CN113378360A - Method and system for testing adaptability of new energy machine set connected into double-high power system - Google Patents
Method and system for testing adaptability of new energy machine set connected into double-high power system Download PDFInfo
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Abstract
The invention discloses an adaptability test method and system for a new energy machine set to access a double-high power system, which comprises the following steps: constructing a double-high power system test power grid example with system strength meeting test requirements; building a full electromagnetic transient simulation model of the double-high power system test power grid example; based on the full electromagnetic transient simulation model, the new energy machine set to be tested is connected into the double-high power system according to the short circuit ratio of the new energy multi-field station, the adaptability of the new energy machine set to be connected into the double-high power system under the condition that different new energy multi-field station short circuit ratios are connected is tested, so that the short circuit ratio of the new energy multi-field station allowing the new energy machine set to be tested to be connected is determined, and the research on the adaptability of the new energy machine set to be tested after being connected into the double-high power system is completed.
Description
Technical Field
The invention relates to the technical field of large power grid simulation, in particular to an adaptability test method and system for a new energy machine set to be connected into a double-high power system.
Background
In recent years, the ultra/extra-high voltage direct current transmission technology and the flexible direct current transmission technology are rapidly developed, the device capacity of new energy units such as photovoltaic units, fans and the like is rapidly increased, the proportion of novel power electronic equipment in a power grid is rapidly increased, and a power system in China forms a development trend of high-proportion renewable energy sources and high-proportion power electronic equipment, namely a double-high power system. Under the background, the new energy unit has essential difference compared with the traditional unit, so that the response characteristics of the new energy unit such as a photovoltaic unit, a fan and the like under different system intensities and the recovery capability under various alternating current/direct current disturbance faults directly influence the stable operation of the whole system.
Therefore, it is necessary to research the operation characteristics of the new energy source unit in the dual high power system, especially the power system with weak system strength, so as to satisfy the network access condition, and ensure the stable operation of the whole system after network access. Before a new energy single unit is connected to a network, a simple equivalent power grid without other new energy units is usually connected to the new energy single unit for testing, however, as the ratio of new energy power generation in the system is continuously increased, the single unit test result usually cannot comprehensively reflect the operation characteristic of the new energy single unit connected to the actual power grid.
Disclosure of Invention
The invention provides an adaptability test method and system for a new energy machine group to access a double-high power system, and aims to solve the problem of how to test the adaptability of the new energy machine group to access the double-high power system.
In order to solve the above problem, according to an aspect of the present invention, there is provided an adaptability test method for a new energy machine group to access a dual high power system, the method including:
constructing a double-high power system test power grid example with system strength meeting test requirements;
building a full electromagnetic transient simulation model of the double-high power system test power grid example;
based on the full electromagnetic transient simulation model, the new energy machine set to be tested is connected into the double-high power system according to the short circuit ratio of the new energy multi-field station, and the adaptability of the new energy machine set to be connected into the double-high power system under the condition that different new energy multi-field station short circuit ratios are connected is tested, so that the short circuit ratio of the new energy multi-field station to be tested, which allows the new energy machine set to be connected, is determined.
Preferably, the dual high power system test grid algorithm comprises: a high-proportion new energy station and a direct-current transmission system; wherein, the short circuit ratios of the new energy multi-field stations at the point of access of each new energy unit are all different.
Preferably, the constructing a full electromagnetic transient simulation model of the dual high power system test power grid example includes:
constructing a full electromagnetic transient simulation model of the double-high power system test power grid example based on a digital-analog hybrid real-time simulation platform of a full digital real-time simulator HYPERSI power system;
wherein, the full electromagnetic transient simulation model comprises: the system comprises a traditional generator set submodel, a new energy source generator set submodel, an extra-high voltage direct current transmission system submodel and a load submodel;
the traditional generator set submodel comprises a hydraulic turbine set and a steam turbine set, and both adopt a speed regulation controller and an excitation controller which have the same actual characteristics;
the new energy source unit submodel comprises a photovoltaic generator and a wind driven generator; the photovoltaic generator adopts a classical photovoltaic structured model, and the wind driven generator adopts a classical double-fed fan model and a classical direct-drive fan model;
the sub-model of the extra-high voltage direct current transmission system is established according to the actual engineering main loop structure and parameters and comprises a converter transformer, a converter valve, an alternating current filter, a direct current circuit, a grounding electrode circuit, a wave trap, a switch and a lightning arrester;
the load submodel comprises a static load and a dynamic load, the static load comprises a constant impedance load, a constant current load and a constant power load, and the dynamic load is arranged by adopting an induction motor.
Preferably, the determining, based on the full electromagnetic transient simulation model, a new energy machine to be tested according to a new energy multi-field station short-circuit ratio is connected to a dual high power system, and an adaptability of the new energy machine to be tested to the dual high power system under a condition that different new energy multi-field station short-circuit ratios are connected to determine a new energy multi-field station short-circuit ratio allowing the new energy machine to be tested to be connected to includes:
step 1, establishing a new energy unit model to be tested of the new energy unit to be tested, multiplying the new energy unit model to be tested by equivalence, and enabling installed capacity and active and reactive power output to be matched with access points of a double-high power system;
step 2, based on the full electromagnetic transient simulation model, accessing the new energy unit model to be tested to a point of access with the minimum new energy multi-field station short-circuit ratio in a new energy multi-field station short-circuit ratio sequence, accessing the new energy unit model to a power grid after passing through a step-up transformer and an equivalent collection line, and determining that the currently accessed new energy multi-field station short-circuit ratio meets the steady-state working condition establishment requirement if the power grid can stably run and the preset steady-state working condition establishment condition is met after the new energy unit to be tested is connected to the power grid;
and 3, when the short-circuit ratio of the currently accessed new energy multi-field station meets the requirement for establishing a steady-state working condition, testing preset typical fault ride-through capability at the access point of the short-circuit ratio of the currently accessed new energy multi-field station, if the new energy unit to be tested can recover normal operation after the preset typical fault, determining that the system can meet the requirement of fault ride-through characteristic by the access point of the short-circuit ratio of the currently accessed new energy multi-field station of the new energy unit to be tested, and determining that the short-circuit ratio of the currently accessed new energy multi-field station is the short-circuit ratio of the new energy multi-field station which allows the new energy unit to be tested to access.
