CN113162074A - Flexible direct system high-frequency oscillation control method and system for fault current control - Google Patents
Flexible direct system high-frequency oscillation control method and system for fault current control Download PDFInfo
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Abstract
The invention relates to a high-frequency oscillation control method and a system of a flexible direct system for fault current control, which comprises the following steps: a voltage signal generation link is adopted to obtain a second reference signal of the d-axis voltage; a current deviation control link is adopted to obtain a third current deviation signal; calculating to obtain a d-axis voltage third reference signal according to the d-axis voltage second reference signal, the third current deviation signal and a voltage target value at an access point of the flexible-direct current converter station acquired in advance; and carrying out abc/dq conversion processing on the third voltage reference signal to obtain a three-phase reference voltage of the flexible-direct current converter, so as to realize high-frequency oscillation control of the flexible-direct current system. The invention has higher flexibility and reliability and can adapt to the high-frequency oscillation control of the flexible direct current controller with different dynamic response requirements.
Description
Technical Field
The invention relates to the technical field of stability control of power systems, in particular to a high-frequency oscillation control method and system of a flexible direct current system for fault current control.
Background
The application of power electronic equipment in a direct current transmission system is wide, and with the introduction of a large number of power electronic equipment, the problem of high-frequency oscillation related to controller delay is gradually highlighted. According to previous researches, the flexible direct current converter based on the power electronic equipment has a high-frequency oscillation risk when being connected to an alternating current system or a new energy station, and in order to solve the high-frequency oscillation problem existing in the flexible direct current converter access system, a control method is started, an advanced control strategy of the flexible direct current converter which does not depend on external impedance characteristics is researched, and the high-frequency oscillation problem is fundamentally solved. The existing control method mostly aims at the impedance characteristic of the flexible-direct current converter in the steady state, often ignores the controller characteristic in the transient state, and seriously influences the dynamic characteristic of the high-frequency oscillation controller under the fault condition.
Disclosure of Invention
In view of the above problems, it is an object of the present invention to provide a method and a system for controlling high frequency oscillation of a soft dc controller for fault current control, which can adapt to high frequency oscillation control of soft dc controllers with different dynamic response requirements.
In order to achieve the purpose, the invention adopts the following technical scheme: a method of soft direct system high frequency oscillation control for fault current control, comprising: step 1, obtaining a second reference signal of d-axis voltage by adopting a voltage signal generation link
Step 2, obtaining a third current deviation signal by adopting a current deviation control link
Step 3, according to the d-axis voltage, a second reference signal
Third current deviation signal
And beforehand obtainTaking a voltage target value u at an access point of a flexible direct current converter stationrefAnd calculating to obtain a third reference signal of the d-axis voltage
Step 4, third reference signal of voltage
And performing abc/dq conversion processing to obtain three-phase reference voltage of the flexible-direct current converter, and realizing high-frequency oscillation control of the flexible-direct current system.
Further, in step 1, the voltage signal generation unit includes the following steps:
step 1.1, calculating to obtain a voltage effective value u of the access point of the flexible-direct current converter according to a three-phase voltage signal at the access point of the flexible-direct current converter station obtained in advancerms；
Step 1.2, according to the voltage target value u of the access point of the flexible direct current converter station acquired in advancerefAnd the effective value u of the access point voltagermsObtaining a second reference signal of the d-axis voltage after being processed by a high-frequency oscillation control link
Further, in step 1.1, the effective voltage value urmsThe calculation method comprises the following steps:
in the formula (I), the compound is shown in the specification,
calculating an input value, v, for the voltage effective valueab、vbc、vcaA phase voltage signals vaAnd b phase voltage signal vbThe difference value after subtraction, b phase voltage signal vbAnd c-phase voltage signal vcThe difference after subtraction, c phase voltage signal vcVoltage signal v of phase aaA subtracted difference value; t is1Is a baseWave period, t is a time variable; u is a voltage integral variable.
Further, in step 1.2, a voltage target value u at an access point of the flexible direct current converter station is obtained in advancerefWith the effective value u of the access point voltagermsObtaining a first reference signal of the d-axis voltage by difference
The d-axis voltage is converted into a first reference signal
After being processed by a high-frequency oscillation control link G (x), a second reference signal of the d-axis voltage is obtained
Further, the equation of the high-frequency oscillation control link is as follows:
wherein, y (t) and x (t) are respectively the input and output of the function of the high-frequency oscillation control link G (x); n represents a high-frequency oscillation control coefficient;
meaning that the rounding is done down,
represents rounding up; n + represents a positive integer set.
