CN102904287B - Coordination control method for flexible alternate current transmission system (FACTS) devices of new energy delivery system - Google Patents

Abstract

The invention provides a FACTS equipment coordination control method for a new energy external delivery system, which is divided into inner layer control, outer layer control and outermost layer control, wherein the outermost layer control has a higher priority than the outer layer control, and the outer layer control has priority The level is higher than the internal control. The inner layer control ensures that the voltage of the substation can be accurately controlled within a certain value or within a certain range. The outer layer control and the outermost layer control provide emergency reactive power support when there is a large disturbance in the system, ensuring that the voltage of the substation can quickly return to the allowable range. The method of combining three-layer voltage control can centrally coordinate and control the actions of multiple FACTS devices with high precision and high efficiency, and has strong engineering adaptability.

Description

A FACTS equipment coordination control method for a new energy delivery system

technical field

The invention belongs to the technical field of power systems, and in particular relates to a FACTS equipment coordination control method of a new energy delivery system.

Background technique

With the completion of the second channel of the main network between Xinjiang and Northwest China, a 750 kV double-ring network with a total length of nearly 3,000 kilometers will be formed from the first channel - the second channel - Hercynian channel. There are two large-scale wind power bases of 10 million kilowatts in Jiuquan and Hami and a photovoltaic base in Haixi on the channel. The development of new energy in these areas is characterized by large-scale, high concentration, and long-distance, and develops rapidly. With the large-scale feed-in of new energy, large-scale and high-frequency fluctuations in wind power have caused frequent power flow fluctuations on the two channels connecting Xinjiang and Northwest China, making it difficult to control reactive power and voltage. Conventional low-voltage reactive power compensation equipment cannot meet the requirements of frequent switching, and dynamic reactive power compensation equipment is required. According to the planning and demonstration, the second channel of the Xinjiang and Northwest interconnection is planned to install multiple sets of capacity new FACTS devices. Among them, the Shazhou-Yuka two-circuit line is equipped with a total of 4 sets of line graded controllable reactors, each with a capacity of 390Mvar, a fixed capacity of 39Mvar, an adjustable capacity of 351Mvar, three-stage adjustable, and a single-stage capacity of 117Mvar; Shazhou station transformer The third winding side is equipped with a static var compensator SVC (360Mvar capacitive, 360Mvar inductive); the busbar of the fish card station is equipped with a 330Mvar magnetic valve busbar with controllable high reactance, a fixed capacity of 16.5Mvar, and is continuously adjustable.

At present, the independent control strategy of 750kV controllable reactor and SVC has been studied in China, but the coordinated control strategy among multiple FACTS equipment is still blank in China. China's 750kV Dunhuang Substation Controllable High Resistance Demonstration Project is the world's first controllable high resistance project applied to the centralized transmission system of 750kV wind power. The project was successfully put into operation on January 5, 2012. For the Dunhuang 750kV controllable reactor, the System Institute of China Electric Power Research Institute proposed a double-layer control strategy for the controllable reactor based on the reactive power demand increment and the bus boundary voltage. It has obvious effects in reducing the reactive power loss of the line, realizing the dynamic support of the bus voltage in the transient process, reducing the number of actions of the low-voltage reactive power compensation device in the station, and reducing the operating pressure in the station. Static var compensator SVC, as an effective means of reactive power compensation and voltage fluctuation suppression, has been widely used in medium and high voltage power grids and ultra-high voltage power grids, and has accumulated many years of operating experience. SVC is mainly used to provide emergency reactive power compensation for the grid in the post-fault transient process to enhance the grid voltage support to improve the safety and stability of the grid, and to provide continuous reactive power regulation during normal operation to suppress voltage fluctuations. SVC generally adopts a voltage-based control strategy. Through continuous adjustment, the voltage of the bus where the SVC is located can be maintained constant.

A total of 5 sets of 750kV controllable high-resistance and 1 set of 66kV SVC were installed in the second channel of Xinjiang and the Northwest main network. Realizing the coordinated optimal control between the controllable high reactance groups and the coordinated optimal control between the controllable high reactance and SVC is very critical to effectively suppress the frequent fluctuation of reactive power and voltage of the two-channel transmission system caused by the fluctuation of new energy.