Preferably, wherein the method further comprises:
and when the short-circuit ratio of the currently accessed new energy multi-field station is determined not to meet the requirement for establishing a steady-state working condition, or the fact that the system cannot meet the requirement for fault ride-through characteristics at the access point of the currently accessed new energy multi-field station short-circuit ratio of the new energy unit to be tested is determined, the new energy unit to be tested is accessed to the access point of the next higher new energy multi-field station short-circuit ratio selected according to the new energy multi-field station short-circuit ratio sequence, and the step 2 is returned to for testing again.
Preferably, the preset steady-state condition establishing condition comprises: before and after the new energy source unit to be tested is accessed, the output of the new energy source unit in the network normally operates according to a set value, the variation range of the voltage of the key bus node is within a preset first variation range, and the variation range of the transmission power of the ultra-high voltage direct current transmission system is within a preset second variation range.
According to another aspect of the present invention, there is provided an adaptability test system in which a new energy bank is connected to a dual high power system, the system comprising:
the power grid testing example constructing unit is used for constructing a power grid testing example of the double-high power system, the system strength of which meets the testing requirement;
the model building unit is used for building a full electromagnetic transient simulation model of the double-high power system test power grid example;
and the testing unit is used for connecting the new energy machine group to be tested into the double-high power system according to the short circuit ratio of the new energy multi-field station based on the full electromagnetic transient simulation model, and testing the adaptability of the new energy machine group to be tested into the double-high power system under the condition of connecting different short circuit ratios of the new energy multi-field station so as to determine the short circuit ratio of the new energy multi-field station allowing the new energy machine group to be tested to be connected.
Preferably, in the test grid example construction unit, the dual high power system test grid example includes: a high-proportion new energy station and a direct-current transmission system; wherein, the short circuit ratios of the new energy multi-field stations at the point of access of each new energy unit are all different.
Preferably, the model building unit builds a full electromagnetic transient simulation model of the dual high power system test grid example, and the model building unit includes:
constructing a full electromagnetic transient simulation model of the double-high power system test power grid example based on a digital-analog hybrid real-time simulation platform of a full digital real-time simulator HYPERSI power system;
wherein, the full electromagnetic transient simulation model comprises: the system comprises a traditional generator set submodel, a new energy source generator set submodel, an extra-high voltage direct current transmission system submodel and a load submodel;
the traditional generator set submodel comprises a hydraulic turbine set and a steam turbine set, and both adopt a speed regulation controller and an excitation controller which have the same actual characteristics;
the new energy source unit submodel comprises a photovoltaic generator and a wind driven generator; the photovoltaic generator adopts a classical photovoltaic structured model, and the wind driven generator adopts a classical double-fed fan model and a classical direct-drive fan model;
the sub-model of the extra-high voltage direct current transmission system is established according to the actual engineering main loop structure and parameters and comprises a converter transformer, a converter valve, an alternating current filter, a direct current circuit, a grounding electrode circuit, a wave trap, a switch and a lightning arrester;
the load submodel comprises a static load and a dynamic load, the static load comprises a constant impedance load, a constant current load and a constant power load, and the dynamic load is arranged by adopting an induction motor.
Preferably, the testing unit, based on the full electromagnetic transient simulation model, accesses the new energy source unit to be tested into the dual high power system according to the new energy multi-field station short circuit ratio, and tests the adaptability of the new energy source unit to be tested into the dual high power system under the condition that different new energy multi-field station short circuit ratios are accessed, so as to determine the new energy multi-field station short circuit ratio allowing the new energy source unit to be tested to be accessed, including:
the matching module is used for establishing a new energy unit model to be tested of the new energy unit to be tested, multiplying the new energy unit model to be tested by equivalence, and enabling installed capacity and active and reactive power output to be matched with access points of the double-high power system;
the steady-state working condition establishing test module is used for accessing the new energy unit model to be tested to an access point with the minimum new energy multi-field station short-circuit ratio in a new energy multi-field station short-circuit ratio sequence based on the full electromagnetic transient simulation model, accessing the new energy unit model to be tested to a power grid after passing through a step-up transformer and an equivalent collection line, and determining that the currently accessed new energy multi-field station short-circuit ratio meets the steady-state working condition establishing requirement if the power grid can stably run and the preset steady-state working condition establishing condition is met after the new energy unit to be tested is connected to the power grid;
the fault ride-through characteristic testing module is used for testing the preset typical fault ride-through capability at the access point of the currently accessed new energy multi-field station short-circuit ratio when the fact that the currently accessed new energy multi-field station short-circuit ratio meets the requirement for establishing the steady-state working condition is determined, if the new energy unit to be tested can recover to normally operate after the preset typical fault, the fact that the system can meet the fault ride-through characteristic requirement at the access point of the currently accessed new energy multi-field station short-circuit ratio of the new energy unit to be tested is determined, and the fact that the currently accessed new energy multi-field station short-circuit ratio is the new energy multi-field station short-circuit ratio allowing the new energy unit to be tested to be accessed is determined.
