CN107317341B - Method for realizing plug and play of distributed power supply connected to power distribution network - Google Patents
Method for realizing plug and play of distributed power supply connected to power distribution network Download PDFInfo
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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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
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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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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
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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Abstract
The invention provides a method for realizing plug and play of a distributed power supply connected to a power distribution network, and belongs to the technical field of power distribution networks. When the power distribution network master station monitoring system receives real-time information of accessing the distributed power supply to the power distribution network, carrying out balance analysis on the power of the whole power distribution network system; if the system power is in a balanced state, the normal operation of the power distribution network is kept; if the sum of the output power of the distributed power supply and the output power of the power distribution network power supply is smaller than the power of the important load, the output power of the power distribution network power supply is increased, and the power balance of the system and the plug-and-play of the distributed power supply are realized; if the sum of the output power of the distributed power supply and the power distribution network power supply is larger than the power of the important load, firstly putting flexible loads into the system to adjust the power balance of the whole system and the plug and play of the distributed power supply; if all the flexible loads are put into the power balance system, the power balance of the power distribution network and the plug and play of the distributed power supply are realized by further reducing the output power of the power supply of the power distribution network.
Description
Technical Field
The invention relates to a method for realizing plug and play of a distributed power supply connected to a power distribution network, and belongs to the technical field of power distribution networks.
Background
With the continuous progress of new materials and new technologies and the increasing emphasis of the country on environmental protection, Distributed power supplies (DR) based on clean and renewable energy are rapidly developing. DR is the full utilization of various forms of renewable energy sources such as solar energy, wind energy, etc. to generate or store energy, and electric vehicles, etc. to store electric energy, with distributed arrangement and relatively small capacity, while meeting the requirement of on-site load consumption, the surplus can be input into the distribution network. Since the DR often has the characteristics of randomness, volatility and variability, influences on the power distribution network such as trend direction, power quality, relay protection and the like are brought to the power distribution network due to different capacities and positions of the DR when the DR is accessed to the power distribution network, and the influences are increasingly serious under the condition that the permeability of the DR when the DR is accessed to the power distribution network is higher and higher, difficulties are brought to large-scale popularization and application of the DR, so that the DR cannot fully exert the due advantages of the DR, how to improve the convenience of accessing the DR to the power distribution network, reduce the negative influence, reduce the intervention to the DR, realize plug and play as much as possible is widely concerned by experts at home and abroad.
At present, in order to prevent the problem of power quality possibly caused by the condition that a large capacity of a distributed power supply is connected to a power distribution network, the maximum connection capacity of the distributed photovoltaic power supply is researched by taking the distributed photovoltaic power supply as an example in the prior art under the condition that the power quality of the power distribution network is allowed; aiming at the influence of the distributed power supply access to the power distribution network on the operation of power distribution network equipment, an existing student starts from the conditions of stable operation and short-circuit fault of the power distribution network respectively, and researches the limit access capacity of the distributed power supply by taking main equipment of the power distribution network as constraint conditions; in view of energy exchange between most distributed power supplies and a power distribution network by adopting an inverter or a converter, the admission capacity and the admission mode of the distributed power supplies to the power distribution network under the harmonic wave constraint are researched in documents. In addition, documents also propose that, according to the field power demand, when the DR is connected to the power distribution network, the plug and play of power is realized through the combination of standardized modules such as an inverter or a converter, the protection and the safety isolation when the DR is connected to the power distribution network are realized through the safety grid-connected equipment, and the plug and play of control and operation and maintenance are realized through the information interconnection equipment.
The research is mainly carried out on the influence of a distributed power supply on a power distribution network or the module standardization of the power of the DR access power distribution network so as to improve the capacity of the DR access power distribution network as much as possible. Because DR receives the influence of time and weather great, each index parameter is in among the continuous variation when inserting the distribution network, and power module is difficult to satisfy all power demand combinations among the practical application, and numerous power module greatly increased the work load of operation maintenance again, also can cause certain influence to the reliability of system operation to influenced DR and inserted the convenience and the practicality of distribution network, more difficult realization DR's plug-and-play.
