CN111416343B - Method, device and medium for evaluating DC power boost of power system - Google Patents

Method, device and medium for evaluating DC power boost of power system Download PDF

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CN111416343B
CN111416343B CN202010192728.4A CN202010192728A CN111416343B CN 111416343 B CN111416343 B CN 111416343B CN 202010192728 A CN202010192728 A CN 202010192728A CN 111416343 B CN111416343 B CN 111416343B
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power
direct current
circuit ratio
synchronous phase
effective short
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CN111416343A (en
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田宝烨
姚文峰
黄东启
洪潮
周保荣
郭知非
王彤
杨健
孙鹏伟
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CSG Electric Power Research Institute
China Southern Power Grid Co Ltd
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CSG Electric Power Research Institute
China Southern Power Grid Co Ltd
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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
    • 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
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • 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
    • H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
    • 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
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]

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  • Power Engineering (AREA)
  • Control Of Electrical Variables (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses an evaluation method for DC power boost of an electric power system, which is suitable for the electric power system containing a synchronous phase modulator. And when the effective short-circuit ratio is equal to the critical effective short-circuit ratio, acquiring the maximum direct-current power which can be transmitted by the direct-current system. And evaluating the improvement effect of the synchronous phase modifier on the DC power transmission capability of the DC system according to the difference value of the maximum DC power which can be transmitted by the DC system in two operation states of the synchronous phase modifier in the exit operation and the output with the preset maximum reactive power. The invention also discloses a corresponding device and a medium, and by implementing the method, the improvement effect of the synchronous phase modulator on the single direct current power transmission capability can be accurately evaluated, so that a reference basis is provided for planning construction and operation of a power grid.

Description

Method, device and medium for evaluating DC power boost of power system
Technical Field
The present invention relates to the field of power system technologies, and in particular, to a method, an apparatus, and a medium for evaluating dc power boost of a power system.
Background
With the rapid development of the technical field of power systems, high-voltage direct-current transmission plays an irreplaceable role in large-scale trans-regional transmission of electric energy, and becomes one of the important modes of 'west-east power transmission' in China. However, the dc transmission power needs an ac power grid with a certain strength as a support, and if the ac system is too weak, the power transmission capability of the dc system will be limited. By putting the synchronous phase modulator into operation in the power system, dynamic reactive support can be provided, so that the strength of a power grid is improved, and the transmission power of a direct-current system is improved.
The method has the advantages that the improvement effect of the synchronous phase modulator on the single direct current power transmission capability can be accurately evaluated, the site selection of the synchronous phase modulator, the determination of direct current power instructions and the like can be guided, and the method has great significance for planning and operating the power system. However, in the process of implementing the invention, the inventor finds that the prior art has at least the following problems: at present, the evaluation method for improving the single direct current power transmission capacity of the synchronous phase modulator is less researched, and a learner obtains the maximum power which can be transmitted by direct current by establishing a mathematical model of the system and drawing a power curve of the direct current system after the synchronous phase modulator is put into operation. However, in the process of implementing the invention, the inventor finds that the prior art has at least the following problems: according to the method, the direct current instruction needs to be traversed in a large range, the calculated amount is large, and meanwhile, when the direct current power change cannot be considered, the influence of the alternating current system parameter change on the result can cause inaccuracy of the calculated result.
Disclosure of Invention
The embodiment of the invention aims to provide an evaluation method, an evaluation device and an evaluation medium for the direct current power improvement of an electric power system, which can accurately evaluate the improvement effect of a synchronous phase modifier on the direct current power transmission capacity and provide a reference basis for planning construction and operation of a power grid.
In order to achieve the above object, an embodiment of the present invention provides an evaluation method for dc power boost of an electrical power system, which is applicable to an electrical power system including a synchronous phase modulator, and includes: setting the running state of the power system under the control mode that the synchronous phase modulator is in constant reactive power; the operating state of the power system comprises an operating state that a synchronous phase modulator exits from operating and an operating state that the synchronous phase modulator outputs power with preset maximum reactive power;
acquiring the voltage amplitude of an alternating current bus, the voltage phase of the alternating current bus, active power injected by a direct current system and reactive power consumed by the direct current system of the power system in the current running state; adjusting the direct current instruction according to a preset first instruction adjustment amount, and acquiring the voltage amplitude of the alternating current bus and the voltage phase of the alternating current bus after the direct current instruction changes;
calculating the equivalent impedance of the synchronous phase modifier according to the voltage amplitude of the alternating current bus and the voltage phase of the alternating current bus before and after the direct current instruction of the power system changes;
calculating the equivalent impedance of the power system according to the equivalent impedance of the synchronous phase modulator and the node self-impedance of the alternating-current bus;
calculating an effective short-circuit ratio and a critical effective short-circuit ratio of the power system according to active power injected by the direct-current system, reactive power consumed by the direct-current system and equivalent impedance of the power system;
when the effective short circuit ratio is equal to the critical effective short circuit ratio, taking the active power injected by the direct current system as the maximum direct current power which can be transmitted by the direct current system in the current state;
and evaluating the improvement effect of the synchronous phase modifier on the DC power transmission capability of the DC system according to the difference value of the maximum DC power which can be transmitted by the DC system in the running state that the synchronous phase modifier exits from running and outputs power with preset maximum reactive power.
