CN109713680B - Regional power grid voltage rapid adjustment method based on improved sensitivity method - Google Patents
Regional power grid voltage rapid adjustment method based on improved sensitivity method Download PDFInfo
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Abstract
The invention provides a regional power grid voltage rapid regulation method based on an improved sensitivity method, which is characterized in that voltage sensitivity of each point caused by the switching-in and switching-out of regional power grid reactive equipment is taken as a basis, the improved sensitivity of each voltage monitoring point of the regional power grid is taken as a sequence, voltage of each point of the regional power grid reactive equipment is accurately and rapidly predicted, voltage change of each point of the regional power grid after the switching-in and switching-out of each reactive equipment can be more accurately predicted, a regional power grid voltage regulation optimal scheme meeting specific voltage requirements is further obtained, a rapid regional power grid voltage regulation suggestion is provided for operating personnel, the problem that the actual power grid voltage regulation excessively depends on the operation current situation of a dispatcher is solved, and the safe and stable operation of regional power grid voltage can be guaranteed.
Description
Technical Field
The invention relates to the technical field of power grid voltage regulation, in particular to a regional power grid voltage rapid regulation method based on an improved sensitivity method.
Background
Along with the cross-country interconnection of power systems, the scale of power grids is larger and larger, and when a cooperation agreement is signed for the power grids sent to foreign regions, clear index requirements are often provided for the voltage and the power factor of a boundary station, the power grids belong to respective scheduling mechanisms of two countries, the load and power source prediction of each other is lacked, the power grids are similar to black boxes relative to the other power grid, and the scheduling departments need to quickly respond to the change of the black box power grids so as to meet the index requirements of the boundary station. Therefore, maintaining the safe and stable operation of the voltage of the transnational power grid is particularly important for transnational power transmission.
However, it is difficult for dispatchers to take effective measures for fast dispatch and decision making for such black box power grids as well as for international cooperative area power grids. In the prior art, a BPA simulation method based on an actual power grid operation mode is too complicated and is difficult to complete in a short time.
Disclosure of Invention
The invention provides a regional power grid voltage rapid adjustment method based on an improved sensitivity method, which aims to solve the problems that the conventional power grid voltage adjustment method is too complicated and is difficult to complete in a short period, and the boundary node voltage cannot meet the protocol requirement for a long time due to unpredictable voltage and reactive fluctuation of a power grid on the opposite side across the country.
The invention provides a regional power grid voltage rapid adjustment method based on an improved sensitivity method, which comprises the following steps:
calculating reactive equipment and reactive compensation capacity of regional power grid stations, wherein the calculation comprises the step of classifying and summarizing capacitors and reactors of the regional power grid stations, and the phase delay and phase advance capacity of power plants;
searching a historical operation lowest point of the boundary node voltage through an OCS system, backtracking regional power grid load flow based on BPA simulation according to OCS system data, inputting reactive capacitive equipment of a single plant station, and recording a voltage initial value and a voltage value of each voltage detection point when the reactive capacitive equipment of the plant station is gradually added;
calculating the voltage sensitivity of each voltage monitoring point of the station reactive capacitive equipment;
searching a historical operation highest point of the boundary node voltage through an OCS system, backtracking the regional power grid load flow based on BPA simulation according to OCS system data, putting reactive inductive equipment of a single plant station, and recording the initial voltage value and the voltage value of each voltage detection point when the plant station reactive inductive equipment is put in an increasing mode;
calculating the voltage sensitivity of each voltage monitoring point of the on-off of the inductive equipment of the plant station;
when the regional power grid is put into capacitive reactive power, the improved voltage sensitivity of the capacitor of the ith transformer substation for switching on and off the jth substation is as follows:
when the regional power grid is put into inductive reactive power, the improved voltage sensitivity of the reactor of the ith transformer substation for switching on and off the jth substation is as follows:
wherein the content of the first and second substances,
in order to be the voltage sensitivity,
to calculate
The initial voltage of the capacitor,
the actual voltage value at the moment is the power grid;
generating an improved sensitivity sequence for switching of reactive equipment of each station of a regional power grid;
and generating a regional power grid voltage regulation scheme meeting the voltage requirement according to the improved sensitivity sequence.