Disclosure of Invention
In order to overcome the difficulty of accessing a distribution network by a DR (digital radio) at present, improve the permeability and the access convenience of the DR in the distribution network, reduce the operation and maintenance workload caused by accessing the DR into the distribution network, make up for the defects in the prior art and promote the large-scale application of the DR, the invention provides a method for realizing the plug and play of a distributed power supply when accessing the distribution network, so as to solve the problem that the plug and play of the distributed power supply when accessing the distribution network is difficult to realize in the prior art.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the whole framework of the power distribution network mainly comprises a power supply of the power distribution network, a bus, a distributed power supply, important loads, flexible loads, circuit breakers, lines and other equipment, and the whole system preferentially meets the power requirement of the important loads. A method for realizing plug and play of a distributed power supply connected to a power distribution network comprises the following steps:
after the distribution network master station monitoring system receives the operation information of the DR access distribution network through the data acquisition device and the communication system, the supply and demand balance analysis is carried out on the power of the whole system according to the overall operation information of the distribution network system;
if active power and reactive power of the whole power distribution network system are in a supply and demand balance state after the DR is accessed into the power distribution network system, the power distribution network system is kept to normally operate without any power regulation; otherwise, under the condition that the DR input power of the power distribution network system is not changed, the power supply and demand balance of the whole power distribution network system is realized by the following method:
if the sum of the DR and the output power of the power supply of the power distribution network is smaller than the power of the important load, under the condition of keeping the DR output power unchanged, the plug and play and the power balance of the whole system when the DR is connected into the power distribution network system are realized by increasing the output power of the power supply of the power distribution network, so that the normal operation of the power distribution network system is ensured;
if the sum of the DR and the output power of the power supply of the power distribution network is larger than the power of the important load, under the condition of keeping the DR output power unchanged, in order to improve the utilization rate of the DR, firstly, flexible loads are put into the power distribution network, and plug and play and power balance of the whole system are realized when the DR is connected into the power distribution network; if all the flexible loads are put into use, the power balance of the whole system still cannot be realized, the plug and play and the power balance of the whole system when the DR is connected into the power distribution network are further realized by reducing the output power of the power supply of the power distribution network, and the normal operation of the power distribution network system is guaranteed.
Furthermore, the plug-and-play when the DR is connected to the power distribution network means that after the power distribution network receives any DR output power, DR energy is rapidly input into the power distribution network under the condition of no intervention or intervention on the DR output power as little as possible, and if the power distribution network system power is unbalanced, supply and demand balance of the power distribution network system power is realized through other adjusting means;
furthermore, the DR transmits the running state and the output power of the equipment to a distribution network master station monitoring system through a distribution network system information communication network, and the distribution network master station monitoring system comprehensively analyzes and processes the received DR running condition information and other system information;
furthermore, the DR can be a plurality of power supplies with different output powers, a single or a plurality of power supplies can be accessed to the power distribution network system at the same time or in a time-sharing manner, the plurality of DR can be distributed or centralized, and when the energy of the DR is absorbed by local loads, the rest energy is accessed to the power distribution network;
further, the power balance analysis of the power distribution network master station monitoring system comprises active power analysis and reactive power analysis;
further, the important load is a load which has a strict demand for electric energy and a high requirement for reliability of power supply.
Further, the flexible load can be composed of a single load or a plurality of loads with different powers, the loads allow free switching and adjustment of the power of the loads in different time periods, and when the power distribution network is not connected to the distributed power supply, the flexible load is in a cold standby state, wherein the cold standby state means that the flexible load and the power distribution network system are in an unconnected standby state;
furthermore, the power distribution network master station monitoring system can simultaneously or time-divisionally switch on and off single or multiple flexible loads.
The invention has the advantages that by adjusting the flexible load and the power of the power supply of the power distribution network, on one hand, the convenience of the distributed power supply for accessing the power distribution network can be improved under the condition of not interfering or interfering the output power of the distributed power supply as little as possible, plug and play are realized, the power supply and demand balance of the whole power distribution network system is met, the influence on the power distribution network system is reduced, and the stable operation of the whole power distribution network system is ensured; on the other hand, under the condition of meeting the power requirement of important loads, the flexibility of power regulation of the whole power distribution network system and the utilization rate of new energy are improved by introducing the flexible load and utilizing the advantages of the flexible load.
Drawings
FIG. 1 is a schematic diagram of the overall architecture of a power distribution network system according to the present invention;
FIG. 2 is a schematic diagram of the overall adjustment process of the distributed power supply of the present invention in the plug and play situation when the distributed power supply is connected to the distribution network;
fig. 3 is a schematic diagram of a detailed active power regulation process in the plug and play situation of the distributed power source connected to the power distribution network.
