SU1697182A1 - Method of automatic control over transfer of power - Google Patents

Abstract

The invention relates to electrical engineering and can be used to automatically regulate the power flow in an energy mix. The purpose of the invention is to increase the reliability and efficiency of the energy system. To generate the increment value of the task for developing the capacity of the regulating power station, a step change in the power plant capacity associated with an unbalance in the power system is measured. The step change in the power of one power plant determines its total value for the power plants of the Eneogarayon. After the ampoule and value of the materiality, the increment value of the reference of the regulating power plants is generated, which is taken into account in the power unit from the displacement of the flow detector operating as a function of the anticipated diversion of the flow of 1 XR

Description

The invention relates to electrical engineering and can be used to automatically regulate power flows in a power connection.

The purpose of the invention is to increase the reliability and efficiency of the power system.

The drawing shows a diagram of the device that implements the proposed method.

The device contains an organ 1 measuring the adjustable parameter (RP) from a predetermined value, element 2 forming a prevented RP deviation (power flow), adder 3, unit 4 forming the inverse transient function of the corresponding XPS, sensor 5 of the actual power of the corresponding XPS, regulating system 6 the active power of the corresponding REG, e ch.d 7 of algebraic summing – g - g ochstv / yuyushchy RES. amplifier передачи with the transfer efficiency, different ratio / effect of power change of the corresponding RES on power, cable 9 transmission mold-4ly, start circuit 10, counter 11 remaining adjustment time, switch 1 / RES channels, chopper

13 channels of the corresponding RES silica

14 with a gain factor inversely proportional to the state of the change in power of the corresponding RES, tja power flow, remove the limiter 15 according to the needs of the power station, block 16, the limit of the corresponding XPS. 17 adherence-of-a-power station memory memorizer, limit 18 temps to power XJ

m ™ s

sh

HES, control unit 19, adjustment time, multiplier 20 of the corresponding RES, setter 21 of the permissible rate of change of the task of the corresponding RES, delay sensor 22 of the delay time in the information transmission channel and controller of the corresponding RES, setpoint 23 of the maximum and minimum allowable power of the corresponding RES, circuit 24 control of the corresponding RES, interrupter 25 of the channel of the corresponding RES, sensor 26 of the malfunction of the controller of the corresponding RES, block 27 for fixing a step change in power is appropriate RES, block 28 multiplied by a factor equal to the ratio of the total step change in power of the power stations of the power district to the step change in power of this RES, adder 29, element 30 comparing the signs of signals, valve 31, sensor 32, time adjustment of the generator of unplanned power (computer) RES, multiplier 33 The computer of the corresponding RES, unit 34 of the allowable rate of change of the computer task of the corresponding RES, unit 35 of the maximum and minimum allowable power of the computer of the corresponding RES, computer control circuit 36 corresponds RES guide controlled by the computer 37 corresponding limiter RES, 38 limiting the computer unit corresponding RES, an adder 39 corresponding to the storage RES, limiter 40 appropriate computer RES, the dial 41 of the time lag regulating - (ora power corresponding RES.

The automatic control system works as follows.

When a deviation of the parameter (power flow) from a predetermined value occurs, the circuit 10 generates a signal that is removed when the flow deviation is equal to the bullet. Switch 12 produces alternate circuit-opening of all circuits from the valve 31 to the circuit breakers 13 of the channel for the formation of the increment of the task of all RES.

When a signal from the circuit 11 arrives at the input of the counter 11, a stepwise decrease in the signal amplitude of the magnitude of the regulation time Treg begins. coming to his second entrance. In the absence of a signal from the circuit 10, the counter will have a signal value proportional to the time Treg. Switch 12 sequentially closes the circuits from element 2 to the input of amplifiers 14 in succession. Amplifier 14 produces an increase in the input signal to a value that will correspond to the power turnaround 1

A res to completely suppress flow diversion. Controlled limiter 16 limits the amplitude of the input signal to the value given by the squash 20, which is determined by the expression

Ј | Vi (Tper - tci - t3i)

(one)

where V) is the permissible rate of change for the task of the 1st RES;

tci is the adjustment time adjustment. introduced by the counter 11;

tai is the lag time in the information transmission channel and power controller of the 1st RES.

The parameters Tper, tai and V, are respectively set by setters 19, 22 and 21.

Block 16 enforces a constraint.

of the input signal in terms of the adjustment range corresponding to the RES to increase and decrease the power in accordance with the specified maximum and minimum values of the power of the RES.

The magnitude of these ranges is determined by the sensor 23.

The memory adder 17 performs the summation of the current value of the specified power of the i-th RES with increment

tasks coming from the output of block 16.

Limiter 18 provides a gradual increase in the setting of the i-th RES in accordance with the values of the increment of the task and the allowable rate of change.

power Vj of this RES.

