CN105990854B - Direct-current power arrangement method in wind power base delivery system - Google Patents
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Abstract
The invention provides a direct current power arrangement method in a wind power base delivery system, which considers factors such as wind power fluctuation, adjustment capacity and adjustment cost of a direct current delivery and receiving end power grid, demand of the direct current receiving end power grid on direct current transmission power, direct current utilization hours and the like, provides direct current power arrangement considering multiple factors in the wind power base delivery system, and ensures that the given direct current power is practical, feasible and reasonable.
Description
Technical Field
The invention relates to a method in the field of power system automation, in particular to a direct-current power arrangement method considering multiple factors in a wind power base delivery system.
Background
The application and knowledge of electrical energy is first started from direct current. In 1882, a french physicist and an electrician m. dephler sent electric energy generated by a 3-horsepower dc generator installed in a miesbach coal mine to an international museum of munich, which was 57 km away, at a dc voltage of 1500-2000 v, and completed a first power transmission test. In the beginning of the 20 th century, the voltage, power and distance of the experimental dc transmission reached 125 kv, 20 mw and 225 km, respectively. However, because the direct current generators are connected in series to obtain the high-voltage direct current power supply, and the receiving end motor is also operated in a series connection mode, the high-voltage large-capacity direct current motor is difficult to commutate and limited, the series connection operation mode is relatively complex, and the reliability is poor, so that direct current transmission is not further developed in the period of nearly half a century. In the 30-50 s of the 20 th century, people explore that various devices form a converter to be used as a direct-current high-voltage power supply to replace a direct-current generator, so that a controllable mercury arc valve converter is developed, and a road is opened up for developing high-voltage high-power direct-current power transmission. In 1954, a submarine cable direct-current transmission line with the length of 96 kilometers is built between Swedish local and Goldeland, the direct-current voltage is +/-100 kilovolts, the transmission power is 20 megawatts, the submarine cable direct-current transmission line is the first industrial high-voltage direct-current transmission line in the world, and since the DC transmission line is built in the DC transmission project of the Goldeland, the DC transmission line is valued again and grows rapidly by people. The silicon controlled rectifier elements appear in the later period of 50 years, and a new way is opened up for manufacturing the converter equipment. In the 70 s of the 20 th century, with the rapid development of the silicon controlled rectifier technology, the technical advantages of high-voltage direct-current transmission are increasingly obvious. In 30 years, with the progress of power electronic technology, direct current transmission has new development. Nearly 30 direct current transmission projects which are put into operation in the world in the 80 s have total capacity, the total transmission capacity is about 2 gigawatts, and the longest transmission distance exceeds 1 kilokilometer.
The distribution of Chinese energy and load is not even, and the primary energy resource is mainly distributed in southwest, northwest and northern remote areas with low population density, low energy demand and underdeveloped economy. The load is mainly concentrated in the middle east economically developed areas. According to the prediction, the current situation will continue in the future, and the Chinese power flow will still present the overall pattern of large-scale west-east power transmission and north-south power transmission. According to the technical characteristics of direct current transmission, the direct current transmission in the future is positioned in the long-distance and large-capacity delivery of large-scale energy bases in China, and coal power, wind power and transnational power in southwest hydropower bases, northwest, Xinjiang and the like can be transmitted through direct current.
At present, China has built up a direct current project for operation, the power arrangement of the direct current project is generally arranged according to a two-section power curve or a constant power mode, the mode is suitable for a conventional power supply with relatively stable transmission power, when a direct current transmission end power grid contains relatively large-scale wind power, the wind power is generally distributed in a remote area far away from a load center, the absorption capacity of the local power grid is limited, the wind power is generally required to be remotely transmitted to the load center area through direct current, and the transmission end power grid is relatively weak and has limited adjustment capacity, so when the wind power scale is large, the adjustment capacity of the transmission end power grid is often insufficient, the large-scale wind abandon phenomenon can be caused, economic loss is caused, and the absorption of the wind power is not facilitated. The power grid scale of a general load center area is large, the load center area and a wind power transmitting end power grid have certain complementary regulation characteristics, such as season difference, load characteristic difference, power supply structure difference and the like, the existing conventional direct current adopted power arrangement mode is not beneficial to fully utilizing the complementary regulation characteristics of the direct current transmitting end power grid and the receiving end power grid and improving the wind power absorption capacity, and the conventional direct current power arrangement mode in the prior art cannot meet the requirement of power grid development in the future under the condition of large-scale wind power development.
