CN111668885A - Energy storage planning method for improving characteristics of alternating current and direct current hybrid power system - Google Patents
Energy storage planning method for improving characteristics of alternating current and direct current hybrid power system Download PDFInfo
- Publication number
- CN111668885A CN111668885A CN202010589194.9A CN202010589194A CN111668885A CN 111668885 A CN111668885 A CN 111668885A CN 202010589194 A CN202010589194 A CN 202010589194A CN 111668885 A CN111668885 A CN 111668885A
- Authority
- CN
- China
- Prior art keywords
- energy storage
- capacity
- storage configuration
- current
- direct current
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
- H02J4/00—Circuit arrangements for mains or distribution networks not specified as ac or dc
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The application provides an energy storage planning method for improving characteristics of an alternating current-direct current hybrid power system, which comprises the following steps: calculating the energy storage configuration capacity based on the emergency active power support aiming at the single feed-in direct current system; performing dynamic reactive compensation-based energy storage distribution and capacity optimization on the power grid side based on the energy storage configuration capacity measurement and calculation result supported by the emergency active power; obtaining an energy storage configuration capacity optimization result of each direct current line; and comprehensively measuring and calculating the energy storage configuration capacity of the multi-feed-in direct current system based on the energy storage configuration capacity optimization result of each direct current line to obtain the optimal energy storage configuration range for improving the fault recovery characteristic of the alternating current and direct current hybrid operation system. The method can reasonably configure the energy storage capacity, improve the fault recovery characteristic of the AC/DC hybrid power system, improve the stable operation capacity of the system, give consideration to other system requirements of the power system such as peak regulation, frequency modulation and new energy consumption, and provide theoretical and data support for the power grid side energy storage planning and the expected development scale of the regional power grid.
Description
Technical Field
The invention relates to the technical field of power grids, in particular to an energy storage planning method for improving characteristics of an alternating current-direct current hybrid power system.
Background
With the continuous development of domestic high-voltage direct-current transmission technology and the continuous propulsion of direct-current transmission engineering, an alternating-current and direct-current hybrid power system provides a new challenge for the stable operation of the system. Particularly, in a multi-feed direct current alternating current power system, the mutual influence between the two in the operation process is more obvious. For example, a fault in the ac line may cause a phase change failure in multiple dc lines at the same time, which may in turn cause a transient voltage instability in the ac system, or even cause a dc blocking in the ac system.
The prior art for improving the hybrid operation characteristics of an alternating current and direct current power system mainly adopts an active support scheme and a reactive compensation scheme. In the aspect of active support, the influences of high-power active vacancy caused by direct current blocking on system stability are reduced mainly by means of load shedding, local power supply support, power transfer to an alternating current power transmission channel and the like, but with the increase of the direct current feed-in quantity and capacity scale, the pressure drop of the direct current blocking on the active support of the alternating current system is greatly increased, and the risk of system instability is further improved. In the reactive power compensation aspect, currently, devices such as a phase modulator, a Static Var Compensator (SVC), a Static synchronous Compensator (STATCOM) and the like are mainly used for performing dynamic reactive power compensation.
However, a part of the prior art schemes are difficult to meet a great deal of requirements on active power and reactive power of the system after direct current faults, and are difficult to effectively inhibit system frequency drop; in part of the prior art schemes, the overlapping of various gains in different degrees is not considered, a plurality of invisible gains are difficult to accurately and quantitatively calculate, and the energy storage configuration capacity taking economic benefits as a target is difficult to meet the actual requirement of an alternating current-direct current hybrid operation power system in view of the current energy storage cost; in some prior art schemes, a mode of batch load shedding is adopted to balance the system power after the dc blocking, and although an accurate load shedding control strategy is provided on the basis of the original load shedding to reduce the unnecessary load shedding amount, the prior art schemes still need to stop supplying power to part of the loads after the dc blocking, thereby reducing the power supply reliability of users. Therefore, from the whole view, the prior art has not yet formed an effective improvement measure for the fault operation characteristics of the ac/dc power system which combines active support and reactive compensation.
Disclosure of Invention
The invention aims to provide an energy storage planning method for improving characteristics of an alternating current-direct current hybrid power system, energy storage capacity is reasonably configured, fault recovery characteristics of the alternating current-direct current hybrid power system are effectively improved, stable operation capacity of the system is improved, other system requirements such as peak regulation and frequency modulation and new energy consumption of the power system are considered, and key theories and data support are provided for power grid side energy storage planning and expected development scale of a regional power grid.
Based on this, the invention provides an energy storage planning method for improving characteristics of an alternating current-direct current hybrid power system, which comprises the following steps:
calculating the energy storage configuration capacity based on the emergency active power support aiming at the single feed-in direct current system; performing power grid side energy storage distribution and capacity optimization based on dynamic reactive power compensation according to the energy storage configuration capacity measurement and calculation result based on the emergency active power support to obtain an energy storage configuration capacity optimization result of the direct current line;
and comprehensively measuring and calculating the energy storage configuration capacity of the multi-feed-in direct current system according to the energy storage configuration capacity optimization result of each direct current line to obtain the optimal energy storage configuration range for improving the fault recovery characteristic of the alternating current and direct current hybrid operation system.