Contents of the invention

In order to overcome the shortcomings of the above-mentioned prior art, the present invention provides a FACTS equipment coordination control method for a new energy external delivery system, which is divided into inner layer control, outer layer control and outermost layer control, wherein the outermost layer control has a higher priority For outer control, the priority of outer control is higher than that of inner control. The inner layer control ensures that the voltage of the substation can be accurately controlled within a certain value or within a certain range. The outer layer control and the outermost layer control provide emergency reactive power support when there is a large disturbance in the system, ensuring that the voltage of the substation can quickly return to the allowable range. The method of combining three-layer voltage control can centrally coordinate and control the actions of multiple FACTS devices with high precision and high efficiency, and has strong engineering adaptability.

In order to realize the above-mentioned purpose of the invention, the present invention takes the following technical solutions:

The invention provides a FACTS equipment coordination control method of a new energy external delivery system, the method includes inner layer control, outer layer control and outermost layer control; the inner layer control accurately controls the voltage of the substation to the voltage target value or voltage In the control zone; when there is a large disturbance in the new energy external transmission system, the outer control and the outermost control provide emergency reactive power support, so that the voltage of the substation can be quickly restored to the allowable range.

The new energy delivery system is the second channel of Xinjiang and Northwest main grid network, wind power and solar energy are sent out through the network channel, and FACTS equipment is installed on the network channel; among them, the main transformer of Shazhou station along the network channel is the third A 66kV static var compensator is installed on the winding side, a magnetically controlled busbar controllable high reactance is installed on the busbar side of the Yuka switch station, and a graded controllable high reactance is installed on both sides of the double-circuit line of the Shazhou-Yuka line.

In the inner layer control, the inner layer voltage control is cycled every 1 minute; the inner layer control of Shazhou station and Yuka station is set with a time delay of 30s to avoid the simultaneous action of hierarchical controllable high resistance lines at Shazhou station and Yuka station .

The inner layer voltage control uses the bus voltage of the substation as the input quantity, and inputs the control voltage target value V ₁ of the Shazhou station, the control voltage target value V ₂ of the Yuka station, and the Shazhou bus voltage control zone [V ₁ -ΔV ₁ , V ₁ +ΔV ₁ ] and Yuka bus voltage control belt [V ₂ -ΔV ₂ , V ₂ +ΔV ₂ ], ΔV ₁ and ΔV ₂ are the bus voltage deviation allowed by Shazhou station and Yuka station respectively, V ₁ and V ₂ , ΔV ₁ and ΔV ₂ are determined by the user.

When the inner layer voltage is controlled, give priority to the follow-up regulation of the Shazhou static var compensator and the Yuka magnetically controlled high-resistance, and control the Shazhou station voltage and the Yuka station voltage at V ₁ and V ₂ respectively; When the static var compensator and magnetically controlled high-resistance have reached the maximum/minimum capacity, and the Shazhou/Yuka bus voltage is still not within the voltage control band, the line controllable high-resistance in the station will trigger action at this time; in order to reduce equipment Loss, when the controllable high-resistance control is triggered, the controllable high-resistance I and II of the Shazhou station line alternately act, and the controllable high-resistance I and II of the Yuka station line alternately operate, one level at a time;

When the controllable high resistance I of a group of lines in the station has moved to the first level, if the monitored bus voltage is still not within the allowable voltage control band, a trigger command will be sent to another group of lines in the station. The first level of action, if the controllable high resistance II is faulty or has reached the maximum/minimum capacity at this time, then send a trigger command to the controllable high resistance I, and the controllable high resistance I will act again;

When the controllable high-resistance I of a group of lines in the station needs to act, but because the controllable high-resistance I itself fails or has reached the maximum/minimum capacity, a trigger command is sent to another group of line controllable high-resistance II in the station, and the controllable high Anti-II action level, after the controllable high anti-II action level, if the monitored bus voltage is still not within the allowable voltage control band, the controllable high anti-II needs to act one level again.

