CN105743134B - It is adaptive quickly to adjust photovoltaic AVC control methods - Google Patents
It is adaptive quickly to adjust photovoltaic AVC control methods Download PDFInfo
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- CN105743134B CN105743134B CN201610216462.6A CN201610216462A CN105743134B CN 105743134 B CN105743134 B CN 105743134B CN 201610216462 A CN201610216462 A CN 201610216462A CN 105743134 B CN105743134 B CN 105743134B
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/50—Controlling the sharing of the out-of-phase component
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a kind of adaptive quickly adjusting photovoltaic AVC control methods, include the following steps, step 1, receive the voltage-target of dispatching down distributing；Step 2, photovoltaic plant real time information value is obtained；Step 3, the system impedance of photovoltaic plant is calculated；Step 4, voltage-target is converted into reactive power desired value；Step 5, reactive power is carried out in inverter and reactive-load compensation equipment adjust distribution；Step 6, each inverter and reactive-load compensation equipment are issued a command under parallel；Step 7, it after waiting for a period of time, checks whether the voltage-target for reaching given, if reaching, terminates, if not up to, going to step 2.The present invention improves governing speed and precision, achievees the purpose that efficient voltage is adjusted by increasing reactive power adjustment factor, adjustment system impedance, the preferential inverter and transmitted in parallel instruction method for selecting to adjust high sensitivity.
Description
Technical Field
The invention relates to a self-adaptive photovoltaic AVC (Automatic Voltage Control) Control method capable of quickly adjusting, and belongs to the field of Automatic Voltage Control of photovoltaic power generation AVC (Automatic Voltage Control).
Background
At present, the state vigorously develops clean energy technology, and photovoltaic power generation is an important component. The photovoltaic power generation is characterized by regeneration and no pollution, the limitation is that the output fluctuates with the weather conditions, the impact on a power grid is large after the grid connection, and particularly, the large-scale centralized photovoltaic power station is more obvious. The photovoltaic power station should be adjustable and controllable, so that the safe operation of a power grid can be guaranteed, and therefore, the photovoltaic power station should be provided with a reactive voltage control system in a large-scale centralized manner and has voltage and reactive power control capability. According to the instruction of the power dispatching department, the photovoltaic power station automatically adjusts the reactive power emitted (absorbed) by the photovoltaic power station, and the voltage of the grid-connected point of the photovoltaic power station is controlled within a normal operation range.
At present, after a photovoltaic power station receives a voltage target issued by scheduling, an AVC control system generally converts the voltage target into a reactive power target, then distributes the reactive power to reactive power compensation equipment such as an inverter and SVG (scalable vector graphics) so as to achieve the purpose of adjusting the voltage of a grid connection point. When the voltage target and the reactive target are converted, a system impedance value is needed, the value can be set in advance, and after the system is adjusted for a certain number of times, the system can predict the system impedance participating in the next operation through a self-learning method according to the acquired information and data. If the value exceeds the predetermined value, the current common algorithm is to take the upper limit of the system impedance value. However, in a photovoltaic power station, a voltage acquisition value of a grid-connected point and a reactive power acquisition value of equipment such as an inverter and an SVG sometimes have a large time error, so that a calculated system impedance is large in difference from an actual value, a reactive power target is not accurately converted, the adjusting speed is influenced, and even the problem of adjusting oscillation can occur.
Although the regulation speed of the inverter and the SVG of the reactive power regulation equipment of the photovoltaic power station is high, the regulation speed is influenced due to the reasons of large quantity, delay in communication and the like, so that the AVC cannot complete a given regulation target within a specified time.
Disclosure of Invention
In order to solve the technical problem, the invention provides a self-adaptive photovoltaic AVC control method capable of quickly adjusting.
