CN110912269B - Electric energy dispatching and controlling system for offshore power grid - Google Patents
Electric energy dispatching and controlling system for offshore power grid Download PDFInfo
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- CN110912269B CN110912269B CN201911201458.2A CN201911201458A CN110912269B CN 110912269 B CN110912269 B CN 110912269B CN 201911201458 A CN201911201458 A CN 201911201458A CN 110912269 B CN110912269 B CN 110912269B
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- 238000012544 monitoring process Methods 0.000 claims abstract description 17
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- 230000033228 biological regulation Effects 0.000 claims abstract description 9
- 238000007726 management method Methods 0.000 claims description 82
- 230000001105 regulatory effect Effects 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 claims description 6
- 238000004364 calculation method Methods 0.000 claims description 6
- 230000001276 controlling effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 claims description 6
- 238000012216 screening Methods 0.000 claims description 6
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- 230000005284 excitation Effects 0.000 claims description 3
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- 230000006855 networking Effects 0.000 description 4
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- 238000012423 maintenance Methods 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
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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
- H02J3/48—Controlling the sharing of the in-phase component
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides an offshore power grid electric energy dispatching and management control system, which comprises a basic monitoring module, an advanced control function module and an information management function module, wherein the advanced control function module specifically comprises the functions of topology analysis, hot standby management, power flow management, power management, voltage regulation, priority tripping, load suppression and the like; the information management function module comprises functions of database management, event and alarm recording, historical data trend analysis, data report and the like. The invention makes up the deficiency of the automation technology level of the offshore power grid, can effectively monitor the quality of the power grid, quickly position the fault source, avoid the disconnection of the power grid, reduce the black start and better promote the electric energy quality and the safety and stability of the offshore power grid.
Description
Technical Field
The invention relates to an offshore island power grid management control system, in particular to an offshore power grid electric energy dispatching and management control system.
Background
As the scale of the offshore power grid in China is continuously expanded, the following problems are faced: 1) The network structure is more and more complex, and the requirements on the safety and stability of the system are higher and higher; 2) The system capacity is smaller, and certain loads have larger single-machine capacity, so that when the load is started, the power grid is impacted greatly; 3) The platform working condition is frequently changed, and high requirements are put on the reliability of the automatic control device; 4) Few operating maintenance personnel, etc. At present, the research on the stability and reliability of an offshore platform power system is still deficient, and the construction of a safe, stable and efficient offshore power grid automation system is a necessary requirement for offshore power grid development, and has important significance for implementation of ocean national strategies and safe and stable operation of ocean engineering in China. The land power grid is controlled by the SCADA/EMS system to complete the power exchange of the power grid frequency and the tie line, the on-line safety and stability control system is used for completing the stability control of the power grid under the fault condition, and the comprehensive automation system of the power station is used for improving the automation level of the power station so as to reduce the configuration of operators. However, these systems are large and complex for island micro-grids such as offshore grids, which are not only costly, but also require a large number of operation maintenance personnel.
Therefore, in order to better improve the electric energy quality and the safety stability of the offshore power grid, an offshore power grid electric energy dispatching and controlling system is needed, and the functions of the system comprise monitoring and remote control of key equipment, control of a generator set, active and reactive power flow and voltage control of the power grid, on-line stable control of the power grid, hot standby allowance management of the power grid operation, comprehensive control of key loads and the like, so that the operation of the power grid can be monitored in real time, faults can be timely processed, the disconnection of the power grid can be avoided, black start is reduced, the impact resistance of the power grid is enhanced, and the automation level of the offshore power grid is improved.