The outer layer control takes the bus voltage of the substation as the input quantity, and inputs the upper boundary U ₁ of the outer layer voltage and the lower boundary U ₂ of the outer layer voltage, and the upper boundary U ₁ of the outer layer voltage and the lower boundary U ₂ of the outer layer voltage are determined by the user; Layer control monitors the voltage in real time. When there is a large disturbance in the new energy delivery system and the bus voltage is detected to be outside [U ₂ , U ₁ ] for 5 seconds in a row, the two sets of lines in the station have controllable high-resistance I and controllable high-resistance II At the same time, the first-level capacity is removed or put in. At this time, the static var compensator and the magnetically controlled high-resistance have been dynamically adjusted within the monitoring time of 5s to reach their maximum/minimum capacity. After the line controllable high-resistance action is completed , and then start the next cycle timing;

When a fault occurs in the area, that is, the Shazhou-Yuka line is faulty, the electromagnetic transient control is given priority; if within 5s monitoring time, the coordination controller in the station and the line controllable high resistance receive the Shazhou-Yuka line to continue If the electric protection exit signal or the circuit breaker position contact signal, the outer layer control is blocked, the electromagnetic transient control strategy is started, the controllable high resistance of the lines on both sides is switched to the maximum capacity, and after the electromagnetic transient control is completed, it is switched back to the outer layer control .

The outermost layer voltage control uses the substation bus voltage as the input quantity, and inputs the outermost layer voltage control upper limit U', and the value of U' is determined by the user; the outermost layer voltage control monitors the system voltage in real time, and once the voltage is detected to be higher than U ', the two groups of lines in the station have graded controllable high resistance and immediately act to the maximum capacity to suppress the high voltage of the system.

The outermost control has a higher priority than the outer control, and the outer control has a higher priority than the inner control.

Compared with prior art, the beneficial effect of the present invention is:

1. The method of the present invention directly takes voltage as the control target, has clear physical meaning, and is simple and intuitive.

2. The present invention effectively coordinates the continuous voltage regulation FACTS equipment (including static var compensator and magnetically controlled busbar controllable high reactance) with the step-by-step line controllable high reactance. When the wind power fluctuation causes the system voltage to change, the continuous voltage regulation device will act first, and exert its follow-up voltage regulation function to accurately control the voltage at the target value. When the continuous voltage regulation equipment has been adjusted to the maximum/minimum capacity and the voltage of the substation is still beyond the control range, the graded line can control the high resistance to operate again at this time to control the voltage within a reasonable range. The control method gives full play to the continuous follow-up voltage regulation function of SVC and magnetically controlled busbar controllable high reactance, avoids the frequent action of graded controllable high reactance, and significantly improves the action accuracy and utilization efficiency of each FACTS equipment.

3. The present invention adopts three layers of voltage control, the outermost layer control is prior to the outer layer control, the outer layer control is prior to the inner layer control, and the hierarchical controllable high resistance adopts different action principles in different control layers. In the inner layer control, one group of hierarchical controllable high resistances in the substation is allowed to act one level each time; in the outer layer control, two groups of hierarchical controllable high resistances in the substation are allowed to act one level at the same time; , allowing two groups of graded controllable high resistances in the substation to operate simultaneously to the maximum capacity each time. Adopting different hierarchical controllable high-resistance action principles can not only reduce the action frequency of controllable high-resistance and the impact on the system during inner control, but also provide emergency safety for the system during outer control and outermost control. power support. The method of combining three layers of control makes the operation rationality of the controllable high resistance significantly improved, which provides a guarantee for the controllable high resistance to play a role in the large-scale new energy transmission system, and has broad application prospects.