Scheme 24, when an input signal proportional to the magnitude of the increment of the task, sets at its output a constant amplitude signal on

time, defined as the quotient of dividing the signal from the output of block 16 (job increments) by the setpoint 21 signal (the rate of change of the job of the 1st RES is permissible). After the specified time has passed, the signal from the output of circuit 24 is removed. The chopper 13 is controlled by the signal of the circuit 24. With this signal present, the contact of the chopper 13 is opened.

Breaker 25 opens the circuit between

the output of the corresponding block 4 and the input of the adder 3 in the presence of a signal from the sensor 26 and a malfunction of the power regulator or the control channel of the RES. When an unbalance of active power arises in the power system, for example, a deficit, each RES and intersystem transmissions perceive their share of a stepwise change in power caused by this unbalance. Fixation block 27

measures the magnitude of the stepped increment of power and remembers its value. The operation of this unit should be rebuilt from random power changes that do not require emergency unbalance compensation. The output of block 27 is fed to the input of block 28 multiplying by a factor Ki, which is determined by the expression

, -Ј

- one

And R / D PI,

(2)

where A PI is the step increment of the power of the 1st RES (I 1, t. t is the number of RES connected to the flow controller);

APj is the stepwise increment of the power of the 1st power station, which is included in the i-th power district (the number of power regions is equal to the number of RESs, t);

I is the number of power stations in the energy district.

The increment value of the task for testing the power of the i-th RES A RZt K; A Pi should fully reflect the magnitude of the total step change in the power of the power plants included in the Engergo area of the i-th RES.

The value of the coefficient KI, defined by (2), characterizes the ratio of stepwise changes in the power of power stations of the power district, which are connected with the node y, taken as the electrical center of the energy district. If the values of the synchronizing powers of these power plants with respect to the center y, then the magnitude of the power increment A Pi can be determined by the expression

.u i Ap / i: pcjy,

where P ci y is the synchronizing power of the i-th RES in relation to the node y (the electric center of the energy district):

P Cj y — synchronizing power — and power-generating power stations (J 1,1) with respect to node y

APj is a step change in the power of the jth power station of the power district.

Thus, the parameter Ki, taking into account expression (2), can be calculated by the formula

 2

i i

Pcjy / PciyThe value of the coefficient K |, defined by (4), characterizes the ratio of stepwise changes in the power of power stations of a power district that have a tight connection to the node y. In complex power district circuits to account for power plants that do not have direct, tight connections to the node y, the value of the coefficient K | according to (4) should be adjusted in the direction of its increase.

So, the signal at the output of block 28 represents the total value of the increment of the power setting of the i-th RES. This increment of the task best corresponds to the natural distribution of the unbalance (deficit) of power between m energy regions. The energy system is determined by the magnitudes of the synchronizing powers of the power regions in relation to the perturbation node.

Through closed circuit breaker contacts

13 computer of the i-th RES the output signal of the unit 28 is fed to the input of the controlled limiter 37 of the computer of this RES, which restricts the input signal to the value determined by the signal of the multiplier 33

I

with | by expression

J

R Vi (Treg - tsani

(five)

30 where taani is the delay time of the power regulator of the i-th RES.

Settings Reg. V and t3am are respectively determined by the controllers of the computers 32, 34 and 41

35B, in block 38, the increment of the task for testing the power of the 1st RES is limited by the values of the maximum and minimum allowable power of this RES, which are determined by the unit 35.

40C output block 38 sig al increments

a job that satisfies all the constraints is fed to the c-move of the memory adder 39, which performs the summation of the increment of the job with its previous value.

Limiter 40 provides a gradual increase in the setting of the i-th RES in accordance with the values of the increment of the task and the allowable rate of change.

5Q power Vi. Through the adder 29, the output signal of the limiter 40 is fed to the system 6 control active power

. RES.

The circuit 36, when a signal proportional to the increment of the reference (from block 38) appears on the input, sets at its output a constant amplitude signal by the time determined as a quotient from the division of the increment of the reference (block 38 signal) by the allowable rate of change of the reference (signal setting device 34). After a specified time, the signal from the output of circuit 36 is removed. The signal of the circuit 36 is transmitted to the interrupter 13 of the electronic computer of RES, and through channel 9 to the interrupter 13 of the flow regulator related to the control of the same electronic power source.

With significant imbalances of power in the power system, the increments of the task are initially formed at the EF upon the disturbance (imbalance of power). The process of determining the increment of tasks on the RES is ahead of this process at the level of the regulator of the overflow, since the deviation of the overflow is a consequence of the unbalance that has arisen and appears only after a certain period of time has passed. In this case, the signals of the RES circuits 36 block, through the corresponding interrupters 13, channels for forming the increment of the task of these RESs of the level of the flow regulator.