Preferably, the calculating is based on the energy storage configuration capacity of the emergency active power support, and includes:
calculating the energy storage configuration capacity based on the emergency active power support;
and according to the calculation result of the energy storage configuration capacity supported based on the emergency active power, carrying out simulation measurement on the energy storage capacity at the power grid side to obtain the optimal energy storage capacity under the direct current blocking fault.
Preferably, the calculating is based on the energy storage configuration capacity of the emergency active power support, and includes:
energy storage configuration capacity S based on emergency active power supportbess_calThe calculation formula of (2) is as follows:
in the formula, PdcIndicating the rated capacity, k, of the blocked DC currentaciAnd PaciRespectively representing the residual power coefficient and rated transmission capacity, k, of the alternating current transmission channel outside the ith zonegeniAnd PgeniAnd respectively representing the surplus power generation coefficient and the rated installed capacity of the power supply in the region.
According to the situation of single-feed direct current blocking or multi-feed direct current simultaneous blocking with high coupling degree in an alternating current and direct current hybrid power system, factors of the transmission capacity of an existing external alternating current transmission channel, the emergency active power supporting capacity of an internal power supply and load shedding capacity are considered when the energy storage configuration capacity based on emergency active power supporting is calculated, so that load shedding is avoided as a basic principle, the aim of relieving the operation pressure of power transmission and transformation equipment is combined, and according to the actual operation condition of the power system in a summer large operation mode, the emergency active power regulation space of the system after direct current blocking is calculated, and the preliminarily calculated estimated scale of the power grid side energy storage is obtained. The active supporting capacity of the power system is weakest in the summer large operation mode, so that the energy storage capacity requirement in the worst case can be calculated through the calculation formula, and the power system can be better suitable for other operation modes.
Preferably, the simulation determination of the energy storage capacity at the grid side according to the calculation result of the energy storage configuration capacity supported based on the emergency active power includes:
adjusting the calculation result of the energy storage configuration capacity based on the emergency active power support according to different proportions, then accessing the calculation result into the power system in a grading manner, and performing direct-current blocking fault transient simulation in power system simulation software BPA; under the condition of energy storage access with different capacities, the improvement effect of the recovery characteristic of the frequency curve of the power system is judged from the aspects of the lowest frequency, the low-frequency duration and the frequency recovery speed.
Preferably, the energy storage configuration capacity measurement and calculation result based on the emergency active power support is used for grid-side energy storage distribution and capacity optimization based on dynamic reactive power compensation, and the method includes:
carrying out BPA transient simulation on the direct-current commutation failure condition of the alternating-current and direct-current power system when the energy storage is not accessed;
calculating the ratio of the minimum voltage to the normal voltage of each 500kV node bus;
taking a 500kV node with the ratio of the minimum voltage/normal voltage being less than 0.9 as an energy storage layout alternative point;
analyzing the operating pressure of each 220kV transformer substation under the alternative points of the energy storage layout one by one, and calculating the energy storage configuration requirement;
analyzing the energy storage construction conditions of each 220kV transformer substation under the alternative points of the energy storage layout one by one, and counting energy storage construction spaces;
integrating to obtain a 500kV node energy storage distributable capacity range by taking the energy storage construction space as an upper limit and the energy storage configuration requirement as a lower limit;
configuring a capacity S based on the stored energybess_calComprehensively considering the influence degree of each 500kV node on the voltage of the converter bus and the range of the energy storage distributable capacity, and distributing the energy storage capacity;
carrying out BPA transient simulation on the direct-current commutation failure condition of the alternating-current and direct-current power system after the energy storage access;
according to the improvement condition of the 'minimum voltage/normal voltage' ratio of each node after the energy storage access, small-scale up-and-down adjustment is carried out on the basis of the original energy storage configuration;
and comparing the improvement effect of the commutation bus voltage in the commutation failure recovery process and the effect of avoiding commutation failure before and after the energy storage configuration, and comparing the voltage index after the energy storage configuration with the expected set voltage index to evaluate the effectiveness of the energy storage layout scheme.
When the energy storage configuration capacity measurement result based on the emergency active power support is used for reactive power compensation, a sufficient bus voltage support effect can be achieved, but the energy storage configuration capacity measurement result needs to be distributed to different transformer substation nodes when a large-scale energy storage access system is used, and the bus voltage support effect of a converter station is different due to the energy storage access of the different nodes. Therefore, energy storage distribution planning is carried out by combining the support effect of the energy storage on the bus voltage, the operation pressure of the transformer substation of each voltage class, the energy storage construction condition and other conditions, and meanwhile, the energy storage configuration capacity is optimized and adjusted in a small scale according to the voltage support effect of the actual distribution; the alternating current and direct current running characteristics can be effectively improved, when direct current commutation fails, the energy storage provides rapid dynamic reactive compensation for the system, and the effects of supporting the bus voltage and improving the voltage recovery process are achieved.
