JPH07336901A - Frequency controller for power system - Google Patents

Abstract

PURPOSE:To enable smooth frequency control by correcting the operation of the distribution of command values in a frequency control function and an economical load control function when a hydropower generator judges it to be in pumping with a pumping processing function. CONSTITUTION:In addition to a base value setting function 1, an AR operating function 2, a thermal AFC function 4, a thermal EDC function 5, and a hydraulic EDC function 6 provided in a frequency controller(AFC), a pumping processing function 9, which takes in the information to show the operation state of a thermal power generator transmitted through a cyclic digital telemeter CDT from a power system network PWN and corrects the hydropower AFC function 4 and the hydropower EDC function 6, is provided. When the pumping processing function 9 starts up, and it judges the thermal power generator to be in pumping, it corrects the hydropower base value set in the base setting function 1 to the hydropower AFC function 4, and corrects, to the hydropower EDC function 6, the upper and lower limit values used in computation process, etc., or the command value by the amount of hydropower EDC.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power system frequency control device (hereinafter referred to as AFC).

[0002]

2. Description of the Related Art As this kind of AFC, an electronic computer incorporating an AFC program is adopted, and information is exchanged with a power system network so that the system frequency is controlled to maintain a reference frequency.

FIG. 5 shows the relationship between the conventional AFC and each external device and generator. In FIG. 5, CPU is an electronic computer having an AFC program built-in, PWM is an electric power system network, and the electric power system network PWM includes a plurality of hydraulic power generators 71 to 7n and a plurality of thermal power generators 81 to 81.
8n is included.

The computer CPU and the power system network PW
Information is exchanged with M by a transmission device, for example, a cyclic digital telemeter CDT. The relationship between each component is that the actual hydraulic power output Pw, the actual thermal power output Pt, and the frequency deviation Δf are cyclic digital telemeter CDs.
It is taken into the computer CPU through T.

The AFC composed of the above-mentioned electronic computer has a base value setting function 1, an area demand amount (AR) calculation function 2, and a thermal power A.
FC function 3, hydraulic AFC function 4, thermal power economic load distribution control (Economic Dispatching Con)
troll: simply abbreviated as EDC) Function 5 and hydraulic power E
It has a DC function 6.

The AR calculation function 2 calculates the regional demand amount AR from the deviation Δf (hereinafter simply referred to as frequency deviation) between the reference frequency and the system frequency and the total demand Soj. The total demand S
oj is created by another program built in the electronic computer CPU.

Here, the area demand AR is obtained by the following equation. AR = Δf × K × Soj (1) However, K: system constant Further, the hydraulic power AFC function 4 is the hydraulic power base value Bw set by the base value setting function 1, and the regional requirement calculated by the AR calculation function 2. Area demand AR from quantity AR and actual hydraulic power output Pw
Is distributed by the rated capacity ratio.

First, the hydraulic power component with respect to the regional demand AR is obtained by the equation (2). ARW = AR × hydraulic power distribution fraction (2) Next, based on this ARW, the hydraulic power AFC component command value is calculated by the equation (3).

Poa (i) = (KI × II + KP × ARW + KD) × W (i) ÷ EE (3) where i: hydroelectric generator no. (1, 2, 3,
... n) poa (i): hydraulic power AFC minute command value KI: integral gain II: AR integral compensation KP: proportional gain KD: differential gain, W (i): rated capacity EE: total rated capacity Further, according to the equation (4). Hydraulic power base value Bw and actual hydraulic power output P
Hydropower EDC by redistributing the total difference from w (i) at the distribution rate
Calculate the minute command value.

Poe (i) = BW (i) + {Σ (Pw (i) −Bw (i)) + ARW} × X (i) ÷ FF (4) where poe (i): hydraulic EDC component Command value Bw (i): Hydraulic power base value Pw (i): Actual hydraulic power output X (i): Distribution rate FF: Total distribution rate Further, the hydraulic power EDC function 6 is a hydraulic power AFC component command obtained by the hydraulic power AFC function 4. Based on the value poa (i) and the hydraulic power EDC command value poe (i), the hydraulic power command value is obtained by the equation (5).

Pow (i) = poa (i) + poe (i) (5) pow (i): hydraulic power command value On the other hand, the thermal power AFC function 3 has a thermal power base value Bt set by the base value setting function 1, The thermal power transfer amount of the AR is distributed from the regional required amount AR and the actual thermal power output Pt obtained by the AR calculation function 2 at the thermal power change speed ratio.

