CN107359626B - Subsynchronous oscillation control method for large-scale new energy base power grid - Google Patents
Subsynchronous oscillation control method for large-scale new energy base power grid Download PDFInfo
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Abstract
The invention discloses a subsynchronous oscillation control method for a large-scale new energy base power grid. Belonging to the field of power system automation. The method comprises the steps of firstly, collecting three-phase current and voltage of all lines on high and low voltage sides of a transformer substation or a new energy station, carrying out signal processing on each line, and monitoring subsynchronous oscillation power phasor of each line; determining whether control measures need to be taken or not according to the subsynchronous oscillation power characteristics of the high-voltage side line, and calculating the phasor sum of subsynchronous oscillation power of all lines on the high-voltage side; and comparing the contribution degree of each line at the low-voltage side to the subsynchronous oscillation amplitude value at the high-voltage side, determining whether the line at the low-voltage side needs to be cut off, and cutting off the line at the low-voltage side according to the contribution degree if the line at the low-voltage side needs to be cut off. The invention can make decision judgment only by collecting local information of a single transformer substation or a new energy station, can realize subsynchronous oscillation monitoring of a specific area, can realize hierarchical control of the whole power grid by depending on wide-area information networking, and can be flexibly implemented according to actual engineering.
Description
Technical Field
The invention belongs to the technical field of power system automation, and particularly relates to a sub-synchronous oscillation control method for a large-scale new energy base power grid.
Background
Under the guidance of 'two alternatives', new energy development in China is rapidly developed in recent years, the installed new energy of a national grid company system breaks through 1 hundred million kilowatts, the wind power and photovoltaic grid-connected capacity surpasses the top of the world, particularly the 'three-north' area has huge development and utilization potential, and a plurality of large-scale new energy bases are formed at present. The method is characterized in that the new energy power generation in China needs to be transmitted to the load center of the middle east part through ultra/extra-high voltage long-distance transmission, subsynchronous oscillation is possible to occur under the action of various factors such as a wind power generator inverter, SVC, SVG, direct current transmission and series compensation capacitance, the subsynchronous oscillation risk of the system is remarkably increased along with the increasing permeability of the wind power of the northwest power grid, and the large-scale new energy base which is put into operation at present has a phenomenon of multiple subsynchronous oscillation, so that the safe and stable operation of the power grid is seriously influenced.
Most of the existing analysis methods for subsynchronous oscillation are offline analysis based on PMU recorded broadcast data after an accident, or only detect whether subsynchronous oscillation occurs in a certain area, and cannot take effective control measures online. In a research stage, domestic manufacturers successively put forward a subsynchronous oscillation control system and a subsynchronous oscillation control method based on a power oscillation principle and a torsional oscillation protection principle, the control strategy is usually to separate key units or lines, or to gradually cut off the new energy station based on the size of the oscillation amplitude of the new energy station tentatively, the economic performance of the new energy station and the oscillation coupling relation between the new energy station and a power grid are not considered, and the application effect is poor. Therefore, it is necessary to develop a new subsynchronous oscillation control method suitable for a large-scale new energy base.
Disclosure of Invention
The invention aims to solve the problem of subsynchronous oscillation of an existing large-scale new energy base and provides a subsynchronous oscillation control method based on the oscillation contribution degree of a new energy station. According to the method, on the basis of real-time monitoring of the high-low voltage side of a large-scale new energy base substation or a new energy station, a method for gradually cutting off the low-voltage side line is calculated by comparing oscillation characteristics of two sides, and effective control of sub-synchronous oscillation of a large-scale new energy base power grid can be achieved.
Specifically, the invention specifically adopts the following technical scheme, which comprises the following steps:
1) monitoring three-phase current and voltage of all lines on high and low voltage sides of a transformer substation or a new energy station in real time, calculating real-time power, and performing subsynchronous component detection on the power;
2) judging whether the subsynchronous component of power in the electrical quantity of any line at the high-voltage side meets the action condition, and recording the frequency f of the subsynchronous component if the subsynchronous component of power in the electrical quantity of any line at the high-voltage side meets the action conditionSSOAnd continuing to step 3), otherwise, exiting the method;
3) extracting the frequency f in all lines at the high-voltage sideSSOPower subsynchronous component of (a), calculating phasor sum
4) Calculating each line pair on low-voltage side
The degree of contribution of (c);
5) if the maximum value contr of the contribution degrees obtained in the step 4)maxIf the value is larger than the set threshold value, judging that control measures need to be taken, and continuing to step 6), otherwise, exiting the method;
6) and cutting off the low-voltage side line with the highest contribution degree according to the sequence of the contribution degrees of the low-voltage side lines from large to small.
