CN114188969B - Offshore wind power debugging method based on black start - Google Patents
Offshore wind power debugging method based on black start Download PDFInfo
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- CN114188969B CN114188969B CN202110818764.1A CN202110818764A CN114188969B CN 114188969 B CN114188969 B CN 114188969B CN 202110818764 A CN202110818764 A CN 202110818764A CN 114188969 B CN114188969 B CN 114188969B
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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
- H02J3/381—Dispersed generators
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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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
- H02J3/241—The oscillation concerning frequency
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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
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
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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
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/28—The renewable source being wind energy
-
- 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
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The invention relates to a black start-based offshore wind power debugging method, which comprises the following steps: establishing a black start system and defining the electrical connection and relay protection configuration among all the devices of the system; measuring and calculating electrical parameters of a main transformer, a fan box transformer and a current collecting sea cable of the booster station, and determining capacity parameters of a diesel generator set, a variable load and a transformer; carrying out a zero lifting voltage test on the offshore booster station by using a black start system, and carrying out nuclear phase and insulation inspection on each system of the booster station; the black start system and the diesel generator for the station are combined to further expand the capacity; carrying out a zero lifting pressure test on the current collecting submarine cable and the fan box transformer substation by using a black start system; and providing a stable debugging power supply for the fan by using the black start system, and completing the fan debugging and pre-grid connection work. According to the invention, before the formal power supply is delivered, the black start system can be used for completing the work related to fan debugging, calibration and pre-grid connection, and after the formal power supply is delivered, grid connection is directly performed, so that the period of offshore wind power grid connection is greatly shortened.
Description
Technical Field
The invention belongs to the technical field of wind power grid connection, and particularly relates to a black start-based offshore wind power debugging method.
Background
Wind energy is renewable clean energy, and in recent years, offshore wind power development is rapid, and future markets are wide. The large-scale offshore wind power resource is accessed, and a large amount of traditional fossil energy sources are replaced to generate electricity, so that the carbon emission is reduced.
The current engineering construction mode of offshore wind power is that an offshore booster station is built, and a formal power supply is sent to the offshore booster station before power transmission debugging of a fan is carried out. However, due to the influence of the land booster station and the submarine cable laying period, the time for the formal power supply to reach the offshore booster station is uncertain, and if the fan debugging can be completed before the formal power supply reaches the offshore booster station by utilizing the new technology, the construction period of offshore wind power is greatly shortened.
Disclosure of Invention
In order to break the conventional construction flow of 'first power transmission and then debugging' of the offshore wind power, finish the relevant work of fan debugging, calibration and pre-grid connection before the formal power supply is transmitted, shorten the offshore wind power grid connection period, the invention provides a black start-based offshore wind power debugging method.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a black start-based offshore wind power debugging method comprises the following steps:
step 1: establishing a black start system, and defining electrical connection and relay protection configuration among devices in the system, wherein core devices of the black start system comprise a diesel generator set, a variable load and a transformer;
step 2: measuring and calculating electrical parameters of a main transformer, a fan box transformer and a current collecting sea cable of the booster station, and determining capacity parameters of a diesel generator set, a variable load and a transformer of the black start system;
step 3: carrying out a zero lifting voltage test on the offshore booster station by using a black start system, and carrying out nuclear phase and insulation inspection on each system of the booster station;
step 4: combining a black start system with a diesel generator for a station to further expand the black start system;
step 5: carrying out a zero lifting pressure test on the current collecting submarine cable and the fan box transformer substation by using a black start system;
step 6: and providing a stable debugging power supply for the fan by using the black start system, and completing the fan debugging and pre-grid connection work.
In the step 1, the voltage of 400V on the outgoing line side of the diesel generator set and the variable load is respectively boosted to 35kV through a transformer and then is connected to a grounding transformer on a 35kV bus of an offshore booster station through a flame-retardant cable, a high-voltage switch cabinet is additionally arranged after the high-voltage side of the transformer is connected in parallel, and the high-voltage switch cabinet is provided with a voltage transformer, a current transformer, a circuit breaker and an electrified display and overvoltage device; the diesel generator set, the variable load and the transformer are respectively arranged in the container to prevent moisture and salt mist, so that reliable operation of the equipment is ensured.