This distribution is calculated by the following equations (6) to (7).
Calculated by the formula. ART = AR × thermal power distribution ratio (6) Pot (j) = Pth (j) + ART × TH (j) / HH (7) where j: thermal power generator no. 8 (1, 2,
3, ... m) Pot (j): Thermal power command value Pth (j): Smoothed value of actual thermal output TH (j): Velocity of change HH: Total velocity of change The thermal EDC function 5 is the economy of thermal EDC transfer amount. Set the command value by load distribution.

The thermal power EDC transfer amount is calculated by the following equation (8). AP = Σ (Pth (j) −Bt (j)) + Psk (8) where AP: thermal power EDC transfer amount Bt (j): thermal power base value Psk: preceding control amount The above is an example of AFC control by the conventional method. Is.

[0014]

However, in such a conventional control method by AFC, a low demand time zone (midnight)
In many cases, the hydroelectric generator is stopped or pumped, so the frequency control target of the hydroelectric generator is small, and a smooth frequency control result cannot be obtained.

Further, there is a problem in that the control result cannot be evaluated later because no data relating to the control signal remains. The present invention has been made to solve the above-mentioned problems, and the first purpose thereof is the conventional AF.
The pumping treatment function is added to the C function and the hydraulic power EDC function to enable control to the generator during pumping, and the second purpose is to save the control result and analyze and verify it later. It is to provide a frequency control device for a system.

[0016]

In order to achieve the above object, the present invention comprises a frequency control device for a power system by the following means. The invention corresponding to claim 1 transmits / receives information to / from an electric power system that supplies electric power to a load in each region from a plurality of generator groups of different types including a hydroelectric generator, and a deviation between a reference frequency and a system frequency. The regional demand is calculated from the total demand and the total demand, and the frequency control function for each type of generator distributes the frequency command value of each generator from the regional demand and the actual output of each generator, and the economic load control function. In a frequency control device that controls so that the frequency of the power system is maintained at the reference frequency by distributing the economic load,
The operating state of the hydropower generator that is transferred from and to the power system is taken in to determine whether the hydropower generator is in pumping, and if it is pumping, the frequency control function and the economic load control function are corrected. A pumping treatment function is provided to perform treatment, and command values can be calculated and controlled even for hydropower generators in pumped water.

According to a second aspect of the present invention, a reference frequency and a grid are exchanged by exchanging information with a power system that supplies power to a load in each region from a plurality of different types of generator groups including a hydroelectric generator. The regional demand is obtained from the deviation of the frequency and the total demand, and the frequency control function for each type of generator distributes the frequency command value of each generator from the regional demand and the actual output of each generator, as well as the economic load. In the frequency control device that controls the economic load distribution by the control function so that the frequency of the power system is maintained at the reference frequency, the calculation results of the frequency control function and the economic load control function provided for each type of the generator are shown. A storage processing unit is provided for processing and storing each time section.

The invention corresponding to claim 3 is such that information is exchanged with a power system that supplies power to a load in each region from a plurality of different types of generator groups including a hydropower generator, and a reference frequency and a system are provided. The regional demand is obtained from the deviation of the frequency and the total demand, and the frequency control function for each type of generator distributes the frequency command value of each generator from the regional demand and the actual output of each generator, as well as the economic load. In a frequency control device for controlling so that the frequency of an electric power system is maintained at a reference frequency by distributing an economic load by a control function, the operating condition of the hydraulic power generator exchanged from the electric power system is taken in and the hydraulic power generator is taken into consideration. Is a pumping water, and if it is pumping water, a pumping processing function for correcting the frequency control function and the economic load control function is provided, and a frequency control provided for each type of the generator. Function and the operation result of economic load control functions are those having a storage processing unit that stores and processes per time section.

[0019]

In the frequency control device of the invention according to the above-mentioned claim 1, when it is determined by the pumping treatment function that the hydroelectric generator is pumping, the command values for the frequency control function and the economic load control function are set. Since the correction process is performed for the distribution calculation, it is possible to control the pumped-storage power generator and perform smooth frequency control.

In the frequency controller of the invention according to claim 2, the storage processing unit processes the calculation results of the frequency control function and the economic load control function provided for each type of generator for each time section. Since the stored data is stored after being stored, it is possible to easily adjust the characteristics and constants that are different depending on the type of the generator by taking out the stored data for analysis and verification later.

