CN114062814A - Simulation test method and device for new energy station - Google Patents
Simulation test method and device for new energy station Download PDFInfo
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- CN114062814A CN114062814A CN202111357810.9A CN202111357810A CN114062814A CN 114062814 A CN114062814 A CN 114062814A CN 202111357810 A CN202111357810 A CN 202111357810A CN 114062814 A CN114062814 A CN 114062814A
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Abstract
The invention relates to a simulation test method and a simulation test device for a new energy station, wherein the simulation test method comprises the following steps: testing characteristic parameters, simulating the change of grid-connected point frequency at preset time intervals, and uploading the simulated frequency and load change power; the load increasing/decreasing test calculates response lag time, response time, adjusting time and integral electric quantity and sends the response lag time, the response time, the adjusting time and the integral electric quantity after the load increasing and decreasing frequency modulation actions; the simulation frequency test comprises receiving a simulation frequency command, and performing a load increasing test and a load decreasing test; the in-situ simulation test comprises the steps of applying simulation frequency to a test instrument on site to carry out the test; the online test of the emergency stop comprises exiting the online simulation test according to the received emergency stop instruction. The simulation test method and device for the new energy station provided by the invention provide a technical scheme for performing primary frequency modulation simulation test on the new energy station, and meet the requirement of grid connection of the new energy station on primary frequency modulation.
Description
Technical Field
The invention relates to the technical field of new energy control of an electric power system, in particular to a simulation test method and device for a new energy station.
Background
The primary frequency modulation function is an important content of the grid-connected safety evaluation of the generator set. The new energy stations are widely distributed, so that the stations are inconvenient to debug; the new energy is influenced by the environment, the capacity of outputting active power is easy to generate larger fluctuation, and the active power condition of the reserve is not convenient to be scheduled and mastered in real time; during field debugging, a grid-connected point acquisition loop needs to be opened to apply analog quantity to the new energy rapid power control device, and a closed-loop test cannot be formed by the analog quantity and the change feedback of the grid-connected point.
Disclosure of Invention
Based on the prior art, the invention aims to provide a simulation test method and a simulation test device for a new energy station, which are used for performing primary frequency modulation simulation test on the new energy station so as to meet the primary frequency modulation requirement of grid connection of the new energy station.
In order to achieve the above object, according to one aspect of the present invention, there is provided a simulation test method of a new energy station, the simulation test including a characteristic parameter test, an increase/decrease load test, a simulation frequency test, an in-situ simulation test, and an on-line test scram; wherein the content of the first and second substances,
the characteristic parameter test comprises the steps of simulating the change of grid-connected point frequency at preset time intervals, and uploading the simulated frequency and load change power;
the load increasing/reducing test comprises a load increasing test and a load reducing test, and after the frequency modulation action, the response lag time, the response time, the adjusting time and the integral electric quantity are calculated and are uploaded;
the analog frequency test comprises receiving analog frequency, and performing load increasing test and load decreasing test;
the in-situ simulation test comprises the steps of applying simulation frequency to a test instrument on site to carry out the test;
and the online test emergency stop comprises exiting the online simulation test according to the received emergency stop instruction.
Further, the analog frequency test includes that according to the received analog frequency, after a frequency modulation action, the same information as the load increase/decrease test is uploaded.
Further, by providing a multiplexed AC channel, in-situ simulation testing is performed.
Furthermore, in the local simulation test, when the local simulation test soft pressing plate is put in, the frequency of the multiplexing alternating current channel replaces the grid-connected point frequency to be used as the frequency criterion of the primary frequency modulation action; when the multiplexing alternating current channel control word is put into use, the multiplexing alternating current channel control word is used as a part of the power of the grid-connected point to participate in the calculation of the power of the grid-connected point.
Furthermore, in the local simulation test, when the multiplexing channel voltage is low, the frequency of the multiplexing channel is locked, and the action of primary frequency modulation is not influenced.
