CN117458516A - Reactive power PI regulating method adopting voltage analog quantity setting - Google Patents
Reactive power PI regulating method adopting voltage analog quantity setting Download PDFInfo
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- CN117458516A CN117458516A CN202311275389.6A CN202311275389A CN117458516A CN 117458516 A CN117458516 A CN 117458516A CN 202311275389 A CN202311275389 A CN 202311275389A CN 117458516 A CN117458516 A CN 117458516A
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- voltage
- vset
- reactive power
- module
- excitation
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- 230000001105 regulatory effect Effects 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 15
- 230000005284 excitation Effects 0.000 claims abstract description 50
- 238000012544 monitoring process Methods 0.000 claims abstract description 19
- 238000006243 chemical reaction Methods 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims description 2
- 230000003111 delayed effect Effects 0.000 claims 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/10—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load
- H02P9/102—Control effected upon generator excitation circuit to reduce harmful effects of overloads or transients, e.g. sudden application of load, sudden removal of load, sudden change of load for limiting effects of transients
Abstract
A reactive power PI regulating method adopting voltage analog quantity setting comprises S1, a reactive power sampling filter module 1 inputs a reactive power Q filter treatment to a PI regulating module 2; s2, the PI regulating module 2 performs PI calculation by using the reactive power setting Qset and the filtered reactive power P to obtain a power given gain delta Qset; adjusting the rate and overshoot of power adjustment by setting a proportionality coefficient Kp and an integral time constant Ti; s3, the reactive gain-exciting voltage gain conversion module 3 converts a power given gain delta Qset into an exciting voltage given gain delta Vset, and the conversion formula is as follows: δvset=δqset/K; the invention is used for solving the problems that the regulation speed of the monitoring system is slow and the regulation is easy to overshoot due to the adoption of simple proportional regulation (P regulation) under the voltage mode of the excitation regulator, and the problems that the monitoring system cannot diagnose the relay fault in time and cut the monitoring system to reactive open loop through the output and the receiving of the relay by pulse regulation.
Description
Technical Field
The invention relates to a reactive power PI regulating method adopting voltage analog quantity setting;
background
In the process of reactive power regulation of a hydropower station unit, as shown in fig. 1, when the excitation regulator is in a voltage mode and the monitoring system is in a reactive closed loop mode, the monitoring system calculates the pulse duration time and the pulse interval time of increasing/decreasing the excitation voltage by adopting simple proportional regulation (P regulation), and the excitation voltage setting of the excitation regulator is regulated through pulse output. Because the reactive power regulation has larger inertia, when one regulation pulse is sent out, the next regulation pulse is needed to be sent out after the power is regulated in place, so that the time for regulating and increasing the power in place is longer, and if the parameter is not regulated in place, larger overshoot is also generated. The method is characterized in that 2 relays are arranged on the monitoring system side and the speed regulating system side respectively, in the reactive power regulation process, the relays act frequently, if the relays are damaged, the monitoring system cannot judge and can not timely switch to a reactive power open loop mode, and reactive power regulation is not in place or is not carried out by mistake.
Disclosure of Invention
The invention aims to solve the technical problems of slow regulation rate and easy overshoot caused by simple proportional regulation (P regulation) of an excitation regulator in a voltage mode and incapability of timely diagnosing relay faults and cutting the monitoring system to a reactive open loop by outputting and receiving through a relay through pulse regulation by the monitoring system.