Disclosure of Invention
The invention aims to provide an offshore power grid electric energy dispatching and management and control system. In order to solve the technical problems, the invention adopts the following technical scheme:
an offshore power grid power dispatching and management system, comprising:
(1) The basic monitoring function module is used for completing the acquisition and state estimation of basic data and providing effective data for the advanced control function;
(2) The advanced control function module specifically comprises functions of topology analysis, hot standby management, power flow management, power management, voltage adjustment, priority tripping, load suppression and the like;
(3) The information management function module comprises functions of database management, event and alarm recording, historical data trend analysis, data report and the like. The basic data and the pre-estimated state data acquired by the basic monitoring function module are stored in the database management module, the advanced control function module calls the data in the database management module, and the data are controlled by the topology analysis module, the hot standby management module, the power flow management module, the power management module, the voltage adjustment module, the priority tripping module and the load suppression module to output control signals to regulate and control all nodes of the offshore power grid and alarm abnormal conditions; the event and alarm recording module records the regulated event and abnormal condition alarm records; and the historical data trend analysis module analyzes the regulated event and abnormal condition alarm records, generates a data report and stores the data report in the data report module.
Further, the hot standby management is characterized in that: on the premise of determining rated parameters of each generator set, the power hot standby of the current working condition of the offshore power grid and the power hot standby of all possible assumed working conditions are calculated through monitoring the actual operation parameters of each generator and analyzing the operation working condition of the offshore power grid. The calculation formula for hot standby is as follows:
P hot standby ＝P max -P online
Wherein: p (P) Hot standby Indicating hot standby; p (P) max Representing the maximum output of the total online generator; p (P) online Indicating the total on-line generator actual output.
If P Hot standby The hot standby is sufficient and the load is not required to be unloaded, wherein the hot standby is more than or equal to 0;
if P Hot standby <0, judging: (1) If P Hot standby +offloadable load<0, indicating that hot standby + off-loadable, i.e. off-load all off-loadable, the generator will still be overloaded, taking into account that the standby generator should be started; (2) If P Hot standby The +loadable load is more than or equal to 0, the preferential tripping function is executed, and tripping is carried out according to the unloading level of the loadable load until P Hot standby ≥0。
Furthermore, the power flow management is mainly realized by adjusting P and Q of a balance bus (including a bus of a main generator), and the aim of adjusting reactive power flow can be achieved by adjusting a gear of a transformer or a reactive compensation device. The purposes of power flow management are mainly two: firstly, electric energy scheduling requirements are mainly based on requirements such as power grid energy planning, equipment switching or equipment debugging in an area and the like; and secondly, networking operation requirements are mainly based on networking and disconnection of each power station area.
Further, the power management method is characterized by comprising the following steps:
(1) Active power and reactive power distribution control, wherein the active power is distributed according to an equal proportion mode according to the actual maximum output of each generator, and the reactive power is distributed according to an on-site equal proportion mode;
(2) The method comprises the steps of controlling power demand and power factor, monitoring input/output power of a public power grid tie line in real time, calculating the power demand, and then adjusting an Automatic Voltage Regulator (AVR) to control reactive power output on the premise of meeting basic output of a generator according to the range of the power factor so as to maintain the power factor within a reasonable range;
(3) Bus frequency and voltage control, which adjusts the output active power and reactive power according to the load variation to maintain the frequency and voltage of the system.
Further, the voltage adjusting function ensures that the voltage of each node is not changed beyond a specified allowable range by adjusting the voltage of each node so as to ensure the stable level of the power system and the safe and economic operation of various power equipment and electrical appliances. The implementation manner of the voltage adjustment comprises the following steps:
(1) The voltage regulation of the generator terminal is changed, reactive power output is changed by regulating excitation, and the synchronous generator can be kept to operate at rated power within the range of 95-105% of rated voltage;
(2) When the reactive power of the power system is sufficient, the transformation ratio of the transformer is changed by selecting different taps, so that the purpose of voltage regulation is achieved;
(3) And (3) regulating the voltage of the reactive power compensation equipment, and when the reactive power in the power system is insufficient, regulating the voltage by using various reactive power compensation equipment.
Further, the priority trip function is used for emergency situations of the power grid, such as: when the generator trips, the interconnecting switch is disconnected and the line is overloaded, the load of the offshore power grid is selectively tripped according to the pre-calculation result, so that the stability of the power grid is ensured.
Further, the use condition of the load suppression function is that when a large load is started, the hot standby margin of the power grid cannot meet the impact load demand when the load is started.