Further, in step 1, the protection configuration of the high-voltage switch cabinet includes differential protection, instantaneous overcurrent protection, time-limited quick-break protection, overcurrent protection, overload protection, non-electric quantity protection, and the protection configuration of the low-voltage switch at the outlet side of the diesel generator set and the variable load includes ground protection, overvoltage/undervoltage protection, overcurrent protection, reverse power protection, and loss of magnetic protection; the short-circuit impedance of the transformer at the outlet side of the diesel generator set and the variable load is designed according to the minimum value allowed to improve the short-circuit current and ensure the sensitivity of relay protection equipment; the black start system realizes a continuous tripping principle in an electric hard wiring mode, and the tripping of the high-voltage side 35kV system must be ensured while the tripping of the low-voltage side diesel generator set and the tripping of the variable load switch are ensured; a definite disconnection point is arranged between the grounding transformer and the high-voltage switch cabinet, and a flame-retardant cable at the disconnection position has a sufficient safety distance; the variable load is powered by a station diesel generator as an operating power source.
Further, in step 2, the charging current I of the sea cable to ground capacitor is collected c Is that
I c ＝jwCU N ，
Wherein C is a collector sea cable to ground charging capacitor, U N For system line voltage, the current collecting submarine cable is groundedCapacitor charging power Q c Is that
Wherein C is l The capacitance value is charged for each kilometer of current collecting submarine cable, and l is the length of the current collecting submarine cable;
the variable load capacity parameter selection method comprises the following steps: the inductive capacity of the variable load needs to be capable of fully counteracting reactive capacity and leaving a certain margin for flexible adjustment, and the resistive capacity of the variable load needs to be capable of counteracting active power generated by a fan when the fan is connected to generate power so as to maintain active balance of the system and leave a certain margin for flexible adjustment;
the capacity parameter selection method of the diesel generating set comprises the following steps: under the allowable condition, a diesel generator set with large capacity is used as much as possible so as to ensure the success rate of wind power debugging;
the method for selecting the capacity parameters of the transformer comprises the following steps: the capacity of the transformer on the outlet side of the diesel generator set must be larger than the capacity of the diesel generator set with a certain margin, and the capacity of the transformer on the outlet side of the variable load must be configured according to the capacity of the variable load.
Further, the step 3 specifically includes the following steps:
1) Taking a diesel generator set as a power supply and a variable load as a load, and respectively carrying out a zero lifting voltage test on each main transformer and branches thereof in the booster station by using a black start system;
2) After the voltage is stabilized, the nuclear phase work of the 35kV current collection submarine cable voltage transformer, the 35kV bus voltage transformer and the 220kV bus voltage transformer is respectively completed;
3) And (5) completing the insulation inspection work of the system.
Further, in the step 4, corresponding synchronous parallel devices of the diesel generator sets are required to be installed in the two sets in the parallel operation process of the black start system and the diesel generator for the booster station.
Further, the step 5 specifically includes the following steps:
1) Carrying out a zero lifting pressure test on the current collecting submarine cable and the fan box transformer by using the diesel generating set, and ensuring dynamic balance of active power and reactive power of the system in the test process;
2) And after the voltage is stable, finishing the insulation inspection work of the system.
Further, the step 6 specifically includes the following steps:
1) Providing a stable debugging power supply by using a black start system, and carrying out static/dynamic debugging on fans on the current collecting sea cable one by one;
2) And after the fan is debugged, starting pre-grid-connected power generation, and dynamically adjusting the output and the variable load capacity of the diesel generator set during the period to keep the balance of active power and reactive power in the system, prevent the voltage and the frequency from greatly fluctuating and ensure the stable operation of the system.
The offshore wind power debugging method provided by the invention has the following advantages and practical significance: the conventional construction process of 'power first and then debugging' in the offshore wind power industry is broken, the construction period of the offshore wind power is greatly shortened, the wind power station can generate power in a grid-connected mode in advance, more clean energy sources are provided, considerable economic benefits are created for power generation enterprises, and fossil energy transformation is accelerated.
Drawings
Fig. 1 is a schematic diagram of a black start system and relay protection configuration thereof.
Fig. 2 is a simplified schematic diagram of the internal equipment of the black start system.
Fig. 3 is a schematic diagram of a black start system and a typical offshore booster station with zero boost.
Fig. 4 is a schematic diagram of the layout of the black start system in the booster station.
Fig. 5 is a schematic diagram of fan commissioning using a black start system.
Fig. 6 is a schematic diagram of a power supply loop during grid-connected power generation of a fan.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings.