In order to achieve the purpose, the invention adopts the technical scheme that:
the adaptive photovoltaic AVC control method capable of quickly adjusting comprises the following steps,
step 1, receiving a voltage target value issued by scheduling;
step 2, acquiring a real-time information value of the photovoltaic power station;
step 3, calculating the system impedance of the photovoltaic power station;
if the system is used for the first time, the system impedance adopts a default value;
if historical data or real-time data exist, calculating a new system impedance value, recording a system impedance value with the highest adjustment sensitivity in the last period of time, and if the calculated system impedance value exceeds an upper limit, adopting the system impedance value with the highest adjustment sensitivity in the last period of time;
step 4, converting the voltage target value into a reactive power target value;
the reactive power target value = reactive power difference x reactive power adjustment coefficient;
wherein,
calculating the difference between the target voltage value and the actual voltage value, and converting the voltage difference value into a reactive power difference value by using the system impedance value;
setting a reactive power regulation coefficient according to the difference between the voltage target value and the actual voltage value;
step 5, adjusting and distributing reactive power in the inverter and the reactive compensation equipment;
during reactive power regulation and distribution, the inverter with high sensitivity is regulated preferentially;
step 6, issuing instructions to each inverter and reactive power compensation equipment in parallel;
and 7, after waiting for a period of time, checking whether the given voltage target value is reached, if so, finishing, and if not, turning to the step 2.
The photovoltaic power station real-time information value comprises photovoltaic power station booster station electric quantity, operation state information and electric quantity of an inverter, and operation state and electric quantity of reactive compensation equipment.
The reactive power adjusting coefficient can be adjusted according to the difference between the voltage target value and the actual voltage value, when the difference value is large, the reactive power adjusting coefficient is increased, and when the difference value is small, the reactive power adjusting coefficient is reduced.
And the reactive power regulating coefficient is less than or equal to 1.
The invention achieves the following beneficial effects: 1. according to the invention, by increasing the reactive power regulation coefficient, adjusting the system impedance, preferentially selecting the inverter with high regulation sensitivity and a parallel instruction sending method, the regulation speed and precision are improved, and the purpose of high-efficiency voltage regulation is achieved; 2. when the system impedance is out of limit, the target value of the reactive power is converted by recording and storing the previous system impedance value with the optimal adjusting effect, so that the accuracy of the system impedance is improved, and the adjusting speed can be accelerated; 3. the reactive power regulating coefficient is increased, the proportional coefficient is automatically adjusted according to the difference between the actual voltage value of the actual grid-connected point and the voltage target value, the regulation oscillation is prevented, and the regulation efficiency is improved; 4. during reactive power regulation and distribution, the inverter with high sensitivity is regulated preferentially, and the regulation speed and efficiency are improved; 5. and parallel communication is adopted, so that the instruction issuing speed is increased, and the adjusting speed is greatly improved.
Drawings
FIG. 1 is a flow chart of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, the adaptive fast photovoltaic AVC control method includes the following steps:
step 1, receiving a voltage target value issued by scheduling.
And 2, acquiring a real-time information value of the photovoltaic power station.
The photovoltaic power station real-time information value comprises photovoltaic power station booster station electric quantity, operation state information and electric quantity of an inverter, and operation state and electric quantity of reactive compensation equipment.
And 3, calculating the system impedance of the photovoltaic power station.
If the system is used for the first time, the system impedance adopts a default value; if historical data or real-time data exist, a new system impedance value is calculated, the system impedance value with the highest adjustment sensitivity in the last period of time is recorded, and if the calculated system impedance value exceeds the upper limit, the system impedance value with the highest adjustment sensitivity in the last period of time is adopted, so that the accuracy of the system impedance is improved, and the adjustment speed can be accelerated.
And 4, converting the voltage target value into a reactive power target value.
1) And calculating the difference between the target voltage value and the actual voltage value, and converting the voltage difference value into a reactive power difference value by using the system impedance value.
2) Setting a reactive power regulation coefficient according to the difference between the voltage target value and the actual voltage value; the reactive power regulating coefficient can be regulated according to the difference between the voltage target value and the actual voltage value, when the difference is larger, the reactive power regulating coefficient is increased, the regulating step is large, when the difference is smaller, the reactive power regulating coefficient is reduced, the regulating step is small, the reactive power is controlled, the voltage gradually approaches the target value, the regulation oscillation is avoided, the regulating efficiency is improved, and the reactive power regulating coefficient is smaller than or equal to 1.
3) Reactive power target value = reactive power difference x reactive power regulation coefficient.