Further, the online test emergency stop further comprises switching to a normal operation state after resetting the primary frequency modulation action triggered by the simulation test.
Further, the load change power is calculated according to the following formula:
wherein f isdIs a primary frequency modulation dead zone; f. ofNIs the rated frequency of the system; pNIs rated power; delta% is the primary frequency modulation difference rate of the new energy; p0The initial value of active power.
Furthermore, the characteristic parameter test, the load increase/decrease test and the simulation frequency test are all test completion self-recovery.
Further, the in-place simulation test has a higher priority than the online simulation test.
According to another aspect of the invention, a simulation test device of a new energy station is provided, which comprises a characteristic parameter test module, an increasing/decreasing load test module, a simulation frequency test module, a local simulation test module and an online test emergency stop module; wherein the content of the first and second substances,
the characteristic parameter testing module is used for simulating the change of the grid-connected point frequency at preset time intervals and sending the simulated frequency and the load change power up;
the load increasing/reducing test module comprises a load increasing test unit and a load reducing test unit and is used for testing the response characteristics of the new energy station, calculating response lag time, response time, adjusting time and integral electric quantity and uploading the response lag time, the response time, the adjusting time and the integral electric quantity;
the analog frequency testing module is used for receiving analog frequency and carrying out load increasing testing and load reducing testing;
the in-situ simulation test module is used for applying simulation frequency to test through a tester on site; and the online test emergency stop module is used for quitting the online simulation test according to the received emergency stop instruction.
In summary, the invention provides a simulation test method and a device for a new energy station, wherein the simulation test method comprises a characteristic parameter test, a load increase/decrease test, a simulation frequency test, an in-situ simulation test and an on-line test emergency stop; the characteristic parameter test comprises simulating the change of grid-connected point frequency at preset time intervals, and uploading the simulated frequency and load change power; the load increasing/reducing test comprises a load increasing test and a load reducing test, and is used for testing the response characteristics of the new energy station, calculating the response lag time, the response time, the adjusting time and the integral electric quantity and uploading the response lag time, the response time, the adjusting time and the integral electric quantity; the analog frequency test comprises receiving analog frequency, and performing load increasing test and load decreasing test; the in-situ simulation test comprises the steps of applying simulation frequency to a test instrument on site to carry out the test; the online test of the emergency stop comprises exiting the online simulation test according to the received emergency stop instruction. The simulation test method and device for the new energy station provided by the invention provide a technical scheme for performing primary frequency modulation simulation test on the new energy station, and can meet the requirement of grid connection of the new energy station on primary frequency modulation.
Drawings
FIG. 1 is a droop curve of a wind power plant participating in primary frequency modulation of a power grid;
FIG. 2 is a flow chart of a characteristic parameter test;
FIG. 3 is a flow chart of an increase/decrease load test;
FIG. 4 is a diagram of the logical relationship between test functions.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the accompanying drawings in conjunction with the following detailed description. It should be understood that the description is intended to be exemplary only, and is not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
The technical solution of the present invention will be described in detail below with reference to the accompanying drawings. According to one embodiment of the invention, a simulation test method of a new energy station is provided, wherein the simulation test comprises characteristic parameter test, load increase/decrease test, simulation frequency test, in-situ simulation test and on-line test emergency stop. The following describes each test in detail.
The characteristic parameter test comprises the steps of simulating the change of grid-connected point frequency at preset time intervals, and uploading the simulated frequency and load change power. The new energy station comprises a wind power plant, a photovoltaic power plant and the like, and active-frequency droop characteristic control is realized by reserving active standby or configuring energy storage equipment and utilizing a corresponding active control system or additionally installing an independent control device. The primary frequency modulation droop characteristic is realized by setting a broken line function of frequency and active power, namely:
wherein f isdIs a primary frequency modulation dead zone (Hz); f. ofNA system rated frequency (Hz); pNRated power (MW); delta% is the primary frequency modulation difference rate of the new energy; p0Is the initial value (MW) of active power.
