CN-115021263-B - Wind fire bundling system delivery and new energy consumption optimization regulation and control method and system

CN115021263BCN 115021263 BCN115021263 BCN 115021263BCN-115021263-B

Abstract

The invention provides an optimization regulation and control method and system for air fire bundling system delivery and new energy consumption, comprising the steps of setting a dynamic reactive current proportionality coefficient under a large-output mode of a thermal power unit, merging the dynamic reactive current proportionality coefficient into the new energy unit according to a set new energy grid-connected proportion, cutting off the thermal power unit according to a set stable control cutting number, performing transient stability check, increasing system load to reduce delivery power flow until a transient power angle and transient voltage are stable, obtaining a stable system first delivery power flow, increasing the output of the new energy unit under the first delivery power flow, cutting off the thermal power unit according to the set stable control cutting number, performing transient stability check, gradually reducing the output of the new energy unit until the air fire bundling system is stable in transient state, and obtaining the output value of the new energy unit. Aiming at the fact that the system is limited by transient frequency and voltage, the new energy consumption capability is limited, an optimized stable control strategy is provided, and the new energy consumption capability can be effectively improved on the basis that the outward delivery capability is not affected.

Inventors

DOU YUYU
ZHANG SHUANG
ZHAO ZHENYU
LIN NAN
REN ZHENG
YANG PENGWEI
CHEN XIAOLU
ZHENG BOWEN
CHEN CAIFU
WANG XINYU
WANG JUNFANG

Assignees

国网内蒙古东部电力有限公司电力科学研究院
国网内蒙古东部电力有限公司电力科学研究院
国家电网有限公司
国家电网有限公司

Dates

Publication Date: 20260421
Application Date: 20220420
Priority Date: 20220420

Claims (9)

1. The method for optimizing and regulating the delivery of the wind-fire bundling system and the new energy consumption is characterized by comprising the following steps: Setting a dynamic reactive current proportionality coefficient under a large output mode of the thermal power unit, merging the dynamic reactive current proportionality coefficient into a new energy unit according to a set new energy grid-connected proportion, cutting off the thermal power unit according to a set stable control switching number, performing transient stability check, increasing system load, reducing outgoing power flow until a transient power angle and transient voltage are stable, and obtaining a stable first outgoing power flow of the system; under the first outgoing tide, the output of the new energy unit is increased, the thermal power unit is cut off according to the set stable control quantity of the cutting machines, transient stability check is carried out, the output of the new energy unit is gradually reduced until the transient stability of the wind fire bundling system is achieved, and the output value of the new energy unit is obtained, and the method comprises the following steps: Maintaining the system outgoing power flow as the first outgoing power flow, cutting off the set number of thermal power units under the condition that the regional thermal power units are started at minimum and the technological output is minimum, increasing the output of the new energy unit, performing transient stability check, and gradually reducing the output of the new energy unit until the transient power angle and the transient voltage are stable, so as to obtain the initial new energy unit output N W ; And maintaining the system outgoing power flow as a first outgoing power flow, taking the new energy unit output as N W as an initial state, recovering the active power of the new energy unit according to the set active power recovery speed of the new energy under the minimum starting-up and minimum technical output of the regional thermal power unit, checking the transient frequency and the overvoltage, and gradually reducing the new energy unit output until the transient frequency and the transient overvoltage are not out of limit, thus obtaining the final new energy unit output N W1 .
2. The method for optimizing and controlling the delivery of the wind-fire bundling system and the new energy consumption according to claim 1 is characterized in that the dynamic reactive current proportionality coefficient is set to be 1.5; or setting the new energy grid-connected proportion of the system according to the average grid-connected proportion of the new energy units in the area where the wind-fire bundling system is located.
3. The method for optimizing and controlling the delivery of a wind-fire bundling system and the new energy consumption according to claim 1, wherein the step of increasing local load to reduce the delivery tide is to increase the load of the region where the wind-fire bundling system is located and reduce the delivery tide.
4. The method for optimizing and controlling the delivery of a wind-fire bundling system and the consumption of new energy according to claim 1 is characterized in that the active power recovery speed of the set new energy is 20% P N /s.
5. The method for optimizing and controlling the delivery of the wind and fire bundling system and the new energy consumption according to claim 1, wherein if the obtained new energy unit output value N W1 cannot meet the regional new energy consumption requirement, sequentially reducing the number of stable control cutters of the thermal power unit, and carrying out transient stability check again to obtain the new energy consumption capacity under the different numbers of stable control cutters of the thermal power unit, and obtaining the maximum new energy consumption capacity N W2 and the corresponding number of stable control cutters of the thermal power unit; the method for carrying out transient stability check again comprises the steps of increasing the output of a new energy unit under the first outgoing tide, cutting off the thermal power unit according to the reduced number of the stable control switchgears, carrying out transient stability check, and obtaining the output value of the new energy unit by gradually reducing the output of the new energy unit until the transient state of a wind fire bundling system is stable.
6. The method for optimizing and controlling the delivery of the wind and fire bundling system and the new energy consumption according to claim 5, wherein the method is characterized in that in the checking process, the number of thermal power generating units is determined according to the actual output of the new energy units, the number of thermal power generating units is controlled to be N 1 when the actual output of the new energy units is smaller than N W1 , and the number of thermal power generating units is controlled to be N 2 when the actual output of the new energy units is larger than N W1 and not larger than N W2 , and the output of the new energy units is controlled to be N W2 .
7. Wind fire bundling system send and new forms of energy consumption optimization regulation and control system outward, its characterized in that includes: The system comprises an outgoing power flow determining module, a power supply flow stabilizing module and a power supply flow stabilizing module, wherein the outgoing power flow determining module is configured to set a dynamic reactive current proportionality coefficient under a large output mode of the thermal power unit, merge the dynamic reactive current proportionality coefficient into a new energy unit according to a set new energy grid-connected proportion, cut off the thermal power unit according to a set number of stable control switchgears, perform transient stability check, increase system load and reduce outgoing power flow until a transient power angle and transient voltage are stable, and obtain a stabilized system first outgoing power flow; The new energy output determining module is configured to increase the output of the new energy unit under the first outgoing tide, cut off the thermal power unit according to the set number of the stable control switchgears, perform transient stability check, and obtain the new energy unit output value by gradually reducing the new energy unit output until the wind fire bundling system is transient stable, and comprises the following steps: Maintaining the system outgoing power flow as the first outgoing power flow, cutting off the set number of thermal power units under the condition that the regional thermal power units are started at minimum and the technological output is minimum, increasing the output of the new energy unit, performing transient stability check, and gradually reducing the output of the new energy unit until the transient power angle and the transient voltage are stable, so as to obtain the initial new energy unit output N W ; And maintaining the system outgoing power flow as a first outgoing power flow, taking the new energy unit output as N W as an initial state, recovering the active power of the new energy unit according to the set active power recovery speed of the new energy under the minimum starting-up and minimum technical output of the regional thermal power unit, checking the transient frequency and the overvoltage, and gradually reducing the new energy unit output until the transient frequency and the transient overvoltage are not out of limit, thus obtaining the final new energy unit output N W1 .
8. An electronic device comprising a memory and a processor and computer instructions stored on the memory and running on the processor, which when executed by the processor, perform the steps of the method of any one of claims 1-6.
9. A computer readable storage medium storing computer instructions which, when executed by a processor, perform the steps of the method of any of claims 1-6.