Further, when a generator of the offshore power grid trips, a topology analysis functional module is adopted to analyze the node where the fault occurs, and the node with an effective working condition is screened out to serve as a power grid control basis; then triggering a power flow management module to adjust reactive power flow; then triggering a hot standby management function module to calculate hot standby, and under the condition of insufficient hot standby, starting a priority tripping function to trip part of nodes; triggering the tide management functional module again, and adjusting the active power and the reactive power of the balance bus; and starting the power flow management and voltage adjustment module to enable the active power and the reactive power of the power grid to be distributed in a required area, and triggering the power management module under the basic conditions of the power flow management function module and the voltage adjustment function module to further control the active power, the reactive power, the voltage and the frequency, so that the system is transited to a new steady-state operation state.
Compared with the prior art, the invention has the following advantages:
(1) Monitoring, control and scheduling management of different manufacturers and capacity units are realized;
(2) The problems of unattended operation and remote expert diagnosis of offshore power supply are solved;
(3) The quality of the power grid is effectively monitored, and a fault source is rapidly positioned;
(4) The safe, reliable, high-quality and economical operation of the offshore power grid is ensured.
Drawings
FIG. 1 is a functional block diagram of an offshore power grid power dispatching and management system.
Fig. 2 is a system diagram of the load rejection function module of the offshore power grid power dispatching and management system.
Figure 3 is a flow chart of the offshore grid power dispatching and management system operation in the embodiment.
Detailed Description
Specific implementations of the invention are further described below with reference to the drawings and examples, but the implementation and protection of the invention are not limited thereto.
Referring to fig. 1, a method for dispatching and controlling electric energy of an offshore power grid includes:
(1) The basic monitoring function module is used for completing the acquisition and state estimation of basic data and providing effective data for the advanced control function;
(2) The advanced control function module specifically comprises functions of topology analysis, hot standby management, power flow management, power management, voltage adjustment, priority tripping, load suppression and the like;
(3) The information management function module comprises functions of database management, event and alarm recording, historical data trend analysis, data report and the like.
The topology analysis strategy is a basis for guaranteeing the stability control of the power system, and mainly comprises the steps of determining the topology structure of the power connection of a power platform and a non-power platform, screening all possible effective working conditions of the offshore power grid, and setting preset parameters of the stability control strategy under different working conditions after the working conditions of the power grid are determined.
The topology analysis method mainly comprises the following steps:
(1) Determining a topological diagram of the offshore power grid;
(2) Numbering each platform to distinguish the power platform and the non-power platform;
(3) All permutation and combination are listed according to the number of the platform:
(4) Screening all the combinations for the first time, and judging whether a power supply node exists or not;
(5) And carrying out second screening on the combination subjected to the first screening to judge whether the correct connection relation exists.
(6) And obtaining a topological structure diagram of all effective working conditions.
For example, by setting the power stage number to uppercase letters and the non-power stage number to lowercase letters, the power stage is distinguished from the non-power stage.
If the power platform is included in the array, then the power node is considered to be present.
Only between the nodes with correct connection relation can an effective power grid be formed, namely, the effective working condition is achieved.
Further, the hot standby management is characterized in that: on the premise of defining rated parameters of each generator set, the power hot standby of the current working condition of the offshore power grid and the power hot standby of all possible assumed working conditions are calculated through monitoring the actual operation parameters of each generator and analyzing the operation working condition of the offshore power grid.
The calculation formula for hot standby is as follows:
P hot standby ＝P max -P online
Wherein: p (P) Hot standby Indicating hot standby; p (P) max Representing the maximum output of the total online generator; p (P) online Indicating the total on-line generator actual output.
If P Hot standby And the temperature is more than or equal to 0, the hot standby is sufficient, and the load does not need to be unloaded.
If P Hot standby <0, judging: (1) If P Hot standby +offloadable load<0, indicating that hot standby + off-loadable, i.e. off-load all off-loadable, the generator will still be overloaded, taking into account that the standby generator should be started; (2) If P Hot standby The +loadable load is more than or equal to 0, the preferential tripping function is executed, and tripping is carried out according to the unloading level of the loadable load until P Hot standby ≥0。
The calculation of the hot standby is a basic condition for implementing the system priority tripping function, and the system determines whether to start the priority tripping function by judging whether the hot standby is enough so as to ensure the stability of the power grid.