Therefore, a novel method for determining the direct current power considering multiple factors in the wind power base delivery system needs to be provided.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a direct current power arrangement method considering multiple factors in a wind power base delivery system.
The adopted solution for realizing the purpose is as follows:
a multi-factor direct current power arrangement method in a wind power base delivery system is considered, and the method comprises the following steps:
I. determining the power P converted from the number of hours of use of the direct currentDE；
II. Comparing wind power PwAnd the demand P of the DC receiving end power grid on the DC transmission powerr_needIf P isw＜Pr_needDirectly determining the direct current power; otherwise, judging the branch of wind power regulationAllocating a strategy, and determining the direct current power;
III, determining an updated value P 'of the direct current accumulated average transmission power'DA_average；
IV, comparing the updated value P'DA_averageAnd power P converted from DC according to the number of hours of useDEIf P'DA_average＜PDEEntering step V, otherwise entering step VI;
v, after the direct current power is determined according to the following formula (1), updating the direct current accumulated average transmission power, and entering the step VI;
PD＝max(PD_min,min((Psc_up_limit+Pw),PDE,Pr_w_down_limit)) (1)
in the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, PDNFor rated DC power, Pr_w_down_limitThe downward regulation capacity of the direct current receiving end power grid on wind power is achieved;
VI, comparing the direct current power P of the formula (1)DAnd the downward regulation capacity P of the direct current transmission end power grid to wind powers_w_down_limitSum and wind power Pw；
If Pw＜PD+Ps_w_down_limitEntering a step VII, otherwise, entering the step VII after determining the air abandon amount;
VII, determining the adjusting capacity which needs to be provided for the wind power by the direct current transmitting end power grid and the receiving end power grid respectively;
VIII, judging whether the direct current power arrangement is finished or not, if not, updating to the next moment, otherwise, returning to the step II.
Preferably, in the step I, the power converted from the direct current according to the utilization hours is determined according to the following formula (2):
in the formula, PDNFor rated DC power, TDEThe number of hours is economically utilized for direct current.
Preferably, in the step II, the direct current power P is directly determined according to the following formula (3)D：
PD＝max(PD_min,min((Psc_up_limit+Pw),Pr_need,PDN,Pr_w_down_limit))(3)
In the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, Pr_needFor the DC receiving grid's requirement for DC transmission power, PDNFor rated DC power, Pr_w_down_limitThe downward regulation capacity of the direct current receiving end power grid to the wind power is achieved.
Preferably, the distribution strategy for wind power regulation includes: wind power is distributed in proportion according to the regulation capacity of a direct current transmission and receiving end power grid and the regulation cost of the direct current transmission and receiving end power grid.
Preferably, the direct current power is determined according to the following formula (4) by adopting the wind power-based priority direct current transmission strategy:
PD＝max(min(PD_min,Psc_up_limit+Pw),min(Pw,PDN,Pr_w_down_limit)))(4)
in the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, PDNFor rated DC power, Pr_w_down_limitThe downward regulation capacity of the direct current receiving end power grid on wind power is achieved;
preferably, the direct-current power is determined according to the following formula (5) by adopting the direct-current transmission/reception end power grid regulation capacity proportional distribution strategy:
in the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, Ps_w_down_limitFor the downward regulation of the wind power by the direct-current transmission-side grid, Pr_w_down_limitFor the downward regulation capability of the DC receiving end power grid on wind power, PDNIs the rated power of direct current.