In the frequency control device of the invention according to claim 3, since the calculation result including the pumped-storage power generator is stored in the storage processing section, more detailed analysis and verification from the stored data. It becomes possible to do.

[0022]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a block diagram showing a first embodiment of a frequency control device for an electric power system according to the present invention. The same parts as those in FIG. 5 are designated by the same reference numerals, and the description thereof will be omitted. Here, different parts will be described.

In the first embodiment, as shown in FIG.
Base value setting function 1 provided in C, AR calculation function 2,
In addition to the thermal power AFC function 3, the hydraulic power AFC function 4, the thermal power EDC function 5 and the hydraulic power EDC function 6, the power system network PWN
A configuration is provided in which a pumping processing function 9 is provided that takes in information indicating the operating state of the hydraulic power generator that is transmitted via the cyclic digital telemeter CDT and performs correction processing on the hydraulic power AFC function 4 and the hydraulic power EDC function 6. It was done.

The pumping treatment function 9 is a hydraulic AFC function 4
In contrast, the hydraulic power base value Bw set by the base value setting function 1 is corrected, and the hydraulic EDC function 6 corrects the upper and lower limit values and the hydraulic EDC command value used in the calculation process.

Next, the operation of the frequency control device for the electric power system configured as described above will be described with reference to the flow chart of the pumping process function 9 shown in FIG. Now, the power grid P
Information indicating the operating states of the WN hydroelectric generators 71 to 7n is transmitted to the AFC via the cyclic digital telemeter CDT.
The pumped-up water treatment function 9 is activated.

When the pumping processing function 9 is activated, the pumping determination section 22 pumps the pumped water while the pumping determination section 22 repeats the processing for all the hydroelectric generators by the hydropower generator repeating section 21 as shown in FIG. Or not.

If the pumping judgment unit 22 judges that the hydroelectric generator is pumping water, the pumping base code setting unit 23
The sign of the hydraulic base value Bf (i) used in the calculation of the hydraulic AFC function 4 is inverted to set Bf (i) =-1.

For the hydraulic power EDC function 6, the hydraulic power upper / lower limit value setting unit 24 during pumping exchanges the hydraulic power upper / lower limit values. Pmaxa (i) =-Pmin (i) Pmina (i) =-Pmax (i) Further, the pumping time control amount code setting unit 25 inverts the sign of the control amount.

Sf (i) =-1 On the other hand, when the pumping determination unit 22 determines that the hydropower generator is not pumped, the power generation base code setting unit 26 uses the hydraulic power used in the calculation of the hydraulic AFC function 4. The sign of the base value is unchanged. Further, also for the hydraulic power EDC function 6, the hydraulic power upper / lower limit value setting unit 27 sets the hydraulic power upper / lower limit value as it is.

Further, the sign of the controlled variable is not changed in the controlled variable setting unit 28 during power generation. The command value is created by replacing the data corrected by the above-mentioned pumping process with each calculation formula calculated by the hydraulic AFC function 4 and the hydraulic EDC function described above. For example, the hydraulic power base value Bw (i) in equation (4) is Bw (i)
When replaced with × Bf (i), the following equation (9) is obtained.

Poe (i) = Bw (i) × Bf (i) + {Σ (Pw (i) −Bw (i) × Bf (i)) + ARW} × X (i) ÷ FF (9) ) The other hydraulic power upper and lower limits and the sign of the control amount are used for checking the upper and lower limits and determining the control direction (up / down) when creating the command value.

Therefore, the pumping process function can be controlled by the hydraulic AFC function and the hydraulic EDC function with respect to the generator in pumped water. According to the first embodiment, with the function of maintaining the frequency of the power system at the reference frequency, it is possible to issue a command to the generator during pumping, and smooth frequency control can be performed even in a low demand time zone. .

In the first embodiment, the case of inverting the sign of the hydraulic power base has been described, but any correction processing method may be used, such as multiplying the coefficient to change the ratio arbitrarily.

Next, a second embodiment of the frequency control device according to the present invention will be described with reference to FIG. 3. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. Here, only different points will be described. Describe.

In the third embodiment, as shown in FIG. 3, command values (each calculated by the thermal power AFC function 3, thermal power EDC function 5, hydraulic power AFC function 4 and hydraulic power EDC function 6 and output to each generator ( The calculation result data) is given to a control result saving function (hereinafter referred to as a save processing unit) 10 and saved in a trace file 11.