Furthermore, the power flow management is mainly realized by adjusting P and Q of a balance bus (including a bus of a main generator), and the aim of adjusting reactive power flow can be achieved by adjusting a gear of a transformer or a reactive compensation device. The purposes of power flow management are mainly two: firstly, electric energy scheduling requirements are mainly based on requirements such as power grid energy planning, equipment switching or equipment debugging in an area and the like; and secondly, networking operation requirements are mainly based on networking and disconnection of each power station area.
Further, the power management includes:
(1) Active power and reactive power distribution control, wherein the active power is distributed according to an equal proportion mode according to the actual maximum output of each generator, and the reactive power is distributed according to an on-site equal proportion mode;
(2) The method comprises the steps of controlling power demand and power factor, monitoring input/output power of a public power grid tie line in real time, calculating the power demand, and then adjusting an Automatic Voltage Regulator (AVR) to control reactive power output on the premise of meeting basic output of a generator according to the range of the power factor so as to maintain the power factor within a reasonable range;
(3) Bus frequency and voltage control, which adjusts the output active power and reactive power according to the load variation to maintain the frequency and voltage of the system.
Further, the voltage adjusting function ensures that the voltage of each node is not changed beyond a specified allowable range by adjusting the voltage of each node so as to ensure the stable level of the power system and the safe and economic operation of various power equipment and electrical appliances. The implementation manner of the voltage adjustment comprises the following steps:
(1) The voltage regulation of the generator terminal is changed, reactive power output is changed by regulating excitation, and the synchronous generator can be kept to operate at rated power within the range of 95-105% of rated voltage;
(2) When the reactive power of the power system is sufficient, the transformation ratio of the transformer is changed by selecting different taps, so that the purpose of voltage regulation is achieved;
(3) And (3) regulating the voltage of the reactive power compensation equipment, and when the reactive power in the power system is insufficient, regulating the voltage by using various reactive power compensation equipment.
Further, the priority trip function is used for emergency situations of the power grid, such as: when the generator trips, the interconnecting switch is disconnected and the line is overloaded, the load of the offshore power grid is selectively tripped according to the pre-calculation result, so that the stability of the power grid is ensured.
Further, the use condition of the load suppression function is that when a large load is started, the hot standby margin of the power grid cannot meet the impact load demand when the load is started.
As in fig. 2, the impact on the grid at the moment of heavy load start can be divided into active and reactive power demand. For pump loads, the active power demand is 1.5-2 times the rated power, and the reactive power demand is 6-8 times the rated power. The load suppression function should possess the data interface of the rated (active/reactive) power of heavy load, active power start multiplying power, reactive power start multiplying power isoparametric, after having put into use the load suppression function, if the hot spare capacity of the electric wire netting can not meet the impact load demand when the load starts, electric energy dispatch and management and control system will output the blocking signal, prohibit the heavy load to start.
Under the condition of normal operation of the power grid, the basic monitoring function module is used for monitoring and collecting the operation state and operation data of each device of the power grid, providing data for the advanced function control module, and simultaneously being applied to the information management function module for carrying out database management, historical data trend analysis and data report.
When the basic monitoring function module monitors that an abnormality occurs in the power grid, as shown in fig. 3, for example: the generator trips, the distribution of the power supply of the power grid is changed, and nodes with effective working conditions are screened out by adopting a topology analysis functional module to serve as a power grid control foundation. And simultaneously triggering the power flow management module and the hot standby management function module, starting a priority tripping function under the condition of insufficient hot standby, at the moment, changing the power supply and load distribution of the power grid again, triggering the power flow management function module again, adjusting the active and reactive power of the balance bus, and simultaneously, enabling the power flow management and the voltage adjustment module to be mutually influenced, so that the active power and the reactive power of the power grid are distributed in a required area, and triggering the power management module under the basic condition of the power flow management function module and the voltage adjustment function module to further control the active power, the reactive power, the voltage and the frequency, so that the system is transited to a new steady-state operation state.