Preferably, the direct-current power is determined according to the following formula (6) by adopting the direct-current transmission/reception end power grid regulation cost proportional distribution strategy:
in the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, Cs_w_downCost of regulation of wind power for the grid of the direct current transmission side, Cr_w_downCost of regulation of wind power for a direct current receiving grid, Pr_w_down_limitFor the downward regulation capability of the DC receiving end power grid on wind power, PDNIs the rated power of direct current.
Preferably, the dc accumulated average transmission power is updated as follows:
in the formula, QDAFor cumulative supply of electric energy for DC, TwFor wind power time, PDtIs the DC power at time T, Δ T is the time difference, TDAThe running time is accumulated for dc.
Preferably, in the step VI, the air abandonment amount is determined according to the following formula (8):
Pw_abandoned＝Pw-(PD+Ps_w_down_limit)(8)
in the formula, PDFor direct current power, PwFor wind power, Ps_w_down_limitThe downward regulation capacity of the direct current transmission end power grid to wind power is improved.
Preferably, in step VII, it is determined that the regulation capacity that the dc transmission grid needs to provide for the wind power is as follows (9):
Ps_w_down＝-min(max(Pw-PD,0),Ps_w_down_limit)(9)
determining the regulation capacity required by the receiving-end power grid to provide for the wind power as follows (10):
Pr_w_down＝-PD(10)
in the formula, PDFor direct current power, PwFor wind power, Ps_w_down_limitThe downward regulation capacity of the direct current transmission end power grid to wind power is improved.
Compared with the prior art, the scheme provided by the invention has the following excellent effects:
1. the method provided by the invention can be applied to the actual power system dispatching operation department, and can effectively enlarge the regulation range of wind power fluctuation and improve the wind power absorption capacity through the flexible arrangement of the direct current power.
2. The arrangement of the direct current power in the method provided by the invention considers the factors of direct current utilization hour number limitation, direct current transmitting and receiving end power grid regulation capacity and regulation cost limitation, direct current rated power limitation, direct current minimum transmission power limitation, direct current receiving end power grid power demand limitation and the like, and can ensure that the given direct current power is practical and reasonable.
3. The method provided by the invention makes up the defects of the direct current power arrangement method in the wind power delivery system in the prior art, can be used for reasonably arranging the direct current power in the wind power delivery system, comprehensively considers various factors, and forms the reasonable and feasible direct current power. The method provided by the invention can fully utilize the complementary regulation characteristic and regulation capability of the direct current receiving end power grid, effectively enlarge the wind power consumption range and improve the wind power consumption capability.
4. The method provided by the invention can also be popularized to other intermittent power supply direct current delivery systems such as photovoltaic systems.
Drawings
FIG. 1 is a flow chart of a DC power arrangement method of a wind power base delivery system according to the present invention;
FIG. 2 is a diagram of a wind-powered DC delivery system according to this embodiment;
fig. 3 is a typical daily wind power fluctuation curve, the downward regulation capability of the dc transmission/reception end grid to wind power, and the dc transmission demand curve of the dc reception end grid to dc provided in this embodiment.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The invention provides a direct current power arrangement method considering multiple factors in a wind power base delivery system, the method considers factors such as wind power fluctuation, the adjustment capability and adjustment cost of the direct current transmission and receiving end power grid, the demand of the direct current receiving end power grid on direct current transmission power, the direct current utilization hours and the like, the direct current power arrangement with different time scales can be provided by combining the long-term prediction, the medium-term prediction, the short-term prediction and the ultra-short-term prediction results of the wind power and combining the long-term power generation plan, the medium-term power generation plan, the short-term power generation plan and the ultra-short-term power generation plan of the power grid, the defects of the conventional direct current power arrangement at present are overcome, the direct current power is flexibly given, the adjustment resources and the complementary adjustment characteristics of the power grid of the transmitting and receiving end are fully utilized, the power grid of the direct current transmitting and receiving end participates in the adjustment of the wind power fluctuation at the same time, the wind power absorption range.