In one embodiment of the invention, the voltage sensitivity is
Has the following relation:
wherein k is an integer greater than 1.
In one embodiment of the present invention, further comprising: the voltage value of the jth station after the capacitive reactive power equipment of p stations is put into use is:
in one embodiment of the present invention, further comprising: the voltage value of the jth plant station after the inductive reactive equipment of p plant stations is put into use is:
in one embodiment of the invention, generating a regional grid voltage adjustment scheme to meet voltage requirements according to an improved sensitivity sequence comprises: the following optimization algorithm is adopted to obtain the effect that the j node voltage reaches the expected value
The simplest voltage regulation scheme is as follows:
wherein the content of the first and second substances,
and the voltage is the final voltage per unit value of the ith voltage monitoring point.
The method for quickly adjusting the voltage of the regional power grid based on the improved sensitivity method is based on the voltage sensitivity of each point caused by the switching-in and switching-out of reactive power equipment of the regional power grid, takes the improved sensitivity of each voltage monitoring point of the regional power grid as a sequence, accurately and quickly predicts the voltage of each point of the regional power grid after the switching-in and switching-out of the reactive power equipment, can more accurately predict the voltage change of each point of the regional power grid after the switching-in and switching-out of the reactive power equipment, further obtains an optimal scheme for adjusting the voltage of the regional power grid meeting specific voltage requirements, provides a quick suggestion for adjusting the voltage of the regional power grid for operating personnel, solves the problem that the actual voltage adjustment of the regional power grid excessively depends on the current operation situation of a dispatcher, and can ensure the safe and stable operation of the voltage of the regional power grid.
Detailed Description
The original regional power grid voltage regulation method is used for switching on and off a capacitor or an electric reactor according to the operation experience of a dispatcher, so that the purpose of voltage regulation is difficult to achieve and the voltage of each point of a regional power grid is not out of limit. If a simulation method is adopted for auxiliary decision making, the power flow and voltage of the power grid need to be traced back, and the simulation software is difficult to quickly trace the voltage and reactive power distribution of the power grid at the moment. The embodiment of the invention provides a regional power grid voltage rapid adjustment method based on an improved sensitivity method, which can effectively solve the defect that the voltage prediction of the traditional sensitivity method is not accurate enough, and comprises the following steps:
s1: and (3) counting the reactive power equipment and reactive power compensation capacity of the regional power grid stations, wherein the step of classifying and summarizing the capacitors and reactors of all the regional power grid stations, the delay and phase advance capacity of power plants.
Statistical analysis is carried out on the reactive equipment and the reactive capacity of the regional power grid of 220kV or more, and the statistical analysis comprises the step of classifying and summarizing the capacitors and reactors of all power grid stations in the region, the delay and phase advance capacity of power plants. And (4) defining regional power grid voltage monitoring points, wherein the voltage monitoring points comprise stations with reactive equipment.
S2: searching the historical operation lowest point of the boundary node voltage through an OCS system, backtracking regional power grid load flow based on BPA simulation according to OCS system data, inputting reactive capacitive equipment of a single plant station, and recording the voltage initial value and the voltage value of each voltage detection point when the reactive capacitive equipment of the plant station is gradually added.
S3: and calculating the voltage sensitivity of each voltage monitoring point of the on-off of the inductive equipment of the station.
Searching historical operation lowest points of the boundary node voltages through an OCS (electric network operation monitoring system), tracing regional electric network load flow based on BPA simulation according to OCS system data, putting reactive capacitive equipment (transformer substation capacitors and power plant delayed phase operation) of a single plant station on the basis of the mode, and recording initial voltage values of all voltage detection points when the reactive capacitive equipment of the plant station is gradually put into the plant station in an increasing mode
And a voltage value, wherein m is the number of power plants, n is the number of substations,
for the initial voltage of the m power plants,
for n substation initial voltages. The voltage of each monitoring point of the reactive equipment on/off is shown in table 1.