Description of drawings

Figure 1 is a schematic diagram of the FACTS equipment coordination control method of the new energy delivery system;

Fig. 2 is a schematic diagram of the outer layer control strategy of Shazhou station in the embodiment of the present invention;

Fig. 3 is a schematic diagram of the outer layer control strategy of the fish card station in the embodiment of the present invention;

Fig. 4 is a schematic diagram of the outermost layer control strategy of Shazhou station in the embodiment of the present invention;

Fig. 5 is a schematic diagram of the outermost control strategy of the fish card station in the embodiment of the present invention;

Fig. 6 is a schematic diagram of the second channel of Xinjiang and Northwest main network networking in the embodiment of the present invention;

Fig. 7 is a controllable high-resistance action diagram of the Shazhou side line when the wind power fluctuates evenly under the summer mode in 2013 in the embodiment of the present invention;

Fig. 8 is an action diagram of the controllable high resistance of the line on the side of the fish card when the wind power fluctuates uniformly in the summer mode in 2013 in the embodiment of the present invention;

Fig. 9 is an action diagram of SVC in Shazhou when the wind power fluctuates uniformly in the summer mode in 2013 in the embodiment of the present invention;

Fig. 10 is an action diagram of the controllable high resistance of the fish-card bus when the wind power fluctuates uniformly in the summer mode in 2013 in the embodiment of the present invention;

Figure 11 is a diagram of the voltage change (kV) at the 750kV side of the Shazhou station and the Yuka station when the wind power fluctuates uniformly in the summer mode in 2013 in the embodiment of the present invention;

Fig. 12 is a diagram of the voltage change (kV) of the Shazhou station after the N-2 fault of the Dunhuang-Jiuquan line under the Xiada basic mode in 2013 in the embodiment of the present invention;

Fig. 13 is a diagram of the voltage change (kV) of the fish card station after the N-2 failure of the Dunhuang-Jiuquan line under the basic mode of Xiada in 2013 in the embodiment of the present invention;

Fig. 14 is a diagram of the voltage change (kV) of the Shazhou station after the Gansu wind power off-grid in the winter of 2013 under the extreme limit mode in the embodiment of the present invention;

Fig. 15 is a diagram of the voltage change (kV) of the Yuka station after the Gansu wind power off-grid in the extreme winter mode of 2013 in the embodiment of the present invention.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, the present invention provides a FACTS equipment coordination control method for a new energy external transmission system, the method includes inner layer control, outer layer control and outermost layer control; the inner layer control accurately controls the voltage of the substation at the voltage Within the target value or voltage control band; when there is a large disturbance in the new energy external transmission system, the outer control and the outermost control provide emergency reactive power support, so that the voltage of the substation can quickly return to the allowable range.

In the inner layer control, the inner layer voltage control is cycled every 1 minute; the inner layer control of Shazhou station and Yuka station is set with a time delay of 30s to avoid the simultaneous action of hierarchical controllable high resistance lines at Shazhou station and Yuka station .

The inner layer voltage control uses the bus voltage of the substation as the input quantity, and inputs the control voltage target value V ₁ of the Shazhou station, the control voltage target value V ₂ of the Yuka station, and the Shazhou bus voltage control zone [V ₁ -ΔV ₁ , V ₁ +ΔV ₁ ] and Yuka bus voltage control belt [V ₂ -ΔV ₂ , V ₂ +ΔV ₂ ], ΔV ₁ and ΔV ₂ are the bus voltage deviation allowed by Shazhou station and Yuka station respectively, V ₁ and V ₂ , ΔV ₁ and ΔV ₂ are determined by the user.

When the inner layer voltage is controlled, give priority to the follow-up regulation of the Shazhou static var compensator and the Yuka magnetically controlled high-resistance, and control the Shazhou station voltage and the Yuka station voltage at V ₁ and V ₂ respectively; When the static var compensator and magnetically controlled high-resistance have reached the maximum/minimum capacity, and the Shazhou/Yuka bus voltage is still not within the voltage control band, the line controllable high-resistance in the station will trigger action at this time; in order to reduce equipment Loss, when the controllable high-resistance control is triggered, the controllable high-resistance I and II of the Shazhou station line alternately act, and the controllable high-resistance I and II of the Yuka station line alternately operate, one level at a time;

When the controllable high resistance I of a group of lines in the station has moved to the first level, if the monitored bus voltage is still not within the allowable voltage control band, a trigger command will be sent to another group of lines in the station. The first level of action, if the controllable high resistance II is faulty or has reached the maximum/minimum capacity at this time, then send a trigger command to the controllable high resistance I, and the controllable high resistance I will act again;

When the controllable high-resistance I of a group of lines in the station needs to act, but because the controllable high-resistance I itself fails or has reached the maximum/minimum capacity, a trigger command is sent to another group of line controllable high-resistance II in the station, and the controllable high Anti-II action level, after the controllable high anti-II action level, if the monitored bus voltage is still not within the allowable voltage control band, the controllable high anti-II needs to act one level again.

