CN112670998B - Renewable energy power system voltage stability control method considering grid protection - Google Patents
Renewable energy power system voltage stability control method considering grid protection Download PDFInfo
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Abstract
The invention relates to a voltage stability control method of a renewable energy power system considering grid-related protection, which sets the fixed values of high/low voltage grid-related protection of the renewable energy power system and high/low voltage switching reactive power equipment of a third defense line on a voltage stability control device of a booster station of the renewable energy power generation system. The reactive capacity of the inverter cut off due to the grid protection is considered on the basis of the traditional power system voltage stabilization control device, excessive switching of reactive power equipment due to the fact that the inverter cut off due to the grid protection is omitted when the renewable energy power system voltage stabilization control device operates at high/low voltage can be avoided, continuous operation of part of the inverters due to the high/low voltage grid protection caused by the fact that the reactive power equipment is excessively switched on and off is avoided, breakdown of the voltage of the renewable energy power system due to mismatching of the grid protection and a third defense line is avoided, accordingly, the power failure range and economic loss of the system can be reduced, and the running stability and reliability of the power system are improved.
Description
Technical Field
The invention relates to the technical field of safe operation control of power systems, in particular to a voltage stability control method of a renewable energy power system considering network protection.
Background
The safety and stability standard of the electric power system in China for bearing large disturbance capacity is divided into three stages according to the safety and stability guide rule of the electric power system: the first-stage standard keeps stable operation and normal power supply of a power grid; the second level standard remains stable, but allows for loss of part load; third level standards when the system cannot maintain stable operation, it is necessary to prevent system breakdown and minimize load loss. According to the standard, three defense lines are set to ensure safe and stable operation of the power system when various accidents are met: the first defense line is used for quick and reliable relay protection and effective preventive control measures, so that the stable operation of the power grid and the normal power supply of the power grid are ensured when the common single fault occurs; the second defense line adopts emergency control measures such as a stable control device, a cutting machine, a cutting load and the like, so that the power grid can continue to keep running stably when serious faults with low probability occur; the third line of defense is provided with an out-of-step disconnection, frequency and voltage emergency control device, and when the power grid is stably damaged due to multiple serious accidents with low probability, the devices are used for preventing the expansion of the accidents and preventing large-area power failure.
With the increase of double pressure of environmental protection and energy demand, renewable energy sources such as photovoltaic power generation and wind power generation are widely popularized and applied, photovoltaic power generation equipment and wind power generation equipment are largely connected into a power grid, so that new challenges are brought to safe and stable operation of the power grid, in recent years, the occurrence of off-grid accidents of multiple renewable energy generator sets in China, and the problems of coordination and coordination between the characteristics of the renewable energy generator sets and the related network protection and the operation control of the power grid are widely focused. In the problems, the third defending measures such as low-frequency low-voltage load shedding, disconnection, high-frequency cutting machine, voltage stability control and the like are coordinated and matched with the network-related protection parameters of the renewable energy generator set most closely. In practice, similar problems are encountered after a renewable energy power system is accessed into a power grid on a large scale.
At present, the traditional third defense line voltage stability control device of the power system only considers and cuts off the reactive power equipment of the power system, but does not consider the negative influence of the grid protection caused by the inverter, because the grid protection cuts off the inverter, and the inverter is operated firstly due to the grid protection, the reactive power equipment or the inverter is possibly excessively switched when in high/low voltage operation, thereby being applied to the renewable energy power system, the high voltage of the renewable energy power system is caused, and part of the inverter continues to operate due to the high/low voltage grid protection, and the voltage breakdown of the renewable energy power system caused by the mismatch of the grid protection and the third defense line occurs, so that the system has a large-scale power failure. Therefore, the third line voltage stabilization control device of the traditional power system needs to be correspondingly modified if the third line voltage stabilization control device is arranged on the renewable energy power system.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a renewable energy power system voltage stability control method which can prevent a reactive power device or an over-cut inverter from being excessively switched due to the omission of an inverter with protection cut-off of a grid during high/low voltage operation, avoid the breakdown of the renewable energy power system voltage caused by the mismatch of the protection of the grid and a third defense line, reduce the power failure range and the economic loss of the system, and improve the operation stability and the reliability of the power system.