With insignificant stepwise imbalances or slow changes in the power of the power system consumed in the power system, the increments of the tasks are formed in the flow controller and transferred to the corresponding XPS.

Through the channel 9 for transmitting information, the increment signal of the task from the adder 39 of the RES is transmitted to the first input of the element 7 of algebraic summation. The second input of element 7 receives a signal from the adder 17 of the flow regulator; its third input receives a signal from the actual power sensor 5 with a minus sign. The output signal of the element 7 is obtained equal to the total value of the current setting of the flow regulator and the increment of the reference obtained at the adder 39 of the corresponding RES, minus the actual power of this RES. The output signal of the element 7 is multiplied in the amplifier 8 by the coefficient of the effect of the power change of the corresponding XPS on the power flow. Through the interrupter 25, the output signal of block 4 is fed to an adder 3, which sums the signals of all blocks 4 related to the corresponding RES. Purpose of the breaker 25 is the opening of the channel at a non-zero signal from the sensor 26 of the malfunction of the controller of the corresponding RES or channel 9 of information transfer. The signal from the sensor 26, the interrupter 25 breaks the output circuit of the unit 4 of the corresponding RES.

The signal of the adder 3 with the opposite sign is fed to the input of the element 2 of the formation of the anticipated deflection of the flow, where it is algebraically summed with the flow deflection signal. A comparison is then made between the signs of the signals.

flow deflection and anticipated flow deflection carried out by reference element 30. When the signs match, an authorization signal is given to the valve.

31, which connects the output of element 2 to the input of switch 12.

The need to check the signs of signals is explained by the fact that when an imbalance (shortage) of power occurs

0 outputs of the adders 39 of the COMPUTER RES form the increment signals of the task, which are transmitted to the corresponding inputs of the blocks 4 through channels 9. In this case, the adder 3 produces the addition of the output signals

5 blocks 4. After changing the sign to the inverse, the signal of the adder 3 is fed to the element 2 (with a power deficit, the sign of the signal is negative). For the initial moment of time after the occurrence of the steppe perturbation, the deviation of the overflow associated with this perturbation is insignificant and the resulting signal at the output of element 2 will be negative. The signal of organ 1 is positive, therefore

5, the comparison element 30 generates a inhibit signal and the valve 31 is closed. The number of the job done by the computer RES, the signal of the adder 3 will decrease. With inaccurate setting of power at

0 RES computer (power shortage, for example, exceeds the reference) the signal of element 2 after some time becomes positive and the flow regulator comes into operation.

5 In case of failure of the power controller of any RES, sensor 26 of this RES transmits a signal to breaker 25, which breaks the channel from unit 4 of this RES. In so doing, the signal changes abruptly.

0 at the output of element 2 and through the switch 12 will be changed to set the required number of RES. Using the interrupter 13 eliminates the possibility of forming an increment of the task of the RES, in which

5 faulty power regulator or channel 9.

So, with significant power imbalances in the power system, electronic RES devices initially act, forming an increment of task by the magnitude of perturbations, and at the final stage of the process (with an inaccurate task or for other reasons) the flow regulator enters into operation. In the case of smooth processes of changing the power consumption of my power in the power system, only the flow regulator functions.

The implementation of the proposed method allows to increase the speed of the flow control system by generating an increment of assignment of individual RES based on the use of local information on the magnitude of the disturbance. This leads to significantly smaller deviations of the flow, which increases the use of transmission capacity by increasing its permissible load and, therefore, the efficiency of the power system.

Claims (1)

Invention Formula The method of automatic control of power flows in the power system, according to which the power flow through the power line is measured, the power value of each control power plant is measured, the control effect on the power change of control power plants is formed, the difference between the current control power value is determined for each power plant and the power value of the regulating power plant, the resulting difference is multiplied by the coefficient of influence of the change in power co - sponding power on the power flow, summing the resulting product was determined power flow deviation from the predetermined value, alter the flow deflection by a sum obtained pieces taken by a negative sign, and said control action to change five 0 5 0 5 0 The power of the regulating power plants is formed as a function of the modified deflection flow, characterized in that, in order to improve the reliability and efficiency of the power system, a stepwise increment of its power is fixed at each control power plant, caused by an imbalance of the power of the power system, by a factor equal to the ratio of the total power increment power plants of the power district to a stepwise increment of the power of this power plant, and form a controlling impact The change in power of each regulating power plant by the amount of the resulting product, and the resulting value of the control action should not exceed the value allowed by the power plant technology, at the same time the control effect on the change in power of the control power plants, generated as a function of the changed deflection of the power flow, is changed by the same amount , then the sign of the deviation of the overflow is compared with the sign of the altered deviation of the overflow and, if the signs do not match, the control effect on the change in power of regulatory power plants, the formation of the function of the modified deflection flow.