A power supply control device with dynamic response optimization

Abstract

A power control device with dynamic response optimization proposes a steady-state three-domain and transient two-domain control strategy based on the separation of MEA and BCM control loop time constants based on the three-domain control based on MEA and BCM control loops. The MEA control loop outputs a signal V MEA Linearly related to the BDR output current, the BCM control loop output signal I BAT‑BCM‑REF The control loop linearly related to the BCR charging current is decoupled, reducing the cross-domain dead zone, thereby optimizing the cross-domain dynamic response. MEA Signal pair I BAT‑BCM‑REF The long time constant control of the signal realizes the separation of the time constants of the steady-state and transient control of the BCR charging current. Therefore, the BCR charging current changes with the energy demand while V MEA Signal maintains V MEA‑BCM‑REF unchanged, ensuring the consistency of transconductance control in the entire discharge domain.

Description

Technical Field

[0001] The invention relates to a power supply control device with dynamic response optimization, and belongs to the field of satellite power supply and distribution technology design. Background Art

[0002] The power control device is used to complete the regulation of the power of the entire satellite from ground testing, launch, transfer orbit to fixed point. The energy generated by the solar array during the illumination period will be regulated by the sequential switching shunt regulator module (S3R) and then transmitted to the bus. The battery charge regulator module (BCR) stores part of the energy on the bus in the battery pack. During the earth shadow period or when the output power of the solar array is insufficient, it is released to the bus through the battery discharge regulator module (BDR), providing a stable bus for the entire satellite.

[0003] The power control device of the traditional satellite using solar array and battery as energy usually adopts the three-domain control method, as described in "Research on Low Output Impedance, High Efficiency and High Dynamic Response Satellite Power Controller" by Bao Zhiyun of Harbin Institute of Technology, when the main error amplifier signal (MEA) is in the BDR domain, the battery provides energy to the bus through BDR discharge, and the BDR works to stabilize the bus; when the MEA is in the BCR domain, the solar array is insufficient to provide the sum of the load power demand and the charging power of the given battery, and the BCR works to stabilize the bus; when the MEA is in the S3R domain, the solar array fully meets the load power demand and the sum of the charging power of the given battery, and the S3R works to stabilize the bus. This three-domain control method causes the power control device to have a large spike of bus voltage drop or overshoot when crossing domains due to the dead zone between domains and the direct cross-domain working conditions between the BDR domain and the S3R domain.

[0004] The patent "A Power Controller PCU Two-Domain Low Ripple Control Method" (CN201710961689.8) proposes a power controller two-domain control method, which merges the BCR domain and the BDR domain. In the upper part of the BDR domain, each MEA value linearly corresponds to a unique BCR output current and BDR input current. The advantage of this two-domain control method is that it reduces the dead zone and improves the dynamic response performance, but the problem is that this solution will cause the transconductance of the part with charging current and the part without charging current in the BDR domain to differ by one time, which limits the dynamic response speed in the BDR domain, and the transconductance will change with the battery voltage, increasing the complexity of system reliability analysis. Summary of the invention

[0005] The technical problem solved by the present invention is: in view of the problem that the dynamic response speed of the three-domain control and other two-domain control methods of the traditional satellite power control device in the existing technology is insufficient, a power control device with dynamic response optimization is proposed.

[0006] The present invention solves the above technical problems by the following technical solutions:

[0007] A power supply control device with dynamic response optimization is used for power control of a solar cell array and a storage battery, comprising an S3R module, a BCR module and a BDR module. The S3R module, the BCR module and the BDR module are connected via a power bus. During the illumination period, the solar cell array is regulated by the S3R module and then transmits energy to the power bus to supply energy to the satellite. The BCR module stores the energy transmitted by the power bus in a storage battery group. When the solar cell array is in the earth's shadow or the output power is insufficient, the BDR module releases the energy stored in the storage battery group to the power bus to supply energy to the satellite.

[0008] It also includes a central control module, which controls the S3R module, the BCR module, and the BDR module, and cooperates with the S3R module and the BCR module to charge the battery or cooperates with the BDR module to discharge the battery to supply energy to the satellite.