Preferably, wherein the system further comprises:
and the updating module is used for accessing the new energy unit to be tested to the access point with the next higher new energy multi-field station short-circuit ratio selected according to the new energy multi-field station short-circuit ratio sequence and returning to the steady-state working condition establishment testing module for testing again when the short-circuit ratio of the currently accessed new energy multi-field station is determined not to meet the steady-state working condition establishment requirement or the access point of the new energy unit to be tested at the currently accessed new energy multi-field station short-circuit ratio is determined not to enable the system to meet the fault crossing characteristic requirement.
Preferably, in the steady-state condition establishing test module, the preset steady-state condition establishing condition includes: before and after the new energy source unit to be tested is accessed, the output of the new energy source unit in the network normally operates according to a set value, the variation range of the voltage of the key bus node is within a preset first variation range, and the variation range of the transmission power of the ultra-high voltage direct current transmission system is within a preset second variation range.
The invention provides a method and a system for testing adaptability of a new energy machine group to a double-high power system, which construct a full electromagnetic transient simulation model of a typical double-high power system testing power grid example, wherein the typical double-high power system testing power grid example comprises a high-proportion new energy field station and a direct-current transmission system, and the whole power grid system strength is weaker, and according to the full electromagnetic transient simulation model, a new energy machine group to be tested is connected to different access points of a new energy multi-field station short-circuit ratio, and transient steady-state characteristic testing is carried out to determine the new energy multi-field station short-circuit ratio allowing the new energy machine group to be tested to be connected, so that the research on the adaptability of the new energy machine group to be tested to the double-high power system is completed.
Drawings
A more complete understanding of exemplary embodiments of the present invention may be had by reference to the following drawings in which:
fig. 1 is a flow chart of an adaptability test method 100 for a new energy machine group to access a dual high power system according to an embodiment of the present invention;
fig. 2 is a flowchart of an adaptability test after a new energy machine group to be networked accesses a dual-high system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of an adaptive test system 300 for a new energy machine set connected to a dual high-power system according to an embodiment of the present invention.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the embodiments described herein, which are provided for complete and complete disclosure of the present invention and to fully convey the scope of the present invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, the same units/elements are denoted by the same reference numerals.
Unless otherwise defined, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Further, it will be understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Fig. 1 is a flowchart of an adaptability testing method 100 for a new energy machine group to access a dual high-power system according to an embodiment of the present invention. As shown in fig. 1, according to the method for testing adaptability of a new energy source unit to access a dual-high power system provided by the embodiment of the present invention, a full electromagnetic transient simulation model of a typical dual-high power system test power grid example is constructed, the typical dual-high power system test power grid example includes a high-ratio new energy field station and a dc transmission system, and the whole power grid system has a weak strength, according to the full electromagnetic transient simulation model, a new energy source unit to be tested is accessed to access an access point with a short-circuit ratio of different new energy field stations, and a transient steady-state characteristic test is performed to determine a short-circuit ratio of the new energy field station to which the new energy source unit to be tested is allowed to access, so as to complete a study on adaptability of the new energy source unit to be tested after being accessed to the dual-high power system. The adaptability test method 100 for the new energy machine set to be connected into the double-high power system provided by the embodiment of the invention starts from step 101, and constructs a double-high power system test power grid example with the system strength meeting the test requirement in step 101.
Preferably, the dual high power system test grid algorithm comprises: a high-proportion new energy station and a direct-current transmission system; wherein, the short circuit ratios of the new energy multi-field stations at the point of access of each new energy unit are all different.
In the invention, in order to research the actual response characteristics of the new energy machine set after being connected into the double-high power system, a typical test power grid sample with weak system strength as a whole needs to be constructed. The test grid algorithm needs to satisfy the following two conditions. Firstly, testing a new energy power generation and direct current transmission system with a high proportion in a power grid example; and secondly, the system strength corresponding to the network access point of each new energy source unit is different, so that the adaptability research and test of the new energy source unit under different system strengths can be met.
In the invention, based on the conditions, a test power grid example with the scale of 1000 three-phase nodes is constructed, and the test power grid comprises a complete grid frame with the voltage level of 110kV or more, 35 traditional generators, 97 new energy plant station models, 41 detailed induction motor electromagnetic transient models and an extra-high voltage direct current transmission project. Under the condition of access of multiple new energy stations, the short circuit ratio of the new energy stations is a quantitative evaluation index for considering the mutual influence among the multiple new energy stations. The new energy multi-station short circuit ratio reflects the capability of a power grid for reactive voltage support of a power grid side access point or a station grid-connected point of the new energy power generation equipment. Under the condition of a large power grid, according to the definition and the calculation formula of the new energy multi-station short-circuit ratio (MRSCR), the new energy multi-station short-circuit ratio corresponding to each new energy station power grid side access point (usually 690V/400V) under the test example can be obtained, as shown in table 1. As can be seen from table 1, the short-circuit ratio ranges of the new energy multi-station corresponding to all new energy grid-side access points in the test grid are 1.578-2.878.
Table 1 test of short-circuit ratio of each new energy source in power grid
In step 102, a full electromagnetic transient simulation model of the double-high power system test power grid example is built.