The invention adopts the following technical scheme:
a voltage stability control method of a renewable energy power system considering network protection comprises the following steps:
(1) acquiring a fixed value of high/low voltage switching reactive power equipment of a booster station of a renewable energy power generation system and a fixed value of high/low voltage grid-related protection of all inverters, and adding up the reactive power sum Q of the inverters cut off due to the high/low voltage grid-related protection S Zero clearing;
(2) judging whether the voltage of the inverter in the renewable energy power system meets the high/low voltage grid-related protection condition, if so, the inverter meeting the high/low voltage grid-related protection condition can act due to the high/low voltage grid-related protection, and recording the reactive power Q of each inverter when the inverter is cut off due to the grid-related protection j And counting the sum of all inverter reactive power cut off due to high/low voltage network protection
N is the total number of inverters cut off by high/low voltage network protection; if no inverter is operated by high/low voltage network protection, Q S Keeping unchanged, and directly turning to the step (3);
(3) based on the fixed value of high/low voltage switching reactive power equipment of a booster station of a renewable energy power generation system, judging whether the voltage of a bus of the booster station of the renewable energy power generation system meets the high/low voltage action condition of the current round, if so, searching the reactive power capacity Q which needs to be cut off or put in by the voltage stability control device of the current round I If the reactive power source needs to be cut off, the step (4) is carried out, and if the reactive power source needs to be put into, the step (5) is carried out; if the high/low pressure operation condition is not satisfied, returning to the step (2);
(4) the voltage of the bus of the booster station of the renewable energy power generation system meets the high-voltage action condition, and the reactive power source capacity Q needs to be cut off I In the case of (1), when Q I ≥Q S At the time, the actual capacity Q of the cut-off required for voltage stabilization control is calculated L ＝Q I -Q S Then the voltage stabilization control device cuts off the actual capacity Q according to the need L The size of the power source equipment of the booster station of the renewable energy power generation system is cut off; when Q is I ＜Q S When then Q L =0, without switching the non-power supply equipment; after the non-power supply equipment is completely cut off, Q S Resetting, and returning to the step (2) to perform the next round of judgment;
(5) the voltage of the bus of the booster station of the renewable energy power generation system meets the low-voltage action condition and needs to be input with the reactive power capacity Q I In the case of (2), the actual capacity Q required for voltage stabilization control is calculated L ＝Q S +Q I Then the voltage stabilization control device inputs the actual capacity Q according to the requirement L Is put into the reactive power equipment of the booster station of the renewable energy power generation system, and after the input of the reactive power equipment is completed, Q is calculated S And (3) clearing, and returning to the step (2) to perform the next round of judgment.
Further, the renewable energy power system is a photovoltaic power system, or a wind power generation power system, or a wind-photovoltaic power system.
Further, the renewable energy power generation system booster station is a photovoltaic power generation system booster station or a wind power generation system booster station.
Further, in the step (2), whether the voltage of the inverter in the renewable energy power system meets the high/low voltage grid-related protection condition is judged according to the comparison between the real-time voltage measured by the bus of the renewable energy power generation system booster station and the high/low voltage grid-related protection fixed value of the inverter, and when the real-time voltage measured by the bus of the renewable energy power generation system booster station is higher than the high voltage grid-related protection fixed value of the inverter, the inverter is judged to meet the high voltage grid-related protection condition; when the real-time voltage measured by the bus of the booster station of the renewable energy power generation system is lower than the low-voltage network-related protection fixed value of the inverter, the inverter is judged to meet the low-voltage network-related protection condition.
