CN108429264B - Output voltage control device of series compensation equipment - Google Patents
Output voltage control device of series compensation equipment Download PDFInfo
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- CN108429264B CN108429264B CN201810261717.XA CN201810261717A CN108429264B CN 108429264 B CN108429264 B CN 108429264B CN 201810261717 A CN201810261717 A CN 201810261717A CN 108429264 B CN108429264 B CN 108429264B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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- Supply And Distribution Of Alternating Current (AREA)
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Abstract
The invention discloses an output voltage control device of series compensation equipment, which aims at the requirement that the output voltage of the series compensation equipment in a power system has a specific voltage operation range, ensures the stable, safe and reliable operation of the series compensation equipment and provides the output voltage control device. The control device inputs the first apparent power instruction and the measured value of the output voltage of the equipment, and outputs a third apparent power instruction as the input of the main controller of the equipment, thereby regulating the output voltage stability of the series compensation equipment. The control device is independent of the main controller, and does not influence the control precision and the control performance of the main controller.
Description
Technical Field
The invention belongs to the field of flexible alternating current transmission, and particularly relates to an output voltage control device of series compensation equipment.
Background
The equipment of the flexible alternating current transmission system FACTS can be divided into series compensation equipment, parallel compensation equipment and comprehensive control equipment. The series compensation equipment and the comprehensive control equipment are connected in series to a power grid at one end, fault current in line fault is severe to equipment examination, and fast bypass equipment such as a thyristor bypass switch, a spark gap and the like is generally configured.
In the series compensation equipment and the comprehensive control equipment, a static synchronous series compensator SSSC, a unified power flow controller UPFC, an inter-line power flow controller IPFC and a convertible static compensator CSC are flexible power transmission equipment capable of improving the power transmission capacity and the regulation and control capacity of a system; and a unified power quality regulator UPQC, which can improve the power quality of the circuit.
At present, the fast bypass devices of the series compensation equipment or the comprehensive control equipment are all thyristor bypass switches. The thyristor bypass switch needs a certain working voltage as an energy-taking voltage during normal operation, otherwise, the thyristor bypass switch cannot act quickly due to unsuccessful energy-taking at the moment of failure, and the safety of equipment is seriously damaged. In the existing engineering, the energy-obtaining voltage of a fast bypass switch at the output end of a converter in fixed position, namely series compensation equipment, is controlled, and when the access position of the fast bypass switch is changed or a plurality of devices are accessed simultaneously, a controller needs to be redesigned. Furthermore, in addition to the fast bypass device, other components may also have operating voltage range requirements. The addition of a plurality of controllers affects the control precision and the dynamic performance of the series compensation equipment, and the independent decoupling design cannot be realized. Therefore, an output voltage control device with a unified structure, simplicity, flexibility and no influence on the original performance is needed, and the output voltage control device is produced by the scheme.
Disclosure of Invention
The invention aims to provide an output voltage control device of series compensation equipment, which solves the problems of coupling of control targets and mutual influence of parameters of an output voltage controller and a main controller, has a simple structure, is flexible to realize and does not influence the original performance of the equipment.
In order to achieve the above purpose, the solution of the invention is:
an output voltage control device of a series compensation device inputs a first apparent power command, a measured value of an output voltage of the series compensation device and outputs a third apparent power command. The measured value of the output voltage of the series compensation device is hereinafter also referred to as the measured value of the output voltage. The first apparent power instruction is a circuit apparent power instruction issued by an operator or a dispatching center, and the third apparent power instruction is a circuit apparent power reference value of the main controller; the device comprises: the device comprises a comparison unit, an adjusting unit, a distribution unit and an adding unit; wherein the content of the first and second substances,
the comparison unit is used for inputting a voltage measured value output by the series compensation equipment, outputting a first output of the enabling adjusting unit, a second output of the enabling adjusting unit and an output signal of the locking allowing adjusting unit;
the regulating unit is used for inputting the output voltage measured value of the series compensation equipment and the output signal of the comparison unit and outputting the output value of the regulating unit;
the distribution unit is used for inputting the output value of the regulating unit and outputting a second apparent power instruction;
and the addition unit is used for inputting the first apparent power instruction and the second apparent power instruction, and adding the first apparent power instruction and the second apparent power instruction to obtain a third apparent power instruction and outputting the third apparent power instruction.