As shown in fig. 1, fig. 1 is a flow chart of a direct current power arrangement method of a wind power base delivery system, and the direct current power arrangement method considering multiple factors in the wind power base delivery system provided by the invention includes the following steps:
step one, obtaining relevant parameters, comprising: (1) rated DC power PDN；
(2) DC minimum transmission power PD_min；
(3) Accumulated dc running time TDA；
(4) Direct current accumulated transmission electric quantity QDA；
(5) Number of hours of DC utilization TDE；
(6) Wind power curve (T)w，Pw)；
(7) Demand curve (T) of DC receiving end power grid to DC transmission power within wind power curve time rangew，Pr_need)；
(8) Downward regulation capacity curve (T) of DC transmission end power grid to wind power in wind power curve time rangew，Ps_w_down_limit)；
(9) Downward regulation capacity curve (T) of direct current receiving end power grid to wind power in wind power curve time rangew，Pr_w_down_limit)；
(10) Adjusting cost C of direct current sending end power grid to wind power in wind power curve time ranges_w_down；
(11) Adjusting cost C of direct current receiving end power grid to wind power in wind power curve time ranger_w_down；
(12) Upward power transmission capacity curve (T) of conventional power supply of direct-current transmission end power grid in wind power curve time rangew，Psc_up_limit)。
Step two, according to the number of hours of DC utilization, determining the power P converted from the number of hours of DC utilization according to the following formulaDE：
In the formula, PDNFor rated DC power, TDEThe number of dc utilization hours.
The number of direct current utilization hours refers to the ratio of the direct current annual transmission electric quantity to the direct current rated power. It should be noted that, if there is a requirement for the number of utilization hours in the dc operation, there is a constraint, otherwise, the constraint may be removed, that is, the number of utilization hours is set to be less than or equal to 0.
Step three, comparing the wind power PwAnd the demand P of the DC receiving end power grid on the DC transmission powerr_needIf P isw＜Pr_needDirectly determining the direct current power as the sum of the upward transmission capacity and the wind power of the conventional power supply of the transmitting end power grid, the power demand of the receiving end power grid, the direct current rated power and the downward transmission capacity of the receiving end power gridAdjusting the minimum value of the four variables of the capacity, wherein the minimum value is not less than the DC minimum transmission power;
if Pw≥Pr_needAnd judging the distribution strategy of wind power regulation and determining the direct current power.
Step four, determining an updated value P 'of the direct current accumulated average transmission power according to the following formula'DA_average：
In the formula, QDAFor cumulative supply of electric energy for DC, TwFor wind power time, PDtIs the DC power at time T, Δ T is the time difference, TDAThe running time is accumulated for dc.
Step five, comparing the update value P'DA_averageAnd power P converted from DC according to the number of hours of useDE；
If P'DA_average＜PDEEntering the step six;
if PDE＜P′DA_averageStep seven is entered.
Step six, firstly, determining the direct current power as the minimum value of the sum of the upward transmission capacity and the wind power of the conventional power supply of the direct current transmitting end power grid, the power converted by direct current according to the utilization hours and the downward regulation capacity of the direct current receiving end power grid, wherein the direct current power is not less than the direct current minimum transmission power; then, the direct current accumulated average transmission power is updated again, and an updated value P 'of the direct current accumulated average transmission power is determined'DA_average. That is, the dc power is determined as follows:
PD＝max(PD_min,min((Psc_up_limit+Pw),PDE,Pr_w_down_limit))
in the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, PDNFor rated DC power, Pr_w_down_limitDirection of wind power for DC receiving end electric networkA lower regulation capacity;
the dc accumulated average delivered power is then updated again. Updating the dc accumulated average transmit power as follows:
in the formula, QDAFor cumulative supply of electric energy for DC, TwFor wind power time, PDtDC power at time t, i.e. P at time tD＝max(PD_min,min((Psc_up_limit+Pw),PDE,Pr_w_down_limit) Δ T is the time difference, TDAThe running time is accumulated for dc.
