CN116885680A - Direct current power modulation method and system suitable for asynchronous and synchronous power grid - Google Patents
Direct current power modulation method and system suitable for asynchronous and synchronous power grid Download PDFInfo
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- 238000013316 zoning Methods 0.000 claims description 3
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Classifications
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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
- H02J1/00—Circuit arrangements for dc mains or dc 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
-
- 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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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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
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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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
- 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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Abstract
The application discloses a direct current power modulation method and a system suitable for a different synchronous power grid, wherein the method comprises the following steps: if the stability control device sends a partition asynchronous mode signal to the flexible direct current control system according to the running state of the power grid, the partition asynchronous mode signal is used for controlling a direct current power modulation controller to generate a first direct current power modulation quantity, the first direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted; and if the stability control device sends a large-area networking mode signal to the flexible direct current control system according to the running state of the power grid, the large-area networking mode signal is used for controlling the direct current power modulation controller to generate a second direct current power modulation quantity, the second direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted.
Description
Technical Field
The application relates to a direct current power modulation method suitable for a different synchronous power grid, in particular to a direct current power modulation method and system suitable for a different synchronous power grid.
Background
The 2016 southern power grid has implemented an asynchronous networking architecture in which the Yunnan power grid is connected to the main network via direct current. The Guangdong power grid is used for constructing a back-to-back flexible-direct project and a 500kV alternating current new outer ring of two channels in a bay area and in the south. By 2030, the Guangdong grid may develop into east-west partitioned flexible direct current asynchronous networking. According to the smart grid planning research report (manuscript delivery), the middle-long-term south grid may form 3-4 asynchronous grids.
The flexible direct current has the flexible modulation performance of rapid power adjustment and rapid power reversal, the direct current modulation control function with alternating current characteristic is researched and implemented, the direct current modulation control function can be simulated into alternating current connecting lines, and under the conditions of tripping, direct current locking, alternating current line tripping and the like, the rapid and automatic control of the direct current power and the mutual power balance of the double-side alternating current system are realized according to the state change of the electric quantity of the double-side system, so that the system is favorable for the recovery stability.
However, in the multi-partition power grid construction process, multiple power grid operation modes of a large-area networking and a partition asynchronous power grid exist, and stable switching of the two modes cannot be processed in the prior art.
Disclosure of Invention
Aiming at the defects in the prior art, the application provides the direct current power modulation method and the direct current power modulation system which are suitable for the asynchronous power grid, can be suitable for different power grid operation modes, not only meet the direct current power modulation requirement of a large-area networking mode, but also meet the direct current power modulation requirement of a zoned asynchronous mode, can realize the rapid automatic control of the direct current power and the mutual power balance of a double-side alternating current system, and is beneficial to improving the stability of the power grid system.
In order to achieve the above purpose, the present application provides the following technical solutions:
in a first aspect, the present application provides a method for modulating dc power adapted to a heterosynchronous power grid, comprising:
if the stability control device sends a partition asynchronous mode signal to the flexible direct current control system according to the running state of the power grid, the partition asynchronous mode signal is used for controlling a direct current power modulation controller to generate a first direct current power modulation quantity, the first direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted;
and if the stability control device sends a large-area networking mode signal to the flexible direct current control system according to the running state of the power grid, the large-area networking mode signal is used for controlling the direct current power modulation controller to generate a second direct current power modulation quantity, the second direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted.
In a second aspect, the present application provides a dc power modulation system adapted to a heterosynchronous power grid, comprising:
a dc power modulation controller for performing:
if the stability control device sends a partition asynchronous mode signal to the flexible direct current control system according to the running state of the power grid, the partition asynchronous mode signal is used for controlling a direct current power modulation controller to generate a first direct current power modulation quantity, the first direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted;
and if the stability control device sends a large-area networking mode signal to the flexible direct current control system according to the running state of the power grid, the large-area networking mode signal is used for controlling the direct current power modulation controller to generate a second direct current power modulation quantity, the second direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted.
Compared with the prior art, the application has the beneficial effects that: the application can adapt to different power grid operation modes, not only meets the direct current power modulation requirement of a large-area networking mode, but also meets the direct current power modulation requirement of a zoned asynchronous mode, can realize the rapid and automatic control of the direct current power and the mutual power balance of a double-side alternating current system, and is beneficial to improving the stability of a power grid system.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following description will briefly explain the drawings needed in the embodiments, and it is obvious that the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a DC power modulation controller in a block asynchronous mode according to an embodiment of the present application;
fig. 2 is a schematic diagram of a dc power modulation controller in a large area networking mode according to an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Examples:
it should be noted that the terms "first," "second," and the like in the description and the claims of the present application and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed or inherent to such process, method, article, or apparatus.