Further, in the step 2, in the current deviation control link, if the d-axis current i of the access point is detecteddFirst signal less than d-axis current deviation
Time, current deviation third signal
Is 0; when the d-axis of the access point is onStream idFirst signal greater than d-axis current deviation
Time, current deviation third signal
Comprises the following steps:
in the formula, Gi(s) transfer function for current deviation control PI controller, KpIs a proportional gain coefficient, TiIs an integral gain time constant;
is a current clipping constant; s is the laplace operator.
Further, in the step 3, a third reference signal of the d-axis voltage
The calculation formula of (2) is as follows:
further, in step 4, abc/dq is converted into:
in the formula, thetasAt fundamental frequency f for a soft-straight controllersA generated phase angle, where t is a time constant;
respectively are a-phase reference voltage, b-phase reference voltage and c-phase reference voltage of the flexible-direct current converter; u. ofqValues are taken for the q-axis voltage reference signal.
A limp-home system high frequency oscillation control system for fault current control, comprising: the device comprises a voltage signal generation module, a current deviation control module, a voltage third reference signal calculation module and an abc/dq conversion module;
the voltage signal generation module adopts a voltage signal generation link to obtain a second reference signal of the d-axis voltage
The current deviation control module adopts a current deviation control link to obtain a third current deviation signal
The voltage third reference signal calculation module is used for calculating a second reference signal according to the d-axis voltage
Third current deviation signal
And a pre-obtained voltage target value u at the access point of the flexible direct current converter stationrefAnd calculating to obtain a third reference signal of the d-axis voltage
The abc/dq conversion module converts the third reference signal
Performing abc/dq conversion to obtain three-phase reference voltage of the flexible-direct current converter, and realizing high-frequency conversion of the flexible-direct current systemAnd (5) oscillation control.
Further, the voltage signal generation module comprises a voltage effective value calculation module and a high-frequency oscillation control module;
the voltage effective value calculating module calculates to obtain the voltage effective value u of the access point of the flexible-direct current converter according to the three-phase voltage signals at the access point of the flexible-direct current converter stationrms；
The high-frequency oscillation control module is used for acquiring a voltage target value u at an access point of the flexible direct current converter station in advancerefAnd the effective value u of the access point voltagermsObtaining a second reference signal of the d-axis voltage after being processed by a high-frequency oscillation control link
Due to the adoption of the technical scheme, the invention has the following advantages: the fault ride-through function of the high-frequency oscillation controller is realized by adding current deviation control in a control link, and the high-frequency oscillation controller has higher flexibility and reliability compared with the traditional high-frequency oscillation controller and can adapt to the high-frequency oscillation control of the flexible direct-current controller with different dynamic response requirements.
Drawings
FIG. 1 is a schematic flow chart of the overall method in the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
In a first embodiment of the present invention, as shown in fig. 1, there is provided a method for controlling high-frequency oscillation of a limp-home system for fault current control, comprising the steps of:
step 1, generating by adopting voltage signalsForming a link to obtain a second reference signal of d-axis voltage
In this embodiment, the voltage signal generating unit includes the following steps:
step 1.1, calculating to obtain a voltage effective value u of the access point of the flexible-direct current converter according to a three-phase voltage signal at the access point of the flexible-direct current converter station obtained in advancerms；
The method specifically comprises the following steps: effective value of voltage urmsThe calculation method comprises the following steps:
in the formula (I), the compound is shown in the specification,
calculating an input value, v, for the voltage effective valueab、vbc、vcaA phase voltage signals vaAnd b phase voltage signal vbThe difference value after subtraction, b phase voltage signal vbAnd c-phase voltage signal vcThe difference after subtraction, c phase voltage signal vcVoltage signal v of phase aaA subtracted difference value; t is1And t is a time variable and u is a voltage integral variable.