[0009] The central control module includes an MEA unit and a BCM unit, and adopts a steady-state three-domain and transient two-domain control strategy. When the power control device is in a steady-state working state, the central control module performs steady-state three-domain control, wherein:

[0010] The MEA unit receives the bus voltage sampling signal generated by the S3R module and generates the MEA signal V MEA , V MEA Divided into SUN domain, BCR and BDR mixed domain, and BDR domain;

[0011] The MEA signal corresponding to the SUN domain is the lower limit value of the SUN domain V MEA-SUN-LOW ~SUN domain upper limit value V MEA-SUN-HIGH , the MEA signal corresponding to the mixed domain of BCR and BDR is the lower limit value of the mixed domain V MEA-BCM-REF ~Mixed domain upper limit V MEA-BDR-HIGH , the MEA signal corresponding to the BDR domain is the lower limit value of the BDR domain V MEA-BDR-LOW ~BDR domain upper limit value V MEA-BCM-REF ,in:

[0012] When the MEA signal V MEA When in the SUN domain, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. The S3R module outputs the current I according to the received MEA signal. S3R-BUS Transmitted to the power bus, the current value is VMEA Linear correlation, in the current domain, the MEA signal received by the BDR module exceeds the upper threshold V of the BDR module MEA-BDR-HIGH , output current I BDR-BUS is 0, the BCM unit receives the preset charging current I BAT-REF After calculation and processing, the preset charging current reference signal I of the BCR module is generated BAT-BCM-REF , and transmit it to the BCR module, the BCR module charges according to the preset current I BAT-REF Charge the battery;

[0013] When the MEA signal V MEA When in the mixed domain of BCR and BDR, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. In the current domain, the MEA signal received by the S3R module exceeds the lower limit of the S3R module threshold V MEA-SUN-LOW , output bus voltage V bus The maximum output current of the S3R module is SA-MAX , the BDR module outputs current I according to the received MEA signal BDR-BUS Transmitted to the power bus, the current value is V MEA Linearly related, the BCM unit receives the MEA signal V MEA Generates the charging current reference signal I of the BCR module BAT-BCM-REF , and transmit it to the BCR module, and the BCR module follows I BAT-BCM-REF To charge the battery, where:

[0014] BCM unit according to V MEA The charging current reference signal I generated by the BCR module BAT-BCM-REF No linear relationship with the received MEA signal;

[0015] When the MEA signal V MEA When in the BDR domain, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. In the current domain, the MEA signal received by the S3R module exceeds the lower limit of the S3R module threshold V MEA-SUN-LOW , output bus voltage V bus The maximum output current of the S3R module is SA-MAX , the BDR module outputs current I according to the received MEA signal BDR-BUS Transmitted to the power bus, the current value is V MEA Linearly related, the BCM unit receives the MEA signal V MEA The charging current value of the generated current signal is 0.

[0016] When the power control device is in transient working state, the central control module embodies transient two-domain control, where:

[0017] The MEA unit receives the bus voltage sampling signal generated by the S3R module and generates the MEA signal V MEA , V MEA Divided into SUN domain and BDR domain;

[0018] V MEA-SUN-LOW ~V MEA-SUN-HIGH 、V MEA-BDR-LOW ~V MEA-BDR-HIGH ,in:

[0019] When the MEA signal V MEA When the SUN domain is in transient state, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. The S3R module outputs a current I that changes linearly with the MEA signal. S3R-BUS Transmitted to the power bus, the MEA signal received by the BDR module in the current domain exceeds the upper threshold V of the BDR module MEA-BDR-HIGH , output current I BDR-BUS is 0, the BCM unit receives the preset charging current I BAT-REF After calculation, the preset charging current reference signal I of the BCR module is generated BAT-BCM-REF , and transmit it to the BCR module, the BCR module charges according to the preset current I BAT-REF Charge the battery;

[0020] When the MEA signal V MEA When the transient state changes in the BDR domain, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. In the current domain, the MEA signal received by the S3R module exceeds the lower limit of the S3R module threshold V MEA-SUN-LOW , output bus voltage V bus The maximum output current of the S3R module is SA-MAX , the BDR module outputs a current I that changes linearly with the MEA signal BDR-BUS Transmitted to the power bus, the current signal I generated by the BCM unit closed-loop control BAT-BCM-REF With MEA signal V MEA change;

[0021] When the MEA signal V MEA When the transient state changes between the SUN domain and the BDR domain, the MEA unit sends the MEA signal to the S3R module, the BDR module, and the BCM unit. The S3R module and the BDR module respectively output the current I that changes linearly with the MEA signal. S3R-BUS ,I BDR-BUS Transmitted to the power bus, the current signal I generated by the BCM unit closed-loop control BAT-BCM-REF With MEA signal V MEA change.