As shown in Fig. 2 and Fig. 3, the outer layer control takes the bus voltage of the substation as the input quantity, input the upper boundary of the outer layer voltage U ₁ and the lower boundary of the outer layer voltage U ₂ , the upper boundary of the outer layer voltage U ₁ and the lower boundary of the outer layer voltage U ₂ is determined by the user; the outer control monitors the voltage in real time. When there is a large disturbance in the new energy delivery system, the bus voltage is detected to be outside [U ₂ , U ₁ ] for 5 consecutive seconds, and the two sets of lines in the station can control the high I and controllable high-resistance II are cut off or put into primary capacity at the same time. At this time, the static var compensator and the magnetically controlled high-resistance have been dynamically adjusted within the monitoring time of 5s to reach their maximum/minimum capacity. After the controllable high resistance action is completed, start the next cycle timing;

When a fault occurs in the area, that is, the Shazhou-Yuka line fault, the electromagnetic transient control is given priority; if within 5s monitoring time, the coordination controller in the station and the line controllable high-resistance receive the signal received from Shazhou-Yuka If the line relay protects the exit signal or the circuit breaker position contact signal, the outer layer control is blocked, the electromagnetic transient control strategy is started, and the controllable high resistance of the lines on both sides is switched to the maximum capacity. After the electromagnetic transient control is completed, it is switched back to the outer layer layer control.

As shown in Fig. 4 and Fig. 5, the outermost layer voltage control takes the substation bus voltage as the input quantity, and inputs the outermost layer voltage control upper limit U', and the value of U' is determined by the user; the outermost layer voltage control monitors the system voltage in real time, Once it is detected that the voltage is higher than U', the two groups of lines in the station will act immediately to the maximum capacity to suppress the high voltage of the system.

As shown in Figure 6, the new energy delivery system is the second channel of Xinjiang and the Northwest main grid network, wind power and solar energy are sent out through the network channel, and FACTS equipment is installed on the network channel; among them, the Shazhou station along the network channel Install a 66kV static var compensator on the side of the third winding of the main transformer, install a magnetically controlled busbar with controllable high-resistance on the side of the Yuka busbar in the switch station, and install a graded adjustable bus on both sides of the Shazhou-Yuka line double-circuit line. Control high resistance.

Based on the BPA power flow calculation program, the simulation calculation of the control strategy is carried out, and the control effect of the proposed coordinated control strategy for the multi-FACTS equipment of the second channel of the Xinjiang and Northwest Network on the voltage is investigated. The schematic diagram of the second channel networking is shown in FIG. 7 .