Fig. 4 is a schematic diagram of a detailed reactive power adjustment process in the plug and play situation of the distributed power source connected to the power distribution network.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The invention provides a method for realizing plug and play of a distributed power supply connected to a power distribution network, which comprises the following steps:
after the distribution network master station monitoring system receives DR operation working conditions and operation information accessed to the distribution network through the data acquisition device and the communication system, the DR related information is combined with other information of the distribution network system, and supply and demand balance analysis is carried out on the power of the whole distribution network system according to the overall operation information of the distribution network system;
if active power and reactive power of the whole power distribution network system are in a supply and demand balance state after the DR is accessed into the power distribution network system, the power distribution network system is kept to normally operate without any power regulation; otherwise, under the condition that the DR input power of the power distribution network system is not changed, the power supply and demand balance of the whole power distribution network system is realized by the following method:
if the sum of the DR and the output power of the power supply of the power distribution network is smaller than the power of the important load, under the condition of keeping the DR output power unchanged, the plug and play and the power balance of the whole system when the DR is connected into the power distribution network system are realized by increasing the output power of the power supply of the power distribution network, so that the normal operation of the power distribution network system is ensured;
if the sum of the DR and the output power of the power supply of the power distribution network is larger than the power of the important load, under the condition of keeping the DR output power unchanged, in order to improve the utilization rate of the DR, firstly, flexible loads are put into the power distribution network, and plug and play and power balance of the whole system are realized when the DR is connected into the power distribution network; if the power balance of the whole system cannot be realized by putting all the flexible loads into the power distribution network, the plug and play and the power balance of the whole system are realized when the DR is connected into the power distribution network by further reducing the output power of the power supply of the power distribution network, and the normal operation of the power distribution network is guaranteed.
Based on the technical scheme, the following specific implementation mode is provided in combination with the attached drawings of the invention.
The method for realizing plug and play of the distributed power source when the distributed power source is connected into the power distribution network is mainly applied to the field of power distribution network systems, and under the condition that the power of the distributed power source connected into the power distribution network is not interfered or is interfered as little as possible, the plug and play of the distributed power source when the distributed power source is connected into the power distribution network is realized by adjusting the cold standby flexible load power in the power distribution network system and the output power of the power distribution network power source, and the normal operation of the power distribution network system is ensured.
1. As shown in figure 1, the overall architecture of the power distribution network mainly comprises a power distribution network power supply, a bus and a distributed power supply DR1…DRmImportant load LZ1…LZpFlexible load LR1…LRnEquipment such as circuit breaker and circuit constitutes, and the power demand of important load is satisfied with priority to whole system, and under the condition that DR does not insert the distribution network, flexible load is in cold standby.
2. When the DR is connected into the power distribution network system, the power distribution network master station monitoring system receives the relevant operation information of the DR power conversion equipment, the master station monitoring system performs supply and demand balance analysis on the power of the whole power distribution network system in combination with other operation information of the power distribution network system, and if the power supply and demand of the whole power distribution network system are balanced, the power distribution network system is kept to normally operate; otherwise, under the condition of keeping the power of the DR access power distribution network system unchanged, according to the power supply and demand state, the power supply and demand balance of the whole power distribution network system is realized by inputting and adjusting the flexible load power and the output power of the power supply of the power distribution network; the overall adjustment process is shown in fig. 2.
DR output of active power to the distribution network is regulated as follows:
when the distribution network main station monitoring system performs active power supply and demand balance analysis on the distribution network system according to the total operation information, if the DR active power of the distribution network system is accessed
Active power P output by power distribution network power supply at the momentPower distribution networkThe sum of which is equal to the active power of the important load
Namely, it is
The normal operation of the power distribution network system is kept; otherwise, under the condition of keeping the DR output active power constant, the main station monitoring system adjusts the active power of the power distribution network system according to the following method so as to realize the active power supply and demand balance of the power distribution network system and ensure the reliable operation of the power distribution network system:
1) if the sum of the DR active power accessed to the power distribution network system and the active power of the power distribution network system at the moment is less than the active power of the important load, namely
Increasing active power output by power supply of power distribution network to P'Power distribution networkSatisfy the active power balance of the power distribution network system
And meanwhile, the normal operation of the power distribution network system is ensured.
2) If the sum of the DR active power accessed to the power distribution network system and the active power of the power distribution network system at the moment is larger than the active power of the important load, the power distribution network system is connected with the power distribution network system
The master station monitoring system puts flexible load LR into the system according to the information analysis result and the active power shortage1…LRnUntil the active power balance of the power distribution network system is met
In time, the normal operation of the power distribution network system is ensured;
3) if the sum of the DR active power accessed to the power distribution network system and the active power of the power distribution network system at the moment is larger than the active power of the important load, the power distribution network system is connected with the power distribution network system
In time, the active power supply and demand balance of the power distribution network system can not be met by putting all flexible loads into the system
Further reducing the active power output by the power supply of the power distribution network to P ″'Power distribution networkRealizing the active power supply and demand balance of the power distribution network system
So as to ensure the normal and reliable operation of the power distribution network system.