Preferably, the comprehensively measuring the energy storage configuration capacity of the multi-feed dc system based on the energy storage configuration capacity measurement result of each single-feed dc system includes:
superposing the energy storage configuration capacity optimization results of the single-feed direct-current systems to obtain a full-area energy storage configuration initial value;
configuring the energy storage capacity of each 500kV transformer substation according to the all-region energy storage configuration initial value;
performing transient simulation on the configuration result of the energy storage capacity of each 500kV transformer substation;
and carrying out comparative analysis on the transient simulation result to obtain an optimal energy storage configuration range.
Preferably, the configuring the energy storage capacity of each 500kV substation according to the full-region energy storage configuration initial value includes:
and successively reducing and updating the energy storage configuration capacity of all the 500kV transformer substations according to a fixed proportion value.
Preferably, the comparing and analyzing the transient simulation result to obtain an optimal energy storage configuration range includes: establishing a data set for storing the current configuration capacity, the optimal capacity and the suboptimal capacity of the energy storage configuration of each transformer substation;
when transient simulation is carried out by using the current energy storage configuration capacity, if the configuration effect of the current configuration capacity of the energy storage configuration of each substation is superior to the corresponding configuration effect in the data set with the optimal capacity or the data set with the suboptimal capacity, replacing the data set with the optimal capacity or the data set with the suboptimal capacity by using the current configuration capacity, and updating the replaced data set with the optimal capacity and the data set with the suboptimal capacity; otherwise, the data set with the optimal capacity and the data set with the suboptimal capacity are not updated.
Preferably, the comparing and analyzing the transient simulation result to obtain an optimal energy storage configuration range includes:
and comparing and analyzing the improvement effect of the fault recovery characteristic of the alternating current and direct current hybrid operation system under different energy storage configuration capacities to obtain the optimal energy storage configuration range for improving the fault recovery characteristic of the alternating current and direct current hybrid operation system.
According to the technical scheme, the method has the following advantages:
according to the energy storage planning method for improving the characteristics of the alternating current-direct current hybrid power system, the dynamic active support and reactive compensation capacity of the power system are enhanced by reasonably configuring the energy storage capacity at the power grid side; according to the situation of single-feed direct current blocking or simultaneous multi-feed direct current blocking with high coupling degree, the active transmission capacity of a cross-region alternating current transmission channel, the active support capacity of a power supply in a region, the load shedding capacity in the region after blocking and the like are considered, and the expected scale of the energy storage at the side of the power grid is preliminarily calculated. Further, the improvement effect of different energy storage capacity configurations on the frequency recovery characteristic of the system is analyzed by performing simulation on the direct current latch, and the energy storage capacity optimization space under the current situation is determined. On the basis, an energy storage access point and capacity optimization simulation measurement and calculation mode is adopted, the effects of accessing energy storage on improving the direct current receiving end commutation failure recovery process and inhibiting the direct current commutation failure are analyzed, and the optimal energy storage access point and the optimal configuration capacity are provided. Finally, considering the mutual influence factors among the multi-feed-in direct current drop points, optimizing and integrating the energy storage capacity configuration and the point distribution requirements under various direct current fault conditions to obtain an optimal energy storage planning scheme for improving the characteristics of the alternating current and direct current hybrid power system, effectively improving the recovery characteristics of the alternating current and direct current hybrid power system in the fault processes of direct current commutation failure, direct current blocking and the like, and improving the stable operation capacity of the system; besides, the peak regulation and frequency modulation of the power system, new energy consumption and other system requirements are considered, the economic benefit and the battery utilization rate of electrochemical energy storage are improved, and the flexible regulation and control performance of the grid-side energy storage in the power system is fully exerted; meanwhile, key theories and data support are effectively provided for the power grid side energy storage planning and the expected development scale of the regional power grid.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a flowchart of an energy storage planning method for improving characteristics of an ac/dc hybrid power system according to the present application;
fig. 2 is a schematic diagram of a power grid side energy storage function location provided by the present application;
fig. 3 is a flowchart of a method for calculating an energy storage configuration capacity based on an emergency active power support according to the present application;
fig. 4 is a flowchart of a power grid side energy storage distribution and capacity optimization method based on dynamic reactive compensation according to the present application;
fig. 5 is a flowchart of a method for comprehensively measuring the energy storage configuration capacity of the multi-feed dc system provided in the present application;
fig. 6 is a flowchart of an energy storage planning method for improving characteristics of an ac/dc hybrid power system according to another embodiment of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Specifically, an embodiment of the present application provides an energy storage planning method for improving characteristics of an ac/dc hybrid power system, please refer to fig. 1, where the method includes:
step S1: considering the function positioning of the grid side energy storage in the direct current power system, and calculating the energy storage configuration capacity based on the emergency active power support aiming at the single feed-in direct current system; performing power grid side energy storage distribution and capacity optimization based on dynamic reactive power compensation according to the energy storage configuration capacity measurement and calculation result based on the emergency active power support to obtain an energy storage configuration capacity optimization result of the direct current line;
step S2: and comprehensively measuring and calculating the energy storage configuration capacity of the multi-feed-in direct current system according to the energy storage configuration capacity optimization result of each direct current line to obtain the optimal energy storage configuration range for improving the fault recovery characteristic of the alternating current and direct current hybrid operation system.