Further, the comparison unit includes a comparator and is provided with an output voltage upper threshold and an output voltage lower threshold; enabling the first output of the regulating unit when the amplitude of the measured value of the output voltage of the series compensation equipment is smaller than the lower threshold of the output voltage; enabling the second output of the adjusting unit when the amplitude of the measured value of the output voltage of the series compensation equipment is larger than the upper threshold of the output voltage; the series compensation device is configured to allow the output of the regulating unit to be latched when the magnitude of the measured value of the output voltage of the series compensation device is between the lower threshold value and the upper threshold value of the output voltage.
Further, the adjusting unit comprises a first proportional-integral regulator and a second proportional-integral regulator, and is provided with an output voltage upper limit value and an output voltage lower limit value; the difference value between the lower limit value of the output voltage and the measured value of the output voltage of the series compensation equipment is processed by a first proportional-integral regulator to obtain a first output value, and the difference value between the upper limit value of the output voltage and the measured value of the output voltage of the series compensation equipment is processed by a second proportional-integral regulator to obtain a second output value; when the output of the adjusting unit is allowed to be locked and the amplitude of the first output value is reduced to zero, the output of the first integral adjuster and the first output of the adjusting unit are locked; when the output of the adjusting unit is allowed to be locked and the amplitude of the second output value is reduced to zero, the output of the second integral adjuster and the second output of the adjusting unit are locked; and adding the first output and the second output of the adjusting unit to obtain an output value of the adjusting unit.
Further, the distribution unit is provided with an active power distribution coefficient and a reactive power distribution coefficient; and multiplying the output value of the adjusting unit by the active power distribution coefficient and the reactive power distribution coefficient respectively to obtain an active power instruction and a reactive power instruction of the second apparent power instruction.
Further, when the component parts in the device also have the requirement of operating voltage range, the voltage of each component part is provided with an independent comparison unit, an independent regulation unit and an independent distribution unit; the second apparent power command is generated by summing the outputs of all of the distribution units.
The invention has the beneficial effects that:
the invention fully considers the unified power flow controller, can convert the requirement that the output voltage in series compensation equipment such as a static compensator, a static synchronous series compensator, a unified power quality regulator and the like has a specific voltage operation range, and the output voltage control device converts the control target output voltage into the power deviation value and only adjusts the input instruction value of the main controller, so that the output voltage controller and the main controller realize decoupling control, and the design and debugging of respective control parameters cannot influence each other. When a plurality of operating voltage controls are added, the controllers of the operating voltages are also decoupled from each other, and the control parameters can be designed independently. Therefore, the control device of the scheme can not influence the original control precision and dynamic performance of the main controller, and the realization mode has a uniform structure, is simple and flexible, and greatly simplifies the design and debugging work of the output voltage controller of the series compensation equipment.
Drawings
FIG. 1 is a schematic diagram of an output voltage control apparatus of the present invention;
FIG. 2 is a schematic diagram of an embodiment of the components of the output voltage control apparatus according to the present invention;
FIG. 3 is a schematic diagram of a multiple voltage controller implementation of the present invention;
fig. 4 is a schematic diagram of a static synchronous series compensator according to one embodiment of the present invention.
Detailed Description
The technical scheme of the invention is explained in detail in the following with the accompanying drawings.
The invention provides an output voltage control device of series compensation equipment. The measured value of the output voltage of the series compensation device is hereinafter also referred to as the measured value of the output voltage. The first apparent power instruction is a circuit apparent power instruction issued by an operator or a dispatching center, and the third apparent power instruction is a circuit apparent power reference value of the main controller; the device comprises: the device comprises a comparison unit, an adjusting unit, a distribution unit and an adding unit; wherein the content of the first and second substances,
the comparison unit is used for inputting a voltage measured value output by the series compensation equipment, outputting a first output of the enabling adjusting unit, a second output of the enabling adjusting unit and an output signal of the locking allowing adjusting unit;
the regulating unit is used for inputting the output voltage measured value of the series compensation equipment and the output signal of the comparison unit and outputting the output value of the regulating unit;
the distribution unit is used for inputting the output value of the regulating unit and outputting a second apparent power instruction;
and the addition unit is used for inputting the first apparent power instruction and the second apparent power instruction, and adding the first apparent power instruction and the second apparent power instruction to obtain a third apparent power instruction and outputting the third apparent power instruction.
Fig. 1 is a schematic diagram of an output voltage control apparatus according to the present invention. Because the series compensation equipment adjusts the power flow of the line by changing the voltage which is connected in series with the power transmission line, namely the output voltage is in a direct proportion relation with the change quantity of the line power, and the control speed requirement of the output voltage is very low compared with the main controller, the output of the output voltage controller can be used as the adjustment quantity of the line power instruction to be input into the main controller to realize the decoupling design of the output voltage controller and the main controller.