Preferably, the constructing a full electromagnetic transient simulation model of the dual high power system test power grid example includes:
constructing a full electromagnetic transient simulation model of the double-high power system test power grid example based on a digital-analog hybrid real-time simulation platform of a full digital real-time simulator HYPERSI power system;
wherein, the full electromagnetic transient simulation model comprises: the system comprises a traditional generator set submodel, a new energy source generator set submodel, an extra-high voltage direct current transmission system submodel and a load submodel;
the traditional generator set submodel comprises a hydraulic turbine set and a steam turbine set, and both adopt a speed regulation controller and an excitation controller which have the same actual characteristics;
the new energy source unit submodel comprises a photovoltaic generator and a wind driven generator; the photovoltaic generator adopts a classical photovoltaic structured model, and the wind driven generator adopts a classical double-fed fan model and a classical direct-drive fan model;
the sub-model of the extra-high voltage direct current transmission system is established according to the actual engineering main loop structure and parameters and comprises a converter transformer, a converter valve, an alternating current filter, a direct current circuit, a grounding electrode circuit, a wave trap, a switch and a lightning arrester;
the load submodel comprises a static load and a dynamic load, the static load comprises a constant impedance load, a constant current load and a constant power load, and the dynamic load is arranged by adopting an induction motor.
In the invention, when full electromagnetic transient simulation modeling of a test power grid example is carried out, a full electromagnetic transient simulation model of the test power grid example is built on a HYPERSI power system digital-analog hybrid real-time simulation platform, and 50us simulation step length is adopted for calculation. In the model, the primary parts of the alternating current system, the new energy power generation system and the direct current system all adopt detailed digital electromagnetic transient models so as to accurately reflect the regulation characteristics of the actual power grid. The control protection system of the direct current engineering adopts a direct current engineering control protection device consistent with the field characteristics for simulation.
In the invention, the full electromagnetic transient simulation model for testing the power grid comprises the following parts:
(1) traditional generator set
The traditional generator set comprises a water turbine set and a steam turbine set, and both adopt a speed regulation controller and an excitation controller which have the same actual characteristics.
(2) New energy unit
The new energy machine set comprises two categories of photovoltaic generators and wind driven generators. A photovoltaic generator model adopts a classical photovoltaic structural model, and a wind driven generator model adopts a classical double-fed fan model and a classical direct-drive fan model. The new energy primary main loop model mainly comprises a new energy unit model, a transformer and an equivalent collector line model, and the control protection system adopts a typical controller model and has the functions of high-low penetration and the like consistent with actual regulation characteristics.
(3) Extra-high voltage direct current transmission system
The method mainly comprises the steps of establishing a primary model of the ultra-high voltage direct current transmission system according to the actual engineering main loop structure and parameters, and mainly comprising a converter transformer model, a converter valve model, an alternating current filter model, a direct current line model, an earth electrode line model, a wave trap model, a switch model and a lightning arrester model. The direct current control protection physical simulation system adopts a direct current control protection device with the same actual characteristics.
(4) Load model
The load model comprises a static load model and a dynamic load model, the static load model comprises a constant impedance load, a constant current load and a constant power load, and the dynamic load model adopts an induction motor model.
In step 103, based on the full electromagnetic transient simulation model, the new energy machine set to be tested is connected to the dual-high power system according to the new energy multi-field station short circuit ratio, and the adaptability of the new energy machine set to be connected to the dual-high power system under the condition that different new energy multi-field station short circuit ratios are connected is tested, so that the new energy multi-field station short circuit ratio allowing the new energy machine set to be tested to be connected is determined.
Preferably, the determining, based on the full electromagnetic transient simulation model, a new energy machine to be tested according to a new energy multi-field station short-circuit ratio is connected to a dual high power system, and an adaptability of the new energy machine to be tested to the dual high power system under a condition that different new energy multi-field station short-circuit ratios are connected to determine a new energy multi-field station short-circuit ratio allowing the new energy machine to be tested to be connected to includes:
step 1, establishing a new energy unit model to be tested of the new energy unit to be tested, multiplying the new energy unit model to be tested by equivalence, and enabling installed capacity and active and reactive power output to be matched with access points of a double-high power system;
step 2, based on the full electromagnetic transient simulation model, accessing the new energy unit model to be tested to a point of access with the minimum new energy multi-field station short-circuit ratio in a new energy multi-field station short-circuit ratio sequence, accessing the new energy unit model to a power grid after passing through a step-up transformer and an equivalent collection line, and determining that the currently accessed new energy multi-field station short-circuit ratio meets the steady-state working condition establishment requirement if the power grid can stably run and the preset steady-state working condition establishment condition is met after the new energy unit to be tested is connected to the power grid;
and 3, when the short-circuit ratio of the currently accessed new energy multi-field station meets the requirement for establishing a steady-state working condition, testing preset typical fault ride-through capability at the access point of the short-circuit ratio of the currently accessed new energy multi-field station, if the new energy unit to be tested can recover normal operation after the preset typical fault, determining that the system can meet the requirement of fault ride-through characteristic by the access point of the short-circuit ratio of the currently accessed new energy multi-field station of the new energy unit to be tested, and determining that the short-circuit ratio of the currently accessed new energy multi-field station is the short-circuit ratio of the new energy multi-field station which allows the new energy unit to be tested to access.