[0022] In the MEA unit, after receiving the bus voltage sampling signal generated by the S3R module, the bus voltage sampling value V is acquired. bus , bus voltage reference value Vref, make a difference and obtain MEA signal V through PI control MEA .

[0023] In the BCM unit, upon receiving the MEA signal, V MEA V MEA-BCM-REF Compare the difference, and output it with I after PI control BAT-REF Compare and take the smaller value to obtain the charging current reference signal I of the BCR module BAT-BCM-REF .

[0024] The PI control can be replaced by a closed-loop control method such as integral control or predictive control, and the closed-loop control time constant is much larger than the time constant of the MEA closed-loop control.

[0025] When the power control device is in steady-state operation, the MEA signal V MEA In the SUN domain:

[0026] V MEA-SUN-LOW ≤V MEA ≤V MEA-SUN-HIGH

[0027] I S3R-BUS =G SUN ×(V MEA -V MEA-SUN-LOW )

[0028] I cout =I BAT-REF

[0029] I dout =0

[0030] In the formula, G SUN is the transconductance of the S3R module, which is determined by the hysteresis control parameters of the S3R module, V BAT is the battery output voltage, I cout is the output current value of the BCR module, I dout is the output current value of the BDR module.

[0031] When the power control device is in steady-state operation, the MEA signal V MEA In a mixed BCR and BDR domain:

[0032] V MEA-BCM-REF ≤V MEA <V MEA-BDR-HIGH

[0033] I dout =G BDR ×(VMEA-BDR-HIGH -V MEA )

[0034] I cout =I BAT-REF

[0035] I S3R-BUS =I SAmax

[0036]

[0037] In the formula, I BDRmax is the maximum output current of the BDR module, I SAmax is the bus voltage V bus The maximum output current of the lower S3R module;

[0038] When V MEA =V MEA-BCM-REF When the output current of the BDR module is V MEA-BCM-REF , the output current range of the BCR module is 0 to I BAT-REF , determined according to the satellite load power requirement, where:

[0039] V MEA =V MEA-BCM-REF

[0040] I dout =G BDR ×(V MEA-BCM-REF -V MEA )

[0041] I S3R-BUS =I SAmax

[0042] I BCR-BUS =I S3R-BUS -I LOAD +I dout

[0043] In the formula, I LOAD is the bus load current value.

[0044] When the power control device is in steady-state operation, the MEA signal V MEA When in the BDR domain, the BDR module output current value varies with V MEA The value changes linearly:

[0045]

[0046] The advantages of the present invention compared with the prior art are:

[0047] The present invention provides a power supply control device with optimized dynamic response, which realizes steady-state three-domain and transient two-domain control strategies through independent control of time constant separation of MEA control loop and BCM control loop. Compared with the traditional design method, the cross-domain dead zone is reduced through decoupling control of MEA control loop and BCM control loop, thereby greatly optimizing the cross-domain dynamic response; the consistency of transconductance control in the entire discharge domain is ensured by separating the time constants of steady-state and transient control of BCR charging current. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 A schematic diagram of the division of the MEA control domain provided for the invention;

[0049] Figure 2 A schematic diagram of the hardware provided for the invention;

[0050] Figure 3 Schematic diagram of the steady-state three-domain and transient two-domain control strategy provided for the invention;

[0051] Figure 4 Schematic diagram of the current position and direction of the BCR module and BDR module provided for the invention;

[0052] Figure 5 A schematic diagram of cross-domain dynamic response simulation of the steady-state three-domain and transient two-domain control strategies provided for the invention;

[0053] Figure 6 Schematic diagram of cross-domain dynamic response simulation of the traditional three-domain control strategy provided for the invention. DETAILED DESCRIPTION

[0054] A power supply control device with dynamic response optimization can overcome the problem of insufficient dynamic response speed of three-domain control and other two-domain control methods of traditional satellite power supply control devices, mainly including S3R module, BCR module, BDR module and central control module, wherein:

[0055] The S3R module, BCR module, and BDR module are connected through a power bus. During the illumination period, the solar array is regulated by the S3R module and then transmits energy to the power bus to power the satellite. The BCR module stores the energy transmitted by the power bus in the battery pack. When the solar array is in the earth's shadow or the output power is insufficient, the BDR module releases the energy stored in the battery pack to the power bus to power the satellite. The central control module controls the S3R module, BCR module, and BDR module, and cooperates with the S3R module and BCR module to charge the battery or cooperates with the BDR module to discharge the battery to power the satellite.