Fig. 1 shows a droop curve of a wind power plant participating in primary frequency modulation of a power grid, taking the droop curve in fig. 1 as an example, a primary frequency modulation dead zone is set to be 0.05Hz, a difference modulation rate is set to be 2%, and a maximum load amplitude limit is set to be not less than 10% of a rated load. The primary frequency modulation dead zone, the system rated frequency, the rated power, the difference modulation rate and the initial value of the active power in the formula are droop characteristic parameters. In order to obtain these parameters, a plurality of measurement values in fig. 1 need to be obtained, and in order to facilitate scheduling, a characteristic parameter test function is provided in the embodiment of the present invention.
Fig. 2 shows a flow chart of characteristic parameter testing, in which a remote control command issued by a schedule is received by a gateway device, a characteristic parameter testing function is entered, changes of a grid-connected point frequency are simulated once every 1 second, changes are made from 49.7Hz to 50.3Hz, a step length is 0.005Hz, and the simulated frequency and a load change power are uploaded to the schedule by the gateway device, for example, the load change power is calculated according to the above formula and uploaded to the schedule, so that a sufficient measurement value is provided for the schedule. In the whole test process, the primary frequency modulation function is not triggered, and the AGC regulation function is not influenced. To prevent the operator from forgetting to exit the characteristic parameter test, the test function is set to test completion self-regressions.
The load increasing/reducing test comprises a load increasing test and a load reducing test, and after the load increasing and load reducing frequency modulation actions, the response lag time, the response time, the adjusting time and the integral electric quantity are calculated and are uploaded. And in order to master the frequency modulation capability of the new energy station, the new energy station is required to be carried to actually adjust the power of the grid-connected point. Fig. 3 shows a flow chart of the load increase/decrease test, in which two remote control points are set for facilitating the scheduled test, and the load increase test and the load decrease test correspond to the analog frequencies of 49.75Hz and 50.25Hz, respectively. After the actual primary frequency modulation action, calculating response lag time, response time, adjustment time and integral electric quantity, and uploading the response lag time, the response time, the adjustment time and the integral electric quantity for scheduling for reference. The frequency modulation of the new energy station can be finished within 15 seconds generally, and in order to prevent an operator from forgetting to quit the test function, the self-resetting is set for 30 seconds.
The analog frequency test comprises receiving analog frequency, and performing load increasing test and load decreasing test. In order to meet the requirement of scheduling on a new energy station, a remote regulation function is added, and the scheduling can directly send down the analog frequency. The operation is divided into two steps, firstly, a remote test function is entered through remote control simulation test, and the initialization simulation frequency is 50 Hz; waiting for dispatching to issue analog frequency, and after a frequency modulation action, uploading the same information as the load increasing/decreasing test. In order to prevent an operator from forgetting to quit the test function, a self-reset time fixed value (default 900 seconds) is set, and the simulation test remote control in the section not only controls the issuing of the simulation frequency, but also controls the enabling of the characteristic parameter test and the load increasing/decreasing test as the total function.
In-situ simulation testing involves applying a simulation frequency to the test site via a tester. Before the new energy control device is put into operation, debugging personnel can go to the scene and debug, and analog frequency needs to be applied through a tester, and in order to meet the requirement, a local analog test function needs to be set. The device is additionally provided with 1 multiplexing alternating current channel besides 1 grid-connected point alternating current channel, and on one hand, the device can be used as a standby channel for collecting the alternating current quantity of the grid-connected point; and on the other hand as applying an analogue frequency. When the 'in-situ simulation test' soft pressing plate is put into use, the alternating current quantity of the alternating current channel is reused to replace the frequency of a grid-connected point, and the frequency is used as a frequency criterion of primary frequency modulation action; and under the condition that the multiplexing channel control word is put into use, the multiplexing channel control word is used as a part of the power of the grid-connected point to participate in the calculation of the power of the grid-connected point. In order to prevent debugging personnel from forgetting to quit the 'local simulation test', when the multiplexing channel voltage is low, the frequency of the multiplexing channel is locked, and the action of primary frequency modulation is not influenced any more.