Preferably, wherein the method further comprises:
and when the short-circuit ratio of the currently accessed new energy multi-field station is determined not to meet the requirement for establishing a steady-state working condition, or the fact that the system cannot meet the requirement for fault ride-through characteristics at the access point of the currently accessed new energy multi-field station short-circuit ratio of the new energy unit to be tested is determined, the new energy unit to be tested is accessed to the access point of the next higher new energy multi-field station short-circuit ratio selected according to the new energy multi-field station short-circuit ratio sequence, and the step 2 is returned to for testing again.
Preferably, the preset steady-state condition establishing condition comprises: before and after the new energy source unit to be tested is accessed, the output of the new energy source unit in the network normally operates according to a set value, the variation range of the voltage of the key bus node is within a preset first variation range, and the variation range of the transmission power of the ultra-high voltage direct current transmission system is within a preset second variation range.
With reference to fig. 2, in the invention, during testing, firstly, a new energy model to be tested is built, then the new energy model to be tested is accessed into a dual high power system according to the short circuit ratio of the multiple field stations, whether establishment of a steady state working condition is met is judged, if yes, whether a fault ride-through test is passed is judged, a fault ride-through characteristic requirement is met, if yes, the short circuit ratio of the currently accessed new energy multiple field stations is determined to be the short circuit ratio of the new energy multiple field stations allowing access of the new energy group to be tested, and the adaptability test of the new energy group to be tested after the new energy group is accessed into the dual high power system is completed. And if the fault crossing test cannot be established under the steady-state working condition or fails and the fault crossing characteristic requirement cannot be met, accessing the access point with the short-circuit ratio of the multi-field station and retesting.
In the invention, during testing, the new energy unit model to be tested is accessed to different positions of the double-high power system (the different positions correspond to different new energy multi-station short-circuit ratios), and is accessed to the station equivalent collection line, and the network access performance of the new energy unit to be networked at the new energy unit end at different positions (the different new energy multi-station short-circuit ratios) is tested. Specifically, the test procedure includes:
and S1, building a new energy model to be tested.
The new energy machine set tested by the invention comprises three types of photovoltaic models, double-fed fans and direct-drive fan models of different manufacturers.
The method comprises the steps of firstly establishing a new energy generating set model to be tested of the new energy generating set to be tested, wherein a primary loop is built according to the actual generating set structure and parameters, and a control protection system adopts a digital packaging model provided by a manufacturer and can also be accessed to a controller device for semi-physical simulation. The new energy models in the power grid in the embodiment all adopt classical photovoltaic structural models and classical fan models, and the new energy models to be tested are built according to actual parameters of various manufacturers. Taking a sunlight power supply photovoltaic model as an example, the model of an inverter is SG1250UD, the capacitance of a direct current bus is 4225uF (each unit), the capacitance of an alternating current side is 200uF (each unit, delta connection method), the inductance is 50uH, and the main circuit parameters of the inverter are shown in table 2.
TABLE 2 sunlight photovoltaic product main circuit technical parameters
And secondly, multiplying the new energy single-machine model to obtain equivalent value, so that the installed capacity and the active and reactive power output of the new energy generator set to be tested are matched with the access point of the system. When station equivalence is carried out, power loss of a station collector line needs to be considered, and station collector line equivalent impedance is simulated.
And S2, establishing a test under the steady state working condition.
And (3) connecting the new energy model to be tested to a network access point with the minimum short-circuit ratio of the multiple stations in the test power grid according to the short-circuit ratio of the multiple stations at the new energy machine end, connecting the new energy model to the power grid after passing through a step-up transformer and an equivalent collection line, and testing the establishment of the steady-state working condition. And adjusting the capacity of the new energy unit to be measured to be the same as the capacity of the original unit by a multiplication method. Determining that the stable operation of the test power grid needs to meet a preset steady-state working condition establishment condition, wherein the condition comprises the following conditions:
1. before and after the new energy source unit to be tested is accessed, the output of the new energy source unit in the network normally operates according to a set value;
2. before and after the new energy source unit to be tested is accessed, the voltage of the key bus node is basically unchanged, and the variation amplitude of the voltage of the key bus node is within a preset first variation amplitude range;
3. before and after the new energy source unit to be tested is accessed, the transmission power of the direct current model is basically unchanged, and the variation range of the transmission power of the extra-high voltage direct current transmission system is within a preset second variation range. The first variation range and the second variation range can be set according to test requirements.
And if the new energy model to be tested can stably operate the system after being connected into the test power grid and meet the 3 conditions, continuing to test the fault ride-through characteristic in the next step. If the steady-state working condition building test is failed, the access to a point of presence with a larger short circuit ratio of the multi-field station is needed to carry out the steady-state working condition building test again.
And S3, testing fault ride through characteristics.
After the new energy model to be tested passes the steady-state working condition establishment test, the network access point is used for testing the ride-through capability of typical faults (including 330kV, 750kV and 35kV alternating current line single permanent magnet, three permanent magnet and interphase faults, etc.), if the system of the new energy unit to be tested can recover normal operation after the typical faults, the network access point of the short-circuit ratio of the new energy unit to be tested at the currently accessed new energy multi-field station is determined to enable the system to meet the fault ride-through characteristic requirement, and the new energy model to be tested is indicated to be adaptive under the system strength corresponding to the network access point, so that the short-circuit ratio of the currently accessed new energy multi-field station is determined to be the short-circuit ratio of the new energy multi-field station allowing the new energy unit to be tested to be accessed.
In addition, if the new energy machine group to be tested fails the fault ride-through test at the current point of presence, the new energy machine group to be tested needs to be accessed to the machine group of presence with a higher short-circuit ratio of the multi-field station, and the next round of test is carried out again by returning to the step S2 until finally passing the system adaptability test, and the short-circuit ratio of the currently accessed new energy multi-field station is determined to be the short-circuit ratio of the new energy multi-field station which allows the new energy machine group to be tested to be accessed.