In this embodiment, please refer to fig. 2, the functional positioning considering the grid-side energy storage in the dc power system includes:
the method comprises the following steps that power grid side energy storage is applied to improving the operation characteristics of an alternating current-direct current hybrid power system, the main aims of improving the recovery characteristics of the alternating current-direct current hybrid power system in the fault processes of direct current commutation failure, direct current blocking and the like and improving the stable operation capacity of the system are taken as the main targets, and the dynamic active support and reactive compensation capacity of the power system are enhanced by configuring the power grid side energy storage; meanwhile, the energy storage at the side of the power grid is accessed, so that the requirements of other systems such as peak regulation and frequency modulation, new energy consumption and the like can be effectively met, and the flexible regulation and control performance of the energy storage at the side of the power grid in the power system can be fully exerted. The system has a large demand on energy storage capacity in an application scene of improving the running characteristics of an alternating current and direct current hybrid power system, and can basically cover the demands of other functional scenes, such as peak and frequency regulation, voltage regulation, standby, black start and partial new energy consumption, so that the capacity configuration of the power system takes the alternating current and direct current application scene as a calculation basis, a regional power grid side energy storage capacity layout planning scheme is provided, and the calculated energy storage distribution point and energy storage capacity result can also take other application scenes into consideration.
In this embodiment, the calculating the energy storage configuration capacity based on the emergency active power support, please refer to fig. 3, which includes:
step S11: calculating the energy storage configuration capacity based on the emergency active power support;
step S12: and according to the calculation result of the energy storage configuration capacity supported based on the emergency active power, carrying out simulation measurement on the energy storage capacity at the power grid side to obtain the optimal energy storage capacity under the direct current blocking fault.
In order to ensure the stable operation capability of a system of an electric power system after direct current blocking, measures such as multiple direct current lifting, pump switching of a pumped storage power station and the like are generally adopted to balance power loss of a power grid in the prior art, but the frequency drop of the power grid is still not enough to be inhibited when direct current is in serious failure, and load switching measures are required to be adopted to further balance the lost power in emergency situations. Therefore, the technical scheme of the application adopts the mode of accessing the energy storage power station at the power grid node, relies on the quick response and the power supporting capacity of energy storage, promotes the flexible adjusting capacity of the system under the condition of high-power shortage after direct current blocking, and inhibits the frequency drop of the system. Comprehensively considering factors such as the transmission capacity of an existing off-area alternating current transmission channel, the emergency active power supporting capacity of an in-area power supply, the load shedding capacity and the like, and obtaining an approximate reference range of the energy storage configuration capacity through theoretical calculation; and then simulating the energy storage access capacity under the direct current blocking fault by power system simulation software BPA, and optimizing and adjusting the energy storage configuration capacity according to different severity degrees of the fault test and the improvement effect of the system frequency recovery process.
In this embodiment, the calculating the energy storage configuration capacity based on the emergency active power support includes:
according to the condition of single-feed direct current blocking or multi-feed direct current simultaneous blocking with high coupling degree in the alternating current and direct current hybrid power system, the transmission capacity of an existing off-area alternating current transmission channel, the emergency active power supporting capacity of an in-area power supply and negative power are considered when the energy storage configuration capacity based on emergency active power support is calculatedAnd calculating the emergency active power regulation space of the system after direct current blocking according to the actual running condition of the power system in a summer large running mode by taking the load removal avoiding factor as a basic principle and combining the aim of relieving the running pressure of the power transmission and transformation equipment to obtain the preliminarily calculated predicted scale of the energy storage at the power grid side. In the summer large operation mode, the active support capacity of the power system is the weakest, so that the energy storage configuration capacity based on the emergency active power support is calculated according to the summer large operation mode, the energy storage capacity requirement under the worst condition can be calculated through the calculation formula, and the calculation result of the energy storage capacity can adapt to other operation modes. Energy storage configuration capacity S based on emergency active power supportbess_calThe calculation formula of (2) is as follows:
in the formula, PdcIndicating the rated capacity, k, of the blocked DC currentaciAnd PaciRespectively representing the residual power coefficient and rated transmission capacity, k, of the alternating current transmission channel outside the ith zonegeniAnd PgeniAnd respectively representing the surplus power generation coefficient and the rated installed capacity of the power supply in the region.
In this embodiment, the performing simulation measurement on the energy storage capacity at the power grid side according to the calculation result of the energy storage configuration capacity supported based on the emergency active power to obtain the optimal energy storage capacity under the dc blocking fault includes:
adjusting the calculation result of the energy storage configuration capacity based on the emergency active power support according to different proportions, then accessing the calculation result into the power system in a grading manner, and performing direct-current blocking fault transient simulation in power system simulation software BPA; under the condition of energy storage access with different capacities, the improvement effect of the recovery characteristic of the frequency curve of the power system is judged from the aspects of lowest frequency, low-frequency duration and frequency recovery speed, and the optimal energy storage capacity under the current direct-current blocking fault is obtained.