As an improvement of the above scheme, the calculating the equivalent impedance of the synchronous phase modulator according to the voltage amplitude of the ac bus and the voltage phase of the ac bus before and after the dc current command change of the power system specifically includes:
according to the voltage amplitude of the alternating current bus and the voltage phase of the alternating current bus before and after the direct current instruction of the power system changes, calculating the equivalent impedance of the synchronous phase modulator through the following calculation formula:
Figure BDA0002416485860000031
Figure BDA0002416485860000032
Figure BDA0002416485860000033
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0002416485860000034
is the equivalent impedance of the synchronous phase modulator; u shape 0 The voltage amplitude of the alternating current bus before the direct current instruction is changed,
Figure BDA0002416485860000035
the voltage phase of the alternating current bus before the direct current instruction changes; u shape 1 The voltage amplitude of the alternating current bus after the direct current instruction is changed,
Figure BDA0002416485860000036
the voltage phase of the alternating current bus after the direct current instruction is changed; KS is reactive power injected by the synchronous phase modulator, wherein when the synchronous phase modulator is in an operation state of quitting operation, KS is 0; and when the synchronous phase modulator is in an operating state of outputting power with preset maximum reactive power, KS is the maximum reactive power.
As an improvement of the above scheme, the calculating the equivalent impedance of the power system according to the equivalent impedance of the synchronous phase modulator and the node self-impedance of the ac bus specifically includes:
according to the equivalent impedance of the synchronous phase modulator and the node self-impedance of the alternating current bus, calculating the equivalent impedance of the power system through the following calculation formula:
Figure BDA0002416485860000037
wherein the content of the first and second substances,
Figure BDA0002416485860000038
is an equivalent impedance of the power system;
Figure BDA0002416485860000039
node self-impedance of AC bus, structural parameters of power system, equivalent impedance Z theta and compensating capacitor B for single-feed system C Are connected in parallel.
As an improvement of the above scheme, the calculating an effective short-circuit ratio and a critical effective short-circuit ratio of the power system according to the active power injected by the dc system, the reactive power consumed by the dc system, and the equivalent impedance of the power system specifically includes:
according to the active power injected by the direct current system, the reactive power consumed by the direct current system and the equivalent impedance of the power system, calculating the effective short-circuit ratio and the critical effective short-circuit ratio of the power system by the following calculation formulas:
Figure BDA0002416485860000041
Figure BDA0002416485860000042
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0002416485860000043
is an equivalent impedance of the power system; ESCR is the effective short circuit ratio; CESCR is the critical effective short circuit ratio;
Figure BDA0002416485860000044
is the node self-impedance of the AC bus; p dc0 Active power, Q, injected for DC system before DC current command change dc0 The reactive power consumed by the direct current system before the direct current instruction changes; gamma is the turn-off angle of the direct current system; mu is a commutation angle of a direct current system; theta eq Is the equivalent impedance
Figure BDA0002416485860000045
The phase angle of (c).
As an improvement of the above solution, after calculating an effective short-circuit ratio and a critical effective short-circuit ratio of the power system according to the active power injected by the dc system, the reactive power consumed by the dc system, and the equivalent impedance of the power system, the method further includes:
and when the effective short-circuit ratio is not equal to the critical effective short-circuit ratio, adjusting the direct current instruction according to a preset second instruction adjustment amount, and acquiring the voltage amplitude of an alternating current bus of the power system, the voltage phase of the alternating current bus, the active power injected by the direct current system and the reactive power consumed by the direct current system again.
As an improvement of the above scheme, when the effective short-circuit ratio is not equal to the critical effective short-circuit ratio, adjusting the dc current command according to a preset second command adjustment amount specifically includes:
when the effective short-circuit ratio is not equal to the critical effective short-circuit ratio, judging whether the effective short-circuit ratio is larger than the critical effective short-circuit ratio;
if so, increasing the direct current instruction by taking the preset second instruction adjustment amount as an adjustment step length;
if not, the preset second instruction adjustment amount is used as an adjustment step length, and the direct current instruction is reduced.
As an improvement of the above scheme, the second instruction adjustment amount is 0.1 × | ESCR-CESCR |;
wherein ESCR is the effective short circuit ratio; CESCR is the critical effective short circuit ratio.