A method of dc power modulation adapted to a heterosynchronous power grid, comprising:
if the stability control device sends a partition asynchronous mode signal to the flexible direct current control system according to the running state of the power grid, the partition asynchronous mode signal is used for controlling a direct current power modulation controller to generate a first direct current power modulation quantity, the first direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted;
and if the stability control device sends a large-area networking mode signal to the flexible direct current control system according to the running state of the power grid, the large-area networking mode signal is used for controlling the direct current power modulation controller to generate a second direct current power modulation quantity, the second direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted.
In some embodiments, the method for generating the first dc power modulation amount includes:
the direct current measurement system measures and calculates the frequencies f1 and f2 at two sides of the direct current transmission system in real time to obtain delta f1 and delta f2;
and delta f1 and delta f2 are used as input of an asynchronous power grid frequency synchronous operation controller, and after filtering, blocking, PI control and amplitude limiting control links, the first direct current power modulation quantity is calculated, wherein delta f1 and delta f2 are differences between the frequencies f1 and f2 at two sides of the back-to-back converter station and the rated frequency.
In some embodiments, the method for generating the second dc power modulation amount includes:
the direct current measuring system measures and calculates phase angle differences phi 1-phi 2 at two sides of the direct current transmission system in real time, compares the phase angle differences with the phase angle differences of the direct current transmission systems at two sides under the steady state condition, and calculates a second direct current power modulation quantity through a P control link and a limiting control link.
In some embodiments, before sending the "partition asynchronous mode" signal and the "large area networking mode" signal, further comprising:
the operation interface of the operator is provided with a switching button of a control function of a direct current power modulation function of the asynchronous power grid, and the operator performs manual switching operation on the functions of sending a signal of a zoning asynchronous mode and a signal of a large-area networking mode through the switching button.
In some embodiments, after the "asynchronous and synchronous power grid direct current power modulation function" is put into, the FLC function of the flexible direct current unit is automatically shielded.
In some embodiments, when the stabilizing device acts during the dc operation, the stabilizing device exits the "out-of-step power grid dc power modulation function" after acting.
In some embodiments, when the operator exits the button of the control function of the "abnormal synchronous power grid dc power modulation function", the abnormal synchronous power grid dc power modulation function controller fails, and the controller output is 0.
In a certain complete embodiment, a direct current power modulation method suitable for a asynchronous and synchronous power grid is specifically implemented as follows:
(1) The operation interface HMI of the operator is provided with a switching button of a control function of a direct current power modulation function of the asynchronous and synchronous power grid, and the operator can manually switch the function through the switching button.
(2) After the switching button of the control function of the asynchronous power grid direct current power modulation function is switched on, if the stability control device sends a zoned asynchronous mode signal to the flexible direct current control system according to the running state of the power grid, the direct current power modulation controller is selected as follows:
the direct current measurement system measures and calculates the frequencies f1 and f2 at two sides of the direct current transmission system in real time, calculates and obtains delta f1 and delta f2, and is used as the input of the asynchronous power grid frequency synchronous operation controller shown in fig. 1, the direct current power modulation quantity is calculated and obtained through a series of control links such as filtering, blocking, PI control and limiting of the controller shown in fig. 1, and the direct current power modulation quantity is superimposed on a direct current power reference value, and the actual operation power of the flexible direct current is automatically adjusted.
In fig. 1: Δf1 and Δf2 are differences between frequencies f1 and f2 on two sides of the back-to-back converter station and the rated frequency, and Δp is the modulation amount of the direct current power; t1 is a filtering time constant, and takes 6ms; k is an amplification factor, and 15 is taken; kp and Ki are proportionality constants and integration constants, which are determined by systematic simulation analysis studies, for a lukeback-to-back direct current, kp=0.045, ki=36.
(3) After the switching button of the control function of the asynchronous and synchronous power grid direct current power modulation function is switched on, if the stability control device sends a large-area networking mode signal to the flexible direct current control system according to the running state of the power grid, the direct current power modulation controller is selected as follows:
the direct current measuring system measures and calculates phase angle differences (phi 1-phi 2) at two sides of the direct current transmission system in real time, compares the phase angle differences with the system phase angle differences at two sides under the steady state condition to make differences, calculates and obtains direct current power modulation quantity through a P control link, a limiting limit and other control links, and superimposes the direct current power modulation quantity on a direct current power reference value to automatically adjust the actual running power of the flexible direct current.