TABLE 1 i Voltage of each monitoring point of on/off state of capacitor of transformer substation
Calculating the average value of the voltage increment of each voltage monitoring node, namely the voltage sensitivity of each point of the i-th transformer substation capacitor for switching on and off and the voltage sensitivity of the i-th transformer substation capacitor for switching on and off the j-th station
Has the following relation:
wherein k is an integer greater than 1.
And then sequentially calculating the voltage sensitivity of each voltage monitoring point of the reactive capacitive equipment of other stations.
S4: searching a historical operation highest point of the boundary node voltage through an OCS system, tracing regional power grid load flow based on BPA simulation according to OCS system data, inputting reactive inductive equipment of a single plant station, and recording a voltage initial value and a voltage value of each voltage detection point when the reactive inductive equipment of the plant station is gradually added.
S5: and calculating the voltage sensitivity of each voltage monitoring point of the on-off of the inductive equipment of the plant station.
Similarly, the highest point of historical operation of the boundary node voltage is searched through the OCS, regional power grid flow backtracking is carried out based on BPA simulation according to OCS data, reactive inductive equipment (a transformer substation reactor and a power plant are operated in a phase-in mode) of a single plant station is input, and the voltage sensitivity of each voltage monitoring point of the reactive inductive equipment of the plant station is calculated in sequence.
S6: when the regional power grid is put into capacitive reactive power, the improved voltage sensitivity of the capacitor of the ith transformer substation for switching on and off the jth substation is as follows:
when the regional power grid is put into inductive reactive power, the improved voltage sensitivity of the reactor of the ith transformer substation for switching on and off the jth substation is as follows:
wherein the content of the first and second substances,
in order to be the voltage sensitivity,
to calculate
Of the voltage of the first voltage of the second voltage,
the actual voltage value at the moment of the power grid.
The sensitivity calculation based on the method is often changed along with the change of the initial voltage, because the regional power grid is still a networking system, the reactive power is enabled to overflow when the initial voltage is too high or too low, when the initial voltage is higher, the capacitive reactive power of the regional power grid with equal capacity is increased (the capacitive reactive power is put into a capacitor or a generator to run in a delayed phase mode), because the voltage is high, the proportion of the reactive power flowing to the adjacent power grid is large, the lifting amplitude of the local voltage is reduced, and namely the voltage sensitivity of each local voltage monitoring point is reduced. Similarly, when the initial voltage is lower, the inductive reactive power of the regional power grid with equal capacity (the input reactance or the generator is put into phase operation) is increased, and the inductive reactive power overflowing into the local power grid by the adjacent power grid is increased, so that the voltage sensitivity of each local voltage monitoring point is reduced.
Therefore, the embodiment of the present invention defines an improved voltage sensitivity, which can more accurately express the actual fluctuation amplitude of the switching and each point voltage of the regional power grid reactive equipment, that is:
when the regional power grid is put into capacitive reactive power, the improved voltage sensitivity of the capacitor of the ith transformer substation for switching on and off the jth substation is as follows:
when the regional power grid is put into inductive reactive power, the improved voltage sensitivity of the reactor of the ith transformer substation for switching on and off the jth substation is as follows:
wherein the content of the first and second substances,
in order to be the voltage sensitivity,
to calculate
The initial voltage of the capacitor,
the actual voltage value at the moment of the power grid.
S7: and generating an improved sensitivity sequence for switching of each station reactive device of the regional power grid.
Through the steps of S1-S6, an improved sensitivity sequence for reactive equipment switching of each station of the regional power grid can be generated, and for the j station, the voltage improved sensitivity sequence is as follows:
s8: and generating a regional power grid voltage regulation scheme meeting the voltage requirement according to the improved sensitivity sequence.