And the online test emergency stop exits the online simulation test according to the received emergency stop instruction. Scheduling in performing simulation testing, there are cases where testing needs to be stopped immediately. In order to meet the requirement of emergency stop, a direct control function of 'on-line test emergency stop' is set. When the emergency stop command is issued in the dispatching mode, the device quits the on-line simulation test, and switches to the normal running state after the primary frequency modulation action triggered by the simulation test is reset.
The logical relationship between the above test functions is shown in fig. 4, wherein the in-place simulation test has a higher priority than the in-line simulation test, which is forced to be reset in case of the in-place simulation test being put into practice.
According to another embodiment of the invention, a simulation test device of a new energy station is provided, which comprises a characteristic parameter test module, an increasing/decreasing load test module, a simulation frequency test module, an on-site simulation test module and an on-line test emergency stop module.
The characteristic parameter testing module is used for simulating the change of the grid-connected point frequency at preset time intervals and sending the simulated frequency and the load change power up;
the load increasing/reducing test module comprises a load increasing test unit and a load reducing test unit, and is used for quickly realizing load increasing test and load reducing test, and calculating and uploading response lag time, response time, adjusting time and frequency modulation integral electric quantity;
the analog frequency testing module is used for receiving analog frequency and carrying out load increasing testing and load reducing testing;
the in-situ simulation test module is used for applying simulation frequency to test through a tester on site; and the online test emergency stop module is used for quitting the online simulation test according to the received emergency stop instruction.
The steps of implementing the functions of the modules in the apparatus according to this embodiment of the present invention are the same as those in the first embodiment of the present invention, and are not described herein again.
In summary, the present invention relates to a simulation test method and apparatus for a new energy station, the simulation test method includes a characteristic parameter test, an increase/decrease load test, a simulation frequency test, an in-situ simulation test, and an on-line test emergency stop; the characteristic parameter test comprises simulating the change of grid-connected point frequency at preset time intervals, and uploading the simulated frequency and load change power; the load increasing/reducing test comprises a load increasing test and a load reducing test, and comprises the steps of calculating response lag time, response time, adjusting time and integral electric quantity and uploading the response lag time, the response time, the adjusting time and the integral electric quantity after the load increasing and load reducing frequency modulation actions; the analog frequency test comprises receiving analog frequency, and performing load increasing test and load decreasing test; the in-situ simulation test comprises the steps of applying simulation frequency to a test instrument on site to carry out the test; the online test of the emergency stop comprises exiting the online simulation test according to the received emergency stop instruction. The simulation test method and device for the new energy station provided by the invention provide a technical scheme for performing primary frequency modulation simulation test on the new energy station, and can meet the requirement of grid connection of the new energy station on primary frequency modulation.
It is to be understood that the above-described embodiments of the present invention are merely illustrative of or explaining the principles of the invention and are not to be construed as limiting the invention. Therefore, any modification, equivalent replacement, improvement and the like made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. Further, it is intended that the appended claims cover all such variations and modifications as fall within the scope and boundaries of the appended claims or the equivalents of such scope and boundaries.
Claims (10)
1. A simulation test method of a new energy station is characterized in that the simulation test comprises a characteristic parameter test, an increase/decrease load test, a simulation frequency test, an on-site simulation test and an on-line test scram; wherein the content of the first and second substances,
the characteristic parameter test comprises the steps of simulating the change of grid-connected point frequency at preset time intervals, and uploading the simulated frequency and load change power;
the load increasing/reducing test comprises a load increasing test and a load reducing test, is used for testing the response characteristic of the new energy station, and calculates and transmits response lag time, response time, adjusting time and integral electric quantity;
the analog frequency test comprises receiving analog frequency, and performing load increasing test and load decreasing test;
the in-situ simulation test comprises the steps of applying simulation frequency to a test instrument on site to carry out the test;
and the online test emergency stop comprises exiting the online simulation test according to the received emergency stop instruction.