In this embodiment, the energy storage configuration capacity measurement and calculation result based on emergency active power support is used to perform power grid side energy storage distribution and capacity optimization based on dynamic reactive power compensation, as shown in fig. 4, including:
step S201: carrying out BPA transient simulation on the direct-current commutation failure condition of the alternating-current and direct-current power system when the energy storage is not accessed;
step S202: calculating the ratio of the minimum voltage to the normal voltage of each 500kV node bus;
step S203: taking a 500kV node with the ratio of the minimum voltage/normal voltage being less than 0.9 as an energy storage layout alternative point;
step S204: analyzing the operating pressure of each 220kV transformer substation under the alternative points of the energy storage layout one by one, and calculating the energy storage configuration requirement;
step S205: analyzing the energy storage construction conditions of each 220kV transformer substation under the alternative points of the energy storage layout one by one, and counting energy storage construction spaces;
step S206: integrating to obtain a 500kV node energy storage distributable capacity range by taking the energy storage construction space as an upper limit and the energy storage configuration requirement as a lower limit;
step S207: configuring a capacity S based on the stored energybess_calComprehensively considering the influence degree of each 500kV node on the voltage of the converter bus and the range of the energy storage distributable capacity, and distributing the energy storage capacity;
step S208: carrying out BPA transient simulation on the direct-current commutation failure condition of the alternating-current and direct-current power system after the energy storage access;
step S209: according to the improvement condition of the 'minimum voltage/normal voltage' ratio of each node after the energy storage access, small-scale up-and-down adjustment is carried out on the basis of the original energy storage configuration;
step S210: and comparing the improvement effect of the commutation bus voltage in the commutation failure recovery process and the effect of avoiding commutation failure before and after the energy storage configuration, and comparing the voltage index after the energy storage configuration with the expected set voltage index to evaluate the effectiveness of the energy storage layout scheme.
Compared with the direct current faults such as direct current blocking and the like, the frequency of the direct current commutation failure is higher. The direct current commutation failure usually occurs in a conventional direct current receiving end converter station, and the main reason is that the voltage of a commutation bus falls or is distorted, which can be caused by an alternating current side line fault. In the process of commutation failure, continuous commutation failure is more likely to cause direct current blocking along with different degrees of direct current transmission power reduction. The commutation failure recovery process requires the system to provide a large amount of reactive compensation to support bus voltage recovery. Therefore, in a scene of improving the operation characteristics of the alternating-current and direct-current hybrid power system, the other function of the energy storage is to provide rapid dynamic reactive compensation at the moment of direct-current commutation failure, and the effects of supporting the bus voltage and improving the voltage recovery process are achieved. When the energy storage capacity measurement result based on the emergency active power support is used for reactive power compensation, a sufficient bus voltage support effect can be achieved, but large-scale energy storage access needs to be distributed to different substation nodes, and the bus voltage support effect of the converter station due to different node energy storage access is different. Therefore, the energy storage distribution point planning is carried out according to the conditions such as the support effect of the energy storage on the bus voltage, the operation pressure of the transformer substation with each voltage class, the energy storage construction conditions and the like, and meanwhile, the energy storage capacity is optimized and adjusted in a small scale according to the voltage support effect of the actual energy storage distribution point.
In this embodiment, the comprehensively measuring the energy storage configuration capacity of the multi-feed dc system based on the energy storage configuration capacity measurement result of each single-feed dc system includes:
superposing the energy storage configuration capacity optimization results of the single-feed direct-current systems to obtain a full-area energy storage configuration initial value;
configuring the energy storage capacity of each 500kV transformer substation according to the all-region energy storage configuration initial value;
performing transient simulation on the configuration result of the energy storage capacity of each 500kV transformer substation;
and carrying out comparative analysis on the transient simulation result to obtain an optimal energy storage configuration range.
In this embodiment, the configuring, according to the full-area energy storage configuration initial value, the energy storage capacity of each 500kV substation includes:
and successively reducing and updating the energy storage configuration capacity of all the 500kV transformer substations according to a fixed proportion value.
In this embodiment, the comparing and analyzing the transient simulation result to obtain an optimal energy storage configuration range includes: establishing a data set for storing the current configuration capacity, the optimal capacity and the suboptimal capacity of the energy storage configuration of each transformer substation;
when transient simulation is carried out by using the current energy storage configuration capacity, if the configuration effect of the current configuration capacity of the energy storage configuration of each substation is superior to the corresponding configuration effect in the data set with the optimal capacity or the data set with the suboptimal capacity, replacing the data set with the optimal capacity or the data set with the suboptimal capacity by using the current configuration capacity, and updating the replaced data set with the optimal capacity and the data set with the suboptimal capacity; otherwise, the data set with the optimal capacity and the data set with the suboptimal capacity are not updated.