When the regional power grid voltage is adjusted, in order to meet the voltage requirement of a specific plant station, reactive equipment of a plurality of plant stations is switched on and off to carry out comprehensive voltage regulation, and calculation and simulation experience shows that the voltage variation of each monitoring node is not the simple accumulation of the voltage regulation sensitivity of each plant station, and similarly, the voltage sensitivity of each monitoring node is gradually changed along with the increase and decrease of the voltage of the point, and when the system voltage needs to be improved, the voltage sensitivity of each monitoring point is gradually reduced along with the gradual increase of the voltage. When the system voltage needs to be reduced, the voltage sensitivity of each monitoring point is gradually reduced along with the gradual reduction of the voltage. The voltage increase and decrease caused by the switching of the comprehensive reactive power equipment is smaller than the simple accumulated value of the passing sensitivity.
Therefore, in the embodiment of the present invention, the voltage value of the jth plant station after the capacitive reactive device of p plant stations is put into use is:
the voltage value of the jth plant station after inductive reactive equipment of p plant stations is integrated is as follows:
the following optimization algorithm is adopted to obtain the effect that the j node voltage reaches the expected value
The simplest voltage regulation scheme is as follows:
wherein the content of the first and second substances,
the final voltage per unit value of the ith voltage monitoring point is ensuredAfter the over-p step voltage regulation measure, the voltage of each node of the system does not exceed the upper limit and the lower limit, particularly the node for switching the reactive equipment.
Example verification
An example of the improved sensitivity calculated voltage value and simulation value pair of the regional power grid voltage rapid adjustment method based on the improved sensitivity method provided by the embodiment of the invention is shown in table 2.
TABLE 2 comparison of calculated Voltage values with simulated values by improved sensitivity
| Plant station | Calculated value | Simulation value | Extent of deviation | Percent deviation |
| Transformer substation 1 | 235.9 | 233.7 | 0.009326 | 0.93％ |
| Substation 2 | 237.49 | 237.2 | 0.001221 | 0.12％ |
| Power plant 1 | 239.99 | 239 | 0.004125 | 0.41％ |
| Power plant 2 | 247.24 | 245.4 | 0.007442 | 0.74％ |
In summary, the method for rapidly adjusting the voltage of the regional power grid based on the improved sensitivity method provided by the invention is based on the voltage sensitivity of each point caused by the reactive power equipment switching on and off of the regional power grid, takes the improved sensitivity of each voltage monitoring point of the regional power grid as a sequence, accurately and rapidly predicts the voltage change of each point of the regional power grid after the reactive power equipment switching on and off, and further obtains the optimal scheme for adjusting the voltage of the regional power grid meeting the specific voltage requirement, provides a rapid suggestion for adjusting the voltage of the regional power grid for operating personnel, solves the problem that the actual voltage adjustment of the regional power grid excessively depends on the current operation situation of a dispatcher, and can ensure the safe and stable operation of the voltage of the regional power grid.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (5)
1. A regional power grid voltage rapid regulation method based on an improved sensitivity method is characterized by comprising the following steps:
counting reactive power equipment and reactive power compensation capacity of regional power grid stations, wherein the reactive power equipment and reactive power compensation capacity comprise classifying and summarizing capacitors and reactors of all power grid stations in a region, and the slow phase and incoming phase capabilities of power plants;
searching a historical operation lowest point of the boundary node voltage through an OCS system, backtracking regional power grid load flow based on BPA simulation according to OCS system data, inputting reactive capacitive equipment of a single plant station, and recording a voltage initial value and a voltage value of each voltage detection point when the reactive capacitive equipment of the plant station is gradually added;
calculating the voltage sensitivity of each voltage monitoring point of the station reactive capacitive equipment;
searching a historical operation highest point of the boundary node voltage through an OCS system, tracing regional power grid load flow based on BPA simulation according to OCS system data, inputting reactive inductive equipment of a single plant, and recording a voltage initial value and a voltage value of each voltage detection point when the reactive inductive equipment of the plant is gradually added;
calculating the voltage sensitivity of each voltage monitoring point of the on-off of the inductive equipment of the plant station;
when the regional power grid is put into capacitive reactive power, the improved voltage sensitivity of the capacitor of the ith transformer substation for switching on and off the jth substation is as follows:
when the regional power grid is put into inductive reactive power, the improved voltage sensitivity of the reactor of the ith transformer substation for switching on and off the jth substation is as follows:
wherein, the first and the second end of the pipe are connected with each other,
in order to be the voltage sensitivity,
to calculate
The initial voltage of the capacitor,
the actual voltage value at the moment of the power grid is obtained;
generating an improved sensitivity sequence for switching of reactive equipment of each station of a regional power grid;
and generating a regional power grid voltage regulation scheme meeting the voltage requirement according to the improved sensitivity sequence.
