followed by tIL.

FIG. 6 is a flowchart showing an algorithm for monitoring the response of the generator in the monitoring section 50. ! !
fT, In Figure 5, step "100 is the next AF
This is a step of delaying process N until execution of C control. Step 110 includes steps 120 and 130 for all generators.
, 140. Step 1
10, GΔIAX indicates the total number of generators. Stella f 12 (l is a step for determining whether the corresponding generator is a control target.Here, if the generator dL is an open side 1 target generator (ygs), step 13C
1, if it is not the controlled object (No) step 14
Move to 0. In step 130, the difference between the previous output command value pGt, t-+ for each controlled generator and the current actual output value "I + i" is added to the output error value ER1, and the output error value ERj is integrated. Step 140 is a step of clearing the output error of each uncontrolled generator to zero. Steps 110 and 120°1
When the process is completed for all generators 30 and 140, the process moves to step 150. Step 150 is a step in which it is determined whether or not the current error check period is reached, using the monitoring period MCT that is input multiple times from the input device 60. Here, if this is the error check cycle (YES), step 1
If it is not the p1 check cycle (No), the process moves to step 100. Step 160 is a step in which Stella f170°180, 190, 200, 210 is executed for all generators. Step 170 is a step of determining whether or not the generator is to be controlled.

Here, if the generator is a controlled generator (YES
), the process moves to step 180, and if it is not the control target (No
) Go to step 210. Step 180 is a step of comparing the absolute value of the output error ERi of each generator with a limit value LMi for the output error. If the absolute value IER+l of the output error is larger than the limit value LMi, that is, if the generator is considered to be indispensable due to poor response (YES), the process proceeds to step 190.

If the limit value LMj is smaller than the limit value LMj (NO), the process moves to step 210. Stella f190 is a step in which a (ζF report) is generated through the craft information device 70 in response to a response failure of the corresponding generator.
．． There is a step to limit the age (iLII target). Step 210 is a step to zero out the output and error caused by each five launchers.

Step 16 (1, 170, 1
80, 190.

When 200 and 210 are completed, the process returns to step 100 and is delayed until the next execution. As described above, the monitoring unit 50 supervises the response of the generator, and when a generator with poor response is detected, it generates four reports through the V alarm device 70, notifies the operator of the same, and also controls the generator. Can be excluded from control.

〔Effect of the invention〕

As explained above, according to the present invention, the response of the generator is monitored, and when a response failure of the generator is detected, that generator is excluded from the control target, and the response failure of the generator is reported as a g-report. Since it is possible to notify the operator, an extremely reliable AFC device with few errors can be provided.

[Brief explanation of the drawing]

Figure 1 is a block diagram showing the system configuration of frequency control.
Figure 2 is a block diagram showing a conventional AFC device, Figure 3 is a diagram showing the relationship between the output of each generator and incremental fuel cost, Figure 4 is a flowchart for calculating the target output, and Figure 5 is a diagram showing the relationship between the output of each generator and the incremental fuel cost. Block diagram showing one embodiment of the AFC device of the present invention, No. 6
The figure is a flowchart showing an algorithm for monitoring the response of the generator in the monitoring section. 1... AFC device 3c, 3d-3n, 5a, 5b-5rn,
9a, 9b-9m - Information transmitting device 2c*
2d-・2n + 6a+ 6b +・-6m +
10a, 10b=40rn=・Information receiving device 4
... Power system 7a, 7b...7m... Generator adjustment device 8a, 8b
...8m... Generator 20... Frequency control calculation section 30... Economic load distribution section 40... Control section 50...: rj+r celebration section 60...
・Input device 70...14 reporting device (7317) generation 1
Person Patent Attorney Nori Yu Chika (and 1 other person) Figure 3 Figure 4

Claims (1)

[Claims] In the frequency control device M, which is configured to determine an output command value for each controlled generator based on the amount of excess or deficiency between the demand and supply of electric power in the electric power system, The measured values and the power flow of interconnection lines with other power systems are input, and the excess and deficiency between the 'ifL power' groove and the supply is calculated, and the excess and deficiency are calculated for each controlled light r1.1. The frequency control 1 total Eil'tXIS to be distributed and the actual output of the target generation bales for each control system 7ii1 are input to calculate the total power to be supplied, and from this calculated total 4'tonne power, the law of equal incremental fuel cost is applied. Therefore, the target output 1111 of each controlled generator. The economic load distribution unit calculates the Wi cost and supply surplus/deficiency of electricity from the frequency control calculation unit jli: the value distributed to the controlled optoelectronic equipment and each control from the economic load distribution unit. The actual output of the target power generator is determined by the husband and wife, and a control unit that determines the output command value of each controlled generator and outputs a control signal to each controlled generator, and each controlled target. an input device for inputting a limit value and a response monitoring cycle for detecting poor response of the generator; an output command value for each controlled generator from the control section; a limit value and response from the input device; A monitoring unit that receives a monitoring cycle and detects a generator response failure, and a warning device that reports a generator response failure alternately. A frequency control device characterized in that a defective generator is excluded from a control target.