Step seven, comparing the direct current power P determined after the step four, the step five and the step six are completedDAnd the downward regulation capacity P of the direct current transmission end power grid to wind powers_w_down_limitSum and wind power Pw。
If Pw＜PD+Ps_w_down_limitIf not, determining the air abandoning amount according to the following formula and then entering the eighth step;
Pw_abandoned＝Pw-(PD+Ps_w_down_limit)
in the formula, PDFor direct current power, PwFor wind power, Ps_w_down_limitThe downward regulation capacity of the direct current transmission end power grid to wind power is improved.
Step eight, determining the regulating capacity which needs to be provided for the wind power by the direct current transmitting end power grid and the receiving end power grid respectively; the method comprises the following steps:
determining the regulation capacity required by the direct current transmission end power grid to provide for the wind power as follows:
Ps_w_down＝-min(max(Pw-PD,0),Ps_w_down_limit)
determining the regulation capacity required by the receiving-end power grid to provide for the wind power as follows:
Pr_w_down＝-PD
in the formula, PDIs direct current power，PwFor wind power, Ps_w_down_limitThe downward regulation capacity of the direct current transmission end power grid to wind power is improved.
Step nine, judging whether the direct current power arrangement is finished, if not, updating to the next moment, otherwise, returning to the step two.
Further to step three, the dc power is determined according to the following formula:
PD＝max(PD_min,min((Psc_up_limit+Pw),Pr_need,PDN,Pr_w_down_limit))
in the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, Pr_needFor the DC receiving grid's requirement for DC transmission power, PDNFor rated DC power, Pr_w_down_limitThe downward regulation capacity of the direct current receiving end power grid to the wind power is achieved.
The distribution strategy for adjusting the wind power in the third step comprises the following steps: wind power is distributed in proportion according to the regulation capacity of a direct current transmission and receiving end power grid and the regulation cost of the direct current transmission and receiving end power grid.
1. And if the direct current transmission strategy is adopted, the direct current power is determined to be the minimum value of the wind power, the direct current rated power and the downward regulation capacity of the direct current receiving end power grid, and is not less than the sum of the direct current minimum transmission power or the upward transmission capacity of the conventional power supply of the direct current transmitting end power grid and the wind power.
That is, the dc power is determined as follows:
PD＝max(min(PD_min,Psc_up_limit+Pw),min(Pw,PDN,Pr_w_down_limit)))
in the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, PDNFor rated DC power, Pr_w_down_limitDirection of wind power for DC receiving end electric networkA lower regulation capacity;
2. and if the strategy of proportional distribution according to the regulation capacity of the direct-current transmitting and receiving end power grid is adopted, determining that the direct-current power is the minimum value of the wind power proportional distribution value according to the regulation capacity of the transmitting and receiving end power grid, the direct-current rated power and the downward regulation capacity of the direct-current receiving end power grid, and is not less than the sum of the direct-current minimum transmission power or the upward transmission capacity of the conventional power supply of the direct-current transmitting end power grid and the wind power.
That is, the dc power is determined as follows:
in the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, Ps_w_down_limitFor the downward regulation of the wind power by the direct-current transmission-side grid, Pr_w_down_limitFor the downward regulation capability of the DC receiving end power grid on wind power, PDNIs the rated power of direct current.
3. And if the strategy of proportional distribution according to the adjustment cost of the direct-current transmitting and receiving end power grid is adopted, determining that the direct-current power is the minimum value of the wind power proportional distribution value according to the adjustment cost of the transmitting and receiving end power grid, the direct-current rated power and the downward adjustment capacity of the direct-current receiving end power grid, and is not less than the sum of the direct-current minimum transmission power or the upward transmission capacity of the conventional power supply of the direct-current transmitting end power grid and the wind power.
That is, the dc power is determined as follows:
in the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, Cs_w_downCost of regulation of wind power for the grid of the direct current transmission side, Cr_w_downCost of regulation of wind power for a direct current receiving grid, Pr_w_down_limitIs a direct current receiverDownward regulation capability of end grid to wind power, PDNIs the rated power of direct current.