Further, in the step (3), based on the fixed value of the high/low voltage switching reactive power equipment of the booster station of the renewable energy power generation system, whether the voltage of the busbar of the booster station of the renewable energy power generation system meets the high/low voltage operation condition of the current round is judged, and when the voltage of the busbar of the booster station of the renewable energy power generation system is higher than the fixed value of the high voltage switching reactive power equipment of the booster station of the renewable energy power generation system, the high voltage operation condition of the current round is judged to be met; and when the voltage of the bus of the booster station of the renewable energy power generation system is lower than the fixed value of the low-voltage switching reactive power source equipment of the booster station of the renewable energy power generation system, judging that the low-voltage operation condition of the current round is met.
Further, in the step (1), the high/low voltage switching reactive power equipment fixed value of the booster station of the renewable energy power generation system is a fixed value for voltage stabilization control based on a third defense line of the renewable energy power system.
Further, in the step (1), the high/low voltage network-related protection fixed value of the inverter is a fixed value related to the configuration of the inverter itself.
As can be seen from the above description of the present invention, compared with the prior art, the present invention has the following beneficial effects:
the invention considers the reactive capacity of the inverter cut off due to the grid protection on the basis of the traditional power system voltage stabilization control device, and can avoid excessive switching of the reactive power equipment due to the omission of the grid protection cut-off inverter when the renewable energy power system voltage stabilization control device operates at high/low voltage, thereby preventing part of the inverter from continuing to operate due to the high/low voltage grid protection caused by the excessive switching of the reactive power equipment, avoiding the breakdown of the renewable energy power system voltage caused by the mismatch of the grid protection and the third defense line, reducing the power failure range and economic loss of the system, and improving the running stability and reliability of the power system.
Drawings
FIG. 1 is a flow chart of a method for controlling voltage stabilization of a renewable energy power system according to embodiment 1 of the present invention, which takes into account protection of a power grid;
fig. 2 is a flowchart of a method for controlling voltage stabilization of a renewable energy power system according to embodiment 2 of the present invention, which takes network protection into consideration.
Detailed Description
The invention is further described below by means of specific embodiments.
Example 1
Referring to fig. 1, a voltage stability control method of a renewable energy power system considering grid protection according to the present embodiment is applied to a photovoltaic power system, and includes the following steps:
(1) acquiring a fixed value of high/low voltage switching reactive power equipment of a booster station of a photovoltaic power generation system and a fixed value of high/low voltage grid-related protection of all inverters, and adding up the reactive power sum Q of the inverters cut off due to the high/low voltage grid-related protection S And (5) zero clearing. The fixed value of the high/low voltage switching reactive power source equipment of the booster station of the photovoltaic power generation system is a fixed value which is preset based on a third defense line of the photovoltaic power system and used for voltage stability control. The high/low voltage grid-related protection fixed value of the inverter is a factory-set fixed value related to the configuration of the inverter.