In this embodiment, the comparing and analyzing the transient simulation result to obtain an optimal energy storage configuration range includes:
and comparing and analyzing the improvement effect of the fault recovery characteristic of the alternating current and direct current hybrid operation system under different energy storage configuration capacities to obtain the optimal energy storage configuration range for improving the fault recovery characteristic of the alternating current and direct current hybrid operation system.
Further, the comprehensive determination of the energy storage configuration capacity of the multi-feed dc system based on the energy storage configuration capacity measurement and calculation results of each single-feed dc system is described with reference to fig. 5, and the specific steps include:
step S301: a, B two data sets are established, wherein A is an energy storage capacity data set with the optimal system improvement effect, and B is a suboptimal energy storage capacity data set;
step S302: the input i is 1, and k is 10;
step S303: measuring and calculating ith direct current energy storage configuration capacity Sbess_i；
Step S304: judging whether i is smaller than the total number n of the direct currents; if yes, go to step S305; if not, executing step S306;
step S305: i is i + 1; and performs step S33;
step S306: calculating initial set S of all-region energy storage configuration capacitytotal_ini＝[Sbess_1，…，Sbess_n]；
Step S307: energy storage capacity S under each transformer substation is adjusted in equal proportionbess_i＝(100-k)％*Sbess_i；
Step S308: updating energy storage capacity in BPA, and performing transient simulation fault scanning;
step S309: if Stotal_iniThe energy storage configuration effect of the system is better than that of A or B, and A or B is updated;
step S310: judging whether 100-k is larger than 0; if yes, go to step S311; if not, go to step S312;
step S311: k is k + 10; and performs step S36;
step S312: aiming at an alternating current and direct current application scene, the optimal energy storage configuration capacity range of the region is between A and B;
step S313: and further, the energy storage distribution is adjusted in a small scale to improve the lifting effect of the energy storage on the power system.
Referring to fig. 6, the present embodiment provides an energy storage planning method for improving characteristics of an ac/dc hybrid power system, including:
step S41: determining a calculation net rack and an operation mode;
step S42: simulating a direct current locking condition to carry out energy storage and volume fixing;
the initial framing of the energy storage capacity needs to consider the provincial AC channel power transmission capacity, the provincial active power supporting capacity and the DC blocking load shedding capacity;
step S43: determining an energy storage capacity configuration space according to the improved frequency recovery characteristic;
step S44: simulating the direct current commutation failure condition to perform energy storage point distribution and capacity optimization;
the main indexes of energy storage distribution and capacity optimization comprise: the bus voltage recovery characteristic is improved, the drop of direct current transmission power is restrained, and the arc extinguishing angle of the inversion side during the fault period is improved.
Step S45: judging whether an untested line exists or not; if there is an untested line, go to step S46; if there is no untested dc line, go to step S47;
step S46: replacing the untested direct current line for measurement and calculation, and executing the step S42;
step S47: and (4) synthesizing all the direct current test results to determine an energy storage planning scheme.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (9)
1. An energy storage planning method for improving characteristics of an alternating current-direct current hybrid power system is characterized by comprising the following steps:
calculating the energy storage configuration capacity based on the emergency active power support aiming at the single feed-in direct current system; performing power grid side energy storage distribution and capacity optimization based on dynamic reactive power compensation according to the energy storage configuration capacity measurement and calculation result based on the emergency active power support to obtain an energy storage configuration capacity optimization result of the direct current line;
and comprehensively measuring and calculating the energy storage configuration capacity of the multi-feed-in direct current system according to the energy storage configuration capacity optimization result of each direct current line to obtain the optimal energy storage configuration range for improving the fault recovery characteristic of the alternating current and direct current hybrid operation system.
2. The method according to claim 1, wherein the calculating of the energy storage configuration capacity based on the emergency active power support comprises:
calculating the energy storage configuration capacity based on the emergency active power support;
and according to the calculation result of the energy storage configuration capacity supported based on the emergency active power, carrying out simulation measurement on the energy storage capacity at the power grid side to obtain the optimal energy storage capacity under the direct current blocking fault.
3. The method according to claim 2, wherein the calculating of the energy storage configuration capacity based on the emergency active power support comprises:
energy storage configuration capacity S based on emergency active power supportbess_calThe calculation formula of (2) is as follows:
in the formula, PdcIndicating the rated capacity, k, of the blocked DC currentaciAnd PaciRespectively representing the residual power coefficient and rated transmission capacity, k, of the alternating current transmission channel outside the ith zonegeniAnd PgeniAnd respectively representing the surplus power generation coefficient and the rated installed capacity of the power supply in the region.
4. The method according to claim 2, wherein the simulation measurement of the grid-side energy storage capacity according to the calculation result of the emergency active power support-based energy storage configuration capacity includes:
adjusting the calculation result of the energy storage configuration capacity based on the emergency active power support according to different proportions, then accessing the calculation result into the power system in a grading manner, and performing direct-current blocking fault transient simulation in power system simulation software BPA; under the condition of energy storage access with different capacities, the improvement effect of the recovery characteristic of the frequency curve of the power system is judged from the aspects of the lowest frequency, the low-frequency duration and the frequency recovery speed.