The embodiment of the invention also provides an evaluation device for the DC power boost of the power system, which is suitable for the power system containing the synchronous phase modulator and comprises a control mode setting module, an operation parameter acquisition module, a first equivalent impedance calculation module, a second equivalent impedance calculation module, a short-circuit ratio judgment module and a DC power boost evaluation module; wherein the content of the first and second substances,
the control mode setting module is used for setting the running state of the power system under the control mode that the synchronous phase modulator is in constant reactive power; the operating state comprises an operating state that the synchronous phase modulator exits from operating and an operating state that the synchronous phase modulator outputs power with preset maximum reactive power;
the operation parameter acquisition module is used for acquiring the voltage amplitude of an alternating current bus, the voltage phase of the alternating current bus, active power injected by a direct current system and reactive power consumed by the direct current system in the current operation state of the power system; adjusting the direct current instruction according to a preset first instruction adjustment amount, and acquiring the voltage amplitude of the alternating current bus and the voltage phase of the alternating current bus after the direct current instruction changes;
the first equivalent impedance calculation module is used for calculating the equivalent impedance of the synchronous phase modulator according to the voltage amplitude of the alternating current bus and the voltage phase of the alternating current bus before and after the direct current instruction of the power system changes;
the second equivalent impedance calculating module is used for calculating the equivalent impedance of the power system according to the equivalent impedance of the synchronous phase modulator and the node self-impedance of the alternating current bus;
the short circuit ratio calculation module is used for calculating an effective short circuit ratio and a critical effective short circuit ratio of the power system according to active power injected by the direct current system, reactive power consumed by the direct current system and equivalent impedance of the power system;
the short-circuit ratio judging module is used for taking the active power injected by the direct-current system as the maximum direct-current power which can be transmitted by the direct-current system in the current state when the effective short-circuit ratio is equal to the critical effective short-circuit ratio;
and the direct current power promotion evaluation module is used for evaluating the promotion effect of the synchronous phase modifier on the direct current power transmission capability of the direct current system according to the difference value of the maximum direct current power which can be transmitted by the direct current system in the running state that the synchronous phase modifier exits from running and outputs preset maximum reactive power.
The embodiment of the present invention further provides an evaluation apparatus for dc power boost of an electric power system, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, where the processor implements the evaluation method for dc power boost of an electric power system as described in any one of the above items when executing the computer program.
An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, a device on which the computer-readable storage medium is located is controlled to perform the method for evaluating a dc power boost of an electric power system according to any one of the above described methods.
Compared with the prior art, the method, the device and the medium for evaluating the DC power boost of the power system are characterized in that the synchronous phase modulator is set to be in a control mode of constant reactive power; and recording alternating current and direct current operating parameters before and after the current instruction changes by changing the direct current instruction respectively in the operating state that the synchronous phase modulator exits from operation and outputs power with the preset maximum reactive power. According to the recorded operating parameters, the equivalent impedance of the synchronous phase modulator is calculated to further calculate the equivalent impedance of the power system, so that the accuracy of calculating the equivalent impedance of the power system is improved, and finally the effective short-circuit ratio and the critical effective short-circuit ratio of the power system are accurately calculated. Adjusting the direct current instruction according to the calculation result until the effective short-circuit ratio is equal to the critical effective short-circuit ratio, and obtaining the transmissible direct current of the direct current systemThe maximum direct current power to be transmitted. According to the maximum direct current power P which can be transmitted by the direct current system under the condition that the synchronous phase modifier exits from operation and outputs power with preset maximum reactive power 1 And P 2 Evaluating the improvement effect of the synchronous phase modulator on the direct current power transmission capability of the direct current system. The method can consider the influence of alternating current parameter change on the result, has small calculation amount, and can accurately evaluate the improvement effect of the synchronous phase modulator on the single direct current power transmission capacity, thereby providing a reference basis for planning construction and operation of a power grid.
Drawings
Fig. 1 is a schematic structural diagram of an electric power system including a synchronous phase modulator according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating steps of a method for evaluating dc power boost of an electrical power system according to an embodiment of the present invention;
FIG. 3 is a flowchart illustrating steps of a method for evaluating DC power boost of a power system according to a second preferred embodiment of the present invention;
fig. 4 is a schematic structural diagram of an evaluation apparatus for dc power boost of an electric power system according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of an evaluation apparatus for dc power boost of another power system according to a fourth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
Fig. 1 is a schematic structural diagram of an electric power system including a synchronous phase modulator according to an embodiment of the present invention. In the embodiment of the invention, the power system with the synchronous phase modulator comprises an alternating current system, a direct current system and the synchronous phase modulator. In the process of transmitting power by a direct current system, an alternating current power grid with certain strength is required as a support. The synchronous phase modulator can provide dynamic reactive support, improve alternating current power grid intensity, avoid making direct current system's power transmission ability receive the restriction because of alternating current system is too weak to promote direct current's transmission power. The method can guide the work of site selection of the synchronous phase modulator, determination of a direct current power instruction and the like by accurately evaluating the improvement effect of the synchronous phase modulator on the direct current power transmission capacity, and has great significance for planning and operating a power system.
Fig. 2 is a schematic flow chart illustrating steps of a method for evaluating dc power boost of an electrical power system according to an embodiment of the present invention. The method for evaluating the direct current power boost of the power system provided by the embodiment of the invention is suitable for the power system containing a synchronous phase modulator, and comprises the following steps of S1 to S7:
s1, setting the running state of the power system in a control mode that the synchronous phase modulator is in constant reactive power; the operating state of the power system comprises an operating state that the synchronous phase modulator exits from operating and an operating state that the synchronous phase modulator outputs power at a preset maximum reactive power.
And adjusting the control mode of the synchronous phase modulator to be constant reactive power, so that the reactive power of the injection system of the synchronous phase modulator is constant. In the subsequent adjustment process of the operating parameters of the alternating current system and the direct current system, the value of the reactive power of the injection system of the synchronous phase modifier is not changed, so that the accuracy in calculating the improvement effect of the synchronous phase modifier on the transmission power of the direct current system is ensured.
After the control mode of the power system is adjusted, the power system is set to stop running in the synchronous phase modulator or run in the running state that the synchronous phase modulator outputs power with the preset maximum reactive power.