In fig. 2, phase angles phi 1 and phi 2 on two sides of the back-to-back flexible and straight system are obtained by adopting an algorithm similar to a PMU, phi 0 is a system phase angle difference on two sides under a steady state condition (power on two sides are respectively in a balanced state, power exchange on east and west and power on each alternating current/direct current connecting line are in a steady state), and delta P is flexible and straight modulation power output by a controller.
(4) After the 'asynchronous and synchronous power grid direct current power modulation function' is put into, the FLC function of the flexible direct current unit is automatically shielded.
(5) If the stabilizing control device acts in the direct current operation, a stabilizing control priority principle is adopted, the abnormal synchronous power grid direct current power modulation function is exited after the stabilizing control action, meanwhile, the abnormal synchronous power grid direct current power modulation function (the abnormal synchronous power grid direct current power modulation function is not exited) is controlled by a pressing plate, the HMI interface manually resets the stabilizing control action alarm signal and enables the abnormal synchronous power grid direct current power modulation function again after 3 seconds of delay.
(6) And when the operator exits the button of the control function of the asynchronous power grid direct current power modulation function, the controller of the asynchronous power grid direct current power modulation function fails, and the output of the controller is 0.
Based on the same inventive concept, the embodiment of the application also provides a direct current power modulation system suitable for a different synchronous power grid, which comprises:
a dc power modulation controller for performing:
if the stability control device sends a partition asynchronous mode signal to the flexible direct current control system according to the running state of the power grid, the partition asynchronous mode signal is used for controlling a direct current power modulation controller to generate a first direct current power modulation quantity, the first direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted;
and if the stability control device sends a large-area networking mode signal to the flexible direct current control system according to the running state of the power grid, the large-area networking mode signal is used for controlling the direct current power modulation controller to generate a second direct current power modulation quantity, the second direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted.
In some embodiments, the method for generating the first dc power modulation amount includes:
the direct current measurement system measures and calculates the frequencies f1 and f2 at two sides of the direct current transmission system in real time to obtain delta f1 and delta f2;
and delta f1 and delta f2 are used as input of an asynchronous power grid frequency synchronous operation controller, and after filtering, blocking, PI control and amplitude limiting control links, the first direct current power modulation quantity is calculated, wherein delta f1 and delta f2 are differences between the frequencies f1 and f2 at two sides of the back-to-back converter station and the rated frequency.
In some embodiments, the method for generating the second dc power modulation amount includes:
the direct current measuring system measures and calculates phase angle differences phi 1-phi 2 at two sides of the direct current transmission system in real time, compares the phase angle differences with the phase angle differences of the direct current transmission systems at two sides under the steady state condition, and calculates a second direct current power modulation quantity through a P control link and a limiting control link.
In some embodiments, before sending the "partition asynchronous mode" signal and the "large area networking mode" signal, further comprising:
the operation interface of the operator is provided with a switching button of a control function of a direct current power modulation function of the asynchronous power grid, and the operator performs manual switching operation on the functions of sending a signal of a zoning asynchronous mode and a signal of a large-area networking mode through the switching button.
In some embodiments, after the "asynchronous and synchronous power grid direct current power modulation function" is put into, the FLC function of the flexible direct current unit is automatically shielded.
In some embodiments, when the stabilizing device acts during the dc operation, the stabilizing device exits the "out-of-step power grid dc power modulation function" after acting.
In some embodiments, when the operator exits the button of the control function of the "abnormal synchronous power grid dc power modulation function", the abnormal synchronous power grid dc power modulation function controller fails, and the controller output is 0.
Because the system is a system corresponding to the direct current power modulation method suitable for the asynchronous and synchronous power grid in the embodiment of the application, and the principle of solving the problem of the system is similar to that of the method, the implementation of the system can refer to the implementation process of the embodiment of the method, and the repetition is omitted.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
The above embodiments are only for illustrating the technical concept and features of the present application, and are intended to enable those skilled in the art to understand the content of the present application and implement the same, and are not intended to limit the scope of the present application. All equivalent changes or modifications made in accordance with the essence of the present application are intended to be included within the scope of the present application.