The invention provides a black start-based offshore wind power debugging method, which mainly comprises the following steps:
step 1: and establishing a black start system and defining the electrical connection and relay protection configuration among all devices in the system.
Fig. 1 is a schematic diagram of components of a black start system and relay protection configurations thereof, and a primary diagram of the black start system is shown in a thick black dashed box. Fig. 2 is a simplified schematic diagram of internal equipment of the black start system, wherein the core equipment of the black start system comprises a diesel generator set, a variable load and a transformer, the offshore condition is severe, the salt and alkali degree is high, and each equipment in the black start system needs to adopt corresponding dampproof and salt fog prevention measures and is respectively arranged in a container so as to ensure the reliable operation of the equipment. After the voltage of 400V on the outgoing line side of the diesel generator set and the variable load is respectively boosted to 35kV by a transformer, the voltage is connected to the grounding transformer on one section and four sections of bus of the offshore booster station 35kV by a flame-retardant cable.
According to relay protection related criteria, the system related equipment needs to meet the following conditions:
(1) The high-voltage side of the transformer is required to be additionally provided with a high-voltage switch cabinet, and a voltage transformer (PT), a Current Transformer (CT) breaker and an electrified display and overvoltage device are configured and installed; the high-voltage switch QF1 is required to be provided with differential protection, instantaneous overcurrent protection, time-limited quick-break protection, overcurrent protection, overload protection and non-electric quantity protection;
(2) The low-voltage switches QF2 and QF3 on the outlet side of the diesel generator set and the variable load are required to be provided with conventional protection such as grounding protection, overvoltage/undervoltage protection, overcurrent protection, reverse power protection, loss of magnetic protection and the like, and a high-jump low jump principle is required to be realized in an electric hard wiring mode, namely, the diesel generator set on the low-voltage side and the variable load switch are required to be simultaneously jumped off while a high-voltage side 35kV system trips;
(3) For the relay protection block, the problem and difficulty are also solved, the short-circuit current of the black start system is smaller, so that the sensitivity of relay protection equipment needs to be improved, the design of the short-circuit impedance of the transformers according to the allowable minimum value is considered, the sensitivity of relay protection is ensured, and the high-voltage sides of the two transformers are connected in parallel and then are connected into a 35kV one-section bus and four-section bus grounding variable interval respectively;
(4) A definite disconnection point is needed between the grounding transformer and the high-voltage switch cabinet, and a sufficient safety distance is needed to be ensured for the flame-retardant cable at the disconnection position. In addition to the configuration of relay protection, the variable load also needs to be connected to an operating power source, where a small diesel generator for the station can be used for power supply.
Step 2: according to the measured and calculated electrical parameters of the main transformer of the booster station, the fan box transformer and the current collecting sea cable, the capacity parameters of a diesel generator set, a variable load and a transformer of the black start system are determined:
(1) Variable load capacity selection method
The variable load is an important component of the black start system, and one of the purposes of the variable load is to offset the influence of the 35kV current collection submarine cable charging capacitor on the stability of the black start system. Therefore, the reactive load of the current collection submarine cable and the fan box transformer substation needs to be calculated first, so that the variable load capacity is confirmed.
The charging current of the current collection submarine cable to ground capacitor is as follows:
I c ＝jwCU N ，
wherein I is c The current is the charging current of the collector sea cable to the ground capacitor, C is the collector sea cable to the ground capacitor, U N Is the system line voltage.
Further, the charging power Q of the collector submarine cable to ground capacitor can be obtained c The method comprises the following steps:
wherein C is l And the capacitance value is charged for each kilometer of current collecting submarine cable, and l is the length of the current collecting submarine cable.
The variable value load of the fan case is calculated according to fixed parameters in the transformer nameplate, and is not described in detail herein. On the basis, the inductive capacity of the variable load is ensured to fully offset the reactive capacity of the part, and a certain margin is kept for flexible adjustment. In addition, the variable load also needs a certain resistive capacity to act as a load to offset active power emitted by the fan when the fan is in grid-connected power generation, so that the active balance of the system is maintained. For fans in the current market, grid-connected debugging can be completed by generally outputting 10% -20% of rated power of the fans. Therefore, the resistive capacity in the variable load needs to meet the above requirements and leave a certain margin for flexible adjustment.