First of all, the control effect of the coordination control strategy on the voltage of the second channel multi-FACTS equipment of the main network in Xinjiang and the Northwest main network is investigated. The calculation example uses the planning data in the summer of 2013. Set the control voltage target values V ₁ = 775kV, V ₂ = 770kV for Shazhou station and Yuka station, the Shazhou bus voltage control zone is [770kV, 780kV], and the Yuka bus voltage control zone is [765kV, 775kV]. Considering that the wind power in Dunhuang and Jiuquan fluctuates uniformly from 0MW to 3300MW, every 300MW, Qinghai sea power peak regulation is used to maintain the power balance of the system when the wind power fluctuates. In the simulation, when the initial output of wind power is 0MW, the FACTS equipment of the second channel is arranged to generate the maximum inductive reactive power, that is, the controllable high-resistance of the four groups of lines from Shazhou to Yuka is arranged at the maximum capacity of 390Mvar, and the SVC of Shazhou Station is arranged at the maximum inductive capacity of 360Mvar , The controllable high-resistance arrangement of the magnetically controlled busbar at the fish card station is arranged at a maximum capacity of 330Mvar, the inductance is "+", and the capacitance is "-". According to the inner layer control strategy, the controllable high-resistance actions of the two groups of lines inside the Shazhou station are shown in Figure 7, and the controllable high-resistance actions of the two groups of lines inside the Yuka station are shown in Figure 8, and the SVC of the Shazhou station The action is shown in Figure 9, and the controllable high-resistance action of the magnetically controlled bus at the fish card station is shown in Figure 10. The voltage changes on the 750kV side of Shazhou Station and Yuka Station are shown in Figure 11. It can be seen from the figure that the controllable high resistance 1 and controllable high resistance 2 alternate actions of the Shazhou line, the controllable high resistance 1 and the controllable high resistance 2 alternate actions of the fish card, and the controllable high resistance only moves one level at a time . When the controllable high reactance is activated, the controllable high reactance of Shazhou SVC and Yuka magnetically controlled bus will be adjusted in reverse to control the voltage at the target value. In Fig. 9, when the wind power output is 2400MW, 3000MW and 3300MW, the SVC reversely adjusts. In Fig. 10, when the wind power output is 1800MW and 2400MW, the controllable high-resistance of the magnetically controlled busbar is reversely adjusted.

When the wind power output is 0MW~1500MW, the voltage of Shazhou Station and Yuka Station can be controlled at the target value only by relying on the controllable high-resistance follow-up voltage regulation of the SVC of Shazhou Station and the magnetically controlled busbar of Yuka Station. When the wind power output is 1800MW, the voltage in Shazhou is within the control range, and the voltage of the fish card is lower than 765kV, a group of fish cards can control the high resistance to operate at the first level. When the wind power output is 2100MW and 2700MW, the controllable high-resistance of a group of lines in Shazhou operates at the first level, and the voltage of Shazhou and Yuka can be restored to the control range, and the controllable high-resistance of the Yuka line does not need to be activated. When the wind power output is 2400MW and 3300MW, the controllable high-resistance operation of Shazhou is after the first level, but the voltage of the fish card is lower than 765kV, and the controllable high-resistance operation of the fish card is the first level. When the wind power output is 3000MW, the voltage of Shazhou is still lower than 770kV after one group of lines in Shazhou has a controllable high-resistance action of one level, and the other group of lines in Shazhou has a controllable high-resistance action of one level, and the voltage of Shazhou returns to the control range Inside, the voltage of the fish card is still lower than 765kV, and a group of fish cards can control the high resistance to operate at the first level. By adopting the multi-FACTS equipment inner layer coordinated control strategy, the Shazhou voltage can be accurately controlled at 775kV, the fish card voltage can be accurately controlled at 770kV when the wind power fluctuation is 0~2400MW, and the fish card voltage can be controlled at 2700MW~3300MW when the wind power fluctuation is 2700MW~3300MW. [765kV, 770kV] range.

Secondly, the control effect of the outer layer coordination control strategy of multi-FACTS equipment on the second channel of the main network network in Xinjiang and Northwest China is investigated. The calculation example uses the planning data of the summer university in 2013. Set the upper and lower boundaries of the outer layer voltage control as the default value, U ₁ =803kV, U ₂ =745kV. In the simulation, the four groups of controllable high-resistance on both sides of the Shazhou-Yuka line are all invested with a maximum capacity of 390Mvar, the Shazhou SVC capacity is 0Mvar, and the maximum capacity of the controllable high-resistance input of the Yuka magnetically controlled bus is 330Mvar. After the Dunhuang-Jiuquan N-2 fault, the bus voltage changes at Shazhou Station and Yuka Station are shown in Figures 12 and 13. The voltage changes of the stations along the second channel of the Xinjiang-Northwest Interconnection are shown in Table 1 below. After the fault, the voltage in Shazhou was 736kV, and that in Yuka was 709kV. Considering the follow-up voltage regulation function of SVC, the Shazhou voltage returns to 750kV, the fish card voltage returns to 720kV, the fish card voltage is still lower than the outer layer voltage control lower limit of 745kV, the outer layer control is started, and the two groups of lines on the fish card side can control the high resistance Cut off one level, the fish card voltage returns to 734kV, still lower than 745kV, start the next round of outer layer control, the two groups of lines on the fish card side can control the high resistance and then cut off one level, the fish card voltage returns to 748kV.