The method for determining the direct current power comprises the steps of determining the direct current power according to the direct current transmission strategy, the direct current transmission and receiving end power grid regulation capacity proportional distribution strategy and the direct current transmission and receiving end power grid regulation cost proportional distribution strategy.
Step one, obtaining relevant parameters, comprising: (1) rated DC power PDN＝8000MW。
(2) DC minimum transmission power PD_min＝800MW。
(3) Accumulated dc running time TDA＝0。
(4) Direct current accumulated transmission electric quantity QDA＝0。
(5) Number of hours of DC utilization TDE5500 hours.
(6) Wind power curve (T)w，Pw) As shown in fig. 3 and table 1.
(7) The demand of the dc receiving end power grid for the dc transmission power within the time range of the wind power curve is shown in fig. 3 and table 1.
(8) The downward regulation capability of the direct current transmission end power grid to wind power in the time range of the wind power curve is shown in fig. 3 and table 1.
(9) The downward regulation capability of the direct current receiving end power grid to wind power in the time range of the wind power curve is shown in fig. 3 and table 1.
(10) Adjusting cost C of direct current sending end power grid to wind power in wind power curve time ranges_w_down0.3 yuan/kw.h.
(11) Adjusting cost C of direct current receiving end power grid to wind power in wind power curve time ranger_w_down0.4 yuan/kw.h.
(12) The conventional power supply of the direct current transmission end power grid transmits power upwards within the time range of the wind power curve, as shown in fig. 3 and table 1.
Step two: calculating the power converted from the number of available hours of DC
Step three: wind power P at time 0w2667MW, DC receiving end network DC transmission power Pr_need1600MW, comparison PwAnd Pr_need，Pw>Pr_need。
Then, three strategy situations of preferentially passing through a direct current transmission strategy according to wind power, proportionally distributing according to the regulation capacity of a direct current transmission and receiving end power grid and proportionally distributing according to the regulation cost of the direct current transmission and receiving end power grid are respectively explained.
Under the first condition, according to the direct current transmission strategy of wind power priority, the method of the invention comprises the following steps:
step four: the investigation distribution strategy is a direct current transmission strategy for wind power to pass through preferentially, and the direct current power is calculated
PD＝max(min(PD_min,Psc_up_limit+Pw),min(Pw,PDN,Pr_w_down_limit))＝max(min(800,8000+2667),min(2667,8000,8000))MW＝2667MW
Step five: calculating an updated value of the direct current accumulated average transmission power:
step six: and judging that the DC accumulated average transmission power update value is smaller than the power converted by the DC according to the utilization hours.
Calculating the direct current power:
PD＝max(PD_min,min((Psc_up_limit+Pw),PDE,Pr_w_down_limit))＝max(800,min((8000+2667),5022,8000))MW＝5022MW
then, the DC accumulated average transmission power is renewed
Step seven: judgment of PD+Ps_w_down_limit＝(5022+6000)MW＞Pw2667MW, no wind dump is required.
Step eight: the regulation capacities required by the direct current transmission and receiving end power grid to provide for the wind power are respectively obtained as
Ps_w_down＝-min(max(Pw-PD,0),Ps_w_down_limit)＝-min(max(2667-5022,0),6000)MW＝0MW
Pr_w_down＝-PD＝-5022MW
Step nine: judging whether the direct current power arrangement is finished or not, if not, updating to the next moment, and repeating the steps from two to nine; until the dc power schedule is completed.
And secondly, according to the strategy of proportional distribution of the regulating capacity of the direct current transmission and receiving end power grid, the method of the invention comprises the following steps:
step four: the investigation distribution strategy is a direct current power calculation distribution strategy in proportion to the regulation capacity of the direct current transmission and receiving end power grid
Step five: calculating an updated value of the direct current accumulated average transmission power:
step six: and judging that the DC accumulated average transmission power update value is smaller than the power converted by the DC according to the utilization hours.