S2, acquiring the voltage amplitude of an alternating current bus, the voltage phase of the alternating current bus, active power injected by a direct current system and reactive power consumed by the direct current system in the current running state of the power system; and adjusting the direct current instruction according to a preset first instruction adjustment amount, and acquiring the voltage amplitude of the alternating current bus and the voltage phase of the alternating current bus after the direct current instruction changes.
Under the current operation state of the power system, the operation parameters of the alternating current and direct current power grid, including the voltage amplitude and phase of the alternating current bus, the active power injected by direct current, the reactive power consumed by the direct current, the turn-off angle and the phase change angle of the direct current under the rated state and the like, are obtained, the direct current instruction is changed, and the voltage amplitude and the phase of the alternating current bus after the direct current instruction is changed are recorded.
And S3, calculating the equivalent impedance of the synchronous phase modulator according to the voltage amplitude of the alternating current bus and the voltage phase of the alternating current bus before and after the direct current instruction of the power system changes.
As a preferred embodiment, according to the voltage amplitude and phase of the ac bus before and after the dc current command is changed, the equivalent impedance of the synchronous phase modulator is calculated by the following calculation formula:
Figure BDA0002416485860000081
Figure BDA0002416485860000082
Figure BDA0002416485860000083
wherein the content of the first and second substances,
Figure BDA0002416485860000084
is the equivalent impedance of the synchronous phase modulator; u shape 0 The voltage amplitude of the alternating current bus before the direct current command is changed,
Figure BDA0002416485860000085
the voltage phase of the alternating current bus before the direct current instruction changes; u shape 1 The voltage amplitude of the alternating current bus after the direct current instruction is changed,
Figure BDA0002416485860000086
the voltage phase of the alternating current bus after the direct current instruction is changed; KS is reactive power injected by the synchronous phase modulator, wherein when the synchronous phase modulator is in a running state of quitting running, KS is 0; and when the synchronous phase modulator is in an operating state of outputting power with preset maximum reactive power, KS is the maximum reactive power.
And S4, calculating the equivalent impedance of the power system according to the equivalent impedance of the synchronous phase modulator and the node self-impedance of the alternating current bus.
After the equivalent impedance of the synchronous phase modulator is calculated, the equivalent impedance of the power system is calculated by combining the node self-impedance of an alternating current bus through the following calculation formula:
Figure BDA0002416485860000091
wherein the content of the first and second substances,
Figure BDA0002416485860000092
is an equivalent impedance of the power system;
Figure BDA0002416485860000093
node self-impedance of AC bus, structural parameters of the power system, equivalent impedance Z & lttheta & gt and compensation capacitor B of AC system for single-feed system c Are connected in parallel.
In the embodiment of the invention, a certain error usually exists in the simulation calculation process of the power system, the equivalent impedance of the synchronous phase modulator is calculated according to the acquired operating parameters of the AC and DC systems, and then the equivalent impedance of the power system is further calculated according to the equivalent impedance of the synchronous phase modulator.
And S5, calculating the effective short-circuit ratio and the critical effective short-circuit ratio of the electric power system according to the active power injected by the direct-current system, the reactive power consumed by the direct-current system and the equivalent impedance of the electric power system.
As a preferred embodiment, the effective short-circuit ratio and the critical effective short-circuit ratio of the electric power system are calculated by the following calculation formulas according to the first operation parameter group and the equivalent impedance of the electric power system:
Figure BDA0002416485860000094
Figure BDA0002416485860000095
wherein, the first and the second end of the pipe are connected with each other,
Figure BDA0002416485860000096
is an equivalent impedance of the power system; ESCR is the effective short circuit ratio; CESCR is the critical effective short circuit ratio;
Figure BDA0002416485860000101
is the node self-impedance of the AC bus; p dc0 Active power, Q, injected for DC system before DC command change dc0 The reactive power consumed by the direct current system before the direct current instruction changes; gamma is the turn-off angle of the direct current system; mu is a commutation angle of a direct current system; theta eq Is the equivalent impedance
Figure BDA0002416485860000102
The phase angle of (c).
And S6, when the effective short circuit ratio is equal to the critical effective short circuit ratio, taking the active power injected by the direct current system as the maximum direct current power which can be transmitted by the direct current system in the current state.
And S7, evaluating the improvement effect of the synchronous phase modifier on the direct-current power transmission capability of the direct-current system according to the difference value of the maximum direct-current power which can be transmitted by the direct-current system in the running state that the synchronous phase modifier exits from running and outputs the power with the preset maximum reactive power.
In the present embodiment of the present invention,and calculating an Effective Short Circuit Ratio (ESCR) and a Critical Effective Short Circuit Ratio (CESCR) of the power system respectively in two running states of the synchronous phase modulator exiting running and outputting with preset maximum reactive power, wherein if the ESCR is equal to the CESCR, the active power injected by the direct current before the direct current instruction changes is the maximum power which can be transmitted by the direct current system. Thereby obtaining the maximum direct current power P which can be transmitted by the direct current system under the operation state that the synchronous phase modulator is out of operation 1 And the maximum direct current power P which can be transmitted by the direct current system in the running state that the synchronous phase modulator outputs power with the preset maximum reactive power 2 Calculating Δ P = P 2 -P 1 The effect of the synchronous phase modulator on improving the power transmission capability of the direct-current system can be evaluated.