The above technical solution is further characterized in that, in the step 2), the method for determining whether the power sub-synchronization component satisfies the action condition includes: setting the upper and lower limits of the frequency range of the subsynchronous component, the amplitude threshold of the power subsynchronous component and the action time threshold, and when the amplitude of the power subsynchronous component in the electric quantity of a certain line is greater than the set threshold value and the frequency f of the subsynchronous componentSSOAnd if the duration time is within the set range and exceeds the action time threshold, the action condition is considered to be met.
The technical scheme is further characterized in that in the step 4), each line pair on the low-voltage side
The contribution calculating method comprises the following steps:
wherein, contriIs the contribution of the ith low-side line,
is the sub-synchronous power phasor of the ith low-voltage side line
Projection of (2); r isaveiIs the average rotation speed of the wind field connected to the ith low-voltage side line, and if there is no wind field under the line, r is setaveiIs 1; lenbaseiIs the reference i low-voltage side line length, which is equal to the i low-voltage side line actual length divided by the longest low-voltage side line length; k1，K2Is a weight coefficient set in advance, and the value of the weight coefficient is not more than 0.2.
The technical scheme is further characterized in that each line on the high-voltage side to be monitored can be replaced by monitoring the high-voltage sides of all main transformers.
The invention has the following beneficial effects: the method solves the problem of subsynchronous oscillation of the existing large-scale new energy base, can quickly identify subsynchronous oscillation occurring in the power grid, and takes control measures according to the contribution degree of each new energy station. The method can be applied to large-scale new energy base substations, booster stations or new energy stations, can make decision judgment by only acquiring local information of a single substation or a new energy station, can realize subsynchronous oscillation monitoring in a specific area, can realize hierarchical control of the whole power grid by depending on wide-area information networking, and can be flexibly implemented according to actual engineering. Greatly saves manpower, material resources and financial resources and improves the automation degree and efficiency.
Drawings
Fig. 1 is a schematic flow chart of a subsynchronous oscillation control method according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a new energy base substation.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1:
as shown in fig. 2, it is assumed that n-loop circuits are arranged on the high-voltage side of a substation of a new energy base to a main network, m-loop power lines are arranged on the low-voltage side of the substation to a new energy station, and the substation has k main transformers.
The implementation process of this embodiment is as shown in fig. 1, and includes first monitoring three-phase currents and voltages of all lines and main transformers on high and low voltage sides of the transformer substation or the new energy station in real time, and calculating real-time power of each line; and FFT analysis is carried out on the real-time power to obtain the sub-synchronous component of the power under each frequency band.
And then, judging whether a certain line or a power subsynchronous component in the main transformer electrical quantity of a certain line exists on the high-voltage side or not, if so, continuing the following steps, otherwise, quitting:
(a) the amplitude of the power subsynchronous component is larger than a set threshold value;
(b) subsynchronous component frequency fSSOWithin a set range;
(c) the duration in which the conditions (a) and (b) are satisfied exceeds a set time threshold.
Next, the frequency f in all the lines on the high-voltage side is extractedSSOPower subsynchronous component of
Calculating the sum of phasors
Or extracting the frequency f at the high-voltage side of the main transformerSSOPower subsynchronous component of
Then
Extraction of fSSOSub-synchronous power phasor of each line at low-voltage side under frequency band
Respectively calculate the pairs
Contribution degree contr of1,contr2，……，contrm. Wherein the low voltage side of each circuit pair
The contribution calculating method comprises the following steps:
wherein, contriIs the contribution of the ith low-side line,
is the sub-synchronous power phasor of the ith low-voltage side line
Projection of (2); r isaveiIs the average rotation speed of the wind field connected to the ith low-voltage side line, and if there is no wind field under the line, r is setaveiIs 1; lenbaseiIs the reference i low-voltage side line length, which is equal to the i low-voltage side line actual length divided by the longest low-voltage side line length; k1，K2Is a weight coefficient set in advance, and the value of the weight coefficient is not more than 0.2.