Calculating direct current power:
PD＝max(PD_min,min((Psc_up_limit+Pw),PDE,Pr_w_down_limit))＝max(800,min((8000+1524),5022,8000))MW＝5022MW
then, the DC accumulated average transmission power is renewed
Step seven: judgment, PD+Ps_w_down_limit＝(5022+6000)MW＞Pw2667MW, no wind dump is required.
Step eight: the regulation capacities required by the direct current transmission and receiving end power grid to provide for the wind power are respectively obtained as
Ps_w_down＝-min(max(Pw-PD,0),Ps_w_down_limit)＝-min(max(2667-5022,0),6000)MW＝0MW
Pr_w_down＝-PD＝-5022MW
Step nine: judging whether the direct current power arrangement is finished or not, if not, updating to the next moment, and repeating the steps from two to nine; until the dc power schedule is completed.
And thirdly, according to a strategy of proportional distribution of the adjustment cost of the direct current transmission and receiving end power grid, by adopting the method disclosed by the invention, the following steps are as follows:
step four: the investigation distribution strategy is a proportional distribution strategy according to the adjustment cost of the direct current transmission and receiving end power grid, and the direct current power is calculated as follows:
step five: calculating an updated value of the direct current accumulated average transmission power:
step six: and (3) judging: the DC cumulative average transmission power update value is smaller than the power converted by the DC according to the utilization hours.
Calculating DC power
Then, the DC accumulated average transmission power is renewed
Step seven: judgment, PD+Ps_w_down_limit＝(5022+6000)MW＞Pw2667MW, no wind dump is required.
Step eight: the regulation capacities required by the direct current transmission and receiving end power grid to provide for the wind power are respectively obtained as
Ps_w_down＝-min(max(Pw-PD,0),Ps_w_down_limit)＝-min(max(2667-5022,0),6000)MW＝0MW
Pr_w_down＝-PD＝-5022MW
Step nine: judging whether the direct current power arrangement is finished or not, if not, updating to the next moment, and repeating the steps from two to nine; until the dc power schedule is completed.
Table 1 shows typical daily wind power fluctuation, downward wind power regulation capacity of a direct current transmission and receiving end power grid and direct current power transmission demand data table of the direct current receiving end power grid
It should be noted that the above-mentioned embodiments are only used for illustrating the technical solutions of the present application and not for limiting the protection scope thereof, and although the present application is described in detail with reference to the above-mentioned embodiments, those skilled in the art can still make various changes, modifications or equivalents to the specific embodiments of the application after reading the present application, but these changes, modifications or equivalents are within the protection scope of the claims of the application pending.
Claims (10)
1. A direct current power arrangement method in a wind power base delivery system is characterized in that: the method comprises the following steps:
I. determining the power P converted from the number of hours of use of the direct currentDE；
II. Comparing wind power PwAnd a DC receiving end power gridDemand for DC power delivery Pr_needIf P isw＜Pr_needDirectly determining the direct current power; otherwise, judging a distribution strategy of wind power regulation and determining the direct current power;
III, determining an updated value P 'of the direct current accumulated average transmission power'DA_average；
IV, comparing the updated value P'DA_averageAnd power P converted from DC according to the number of hours of useDEIf P'DA_average<PDEEntering step V, otherwise entering step VI;
v, after the direct current power is determined according to the following formula (1), updating the direct current accumulated average transmission power again, and entering the step VI;
PD＝max(PD_min,min((Psc_up_limit+Pw),PDE,Pr_w_down_limit)) (1)
in the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, PDNFor rated DC power, Pr_w_down_limitThe downward regulation capacity of the direct current receiving end power grid on wind power is achieved;
VI, comparing the direct current power P of the formula (1)DAnd the downward regulation capacity P of the direct current transmission end power grid to wind powers_w_down_limitSum and wind power Pw；
If Pw＜PD+Ps_w_down_limitEntering a step VII, otherwise, entering the step VII after determining the air abandon amount;
VII, determining the adjusting capacity which needs to be provided for the wind power by the direct current transmitting end power grid and the receiving end power grid respectively;
VIII, judging whether the direct current power arrangement is finished or not, if not, updating to the next moment, returning to the step II, and finishing after finishing.