2. The method of claim 1, wherein the analog frequency test comprises uploading the same information as the add/drop load test after a single frequency tuning action based on the received analog frequency.
3. The method of claim 1, wherein the in-situ analog testing applies analog frequency by providing a multiplexed ac channel.
4. The method according to claim 3, characterized in that in the in-situ simulation test, when the 'in-situ simulation test' soft pressing plate is put into operation, the frequency of the multiplexing alternating current channel is used as a frequency criterion of primary frequency modulation action instead of the grid-connected point frequency; when the multiplexing alternating current channel control word is put into use, the multiplexing alternating current channel control word is used as a part of the power of the grid-connected point to participate in the calculation of the power of the grid-connected point.
5. The method of claim 4, wherein in the in-situ simulation test, when the multiplexed channel voltage is low, the frequency of the multiplexed channel is locked out and does not affect the primary frequency modulation.
6. The method of claim 1, wherein the online test scram further comprises switching to a normal operating state after resetting a primary frequency modulation action triggered by the analog test.
7. The method of claim 1, wherein the load change power is calculated according to the following formula:
wherein f isdIs a primary frequency modulation dead zone; f. ofNIs the rated frequency of the system; pNIs rated power; delta% is the primary frequency modulation difference rate of the new energy; p0The initial value of active power.
8. The method of claim 1, wherein the characteristic parameter test, the increase/decrease load test, and the analog frequency test are all test completion self-regressions.
9. The method of claim 1, wherein the in-place simulation test is prioritized over the in-line simulation test and is forced to exit if enabled.
10. A simulation test device of a new energy station is characterized by comprising a characteristic parameter test module, an increasing/decreasing load test module, a simulation frequency test module, a local simulation test module and an on-line test emergency stop module; wherein the content of the first and second substances,
the characteristic parameter testing module is used for simulating the change of the grid-connected point frequency at preset time intervals and sending the simulated frequency and the load change power up;
the load increasing/reducing test module comprises a load increasing test unit and a load reducing test unit, is used for testing the response characteristics of the new energy station, calculating response lag time, response time, adjusting time and integral electric quantity and uploading the response lag time, the response time, the adjusting time and the integral electric quantity;
the analog frequency testing module is used for receiving analog frequency and carrying out load increasing testing and load reducing testing;
the in-situ simulation test module is used for applying simulation frequency to test through a tester on site;
and the online test emergency stop module is used for quitting the online simulation test according to the received emergency stop instruction.
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| CN106655159A (en) * | 2016-10-27 | 2017-05-10 | 中国电力科学研究院 | New energy power station primary frequency modulation capability testing system and testing method thereof |
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| CN111711230A (en) * | 2020-07-08 | 2020-09-25 | 江苏方天电力技术有限公司 | Online real-time monitoring method for primary frequency modulation capability of new energy station |
| CN113219278A (en) * | 2021-04-20 | 2021-08-06 | 国网江苏省电力有限公司电力科学研究院 | Primary frequency modulation test system and method for new energy station |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106655159A (en) * | 2016-10-27 | 2017-05-10 | 中国电力科学研究院 | New energy power station primary frequency modulation capability testing system and testing method thereof |
| CN107976592A (en) * | 2017-10-25 | 2018-05-01 | 国电南瑞科技股份有限公司 | Unit primary frequency modulation on-line testing method based on wide area measurement information |
| CN111711230A (en) * | 2020-07-08 | 2020-09-25 | 江苏方天电力技术有限公司 | Online real-time monitoring method for primary frequency modulation capability of new energy station |
| CN113219278A (en) * | 2021-04-20 | 2021-08-06 | 国网江苏省电力有限公司电力科学研究院 | Primary frequency modulation test system and method for new energy station |
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