Table 1

Finally, the control effect of the coordinated control strategy of the outermost layer of multi-FACTS equipment on the second channel of the main network in Xinjiang and Northwest China is investigated. Among them, Dunhuang wind power access 3200MW, Jiuquan wind power access 1000MW. Set the upper boundary of the outermost voltage control as the default value, and take U'=830kV. In the simulation, the SVC capacity in Shazhou is 0Mvar, and the four groups of controllable high resistance on both sides of the Shazhou-Yuka line have an average input capacity of 156Mvar (fixed capacity 39Mvar+level 1 controllable capacity 117Mvar). The Yumen-Jiayuguan Sanyong N-1 fault on the confluence side of the Jiuquan Wind Farm is set up. After the fault is simulated, the 4200MW wind power in Gansu is all disconnected from the grid. The voltage changes at Shazhou Station and Yuka Station are shown in Figure 14 and Figure 15. After the wind power is disconnected from the grid, the maximum voltage of Shazhou and Yuka is still above 830kV considering the function of SVC to follow the voltage regulation. The outermost control strategy is activated, and the controllable high resistance of the two lines of Shazhou Station and Yuka Station are both turned on to the maximum. Capacity 390Mvar. After the controllable high-resistance operation, the voltage can be restored to a reasonable range, the Shazhou voltage has recovered to 790kV, and the Yuka voltage has recovered to 790kV. The voltage changes of each station after the off-grid fault caused by the action of the dynamic reactive power compensation equipment are shown in Table 2 below.

Table 2

Voltage/(kV) Dunhuang Jiuquan Shazhou fish card Qaidam initial 768 770 782 787 780 After the wind power off-grid, the SVC and the controllable high resistance will not operate 830 810 840 850 845 After the wind power goes off-grid, only SVC operates 815 800 820 835 835 After the wind power off-grid, the SVC and the controllable high resistance both operate 790 790 790 790 800

Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: the present invention can still be Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention shall be covered by the scope of the claims of the present invention.

Claims (6)

1. a FACTS equipment coordination control method for new forms of energy delivery system, is characterized in that: described method comprises internal layer control, outer control and outermost layer and controls; Described internal layer controls transformer substation voltage accurately to control in voltage-target or voltage control band; When large disturbances appears in new forms of energy delivery system, outer control and outermost layer control to provide urgent reactive power support, and transformer substation voltage is returned to rapidly in allowed band;

Described new forms of energy delivery system is Xinjiang and northwest Major Networks second channel, and wind-powered electricity generation and solar energy are sent outside by passage of networking, and described networking passage installs FACTS equipment; Wherein, become tertiary winding side installing 66kV Static Var Compensator the husky state station owner that networking passage is along the line, at fish card station, bus bar side installs the controlled high resistance of magnet controlled bus, in Sha Zhou ~ controlled high resistance of fish card double-circuit line both sides installing stagewise;

Described skin controls to stand busbar voltage for input variable with shoal station/fish card, input outer voltage coboundary U1 and outer voltage lower boundary U2, outer voltage coboundary U1 and outer voltage lower boundary U2 and determined by user; Outer control Real-Time Monitoring voltage, when occurring large disturbance in new forms of energy delivery system, continuous 5s monitors busbar voltage at [U2, U1] outside, now dynamic adjustments is complete within the monitoring time of 5s for Static Var Compensator and the controlled high resistance of magnet controlled bus, reach its maximum/minimum capacity, now shoal station/fish card station controlled high resistance I of internal classification formula and the controlled high resistance II of stagewise are excised simultaneously or drop into a level capacity, then start to circulate timing next time;

When generating region internal fault, i.e. husky state ~ fish card line fault, then preferential electro-magnetic transient controls; If within the monitoring time of 5s, shoal station/fish card station tuning controller and the controlled high resistance of stagewise receive husky state ~ fish card circuit relay and protect outlet signal or circuit breaker position contact point signal, then locking skin controls, start electro-magnetic transient control strategy, controlled for both sides stagewise high resistance is thrown to heap(ed) capacity, after electro-magnetic transient control terminates, go back to outer control.