The active power adjustment process is shown in fig. 3.
DR output reactive power to the distribution network is regulated as follows:
when the distribution network main station monitoring system performs reactive power supply and demand balance analysis on the distribution network system according to the total operation information, if the DR reactive power of the distribution network system is accessed
Reactive power Q output by power distribution network power supply at the momentPower distribution networkThe sum of which is equal to the reactive power of the important load
Namely, it is
The normal operation of the power distribution network system is kept; otherwise, keeping the DR output reactive power constant, and adjusting the reactive power of the power distribution network system by the master station monitoring system according to the following method so as to realize the reactive power supply and demand balance of the power distribution network system and ensure the reliable operation of the power distribution network system:
1) if the sum of the DR reactive power accessed to the power distribution network system and the reactive power of the power distribution network system at the moment is less than the reactive power of the important load, the system is used
Increasing the reactive power output by the power supply of the power distribution network to Q'Power distribution networkSatisfy the reactive power balance of the power distribution network system
And meanwhile, the normal and reliable operation of the power distribution network system is ensured.
2) If the sum of the DR reactive power accessed to the power distribution network system and the reactive power of the power distribution network system at the moment is larger than the reactive power of the important load, the system is used
The master station monitoring system puts flexible load LR into the system according to the information analysis result and the reactive power shortage1…LRnUntil the reactive power balance of the power distribution network system is met
In time, the normal and reliable operation of the power distribution network system is ensured;
3) if the sum of the DR reactive power accessed to the power distribution network system and the reactive power of the power distribution network system at the moment is larger than the reactive power of the important load, the system is used
In time, the reactive power supply and demand balance of the power distribution network system can not be met by putting all flexible loads into the system
Further reducing the reactive power output by the power supply of the power distribution network to Q'Power distribution networkTo achieve the balance of reactive power supply and demand of the distribution network system
So as to ensure the normal and reliable operation of the power distribution network system.
The reactive power adjustment process is shown in fig. 4.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (1)
1. A method for realizing plug and play of a distributed power supply connected to a power distribution network is characterized by comprising the following steps: the method comprises the following steps: after receiving the distributed power supply operation condition information, the power distribution network master station monitoring system fuses the information with other information of the power distribution network system, and performs balance analysis on the power of the whole system of the power distribution network according to the total operation information; step two: if the power of the whole power distribution network system is in a balanced state after the distributed power supply is connected to the power distribution network, the normal operation of the power distribution network is kept; otherwise, the power balance of the whole system is realized by adjusting the output power of the power distribution network or the flexible load power accessed to the power distribution network;
if the sum of the output power of the distributed power supply and the output power of the power supply of the power distribution network is smaller than the power of the important load after the distributed power supply is connected to the power distribution network, the plug and play and the power balance of the whole system when the distributed power supply is connected to the power distribution network are realized by increasing the output power of the power supply of the power distribution network;
if the sum of the output power of the distributed power supply and the output power of the power supply of the power distribution network is greater than the important load power after the distributed power supply is connected to the power distribution network, firstly, flexible loads are put into the power distribution network, and plug and play and power balance of the whole system are realized when the distributed power supply is connected to the power distribution network; if the power balance of the whole system cannot be realized by putting all the flexible loads into the power distribution network, the plug and play and the power balance of the whole system are realized when the distributed power supply is connected into the power distribution network by further reducing the output power of the power supply of the power distribution network;
the plug-and-play when the distributed power supply is connected to the power distribution network means that the power supply and demand balance of the power distribution network system can be realized by other methods under the condition that the output power of the distributed power supply is not interfered after the power distribution network receives any output power of the distributed power supply in real time;
the distributed power supply outputs energy to a power distribution network through power conversion equipment, and the power distribution network information network transmits the running state and the output power of the equipment to a power distribution network master station monitoring system;
the distributed power supply can be composed of a plurality of power supplies with different output powers and can be individually connected to a power distribution network;
the distributed power supply can be composed of a plurality of power supplies with different output powers and can be simultaneously connected to a power distribution network;
the distributed power supply can be composed of a plurality of power supplies with different output powers and can be accessed to a power distribution network in a time-sharing manner;
the important load is a load which has strict requirement on electric energy and has higher requirement on the reliability of power supply;
the flexible load allows free switching and power regulation in different time periods, and is in a cold standby state when the power distribution network is not connected with the distributed power supply;
the power distribution network master station monitoring system can simultaneously or time-divisionally switch on and off single or multiple flexible loads.
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