Step 5, adjusting and distributing reactive power in the inverter and the reactive compensation equipment; when the reactive power is adjusted and distributed, the inverter with high sensitivity is preferentially adjusted.
1) Determining equipment which can participate in control according to the running states and the electric quantities of the inverter and the reactive compensation equipment;
2) calculating reactive power margin which can be adjusted by each controllable device;
3) finding out equipment with high adjustment sensitivity to perform full adjustment preferentially so as to improve adjustment speed and efficiency;
4) and other equipment performs distribution and calculation of the reactive power to be regulated by a set algorithm.
And 6, issuing instructions to each inverter and reactive power compensation equipment.
In order to reduce the adjustment interval, instructions are issued to the inverters and the reactive power compensation equipment in parallel.
And 7, after waiting for a period of time (which can be set to 10 s), checking whether a given voltage target value is reached, if so, ending, and if not, turning to the step 2.
The method increases the reactive power regulation coefficient, adjusts the system impedance, preferentially selects the inverter with high regulation sensitivity and sends the instruction in parallel, improves the regulation speed and precision and achieves the aim of high-efficiency voltage regulation.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (3)
1. The photovoltaic AVC control method is characterized by comprising the following steps: comprises the following steps of (a) carrying out,
step 1, receiving a voltage target value issued by scheduling;
step 2, acquiring a real-time information value of the photovoltaic power station;
step 3, calculating the system impedance of the photovoltaic power station;
if the system is used for the first time, the system impedance adopts a default value;
if historical data or real-time data exist, calculating a new system impedance value, recording a system impedance value with the highest adjustment sensitivity in the last period of time, and if the calculated system impedance value exceeds an upper limit, adopting the system impedance value with the highest adjustment sensitivity in the last period of time;
step 4, converting the voltage target value into a reactive power target value;
the reactive power target value = reactive power difference x reactive power adjustment coefficient;
wherein,
calculating the difference between the target voltage value and the actual voltage value, and converting the voltage difference value into a reactive power difference value by using the system impedance value;
setting a reactive power regulation coefficient according to the difference between the voltage target value and the actual voltage value;
step 5, adjusting and distributing reactive power in the inverter and the reactive compensation equipment;
during reactive power regulation and distribution, the inverter with high sensitivity is regulated preferentially;
step 6, issuing instructions to each inverter and reactive power compensation equipment in parallel;
step 7, after waiting for a period of time, checking whether a given voltage target value is reached, if so, ending, and if not, turning to the step 2;
the photovoltaic power station real-time information value comprises photovoltaic power station booster station electric quantity, operation state information and electric quantity of an inverter, and operation state and electric quantity of reactive compensation equipment.
2. The adaptive fast adjusting photovoltaic AVC control method of claim 1, wherein: the reactive power adjusting coefficient is adjusted according to the difference between the voltage target value and the actual voltage value, when the difference value is large, the reactive power adjusting coefficient is increased, and when the difference value is small, the reactive power adjusting coefficient is reduced.
3. The adaptive fast adjusting photovoltaic AVC control method of claim 1 or 2, wherein: and the reactive power regulating coefficient is less than or equal to 1.
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| CN106353625B (en) * | 2016-11-02 | 2019-06-11 | 广东电网有限责任公司佛山供电局 | The voltage power-less regulating effect detection method and system of substation |
| CN109710020B (en) * | 2018-12-05 | 2020-12-08 | 国电南瑞南京控制系统有限公司 | Active approximation type power control method and system for new energy power station |
| CN111817348A (en) * | 2020-07-31 | 2020-10-23 | 苏州华商新能源有限公司 | Reactive voltage control method for photovoltaic power station |
| CN119341024A (en) * | 2024-12-20 | 2025-01-21 | 杭州昱能电力检测有限公司 | A hybrid control method and system based on distributed power supply power quality management |
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| CN102868167A (en) * | 2012-09-11 | 2013-01-09 | 南京中德保护控制系统有限公司 | Reactive voltage control method of photovoltaic power station |
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| CN102868167A (en) * | 2012-09-11 | 2013-01-09 | 南京中德保护控制系统有限公司 | Reactive voltage control method of photovoltaic power station |
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