Description

Wind fire bundling system delivery and new energy consumption optimization regulation and control method and system Technical Field The disclosure relates to the technical field related to power system regulation and control, in particular to an optimal regulation and control method and system for wind-fire bundling system delivery and new energy consumption. Background The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. The reverse distribution between the power resources and the power loads, together with the volatility and randomness of new energy power generation, enables the intensive development of new energy and the bundling and concentrated delivery of wind, light and fire to become one of important actions for constructing a novel power system, and is also a more reasonable energy development and utilization mode. However, the mode combines the new energy with the extra-high voltage direct current and synchronous units together, so that the power electronic equipment and the control system thereof are mutually interwoven with the traditional alternating current system, and the control rule and the operation characteristic interact, so that the system stability mechanism is more complex, and the transient stability problem of the large-capacity new energy accessing into the power system, including power angle, voltage, frequency stability, stability control measures and the like, is researched, and the method has important theoretical significance and engineering practical value. The inventor finds that the wind-fire combined control strategy generally adopted by the current wind-fire bundling system is limited by transient power angle and voltage stability after the cross line fault of the connecting channel under the high-output and zero-output modes of the thermal power unit, and is insufficient in system external delivery capacity, and limited by transient frequency stability after the cross line fault of the connecting channel under the low-output and high-output modes of the thermal power unit. According to the power balance result, surplus power of the wind-fire bundling system is higher, and if the wind power generation time rate is always above 70% in a heavy wind period, the surplus power is higher. Therefore, the wind fire bundling weak delivery system is severely insufficient in overall delivery capacity and new energy (such as wind power) absorption capacity due to stable restriction of transient power angle, voltage and frequency after the cross line fault of the communication channel. Disclosure of Invention In order to solve the problems, the method and the system for optimizing and regulating the delivery of the wind-fire bundling system and the new energy consumption are provided, and an optimized stable control strategy is provided for the situations that the system is limited by transient frequency and voltage, the new energy consumption is limited, and the like, so that the new energy consumption can be effectively improved on the basis that the delivery capacity is not influenced. In order to achieve the above purpose, the present disclosure adopts the following technical scheme: One or more embodiments provide an optimized regulation method for wind-fire bundling system delivery and new energy consumption, comprising the following steps: Under the large output mode of the thermal power unit, setting a dynamic reactive current proportionality coefficient, merging the dynamic reactive current proportionality coefficient into a new energy unit according to a set new energy grid-connected proportion, cutting off the thermal power unit according to a set stable control switching number, performing transient stability check, increasing system load, reducing outgoing power flow until a transient power angle and a transient voltage are stable, and obtaining a stable first outgoing power flow of the system; And under the first outgoing tide, the output of the new energy unit is increased, the thermal power unit is cut off according to the set stable control quantity of the cutting machines, transient stability check is carried out, and the output value of the new energy unit is obtained by gradually reducing the output of the new energy unit until the transient stability of the wind fire bundling system. One or more embodiments provide an air fire bundling system delivery and new energy consumption optimization regulation system, comprising: The outgoing power flow determining module is configured to set a dynamic reactive current proportionality coefficient under a large output mode of the thermal power unit, incorporate the dynamic reactive current proportionality coefficient into the new energy unit according to a set new energy grid-connected proportion, cut off the thermal power unit according to a set stable control switching number, perform transient stability check, increase system