In order to solve the problems, the technical scheme of the invention is as follows:
the reactive power PI regulating method adopting voltage analog quantity setting comprises a regulating device, wherein the regulating device comprises a reactive sampling filter module, a PI regulating module, a reactive gain-exciting voltage gain conversion module, an exciting voltage setting calculation module, an exciting voltage output module and a fault judging and processing module, and the method comprises the following steps:
s1, a reactive power sampling filter module filters reactive power Q and inputs the filtered reactive power Q into a PI regulating module;
s2, the PI regulating module performs PI calculation by using the reactive power setting Qset and the filtered reactive power P to obtain a power given gain delta Qset; adjusting the rate and overshoot of power adjustment by setting a proportionality coefficient Kp and an integral time constant Ti;
s3, a reactive gain-exciting voltage gain conversion module converts a power given gain delta Qset into an exciting voltage given gain delta Vset, wherein the conversion formula is as follows: δvset=δqset/K;
s4, the excitation voltage given calculation module calculates an excitation voltage given Vset through an initial excitation voltage given Vset (0) and an excitation voltage given gain delta Vset, wherein the calculation formula is as follows: vset=vset (0) +Σ (n＝1)^n δvset (n), where δvset (n) represents the excitation voltage given gain δvset calculated for the nth cycle; when the excitation regulator is not in a voltage mode or the monitoring system is not in a closed-loop mode, the excitation voltage setting Vset tracks the actual excitation voltage V, and when the excitation regulator is in the voltage mode and the monitoring system is in the closed-loop mode, the actual excitation voltage V is assigned to the Vset (0) at the moment of meeting the requirement;
s5, an excitation voltage output module converts an excitation voltage given Vset (engineering value) into a Vset (source code value) and then sends the Vset (source code value) to an excitation regulator through an analog quantity output module;
and S6, the fault judging and processing module compares the exciting voltage setting Vset with an exciting voltage setting feedback Vset of the excitation regulator received by the local control unit PLC, and when the deviation of the exciting voltage setting Vset and the exciting voltage setting feedback Vset exceeds a limit value, the closed-loop mode of the monitoring system is switched into a voltage mode by delaying, the PI regulating module stops calculation, and the exciting voltage setting Vset tracks the actual exciting voltage V.
The beneficial effects of the invention are as follows:
the reactive power regulation rate and the regulation precision of the hydroelectric generating set under the voltage mode are increased, the damage of the output and receiving pulse relay is avoided, the monitoring system cannot judge, and the reactive power can not be switched to the reactive power open loop mode in time, so that the problem that reactive power regulation is not in place or is erroneously regulated is solved.
Drawings
The invention is further described with reference to the accompanying drawings:
FIG. 1 is a flow chart of operation in conventional reactive power PI regulation;
FIG. 2 is a workflow diagram of the present invention;
Detailed Description
A reactive power PI regulating method adopting voltage analog quantity setting is shown in fig. 2, and comprises a reactive sampling filter module 1, a PI regulating module 2, a reactive gain-exciting voltage gain converting module 3, an exciting voltage setting calculating module 4, an exciting voltage output module 5 and a fault judging and processing module 6.
Data sources: reactive power setting Qset is set by AVC or an operator station, reactive power P is output by a reactive power transmitter acquired by a local control unit PLC, and excitation voltage feedback is generated by a voltage measurement module of an excitation regulator.
The method comprises the following steps:
s1, the reactive power sampling filter module 1 carries out reactive power Q filter processing and then inputs the reactive power Q filter processing into the PI regulating module 2.
And S2, the PI regulating module 2 performs PI calculation by using the reactive power setting Qset and the filtered reactive power P to obtain a power given gain delta Qset. The PI regulation module is executed once every program period, and no regulation dead zone exists. The proportionality coefficient Kp and the integration time constant Ti can be set by parameters, and the rate and overshoot of the power regulation can be regulated by setting Kp and Ti.
S3, reactive gain- & gt excitation voltage gain conversion module 3 converts power given gain delta Qset into excitation voltage given gain delta Vset, wherein the formula is as follows: δvset=δqset/K, where K is a conversion coefficient;
s4, the excitation voltage given calculation module 4 calculates the excitation voltage given Vset through an initial excitation voltage given Vset (0) and an excitation voltage given gain delta Vset, wherein the calculation formula is as follows: vset=vset (0) +Σ (n＝1)^n δVset(n)，Where δvset (n) represents the excitation voltage given gain δvset calculated for the nth period. The set Vset tracks the actual excitation voltage V when the excitation regulator is not in voltage mode or the monitoring system is not in closed loop mode, and assigns the actual excitation voltage V to Vset (0) at the instant that the excitation regulator is in voltage mode and the monitoring system is in closed loop mode while satisfied.