Claims (10)
1. A method of dc power modulation adapted to a heterosynchronous power grid, comprising:
if the stability control device sends a partition asynchronous mode signal to the flexible direct current control system according to the running state of the power grid, the partition asynchronous mode signal is used for controlling a direct current power modulation controller to generate a first direct current power modulation quantity, the first direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted;
and if the stability control device sends a large-area networking mode signal to the flexible direct current control system according to the running state of the power grid, the large-area networking mode signal is used for controlling the direct current power modulation controller to generate a second direct current power modulation quantity, the second direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted.
2. The method for generating the first dc power modulation amount according to claim 1, wherein the specific method is as follows:
the direct current measurement system measures and calculates the frequencies f1 and f2 at two sides of the direct current transmission system in real time to obtain delta f1 and delta f2;
and delta f1 and delta f2 are used as input of an asynchronous power grid frequency synchronous operation controller, and after filtering, blocking, PI control and amplitude limiting control links, the first direct current power modulation quantity is calculated, wherein delta f1 and delta f2 are differences between the frequencies f1 and f2 at two sides of the back-to-back converter station and the rated frequency.
3. The method for generating the second dc power modulation amount according to claim 1, wherein the specific method is as follows:
the direct current measuring system measures and calculates phase angle differences phi 1-phi 2 at two sides of the direct current transmission system in real time, compares the phase angle differences with the phase angle differences of the direct current transmission systems at two sides under the steady state condition, and calculates a second direct current power modulation quantity through a P control link and a limiting control link.
4. The method for dc power modulation for an asynchronous and synchronous power network according to claim 1, further comprising, before transmitting the "zoned asynchronous mode" signal and the "zoned networking mode" signal:
the operation interface of the operator is provided with a switching button of a control function of a direct current power modulation function of the asynchronous power grid, and the operator performs manual switching operation on the functions of sending a signal of a zoning asynchronous mode and a signal of a large-area networking mode through the switching button.
5. The method for modulating dc power adapted to a heterogeneous power grid according to claim 4, wherein the FLC function of the flexible dc unit is automatically shielded after the function of modulating dc power of the heterogeneous power grid is put into operation.
6. The method for dc power modulation adapted to a heterosynchronous power grid according to claim 5, wherein when the steady control device is operated during dc operation, the steady control device is operated and then exits the heterosynchronous power grid dc power modulation function.
7. The method for dc power modulation adapted to a heterogeneous power grid according to claim 5, wherein when the operator exits the button of the control function of "heterogeneous power grid dc power modulation function", the controller of the heterogeneous power grid dc power modulation function fails, and the controller output is 0.
8. A direct current power modulation system adapted to a heterosynchronous power grid, comprising:
a dc power modulation controller for performing:
if the stability control device sends a partition asynchronous mode signal to the flexible direct current control system according to the running state of the power grid, the partition asynchronous mode signal is used for controlling a direct current power modulation controller to generate a first direct current power modulation quantity, the first direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted;
and if the stability control device sends a large-area networking mode signal to the flexible direct current control system according to the running state of the power grid, the large-area networking mode signal is used for controlling the direct current power modulation controller to generate a second direct current power modulation quantity, the second direct current power modulation quantity is superimposed on a direct current power reference value, and the actual running power of the flexible direct current control system is automatically adjusted.
9. The dc power modulation system for a heterosynchronous power grid according to claim 8, wherein the generating the first dc power modulation amount comprises:
the direct current measurement system measures and calculates the frequencies f1 and f2 at two sides of the direct current transmission system in real time to obtain delta f1 and delta f2;
and delta f1 and delta f2 are used as input of an asynchronous power grid frequency synchronous operation controller, and after filtering, blocking, PI control and amplitude limiting control links, the first direct current power modulation quantity is calculated, wherein delta f1 and delta f2 are differences between the frequencies f1 and f2 at two sides of the back-to-back converter station and the rated frequency.
10. The dc power modulation system for a heterosynchronous power grid according to claim 8, wherein the generating the second dc power modulation amount comprises:
the direct current measuring system measures and calculates phase angle differences phi 1-phi 2 at two sides of the direct current transmission system in real time, compares the phase angle differences with the phase angle differences of the direct current transmission systems at two sides under the steady state condition, and calculates a second direct current power modulation quantity through a P control link and a limiting control link.
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| CN202310661713.1A CN116885680A (en) | 2023-06-06 | 2023-06-06 | Direct current power modulation method and system suitable for asynchronous and synchronous power grid |
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| CN202310661713.1A CN116885680A (en) | 2023-06-06 | 2023-06-06 | Direct current power modulation method and system suitable for asynchronous and synchronous power grid |
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