In the output voltage control device of the series compensation equipment, the comparison unit includes a comparator and is provided with an output voltage upper threshold and an output voltage lower threshold; enabling the first output of the regulating unit when the amplitude of the measured value of the output voltage of the series compensation equipment is smaller than the lower threshold of the output voltage; enabling the second output of the adjusting unit when the amplitude of the measured value of the output voltage of the series compensation equipment is larger than the upper threshold of the output voltage; the series compensation device is configured to allow the output of the regulating unit to be latched when the magnitude of the measured value of the output voltage of the series compensation device is between the lower threshold value and the upper threshold value of the output voltage.
In the output voltage control device of the series compensation equipment, the regulating unit comprises a first proportional-integral regulator and a second proportional-integral regulator, and is provided with an output voltage upper limit value and an output voltage lower limit value; the difference value between the lower limit value of the output voltage and the measured value of the output voltage of the series compensation equipment is processed by a first proportional-integral regulator to obtain a first output value, and the difference value between the upper limit value of the output voltage and the measured value of the output voltage of the series compensation equipment is processed by a second proportional-integral regulator to obtain a second output value; when the output of the adjusting unit is allowed to be locked and the amplitude of the first output value is reduced to zero, the output of the first integral adjuster and the first output of the adjusting unit are locked; when the output of the adjusting unit is allowed to be locked and the amplitude of the second output value is reduced to zero, the output of the second integral adjuster and the second output of the adjusting unit are locked; and adding the first output and the second output of the adjusting unit to obtain an output value of the adjusting unit.
In the output voltage control device of the series compensation equipment, the distribution unit is provided with an active power distribution coefficient and a reactive power distribution coefficient; and multiplying the output value of the adjusting unit by the active power distribution coefficient and the reactive power distribution coefficient respectively to obtain an active power instruction and a reactive power instruction of the second apparent power instruction.
Fig. 2 shows a specific implementation of each component of the output voltage control apparatus according to the present invention. When the measured value of the output voltage in the comparison unit is lower than the lower threshold value of the output voltage, normally limiting the first output value of the adjustment unit and the output value of the first integral adjuster; the output voltage of the comparison unit is measured to be highAnd when the output voltage is subjected to the upper threshold value, normally limiting the second output value of the regulating unit and the output value of the second integral regulator. When the measured value of the output voltage in the comparison unit is higher than the lower threshold value of the output voltage, if the first output value in the adjustment unit is reduced to 0, the first output value of the adjustment unit and the output value of the first integral adjuster are both limited to 0; when the measured value of the output voltage in the comparison unit is lower than the upper threshold value of the output voltage, if the second output value in the adjustment unit is increased to 0, the second output value of the adjustment unit and the output value of the second integral adjuster are both limited to 0. The lower limit value of the output voltage in the regulating unit is subtracted from the measured value of the output voltage and then passes through a first proportional-integral regulator to obtain a first output value, the upper limit value of the output voltage is subtracted from the measured value of the output voltage and then passes through a second proportional-integral regulator to obtain a second output value, Kp1And Ki1Is a control parameter of a first proportional integral regulator, Kp2And Ki2Is a control parameter of the second proportional-integral regulator. Adding the first output value and the second output value of the regulating unit, and then adding the first output value and the second output value to the active power distribution coefficient MPAnd a reactive power distribution coefficient MQAnd respectively multiplying to obtain a second active power instruction and a second reactive power instruction. Wherein, Kp1、Ki1、Kp2And Ki2The values are all larger than or equal to 0 and are consistent with the positive and negative directions of the integral upper and lower limits and the output amplitude limit of the proportional-integral regulator; mPAnd MQThe positive and negative directions of (a) are determined by the relationship of the output voltage to the line power.
When the components in the device also have the requirement of operating voltage range, the voltage of each component is provided with an independent comparison unit, an independent regulation unit and an independent distribution unit; the second apparent power command is generated by summing the outputs of all of the distribution units as shown in fig. 3.
Fig. 4 shows an application of the output voltage control device of the present invention to a Static Synchronous Series Compensator (SSSC). The output voltage control device is shared with the control device hardware of the series compensation equipment configuration, all units of the output voltage control device are realized in the main control device, and the output voltage measuring device is also shared with the measuring device of the equipment configuration.