(2) Capacity parameter selection method for diesel generator set
In a black start system, the diesel generator set is the active power source of the whole system, so determining the capacity of the diesel generator set requires defining the active demand of the whole system. For this system, the main active power requirements are the fan load itself (mainly the active loss requirements of the fan excitation system, the control system, and the heating and dehumidifying) and the no-load loss of the fan box-section. It should be noted that the larger the capacity of the diesel-electric set, the larger the adjustable margin of the diesel-electric set, and the higher the system stability. Therefore, in order to ensure the success rate of wind power debugging, the diesel generator set with larger capacity is used as much as possible under the possible condition.
(3) Method for selecting capacity parameters of boosting transformer and reducing transformer
For the two transformers, the boosting transformer is mainly used for converting the 400V voltage at the outlet side of the diesel generating set into the 35kV high-voltage side voltage, so that the boosting transformer capacity is required to be larger than the capacity of the diesel generating set, and a certain margin is reserved; likewise, buck converters are mainly used to power variable loads, and thus buck capacity needs to be configured according to variable load capacity. Besides capacity design, the short-circuit impedance of the two transformers is designed according to the minimum value as far as possible, so that the short-circuit current of the system can be further improved, and the relay protection sensitivity is improved.
Step 3: the black start system is utilized to carry out a zero lifting voltage test on the offshore booster station, and nuclear phase and insulation inspection is carried out on each system of the booster station, and fig. 3 is a schematic diagram of the black start system to carry out zero lifting voltage boosting on a typical offshore booster station, and the specific steps are as follows:
(1) Taking a diesel generator set as a power supply and a variable load as a load, and respectively carrying out a zero lifting voltage test on each main transformer and branches thereof in the booster station by using a black start system;
(2) After the voltage is stabilized, the nuclear phase work of the 35kV current collection submarine cable voltage transformer, the 35kV bus voltage transformer and the 220kV bus voltage transformer is respectively completed;
(3) And (5) completing the insulation inspection work of the system.
Step 4: the black start system and the diesel generator for the station are combined to further expand the black start system, and corresponding synchronous parallel devices of the diesel generator sets are required to be installed in the two sets in the combining process, as shown in fig. 4.
Step 5: the black start system is utilized to carry out a zero lifting pressure test on the current collection submarine cable and the fan box transformer substation, and the specific steps are as follows:
(1) Carrying out a zero lifting pressure test on the current collecting submarine cable and the fan box transformer by using the diesel generating set, and ensuring dynamic balance of active power and reactive power of the system in the test process;
(2) And after the voltage is stable, finishing the insulation inspection work of the system.
Step 6: the black start system is utilized to provide a stable debugging power supply for the fan, the fan debugging and pre-grid-connection work is completed, schematic diagrams of power supply loops during fan debugging and grid-connection power generation are respectively shown in fig. 5 and 6, and the specific steps are as follows:
(1) Providing a stable debugging power supply by using a black start system, and carrying out static/dynamic debugging on fans on the current collecting sea cable one by one;
(2) And after the fan is debugged, starting pre-grid-connected power generation, and dynamically adjusting the output and the variable load capacity of the diesel generator set during the period to keep the balance of active power and reactive power in the system, prevent the voltage and the frequency from greatly fluctuating and ensure the stable operation of the system.
The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above examples, and all technical solutions belonging to the concept of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to the invention without departing from the principles thereof are intended to be within the scope of the invention as set forth in the following claims.