[0056] The central control module includes the MEA unit and the BCM unit, and adopts a steady-state three-domain and transient two-domain control strategy. When the power control device is in a steady-state working state, the central control module embodies a steady-state three-domain control, in which:

[0057] The MEA unit receives the bus voltage sampling signal of the S3R module and generates the MEA signal V MEA , V MEA Divided into SUN domain, BCR and BDR mixed domain, and BDR domain;

[0058] V MEA-SUN-LOW ~V MEA-SUN-HIGH 、V MEA-BCM-REF ~V MEA-BDR-HIGH 、V MEA-BDR-LOW ~V MEA-BCM-REF ,in:

[0059] When the MEA signal V MEA When in the SUN domain, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. The S3R module outputs the current I according to the received MEA signal. S3R-BUS Transmitted to the power bus, this current is related to V MEA Linear correlation, the MEA signal received by the BDR module exceeds the upper threshold V of the BDR module MEA-BDR-HIGH , output current I BDR-BUS is 0, the BCM unit receives the preset charging current I BAT-REF After calculation, the preset charging current reference signal I of the BCR module is generated BAT-BCM-REF , and transmit it to the BCR module, the BCR module charges according to the preset current I BAT-REF Charge the battery;

[0060] When the MEA signal V MEA When in the mixed domain of BCR and BDR, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. The MEA signal received by the S3R module exceeds the lower limit of the S3R module threshold V MEA-SUN-LOW , output bus voltage V bus The maximum output current of the S3R module is SA-MAX , the BDR module outputs current I according to the received MEA signal BDR-BUS Transmitted to the power bus, this current is related to V MEA Linearly related, the BCM unit receives the MEA signal V MEA Generates the charging current reference signal I of the BCR module BAT-BCM-REF , and transmit it to the BCR module, and the BCR module follows I BAT-BCM-REF To charge the battery, in particular, the BCM unit charges the battery according to V MEAThe charging current reference signal I generated by the BCR module BAT-BCM-REF There is no linear relationship with the received MEA signal. Instead, the BCM unit responds to V MEA Generated I BAT-BCM-REF To maintain the MEA signal at V MEA-BCM-REF constant;

[0061] When the MEA signal V MEA When in the BDR domain, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. The MEA signal received by the S3R module exceeds the lower threshold of the S3R module V MEA-SUN-LOW , output bus voltage V bus The maximum output current of the S3R module is SA-MAX , the BDR module outputs current I according to the received MEA signal BDR-BUS Transmitted to the power bus, this current is related to V MEA Linearly related, the BCM unit receives the MEA signal V MEA The charging current value of the generated current signal is 0.

[0062] When the power control device is in transient working state, the central control module embodies transient two-domain control, where:

[0063] The MEA unit receives the bus voltage sampling signal of the S3R module and generates the MEA signal V MEA , V MEA Divided into SUN domain and BDR domain;

[0064] V MEA-SUN-LOW ~V MEA-SUN-HIGH 、V MEA-BDR-LOW ~V MEA-BDR-HIGH ,in:

[0065] When the MEA signal V MEA When the SUN domain is in transient state, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. The S3R module outputs a current I that changes linearly with the MEA signal. S3R-BUS Transmitted to the power bus, the MEA signal received by the BDR module exceeds the upper threshold of the BDR module V MEA-BDR-HIGH , output current I BDR-BUS is 0, the BCM unit receives the preset charging current I BAT-REF After calculation, the preset charging current reference signal I of the BCR module is generated BAT-BCM-REF , and transmit it to the BCR module, the BCR module charges according to the preset current I BAT-REF To charge the battery; when the MEA signal V MEAWhen the transient state changes in the BDR domain, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. The MEA signal received by the S3R module exceeds the lower limit of the S3R module threshold V MEA-SUN-LOW , output bus voltage V bus The maximum output current of the S3R module is SA-MAX , the BDR module outputs a current I that changes linearly with the MEA signal BDR-BUS Transmitted to the power bus, the current signal I generated by the BCM unit closed-loop control BAT-BCM-REF With MEA signal V MEA Slowly changing, the time constant is much larger than the time constant of MEA unit control.