Fig. 3 is a schematic flow chart illustrating steps of a method for evaluating dc power boost of a power system according to a second preferred embodiment of the present invention. The second embodiment of the invention is implemented on the basis of the first embodiment, and comprises all the implementation steps and beneficial effects of the first embodiment.
After step S5, that is, calculating the effective short-circuit ratio and the critical effective short-circuit ratio of the power system, the method further includes the steps of:
and S8, when the effective short-circuit ratio is not equal to the critical effective short-circuit ratio, adjusting the direct current instruction according to a preset second instruction adjustment amount, skipping to the step S2, and re-acquiring the voltage amplitude of an alternating current bus of the power system, the voltage phase of the alternating current bus, the active power injected by the direct current system and the reactive power consumed by the direct current system.
As a preferred embodiment, the dc system is adjusted in advance to work in a control mode of constant dc current and turn-off angle, so that the acquisition of ac/dc operation parameters and the like in the following process is facilitated, and the accuracy of calculation is improved.
The method is characterized in that a direct current system is set to be a control mode of constant direct current and turn-off angle, and the synchronous phase modulator is set to be a control mode of constant reactive power. By setting the synchronous phase modifier to quit operation, the operating parameters of the AC/DC system are measured in the operating state that the synchronous phase modifier does not generate reactive power, including ACVoltage amplitude U of current bus 0 Voltage phase of AC bus
Figure BDA0002416485860000111
Active power P injected by direct current system dc0 Reactive power Q consumed by direct current system dc0 And obtaining the turn-off angle gamma and the commutation angle mu of the direct current system in a rated state. And then, taking a preset first instruction adjustment amount as an adjustment step length, increasing or decreasing the direct current instruction, and acquiring operation parameters of the power system after the direct current instruction changes, including the voltage amplitude U of the alternating current bus 1 Voltage phase of AC bus
Figure BDA0002416485860000112
Specifically, the first command adjustment amount is preset according to the actual operating condition of the power system and experience knowledge of a person skilled in the art, for example, the first command adjustment amount may be set to 0.01, or may be other suitable values, without affecting the beneficial effects achieved by the present invention.
And finally, after acquiring the operation parameter group of the power system in the operation state that the synchronous phase modulator exits from operation, calculating the effective short-circuit ratio ESCR and the critical effective short-circuit ratio CESCR of the power system. When the calculated effective short-circuit ratio ESCR is equal to the critical effective short-circuit ratio CESCR, the active power P injected by the DC system is adjusted before the DC command is adjusted dc0 I.e. the maximum direct current power P which can be transmitted by the direct current system when the synchronous phase modulator is in the running state of running off 1 。
In another embodiment, referring to fig. 3, if the effective short-circuit ratio is not equal to the critical effective short-circuit ratio calculated by obtaining the ac/dc operating parameters, the dc current command is adjusted according to a preset second command adjustment amount, and the operating parameters of the power system, including the voltage amplitude U of the ac bus, are obtained again 0 Ac bus voltage phase
Figure BDA0002416485860000113
Active power P injected by direct current system dc0 Reactive power Q consumed by direct current system dc0 The method comprises the steps of obtaining a direct current command, obtaining a shutdown angle gamma and a commutation angle mu of a direct current system in a rated state, and increasing or decreasing a voltage amplitude U of an alternating current bus of the power system after the direct current command is carried out 1 Ac bus voltage phase
Figure BDA0002416485860000114
Continuing to calculate the effective short-circuit ratio ESCR and the critical effective short-circuit ratio CESCR until ESCR equals CESCR, and injecting active power P into the DC system dc0 The maximum direct current power which can be transmitted by the direct current system is set in the running state that the synchronous phase modifier exits from running.
Specifically, when the effective short-circuit ratio is not equal to the critical effective short-circuit ratio, judging whether the effective short-circuit ratio is larger than the critical effective short-circuit ratio; if so, increasing the direct current instruction by taking the preset second instruction adjustment quantity as an adjustment step length; if not, the preset second instruction adjustment quantity is used as an adjustment step length, and the direct current instruction is reduced.
Preferably, the second instruction adjustment amount is 0.1 × | ESCR-CESCR |; wherein ESCR is the effective short circuit ratio; CESCR is the critical effective short circuit ratio.
Further, by setting the reactive power of the injection system of the synchronous phase modulator to be the preset maximum reactive power, according to the same method, measuring the operation parameters of the synchronous phase modulator in the operation state of outputting the preset maximum reactive power, calculating the corresponding effective short-circuit ratio ESCR and critical effective short-circuit ratio CESCCR, adjusting the direct current instruction until the effective short-circuit ratio ESCR is equal to the critical effective short-circuit ratio CESCCR, and injecting the active power P into the direct current system dc0 Setting the maximum direct current power P capable of being transmitted by the direct current system under the running state that the synchronous phase modulator outputs power with the preset maximum reactive power 2 。
Finally, by calculating Δ P = P 2 -P 1 The work of the synchronous phase modulator on a direct current system can be evaluatedThe improvement of the conveying capacity.