Step 1.2, according to the voltage target value u of the access point of the flexible direct current converter station acquired in advancerefAnd the effective value u of the access point voltagermsObtaining a second reference signal of the d-axis voltage after being processed by a high-frequency oscillation control link
The method specifically comprises the following steps: obtaining a voltage target value u at an access point of the flexible direct current converter station in advancerefWith the effective value u of the access point voltagermsObtaining a first reference signal of the d-axis voltage by difference
The d-axis voltage is converted into a first reference signal
After being processed by a high-frequency oscillation control link G (x), a second reference signal of the d-axis voltage is obtained
The equation of the high-frequency oscillation control link is as follows:
wherein y (t), x (t) are input and output of the high-frequency oscillation control unit G (x) function respectively, and the d-axis voltage first reference signal
For the input of a high-frequency oscillation control link, both
d-axis voltage second reference signal
For controlling the output of the link by high-frequency oscillation, i.e.
n represents a high-frequency oscillation control coefficient, and when the value of n is larger, the high-frequency oscillation control effect is weaker, and vice versa;
the notation means that the rounding is done down,
the symbol represents rounding up; n + represents a positive integer set.
Step 2, obtaining a third current deviation signal by adopting a current deviation control link
In this embodiment, the current deviation control link is mainly responsible for controlling the over-current phenomenon under the fault condition or the large system disturbance, so that under the normal operation condition, the d-axis current i of the access point is connecteddFirst signal smaller than d-axis current deviation
Time, current deviation third signal
Is 0; when the d-axis current i is connected to the pointdGreater than d-axis current deviation first signal
Time, current deviation third signal
Comprises the following steps:
in the formula, Gi(s) transfer function for current deviation control PI controller, KpIs a proportional gain coefficient, TiIs an integral gain time constant;
is a current clipping constant; s is the laplace operator.
Step 3, according to the d-axis voltage, a second reference signal
Third current deviation signal
And a pre-obtained voltage target value u at the access point of the flexible direct current converter stationrefAnd calculating to obtain a third reference signal of the d-axis voltage
In this embodiment, the d-axis voltage third reference signal
The calculation formula of (2) is as follows:
step 4, third reference signal of voltage
Performing abc/dq conversion processing to obtain three-phase reference voltage of the flexible-direct current converter, and realizing high-frequency oscillation control of a flexible-direct current system;
in this embodiment, the reference signal value u is obtained due to the q-axis voltageqThe voltage is 0, and after abc/dq conversion, a phase reference voltage of a flexible-direct current converter is obtained
Reference voltage of phase b
c phase reference voltage
abc/dq transformation:
in the formula, thetasAt fundamental frequency f for a soft-straight controllersThe resulting phase angle, where t is the time constant.
In a second embodiment of the invention, a flexible direct system high-frequency oscillation control system for fault current control is provided, which comprises a voltage signal generation module, a current deviation control module, a voltage third reference signal calculation module and an abc/dq conversion module;
a voltage signal generation module for obtaining a second reference signal of d-axis voltage by using the voltage signal generation link
A current deviation control module for obtaining a third current deviation signal by adopting a current deviation control link
A third reference signal calculating module for calculating a second reference signal according to the d-axis voltage
Third current deviation signal
And a pre-obtained voltage target value u at the access point of the flexible direct current converter stationrefAnd calculating to obtain a third reference signal of the d-axis voltage
an abc/dq conversion module for converting the voltage into a third reference signal
And performing abc/dq conversion processing to obtain three-phase reference voltage of the flexible-direct current converter, and realizing high-frequency oscillation control of the flexible-direct current system.
In the above embodiment, the voltage signal generating module includes a voltage effective value calculating module and a high-frequency oscillation control module;
the voltage effective value calculation module is used for calculating to obtain a voltage effective value u of the access point of the flexible-direct current converter according to a three-phase voltage signal at the access point of the flexible-direct current converter station acquired in advancerms；
A high-frequency oscillation control module for controlling the high-frequency oscillation according to a pre-acquired voltage target value u at the access point of the flexible direct current converter stationrefAnd the effective value u of the access point voltagermsObtaining a second reference signal of the d-axis voltage after being processed by a high-frequency oscillation control link
In conclusion, the fault ride-through function of the high-frequency oscillation controller is realized by adding current deviation control in the control link, and the fault ride-through function has higher flexibility and reliability compared with the traditional high-frequency oscillation controller.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Claims (10)
1. A method for controlling high frequency oscillation of a flexible direct current system for fault current control, comprising:
step 1, obtaining a second reference signal of d-axis voltage by adopting a voltage signal generation link
Step 2, obtaining a third current deviation signal by adopting a current deviation control link
Step 3, according to the d-axis voltage, a second reference signal
Third current deviation signal
And a pre-obtained voltage target value u at the access point of the flexible direct current converter stationrefMeter for measuringCalculating to obtain a third reference signal of d-axis voltage
Step 4, third reference signal of voltage
And performing abc/dq conversion processing to obtain three-phase reference voltage of the flexible-direct current converter, and realizing high-frequency oscillation control of the flexible-direct current system.