[0066] When the MEA signal V MEA When the transient state changes between the SUN domain and the BDR domain, the MEA unit sends the MEA signal to the S3R module, the BDR module, and the BCM unit. The S3R module and the BDR module respectively output the current I that changes linearly with the MEA signal. S3R-BUS ,I BDR-BUS Transmitted to the power bus, the current signal I generated by the BCM unit closed-loop control BAT-BCM-REF With MEA signal V MEA Slowly changing, the time constant is much larger than the time constant of MEA unit control.

[0067] In the MEA unit, after receiving the bus voltage sampling signal of the S3R module, the bus voltage sampling value V is acquired. bus , bus voltage reference value Vref, make a difference and obtain MEA signal V through PI control MEA ;

[0068] In the BCM unit, when receiving the MEA signal, V MEA V MEA-BCM-REF Compare the difference, and output it with I after PI control BAT-REF Compare and take the smaller value to obtain the charging current reference signal I of the BCR module BAT-BCM-REF .

[0069] PI control can be replaced by integral control and predictive control type closed-loop control methods. The closed-loop control time constant is much larger than the time constant of MEA closed-loop control.

[0070] When the power control device is in steady-state operation, the MEA signal V MEA In the SUN domain:

[0071] V MEA-SUN-LOW ≤V MEA ≤V MEA-SUN-HIGH

[0072] I S3R-BUS=G SUN ×(V MEA -V MEA-SUN-LOW )

[0073] I cout =I BAT-REF

[0074] I dout =0

[0075] In the formula, G SUN is the transconductance of the S3R module, which is determined by the hysteresis control parameters of the S3R module, V BAT is the battery output voltage, I cout is the output current value of the BCR module, I dout is the output current value of the BDR module;

[0076] When the power control device is in steady-state operation, the MEA signal V MEA In a mixed BCR and BDR domain:

[0077] V MEA-BCM-REF ≤V MEA <V MEA-BDR-HIGH

[0078] I dout =G BDR ×(V MEA-BDR-HIGH -V MEA )

[0079] I cout =I BAT-REF

[0080] I S3R-BUS =I SAmax

[0081]

[0082] In the formula, I BDRmax is the maximum output current of the BDR module, I SAmax is the bus voltage V bus The maximum output current of the lower S3R module;

[0083] The output current of the BDR module is V MEA-BCM-REF , the output current range of the BCR module is 0 to I BAT-REF , determined according to the satellite load power requirement, where:

[0084] V MEA-BCM-REF ≤V MEA <V MEA-BDR-HIGH

[0085] I dout =G BDR ×(VMEA-BDR-HIGH -V MEA )

[0086] I cout =I BAT-REF

[0087] I S3R-BUS =I SAmax

[0088] In the formula, I LOAD is the bus load current value;

[0089] When the power control device is in steady-state operation, the MEA signal V MEA When in the BDR domain, the BDR module output current value varies with V MEA The value changes linearly:

[0090] V MEA-BDR-LOW ≤V MEA <V MEA-BCM-REF

[0091] I dout =G BDR ×(V MEA-BDR-HIGH -V MEA )

[0092] I cout =0

[0093] I S3R-BUS =I SAmax

[0094] The following is further described based on specific embodiments:

[0095] In the current embodiment, the power control device is as follows Figure 2 As shown in the figure, they are hardware composition and power signal flow diagrams, respectively. The control device includes S3R module, BCR module, BDR module, and central control module, wherein the central control module contains MEA unit and battery charge management (BCM) unit, which is the core hardware for realizing the control strategy of steady-state three domains and transient two domains. S3R module, BCR module, and BDR module are connected through power bus, and the power signal of each module is transmitted to the central control module after sampling. After the operation of MEA unit and BCM unit, the control signal is generated as the input signal of the output current closed-loop control of S3R module, BCR module, and BDR module. The number of various modules contained in the power control device can be flexibly configured according to the power demand.

[0096] The core technical solution of the power supply control device is: the bus voltage sampling signal is controlled by the MEA unit to obtain the MEA signal V MEA , V MEAThe current I is transmitted to the S3R module and the BDR module, and after conditioning, it is controlled through a closed loop to provide a current I S3R-BUS and I BDR-BUS ; V MEA Through the BCM unit, the battery charging current is obtained to obtain the reference value I of the actual BCR module charging closed-loop control charging current BAT-BCM-REF , is transmitted to the BCR module, and after conditioning, it provides current through closed-loop control, such as Figure 3 shown.