Specifically, the value of Δ P can be directly used as the boost effect of the synchronous phase modulator on the power transmission capability of the dc system. A plurality of lifting action grades can also be preset, such as a plurality of grades with strong lifting action, medium lifting action, weak lifting action, no lifting action and the like, and the mapping relation between each lifting action grade and the corresponding range interval of the delta P is matched, so that the corresponding lifting action grade is obtained according to the calculated value of the delta P, and the lifting action of the synchronous phase modulator on the power transmission capability is evaluated. The value of Δ P may also be normalized to a corresponding score, so that the improvement of the power transfer capability of the synchronization phase modulator can be evaluated based on the calculated value of Δ P. The beneficial effects obtained by the invention are not affected.
The embodiment of the invention provides an evaluation method for DC power boost of an electric power system, which is characterized in that a synchronous phase modulator is set as a control mode of constant reactive power; and recording alternating current and direct current operating parameters before and after the current instruction changes by changing the direct current instruction respectively in the operating state that the synchronous phase modulator exits from operation and outputs power with the preset maximum reactive power. According to the recorded operating parameters, the equivalent impedance of the synchronous phase modulator is calculated to further calculate the equivalent impedance of the power system, so that the accuracy of calculating the equivalent impedance of the power system is improved, and finally the effective short-circuit ratio and the critical effective short-circuit ratio of the power system are accurately calculated. And adjusting the direct current instruction according to the calculation result until the effective short-circuit ratio is equal to the critical effective short-circuit ratio, and acquiring the maximum direct current power which can be transmitted by the direct current system. According to the maximum direct current power P which can be transmitted by the direct current system under the condition that the synchronous phase modifier exits from operation and outputs power with preset maximum reactive power 1 And P 2 Evaluating the improvement effect of the synchronous phase modulator on the direct current power transmission capability of the direct current system. The method can consider the influence of alternating current parameter change on the result, has small calculation amount, and can accurately evaluate the improvement effect of the synchronous phase modulator on the single direct current power transmission capacity, thereby providing a reference basis for planning construction and operation of a power grid.
Fig. 4 is a schematic structural diagram of an evaluation apparatus for dc power boost of an electrical power system in a third embodiment of the present invention. The evaluation device 30 for dc power boost of the power system provided in the embodiment of the present invention is suitable for a power system including a synchronous phase modulator, and includes a control mode setting module 31, an operation parameter obtaining module 32, a first equivalent impedance calculating module 33, a second equivalent impedance calculating module 34, a short-circuit ratio calculating module 35, a short-circuit ratio judging module 36, and a dc power boost evaluation module 37; wherein the content of the first and second substances,
the control mode setting module 31 is configured to set an operating state of the power system in a control mode in which the synchronous phase modulator is at a constant reactive power; the running state comprises a running state that the synchronous phase modulator exits running and a running state that the synchronous phase modulator outputs power at a preset maximum reactive power;
the operation parameter obtaining module 32 is configured to obtain a voltage amplitude of the ac bus, a voltage phase of the ac bus, active power injected by the dc system, and reactive power consumed by the dc system in a current operation state of the power system; adjusting the direct current instruction according to a preset first instruction adjustment amount, and acquiring the voltage amplitude of the alternating current bus and the voltage phase of the alternating current bus after the direct current instruction changes;
the first equivalent impedance calculating module 33 is configured to calculate an equivalent impedance of the synchronous phase modulator according to a voltage amplitude of the ac bus and a voltage phase of the ac bus before and after a dc current instruction of the power system changes;
the second equivalent impedance calculating module 34 is configured to calculate an equivalent impedance of the power system according to the equivalent impedance of the synchronous phase modulator and a node self-impedance of the ac bus;
the short-circuit ratio calculating module 35 is configured to calculate an effective short-circuit ratio and a critical effective short-circuit ratio of the electric power system according to the active power injected by the dc system, the reactive power consumed by the dc system, and the equivalent impedance of the electric power system;
the short-circuit ratio determining module 36 is configured to, when the effective short-circuit ratio is equal to the critical effective short-circuit ratio, use the active power injected by the dc system as the maximum dc power that can be transmitted by the dc system in the current state.
The dc power boost evaluation module 37 is configured to evaluate a boost effect of the synchronous phase modulator on a dc power transmission capability of the dc system according to a difference between a maximum dc power transmittable by the dc system in a state where the synchronous phase modulator is out of operation and is outputting a preset maximum reactive power.
Preferably, the short-circuit ratio determining module 36 is further configured to:
and when the effective short-circuit ratio is not equal to the critical effective short-circuit ratio, adjusting the direct current instruction according to a preset second instruction adjustment amount, and acquiring the voltage amplitude of an alternating current bus of the power system, the voltage phase of the alternating current bus, the active power injected by the direct current system and the reactive power consumed by the direct current system again.
It should be noted that, the evaluation apparatus for dc power boost of an electrical power system according to the embodiment of the present invention is used to execute all the process steps of the evaluation method for dc power boost of an electrical power system according to the first embodiment or the second embodiment, and the working principles and beneficial effects of the two are in one-to-one correspondence, so that details are not repeated.
