It do support WPA-PSK/WPA2-PSK when it works as access point.
Just sometimes we can' t connect to wireless network, so we can try WEP Open which can benefit solve connection problem.
You may try WPA-PSK/WPA2-PSK、AES~

2 solutions
Solution 1-Flash DD-WRT your 830 Use WA801NDv1 files for updates, build r19342 read http://www.dd-wrt.com/phpBB2/viewtopic.php?p=695273#695273
Some official firmware of TP-LINK products can be replaced by the third party firmware such as DD-WRT. TP-LINK does not provide technical support
and does not guarantee the performance and stability of third party firmware. Damage to the product as a result of using third party firmware will void the product's warranty.
Solution 2-buy 2 cheap 741 routers, link them wireless vía WDS
set one as router connected vía cable to your ISP MODEM and set the second 741 as Witeless WDS
You will have a exellent Wi-Fi Repeater here is how to WDS your second 741 http://www.tp-link.com/en/article/?faqid=227
You can do it with one only but sometimes one will not do a good Job connecting to your primary router