SU1103325A1 - Centrilized device for adjusting voltage and reactive power of power system - Google Patents

Abstract

A CENTRALIZED DEVICE FOR CONTROLLING VOLTAGE AND REACTIVE POWER OF THE ENERGY SYSTEM, containing a block for calculating the optimal voltage in the support node, to the output of which a threshold element and an output unit are connected to the voltage output unit, the second input of the first comparison unit is connected to the voltage sensor, to the input of the chloge block, and the output unit, the second input of the first comparison unit is connected to the voltage sensor, to the input of the chloge block and the output unit, the second input of the first comparison unit is connected to the voltage sensor, to the input of the chord block and the output unit, the second input of the first comparison unit power sensors connected to the consumption of reactive power sensors reactive power generating sources alarm blocks on the input restrictions, the element is not the first expander of pulses is connected to the output unit, the distribution unit, the outputs of which through serially connected comparison units, threshold elements, the first and second elements I are connected with the output units of the device, the second expander of pulses whose output is connected to the second element NOT, the output which is connected to the second inputs of the first and second elements I, the outputs of the reactive power sensor of the generating source and the block C are connected to the second inputs of the second and third comparison units The third element is connected to the input of the distribution unit, an OR element, characterized in that, in order to accelerate the control and simplification process, it is equipped with a voltage deviation fixation unit, a change fixation unit (L nor the total reactive power of the subsystem and calculating the required change in reactive power, and the blocks for fixing the voltage deviation and the change in the total reactive power are connected to the input of the block for calculating the required change in reactive power, to the third The first input of which is connected to the output of the first comparison block, the output of the specified calculation unit is connected to the third element N3 of SL And, to the second input of which the first pulse expander is connected, the output of the first element is NOT connected to the unit of reactive power calculation, the outputs of the output blocks of the device through the OR element connected to the second pulse expander.

Description

The invention relates to devices for controlling the voltage of the reactive power of a power system,

A centralized arrangement is known; a facility for controlling the voltage regime and the reactive power; a unit for comparing the actual voltage of the reference node with a predetermined, threshold elements and you; one unit, a distribution unit, reactive power sensors of generating sources {,

One of the drawbacks of this adjustment is that the voltage of the reference node is set in the form of a time program task,

and the equity participation of generating sources is predetermined, the problem is solved without real-time optimization.

This prevents the use of weight; economic benefits of centralized management.

Another disadvantage of this system is that the distribution unit - provides power plants with power settings, and at power stations, reactive power controllers are used as a secondary regulator. In the event of the least reliable centralized part of the control system, the TV channel or the power system separation, the reactive power regulator should be taken out of order in emergency order, and the voltage regulation continues only with the help of ARBs, whose accuracy in part the voltage is insufficient. The closest to the pre-store is a centralized device for controlling voltage and response: due to the power of the power grid. It contains an optimum calculation unit. voltage in the reference node, to the output of which, in series with the comparison unit, the threshold element and output unit are connected, the second input of the first comparison unit is connected to the input terminal

calculation of reactive mosquito connected sensors of power consumption, recovery power, sensors of the generator of the device, which were connected to the device. .if ds1va1-celno soy / aided blocks, compare:: .I., ioric ijic seiiTbi, the first and the elements of H are connected with the output-iH units of the device; the second pulse extensions, the output of which is soy; 1nier} with the second element NOT, the output of which is connected to the third inputs of the second and second elements AND, the second output unit, the second and third comparison units are connected to the outputs of the signaling unit -A about imposing restrictions. the third element AND is co-ordinated with the input of the distribution unit, z.pement OR 21.

one.

In the known device, in order to optimize the regime at a real-time pace, models for calculating the optimal voltage of the reference node and the most advantageous fraction of generating sources in its regulation are provided. Taking into account that the power station's power settings given by peaKTiiBHbie can only be determined with a mink low in the reference node, the deviation of this voltage is eliminated by increasing the reagent reference: the power reached by the integrator 2 on the output of the reactive power calculator ocTHj output which: the initial values of the mie are received by the integrator, which is triggered by a sign of the occurrence of a voltage deviation in the reference node: the reactive power adano is proportional to Aonach, full set-point for reactive power and retrofitting are done. with equity participation defined in the predlo1T – th control cycle. In order to avoid unsustainability of the control process, the rate of change of the setpoint must be consistent with the speed of control.