Further, the system pre-calculates the grid load, for example, before a large load is started. After the load is started, the load distribution is changed, a topology analysis function module is adopted, a tide management module and a hot standby management function module are triggered at the same time, and if the hot standby is insufficient, a large load function is executed, and the starting of the large load is restrained.
Further, for example, when the state of a power grid switch is changed, the grid framework is changed, a topology analysis function module is adopted, a power flow management module is triggered at the same time, the active power and the reactive power of a balance bus are adjusted, meanwhile, the power flow management module and a voltage adjustment module are mutually influenced, so that the active power and the reactive power of the power grid are distributed in a required area, and under the basic condition of the power flow management function module and the voltage adjustment function module, the power management module is triggered to further control the active power, the reactive power, the voltage and the frequency, so that the system is transited to a new steady-state running state.
The working principle and the measuring method of the present invention have been described above by way of specific embodiments, and those skilled in the art can make appropriate changes according to the requirements without departing from the spirit and scope of the present invention, which changes fall within the scope of the claims.
Claims (8)
1. An offshore power grid power dispatching and management system, comprising:
the basic monitoring function module is used for collecting basic data of each node of the offshore power grid and estimating the state, and providing effective data for the advanced control function module;
the advanced control function module comprises a topology analysis module, a hot standby management module, a tide management module, a power management module, a voltage adjustment module, a priority tripping module and a load suppression module;
the information management function module comprises a database management module, an event and alarm recording module, a historical data trend analysis module and a data report module;
the basic data and the pre-estimated state data acquired by the basic monitoring function module are stored in the database management module, the advanced control function module calls the data in the database management module, and the data are controlled by the topology analysis module, the hot standby management module, the power flow management module, the power management module, the voltage adjustment module, the priority tripping module and the load suppression module to output control signals to regulate and control all nodes of the offshore power grid and alarm abnormal conditions; the event and alarm recording module records the regulated event and abnormal condition alarm records; the historical data trend analysis module analyzes the regulated event and abnormal condition alarm records, generates a data report and stores the data report in the data report module; the topology analysis module screens out all possible effective working conditions of the offshore power grid by determining the topology structure of the power connection of the power platform and the non-power platform, and the analysis method comprises the following steps: determining a topological diagram of the offshore power grid; numbering each platform to distinguish the power platform and the non-power platform; according to the serial numbers of the platforms, all permutation and combination are listed; screening all the combinations for the first time, judging whether power nodes exist or not, and if the power platforms are contained in the arrangement combination, considering that the power nodes exist; the combination after the first screening is screened for the second time, whether the correct connection relation exists or not is judged, and an effective power grid can be formed only between nodes with the correct connection relation, namely, the effective working condition is achieved; obtaining a topological structure diagram of all effective working conditions; the hot standby management module is used for calculating the hot standby of the power supply of the current working condition of the offshore power grid and the hot standby of the power supply of all possible hypothetical working conditions by monitoring the actual operation parameters of the generators of each node and analyzing the operation working condition of the offshore power grid on the premise of defining the rated parameters of the generator set of each node.
2. The offshore power grid power dispatching and management system of claim 1, wherein: the hot standby management module calculates a hot standby by adopting the following formula:
P hot standby ＝P max -P online
Wherein: p (P) Hot standby Indicating hot standby; p (P) max Representing the maximum output of the total online generator; p (P) online Representing the actual output of the total online generator;
if P Hot standby The hot standby is sufficient and the load is not required to be unloaded, wherein the hot standby is more than or equal to 0;
if P Hot standby <0, judging: (1) If P Hot standby +offloadable load<0, indicating that hot standby + off-loadable, i.e. off-load all off-loadable, the generator will still be overloaded, taking into account that the standby generator should be started; (2) If P Hot standby The +loadable load is more than or equal to 0, the preferential tripping function is executed, and tripping is carried out according to the unloading level of the loadable load until P Hot standby ≥0。
3. The offshore power grid power dispatching and management system of claim 1, wherein: and the power flow management module adjusts reactive power flow by adjusting active power P and reactive power Q of the balance buses of each node.