2. The method for rapidly adjusting the voltage of a regional power grid based on the improved sensitivity method as claimed in claim 1, wherein the voltage sensitivity is
Has the following relation:
k is an integer larger than 1, and k is the number of capacitors/reactors of the ith transformer substation;
putting the voltage value of the j station of the q group of capacitors/reactors into the i substation;
and putting the voltage value of the j station of the q-1 group of capacitor/reactor into the i substation.
3. The method for rapidly adjusting the voltage of the regional power grid based on the improved sensitivity method as claimed in claim 1, further comprising: the voltage value of the jth station after the capacitive reactive power equipment of p stations is put into use is:
4. the method for rapidly adjusting the voltage of the regional power grid based on the improved sensitivity method as claimed in claim 3, further comprising: the voltage value of the jth plant station after inductive reactive equipment of p plant stations is integrated is as follows:
5. the improved sensitivity method-based regional power grid voltage rapid adjustment method according to claim 4, wherein the step of generating a regional power grid voltage adjustment scheme meeting the voltage requirement according to the improved sensitivity sequence comprises: the following optimization algorithm is adopted to obtain the effect that the j node voltage reaches the expected value
The simplest voltage regulation scheme is as follows:
wherein the content of the first and second substances,
is the final voltage per unit value of the ith voltage monitoring point.
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| CN103346572A (en) * | 2013-07-29 | 2013-10-09 | 国家电网公司 | Reactive intelligent control method for power grid based on sensitivity and multiple Agents |
| CN104810834A (en) * | 2015-04-14 | 2015-07-29 | 国家电网公司 | Voltage-sensitivity-based multi-section 500 kV grid reactive compensation switching strategy optimizing method |
| CN105048473A (en) * | 2015-08-14 | 2015-11-11 | 国家电网公司 | Low-voltage reactive equipment voltage sensitivity statistics method in automatic voltage control of transformer station |
| CN106655209A (en) * | 2016-10-21 | 2017-05-10 | 国网上海市电力公司 | Data processing method of reactive voltage in urban power grid and data processing system |
| WO2018115431A1 (en) * | 2016-12-23 | 2018-06-28 | Danmarks Tekniske Universitet | Combined active and reactive power control in an operation of a wind farm |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103346572A (en) * | 2013-07-29 | 2013-10-09 | 国家电网公司 | Reactive intelligent control method for power grid based on sensitivity and multiple Agents |
| CN104810834A (en) * | 2015-04-14 | 2015-07-29 | 国家电网公司 | Voltage-sensitivity-based multi-section 500 kV grid reactive compensation switching strategy optimizing method |
| CN105048473A (en) * | 2015-08-14 | 2015-11-11 | 国家电网公司 | Low-voltage reactive equipment voltage sensitivity statistics method in automatic voltage control of transformer station |
| CN106655209A (en) * | 2016-10-21 | 2017-05-10 | 国网上海市电力公司 | Data processing method of reactive voltage in urban power grid and data processing system |
| WO2018115431A1 (en) * | 2016-12-23 | 2018-06-28 | Danmarks Tekniske Universitet | Combined active and reactive power control in an operation of a wind farm |
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