The disadvantage of such a change in the setpoint is the setpoint and, in terms of reactive power, there is an additional decrease in speed: At the same time, the program execution of the i-iHTerpaTopa block is 1–1, which is only 1-1, which is equal to:

The gzhel of the invention is the acceleration of the control process and the control,

Delivered n, gl is achieved by that. what is a dental device, a chizovannaya device for controlling the current supply and the reactive power of the power system,

The optimal voltage calculation unit in the reference node, to the output of which the threshold element and the output unit are connected in series with the comparison unit, the second input of the first comparison unit is connected to the voltage sensor, the reactive power consumption sensors and the reactive power sensors are connected to the input of the reactive power calculation unit. generating sources, restriction input signaling units, NO NOT, whose input through the first pulse expander is connected to the output unit, the distribution unit, the outputs to second, through the successively connected comparison units, the threshold elements, the first and second elements AND are connected to the output blocks of the device, the second pulse expander, the output of which is connected to the second element NOT, the output of which is connected to the second inputs of the first and second elements AND, to the second inputs of the second and the third comparison unit is connected to the outputs of the reactive power sensor of the generating source and the alarm input unit, the third AND element is connected to the input of the distribution unit, the OR element, The voltage deviation fixing block, the fixation block of the change in the total reactive power of the subsystem and the block calculating the required change in reactive power, the voltage deviation fixing blocks and the change in the total reactive power connected to the input block for calculating the desired reactive power, the third input of which is connected to the output of the first the comparison unit, the output of the specified calculation unit is connected to the third AND element, to the second input of which the first pulse expander is connected The output of the first element is NOT connected to the reactive power calculation unit, the outputs of the device’s output units are connected via the OR element to the second pulse expander.

The drawing shows a block diagram of a centralized device for controlling voltage and reactor power.

The diagram contains the -full mathematical model 1 of the electrical system, by which the

33254

constants used in the collapsed model; a memory block 2 in which the constants used to calculate the voltage are fixed;

an optimum voltage calculation unit 3 at the reference node; an electric network mode information block 4 necessary for determining the optimum voltage at the reference node; voltage sensor 5, comparison unit 6; threshold elements 7; output block 8; pulse expander 9; logical element And 10; voltage deviation fixer during the previous control cycle 11; a fixation unit 12 for a change in total reactive power during the previous control cycle; unit for calculating the required change in reactive

0 power 13; logical element NOT 14; a memory unit 15 in which constants are stored that are necessary for determining the fractional share of power plants in the regulation; consumption sensor

5 reactive power 16, sensor 17 reactive power of power plants; restriction input signaling units 18; block 19 for calculating the optimal reactive power of power plants; distribution unit 20; Comparison unit 21 is actual and specified. reactive power; threshold elements 22; logical elements And 23; output blocks 24 devices; logs, cic element OR 25; the expander 26 of the pulse signal; logical element NOT 27.

Block 1, conditionally shown in the diagram, is a large computer,

0 with the help of which, by a known algorithm, the constants 21 are determined. Block 2 is a memory in which the constants included in the control used for

5 calculate the optimum voltage. Block 3 is a functional converter that calculates the voltage based on the information on power flow along transmission lines adjacent 1M to the reference node, on the number of units working in the mode of synchronous compensators, consuming active power rotation and weather data describing crown loss.