2. The method of claim 1, wherein: in the step I, the power converted from the direct current per-use hours is determined according to the following formula (2):
in the formula, PDNFor rated DC power, TDEThe number of dc utilization hours.
3. The method of claim 1, wherein: in the step II, the direct current power P is directly determined according to the following formula (3)D：
PD＝max(PD_min,min((Psc_up_limit+Pw),Pr_need,PDN,Pr_w_down_limit)) (3)
In the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, Pr_needFor the DC receiving grid's requirement for DC transmission power, PDNFor rated DC power, Pr_w_down_limitThe downward regulation capacity of the direct current receiving end power grid to the wind power is achieved.
4. The method of claim 1, wherein: the distribution strategy for wind power regulation comprises the following steps: and the wind power is distributed in proportion according to the regulation capability of the direct current transmission and receiving end power grid and the regulation cost of the direct current transmission and receiving end power grid by a direct current transmission strategy preferentially.
5. The method of claim 4, wherein: and determining the direct current power according to the following formula (4) by adopting the direct current transmission strategy according to the priority of wind power:
PD＝max(min(PD_min,Psc_up_limit+Pw),min(Pw,PDN,Pr_w_down_limit))) (4)
in the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, PDNFor rated DC power, Pr_w_down_limitThe downward regulation capacity of the direct current receiving end power grid to the wind power is achieved.
6. The method of claim 4, wherein: and determining the direct current power according to the following formula (5) by adopting the direct current transmission and receiving end power grid regulation capacity proportional distribution strategy:
in the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, Ps_w_down_limitFor the downward regulation of the wind power by the direct-current transmission-side grid, Pr_w_down_limitFor the downward regulation capability of the DC receiving end power grid on wind power, PDNIs the rated power of direct current.
7. The method of claim 4, wherein: and determining the direct current power according to the following formula (6) by adopting the direct current transmission and receiving end power grid regulation cost proportional distribution strategy:
in the formula, PD_minFor minimum DC power transmission, Psc_up_limitFor the upward delivery capacity of the conventional power supply of the transmission-side grid, PwFor wind power, Cs_w_downCost of regulation of wind power for the grid of the direct current transmission side, Cr_w_downCost of regulation of wind power for a direct current receiving grid, Pr_w_down_limitFor the downward regulation capability of the DC receiving end power grid on wind power, PDNIs the rated power of direct current.
8. The method of claim 1, wherein: updating the dc accumulated average transmit power as follows (7):
in the formula, QDAFor cumulative supply of electric energy for DC, TwFor wind power time, PDtIs the DC power at time T, Δ T is the time difference, TDAThe running time is accumulated for dc.
9. The method of claim 1, wherein: in the step VI, determining the air abandon amount as follows:
Pw_abandoned＝Pw-(PD+Ps_w_down_limit) (8)
in the formula, PDFor direct current power, PwFor wind power, Ps_w_down_limitThe downward regulation capacity of the direct current transmission end power grid to wind power is improved.
10. The method of claim 1, wherein: in the step VII, the regulation capacity which needs to be provided for the wind power by the direct current transmission end power grid is determined as follows:
Ps_w_down＝-min(max(Pw-PD,0),Ps_w_down_limit) (9)
determining the regulation capacity required by the receiving-end power grid to provide for the wind power as follows (10):
Pr_w_down＝-PD(10)
in the formula, PDFor direct current power, PwFor wind power, Ps_w_down_limitThe downward regulation capacity of the direct current transmission end power grid to wind power is improved.
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| JP2000333373A (en) * | 1999-05-20 | 2000-11-30 | Toshiba Corp | Distribution power supply system |
| JP2012075224A (en) * | 2010-09-28 | 2012-04-12 | Shikoku Res Inst Inc | Power storage system for renewable energy |
| CN102064562A (en) * | 2010-11-05 | 2011-05-18 | 甘肃省电力公司 | Active power optimization method for combined transmission of wind power and thermal power |
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