As shown in FIG. 4, the storage processing unit 10 includes a trace date / time 41, a total demand 42, a frequency deviation 43, a hydraulic power AR value 44, a thermal power AR value 45, and a hydraulic power actual output 46.
The base value / command value 461 to 46n, the actual thermal power output / base value / command value 471 to 47m, etc. are stored in time series, and the result can be output as a form.

According to the second embodiment described above, the storage processing unit 1
Since the control result is saved in time series with 0, it is possible to easily adjust the characteristics and constants of various generators by extracting the saved control result data later and analyzing and verifying it. .

Although the form output from the storage processing unit 10 does not show the EDC component control command result, the storage processing unit 9 causes the EDC component control command result to be additionally stored. It is possible to analyze and verify the entire generator control state including EDC.

In the second embodiment described above, the case where the data obtained by adding the pumping treatment function 9 is stored is described. However, the conventional AF without the pumping treatment function 9 is provided.
Even if the storage processing unit 10 is provided for C, the control result data can be analyzed and verified.

[0040]

As described above, according to the frequency control device of the electric power system of the present invention, the pumping treatment function is added to the AFC function and the hydraulic power EDC function to control the generator in pumping water. Therefore, smooth frequency control can be performed even in a low demand time period. Further, since the control result is stored in time series, the control result can be analyzed and verified later.

[Brief description of drawings]

FIG. 1 shows a first frequency control device for a power system according to the present invention.
FIG.

FIG. 2 is a view showing a flowchart for explaining the operation of the embodiment.

FIG. 3 is a second frequency control device for a power system according to the present invention.
FIG.

FIG. 4 is an image diagram of control result storage data obtained in the same embodiment.

FIG. 5 is a configuration diagram showing a conventional frequency control device for a power system.

[Explanation of symbols]

CPU: electronic computer, AFC: frequency controller, C
DT ... Cyclic digital telemeter, PWN ...
… Power system network, 1… Base value setting function, 2… AR calculation function, 3… Thermal power AFC function, 4… Hydro power AFC function, 5… Thermal power EDC function, 6… Hydro power EDC function, 9
...... Pumping processing function, 10 ...... Control result storage processing unit, 11
… Race file.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical indication H02P 9/04 E

Claims (3)

[Claims] 1. A standard frequency, a deviation of a system frequency, and a total demand by exchanging information with a power system that supplies electric power to a load in each region from a plurality of generator groups of different types including a hydroelectric generator. Calculate the regional demand from the generator, allocate the frequency command value of each generator from the regional demand and the actual output of each generator by the frequency control function for each type of generator, and distribute the economic load by the economic load control function. In the frequency control device for controlling the frequency of the electric power system to be maintained at the reference frequency, the operation state of the hydraulic power generator that is transmitted and received from the electric power system is taken in to determine whether the hydraulic power generator is in pumping or not. Judgment is made, and if it is pumping, a pumping processing function that corrects the frequency control function and the economic load control function is provided, and it is possible to control by calculating the command value even for the hydroelectric generator in pumping water. That Frequency control device for a power system and symptoms. 2. The deviation between the reference frequency and the system frequency and the total demand by exchanging information with a power system that supplies power to a load in each region from a plurality of generator groups of different types including a hydropower generator. Calculate the regional demand from the generator, allocate the frequency command value of each generator from the regional demand and the actual output of each generator by the frequency control function for each type of generator, and distribute the economic load by the economic load control function. In the frequency control device that controls the frequency of the power system to be maintained at the reference frequency, the calculation results of the frequency control function and the economic load control function provided for each type of the generator are processed for each time section. A frequency control device for an electric power system, comprising a storage processing unit for storing. 3. The deviation between the reference frequency and the grid frequency, and the total demand by exchanging information with a power system that supplies power to a load in each region from a plurality of different types of generator groups including hydroelectric generators. Calculate the regional demand from the generator, and allocate the frequency command value of each generator from the regional demand and the actual output of each generator by the frequency control function for each type of generator, and the economic load distribution by the economic load control function. In the frequency control device for controlling the frequency of the electric power system to be maintained at the reference frequency, the operation state of the hydraulic power generator that is transmitted and received from the electric power system is taken in to determine whether the hydraulic power generator is in pumping or not. A pumping treatment function is provided to make a determination and correct the frequency control function and the economic load control function if pumping is performed, and a frequency control function and an economic load controller provided for each type of the generator. Frequency control device of the electric power system, characterized in that the calculation result with a storage processing unit that stores and processes the time each cross-section at.