Block 4 characterizes a complex of gauges with the help of which initial information is entered into block 3. is required to calculate the voltage (power flow9 number of j aggregates operating in sync compensation mode and TA). Block 13 is a procedure that calculates the required increment of reactive power on the basis of the deviations that were fixed in the foregoing control circuit, the compensation of which required a change in the power and information on the current deviation of the voltage to the formula constants of the relation & Q / UU in two successive control cycles. Block 15 represents the memory in which the coefficients B of the equations of relative gains of losses are stored. Block 16 represents the total reactive power meter of the generating source subsystem. Block 19 is a processor that solves a system of linear equations for relative gains of losses relative to the reactive power of the generating sources. At the outputs of this block, the numerical setpoints of the generator of the source of reactive power are generated. Block 20 is a processor with which the required reactive power increment, determined with the help of block 13, is distributed by the generating sources in proportion to block 19. The operation of the device is carried out as follows. Previously, on the mainframe 1, the constants are calculated, used to calculate the optimal voltage and the distribution of reactive power. The first ones are stored in memory block 2, and the second ones in memory block 15. Based on the variables received from information meters 1, the unit 4, the optimal voltage is calculated using this formula in the functional converter the reference node, which goes to the first input of the comparison unit 5, to the second input of which the actual voltage from the meter comes in. When the actual voltage deviates from the unit specified at the output b, a signal appears that is equal to their difference 5 ; -; and the computing unit 13 on the insensitivity block specified by the threshold / 5 which then passes blocks 8 and 9., access to blocks 13 and 10, in CTaTHKiG the voltage is optimal to the output of block 6 there is no signal, In this case: ae no signal at the output of threshold element 7 and at the output of blocks 8 and 9 At the output of the block HE 14 there is a signal that starts the block of distribution enr 20, calculates a judging based on the source data from blocks 165 17 and 18, the optimal reactive power of the generating sources. At the output of block 13 of the HBTj MS signal, therefore, there is no signal at, the output of block AND 10. This prohibits the operation of block 20, which does not cause assignments to generating sources for reactive power. When the voltage in the reference node is rejected, the signal at the output of block 14 disappears and the signal at the output of block 10 appears. In this case, 5jjoKa 19 stops working, by which it is impossible to calculate the optimal distribution of reactive power when the voltage deviates due to load dependence on voltage. Block 20 is started to eliminate the deviation that has occurred. When the reactive power is changed by a generous thin source, this is revealed in comparison blocks 21, 1 of which it is compared with the actual reactive mopdality from l;; at 17. When the error exceeds the threshold given by block 22 ,; sig1-: al enters kana-. Remote control at the power station, where the installation of the secondary voltage regulator is changed by one step,. The control signals, via the logic element 11LI 25, enter the block 26, where they are stored for a time, which transmits the control transition. At the same time, the signal appears on the entrance €: the logical element HE 27 and disappears at the second input of the logical element AND 23s, stopping further control until the end of the first control pulse from. The control continues. After inputting the voltage into the dead zone, a monitoring control at the output 71 of the unit 14 appears and in block 19 the reactive power of the generating sources is recalculated, which can be used in the next control cycle. The foregoing control determines whether control speeds and, consequently, increases the economy of the mode, and also simplifies the control process. Thus, as a secondary regulator in a power plant, a central voltage regulator is used. 58 eliminates the inferiority of APBs as a means of maintaining voltage in a normal mode, and this allows using the coordinated settings of the secondary regulators to maintain the required voltage level of the supply network for a long time, which simplifies the device and improves the efficiency of the mode, and the control increments of reactive power increase control speed, which further improves the efficiency of the electrical network mode.

Claims (1)

A CENTRALIZED DEVICE FOR MANAGING VOLTAGE AND REACTIVE POWER OF THE ENERGY SYSTEM, comprising a unit for calculating the optimal voltage in the reference unit, to the output of which a threshold element and an output unit are connected in series with the comparison unit, the second input of the first comparison unit is connected to the voltage sensor, and the input of the reactive power calculation unit is connected reactive power consumption sensors, reactive power sensors of generating sources, signaling units for entering restrictions, element NOT, input of which through the first pulse expander is connected to the output unit, the distribution unit, the outputs of which through series-connected comparison units, threshold elements, the first and second AND elements are connected to the output units of the device, the second pulse expander, the output of which is connected to the second element NOT, the output of which is connected with the second inputs of the first and second elements AND, the outputs of the reactive power sensor of the generating source and the signaling unit are connected to the second inputs of the second and third comparison units water restriction, the third element AND is connected to the input of the distribution unit, the PLI element, characterized in that, in order to speed up the control process and simplify it, it is equipped with a voltage deviation fixation block, a subsystem for detecting changes in the total reactive power of the subsystem, and a unit for calculating the required change in reactive power, moreover, the blocks for fixing voltage deviations and changes in the total reactive power are connected to the input of the unit for calculating the required change in reactive power, to the third input of which The output of the first comparison unit is clear, the output of the specified calculation unit is connected to the third AND element, the first pulse expander is connected to the second input of it, the output of the first element is NOT connected to the reactive power calculation unit, the outputs of the output units of the device through the OR element are connected to the second pulse expander. SU .... 1103325> ί!