(2) And comparing the real-time voltage measured by the bus of the booster station of the photovoltaic power generation system with the high/low voltage grid-related protection fixed value of the inverter to judge whether the voltage of the inverter in the photovoltaic power system meets the high/low voltage grid-related protection condition. When the real-time voltage measured by the bus of the booster station of the photovoltaic power generation system is higher than the high-voltage grid-related protection fixed value of the inverter, judging that the inverter meets the high-voltage grid-related protection condition; when the real-time voltage measured by the bus of the booster station of the photovoltaic power generation system is lower than the low-voltage grid-related protection fixed value of the inverter, the inverter is judged to meet the low-voltage grid-related protection condition. If so, the inverter meeting the high/low voltage network protection condition is operated by the high/low voltage network protection, and the reactive power Q of each inverter at the moment when the inverter is cut off by the network protection is recorded j And counting the sum of all inverter reactive power cut off due to high/low voltage network protection
N is the total number of inverters cut off by high/low voltage network protection; if no inverter is operated by high/low voltage network protection, Q S Keeping unchanged, and directly turning to the step (3);
(3) and judging whether the voltage of the bus of the booster station of the photovoltaic power generation system meets the high/low voltage action condition of the turn or not based on the fixed value of the high/low voltage switching reactive power source equipment of the booster station of the photovoltaic power generation system. When the voltage of the bus of the booster station of the photovoltaic power generation system is higher than the fixed value of the high-voltage switching reactive power equipment of the booster station of the photovoltaic power generation system, judging that the high-voltage action condition of the round is met; and when the voltage of the bus of the booster station of the photovoltaic power generation system is lower than the fixed value of the low-voltage switching reactive power source equipment of the booster station of the photovoltaic power generation system, judging that the low-voltage operation condition of the turn is met. If yes, searching the reactive power source capacity Q of the round voltage stability control device to be cut or input I If the reactive power source needs to be cut off, the step (4) is carried out, and if the reactive power source needs to be put into, the step (5) is carried out; if the high/low pressure operation condition is not satisfied, returning to the step (2);
(4) the voltage of the bus of the booster station of the photovoltaic power generation system meets the high-voltage action condition, and the reactive power source capacity Q needs to be cut off I In the case of (1), when Q I ≥Q S At the time, the actual capacity Q of the cut-off required for voltage stabilization control is calculated L ＝Q I -Q S Then the voltage stabilization control device cuts off the actual capacity Q according to the need L The size of the reactive power equipment of the booster station of the photovoltaic power generation system is cut off; when Q is I ＜Q S When then Q L =0, without switching the non-power supply equipment; after the non-power supply equipment is completely cut off, Q S Resetting, and returning to the step (2) to perform the next round of judgment;
(5) the voltage of the bus of the booster station of the photovoltaic power generation system meets the low-voltage action condition and needs to be input into the reactive power source capacity Q I In the case of (2), the actual capacity Q required for voltage stabilization control is calculated L ＝Q S +Q I Then the voltage stabilization control device inputs the actual capacity Q according to the requirement L Is put into the photovoltaic power generationAfter the reactive power equipment of the system booster station is put into the reactive power equipment, Q is calculated S And (3) clearing, and returning to the step (2) to perform the next round of judgment.
Example 2
Referring to fig. 2, a method for controlling voltage stability of a renewable energy power system according to the present embodiment, which is applied to a wind power generation power system, includes the following steps:
(1) acquiring a fixed value of high/low voltage switching reactive power equipment of a booster station of a wind power generation system and a fixed value of high/low voltage grid-related protection of all inverters, and adding up the reactive power of the inverters cut off due to the high/low voltage grid-related protection to Q S And (5) zero clearing. The fixed value of the high/low voltage switching reactive power source equipment of the wind power generation system booster station is a fixed value which is preset based on a third defense line of the wind power generation system and used for voltage stability control. The high/low voltage grid-related protection constant of the inverter is a constant related to the configuration of the inverter itself.