S5, the exciting voltage output module 5 converts the exciting voltage given Vset (engineering value) into Vset (source code value) and sends the Vset (source code value) to the exciting regulator through the analog quantity output module.
And S6, the fault judging and processing module 6 compares the exciting voltage setting Vset with the exciting voltage setting feedback Vset of the excitation regulator received by the local control unit PLC, and when the deviation of the exciting voltage setting Vset and the exciting voltage setting feedback Vset exceeds a limit value, the closed-loop mode of the monitoring system is switched into a voltage mode by delaying, the PI regulating module stops calculation, and the exciting voltage setting Vset tracks the actual exciting voltage V.
Claims (3)
1. A reactive power PI regulating method adopting voltage analog quantity setting is characterized in that: the method comprises the following steps of:
s1, a reactive power sampling filter module (1) filters reactive power Q and inputs the filtered reactive power Q into a PI regulating module (2);
s2, a PI regulating module (2) performs PI calculation by using reactive power setting Qset and filtered reactive power P to obtain a power given gain delta Qset; adjusting the rate and overshoot of power adjustment by setting a proportionality coefficient Kp and an integral time constant Ti;
s3, a reactive gain-exciting voltage gain conversion module (3) converts a power given gain delta Qset into an exciting voltage given gain delta Vset, wherein the conversion formula is as follows: δvset=δqset/K;
s4, the excitation voltage given calculation module (4) calculates the excitation voltage given by the initial excitation voltage given Vset (0) and the excitation voltage given gain delta VsetVset, the calculation formula is: vset=vset (0) +Σ (n＝1)^n δvset (n), where δvset (n) represents the excitation voltage given gain δvset calculated for the nth cycle; when the excitation regulator is not in a voltage mode or the monitoring system is not in a closed-loop mode, the excitation voltage setting Vset tracks the actual excitation voltage V, and when the excitation regulator is in the voltage mode and the monitoring system is in the closed-loop mode, the actual excitation voltage V is assigned to the Vset (0) at the moment of meeting the requirement;
s5, an excitation voltage output module (5) converts an excitation voltage given Vset (engineering value) into a Vset (source code value) and then sends the Vset (source code value) to an excitation regulator through an analog quantity output module;
and S6, the fault judging and processing module (6) compares the exciting voltage setting Vset with the exciting voltage setting feedback Vset of the excitation regulator received by the local control unit PLC, and when the deviation of the exciting voltage setting Vset and the exciting voltage setting feedback Vset exceeds a limit value, the monitoring system closed-loop mode is delayed to be switched into a voltage mode, the PI regulating module stops calculation, and the exciting voltage setting Vset tracks the actual exciting voltage V.
2. A reactive power PI regulation method using voltage analog quantity according to claim 1, characterized in that: reactive power setting Qset is set by AVC or an operator station, reactive power P is output by a reactive power transmitter acquired by a local control unit PLC, and excitation voltage feedback is generated by a voltage measurement module of an excitation regulator.
3. A reactive power PI regulation method using voltage analog quantity according to claim 1, characterized in that: the PI regulation module is executed once every program period, and no regulation dead zone exists.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311275389.6A CN117458516A (en) | 2023-09-28 | 2023-09-28 | Reactive power PI regulating method adopting voltage analog quantity setting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311275389.6A CN117458516A (en) | 2023-09-28 | 2023-09-28 | Reactive power PI regulating method adopting voltage analog quantity setting |
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| Publication Number | Publication Date |
|---|---|
| CN117458516A true CN117458516A (en) | 2024-01-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202311275389.6A Pending CN117458516A (en) | 2023-09-28 | 2023-09-28 | Reactive power PI regulating method adopting voltage analog quantity setting |
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2023
- 2023-09-28 CN CN202311275389.6A patent/CN117458516A/en active Pending
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