5. The method according to claim 3, wherein the dynamic reactive compensation-based grid-side energy storage distribution and capacity optimization based on the energy storage configuration capacity measurement result of the emergency active power support comprises:
carrying out BPA transient simulation on the direct-current commutation failure condition of the alternating-current and direct-current power system when the energy storage is not accessed;
calculating the ratio of the minimum voltage to the normal voltage of each 500kV node bus;
taking a 500kV node with the ratio of the minimum voltage/normal voltage being less than 0.9 as an energy storage layout alternative point;
analyzing the operating pressure of each 220kV transformer substation under the alternative points of the energy storage layout one by one, and calculating the energy storage configuration requirement;
analyzing the energy storage construction conditions of each 220kV transformer substation under the alternative points of the energy storage layout one by one, and counting energy storage construction spaces;
integrating to obtain a 500kV node energy storage distributable capacity range by taking the energy storage construction space as an upper limit and the energy storage configuration requirement as a lower limit;
configuring a capacity S based on the stored energybess_calComprehensively considering the influence degree of each 500kV node on the voltage of the converter bus and the range of the energy storage distributable capacity, and distributing the energy storage capacity;
carrying out BPA transient simulation on the direct-current commutation failure condition of the alternating-current and direct-current power system after the energy storage access;
according to the improvement condition of the 'minimum voltage/normal voltage' ratio of each node after the energy storage access, small-scale up-and-down adjustment is carried out on the basis of the original energy storage configuration;
and comparing the improvement effect of the commutation bus voltage in the commutation failure recovery process and the effect of avoiding commutation failure before and after the energy storage configuration, and comparing the voltage index after the energy storage configuration with the expected set voltage index to evaluate the effectiveness of the energy storage layout scheme.
6. The method according to claim 1, wherein the comprehensive measurement of the energy storage configuration capacity of the multi-feed dc system based on the energy storage configuration capacity estimation result of each single-feed dc system comprises:
superposing the energy storage configuration capacity optimization results of the single-feed direct-current systems to obtain a full-area energy storage configuration initial value;
configuring the energy storage capacity of each 500kV transformer substation according to the all-region energy storage configuration initial value;
performing transient simulation on the configuration result of the energy storage capacity of each 500kV transformer substation;
and carrying out comparative analysis on the transient simulation result to obtain an optimal energy storage configuration range.
7. The energy storage planning method for improving characteristics of the alternating-current and direct-current hybrid power system according to claim 6, wherein the configuring the energy storage capacity of each 500kV substation according to the full-region energy storage configuration initial value comprises:
and successively reducing and updating the energy storage configuration capacity of all the 500kV transformer substations according to a fixed proportion value.
8. The method according to claim 6, wherein the comparing and analyzing the transient simulation result to obtain an optimal energy storage configuration range comprises:
establishing a data set for storing the current configuration capacity, the optimal capacity and the suboptimal capacity of the energy storage configuration of each transformer substation;
when transient simulation is carried out by using the current energy storage configuration capacity, if the configuration effect of the current configuration capacity of the energy storage configuration of each substation is superior to the corresponding configuration effect in the data set with the optimal capacity or the data set with the suboptimal capacity, replacing the data set with the optimal capacity or the data set with the suboptimal capacity by using the current configuration capacity, and updating the replaced data set with the optimal capacity and the data set with the suboptimal capacity; otherwise, the data set with the optimal capacity and the data set with the suboptimal capacity are not updated.