(2) And judging whether the voltage of the inverter in the wind power generation power system meets the high/low voltage grid-related protection condition according to the real-time voltage measured by the bus of the booster station of the wind power generation system and the high/low voltage grid-related protection fixed value of the inverter. When the real-time voltage measured by the bus of the booster station of the wind power generation system is higher than the high-voltage grid-related protection fixed value of the inverter, judging that the inverter meets the high-voltage grid-related protection condition; when the real-time voltage measured by the bus of the booster station of the wind power generation system is lower than the low-voltage grid-related protection fixed value of the inverter, the inverter is judged to meet the low-voltage grid-related protection condition. If so, the inverter meeting the high/low voltage network protection condition is operated by the high/low voltage network protection, and the reactive power Q of each inverter at the moment when the inverter is cut off by the network protection is recorded j And counting the sum of all inverter reactive power cut off due to high/low voltage network protection
N is the total number of inverters cut off by high/low voltage network protection; if no inverter is operated by high/low voltage network protection, Q S Keeping unchanged, and directly turning to the step (3);
(3) and judging whether the voltage of the bus of the booster station of the wind power generation system meets the high/low voltage action condition of the current turn or not based on the fixed value of the high/low voltage switching reactive power source equipment of the booster station of the wind power generation system. When the voltage of the bus of the booster station of the wind power generation system is higher than the fixed value of the high-voltage switching reactive power equipment of the booster station of the wind power generation system, judging that the high-voltage action condition of the round is met; and when the voltage of the bus of the booster station of the wind power generation system is lower than the fixed value of the low-voltage switching reactive power source equipment of the booster station of the wind power generation system, judging that the low-voltage operation condition of the current turn is met. If yes, searching the reactive power source capacity Q of the round voltage stability control device to be cut or input I If the reactive power source needs to be cut off, the step (4) is carried out, and if the reactive power source needs to be put into, the step (5) is carried out; if the high/low pressure operation condition is not satisfied, returning to the step (2);
(4) the voltage of the bus of the booster station of the wind power generation system meets the high-voltage action condition, and the reactive power source capacity Q needs to be cut off I In the case of (1), when Q I ≥Q S At the time, the actual capacity Q of the cut-off required for voltage stabilization control is calculated L ＝Q I -Q S Then the voltage stabilization control device cuts off the actual capacity Q according to the need L The size of the reactive power equipment of the wind power generation system booster station is cut off; when Q is I ＜Q S When then Q L =0, without switching the non-power supply equipment; after the non-power supply equipment is completely cut off, Q S Resetting, and returning to the step (2) to perform the next round of judgment;
(5) the voltage of the bus of the booster station of the wind power generation system meets the low-voltage action condition and needs to be input into the reactive power source capacity Q I In the case of (2), the actual capacity Q required for voltage stabilization control is calculated L ＝Q S +Q I Then the voltage stabilization control device inputs the actual capacity Q according to the requirement L Is put into the reactive power equipment of the wind power generation system booster station, and after the input of the reactive power equipment is completed, Q is calculated S And (3) clearing, and returning to the step (2) to perform the next round of judgment.
Example 3
The embodiment is applied to a wind power-photovoltaic power system, wherein the wind power-photovoltaic power system comprises a wind power generation power system and a photovoltaic power system. The photovoltaic power system is controlled by the renewable energy power system voltage stabilization control method taking into account the grid protection of embodiment 1, and the wind power generation power system is controlled by the renewable energy power system voltage stabilization control method taking into account the grid protection of embodiment 2.
The foregoing is only three embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modification of the present invention by using the concept should be construed as infringement of the protection scope of the present invention.
Claims (7)
1. A renewable energy power system voltage stability control method considering network protection is characterized in that: the method comprises the following steps:
(1) acquiring a fixed value of high/low voltage switching reactive power equipment of a booster station of a renewable energy power generation system and a fixed value of high/low voltage grid-related protection of all inverters, and adding up the reactive power sum Q of the inverters cut off due to the high/low voltage grid-related protection S Zero clearing;
(2) judging whether the voltage of the inverter in the renewable energy power system meets the high/low voltage grid-related protection condition, if so, the inverter meeting the high/low voltage grid-related protection condition can act due to the high/low voltage grid-related protection, and recording the reactive power Q of each inverter when the inverter is cut off due to the grid-related protection j And counting the sum of all inverter reactive power cut off due to high/low voltage network protection