Further calculating the maximum value contr of contribution degree of each line at the low-voltage sidemax＝max{contriIf cotrmaxIf the threshold value is larger than the set threshold value, judging that control measures need to be taken, otherwise, quitting;
finally, contr1,contr2，……，contrmAnd cutting off the low-voltage side line with the largest contribution degree according to the sequence from large to small.
Although the present invention has been described in terms of the preferred embodiment, it is not intended that the invention be limited to the embodiment. Any equivalent changes or modifications made without departing from the spirit and scope of the present invention also belong to the protection scope of the present invention. The scope of the invention should therefore be determined with reference to the appended claims.
Claims (4)
1. A subsynchronous oscillation control method for a large-scale new energy base power grid is characterized by comprising the following steps:
1) monitoring three-phase current and voltage of all lines on high and low voltage sides of a transformer substation or a new energy station in real time, calculating real-time power, and performing subsynchronous component detection on the power;
2) judging whether the subsynchronous component of power in the electrical quantity of any line at the high-voltage side meets the action condition, and recording the frequency f of the subsynchronous component if the subsynchronous component of power in the electrical quantity of any line at the high-voltage side meets the action conditionSSOAnd continuing to step 3), otherwise, exiting the method;
3) extracting the frequency f in all lines at the high-voltage sideSSOPower subsynchronous component of (a), calculating phasor sum
Setting the frequency of all lines at the high-voltage side to be fSSOPower subsynchronous component of
Then phasor and
4) calculating each line pair on low-voltage side
I.e. extracting fSSOLow voltage side in frequency bandSub-synchronous power phasor of each line
Respectively calculate the pairs
Contribution degree contr of1,contr2，……，contrm；
5) If the maximum value contr of the contribution degrees obtained in the step 4)maxIf the value is larger than the set threshold value, judging that control measures need to be taken, and continuing to step 6), otherwise, exiting the method;
6) and cutting off the low-voltage side line with the highest contribution degree according to the sequence of the contribution degrees of the low-voltage side lines from large to small.
2. The method for controlling subsynchronous oscillation of a large-scale new energy base power grid according to claim 1, wherein in the step 2), the method for determining whether the power subsynchronous component satisfies the action condition comprises: setting the upper and lower limits of the frequency range of the subsynchronous component, the amplitude threshold of the power subsynchronous component and the action time threshold, and when the amplitude of the power subsynchronous component in the electric quantity of a certain line is greater than the set threshold value and the frequency f of the subsynchronous componentSSOAnd if the duration time is within the set range and exceeds the action time threshold, the action condition is considered to be met.
3. The large-scale new energy base power grid subsynchronous oscillation control method of claim 1, wherein the step 4) low-voltage side line pairs
The contribution calculating method comprises the following steps:
wherein, contriIs the contribution of the ith low-side line,
is the sub-synchronous power phasor of the ith low-voltage side line
Projection of (2); r isaveiIs the average rotation speed of the wind field connected to the ith low-voltage side line, and if there is no wind field under the line, r is setaveiIs 1; lenbaseiIs the reference i low-voltage side line length, which is equal to the i low-voltage side line actual length divided by the longest low-voltage side line length; k1，K2Is a weight coefficient set in advance, and the value of the weight coefficient is not more than 0.2.
4. The method for controlling subsynchronous oscillation of a grid of a large-scale new energy base according to any one of claims 1 to 3, wherein lines on the high-voltage side to be monitored can be replaced by monitoring the high-voltage sides of all main transformers.
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| CN110021962B (en) * | 2019-05-06 | 2020-10-27 | 河北新天科创新能源技术有限公司 | Method and device for determining oscillation coupling frequency of new energy grid-connected system |
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| CN114285011B (en) * | 2021-12-22 | 2024-06-18 | 南京南瑞继保电气有限公司 | Multi-band secondary/super-synchronous oscillation area overall cutting machine method and system thereof |
| CN114928075B (en) * | 2022-05-23 | 2024-05-07 | 国家电网有限公司华东分部 | Control method of subsynchronous oscillation based on instantaneous active power of power grid line |
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