The evaluation device for the direct current power boost of the power system provided by the embodiment of the invention sets the synchronous phase modulator as a control mode of constant reactive power; and recording alternating current and direct current operating parameters before and after the current instruction changes by changing the direct current instruction respectively in the operating state that the synchronous phase modulator exits from operation and outputs power with the preset maximum reactive power. According to the recorded operating parameters, the equivalent impedance of the synchronous phase modulator is calculated to further calculate the equivalent impedance of the power system, so that the accuracy of calculating the equivalent impedance of the power system is improved, and finally the effective short-circuit ratio and the critical effective short-circuit ratio of the power system are accurately calculated. Adjusting the direct current instruction according to the calculation result until the effective short-circuit ratio is equal to the critical effective short-circuit ratio, and acquiring the most transmissible direct current of the direct current systemHigh direct current power. According to the maximum direct current power P which can be transmitted by the direct current system in the running state that the synchronous phase modulator exits from running and outputs power with preset maximum reactive power 1 And P 2 Evaluating the improvement effect of the synchronous phase modulator on the direct current power transmission capability of the direct current system. The method can consider the influence of alternating current parameter change on the result, has small calculation amount, and can accurately evaluate the improvement effect of the synchronous phase modulator on the single direct current power transmission capacity, thereby providing a reference basis for planning construction and operation of a power grid.
Fig. 5 is a schematic structural diagram of another evaluation apparatus for dc power boost of an electrical power system according to the fourth embodiment of the present invention. The evaluation apparatus 40 for dc power boost of the power system provided in the embodiment of the present invention includes a processor 41, a memory 42, and a computer program stored in the memory and configured to be executed by the processor, and when the processor executes the computer program, the evaluation method for dc power boost of the power system according to the first embodiment or the second embodiment is implemented.
An embodiment four of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored computer program, and when the computer program runs, the apparatus where the computer-readable storage medium is located is controlled to execute the method for evaluating dc power boost of an electric power system according to the first embodiment or the second embodiment.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above may be implemented by a computer program, which may be stored in a computer readable storage medium and executed by a computer to implement the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-only memory (ROM), a Random Access Memory (RAM), or the like.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.

Claims (10)

1. An evaluation method for DC power boost of an electric power system is suitable for the electric power system with a synchronous phase modifier, and is characterized by comprising the following steps:
setting the running state of the power system under the control mode that the synchronous phase modulator is in constant reactive power; the operating state of the power system comprises an operating state that a synchronous phase modulator exits from operating and an operating state that the synchronous phase modulator outputs power with preset maximum reactive power;
acquiring the voltage amplitude of an alternating current bus, the voltage phase of the alternating current bus, active power injected by a direct current system and reactive power consumed by the direct current system of the power system in the current running state; adjusting the direct current instruction according to a preset first instruction adjustment amount, and acquiring the voltage amplitude of the alternating current bus and the voltage phase of the alternating current bus after the direct current instruction changes;
calculating the equivalent impedance of the synchronous phase modulator according to the voltage amplitude of the alternating current bus and the voltage phase of the alternating current bus before and after the direct current instruction of the power system changes;
calculating the equivalent impedance of the power system according to the equivalent impedance of the synchronous phase modulator and the node self-impedance of the alternating current bus;
calculating an effective short-circuit ratio and a critical effective short-circuit ratio of the power system according to active power injected by the direct-current system, reactive power consumed by the direct-current system and equivalent impedance of the power system;
when the effective short circuit ratio is equal to the critical effective short circuit ratio, taking the active power injected by the direct current system as the maximum direct current power which can be transmitted by the direct current system in the current state;
and evaluating the improvement effect of the synchronous phase modifier on the DC power transmission capability of the DC system according to the difference value of the maximum DC power which can be transmitted by the DC system in the state that the synchronous phase modifier exits from the operation and outputs power with the preset maximum reactive power.
2. The method for evaluating dc power boost of an electric power system according to claim 1, wherein said calculating an equivalent impedance of the synchronous phase modifier according to the voltage amplitude of the ac bus and the voltage phase of the ac bus before and after the dc current command change of the electric power system specifically comprises:
according to the voltage amplitude of the alternating current bus and the voltage phase of the alternating current bus before and after the direct current instruction of the power system changes, calculating the equivalent impedance of the synchronous phase modulator through the following calculation formula:
Figure FDA0002416485850000021
Figure FDA0002416485850000022
Figure FDA0002416485850000023
wherein the content of the first and second substances,
Figure FDA0002416485850000024
the equivalent impedance of the synchronous phase modulator; u shape 0 The voltage amplitude of the alternating current bus before the direct current command is changed,
Figure FDA0002416485850000025
the voltage phase of the alternating current bus before the direct current instruction changes; u shape 1 The voltage amplitude of the alternating current bus after the direct current instruction is changed,
Figure FDA0002416485850000026
the voltage phase of the alternating current bus after the direct current instruction is changed; KSReactive power injected for the synchronous phase modulator, wherein KS is 0 when the synchronous phase modulator is in an off-going operating state; and when the synchronous phase modulator is in an operating state of outputting power with preset maximum reactive power, KS is the maximum reactive power.
3. The method according to claim 2, wherein the calculating the equivalent impedance of the power system according to the equivalent impedance of the synchronous phase modulator and the node self-impedance of the ac busbar comprises:
according to the equivalent impedance of the synchronous phase modulator and the node self-impedance of the alternating current bus, calculating the equivalent impedance of the power system through the following calculation formula:
Figure FDA0002416485850000027
wherein, the first and the second end of the pipe are connected with each other,
Figure FDA0002416485850000028
is an equivalent impedance of the power system;
Figure FDA0002416485850000029
is the node self-impedance of the ac busbar.