The invention fully considers the unified power flow controller, and can convert the requirement that the output voltage in series compensation devices such as a static compensator, a static synchronous series compensator, a unified power quality regulator and the like has a specific voltage operation range. The output voltage control device converts the control target output voltage into the power deviation value and only adjusts the input instruction value of the main controller, so that the output voltage controller and the main controller achieve decoupling control, and the design and debugging of respective control parameters cannot affect each other. When a plurality of operating voltage controls are added, the controllers of the operating voltages are also decoupled from each other, and the control parameters can be designed independently. Therefore, the control method and the control system of the scheme can not influence the original control precision and dynamic performance of the main controller, the realization mode has a uniform structure, is simple and flexible, and greatly simplifies the design and debugging work of the output voltage controller of the series compensation equipment.
The above embodiments are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modifications made on the basis of the technical scheme according to the technical idea of the present invention fall within the protection scope of the present invention.
Claims (5)
1. An output voltage control device of series compensation equipment inputs a first apparent power instruction and a measured value of output voltage of the series compensation equipment and outputs a third apparent power instruction, wherein the first apparent power instruction is a circuit apparent power instruction issued by an operator or a dispatching center, and the third apparent power instruction is a circuit apparent power reference value of a main controller; characterized in that the device comprises: the device comprises a comparison unit, an adjusting unit, a distribution unit and an adding unit; wherein the content of the first and second substances,
the comparison unit is used for inputting a voltage measured value output by the series compensation equipment, outputting a first output of the enabling adjusting unit, a second output of the enabling adjusting unit and an output signal of the locking allowing adjusting unit;
the regulating unit is used for inputting the output voltage measured value of the series compensation equipment and the output signal of the comparison unit and outputting the output value of the regulating unit;
the distribution unit is used for inputting the output value of the regulating unit and outputting a second apparent power instruction;
and the addition unit is used for inputting the first apparent power instruction and the second apparent power instruction, and adding the first apparent power instruction and the second apparent power instruction to obtain a third apparent power instruction and outputting the third apparent power instruction.
2. An output voltage control apparatus of a series compensation device according to claim 1, wherein: the comparison unit comprises a comparator and is provided with an upper output voltage threshold and a lower output voltage threshold; enabling the first output of the regulating unit when the amplitude of the measured value of the output voltage of the series compensation equipment is smaller than the lower threshold of the output voltage; enabling the second output of the adjusting unit when the amplitude of the measured value of the output voltage of the series compensation equipment is larger than the upper threshold of the output voltage; the series compensation device is configured to allow the output of the regulating unit to be latched when the magnitude of the measured value of the output voltage of the series compensation device is between the lower threshold value and the upper threshold value of the output voltage.
3. An output voltage control apparatus of a series compensation device according to claim 1, wherein: the adjusting unit comprises a first proportional-integral adjuster and a second proportional-integral adjuster, and is provided with an output voltage upper limit value and an output voltage lower limit value; the difference value between the lower limit value of the output voltage and the measured value of the output voltage of the series compensation equipment is processed by a first proportional-integral regulator to obtain a first output value, and the difference value between the upper limit value of the output voltage and the measured value of the output voltage of the series compensation equipment is processed by a second proportional-integral regulator to obtain a second output value; when the output of the adjusting unit is allowed to be locked and the amplitude of the first output value is reduced to zero, the output of the first integral adjuster and the first output of the adjusting unit are locked; when the output of the adjusting unit is allowed to be locked and the amplitude of the second output value is reduced to zero, the output of the second integral adjuster and the second output of the adjusting unit are locked; and adding the first output and the second output of the adjusting unit to obtain an output value of the adjusting unit.
4. An output voltage control apparatus of a series compensation device according to claim 1, wherein: the distribution unit is provided with an active power distribution coefficient and a reactive power distribution coefficient; and multiplying the output value of the adjusting unit by the active power distribution coefficient and the reactive power distribution coefficient respectively to obtain an active power instruction and a reactive power instruction of the second apparent power instruction.
5. An output voltage control apparatus of a series compensation device according to claim 1, wherein: when the component parts in the device also have the requirement of operating voltage range, the voltage of each component part is provided with an independent comparison unit, an independent regulation unit and an independent distribution unit; the second apparent power command is generated by summing the outputs of all of the distribution units.
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| CN201810261717.XA CN108429264B (en) | 2018-03-28 | 2018-03-28 | Output voltage control device of series compensation equipment |
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