N is the total number of inverters cut off by high/low voltage network protection; if no inverter is operated by high/low voltage network protection, Q S Keeping unchanged, and directly turning to the step (3);
(3) based on the fixed value of high/low voltage switching reactive power equipment of a booster station of a renewable energy power generation system, judging whether the voltage of a bus of the booster station of the renewable energy power generation system meets the high/low voltage action condition of the current round, if so, searching the reactive power capacity Q which needs to be cut off or put in by the voltage stability control device of the current round I If the reactive power source needs to be cut off, the step (4) is carried out, and if the reactive power source needs to be put into, the step (5) is carried out; if the high/low pressure operation condition is not satisfied, returning to the step (2);
(4) the voltage of the bus of the booster station of the renewable energy power generation system meets the high-voltage action condition, and the reactive power source capacity Q needs to be cut off I In the case of (1), when Q I ≥Q S At the time, the actual capacity Q of the cut-off required for voltage stabilization control is calculated L ＝Q I -Q S Then the voltage stabilization control device cuts off the actual capacity Q according to the need L The size of the power source equipment of the booster station of the renewable energy power generation system is cut off; when Q is I ＜Q S When then Q L =0, without switching the non-power supply equipment; after the non-power supply equipment is completely cut off, Q S Resetting, and returning to the step (2) to perform the next round of judgment;
(5) the voltage of the bus of the booster station of the renewable energy power generation system meets the low-voltage action condition and needs to be input with the reactive power capacity Q I In the case of (2), the actual capacity Q required for voltage stabilization control is calculated L ＝Q S +Q I Then the voltage stabilization control device inputs the actual capacity Q according to the requirement L Is put into the reactive power equipment of the booster station of the renewable energy power generation system, and after the input of the reactive power equipment is completed, Q is calculated S And (3) clearing, and returning to the step (2) to perform the next round of judgment.
2. The method for controlling voltage stability of the renewable energy power system according to claim 1, wherein the method is characterized in that: the renewable energy power system is a photovoltaic power system, or a wind power generation power system, or a wind-photovoltaic power system.
3. The method for controlling voltage stability of the renewable energy power system according to claim 1, wherein the method is characterized in that: the renewable energy power generation system booster station is a photovoltaic power generation system booster station or a wind power generation system booster station.
4. The method for controlling voltage stability of the renewable energy power system according to claim 1, wherein the method is characterized in that: in the step (2), whether the voltage of the inverter in the renewable energy power system meets the high/low voltage grid-related protection condition is judged according to the comparison between the real-time voltage measured by the bus of the renewable energy power generation system booster and the high/low voltage grid-related protection fixed value of the inverter, and when the real-time voltage measured by the bus of the renewable energy power generation system booster is higher than the high voltage grid-related protection fixed value of the inverter, the inverter is judged to meet the high voltage grid-related protection condition; when the real-time voltage measured by the bus of the booster station of the renewable energy power generation system is lower than the low-voltage network-related protection fixed value of the inverter, the inverter is judged to meet the low-voltage network-related protection condition.
5. The method for controlling voltage stability of the renewable energy power system according to claim 1, wherein the method is characterized in that: in the step (3), based on the fixed value of the high/low voltage switching reactive power source equipment of the booster station of the renewable energy power generation system, whether the voltage of the busbar of the booster station of the renewable energy power generation system meets the high/low voltage operation condition of the current round is judged, and when the voltage of the busbar of the booster station of the renewable energy power generation system is higher than the fixed value of the high voltage switching reactive power source equipment of the booster station of the renewable energy power generation system, the high voltage operation condition of the current round is judged to be met; and when the voltage of the bus of the booster station of the renewable energy power generation system is lower than the fixed value of the low-voltage switching reactive power source equipment of the booster station of the renewable energy power generation system, judging that the low-voltage operation condition of the current round is met.
6. The method for controlling voltage stability of the renewable energy power system according to claim 1, wherein the method is characterized in that: in the step (1), the fixed value of the high/low voltage switching reactive power source equipment of the booster station of the renewable energy power generation system is a fixed value for voltage stability control based on the third defense line of the renewable energy power system.
7. The method for controlling voltage stability of the renewable energy power system according to claim 1, wherein the method is characterized in that: in the step (1), the high/low voltage network-related protection fixed value of the inverter is a fixed value related to the configuration of the inverter itself.
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