4. The method for evaluating dc power boost of an electric power system according to claim 3, wherein said calculating the effective short-circuit ratio and the critical effective short-circuit ratio of the electric power system according to the active power injected by the dc system, the reactive power consumed by the dc system and the equivalent impedance of the electric power system comprises:
according to the active power injected by the direct current system, the reactive power consumed by the direct current system and the equivalent impedance of the power system, calculating the effective short-circuit ratio and the critical effective short-circuit ratio of the power system by the following calculation formulas:
Figure FDA0002416485850000031
Figure FDA0002416485850000032
wherein the content of the first and second substances,
Figure FDA0002416485850000033
is an equivalent impedance of the power system; ESCR is the effective short circuit ratio; CESCR is the critical effective short circuit ratio;
Figure FDA0002416485850000034
is the node self-impedance of the AC bus; p dc0 Active power, Q, injected for DC system before DC command change dc0 The reactive power consumed by the direct current system before the direct current instruction changes; gamma is the turn-off angle of the direct current system; mu is a commutation angle of a direct current system; theta.theta. eq Is the equivalent impedance
Figure FDA0002416485850000035
The phase angle of (c).
5. The method for evaluating a dc power boost of a power system according to claim 1, further comprising, after said calculating an effective short-circuit ratio and a critical effective short-circuit ratio of said power system based on an active power injected by said dc system, a reactive power consumed by said dc system and an equivalent impedance of said power system:
and when the effective short-circuit ratio is not equal to the critical effective short-circuit ratio, adjusting the direct current instruction according to a preset second instruction adjustment amount, and acquiring the voltage amplitude of an alternating current bus of the power system, the voltage phase of the alternating current bus, the active power injected by the direct current system and the reactive power consumed by the direct current system again.
6. The method as claimed in claim 5, wherein the step of adjusting the dc current command according to a second command adjustment amount when the effective short-circuit ratio is not equal to the critical effective short-circuit ratio comprises:
when the effective short-circuit ratio is not equal to the critical effective short-circuit ratio, judging whether the effective short-circuit ratio is larger than the critical effective short-circuit ratio;
if so, increasing the direct current instruction by taking the preset second instruction adjustment amount as an adjustment step length;
if not, the preset second instruction adjustment amount is used as an adjustment step length, and the direct current instruction is reduced.
7. The method according to claim 5, wherein the second command adjustment amount is 0.1 × | ESCR-CESCR |;
wherein ESCR is the effective short circuit ratio; CESCR is the critical effective short circuit ratio.
8. The evaluation device for the direct current power boost of the power system is characterized by being suitable for the power system comprising a synchronous phase modulator and comprising a control mode setting module, an operation parameter acquisition module, a first equivalent impedance calculation module, a second equivalent impedance calculation module, a short-circuit ratio judgment module and a direct current power boost evaluation module; wherein the content of the first and second substances,
the control mode setting module is used for setting the running state of the power system under the control mode that the synchronous phase modulator is in constant reactive power; the running state comprises a running state that the synchronous phase modulator exits running and a running state that the synchronous phase modulator outputs power at a preset maximum reactive power;
the operation parameter acquisition module is used for acquiring the voltage amplitude of an alternating current bus, the voltage phase of the alternating current bus, the active power injected by the direct current system and the reactive power consumed by the direct current system in the current operation state of the power system; adjusting the direct current instruction according to a preset first instruction adjustment amount, and acquiring the voltage amplitude of the alternating current bus and the voltage phase of the alternating current bus after the direct current instruction changes;
the first equivalent impedance calculation module is used for calculating the equivalent impedance of the synchronous phase modulator according to the voltage amplitude of the alternating current bus and the voltage phase of the alternating current bus before and after the direct current instruction of the power system changes;
the second equivalent impedance calculating module is used for calculating the equivalent impedance of the power system according to the equivalent impedance of the synchronous phase modulator and the node self-impedance of the alternating current bus;
the short circuit ratio calculation module is used for calculating an effective short circuit ratio and a critical effective short circuit ratio of the power system according to active power injected by the direct current system, reactive power consumed by the direct current system and equivalent impedance of the power system;
the short-circuit ratio judging module is used for taking the active power injected by the direct-current system as the maximum direct-current power which can be transmitted by the direct-current system in the current state when the effective short-circuit ratio is equal to the critical effective short-circuit ratio;
the direct current power improvement evaluation module is used for evaluating the improvement effect of the synchronous phase modifier on the direct current power transmission capacity of the direct current system according to the difference value of the maximum direct current power which can be transmitted by the direct current system in the state that the synchronous phase modifier exits from operation and outputs power with the preset maximum reactive power.
9. An apparatus for evaluating a dc power boost of an electrical power system, comprising a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor, the processor implementing the method for evaluating a dc power boost of an electrical power system according to any one of claims 1 to 7 when executing the computer program.
10. A computer-readable storage medium, comprising a stored computer program, wherein when the computer program is run, the computer-readable storage medium is controlled to implement the method for estimating dc power boost of an electric power system according to any one of claims 1 to 7.
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