The Qinghai power grid Qingyu direct current sending-out system is a typical double-high power system containing large-scale new energy, wherein 43 fan stations and 152 photovoltaic stations are arranged in the power grid Qingyu direct current sending-out system. By means of the test power grid and the test method, the new energy station models of various manufacturers to be connected into the Qinghai power grid can be respectively connected into the test power grid for adaptability test. Through testing, the large power grid adaptability of new energy controllers of part manufacturer models is poor. It can thus be proposed to improve its adaptability to large power grids by optimizing the controller parameters.
Fig. 3 is a schematic structural diagram of an adaptive test system 300 for a new energy machine set connected to a dual high-power system according to an embodiment of the present invention. As shown in fig. 3, an adaptability testing system 300 for accessing an energy unit to a dual high power system according to an embodiment of the present invention includes: the system comprises a test power grid example building unit 301, a model building unit 302 and a test unit 303.
Preferably, the test grid example constructing unit 301 is configured to construct a double high power system test grid example with system strength meeting the test requirement.
Preferably, in the test grid example construction unit 301, the dual high power system test grid example includes: a high-proportion new energy station and a direct-current transmission system; wherein, the short circuit ratios of the new energy multi-field stations at the point of access of each new energy unit are all different.
Preferably, the model building unit 302 is configured to build a full electromagnetic transient simulation model of the dual high power system test grid embodiment.
Preferably, the model building unit 302 builds a full electromagnetic transient simulation model of the dual high power system test grid example, including:
constructing a full electromagnetic transient simulation model of the double-high power system test power grid example based on a digital-analog hybrid real-time simulation platform of a full digital real-time simulator HYPERSI power system;
wherein, the full electromagnetic transient simulation model comprises: the system comprises a traditional generator set submodel, a new energy source generator set submodel, an extra-high voltage direct current transmission system submodel and a load submodel;
the traditional generator set submodel comprises a hydraulic turbine set and a steam turbine set, and both adopt a speed regulation controller and an excitation controller which have the same actual characteristics;
the new energy source unit submodel comprises a photovoltaic generator and a wind driven generator; the photovoltaic generator adopts a classical photovoltaic structured model, and the wind driven generator adopts a classical double-fed fan model and a classical direct-drive fan model;
the sub-model of the extra-high voltage direct current transmission system is established according to the actual engineering main loop structure and parameters and comprises a converter transformer, a converter valve, an alternating current filter, a direct current circuit, a grounding electrode circuit, a wave trap, a switch and a lightning arrester;
the load submodel comprises a static load and a dynamic load, the static load comprises a constant impedance load, a constant current load and a constant power load, and the dynamic load is arranged by adopting an induction motor.
Preferably, the testing unit 303 is configured to, based on the full electromagnetic transient simulation model, access the new energy source unit to be tested to the dual-high power system according to the short-circuit ratio of the new energy multi-field station, and test the adaptability of the new energy source unit to the dual-high power system under the condition that the new energy source unit is accessed to different short-circuit ratios of the new energy multi-field station, so as to determine the short-circuit ratio of the new energy multi-field station to which the new energy source unit to be tested is allowed to be accessed.
Preferably, the testing unit 303, based on the full electromagnetic transient simulation model, accesses the new energy source unit to be tested into the dual high power system according to the short circuit ratio of the new energy multi-field station, and tests the adaptability of the new energy source unit to be tested into the dual high power system under the condition that the new energy source unit is accessed with the short circuit ratio of the new energy multi-field station, so as to determine the short circuit ratio of the new energy source unit to be tested, including:
the matching module is used for establishing a new energy unit model to be tested of the new energy unit to be tested, multiplying the new energy unit model to be tested by equivalence, and enabling installed capacity and active and reactive power output to be matched with access points of the double-high power system;
the steady-state working condition establishing test module is used for accessing the new energy unit model to be tested to an access point with the minimum new energy multi-field station short-circuit ratio in a new energy multi-field station short-circuit ratio sequence based on the full electromagnetic transient simulation model, accessing the new energy unit model to be tested to a power grid after passing through a step-up transformer and an equivalent collection line, and determining that the currently accessed new energy multi-field station short-circuit ratio meets the steady-state working condition establishing requirement if the power grid can stably run and the preset steady-state working condition establishing condition is met after the new energy unit to be tested is connected to the power grid;
the fault ride-through characteristic testing module is used for testing the preset typical fault ride-through capability at the access point of the currently accessed new energy multi-field station short-circuit ratio when the fact that the currently accessed new energy multi-field station short-circuit ratio meets the requirement for establishing the steady-state working condition is determined, if the new energy unit to be tested can recover to normally operate after the preset typical fault, the fact that the system can meet the fault ride-through characteristic requirement at the access point of the currently accessed new energy multi-field station short-circuit ratio of the new energy unit to be tested is determined, and the fact that the currently accessed new energy multi-field station short-circuit ratio is the new energy multi-field station short-circuit ratio allowing the new energy unit to be tested to be accessed is determined.
Preferably, wherein the system further comprises:
and the updating module is used for accessing the new energy unit to be tested to the access point with the next higher new energy multi-field station short-circuit ratio selected according to the new energy multi-field station short-circuit ratio sequence and returning to the steady-state working condition establishment testing module for testing again when the short-circuit ratio of the currently accessed new energy multi-field station is determined not to meet the steady-state working condition establishment requirement or the access point of the new energy unit to be tested at the currently accessed new energy multi-field station short-circuit ratio is determined not to enable the system to meet the fault crossing characteristic requirement.