[0097] Among them, the implementation method of the MEA unit is: the bus voltage sampling value V bus The difference between the bus voltage reference value Vref is made, and the MEA signal V is controlled by PI (or other closed-loop control methods). MEA .

[0098] The BCM unit is implemented as follows: V MEA With a constant value V in a given BDR domain MEA-BCM-REF By comparison, through the closed-loop control of PI or integral link, its output is consistent with the given charging current I BAT-REF Take the smaller value and get the reference value I of the actual BCR module charging closed-loop control charging current BAT-BCM-REF , where the closed-loop control time constant in this link is much smaller than the time constant of MEA closed-loop control.

[0099] The control strategy of steady-state three domains and transient two domains, such as Figure 1 As shown, when the power control device is working in a steady state, the MEA value is divided into three regions: S3R region, BDR region and mixed region; when it is working in a transient state, the MEA value is divided into two regions: S3R region and BDR region, which ensures both the power balance of the steady state and the dynamic performance of the transient state.

[0100] The steady-state three-domain working mode is: the SUN domain S3R is in the shunt regulation state, and the BCR is set according to the set current I BAT-REF Charge the battery pack; the hybrid domain BCR and BDR work simultaneously, BCR charges the battery, BDR discharges to the bus load, and there is a circulating current; the charging current in the BDR domain is 0, and the BDR works alone or the S3R and BDR work together to supply power to the load.

[0101] Specifically:

[0102] V MEA-SUN-LOW ~V MEA-SUN-HIGH In the SUN domain, S3R is in the shunt regulation state, and BCR is set according to the set current I BAT-REF Charge the battery pack; V MEA-BCM-REF ~V MEA-BDR-HIGHIt is a mixed domain of BCR and BDR. At this time, BCR and BDR work at the same time. BCR charges the battery and BDR discharges to the bus load, and there is a circulating current. V MEA-BDR-LOW ~V MEA-BCM-REF It is the BDR domain, in which the charging current is 0, and the BDR works alone or the S3R and BDR work together to supply power to the load, where the BDR output current changes linearly with the MEA value.

[0103] The transient two-domain working mode is: SUN domain S3R acts to respond to dynamic changes of the system; BDR domain BDR acts to respond to dynamic changes of the system; BCR does not participate in the transient response of the power control device during the transient process.

[0104] Specifically:

[0105] V MEA-SUN-LOW ~V MEA-SUN-HIGH For the SUN domain, at this time, S3R acts to respond to the dynamic changes of the system; V MEA-BDR-LOW ~V MEA-BDR-HIGH It is the BDR domain. At this time, the BDR acts to respond to the dynamic changes of the system. During the entire dynamic response process, the response time constant of BCR to MEA is much smaller than that of S3R and BDR. Therefore, BCR does not participate in stabilizing the bus voltage during the transient process.

[0106] Among them, V MEA The conditioning calculation after passing it to the S3R module is:

[0107] I S3R-BUS =G SUN ×(V MEA -V MEA-SUN-LOW )

[0108] V MEA The conditioning calculation after passing it to the BDR module is:

[0109] I dout =G BDR ×(V MEA-BDR-HIGH -V MEA ).

[0110] like Figure 4 The current name and positive direction definition shown in the figure, the steady-state three-domain working process of the power control device has the following characteristics:

[0111] (a) SUN domain: S3R is in the shunt regulation state, and BCR follows the set current I BAT-REF To charge the battery pack, the discharge current is 0;

[0112] V MEA-SUN-LOW ≤V MEA ≤V MEA-SUN-HIGH

[0113] I S3R-BUS =G SUN ×(V MEA -V MEA-SUN-LOW )

[0114] I cout =I BAT-REF

[0115] I dout =0

[0116] in,

[0117] G SUN is the transconductance of the S3R module, which is determined by the hysteresis control of the S3R module.

[0118] V BAT is the battery output voltage,

[0119] I cout is the BCR output current value,

[0120] I dout is the output current value of the BDR module

[0121] (b) Hybrid domain:

[0122] BCR according to the set current I BAT-REF To charge the battery pack, the BDR discharge current changes linearly with the MEA value. At this time, the bus-side circulating current is the BDR output current.