2. The control method according to claim 1, wherein in step 1, the voltage signal generation section comprises the steps of:
step 1.1, calculating to obtain a voltage effective value u of the access point of the flexible-direct current converter according to a three-phase voltage signal at the access point of the flexible-direct current converter station obtained in advancerms；
Step 1.2, according to the voltage target value u of the access point of the flexible direct current converter station acquired in advancerefAnd the effective value u of the access point voltagermsObtaining a second reference signal of the d-axis voltage after being processed by a high-frequency oscillation control link
3. Control method according to claim 2, characterized in that in step 1.1, the effective value of the voltage urmsThe calculation method comprises the following steps:
in the formula (I), the compound is shown in the specification,
calculating an input value, v, for the voltage effective valueab、vbc、vcaA phase voltage signals vaAnd b phase voltage signal vbThe difference value after subtraction, b phase voltage signal vbAnd c-phase voltage signal vcThe difference after subtraction, c phase voltage signal vcVoltage signal v of phase aaA subtracted difference value; t is1Is the fundamental wave period, and t is a time variable; u is a voltage integral variable.
4. A control method according to claim 2, characterized in that in step 1.2, a pre-obtained target value u of the voltage at the access point of the flexible direct current converter station is usedrefWith the effective value u of the access point voltagermsObtaining a first reference signal of the d-axis voltage by difference
The d-axis voltage is converted into a first reference signal
After being processed by a high-frequency oscillation control link G (x), a second reference signal of the d-axis voltage is obtained
5. The control method according to claim 4, wherein the equation of the high frequency oscillation control element is:
wherein, y (t) and x (t) are respectively the input and output of the function of the high-frequency oscillation control link G (x); n represents a high-frequency oscillation control coefficient;
meaning that the rounding is done down,
represents rounding up; n + represents a positive integer set.
6. The control method of claim 1, wherein in step 2, if the d-axis current i of the access point is in the current deviation control loopdFirst signal less than d-axis current deviation
Time, current deviation third signal
Is 0; when the d-axis current i is connected to the pointdFirst signal greater than d-axis current deviation
Time, current deviation third signal
Comprises the following steps:
in the formula, Gi(s) transfer function for current deviation control PI controller, KpIs a proportional gain coefficient, TiIs an integral gain time constant;
is a current clipping constant; s is the laplace operator.
7. The control method of claim 1, wherein in step 3, the d-axis voltage is a third reference signal
The calculation formula of (2) is as follows:
8. the control method according to claim 1, wherein in step 4, abc/dq is converted into:
in the formula, thetasAt fundamental frequency f for a soft-straight controllersA generated phase angle, where t is a time constant;
respectively are a-phase reference voltage, b-phase reference voltage and c-phase reference voltage of the flexible-direct current converter; u. ofqValues are taken for the q-axis voltage reference signal.
9. A high frequency oscillation control system for a limp-home system for fault current control, comprising: the device comprises a voltage signal generation module, a current deviation control module, a voltage third reference signal calculation module and an abc/dq conversion module;
the voltage signal generation module adopts a voltage signal generation link to obtain a second reference signal of the d-axis voltage
The current deviation control module adopts a current deviation control link to obtain a third current deviation signal
The voltage third reference signal calculation module is used for calculating a second reference signal according to the d-axis voltage
Third current deviation signal
And a pre-obtained voltage target value u at the access point of the flexible direct current converter stationrefAnd calculating to obtain a third reference signal of the d-axis voltage
The abc/dq conversion module converts the third reference signal
And performing abc/dq conversion processing to obtain three-phase reference voltage of the flexible-direct current converter, and realizing high-frequency oscillation control of the flexible-direct current system.
10. The control system of claim 9, wherein the voltage signal generating module comprises a voltage effective value calculating module and a high-frequency oscillation control module;
the voltage effective value calculating module calculates to obtain the voltage effective value u of the access point of the flexible-direct current converter according to the three-phase voltage signals at the access point of the flexible-direct current converter stationrms；
The high-frequency oscillation control module is used for acquiring a voltage target value u at an access point of the flexible direct current converter station in advancerefAnd the effective value u of the access point voltagermsObtaining a second reference signal of the d-axis voltage after being processed by a high-frequency oscillation control link
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