Preferably, in the steady-state condition establishing test module, the preset steady-state condition establishing condition includes: before and after the new energy source unit to be tested is accessed, the output of the new energy source unit in the network normally operates according to a set value, the variation range of the voltage of the key bus node is within a preset first variation range, and the variation range of the transmission power of the ultra-high voltage direct current transmission system is within a preset second variation range.
The adaptability test system 300 for accessing a new energy machine set to a dual high power system according to an embodiment of the present invention corresponds to the adaptability test method 100 for accessing a new energy machine set to a dual high power system according to another embodiment of the present invention, and is not described herein again.
The invention has been described with reference to a few embodiments. However, other embodiments of the invention than the one disclosed above are equally possible within the scope of the invention, as would be apparent to a person skilled in the art from the appended patent claims.
Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a/an/the [ device, component, etc ]" are to be interpreted openly as referring to at least one instance of said device, component, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not have to be performed in the exact order disclosed, unless explicitly stated.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.
Claims (12)
1. A method for testing adaptability of a new energy machine set connected into a double-high power system is characterized by comprising the following steps:
constructing a double-high power system test power grid example with system strength meeting test requirements;
building a full electromagnetic transient simulation model of the double-high power system test power grid example;
based on the full electromagnetic transient simulation model, the new energy machine set to be tested is connected into the double-high power system according to the short circuit ratio of the new energy multi-field station, and the adaptability of the new energy machine set to be connected into the double-high power system under the condition that different new energy multi-field station short circuit ratios are connected is tested, so that the short circuit ratio of the new energy multi-field station to be tested, which allows the new energy machine set to be connected, is determined.
2. The method of claim 1, wherein the dual high power system test grid algorithm comprises: a high-proportion new energy station and a direct-current transmission system; wherein, the short circuit ratios of the new energy multi-field stations at the point of access of each new energy unit are all different.
3. The method according to claim 1, wherein the building of the full electromagnetic transient simulation model of the dual high power system test grid algorithm comprises:
constructing a full electromagnetic transient simulation model of the double-high power system test power grid example based on a digital-analog hybrid real-time simulation platform of a full digital real-time simulator HYPERSI power system;
wherein, the full electromagnetic transient simulation model comprises: the system comprises a traditional generator set submodel, a new energy source generator set submodel, an extra-high voltage direct current transmission system submodel and a load submodel;
the traditional generator set submodel comprises a hydraulic turbine set and a steam turbine set, and both adopt a speed regulation controller and an excitation controller which have the same actual characteristics;
the new energy source unit submodel comprises a photovoltaic generator and a wind driven generator; the photovoltaic generator adopts a classical photovoltaic structured model, and the wind driven generator adopts a classical double-fed fan model and a classical direct-drive fan model;
the sub-model of the extra-high voltage direct current transmission system is established according to the actual engineering main loop structure and parameters and comprises a converter transformer, a converter valve, an alternating current filter, a direct current circuit, a grounding electrode circuit, a wave trap, a switch and a lightning arrester;
the load submodel comprises a static load and a dynamic load, the static load comprises a constant impedance load, a constant current load and a constant power load, and the dynamic load is arranged by adopting an induction motor.
4. The method according to claim 1, wherein the testing adaptability of the new energy machine group to be connected to the dual high power system under different new energy multi-field station short circuit ratio access conditions based on the full electromagnetic transient simulation model according to the new energy multi-field station short circuit ratio to determine the new energy multi-field station short circuit ratio allowing the new energy machine group to be connected comprises:
step 1, establishing a new energy unit model to be tested of the new energy unit to be tested, multiplying the new energy unit model to be tested by equivalence, and enabling installed capacity and active and reactive power output to be matched with access points of a double-high power system;
step 2, based on the full electromagnetic transient simulation model, accessing the new energy unit model to be tested to a point of access with the minimum new energy multi-field station short-circuit ratio in a new energy multi-field station short-circuit ratio sequence, accessing the new energy unit model to a power grid after passing through a step-up transformer and an equivalent collection line, and determining that the currently accessed new energy multi-field station short-circuit ratio meets the steady-state working condition establishment requirement if the power grid can stably run and the preset steady-state working condition establishment condition is met after the new energy unit to be tested is connected to the power grid;
and 3, when the short-circuit ratio of the currently accessed new energy multi-field station meets the requirement for establishing a steady-state working condition, testing preset typical fault ride-through capability at the access point of the short-circuit ratio of the currently accessed new energy multi-field station, if the new energy unit to be tested can recover normal operation after the preset typical fault, determining that the system can meet the requirement of fault ride-through characteristic by the access point of the short-circuit ratio of the currently accessed new energy multi-field station of the new energy unit to be tested, and determining that the short-circuit ratio of the currently accessed new energy multi-field station is the short-circuit ratio of the new energy multi-field station which allows the new energy unit to be tested to access.
5. The method of claim 4, further comprising:
and when the short-circuit ratio of the currently accessed new energy multi-field station is determined not to meet the requirement for establishing a steady-state working condition, or the fact that the system cannot meet the requirement for fault ride-through characteristics at the access point of the currently accessed new energy multi-field station short-circuit ratio of the new energy unit to be tested is determined, the new energy unit to be tested is accessed to the access point of the next higher new energy multi-field station short-circuit ratio selected according to the new energy multi-field station short-circuit ratio sequence, and the step 2 is returned to for testing again.