[0123] V MEA-BCM-REF ≤V MEA <V MEA-BDR-HIGH

[0124] I dout =G BDR ×(V MEA-BDR-HIGH -V MEA )

[0125] I cout =I BAT-REF

[0126] I S3R-BUS =I SAmax

[0127]

[0128] In the formula, I BDRmax is the maximum output current of the BDR module, I SAmax is the bus voltage V bus When S3R is fully powered, the maximum current provided by the solar array and the BDR output current are V MEA-BCM-REFThe corresponding output current, BCR output current according to the solar array and load power requirements, from 0 to the set charging current I BAT-REF The circulating current on the bus side is the BCR input current:

[0129]

[0130] (c) BDR domain: In this region, the charging current is 0, and the BDR works alone or the S3R and BDR work together to supply power to the load, where the BDR output current changes linearly with the MEA value.

[0131]

[0132] The power control device realizes the steady-state three-domain and transient two-domain control strategy through independent control of the MEA control loop and the BCM control loop time constant separation, which greatly optimizes the cross-domain dynamic response compared with the traditional design method. Figure 5 As shown in the figure, it is a schematic diagram of the cross-domain dynamic response of the steady-state three-domain and transient two-domain control method. Figure 6 As shown, it is a cross-domain dynamic response comparison diagram of the traditional three-domain control method. Among them, the load current step is 28.8A, the bus voltage spike of the traditional three-domain control method is 3.6Vpp, and the bus voltage spike of the control method described in this article is reduced to 1.6Vpp.

[0133] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

[0134] The contents not described in detail in the specification of the present invention belong to the common knowledge of those skilled in the art.

Claims

1. A power supply control device with dynamic response optimization, characterized in that: Used to control the power of solar arrays and batteries, including S3R modules, BCR modules, and BDR modules. The S3R modules, BCR modules, and BDR modules are connected through a power bus. During the illumination period, the solar array is regulated by the S3R module and then transmits energy to the power bus to power the satellite. The BCR module stores the energy transmitted by the power bus in the battery pack. When the solar array is in the shadow of the earth or the output power is insufficient, the BDR module releases the energy stored in the battery pack to the power bus to power the satellite. It is characterized in that: it also includes a central control module, which controls the S3R module, the BCR module, and the BDR module, and cooperates with the S3R module and the BCR module to charge the battery or cooperates with the BDR module to discharge the battery to supply energy to the satellite; It is characterized in that: the central control module includes an MEA unit and a BCM unit, and adopts a steady-state three-domain and transient two-domain control strategy. When the power control device is in a steady-state working state, the central control module performs steady-state three-domain control, wherein: The MEA unit receives the bus voltage sampling signal generated by the S3R module and generates the MEA signal V MEA , V MEA Divided into SUN domain, BCR and BDR mixed domain, and BDR domain; The MEA signal corresponding to the SUN domain is the lower limit value of the SUN domain V MEA-SUN-LOW ~SUN domain upper limit value V MEA-SUN-HIGH , the MEA signal corresponding to the mixed domain of BCR and BDR is the lower limit value of the mixed domain V MEA-BCM-REF ~Mixed domain upper limit V MEA-BDR-HIGH , the MEA signal corresponding to the BDR domain is the lower limit value of the BDR domain V MEA-BDR-LOW ~BDR domain upper limit value V MEA-BCM-REF ,in: When the MEA signal V MEA When in the SUN domain, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. The S3R module outputs the current I according to the received MEA signal. S3R-BUS Transmitted to the power bus, the current value is V MEA Linear correlation, in the current domain, the MEA signal received by the BDR module exceeds the upper threshold V of the BDR module MEA-BDR-HIGH , output current I BDR-BUS is 0, the BCM unit receives the preset charging current I BAT-REF After calculation and processing, the preset charging current reference signal I of the BCR module is generated BAT-BCM-REF , and transmit it to the BCR module, the BCR module charges according to the preset current I BAT-REF Charge the battery; When the MEA signal V MEA When in the mixed domain of BCR and BDR, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. In the current domain, the MEA signal received by the S3R module exceeds the lower limit of the S3R module threshold V MEA-SUN-LOW , output bus voltage V bus The maximum output current of the S3R module is SA-MAX , the BDR module outputs current I according to the received MEA signal BDR-BUS Transmitted to the power bus, the current value is V MEA Linearly related, the BCM unit receives the MEA signal V MEA Generates the charging current reference signal I of the BCR module BAT-BCM-REF , and transmit it to the BCR module, and the BCR module follows I BAT-BCM-REF To charge the battery, where: BCM unit according to V MEA The charging current reference signal I generated by the BCR module BAT-BCM-REF No linear relationship with the received MEA signal; When the MEA signal V MEA When in the BDR domain, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. In the current domain, the MEA signal received by the S3R module exceeds the lower limit of the S3R module threshold V MEA-SUN-LOW , output bus voltage V bus The maximum output current of the S3R module is SA-MAX , the BDR module outputs current I according to the received MEA signal BDR-BUS Transmitted to the power bus, the current value is V MEA Linearly related, the BCM unit receives the MEA signal V MEA The charging current value of the generated current signal is 0.