4. The offshore power grid power dispatching and management system of claim 1, wherein the power management module is configured to:
(1) Active power and reactive power distribution control, wherein the active power is distributed according to an equal proportion mode according to the actual maximum output of each generator, and the reactive power is distributed according to an on-site equal proportion mode;
(2) The method comprises the steps of controlling power demand and power factor, monitoring input/output power of a public power grid tie line in real time, calculating the power demand, and then adjusting an automatic voltage regulator to control reactive power output on the premise of meeting basic output of a generator according to the range of the power factor so as to maintain the power factor in a reasonable range;
(3) Bus frequency and voltage control, which adjusts the output active power and reactive power according to the load variation to maintain the frequency and voltage of the system.
5. The offshore power grid power dispatching and management system of claim 1, wherein: the voltage adjustment module is used for adjusting the voltage of each node to ensure that the voltage does not change beyond a specified allowable range, and comprises the following steps:
(1) Changing the voltage regulation of the generator terminal voltage, and changing reactive power output through regulating excitation;
(2) When the reactive power of the power system is sufficient, the transformation ratio of the transformer is changed by selecting different taps, so that the purpose of voltage regulation is achieved;
(3) And voltage regulation is performed by adopting reactive compensation equipment, and when the reactive power in the power system is insufficient, the voltage regulation is performed by adopting various reactive compensation equipment.
6. The offshore power grid power dispatching and management system of claim 1, wherein: and when an emergency occurs to the power grid, the preferential tripping module selectively trips the load of the offshore power grid according to a pre-calculation result so as to ensure the stability of the power grid.
7. Offshore power grid power dispatching and management system according to any of the preceding claims, wherein: when a large load is started, a hot standby management module is adopted to calculate whether hot standby allowance of a power grid meets impact load requirements during load starting, and if not, a load suppression module is started, so that the large load is suppressed.
8. The offshore power grid power dispatching and management system of claim 7, wherein: when a generator of the offshore power grid trips, a topology analysis functional module is firstly applied to analyze nodes with faults, and nodes with effective working conditions are screened out to serve as a power grid control basis; then triggering a power flow management module to adjust reactive power flow; then touching a hot standby management function module to calculate hot standby;
under the condition of insufficient hot standby, a priority tripping function is started to trip part of nodes; triggering the tide management functional module again, and adjusting the active power and the reactive power of the balance bus; and starting the power flow management and voltage adjustment module to enable the active power and the reactive power of the power grid to be distributed in a required area, and triggering the power management module under the basic conditions of the power flow management function module and the voltage adjustment function module to further control the active power, the reactive power, the voltage and the frequency, so that the system is transited to a new steady-state operation state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911201458.2A CN110912269B (en) | 2019-11-29 | 2019-11-29 | Electric energy dispatching and controlling system for offshore power grid |
Applications Claiming Priority (1)
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101951025A (en) * | 2010-08-19 | 2011-01-19 | 中国海洋石油总公司 | Energy management system of offshore grid |
| CN202150132U (en) * | 2011-02-28 | 2012-02-22 | 深圳市行健自动化系统有限公司 | Electrical network power station scheduling system |
| CN203193265U (en) * | 2012-12-06 | 2013-09-11 | 深圳市欧亚特电器设备有限公司 | A power grid preferential trip control device |
| CN103595127A (en) * | 2013-09-18 | 2014-02-19 | 中国海洋石油总公司 | Intelligent control method and intelligent control system for offshore petroleum platform power grid |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951025A (en) * | 2010-08-19 | 2011-01-19 | 中国海洋石油总公司 | Energy management system of offshore grid |
| CN202150132U (en) * | 2011-02-28 | 2012-02-22 | 深圳市行健自动化系统有限公司 | Electrical network power station scheduling system |
| CN203193265U (en) * | 2012-12-06 | 2013-09-11 | 深圳市欧亚特电器设备有限公司 | A power grid preferential trip control device |
| CN103595127A (en) * | 2013-09-18 | 2014-02-19 | 中国海洋石油总公司 | Intelligent control method and intelligent control system for offshore petroleum platform power grid |
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