Claims (6)
1. The offshore wind power debugging method based on black start is characterized by comprising the following steps of:
step 1: establishing a black start system, and defining electrical connection and relay protection configuration among devices in the system, wherein core devices of the black start system comprise a diesel generator set, a variable load and a transformer;
the voltage of 400V of the outgoing line side of the diesel generator set and the variable load is respectively boosted to 35kV through a transformer and then is connected to a grounding transformer on a 35kV bus of an offshore booster station through a flame-retardant cable, the high-voltage side of the transformer is connected in parallel and then is additionally provided with a high-voltage switch cabinet, and the high-voltage switch cabinet is provided with a voltage transformer, a current transformer, a circuit breaker and an electrified display and overvoltage device; the diesel generator set, the variable load and the transformer are respectively arranged in the container to prevent moisture and salt mist, so that reliable operation of equipment is ensured;
the protection configuration of the high-voltage switch cabinet comprises differential protection, instantaneous overcurrent protection, time-limited quick-break protection, overcurrent protection, overload protection and non-electric quantity protection, and the protection configuration of the low-voltage switch at the outlet side of the diesel generator set and the variable load comprises grounding protection, overvoltage/undervoltage protection, overcurrent protection, reverse power protection and loss of magnetism protection; the short-circuit impedance of the transformer at the outlet side of the diesel generator set and the variable load is designed according to the minimum value allowed to improve the short-circuit current and ensure the sensitivity of relay protection equipment; the black start system realizes a continuous tripping principle in an electric hard wiring mode, and the tripping of the high-voltage side 35kV system must be ensured while the tripping of the low-voltage side diesel generator set and the tripping of the variable load switch are ensured; a definite disconnection point is arranged between the grounding transformer and the high-voltage switch cabinet, and a flame-retardant cable at the disconnection position has a sufficient safety distance; the variable load is powered by using a station diesel generator as an operating power supply;
step 2: measuring and calculating electrical parameters of a main transformer, a fan box transformer and a current collecting sea cable of the booster station, and determining capacity parameters of a diesel generator set, a variable load and a transformer of the black start system;
step 3: carrying out a zero lifting voltage test on the offshore booster station by using a black start system, and carrying out nuclear phase and insulation inspection on each system of the booster station;
step 4: combining a black start system with a diesel generator for a station to further expand the black start system;
step 5: carrying out a zero lifting pressure test on the current collecting submarine cable and the fan box transformer substation by using a black start system;
step 6: and providing a stable debugging power supply for the fan by using the black start system, and completing the fan debugging and pre-grid connection work.
2. The offshore wind power debugging method based on black start as claimed in claim 1, wherein in step 2, the charging current I of the collector sea cable to ground capacitor is c Is that
I c ＝jwCU N ，
Wherein C is a collector sea cable to ground charging capacitor, U N Charging power Q of current collection submarine cable to ground capacitor for system line voltage c Is that
Wherein C is l The capacitance value is charged for each kilometer of current collecting submarine cable, and l is the length of the current collecting submarine cable;
the variable load capacity parameter selection method comprises the following steps: the inductive capacity of the variable load needs to be capable of fully counteracting reactive capacity and leaving a certain margin for flexible adjustment, and the resistive capacity of the variable load needs to be capable of counteracting active power generated by a fan when the fan is connected to generate power so as to maintain active balance of the system and leave a certain margin for flexible adjustment;
the capacity parameter selection method of the diesel generating set comprises the following steps: under the allowable condition, a diesel generator set with large capacity is used as much as possible so as to ensure the success rate of wind power debugging;
the method for selecting the capacity parameters of the transformer comprises the following steps: the capacity of the transformer on the outlet side of the diesel generator set must be larger than the capacity of the diesel generator set with a certain margin, and the capacity of the transformer on the outlet side of the variable load must be configured according to the capacity of the variable load.
3. The offshore wind power debugging method based on black start as claimed in claim 1, wherein the step 3 specifically comprises the following steps:
1) Taking a diesel generator set as a power supply and a variable load as a load, and respectively carrying out a zero lifting voltage test on each main transformer and branches thereof in the booster station by using a black start system;
2) After the voltage is stabilized, the nuclear phase work of the 35kV current collection submarine cable voltage transformer, the 35kV bus voltage transformer and the 220kV bus voltage transformer is respectively completed;
3) And (5) completing the insulation inspection work of the system.
4. The method for debugging marine wind power based on black start as claimed in claim 1, wherein in the step 4, corresponding synchronous parallel devices of diesel generator sets are required to be installed in the two sets in the parallel operation process of the black start system and the diesel generator for the booster station.
5. The offshore wind power debugging method based on black start as claimed in claim 1, wherein the step 5 specifically comprises the following steps:
1) Carrying out a zero lifting pressure test on the current collecting submarine cable and the fan box transformer by using the diesel generating set, and ensuring dynamic balance of active power and reactive power of the system in the test process;
2) And after the voltage is stable, finishing the insulation inspection work of the system.
6. The offshore wind power debugging method based on black start as claimed in claim 1, wherein the step 6 specifically comprises the following steps:
1) Providing a stable debugging power supply by using a black start system, and carrying out static/dynamic debugging on fans on the current collecting sea cable one by one;
2) And after the fan is debugged, starting pre-grid-connected power generation, and dynamically adjusting the output and the variable load capacity of the diesel generator set during the period to keep the balance of active power and reactive power in the system, prevent the voltage and the frequency from greatly fluctuating and ensure the stable operation of the system.
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