2. The power supply control device with dynamic response optimization according to claim 1, characterized in that: When the power control device is in transient working state, the central control module embodies transient two-domain control, where: The MEA unit receives the bus voltage sampling signal generated by the S3R module and generates the MEA signal V MEA , V MEA Divided into SUN domain and BDR domain; V MEA-SUN-LOW ~V MEA-SUN-HIGH 、V MEA-BDR-LOW ~V MEA-BDR-HIGH ,in: When the MEA signal V MEA When the SUN domain is in transient state, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. The S3R module outputs a current I that changes linearly with the MEA signal. S3R-BUS Transmitted to the power bus, the MEA signal received by the BDR module in the current domain exceeds the upper threshold V of the BDR module MEA-BDR-HIGH , output current I BDR-BUS is 0, the BCM unit receives the preset charging current I BAT-REF After calculation, the preset charging current reference signal I of the BCR module is generated BAT-BCM-REF , and transmit it to the BCR module, the BCR module charges according to the preset current I BAT-REF Charge the battery; When the MEA signal V MEA When the transient state changes in the BDR domain, the MEA unit sends the MEA signal to the S3R module, BDR module, and BCM unit. In the current domain, the MEA signal received by the S3R module exceeds the lower limit of the S3R module threshold V MEA-SUN-LOW , output bus voltage V bus The maximum output current of the S3R module is SA-MAX , the BDR module outputs a current I that changes linearly with the MEA signal BDR-BUS Transmitted to the power bus, the current signal I generated by the BCM unit closed-loop control BAT-BCM-REF With MEA signal V MEA change; When the MEA signal V MEA When the transient state changes between the SUN domain and the BDR domain, the MEA unit sends the MEA signal to the S3R module, the BDR module, and the BCM unit. The S3R module and the BDR module respectively output the current I that changes linearly with the MEA signal. S3R-BUS ,I BDR-BUS Transmitted to the power bus, the current signal I generated by the BCM unit closed-loop control BAT-BCM-REF With MEA signal V MEA change.

3. A power supply control device with dynamic response optimization according to claim 2, characterized in that: In the MEA unit, after receiving the bus voltage sampling signal generated by the S3R module, the bus voltage sampling value V is acquired. bus , bus voltage reference value Vref, make a difference and obtain MEA signal V through PI control MEA .

4. A power supply control device with dynamic response optimization according to claim 2, characterized in that: In the BCM unit, upon receiving the MEA signal, V MEA V MEA-BCM-REF Compare the difference, and output it with I after PI control BAT-REF Compare and take the smaller value to obtain the charging current reference signal I of the BCR module BAT-BCM-REF .

5. The power supply control device with dynamic response optimization according to claim 4, characterized in that: The PI control can be replaced by a closed-loop control method such as integral control or predictive control, and the closed-loop control time constant is much larger than the time constant of the MEA closed-loop control.

6. A power supply control device with dynamic response optimization according to claim 5, characterized in that: When the power control device is in steady-state operation, the MEA signal V MEA In the SUN domain: In the formula, is the transconductance of the S3R module, which is determined by the hysteresis control parameter of the S3R module. is the battery output voltage, is the output current value of the BCR module, is the output current value of the BDR module.

7. The power supply control device with dynamic response optimization according to claim 6, characterized in that: When the power control device is in steady-state operation, the MEA signal V MEA In a mixed BCR and BDR domain: In the formula, is the maximum output current of the BDR module, is the bus voltage V bus The maximum output current of the lower S3R module; When V MEA =V MEA-BCM-REF When the output current of the BDR module is V MEA-BCM-REF , the output current range of the BCR module is 0 to I BAT-REF , determined according to the satellite load power requirement, where: In the formula, is the bus load current value.

8. The power supply control device with dynamic response optimization according to claim 7, characterized in that: When the power control device is in steady-state operation, the MEA signal V MEA When in the BDR domain, the BDR module output current value varies with V MEA The value changes linearly: 。

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