6. The method of claim 4, wherein the predetermined steady-state operating condition establishing condition comprises: before and after the new energy source unit to be tested is accessed, the output of the new energy source unit in the network normally operates according to a set value, the variation range of the voltage of the key bus node is within a preset first variation range, and the variation range of the transmission power of the ultra-high voltage direct current transmission system is within a preset second variation range.
7. An adaptability test system for a new energy machine set to be connected into a double high power system, the system comprising:
the power grid testing example constructing unit is used for constructing a power grid testing example of the double-high power system, the system strength of which meets the testing requirement;
the model building unit is used for building a full electromagnetic transient simulation model of the double-high power system test power grid example;
and the testing unit is used for connecting the new energy machine group to be tested into the double-high power system according to the short circuit ratio of the new energy multi-field station based on the full electromagnetic transient simulation model, and testing the adaptability of the new energy machine group to be tested into the double-high power system under the condition of connecting different short circuit ratios of the new energy multi-field station so as to determine the short circuit ratio of the new energy multi-field station allowing the new energy machine group to be tested to be connected.
8. The system of claim 7, wherein in the test grid algorithm building unit, the dual high power system test grid algorithm comprises: a high-proportion new energy station and a direct-current transmission system; wherein, the short circuit ratios of the new energy multi-field stations at the point of access of each new energy unit are all different.
9. The system according to claim 7, wherein the model building unit builds a full electromagnetic transient simulation model of the dual high power system test grid operator, and comprises:
constructing a full electromagnetic transient simulation model of the double-high power system test power grid example based on a digital-analog hybrid real-time simulation platform of a full digital real-time simulator HYPERSI power system;
wherein, the full electromagnetic transient simulation model comprises: the system comprises a traditional generator set submodel, a new energy source generator set submodel, an extra-high voltage direct current transmission system submodel and a load submodel;
the traditional generator set submodel comprises a hydraulic turbine set and a steam turbine set, and both adopt a speed regulation controller and an excitation controller which have the same actual characteristics;
the new energy source unit submodel comprises a photovoltaic generator and a wind driven generator; the photovoltaic generator adopts a classical photovoltaic structured model, and the wind driven generator adopts a classical double-fed fan model and a classical direct-drive fan model;
the sub-model of the extra-high voltage direct current transmission system is established according to the actual engineering main loop structure and parameters and comprises a converter transformer, a converter valve, an alternating current filter, a direct current circuit, a grounding electrode circuit, a wave trap, a switch and a lightning arrester;
the load submodel comprises a static load and a dynamic load, the static load comprises a constant impedance load, a constant current load and a constant power load, and the dynamic load is arranged by adopting an induction motor.
10. The system according to claim 7, wherein the testing unit, based on the full electromagnetic transient simulation model, accesses a new energy group to be tested into the dual high power system according to a new energy multi-station short circuit ratio, and tests adaptability of the new energy group to be accessed into the dual high power system under different new energy multi-station short circuit ratio access conditions to determine a new energy multi-station short circuit ratio allowing the new energy group to be tested to access, includes:
the matching module is used for establishing a new energy unit model to be tested of the new energy unit to be tested, multiplying the new energy unit model to be tested by equivalence, and enabling installed capacity and active and reactive power output to be matched with access points of the double-high power system;
the steady-state working condition establishing test module is used for accessing the new energy unit model to be tested to an access point with the minimum new energy multi-field station short-circuit ratio in a new energy multi-field station short-circuit ratio sequence based on the full electromagnetic transient simulation model, accessing the new energy unit model to be tested to a power grid after passing through a step-up transformer and an equivalent collection line, and determining that the currently accessed new energy multi-field station short-circuit ratio meets the steady-state working condition establishing requirement if the power grid can stably run and the preset steady-state working condition establishing condition is met after the new energy unit to be tested is connected to the power grid;
the fault ride-through characteristic testing module is used for testing the preset typical fault ride-through capability at the access point of the currently accessed new energy multi-field station short-circuit ratio when the fact that the currently accessed new energy multi-field station short-circuit ratio meets the requirement for establishing the steady-state working condition is determined, if the new energy unit to be tested can recover to normally operate after the preset typical fault, the fact that the system can meet the fault ride-through characteristic requirement at the access point of the currently accessed new energy multi-field station short-circuit ratio of the new energy unit to be tested is determined, and the fact that the currently accessed new energy multi-field station short-circuit ratio is the new energy multi-field station short-circuit ratio allowing the new energy unit to be tested to be accessed is determined.
11. The system of claim 10, further comprising:
and the updating module is used for accessing the new energy unit to be tested to the access point with the next higher new energy multi-field station short-circuit ratio selected according to the new energy multi-field station short-circuit ratio sequence and returning to the steady-state working condition establishment testing module for testing again when the short-circuit ratio of the currently accessed new energy multi-field station is determined not to meet the steady-state working condition establishment requirement or the access point of the new energy unit to be tested at the currently accessed new energy multi-field station short-circuit ratio is determined not to enable the system to meet the fault crossing characteristic requirement.
12. The system of claim 10, wherein at the steady-state operating condition establishment test module, a preset steady-state operating condition establishment condition comprises: before and after the new energy source unit to be tested is accessed, the output of the new energy source unit in the network normally operates according to a set value, the variation range of the voltage of the key bus node is within a preset first variation range, and the variation range of the transmission power of the ultra-high voltage direct current transmission system is within a preset second variation range.
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