2. the FACTS equipment coordination control method of new forms of energy delivery system according to claim 1, is characterized in that: during described internal layer controls, internal layer voltage control was every 1 minute circulation primary; Sha Zhouzhan and fish card station internal layer control to arrange time delay 30s, to avoid Sha Zhouzhan and the action simultaneously of the controlled high resistance of fish card station track road stagewise.

3. the FACTS equipment coordination control method of new forms of energy delivery system according to claim 2, is characterized in that: described internal layer voltage control for input variable, inputs station, husky state control voltage desired value V with shoal station/fish card station busbar voltage ₁, fish card station control voltage desired value V ₂, station, husky state busbar voltage control cincture [V ₁-Δ V ₁, V ₁+ Δ V ₁] and fish card station busbar voltage control cincture [V ₂-Δ V ₂, V ₂+ Δ V ₂], Δ V ₁with Δ V ₂be respectively the busbar voltage deviation of Sha Zhouzhan and the station permission of fish card, V ₁, V ₂, Δ V ₁with Δ V ₂numerical value determined by user.

4. the FACTS equipment coordination control method of new forms of energy delivery system according to claim 3, it is characterized in that: during internal layer voltage control, the trailing type regulating action of preferential performance Static Var Compensator, the controlled high resistance of magnet controlled bus, controls at V respectively by husky state station busbar voltage and fish card station busbar voltage ₁and V ₂; When Static Var Compensator, magnet controlled controlled high resistance have reached maximum/minimum capacity, Sha Zhouzhan/fish card station busbar voltage is not still in Sha Zhouzhan/fish card station busbar voltage control cincture, and now station, husky state/fish blocks the controlled high resistance trigger action of stagewise in station; For reducing equipment loss, when controlled high resistance controls to trigger, the controlled high resistance I of station, husky state stagewise and II alternating movement, the controlled high resistance I of fish card station track road stagewise and II alternating movement, each action one-level;

When after Sha Zhouzhan/one group, fish card station stagewise controlled high resistance I action one-level, if monitoring busbar voltage is not still when allowing in voltage control band, then send out triggering command to the controlled high resistance II of another group stagewise of our station, stagewise controlled high resistance II action one-level, if now stagewise controlled high resistance II fault or reached maximum/minimum capacity, then send out triggering command to the controlled high resistance I of stagewise, the controlled high resistance I of stagewise action one-level again;

When Sha Zhouzhan/one group, fish card station controlled high resistance I of stagewise needs action, but due to stagewise controlled high resistance I faults itself or reached maximum/minimum capacity, then send out triggering command to the controlled high resistance II of another group stagewise of our station, stagewise controlled high resistance II action one-level, after stagewise controlled high resistance II action one-level, if monitoring busbar voltage is not still when allowing in voltage control band, then the controlled high resistance II of stagewise needs action one-level again.

5. the FACTS equipment coordination control method of new forms of energy delivery system according to claim 1, it is characterized in that: described outermost layer voltage control stands busbar voltage for input variable with Sha Zhouzhan/fish card, input outermost layer voltage control upper limit U', the numerical value of U' is determined by user; Outermost layer voltage control real-time monitoring system voltage, once monitor voltage higher than two groups of controlled high resistances of stagewise action immediately in U', Sha Zhouzhan/fish card station to heap(ed) capacity, to suppress system high pressure.

6. the FACTS equipment coordination control method of new forms of energy delivery system according to claim 1, is characterized in that: described outermost layer controls priority and controls higher than skin, and the outer priority that controls controls higher than internal layer.