9. The method according to claim 6, wherein the comparing and analyzing the transient simulation result to obtain an optimal energy storage configuration range comprises:
and comparing and analyzing the improvement effect of the fault recovery characteristic of the alternating current and direct current hybrid operation system under different energy storage configuration capacities to obtain the optimal energy storage configuration range for improving the fault recovery characteristic of the alternating current and direct current hybrid operation system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010589194.9A CN111668885B (en) | 2020-06-24 | 2020-06-24 | Energy storage planning method for improving characteristics of alternating current and direct current hybrid power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010589194.9A CN111668885B (en) | 2020-06-24 | 2020-06-24 | Energy storage planning method for improving characteristics of alternating current and direct current hybrid power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111668885A true CN111668885A (en) | 2020-09-15 |
| CN111668885B CN111668885B (en) | 2022-03-01 |
Family
ID=72389786
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010589194.9A Active CN111668885B (en) | 2020-06-24 | 2020-06-24 | Energy storage planning method for improving characteristics of alternating current and direct current hybrid power system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111668885B (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350348A (en) * | 2021-01-07 | 2021-02-09 | 中国电力科学研究院有限公司 | Energy storage control method for increasing adjusting capacity of new energy station and new energy support machine |
| CN113469436A (en) * | 2021-06-30 | 2021-10-01 | 深圳供电局有限公司 | Urban power grid side energy storage planning method |
| CN113890119A (en) * | 2021-08-18 | 2022-01-04 | 广东电网有限责任公司 | Energy storage capacity configuration method, device and system for alternating current-direct current hybrid power grid |
| CN113991723A (en) * | 2021-10-22 | 2022-01-28 | 广东电网有限责任公司 | Energy storage power station configuration method for improving voltage stability of multi-feed-in direct current system |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601230A (en) * | 2019-09-19 | 2019-12-20 | 国电南瑞科技股份有限公司 | Quick response control method and system for energy storage system of alternating current-direct current power distribution network |
-
2020
- 2020-06-24 CN CN202010589194.9A patent/CN111668885B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110601230A (en) * | 2019-09-19 | 2019-12-20 | 国电南瑞科技股份有限公司 | Quick response control method and system for energy storage system of alternating current-direct current power distribution network |
Non-Patent Citations (2)
| Title |
|---|
| 李建林: "电化学储能电站群在特高压交直流混联受端电网应用技术研究综述", 《高电压技术》 * |
| 杨军峰等: "储能提升特高压交直流输电能力与提供跨区备用研究", 《储能科学与技术》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112350348A (en) * | 2021-01-07 | 2021-02-09 | 中国电力科学研究院有限公司 | Energy storage control method for increasing adjusting capacity of new energy station and new energy support machine |
| CN112350348B (en) * | 2021-01-07 | 2021-04-13 | 中国电力科学研究院有限公司 | Energy storage control method for increasing adjusting capacity of new energy station and new energy support machine |
| CN113469436A (en) * | 2021-06-30 | 2021-10-01 | 深圳供电局有限公司 | Urban power grid side energy storage planning method |
| CN113890119A (en) * | 2021-08-18 | 2022-01-04 | 广东电网有限责任公司 | Energy storage capacity configuration method, device and system for alternating current-direct current hybrid power grid |
| CN113890119B (en) * | 2021-08-18 | 2024-04-26 | 广东电网有限责任公司 | Energy storage capacity configuration method, device and system of alternating current-direct current hybrid power grid |
| CN113991723A (en) * | 2021-10-22 | 2022-01-28 | 广东电网有限责任公司 | Energy storage power station configuration method for improving voltage stability of multi-feed-in direct current system |
| CN113991723B (en) * | 2021-10-22 | 2024-04-26 | 广东电网有限责任公司 | Energy storage power station configuration method for improving voltage stability of multi-feed direct current system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN111668885B (en) | 2022-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111668885B (en) | Energy storage planning method for improving characteristics of alternating current and direct current hybrid power system | |
| Matayoshi et al. | Islanding operation scheme for DC microgrid utilizing pseudo Droop control of photovoltaic system | |
| CN108418255B (en) | Planning method and system suitable for extra-high voltage direct current outgoing power grid containing high-permeability new energy | |
| KR102551927B1 (en) | Comprehensive control method and system that guarantees voltage stability in power recovery phase of multi-phase DC system | |
| CA2333851C (en) | Power system stabilization system and method employing a rechargeable battery system | |
| CN109378830B (en) | Synchronous phase modulator site selection method based on long-distance power transmission | |
| Wu et al. | Design method for strengthening high-proportion renewable energy regional power grid using VSC-HVDC technology | |
| CN114336639B (en) | Intelligent traction substation and power flow control method thereof | |
| Yang et al. | A novel assessment index of LCC-HVDC system impact on short-term voltage stability of the receiving-end AC system | |
| Li et al. | Considering reactive power coordinated control of hybrid multi‐infeed HVDC system research into emergency DC power support | |
| CN113191675B (en) | Multi-direct-current-sending-end power grid planning scheme adaptability evaluation method and system | |
| Fotoohabadi et al. | Evaluating the technical benefits of AC–DC hybrid distribution systems consisting of solid-state transformers using a multiobjective index | |
| CN112600219A (en) | Dynamic reactive power standby optimization method for alternating current-direct current power grid | |
| CN110429614B (en) | Distributed energy storage device frequency control method simulating low-frequency load shedding control mode | |
| Callies et al. | Case studies: New options for power factor correction | |
| Chen et al. | Examination of major factors affecting voltage variation on distribution feeders | |
| Edris et al. | Transmission grid smart technologies | |
| CN113315140B (en) | Offshore wind power reactive compensation coordination control method | |
| CN110137985A (en) | A kind of phase-change switch control method and relevant apparatus | |
| Bawayan et al. | Mitigating low fault current in microgrids through renewables-battery hybrid units | |
| CN111626591B (en) | Risk assessment method for flexible platform area | |
| Wang et al. | Impact of HVDC transmission capacity on multi-send HVDC system voltage stability | |
| CN113852142A (en) | Multi-voltage-level static and dynamic reactive power configuration method for multi-direct-current feed-in power grid | |
| He et al. | Simulation of large-scale energy storage to improve high-voltage DC stability | |
| Kangsheng et al. | Technical Advantages Quantitative Evaluation of MVDC Applied in Flexible Interconnection of Distribution Network |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |